- Istanbul Technical University, Environmental Engineering Department, Maslak, Istanbul, Turkey
This study investigates the occupational health and safety for a gas meter manufacturing plant. The risk assessment and management study is applied to plastic injection and mounting departments of the factory through quantitative Fine... more
This study investigates the occupational health and safety for a gas meter manufacturing plant. The risk assessment and management study is applied to plastic injection and mounting departments of the factory through quantitative Fine Kinney method and the effect of adopting 5S workplace organization procedure on risk assessment is examined. The risk assessment reveals that there are 17 risks involved; 14 grouped in high risk class (immediate improvement as required action); 2 in significant (measures to be taken as required action) and one in possible risk class (monitoring as required action). Among 14 high risks, 4 can be reduced by 83 % to be grouped under possible class when 5S is applied. One significant risk is observed to be lowered by 78 % and considered as possible risk due to the application of 5S. As a result of either 67 or 50 % reductions in 7 high risks, these risks are converted to be members of significant risk group after 5S implications.
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... 7. Erdemli E, Germirli Babuna F, Gorgun E, Erdogan A, Dulkadiroglu H, Unal K (2005) Water management and wastewater treatment plant ... Unlu M, Yukseler H, Yetis U (2009) Indigo dyeing wastewater reclamation by membrane-based... more
... 7. Erdemli E, Germirli Babuna F, Gorgun E, Erdogan A, Dulkadiroglu H, Unal K (2005) Water management and wastewater treatment plant ... Unlu M, Yukseler H, Yetis U (2009) Indigo dyeing wastewater reclamation by membrane-based filtration and coagulation processes. ...
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The inert soluble COD fraction of a brewery wastewater, in which almost all COD was present in soluble form, was determined under anaerobic conditions by two different methods. The results indicated that the wastewater contained... more
The inert soluble COD fraction of a brewery wastewater, in which almost all COD was present in soluble form, was determined under anaerobic conditions by two different methods. The results indicated that the wastewater contained practically no inert soluble COD. The anaerobic digestion process was found to generate inert soluble microbial byproducts, with a yield of approximately 0.04 kg inert soluble COD kg−1 soluble COD utilised. The two methods applied gave similar results.
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Lignosulphonates are known as biologically-difficult-to-degrade, multi-purpose macromolecules that potentially may create toxicity problems in biological activated sludge treatment systems and/or in receiving water bodies. In the present... more
Lignosulphonates are known as biologically-difficult-to-degrade, multi-purpose macromolecules that potentially may create toxicity problems in biological activated sludge treatment systems and/or in receiving water bodies. In the present experimental work a commercial lignosulfonate formulation (COD = 320 mg/g; BOD5 = 8 mg/g) frequently being used as an auxiliarly chemical in the cotton and polyester dyeing process was subjected to ozonation (≈ 3 g O3/CODo) at different pH (6 and 12) and ozone doses (1,400 and 5,300 mg/h) to improve its biodegradability and reduce its toxicity. Experimental findings have indicated that ozonation of lignosulphonates is a rather kinetically limited process. 20 min ozonation of lignosulfonate at a dose of 1,400 mg/h and an initial pH of 12 resulted in an 8-fold decrease in acute toxicity (EC50 = 3−4% v/v) towards the micralgae Phaedactylum tricornutum) and 50% reduction in its inert COD content (CODo = 600 mg/L). COD-based molecular size distribution indicated that the lignosulphonate formulation was cleaved to low-molecular-weight COD fractions after ozonation under the above mentioned conditions.
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Being a metropolis, Istanbul requires a well-functioning urban service system. Water supply is among the most important infrastructures in this city that has around 15-16 million habitants. There are many water treatment plants all around... more
Being a metropolis, Istanbul requires a well-functioning urban service system. Water supply is among the most important infrastructures in this city that has around 15-16 million habitants. There are many water treatment plants all around Istanbul to facilitate healthy water supply to people. On the other hand, these plants are sources of negative environmental impacts. In this perspective, it is necessary to investigate the ways to reduce these negative environmental impacts. The objective of this study is to evaluate the environmental impacts of Kagithane Water Treatment Plant (KWTP) by adopting life cycle assessment (LCA) methodology. KWTP is one of the biggest water treatment plants in Turkey. The treatment plant is located on the western side of Istanbul. It withdraws water from Terkos Lake and Alibey Dam. Energy input is addressed as the most important contributor to all environmental impact categories. In conclusion, it is recommended to develop strategies for the reduction o...
