This research studied the reduction of pollution load from textile wastewater through COD and col... more This research studied the reduction of pollution load from textile wastewater through COD and color removal using electrocoagulation technique. Experiments were carried out on a laboratory scale using mono-polar two aluminum plate as electrode material with total 32.68 cm2 of reaction area. The electrical potential was 12-24 volts. Inter-electrode spacing was kept at 4 cm. The effects of relevant wastewater characteristics such as pH, and important process variables such as applied voltage and operating time on the chemical oxygen demand (COD) and color removal efficiency has been explored. Maximum removal of COD (86.5%) and color (93.4%) was observed at initial pH of 5, the cell time operation was 60 minutes. These results indicate that electrocoagulation process using aluminum electrodes could be effective for removal of COD and color from textile wastewater.
The study has attempted to observe three models of biogas system using twenty liter plastic conta... more The study has attempted to observe three models of biogas system using twenty liter plastic containers as digesters with Cow Dung (CD) and Poultry Droppings (PYD) organic wastes. The cow dung and poultry dropping were mixed separately with water in a ratio of 1:1 (v/v) and the slurry was properly stirred. Thereafter Treatments A, B, C, D and E were prepared using previously made slurry with the following specific proportions as (100% CD + 0% PYD), (75% CD + 25% PYD), (50% CD + 50% PYD), (25% CD + 75% PYD) and (0% CD + 100% CD). Three replicates were carried out for each sample. The plant consists of the fermentation chamber, the inlet and outlet pipe, the gas pipe and the stirrer. The samples were tested for methane and carbon dioxide productions along with pH and Temperature for 31days. Treatment D which is a mixture of (25% cow dung and 75% poultry droppings) produced more methane than the rest of the treatments. 96.08%. The cumulative methane yields of treatments D, A, C, E and B...
The surface water pollution is considered as one of the most serious environmental problems in mo... more The surface water pollution is considered as one of the most serious environmental problems in most developing countries. Most of the rivers in the urban areas of the developing world are the end points of effluents discharged from the industries and domestic sources. In Dhaka, huge quantities of untreated domestic and industrial wastes are being released everyday in the Sitalakhya river, flowing along the eastern side of the city. The water quality of this river is deteriorating rapidly, especially during dry season at certain reaches of the river. The Saidabad water treatment plant, which draws water from the Sitalakhya river near Sarulia (around 400m downstream of its confluence with heavily polluted Balu river), is facing serious problems in treating water due to poor raw water quality, especially due to the presence of excessive ammonia and algae at the intake areas during the dry season. In this study, the present status of water quality of the Sitalakhya river, Balu river, To...
Arsenic contamination in groundwater and its toxic effect on human health is a major public healt... more Arsenic contamination in groundwater and its toxic effect on human health is a major public health problem in Bangladesh. There are 270 arsenic prone upazillas in the country and the total population exposed to arsenic contamination has been estimated as 24.5 million (around 19 percent of total population). Among 4.95 million tube wells in the 270 upazillas, 29 percent tubewells are contaminated with arsenic. The number of arsenicosis patients has come out as 38,430. Given the fact that any effective treatment for arsenicosis is yet to be developed, supply of arsenic safe drinking and cooking water to the population exposed to arsenic contamination is the principal way of mitigating the problem. Considering the urgency and gravity of the problem, alternative water supply options like dug wells(DW), deep tubewells(DTW), pond sand filters(PSF) and rain water harvesting systems(RWHS) are being installed in arsenic affected areas under arsenic mitigation programme. The study aimed at as...
The adsorption of Eurozol Navy reactive dye was examined by orange and lemon peel powder consider... more The adsorption of Eurozol Navy reactive dye was examined by orange and lemon peel powder considering several parameters as pH, contact time, speed of shaker, temperature and initial dye concentration, single and combined adsorbent dosage. Turbidity and dye extraction parameters also observed. The adsorption obeys both Langmuier and Freundlich isotherm. The removal percentages for orange and lemon peel are 81% and 87% respectively and 91% for combined adsorbent dosages.
The environment of Dhaka city is depraving gradually day by day because of unplanned urbanization... more The environment of Dhaka city is depraving gradually day by day because of unplanned urbanization, destruction of greeneries by increasing building and economical activities areas to meet the demand of migrated people. This scenario is enhancing the negative change in climate gradually. It is one of the main causes of Buriganga river pollution because of climate change impact. Dhaka city is capital of Bangladesh, which largely depends on the Buriganga River‘s water for drinking, fishing, carrying merchandise and transportation. The quality of water in this river was very poor and the average DO, BOD5, COD, Nitrate and Phosphate concentration in mg/L were 1.11, 82.3, 148.45, 5.92 and 5.83 respectively. This study mainly focused the climate change impact in term of rainfall on Buriganga River and disclosed it that decreasing the rate of rainfall affect the discharge of river because of climate change and increasing the rate of waste water because of incremental economical activities i...
