Anaerobic Digestion (AD) is a series of process in which microorganisms break down biodegradable ... more Anaerobic Digestion (AD) is a series of process in which microorganisms break down biodegradable material in the absence of oxygen, used for industrial or domestic purposes to manage waste and/or to release energy. It is a common scheme for industrial sludge treatment because of producing biogas the content of which includes methane (CH4)(55-65%),CO2(30-35%),small amounts of other O2, H2S etc. and is an environmentally friendly fuel. Large quantities of sludge are produced in industrial wastewater treatment. Industrial sludge has a high putrescibility and therefore has to be stabilized in order to enable an environmentally safe utilization or disposal. The anaerobic digestion is the standard technique to stabilize the industrial sludge. Digestion produces biogas and reduces the amount of organic matter. The amount of excess sludge production from wastewater treatment plants is continuously increasing. Therefore, minimization of excess industrial sludge is becoming more and more important. The objectives of the paper are the review of the anaerobic process, mass reduction, biogas production and improved dewatering properties of the treated sludge.
Bangladesh is in the midst of a severe and worsening energy crisis. With a population of about 16... more Bangladesh is in the midst of a severe and worsening energy crisis. With a population of about 160 million living in an area of 147,000 sq. km. it is one of the most densely populated countries too. Around 33% of the total population is covered by electricity network and 4% are covered under natural gas network. About 82% of total electricity comes from natural gas. As the demand is increasing and the reserve of the natural gas is decreasing, it is assumed that very early the supply of the natural gas will start to decline. The continuous depletion of fossil fuel is sticking the concern into the search for new energy source is mandatory. So we should focus our view on the alternative renewable energy sources such as solar energy, biogas, biodiesel, wind power, tidal energy etc. Here biogas is one of the promising renewable energy sources in Bangladesh. As an agricultural country, Bangladesh has embedded with plenty of biomass which has been used for extracting energy by burning dire...
The research work was conducted to investigate the production ability of biogas from sewage sludg... more The research work was conducted to investigate the production ability of biogas from sewage sludge with co-digestion of kitchen waste through anaerobic digestion. Firstly three digesters were prepared to observe the individual degradation rate of kitchen waste, sewage sludge and co-digested SS with KW at temperature 37°C (mesophilic digestion). Secondly, four digesters were constructed where KW and SS were co-digested at ratios of 2:1, 4:1, 6:1 and 8:1 respectively at loading rates of 100, 200, 300 and 400 g/L. Thirdly, three digesters were constructed to observe the effect of alkalinity at temperature 37°C at a loading rate 200 g/L. Three alkali (NaOH) doses 1.0%, 1.5% and 2.0% on wet matter basis of kitchen waste were applied to improve biodegradability and biogas production. The highest degradation rate was obtained from 1.5% NaOH. Finally, a portable biogas reactor was fabricated for pilot-scale biogas production which included an agitator and heating system.
Anaerobic Digestion (AD) is a series of process in which microorganisms break down biodegradable ... more Anaerobic Digestion (AD) is a series of process in which microorganisms break down biodegradable material in the absence of oxygen, used for industrial or domestic purposes to manage waste and/or to release energy. It is a common scheme for industrial sludge treatment because of producing biogas the content of which includes methane (CH4)(55-65%),CO2(30-35%),small amounts of other O2, H2S etc. and is an environmentally friendly fuel. Large quantities of sludge are produced in industrial wastewater treatment. Industrial sludge has a high putrescibility and therefore has to be stabilized in order to enable an environmentally safe utilization or disposal. The anaerobic digestion is the standard technique to stabilize the industrial sludge. Digestion produces biogas and reduces the amount of organic matter. The amount of excess sludge production from wastewater treatment plants is continuously increasing. Therefore, minimization of excess industrial sludge is becoming more and more important. The objectives of the paper are the review of the anaerobic process, mass reduction, biogas production and improved dewatering properties of the treated sludge.
Bangladesh is in the midst of a severe and worsening energy crisis. With a population of about 16... more Bangladesh is in the midst of a severe and worsening energy crisis. With a population of about 160 million living in an area of 147,000 sq. km. it is one of the most densely populated countries too. Around 33% of the total population is covered by electricity network and 4% are covered under natural gas network. About 82% of total electricity comes from natural gas. As the demand is increasing and the reserve of the natural gas is decreasing, it is assumed that very early the supply of the natural gas will start to decline. The continuous depletion of fossil fuel is sticking the concern into the search for new energy source is mandatory. So we should focus our view on the alternative renewable energy sources such as solar energy, biogas, biodiesel, wind power, tidal energy etc. Here biogas is one of the promising renewable energy sources in Bangladesh. As an agricultural country, Bangladesh has embedded with plenty of biomass which has been used for extracting energy by burning dire...
The research work was conducted to investigate the production ability of biogas from sewage sludg... more The research work was conducted to investigate the production ability of biogas from sewage sludge with co-digestion of kitchen waste through anaerobic digestion. Firstly three digesters were prepared to observe the individual degradation rate of kitchen waste, sewage sludge and co-digested SS with KW at temperature 37°C (mesophilic digestion). Secondly, four digesters were constructed where KW and SS were co-digested at ratios of 2:1, 4:1, 6:1 and 8:1 respectively at loading rates of 100, 200, 300 and 400 g/L. Thirdly, three digesters were constructed to observe the effect of alkalinity at temperature 37°C at a loading rate 200 g/L. Three alkali (NaOH) doses 1.0%, 1.5% and 2.0% on wet matter basis of kitchen waste were applied to improve biodegradability and biogas production. The highest degradation rate was obtained from 1.5% NaOH. Finally, a portable biogas reactor was fabricated for pilot-scale biogas production which included an agitator and heating system.
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Papers by Shahinur Rahaman