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The objective of this study is to investigate the environmental impacts of a printed circuit board (PCB) manufacturing plant through streamlined life cycle assessment approach. As a result, the most effective recommendations on minimizing... more
The objective of this study is to investigate the environmental impacts of a printed circuit board (PCB) manufacturing plant through streamlined life cycle assessment approach. As a result, the most effective recommendations on minimizing the environmental impacts for the mentioned sector are revealed and first steps towards establishing a country specific database are taken. The whole PCB production consists of two consecutive stages: namely board fabrication followed by the manufacturing of PCB. Manufacturing of PCB contributes the highest shares to freshwater aquatic ecotoxicity potential (FAETP) and ozone layer depletion potential (ODP). Eighty-nine percent of FAETP is found to be generated from the manufacturing of PCB. Almost all of this contribution can be attributed to the disposal of copper containing wastewater treatment sludge from etching operations to incineration. On the other hand, PCB manufacturing has 73% share in total ODP. Within the manufacturing of PCB, as etchi...
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Technical applicability of zero discharge conditions is evaluated for the specific case of a large metal finishing industry located within the protection zone of a surface water body designated as a potential source for domestic water... more
Technical applicability of zero discharge conditions is evaluated for the specific case of a large metal finishing industry located within the protection zone of a surface water body designated as a potential source for domestic water supply. Within the context of a sound water management strategy, a detailed process profile of the plant is established with relevant balance between water demand and wastewater generation. Quality restrictions for various water uses are identified. Wastewater flows are segregated depending on significant quality parameters. A comprehensive treatment scheme is defined for optimum wastewater recycle and reuse. Source allocation is made for the reuse of different streams of recycled wastewater. The study indicates that wastewater reuse can only be implemented with an efficiency of around 85-90% for the selected industry.
Research Interests: Environmental Science, Water Purification, Waste Management, Medicine, Multidisciplinary, and 15 moreWater Management, Water Supply, Wastewater, Water Demand, Surface Water, Reuse, Water Use, Metals, Chemical Industry, Industrial Location, Industrial Waste, Wastewater reuse, Reproducibility of Results, Effluent, and Conservation of Natural Resources
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The study emphasizes wastewater characteristics of two different textile plants as they apply to biological treatment. Although conventional characterization reveals no major differences, the effluents from the acrylic fiber and yarn... more
The study emphasizes wastewater characteristics of two different textile plants as they apply to biological treatment. Although conventional characterization reveals no major differences, the effluents from the acrylic fiber and yarn dyeing plant exhibit all the properties of a non-biodegradable wastewater. Appropriate pretreatment consisting of partial chemical oxidation with H2O2 reduces its COD content to 700 mg l−1, almost entirely biodegradable whereas COD fractionation indicates that the effluents of the cotton knit dyeing plant contain 9% residual fractions. Experimental investigation shows that most kinetic and stoichiometric properties of both wastewaters are compatible with that of domestic sewage with the exception of a much slower hydrolysis rate.
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Research Interests: Engineering and Reuse
Tekstil, mezbaha, hayvan besiciligi vs. gibi tarima dayali endustriler ulkemizdeki en onemli endustri dallarini olusturduklari icin bu arastirma projesi icin pilot kategoriler olarak secilmislerdir. Gunumuzde cevre biyoteknolojisi... more
Tekstil, mezbaha, hayvan besiciligi vs. gibi tarima dayali endustriler ulkemizdeki en onemli endustri dallarini olusturduklari icin bu arastirma projesi icin pilot kategoriler olarak secilmislerdir. Gunumuzde cevre biyoteknolojisi anlayisi atilim icerisindedir. Bu yeni gelisim ozellikle cok bilesenli modelleme yaklasimlari ve buna bagli olan atiksu karakterizasyonu ve aritilabilirlik kavramlarinda kendini gostermektedir. Evsel atiksular icin tanimlanmis ve denenmis olan yeni biyoteknoloji yaklasimlari bu calisma kapsaminda, secilen tarima dayali endustriyel atiksulara uyarlanmistir. Atiksular genellikle biyolojik aritilabilirlik acisindan miktarca cok genis aralikta degisen organik maddeleri icerir. Ozellikle endustriyel atiksularda, atiksu karakterizasyonunun dogru olarak yapilmamasi, diger bir deyisle substrat bilesenlerinin sagliksiz saptanmasi, biyolojik aritilabilirlik sonuclarinin yanlis yorumlanmasina yol acacagindan buyuk onem tasir. Biyoteknoloji alanindaki son kavramsal ge...
