Denny Helard
Universitas Andalas, Environmental Engineering, Faculty Member
- Environmental Engineering, Water quality, wastewater reuse, integrated water resources management, water resources pollution, emerging pollutants in water, soil and groundwater, Water and wastewater treatment, (ii) Development of biological wastewater treatment system for wastewater containing toxic, persistent and less biodegradable pollutants, Biological Wastewater Treatment, Anaerobic Digestion (Methanogenic and BSR), Activated Sludge Nutrient Removal and Integrated WWTP modelling, Engineering, and 11 moreBiochemical Engineering, Water quality, Water Treatment, Wastewater Treatment, Bioenergy, Bioprocessing, Biomass Processing, Pengolahan Limbah Hotel, Water Quality Modeling, Bacteriophages, and real time PCRedit
Dalam merancang sistem pengelolaan persampahan diperlukan data-data dasar seperti data timbulan dan komposisi sampah. Selain untuk perancangan juga diperlukan untuk evaluasi dan pengembangan sistem pengelolaan persampahan yang telah ada.... more
Dalam merancang sistem pengelolaan persampahan diperlukan data-data dasar seperti data timbulan dan komposisi sampah. Selain untuk perancangan juga diperlukan untuk evaluasi dan pengembangan sistem pengelolaan persampahan yang telah ada. Untuk keperluan ...
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ABSTRAKDalam penelitian dilakukan pengolahan limbah cair Hotel yang bersumber dari dapur dan laundri dengan metode Multi Soil Layering (MSL). Tujuan penelitian ini untuk menentukan efisiensi penyisihan COD dan mempelajari pengaruh faktor... more
ABSTRAKDalam penelitian dilakukan pengolahan limbah cair Hotel yang bersumber dari dapur dan laundri dengan metode Multi Soil Layering (MSL). Tujuan penelitian ini untuk menentukan efisiensi penyisihan COD dan mempelajari pengaruh faktor variasi material organik dalam campuran tanah pada lapisan anaerob dan variasi Hydraulic Loading Rate (HLR) terhadap efisiensi pengolahan limbah cair hotel dengan metode MSL. Dua buah reaktor MSL berdimensi 50 x 15 x 100 cm dengan lapisan batuan yang sama pada kedua reaktor berupa kerikil berukuran 35 mm serta lapisan anaerob berupa campuran tanah dengan arang (reaktor 1) dan campuran tanah dengan serbuk gergaji (reaktor 2) dengan rasio komposisi 2 : 1. Limbah dialirkan pada masing-masing reaktor dengan variasi HLR 500, 750, dan 1.000 l/m2hari. Konsentrasi COD sebelum diolah adalah 132,600201,240 mg/l, setelah diolah dengan MSL konsentrasi berubah menjadi 12,48088,920 mg/l. Secara umum, variasi material organik dalam campuran tanah tidak begitu berp...
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As an effort for water resources conservation, a fixed-bed column was applied to remove nitrate from groundwater using pumice as adsorbent. The column performances were evaluated by varying the influent concentration (50 mg/L dan 80 mg/L)... more
As an effort for water resources conservation, a fixed-bed column was applied to remove nitrate from groundwater using pumice as adsorbent. The column performances were evaluated by varying the influent concentration (50 mg/L dan 80 mg/L) and influent flow rate (2 - 3 gpm/ft2 equal to 43–65 mL/min) with 85 cm of adsorbent bed depth. The results indicated that the increase in influent concentration increased the amount of nitrate and cause the earlier breakthrough time. Furthermore, the increase in influent flow rate caused the column exhaustion time to occur earlier resulted in the shortened lifespan of the column. The column system with a bed depth of 85 cm and flow rate of 2 gpm/ft2 (43 mL/min) for 80 mg/L of influent concentration showed the best nitrate uptake performance in this study with a total removal of 31.42% and adsorption capacity of 1.394 mg/g. The results revealed that the pumice in column has potential for nitrate removal from groundwater.