About 29 million people are either directly or indirectly exposed to arsenic contamination with v... more About 29 million people are either directly or indirectly exposed to arsenic contamination with varying degrees of risk due to extensive arsenic contamination of the groundwater in the alluvial aquifers of Bangladesh. Considering the urgency and gravity of the problem, alternative water supply options like dugwells (DW), deep tubewells (DTW), pond sand filters (PSF) and rain water harvesting systems (RWHS) are being installed in arsenic affected areas under arsenic mitigation programme. The study aimed at assessing the water quality in both dry and wet seasons, sanitary integrity, functional ity, operation and maintenance and social acceptability of dugwells. The study was conducted on 11 dugwells of Charghat, Dohar and Gazaria. Microbial contaminations were found in 95 percent water samples of DWs. None of DW water sampled in this study had an arsenic concentration higher than the Bangladesh drinking water standard (BDS) of 50 μg/L but arsenic concentrations exceeding the WHO guide...
Arsenic contamination in groundwater and its toxic effect on human health is a major public healt... more Arsenic contamination in groundwater and its toxic effect on human health is a major public health problem in Bangladesh and it is emphasized in the national level to use alternative water sources for drinking water to mitigate the arsenic problem. To identify reasons of nonfunctioning and in order to develop a comparative information and better understanding of the options, assessment of alternative water supply options in both technical and social aspects are essential. The study was conducted on 11 Dug wells (DW) of Charghat, Dohar and Gazaria, 9 Deep hand tubewells (DTW) of Dohar and Gournadi, 17 Rain water harvesting systems (RWHS) of Charghat, Gournadi, Pathorghata and Ghior and 6 Pond sand filters (PSF) of Pathorghata and Gournadi. Microbial contamination were found in 95 percent water samples of DW, 7 percent of DTW, 43 percent of RWHS and 77 percent of PSF. None of DW water sampled in this study had an arsenic concentration higher than the Bangladesh drinking water standard...
Urbanization leads to the construction of various urban infrastructures in the city area for resi... more Urbanization leads to the construction of various urban infrastructures in the city area for residency, transportation, industry, and other purposes, which causes major land use change. Consequently, it substantially affects Land Surface Temperature (LST) by unbalancing the surface energy budget. Higher LST in city areas decreases human thermal comfort for the city dwellers and affects the urban environment and ecosystem. Therefore, a comprehensive investigation is needed to evaluate the impact of land use change on the LST. Remote Sensing (RS) and Geographic Information System (GIS) techniques were used for the detailed investigation. RS data for the years 1993, 2007 and 2020 during summer (March–May) in Dhaka city were used to prepare land cover maps, analyze LST, generate hazard maps and relate the land cover change with LST by using GIS. The results show that the built-up area in Dhaka city increased by 67% from 1993 to 2020 by replacing lowland mainly, followed by vegetation, b...
The Shitalakya River, located near Dhaka City of Bangladesh, supplies water to the city dwellers ... more The Shitalakya River, located near Dhaka City of Bangladesh, supplies water to the city dwellers and hence it is essential to determine pollution condition, ecological risk and sources of heavy metals in the river sediments. Sediment works as the sink and source of heavy metals in the riverine ecosystem. The samples collected from the ten sites of the Shitalakhya River were investigated in the study. Average concentration of different heavy metals in the sediments are Cu>Zn>Ni>Pb>Cr>Cd. Geo-accumulation index reveals moderately pollute Cu concentration , unpolluted to moderately pollute Ni concentration and unpolluted for the rest of the heavy metals. The order of geo-accumulation index are Cu>Ni>Pb>Cd>Zn>Cr. Overall, the heavy metals render low potential ecological risk and the order of potential ecological risk index are Cd>Cu>Ni>Pb>Cr>Zn. Though the concentration of Cd is low in sediment, it poses higher ecological risk. Positive matri...
The effects of increasing temperature and solar radiation due to climate change on the water qual... more The effects of increasing temperature and solar radiation due to climate change on the water quality of the Sitalakhya River were assessed using a water quality model WASP. WASP model was calibrated and verified using primary field data of 2008 and 2009. The predicted weather data of years 2030, 2050, and 2070 from a regional climate model PRECIS were used. The verified model with the existing pollutant loadings of 2009 has been used to assess the impacts of climate change on the water quality of the Sitalakhya river in the dry period of years 2030, 2050 and 2070; only the effects of changing temperature and solar radiation on water quality has been considered in the analysis. Model predicts progressive decrease of ammonia-nitrogen and BOD 5 with the increase of temperature. Predicted ammonia-nitrogen concentrations in the upstream of Kanchan are 3.00, 2.01, 1.40 and 1.37 mg/L for the years 2009, 2030, 2050 and 2070 respectively. Orthophosphate concentration is predicted to decrease due to higher uptake of orthophosphate by phyto-plankton in upper portion of the river but model predicted orthophosphate concentrations near the Saidabad WTP intake are 2.