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Ozonation was tested on selected streams of cotton finishing textile plant wastewater for optimizing chemical oxygen demand (COD) removal. For this purpose, significant COD fractions in the wastewater were experimentally identified and... more
Ozonation was tested on selected streams of cotton finishing textile plant wastewater for optimizing chemical oxygen demand (COD) removal. For this purpose, significant COD fractions in the wastewater were experimentally identified and the effect of ozone on these fractions was investigated. Ozonation experiments were performed with a 1 dm3 sample volume. Ozone treatment of batches of raw wastewater provided, at a rate of 62 mg min−1 and a gas feeding time of 15 min, achieved complete colour removal but only 21% COD reduction. Increasing the feeding time to 30 min slightly increased the COD removal to 32%. At this feeding time, removal of the readily biodegradable COD was 60%, but soluble inert COD reduction remained at 16%, indicating selective preference of ozone for simpler compounds. At low concentrations, ozone was mainly influential on soluble COD compounds. Longer feeding times also affected particulate compounds, resulting in the solubilization of the COD fractions. Pre‐ozon...
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The objective of this study is to comparatively appraise the environmental impacts of formulating two metal surface coating chemicals (Product A and B) that can substitute each other via life cycle assessment methodology. The effect of... more
The objective of this study is to comparatively appraise the environmental impacts of formulating two metal surface coating chemicals (Product A and B) that can substitute each other via life cycle assessment methodology. The effect of using various energy sources during manufacturing is investigated. The functional unit is defined as 1000 kg product. A cradle-to-gate approach is adopted as system boundaries. The explored environmental impact categories are as follows: global warming (GWP), abiotic depletion (ADP fossils and elements), acidification (AP), eutrophication (EP), freshwater aquatic ecotoxicity (FAETP), human toxicity (HTP), ozone depletion (ODP), photochemical ozone creation (POCP) and terrestrial ecotoxicity (TETP) potentials. GWP of Product A is 7% higher than that of Product B. For all the other impact categories apart from GWP, Product A yields lower results. FAETP, ADP elements, ODP, EP, HTP, POCP, AP, ADP fossil and TETP of Product B are 116%, 72%, 55%, 49%, 38%, 33%, 26%, 26% and 18% higher than Product A, respectively. Noteworthy reductions on environmental impacts generated by energy consumption are obtained for almost all of the impact categories apart from ADP elements, when photovoltaic cells are used instead of grid electricity. Similarly, reductions in all environmental impact categories except for ADP elements are found in the case of using wind turbines instead of the grid. More than 95% decreases are observed for ADP fossil, AP, EP, GWP, ODP and POCP by getting energy from wind instead of grid. The most environmentally friendly energy alternative is addressed as wind energy except for ADP elements. It is recommended to perform LCA studies related to zinc phosphating chemicals, as very limited studies can be found. These results can be used to guide the environmental policies related to the chemical, metal and coating sectors.
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In order to eliminate water scarcity problems, effective precautions must be taken. Growing competition for water is increasingly forcing facilities to tackle their own water scarcity problems. At this point, application of wastewater... more
In order to eliminate water scarcity problems, effective precautions must be taken. Growing competition for water is increasingly forcing facilities to tackle their own water scarcity problems. At this point, application of wastewater reclamation and reuse results in considerable economic advantageous. In this study, an enamel coating facility, which is one of the high water consumed facilities, is evaluated in terms of its wastewater reuse potential. Wastewater reclamation and reuse can be defined as one of the best available techniques for this sector. Hence, process and pollution profiles together with detailed characterization of segregated wastewater sources are appraised in a way to find out the recoverable effluent streams arising from enamel coating operations. Daily, 170 m<sup>3</sup> of process water is required and 160 m<sup>3</sup> of wastewater is generated. The segregated streams generated by two enamel coating processes are characterized in ter...