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Research Interests: Engineering, Environmental Science, Chemistry, Water quality, Principal Component Analysis, and 15 moreIndonesia, Environmental Monitoring, Rivers, Sustainable Water Resources Management, Water Pollution, Medicine, Biological Sciences, Pollution, Spatial Distribution, Spatial Variability, Metals, CHEMICAL SCIENCES, Water Quality, Water Environment, and Water Source
Research Interests: Engineering, Environmental Engineering, Chemical Engineering, Geology, Chemistry, and 15 moreBiochemical Engineering, Water quality, Bioenergy, Wastewater Treatment, Activated Carbon, Biodegradation, Biofuels, Biofilm, Scientific publishing, Bioprocessing, Water Quality, Carbon Fibers, Bioproducts, Biomass Processing, and estrone
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This study aims are toanalyze the spatial variation of electrical conductivity (EC) values, total suspended solids (TSS), and total dissolved solids (TDS) concentrations along the Batang Arau River. Water samples were collected from eight... more
This study aims are toanalyze the spatial variation of electrical conductivity (EC) values, total suspended solids (TSS), and total dissolved solids (TDS) concentrations along the Batang Arau River. Water samples were collected from eight stations along the river at biweekly intervalsbetween March and May 2014. The results indicate an increasing trend in the value of three parameters from upstream to downstream, reflecting the effect of natural and anthropogenic activities along the river. The EC values were in the range of 173-5,097 μS/cm and had exceeded the water quality standard established by World Health Organisation (WHO) at the downstream. The TSS and TDS concentrations were in the range of 76-2,078 mg/L and 124-3,560 mg/L, respectively. The TSS concentrations at all stations had exceeded the river quality standard of class II established by Governor Regulation of West Sumatera, while the TDS concentrations had exceeded only at the downstream area. Significant spatial variation of the EC and TDS concentrations was observed between the upstream-midstream and the downstream but was not obtained along the river for the TSS concentrations. It indicates that the anthropogenic activities along the river affected the variability of EC and TDS, but not for TSS. Based on these results, reducing the number of sampling points into three stations could be performed for the EC and TDS, while TSS monitoring at only one station could be applied.
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Latar belakang: Daerah bantaran sungai di daerah permukiman hulu Sungai Aek Sarupak memiliki karakteristik geografis dan iklim yang lebih sulit karena keterbatasan akses jalan, lahan dan kendala ekonomi yang membuat sulit untuk menerapkan... more
Latar belakang: Daerah bantaran sungai di daerah permukiman hulu Sungai Aek Sarupak memiliki karakteristik geografis dan iklim yang lebih sulit karena keterbatasan akses jalan, lahan dan kendala ekonomi yang membuat sulit untuk menerapkan sistem pelayanan sanitasi. Jumlah keluarga yang tidak memiliki akses sanitasi di Kelurahan Hutaimbaru pada tahun 2021 sebesar 241 KK dari 920 KK (26,2%). Wilayah ini telah memiliki fasilitas sanitasi berupa MCK umum dan IPAL komunal. Tujuan penelitian adalah untuk meningkatkan akses sanitasi lingkungan bagi masyarakat dengan menentukan strategi pengelolaan air limbah domestik yang sesuai dan tepat untuk diterapkan di wilayah studi.Metode: Penelitian ini adalah penelitian deskriptif dengan mixed methods atau metode kombinasi. Lokasi penelitian di wilayah permukiman pada hulu Sungai Aek Sarupak Kelurahan Hutaimbaru, Kota Padangsidimpuan pada bulan Oktober 2022. Identifikasi kondisi eksisting pengelolaan air limbah domestik dilakukan melalui observasi...
Lake Diatas is a tropical lake surrounded by agricultural land prone to pollution. A multivariate approach to lake water quality will be useful for lake management. The study's objectives are to describe fertiliser use by farmers... more
Lake Diatas is a tropical lake surrounded by agricultural land prone to pollution. A multivariate approach to lake water quality will be useful for lake management. The study's objectives are to describe fertiliser use by farmers around the lake, the lake's quality and trophic state spatially, and to use a multivariate approach to lake water quality. The results of a survey showed that most farmers use synthetic fertilisers because of low fertility soil, with self-estimated doses applied. The levels of total nitrogen (TN), total phosphorus (TP), and Secchi depth (SD) marginally exceeded the regulatory standard. However, the trophic status of the lake indicates an intermediate level of nutrients. Principal component analysis (PCA) showed the presence of two main factors with a variance of 85.46% – which showed the important drivers for lake water quality is mainly affected by agricultural activities around the lake. Cluster analysis showed three groups with the same water qua...