Journal of Water Supply: Research and Technology—AQUA, 2011
Two pond sand filters (PSFs) with modified design were constructed in Pathorghata Upazila of Barg... more Two pond sand filters (PSFs) with modified design were constructed in Pathorghata Upazila of Barguna District located in southern Bangladesh. Performance assessment of the PSFs was done after commissioning in terms of quality of filtered water, ease of operation and maintenance, monthly check-up of production capacity/efficiency of the filters, users' participation and acceptability of the modified PSFs. Some important parameters such as total coliform, fecal coliform, turbidity, colour, total suspended solids (TSS), chemical oxygen demand (COD) and pH were measured for the raw water and at the various stages of treatment in order to determine the effectiveness of different units of the PSFs. Close observations were made to assess the removal of turbidity in the roughing/pre-filtration chamber to ensure trouble-free operation of the main filter bed. In combination with roughing filters, the average turbidity and fecal coliform removal efficiency of the sand filters were found to be 76 and 98%, respectively. Filter run of the modified PSFs was also found higher (about 3 months) than the existing PSFs.
About 29 million people are either directly or indirectly exposed to arsenic contamination with v... more About 29 million people are either directly or indirectly exposed to arsenic contamination with varying degre es of risk due to extensive arsenic contamination of the groundwater in the alluvial aquifers of Bangladesh. Considering the urgency and gravity of the problem, alternative water supply options like dugwells (DW), deep tubewells (DTW), pond sand filters (PS F) and rain water harvesting systems (RWHS) are being installed in arsenic affected areas under arsenic mitigation programme. The study aimed at assessing the water quality in both dry and wet seasons, sanitary integrity, functional ity, operation and maintenance and social acceptability of dugwells. The study was conducted on 11 dugwells of Charghat, Dohar and Gazaria. Microbial contaminations were found in 95 percent water samples of DWs. None of DW water sampled in this study had an arsenic concentration higher than the Bangladesh drinking water standard (BDS) of 50 µg/L but arsenic concentrations exceeding the WHO guideline value (WHOGV) of 10 µg/L were found in 35 percent of DWs water samples. Both iron and manganese were present in DW water of Dohar and Gazaria in excess of BDS. Water quality of DWs of Charghat in all respects was found better than DWs of Dohar and Gazaria. Users' satisfaction and social acceptability of the DWs were found area specific depending on the quality and availability of water.
Huge quantities of untreated domestic and industrial wastes are being released everyday in Sitala... more Huge quantities of untreated domestic and industrial wastes are being released everyday in Sitalakhya River, flowing along the eastern side of Dhaka City. The water quality of this river is deteriorating rapidly, especially during the dry season at certain reaches of the river. A onedimensional quasi-steady state water quality model has been developed and calibrated using primary field data. A number of load reduction scenarios have been developed to assess their impacts on the river water quality. The model results indicate that Sitalakhya River water quality near intake point of Saidabad water treatment plant may not improve appreciably through reduction of waste load from a single major point source and even if all the wastewater entering into the river system are treated according to the present national effluent standard, the water quality improvement is not significant during the dry season. A revision of the national standards for disposal of effluents seems necessary.
The adsorption of Eurozol Navy reactive dye was examined by orange and lemon peel powder consider... more The adsorption of Eurozol Navy reactive dye was examined by orange and lemon peel powder considering several parameters as pH, contact time, speed of shaker, temperature and initial dye concentration, single and combined adsorbent dosage. Turbidity and dye extraction parameters also observed. The adsorption obeys both Langmuier and Freundlich isotherm. The removal percentages for orange and lemon peel are 81% and 87% respectively and 91% for combined adsorbent dosages.
This research studied the reduction of pollution load from textile wastewater through COD and col... more This research studied the reduction of pollution load from textile wastewater through COD and color removal using electrocoagulation technique. Experiments were carried out on a laboratory scale using mono-polar two aluminum plate as electrode material with total 32.68 cm2 of reaction area. The electrical potential was 12-24 volts. Inter-electrode spacing was kept at 4 cm. The effects of relevant wastewater characteristics such as pH, and important process variables such as applied voltage and operating time on the chemical oxygen demand (COD) and color removal efficiency has been explored. Maximum removal of COD (86.5%) and color (93.4%) was observed at initial pH of 5, the cell time operation was 60 minutes. These results indicate that electrocoagulation process using aluminum electrodes could be effective for removal of COD and color from textile wastewater.