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The aim of this study is to evaluate the environmental impacts of high-density polyethylene (HDPE) packaging materials with the help of life cycle methodology. The production of HDPE plastics has two consecutive steps of granulate... more
The aim of this study is to evaluate the environmental impacts of high-density polyethylene (HDPE) packaging materials with the help of life cycle methodology. The production of HDPE plastics has two consecutive steps of granulate production and blow molding. When production of HDPE and transportation stages are considered, highest shares in global warming potential (GWP), photochemical ozone creation potential (POCP), acidification potential (AP), and eutrophication potential (EP) are due to granulate production. On the other hand, blow molding is the main contributor to ozone depletion potential (ODP) with regard to production and transportation stages. Incineration is observed to exert positive impacts on POCP, AP, and EP. Recycling has positive effect on all impact categories except EP. Besides, as landfilling elevates environmental impacts, it is not recommended as an end-of-life fate for HDPE packaging wastes.
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This study investigates the occupational health and safety for a gas meter manufacturing plant. The risk assessment and management study is applied to plastic injection and mounting departments of the factory through quantitative Fine... more
This study investigates the occupational health and safety for a gas meter manufacturing plant. The risk assessment and management study is applied to plastic injection and mounting departments of the factory through quantitative Fine Kinney method and the effect of adopting 5S workplace organization procedure on risk assessment is examined. The risk assessment reveals that there are 17 risks involved; 14 grouped in high risk class (immediate improvement as required action); 2 in significant (measures to be taken as required action) and one in possible risk class (monitoring as required action). Among 14 high risks, 4 can be reduced by 83 % to be grouped under possible class when 5S is applied. One significant risk is observed to be lowered by 78 % and considered as possible risk due to the application of 5S. As a result of either 67 or 50 % reductions in 7 high risks, these risks are converted to be members of significant risk group after 5S implications.
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The treatability of four different commonly applied textile auxiliary chemicals, namely two tannin formulations (Tannin 1: a condensation product of aryl sulphonate; Tannin 2: natural tannic acid) and two biocidal finishing agents... more
The treatability of four different commonly applied textile auxiliary chemicals, namely two tannin formulations (Tannin 1: a condensation product of aryl sulphonate; Tannin 2: natural tannic acid) and two biocidal finishing agents (Biocide 1: 2,4,4'-trichloro-2'- hydroxydiphenyl ether; Biocide 2: a nonionic diphenyl alkane derivative) with ozone was investigated. Increasing the ozone dose yielded higher COD removals for the natural tannin. Optimum ozone doses of 485 and 662 mg/h were obtained at a pH of 3.5 for natural and synthetic tannin carrying textile bath discharges, respectively. When the reaction pH was increased from 3.5 to 7.0, a slight decrease in COD removal was observed for the natural tannin due to ozone selectivity towards its polyaromatic structure. The same increase in ozonation pH enhanced COD removals for the synthetic tannin as a result of enhanced ozone decomposition rendering free radical chain reactions dominant. Optimum ozone doses of 499 and 563 mg/h were established for Biocide 1 and 2, respectively. With the increase of ozonation, pH exhibited a positive influence on COD removals for both textile tannins. A substantial improvement in terms of TOC removals was observed as the reaction pH was increased from 3.5 to 7.0 for the synthetic tannin, and from 7 to 12 for both textile biocides. Higher AOX removals were evident at pH 7 than at pH 12 for Biocide 1 as a result of the higher selectivity of the dehalogenation reaction at neutral pH.
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SUMMARY In this study a corn wet mill producing corn germ, fiber, gluten, glucose, modified starch goods, starch and dextrin from corn grits was examined in terms of its pollution profile. The identified wastewater sources mainly... more
SUMMARY In this study a corn wet mill producing corn germ, fiber, gluten, glucose, modified starch goods, starch and dextrin from corn grits was examined in terms of its pollution profile. The identified wastewater sources mainly consisting of steep water evaporator vapor condensate and evaporator cleaning water from the wet mill, vacuum filter filtrate from the modified starch production and flash cooler condensate, activated carbon recovery water, demineralization unit cleaning water from glucose refinery were characterized and the pollution profile was established. The general discharge had a total COD content of 4850 mg/l and a soluble COD of 3850 mg/l. BOD5 /COD ratio of the general discharge was assessed as approximately 0.62.