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Kota Padang berada pada jalur Ring of Fire yang memiliki risiko yang cukup besar terhadap ancaman gempa dan tsunami yang juga berdampak terhadap fasilitas infrastruktur sanitasi. Penelitian ini bertujuan untuk melakukan penilaian... more
Kota Padang berada pada jalur Ring of Fire yang memiliki risiko yang cukup besar terhadap ancaman gempa dan tsunami yang juga berdampak terhadap fasilitas infrastruktur sanitasi. Penelitian ini bertujuan untuk melakukan penilaian kerentanan infrastruktur sanitasi saat menghadapi skenario bencana gempa dan tsunami di Kota Padang. Metode yang dipakai dengan memberikan bobot nilai kerentanan melalui pendekatan & penyesuaian. Nilai kerentanan yang diperoleh berupa 1 untuk tingkat kerentanan rendah dan 3 untuk kerentanan tinggi dengan menghitung setiap parameter fasilitas sanitasi. Hasil penilaian kerentanan fasilitas sanitasi terhadap skenario gempa berada pada tingkat kerentanan rendah. Hasil penilaian kerentanan terhadap skenario tsunami memiliki nilai yang beragam, diantaranya 26,3% sistem drainase primer memiliki kerentanan rendah, 68,4% lainnya memiliki kerentanan tinggi. TPA memiliki kerentanan rendah. 78,7% kontainer sampah memiliki kerentanan tinggi dan 21,2% memiliki kerentanan...
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Penelitian ini bertujuan memberikan angka indeks dan tingkat kerentanan fisik sekaligus rekomendasi terhadap infrastruktur SPAM Gunung Pangilun Perumda Air Minum Kota Padang (khususnya pipa transmisi dan distribusi utama) akibat potensi... more
Penelitian ini bertujuan memberikan angka indeks dan tingkat kerentanan fisik sekaligus rekomendasi terhadap infrastruktur SPAM Gunung Pangilun Perumda Air Minum Kota Padang (khususnya pipa transmisi dan distribusi utama) akibat potensi bencana gempa bumi dan tsunami. Jaringan pipa ini melayani area dataran rendah dekat pesisir pantai sekaligus lokasi institusi dan perkantoran penting tingkat provinsi Sumatera Barat dan kota Padang. Penilaian indeks kerentanan dilakukan dengan cara melakukan pembobotan dan skoring dari faktor-faktor kerentanan yang telah ditentukan terhadap potensi bencana gempa bumi dan tsunami. Tingkat kerentanan jaringan pipa tersebut diklasifikasikan menjadi rendah, menengah dan tinggi. Hasil dari indeks kerentanan yang telah didapatkan disajikan ke dalam peta tingkat kerentanan setelah sebelumnya dilakukan perhitungan total nilai vulnerability index (VI) dari masing-masing parameter kerentanan. Dari hasil penilaian didapatkan tingkat kerentanan jaringan pipa tr...
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Modification by physical and chemical treatments was evaluated to increase the adsorption capability of natural pumice in the removal of Cu(II) from aqueous solution. The treatments were heating at temperatures of 300, 450 and 600 ℃ for... more
Modification by physical and chemical treatments was evaluated to increase the adsorption capability of natural pumice in the removal of Cu(II) from aqueous solution. The treatments were heating at temperatures of 300, 450 and 600 ℃ for physical and soaking in acid solutions (HCl, H2SO4 and HNO3) for chemical treatment. The adsorption was performed in the batch system at the optimum condition (5 of pH solution, < 63 µm of adsorbent diameter, 3 g/L of adsorbent dose, 5 mg/L of Cu(II) concentration and 30 min of contact time). The results showed the removal efficiency and Cu(II) uptake increased using modified pumice from 71.19 % and 1.19 mg/g to 84.45 % and 1.41 mg/g. The highest removal efficiency and Cu(II) uptake were obtained from 300℃ of heating temperature and HCl for the acid solution. The application of physical and chemical treatments in modification has the potential to increase the removal efficiency and heavy metal uptake of the natural pumice. HIGHLIGHTS Various metho...
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Nitrate adsorption onto the physically and chemically modified pumice was investigated as an effort for reducing groundwater pollution. The treatments were heating at temperatures of 300°C, 450°C, and 600°C for physical and soaking in... more
Nitrate adsorption onto the physically and chemically modified pumice was investigated as an effort for reducing groundwater pollution. The treatments were heating at temperatures of 300°C, 450°C, and 600°C for physical and soaking in acid solutions (HCl, H2SO4, and HNO3) for chemical treatments. The adsorption was performed in a batch system at room temperature (25±1°C) with the optimum condition (pH 4; 0.3 g/L of adsorbent dose; <63 µm of adsorbent diameters and 30 minutes of contact time). The results indicated that the physically and chemically modified pumice resulted in increasing removal efficiency and nitrate uptake compared to the natural pumice. The highest removal efficiency and nitrate uptake were achieved from 300°C of heating temperatures (62.04% and 155.09 mg/g) and H2SO4 for the acid solution (83.30% and 208.25 mg/g), while by using the natural pumice only reached 57.02 % and 142.55 mg/g. The SEM images of the modified pumice confirmed the change in the surface mo...
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Lake Diatas is surrounded by agricultural activities that cannot be separated from the use of synthetic pesticides. Improper use of pesticides may endanger the health of farmers. This research aims to observe the clean water resources, as... more
Lake Diatas is surrounded by agricultural activities that cannot be separated from the use of synthetic pesticides. Improper use of pesticides may endanger the health of farmers. This research aims to observe the clean water resources, as well as the knowledge and safety practices of pesticides among farmers around Lake Diatas. Interviews were conducted with 30 heads of families who lived and farmed around Lake Diatas. The results showed that 40% of farmers utilized rainwater as clean water, 30% used shallow well water which most of the wells were open and have no concrete ring, which vulnerable to contamination. There were 11 active ingredients detected used by farmers with one type with highly hazardous and two of them were moderately hazardous toxicity. For farmers’ knowledge, 76, 7% of farmers know that the improper use of pesticides may cause health problems and environmental pollution. There were 73, 3% of farmers determine the dose of pesticide regarding packaging label, whil...
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Kajian ini bertujuan untuk mendapatkan gambaran dan informasi yang lebih komprehensif mengenai kinerja Badan Usaha Milik Daerah (BUMD) penyelenggara Sistem Penyediaan Air Minum (SPAM) di Kabupaten Solok dan Kota Solok Sumatera Barat pada... more
Kajian ini bertujuan untuk mendapatkan gambaran dan informasi yang lebih komprehensif mengenai kinerja Badan Usaha Milik Daerah (BUMD) penyelenggara Sistem Penyediaan Air Minum (SPAM) di Kabupaten Solok dan Kota Solok Sumatera Barat pada kurun waktu 2017-2019. Kajian dilakukan dengan mengidentifikasi dan evaluasi kondisi eksisting, menganalisis permasalahan teknis dan kinerja yang meliputi aspek keuangan, aspek pelayanan, aspek operasional dan aspek sumber daya manusia, serta melakukan penilaian kinerja. Hasil penelitian menunjukkan bahwa kinerja SPAM di wilayah studi menunjukkan nilai dan status kinerja PDAM Kabupaten Solok berada pada kisaran 2.270 – 2.340 dalam kategori tidak sehat, sedangkan PDAM di Kota Solok berada pada kisaran 2.920 – 3.100 untuk kategori tidak sehat hingga sehat. Indikator yang berhasil dipenuhi SPAM wilayah studi pada tahun 2019 adalah indikator solvabilitas, tingkat penyelesaian keluhan, rasio jumlah karyawan per 1.000 nasabah. Rekomendasi yang diusulkan s...