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Poultry processing generates strong wastewaters with characteristics that may be tailored by appropriate adjustment of the operation. The organic content has a residual fraction in the order of 200-400 mgl−1, depending on the strength of... more
Poultry processing generates strong wastewaters with characteristics that may be tailored by appropriate adjustment of the operation. The organic content has a residual fraction in the order of 200-400 mgl−1, depending on the strength of the wastewater. The values of kinetic and stoichiometric constants related to biological treatability are observed to be quite comparable with domestic sewage. The hydrolysis of slowly biodegradable organics is best described by dual-hydrolysis kinetics with appreciably different rate constants for soluble and particulate components. The experimental results of the study may be used to evaluate the achievable compliance with existing effluent limitations and to define the optimum in-plant operation and wastewater treatment and disposal strategy.
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Corn wet mill effluents are studied in terms of their characteristics relevant for biological treatment. They have a high COD of mainly soluble and biodegradable nature, with practically no soluble inert components. They generate a... more
Corn wet mill effluents are studied in terms of their characteristics relevant for biological treatment. They have a high COD of mainly soluble and biodegradable nature, with practically no soluble inert components. They generate a relatively high level of soluble residual metabolic products, which affects the choice of the appropriate biological treatment and favors aerobic activated sludge process. Experimental assessment of process kinetics yields typical values. Hydrolysis of the slowly biodegradable COD, the rate limiting step for the utilization of substrate, is characterized by an overall rate coefficient, which is within the range commonly associated for the hydrolysis of starch.
Research Interests: Chemistry, Kinetics, Starch, Activated Sludge, Medicine, and 14 moreMultidisciplinary, Biodegradation, Solubility, Anaerobic Treatment, Water Science and Technology, Zea mays, Oxygen, Pulp and Paper Industry, Biological treatment, Activated Sludge Process, Industrial wastewater, Effluent, Hydrolysis, and Rate Limiting
Ozonation applied prior to biological processes, has proved to be a very effective chemical treatment step mostly for colour removal when soluble dyes are used in textile finishing operations. Its impact on biological treatability however... more
Ozonation applied prior to biological processes, has proved to be a very effective chemical treatment step mostly for colour removal when soluble dyes are used in textile finishing operations. Its impact on biological treatability however has not been fully evaluated yet. This study evaluates the effect of ozonation on the quality of wastewater from a textile mill involving bleaching and reactive dyeing of cotton and synthetic knit fabric. The effect of ozonation on COD fractionation and kinetic coefficients defining major biological processes is emphasised. The results indicate that the extent of ozone applied greatly affects the remaining organic carbon composition in the wastewater. The relative magnitude of different COD fractions varies as a function of the ozone dose. Ozonation does not however exert a measurable impact on the rate of major biological processes.
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Izmit Bay is located at the eastern end of the Sea of Marmara. The Sea of Marmara is an important adjacent area to the Mediterranean Sea. The extent of pollution in the Bay is increased beyond tolerable levels mainly due to substantial... more
Izmit Bay is located at the eastern end of the Sea of Marmara. The Sea of Marmara is an important adjacent area to the Mediterranean Sea. The extent of pollution in the Bay is increased beyond tolerable levels mainly due to substantial and unplanned growth of a large spectrum of industrial activities. A comprehensive project for the prevention and elimination of pollution in Izmit Bay is realised. The assessment of pollution from land‐based sources was the most significant step in this project. The study revealed that the Bay receives a total municipal wastewater flow of 70 000 cu m/day and a total industrial waste discharge of 120 000 cu m/day. The total BOD load was noted to be subdivided as 30 000 kg/day and 75 000 kg/day between municipal and industrial sources respectively. Similar figures were also computed for all the other parameters including nutrients and heavy metals. The evaluation showed that the eastern part of the Bay receives more than 70% of the total pollution load.
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The aim of this study is to appraise environmental impacts of a Turkish office desk via life cycle approach. Global warming potential (GWP), acidification potential (AP), eutrophication potential (EP), photochemical ozone creation... more
The aim of this study is to appraise environmental impacts of a Turkish office desk via life cycle approach. Global warming potential (GWP), acidification potential (AP), eutrophication potential (EP), photochemical ozone creation potential (smog) (POCP) and ozone depletion potential (ODP) are the investigated environmental impact categories. The obtained results indicate that end of life stage yields beneficial outcomes in AP, EP, POCP and ODP impact categories. The highest shares in all impact categories are obtained as a result of material acquisition and pre-processing stage. After this mentioned stage, the contribution of end of life stage causes the highest impact on GWP. Apart from GWP then comes the production stage.