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Penelitian ini dilatarbelakangi oleh indikasi tingginya tingkat Non Revenue Water (NRW) melalui yang ditandai tingkat komplain dan tingkat kebocoran yang cukup tinggi pada kawasan Sistem Penyediaan Air Minum (SPAM) Jawa Gadut, Kelurahan... more
Penelitian ini dilatarbelakangi oleh indikasi tingginya tingkat Non Revenue Water (NRW) melalui yang ditandai tingkat komplain dan tingkat kebocoran yang cukup tinggi pada kawasan Sistem Penyediaan Air Minum (SPAM) Jawa Gadut, Kelurahan Limau Manis Selatan Kecamatan Pauh, Kota Padang. Penelitian dimulai dari mengevaluasi SPAM eksisting dan merencanakan kembali zona SPAM menggunakan plugin QWater v.3.1.7 dari QGIS v.3.4.9 yang mengintegrasikan Epanet dengan QGIS. Simulasi hidrolis per periode waktu atau Extended Period Simulation (EPS) untuk mengevaluasi kondisi hidrolis, tekanan dan kecepatan aliran terutama pada saat aliran maksimum (jam 06.00 WIB) dan pada saat aliran minimum (jam 03.00 WIB). Dari hasil simulasi diperoleh sisa tekanan melebihi 100 mka pada 51 node dari 146 node atau 35% pelayanan. Selanjutnya dilakukan optimalisasi dan pengendalian tekanan menggunakan 2 unit Pressure Reducing Valve (PRV), agar atau sehingga diperoleh sisa tekanan sesuai dengan kriteria teknis mini...
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To increase the performance of continuous adsorption with rice husks as adsorbent in Zn removal from groundwater, a series of fixed bed column was applied. The experiments were carried out at the acrylic columns having diameter of 7 cm,... more
To increase the performance of continuous adsorption with rice husks as adsorbent in Zn removal from groundwater, a series of fixed bed column was applied. The experiments were carried out at the acrylic columns having diameter of 7 cm, column height of 19.5 cm, bed height of 13.5 cm and flow rate of 2 gpm/ft2 (310 mL/minute) for 540 minutes. The number of columns used were 3 columns arranged in series and the rice husk used were in their original size (1-2 mm). The influent concentration of Zn metal was 7.62 mg/L. The results showed that the use of column adsorption in series increased the removal efficiency of Zn by rice husks, from 33.21% using 1 column to 51.70% with 3 columns. The adsorption capacity of Zn obtained when using 3 columns in series was 3.542 mg/g. In addition, the use of adsorption columns in series can also prolong the saturation of the adsorbent, thereby extending its service life. The overall research results demonstrated that column the adsorption in series wi...
Lake Diatas is one of the largest lakes in West Sumatra with a variety of uses that are vulnerable to contamination that could endanger lake organisms. Therefore, the objective of the present study is to describe the vertical... more
Lake Diatas is one of the largest lakes in West Sumatra with a variety of uses that are vulnerable to contamination that could endanger lake organisms. Therefore, the objective of the present study is to describe the vertical distributions of both temperature and dissolved oxygen (DO) in Lake Diatas as an indication of lake quality. The samples of lake water were taken at five points, namely in the middle of the lake, Teluk Kinari, Muara Danau, Gurun Datar and in Tanduk Kecil. Frequency of taking was once a month in October, November and December 2019. Variation in depth for temperature and DO observations was based on the methods of surface-water sampling (SNI 6989.57: 2008). The present study results show that the temperature range at various points with respect to lake depth variation was 20.1 to 25.9 °C with a standard deviation of 1.15 °C, while DO was in the range of 6.2 to 7.9 mg/l. These conditions still met the quality standards of lake water (Governor Regulation No. 24 Yea...