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The main objective of this study is to find out the global warming potential of a renewable source of energy, namely a wind farm. Life Cycle Assessment (LCA) methodology, which is widely used for evaluation of different energy production... more
The main objective of this study is to find out the global warming potential of a renewable source of energy, namely a wind farm. Life Cycle Assessment (LCA) methodology, which is widely used for evaluation of different energy production routes, is adopted to investigate the environmental impacts of an onshore wind farm in Turkey. The functional unit based approach of LCA ease the comparison of different technologies for energy production. The chosen onshore wind farm is in Marmara region and located close to Istanbul. Total installed capacity of the wind farm is 47.5 MW and it consists of 2.5 MW Nordex wind turbines. The farm has been producing energy since 2014, and the monthly average energy production in year 2016 is 13600 MWh. The system boundary covers material extraction, part production, construction, operation and maintenance and decommissioning. The results are given per 1 kWh electricity produced. Lifetime of the wind farm is planned as 25 years and at the end of this time span wind farm is assumed to be dismantled. After decommissioning half of the metals are assumed to be recycled, the rest of the materials will be disposed through appropriate routes. Material amounts and processing data for part production, construction and operation and maintenance phases are collected from the actual wind farm and disposal routes are assumed according to regulations. GaBi software is used for modelling and Professional database is used for background data. CML is used for converting emissions into environmental impact categories.
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The objective of this study is to investigate the environmental impacts of a Turkish sofa manufacturing plant by adopting life cycle perspective. For this purpose global warming potential (GWP), acidification potential (AP),... more
The objective of this study is to investigate the environmental impacts of a Turkish sofa manufacturing plant by adopting life cycle perspective. For this purpose global warming potential (GWP), acidification potential (AP), eutrophication potential (EP), photochemical ozone creation potential (smog) (POCP) and ozone depletion potential (ODP) are the evaluated. The raw material extraction and processing is found to be the most important stage with the highest contribution to all impact categories. Textile manufacturing has the highest effect in raw material extraction and processing stage. Therefore, it is recommended to concentrate further efforts on used textile. Either substituting new materials instead of the used textile or optimizing the textile manufacturing process can yield lower environmental impacts.
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The objective of this study is to investigate the environmental impacts of a printed circuit board (PCB) manufacturing plant through streamlined life cycle assessment approach. As a result, the most effective recommendations on minimizing... more
The objective of this study is to investigate the environmental impacts of a printed circuit board (PCB) manufacturing plant through streamlined life cycle assessment approach. As a result, the most effective recommendations on minimizing the environmental impacts for the mentioned sector are revealed and first steps towards establishing a country specific database are taken. The whole PCB production consists of two consecutive stages: namely board fabrication followed by the manufacturing of PCB. Manufacturing of PCB contributes the highest shares to freshwater aquatic ecotoxicity potential (FAETP) and ozone layer depletion potential (ODP). Eighty-nine percent of FAETP is found to be generated from the manufacturing of PCB. Almost all of this contribution can be attributed to the disposal of copper containing wastewater treatment sludge from etching operations to incineration. On the other hand, PCB manufacturing has 73% share in total ODP. Within the manufacturing of PCB, as etching operations are found to be of importance for all the impact categories except eutrophication potential (EP), it is recommended to focus further studies on in-plant control of etching.