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To investigate the potential of adsorption and regeneration of natural pumice from West Sumatera Indonesia for total chromium (Cr) removal from aqueous solution, batch experiments in multiple adsorption-desorption cycles were performed.... more
To investigate the potential of adsorption and regeneration of natural pumice from West Sumatera Indonesia for total chromium (Cr) removal from aqueous solution, batch experiments in multiple adsorption-desorption cycles were performed. The results indicated that the optimum condition of total Cr removal were 3 of pH solution, 0.3 g/L of adsorbent dose, 60 min of contact time of adsorption, <63 ?m of diameter of adsorbent, and 1 mg/L of total Cr initial concentration with 2.226 mg Cr/g pumice of total Cr uptake. The experimental data obtained were fitted with the Freundlich adsorption isotherm within the concentration range studied. Desorption efficiencies for total Cr ions by using 0.1 M HCl as desorbing agent were in the range of 31-32%. Although complete desorption were not attained, the natural pumice could be sufficiently reused up to 3 cycles of adsorption- desorption with increasing trend in total Cr uptake that may due to the surface modification of natural pumice caused ...
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Penelitian ini bertujuan untuk mengetahui prioritas lokasi dari beberapa rencana District Metered Area (DMA) untuk penurunan Non Revenue Water (NRW) pada salah satu zona Sistem Penyediaan Air Minum (SPAM) Jawa Gadut, Pauh, Kota Padang.... more
Penelitian ini bertujuan untuk mengetahui prioritas lokasi dari beberapa rencana District Metered Area (DMA) untuk penurunan Non Revenue Water (NRW) pada salah satu zona Sistem Penyediaan Air Minum (SPAM) Jawa Gadut, Pauh, Kota Padang. Dari 5 (lima) lokasi Rencana DMA dalam zona SPAM dipilih dari data yang sudah lengkap yakni pada DMA 01 dan DMA 02. Penelitian menawarkan metode yang aplikatif dan dapat diterapkan ke lokasi lain. Prioritas lokasi DMA didasarkan pada tingkat potensi NRW komponen kehilangan air fisik dan non fisik dari faktor dan subfaktor penyebab yang sudah diinput kedalam attribut spasialnya. Dengan menggunakan Weighted Sum Method (WSM) dan dipetakan melalui Geographical Information System (GIS) diperoleh hasil komponen kehilangan air fisik pada kelas potensi NRW tinggi, sedang dan rendah berurutan pada DMA 01 adalah 81%, 19%, 0% dan pada DMA 02 adalah 60,5%, 0,1%, 39,4%. Potensi NRW komponen kehilangan air non fisik pada kelas potensi NRW tinggi, sedang dan rendah ...
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The objective of this study is to analyze the spatial variability of ammonia, nitrite, and nitrate concentrations along the Batang Arau River, one of the most important rivers in West Sumatera, Indonesia. The results showed that the... more
The objective of this study is to analyze the spatial variability of ammonia, nitrite, and nitrate concentrations along the Batang Arau River, one of the most important rivers in West Sumatera, Indonesia. The results showed that the ammonium, nitrite, and nitrate concentrations were in the range of 0.180–0.510 mg/L, 0.0–0.178 mg/L, and 0.675–1.165 mg/L, respectively. The ammonium and nitrate concentrations were still below the maximum permissible concentrations for the river water quality standard of class II established by the Regulation Governor of West Sumatera at all of the sampling locations, except at midstream for ammonium, while the nitrite concentration had exceeded the quality standard from midstream to downstream of the river. The increase of the nitrogen concentration was observed from upstream to downstream of the river. Spatial analysis shows significant differences in nitrogen concentrations were obtained between the upstream and the midstream of the Batang Arau River...
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Pumice is known as a low-cost material with a porous structure, has the potential as an adsorbent to remove various kinds of pollutant compounds. The abundance of pumice is found in Sungai Pasak area and it never been utilized. This study... more
Pumice is known as a low-cost material with a porous structure, has the potential as an adsorbent to remove various kinds of pollutant compounds. The abundance of pumice is found in Sungai Pasak area and it never been utilized. This study was performed to see the ability of Sungai Pasak pumice as an adsorbent for ammonium removal in water along with its ability to be regenerated. The study was carried out triplo in batches to obtain optimum adsorption conditions which were then used in desorption experiments using HCl 0.1 M agent for regeneration process. The optimum conditions obtained: adsorbate pH 6, adsorbent dose 0.3 g/l, contact time 30 minutes, adsorbent diameter 63 µm and adsorbate concentration 4 mg/l. The results showed that pumice has ability to remove ammonium with adsorption capacity at optimum conditions were 47.06% and 6.27 mg/g with Freundlich's isotherm equation (R2=0.997). Acid agents are able to adsorb ammonium from pumice with an average desorption percentage...