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The treatability of four different commonly applied textile auxiliary chemicals, namely two tannin formulations (Tannin 1: a condensation product of aryl sulphonate; Tannin 2: natural tannic acid) and two biocidal finishing agents... more
The treatability of four different commonly applied textile auxiliary chemicals, namely two tannin formulations (Tannin 1: a condensation product of aryl sulphonate; Tannin 2: natural tannic acid) and two biocidal finishing agents (Biocide 1: 2,4,4'-trichloro-2'-hydroxydiphenyl ether; Biocide 2: a nonionic diphenyl alkane derivative) with ozone was investigated. Increasing the ozone dose yielded higher COD removals for the natural tannin. Optimum ozone doses of 485 and 662 mg/h were obtained at a pH of 3.5 for natural and synthetic tannin carrying textile bath discharges, respectively. When the reaction pH was increased from 3.5 to 7.0, a slight decrease in COD removal was observed for the natural tannin due to ozone selectivity towards its polyaromatic structure. The same increase in ozonation pH enhanced COD removals for the synthetic tannin as a result of enhanced ozone decomposition rendering free radical chain reactions dominant. Optimum ozone doses of 499 and 563 mg/h were established for Biocide 1 and 2, respectively. With the increase of ozonation, pH exhibited a positive influence on COD removals for both textile tannins. A substantial improvement in terms of TOC removals was observed as the reaction pH was increased from 3.5 to 7.0 for the synthetic tannin, and from 7 to 12 for both textile biocides. Higher AOX removals were evident at pH 7 than at pH 12 for Biocide 1 as a result of the higher selectivity of the dehalogenation reaction at neutral pH.
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This study investigates the occupational health and safety for a gas meter manufacturing plant. The risk assessment and management study is applied to plastic injection and mounting departments of the factory through quantitative Fine... more
This study investigates the occupational health and safety for a gas meter manufacturing plant. The risk assessment and management study is applied to plastic injection and mounting departments of the factory through quantitative Fine Kinney method and the effect of adopting 5S workplace organization procedure on risk assessment is examined. The risk assessment reveals that there are 17 risks involved; 14 grouped in high risk class (immediate improvement as required action); 2 in significant (measures to be taken as required action) and one in possible risk class (monitoring as required action). Among 14 high risks, 4 can be reduced by 83 % to be grouped under possible class when 5S is applied. One significant risk is observed to be lowered by 78 % and considered as possible risk due to the application of 5S. As a result of either 67 or 50 % reductions in 7 high risks, these risks are converted to be members of significant risk group after 5S implications.
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This study investigates the effect of the dibutylphthalate spillage scenarios on the general layout of a plant using this auxiliary. The aim is to reveal the operating conditions of two alternative chambers with 300 and 900 m3 volumes in... more
This study investigates the effect of the dibutylphthalate
spillage scenarios on the general layout
of a plant using this auxiliary. The aim is to reveal the
operating conditions of two alternative chambers with
300 and 900 m3 volumes in a plant where possible dibutylphthalate
addition to the processes can take place.
The allocation of chambers and the related air exchange
requirements are simulated to get rid of the negative
impacts of possible spillages on the health of the
workers. US EPA Indoor Air Quality and Inhalation
Exposure (IAQX) Version 1.0 Model for single
component solvent is used. The spillage of 5, 8 and 10
liters of di-butylphthalate within alternative production
chambers are simulated by using 3 different air
exchange rates (AER) 1 per hour (8 times in 8 hours), 5
per hour and 10 per hour. The simulations are
performed by assuming immediate cleaning within half
an hour after the spillage. The results showed that when
300 m3 chamber will be used for di-butylphthalate
addition to the processes, an air exchange rate of 10 per
hour is required. In this chamber the air exchange rate
can be reduced to 5 per hour only if not more than 5
liters of di-butylphthalate is applied at a time. On the
other hand an air exchange rate of at least 1 per hour
must be adopted to tackle the problem of 8 liter dibutylphthalate
spillage in the room with 900 m3
volume. However, an air exchange rate of 10 per hour is
required for 10 liter di-butylphthalate spillages in this
room.
spillage scenarios on the general layout
of a plant using this auxiliary. The aim is to reveal the
operating conditions of two alternative chambers with
300 and 900 m3 volumes in a plant where possible dibutylphthalate
addition to the processes can take place.
The allocation of chambers and the related air exchange
requirements are simulated to get rid of the negative
impacts of possible spillages on the health of the
workers. US EPA Indoor Air Quality and Inhalation
Exposure (IAQX) Version 1.0 Model for single
component solvent is used. The spillage of 5, 8 and 10
liters of di-butylphthalate within alternative production
chambers are simulated by using 3 different air
exchange rates (AER) 1 per hour (8 times in 8 hours), 5
per hour and 10 per hour. The simulations are
performed by assuming immediate cleaning within half
an hour after the spillage. The results showed that when
300 m3 chamber will be used for di-butylphthalate
addition to the processes, an air exchange rate of 10 per
hour is required. In this chamber the air exchange rate
can be reduced to 5 per hour only if not more than 5
liters of di-butylphthalate is applied at a time. On the
other hand an air exchange rate of at least 1 per hour
must be adopted to tackle the problem of 8 liter dibutylphthalate
spillage in the room with 900 m3
volume. However, an air exchange rate of 10 per hour is
required for 10 liter di-butylphthalate spillages in this
room.
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An investigation covering the quantum of hazardous waste generation during production of the most common pesticide active ingredients in Turkey, namely 2,4-D acid, 2,4-D iso-octyl ester, propanil, tetramethrin, acephate, glyphosate,... more
An investigation covering the quantum of hazardous waste generation during production of the most common pesticide active ingredients in Turkey, namely 2,4-D acid, 2,4-D iso-octyl ester, propanil, tetramethrin, acephate, glyphosate, fenvalerate, cypermethrin, alfa-cypermethrin and trifluralin, is reported. Between 10 to 56 kg of hazardous waste generation per tonne of active ingredient produced was observed. Evaluation of the best available technologies (BATs) targeting the reduction of hazardous waste generation revealed approximately 10% reduction in unit hazardous waste generation.
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In this study, a metal finishing factory that is one of the biggest white-goods manufacturers in Turkey is investigated in terms of wastewater reuse. Process and pollution profiles of the factory manufacturing cookers indicate that three... more
In this study, a metal finishing factory that is
one of the biggest white-goods manufacturers in
Turkey is investigated in terms of wastewater reuse.
Process and pollution profiles of the factory
manufacturing cookers indicate that three
wastewater generating processes namely enamel
coating, paint and styrofoam processes have
potential for wastewater reuse applications.
Relatively clean segregated wastewater streams
(reusable wastewaters) are separately collected.
After stream segregation, the reusable wastewater
generation capacity of paint, enamel and styrofoam
processes are assessed to be 126, 94 and 74 m3/day,
respectively. The reusable wastewater fraction has
an approximate amount of 340 m3/day that accounts
for 68% of the total wastewaters generated from the
processes. Application of membrane separation will
be adequate to obtain process water from segregated
paint wastewaters. Segregated enamel wastewaters
must be subjected to neutralization, organic carbon
removal and membrane processes prior to be reused
in processes. Neutralization followed by membrane
separation should be prescribed for the reusable
styrofoam effluents to get required process water
criteria.
one of the biggest white-goods manufacturers in
Turkey is investigated in terms of wastewater reuse.
Process and pollution profiles of the factory
manufacturing cookers indicate that three
wastewater generating processes namely enamel
coating, paint and styrofoam processes have
potential for wastewater reuse applications.
Relatively clean segregated wastewater streams
(reusable wastewaters) are separately collected.
After stream segregation, the reusable wastewater
generation capacity of paint, enamel and styrofoam
processes are assessed to be 126, 94 and 74 m3/day,
respectively. The reusable wastewater fraction has
an approximate amount of 340 m3/day that accounts
for 68% of the total wastewaters generated from the
processes. Application of membrane separation will
be adequate to obtain process water from segregated
paint wastewaters. Segregated enamel wastewaters
must be subjected to neutralization, organic carbon
removal and membrane processes prior to be reused
in processes. Neutralization followed by membrane
separation should be prescribed for the reusable
styrofoam effluents to get required process water
criteria.
Research Interests:
The objective of this study is to evaluate the environmental impacts of a Turkish water treatment plant via life cycle assessment (LCA) approach. Target audience of the study is both decision makers of the facility under investigation,... more
The objective of this study is to evaluate the environmental impacts of a Turkish water treatment plant via life cycle assessment (LCA) approach. Target audience of the study is both decision makers of the facility under investigation, operators of similar water treatment plants and the scientific researchers that work on LCA of water treatment. Ecoinvent integrated GaBi software is used for the LCA model and CML 2001 method is used to calculate the results in terms of global warming potential (GWP), acidification potential (AP), marine aquatic ecotoxicity potential (MAEP), freshwater aquatic ecotoxicity potential (FAEP), ozone layer depletion potential (ODP), terrestric ecotoxicity potential (TETP), photochemical ozone creation potential (POCP), abiotic depletion fossil (ADP fossil), abiotic depletion elements (ADP elements), eutrophication potential (EP), human toxicity potential (HTP). The results are given per 1 m 3 water ready to be distributed to the city.