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The objective of this study was to assess spatial distribution of bacterial population in Batang Arau River. The river water was sampled biweekly, during 3 successive months, and analyzed for coliform bacteria (total coliforms, TC, and... more
The objective of this study was to assess spatial distribution of bacterial population in Batang Arau River. The river water was sampled biweekly, during 3 successive months, and analyzed for coliform bacteria (total coliforms, TC, and fecal coliforms, FC). The results showed that the number of TC range 2.61 – 4.89 log10 number/100 mL and FC 2.48 – 4.79 log10 number/100 mL. The concentration of all parameters inspected has increased from upstream to downstream of the river, except for pH and DO. Bacterial coliforms were strongly correlated with some physicochemical parameters (TSS, TDS, EC and pH), with a Spearman correlation coefficient (r) ranged from -0.599 to 0.827. Analysis of the spatial distribution of the one-way ANOVA at 95% confidence level showed that there were significant differences (p<0.05) in the concentration of bacterial coliforms between upstream and downstream sampling stations as a result of differences in land use and human activity. Cluster analysis grouped...
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The potential of adsorption and regeneration of Indonesian natural pumice to remove nitrate from aqueous solution was studied in multiple adsorption-desorption cycles. Batch experiments were performed to examine the effect of various... more
The potential of adsorption and regeneration of Indonesian natural pumice to remove nitrate from aqueous solution was studied in multiple adsorption-desorption cycles. Batch experiments were performed to examine the effect of various experimental parameters on the removal of nitrate. The optimum condition of nitrate removal by natural pumice were obtained at 3 of pH solution, 0.3 g/L of adsorbent dose, 30 min of contact time, <63 μm of particle size, and 90 mg/L of nitrate concentration with 54.79% of removal efficiency and 164.37 mg/g of nitrate uptake. The experimental data obtained were fitted with the Freundlich adsorption isotherm within the concentration range studied. Although complete desorption were not achieved, the result confirmed that HCl can be used as desorbing and recovery agent, which be desorbed 10-13% of nitrate ion. The used natural pumice also could be regenerated and reused up to three successive adsorption-desorption cycles. Overall results revealed that th...
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To increase the adsorption capability of natural pumice from Sungai Pasak, West Sumatra, Indonesia in removal of Zn from aqueous solution, modification by physical and chemical treatments were evaluated. The treatments were heating at... more
To increase the adsorption capability of natural pumice from Sungai Pasak, West Sumatra, Indonesia in removal of Zn from aqueous solution, modification by physical and chemical treatments were evaluated. The treatments were heating at temperatures of 300°C, 450°C, and 600°C for physical and soaking in acid solutions (HCl, H2SO4, and HNO3) for chemical treatments. The adsorption was performed in batch system with the optimum condition (6 of pH solution, < 63 um of adsorbent diameter, 3 g/L of adsorbent dose, 5 mg/L of Zn concentration, and 15 min of contact time). The results revealed that the removal efficiency and Zn uptake increase using modified pumice from 68.83% and 1.15 mg/g to 74.46% and 1.24 mg/g. The highest removal efficiency and Zn uptake were obtained from 300°C of heating temperatures and HCl for acid solution. The application of modified adsorbent for removal of Zn from aqueous solution showed that the modification technique has the potential to increase the removal...
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This study aims to study the spatial variation of phosphates (orthophosphate, total phosphate, and organic phosphate) in the Batang Arau River, West Sumatera, Indonesia. Sampling was conducted at eight stations along the river from March... more
This study aims to study the spatial variation of phosphates (orthophosphate, total phosphate, and organic phosphate) in the Batang Arau River, West Sumatera, Indonesia. Sampling was conducted at eight stations along the river from March to May 2014. The results indicate that the three types of phosphates have similar spatial distribution patterns, with an increasing trend in concentration from upstream to downstream. The results also showed that the average orthophosphate and total phosphates concentrations at most of sampling sites had exceeded the quality standard for river water in West Sumatera (class II < 0.2 mg/L) except in the upstream. The mean concentrations of orthophosphate, total phosphates and organic phosphate were 0.054-0.423 mg/L, 0.067-0.446 mg/L, and 0.013-0.072 mg/L, respectively. Analysis of spatial variation with ANOVA at 95% confidence level indicated that differences in land use and human activities along the Batang Arau River resulted in significant diffe...
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To make the adsorption process more economic and environmental friendly, it is necessary to study desorption and reutilization of the adsorbents. In the present study, the effectiveness of natural pumice in removal of iron from aqueous... more
To make the adsorption process more economic and environmental friendly, it is necessary to study desorption and reutilization of the adsorbents. In the present study, the effectiveness of natural pumice in removal of iron from aqueous solution was investigated in several sorption-desorption cycles. The desorption characteristics of previously adsorbed iron ions on natural pumice were tested by various desorbing agents such as HCl, NaOH and aquadest. Among them, HCl showed the highest desorption efficiency (37.89%) with 0.1 M of concentration and 60 min of contact time. The removal efficiency of iron ions in reused natural pumice could be maintained up to 90% in the third cycle of adsorption. The results indicate that although complete desorption was not achieved, natural pumice from Sungai Pasak, West Sumatra, Indonesia, can be sufficiently reused up to three cycles of adsorption-desorption.
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This paper aims to assess metallic pollution in the Batang Arau River, an important source of freshwater supply for local communities in West Sumatera, Indonesia, by applying multivariate statistical techniques. Sampling was conducted... more
This paper aims to assess metallic pollution in the Batang Arau River, an important source of freshwater supply for local communities in West Sumatera, Indonesia, by applying multivariate statistical techniques. Sampling was conducted at eight stations along the river from March to May 2014. The results indicate that all the metals studied have similar spatial distribution patterns, with an increasing trend in concentration from upstream to downstream. Total concentration of six metals studied upstream, as background concentration, was 1.050 mg/L, and increased to 2.249 mg/L downstream. Spatial distribution of metals did not show significant variability (p < 0.05) for Cd, Cr, Fe, and Pb, but Co and Mn did. The results of principal component analysis/factor analysis (PCA/FA) and correlation analysis suggest that Cd, Co, and Fe are originated from natural and anthropogenic sources; Cr and Pb are derived from natural sources; and Mn is controlled by anthropogenic sources.
Research Interests: Engineering, Environmental Science, Chemistry, Water quality, Principal Component Analysis, and 15 moreIndonesia, Environmental Monitoring, Rivers, Sustainable Water Resources Management, Water Pollution, Medicine, Biological Sciences, Pollution, Spatial Distribution, Spatial Variability, Metals, CHEMICAL SCIENCES, Water Quality, Water Environment, and Water Source
Research Interests:
Adsorption of iron from aqueous solution by using maize husk (Zea mays L.) as a low-cost adsorbent was studied. Batch experiments were carried out at ambient temperature, 0.075-0.250 mm of particle size and 100 rpm of agitation speed to... more
Adsorption of iron from aqueous solution by using maize husk (Zea mays L.) as a low-cost adsorbent was studied. Batch experiments were carried out at ambient temperature, 0.075-0.250 mm of particle size and 100 rpm of agitation speed to determine the influence of initial pH, adsorbent dose, initial concentration and contact time on the removal of iron. Langmuir and Freundlich models were applied to describe the adsorption isotherm of iron by maize husk. The results showed that optimum condition of iron removal were 4 of pH solution, 20 g/L of adsorbent dose, 10 mg/L of Fe concentration and 15 min of contact time of adsorption with 0.499 mg Fe/g maize husk of adsorption capacity. Experimental data fitted well to Langmuir's adsorption equilibrium isotherm within the concentration range studied. This study demonstrated that maize husk, which is an agricultural waste, has potential for iron removal from groundwater or other polluted waters.