The study has attempted to observe three models of biogas system using twenty liter plastic conta... more The study has attempted to observe three models of biogas system using twenty liter plastic containers as digesters with Cow Dung (CD) and Poultry Droppings (PYD) organic wastes. The cow dung and poultry dropping were mixed separately with water in a ratio of 1:1 (v/v) and the slurry was properly stirred. Thereafter Treatments A, B, C, D and E were prepared using previously made slurry with the following specific proportions as (100% CD + 0% PYD), (75% CD + 25% PYD), (50% CD + 50% PYD), (25% CD + 75% PYD) and (0% CD + 100% CD). Three replicates were carried out for each sample. The plant consists of the fermentation chamber, the inlet and outlet pipe, the gas pipe and the stirrer. The samples were tested for methane and carbon dioxide productions along with pH and Temperature for 31days. Treatment D which is a mixture of (25% cow dung and 75% poultry droppings) produced more methane than the rest of the treatments. 96.08%. The cumulative methane yields of treatments D, A, C, E and B...
The surface water pollution is considered as one of the most serious environmental problems in mo... more The surface water pollution is considered as one of the most serious environmental problems in most developing countries. Most of the rivers in the urban areas of the developing world are the end points of effluents discharged from the industries and domestic sources. In Dhaka, huge quantities of untreated domestic and industrial wastes are being released everyday in the Sitalakhya river, flowing along the eastern side of the city. The water quality of this river is deteriorating rapidly, especially during dry season at certain reaches of the river. The Saidabad water treatment plant, which draws water from the Sitalakhya river near Sarulia (around 400m downstream of its confluence with heavily polluted Balu river), is facing serious problems in treating water due to poor raw water quality, especially due to the presence of excessive ammonia and algae at the intake areas during the dry season. In this study, the present status of water quality of the Sitalakhya river, Balu river, To...
Arsenic contamination in groundwater and its toxic effect on human health is a major public healt... more Arsenic contamination in groundwater and its toxic effect on human health is a major public health problem in Bangladesh. There are 270 arsenic prone upazillas in the country and the total population exposed to arsenic contamination has been estimated as 24.5 million (around 19 percent of total population). Among 4.95 million tube wells in the 270 upazillas, 29 percent tubewells are contaminated with arsenic. The number of arsenicosis patients has come out as 38,430. Given the fact that any effective treatment for arsenicosis is yet to be developed, supply of arsenic safe drinking and cooking water to the population exposed to arsenic contamination is the principal way of mitigating the problem. Considering the urgency and gravity of the problem, alternative water supply options like dug wells(DW), deep tubewells(DTW), pond sand filters(PSF) and rain water harvesting systems(RWHS) are being installed in arsenic affected areas under arsenic mitigation programme. The study aimed at as...
The adsorption of Eurozol Navy reactive dye was examined by orange and lemon peel powder consider... more The adsorption of Eurozol Navy reactive dye was examined by orange and lemon peel powder considering several parameters as pH, contact time, speed of shaker, temperature and initial dye concentration, single and combined adsorbent dosage. Turbidity and dye extraction parameters also observed. The adsorption obeys both Langmuier and Freundlich isotherm. The removal percentages for orange and lemon peel are 81% and 87% respectively and 91% for combined adsorbent dosages.
The environment of Dhaka city is depraving gradually day by day because of unplanned urbanization... more The environment of Dhaka city is depraving gradually day by day because of unplanned urbanization, destruction of greeneries by increasing building and economical activities areas to meet the demand of migrated people. This scenario is enhancing the negative change in climate gradually. It is one of the main causes of Buriganga river pollution because of climate change impact. Dhaka city is capital of Bangladesh, which largely depends on the Buriganga River‘s water for drinking, fishing, carrying merchandise and transportation. The quality of water in this river was very poor and the average DO, BOD5, COD, Nitrate and Phosphate concentration in mg/L were 1.11, 82.3, 148.45, 5.92 and 5.83 respectively. This study mainly focused the climate change impact in term of rainfall on Buriganga River and disclosed it that decreasing the rate of rainfall affect the discharge of river because of climate change and increasing the rate of waste water because of incremental economical activities i...
About 29 million people are either directly or indirectly exposed to arsenic contamination with v... more About 29 million people are either directly or indirectly exposed to arsenic contamination with varying degrees of risk due to extensive arsenic contamination of the groundwater in the alluvial aquifers of Bangladesh. Considering the urgency and gravity of the problem, alternative water supply options like dugwells (DW), deep tubewells (DTW), pond sand filters (PSF) and rain water harvesting systems (RWHS) are being installed in arsenic affected areas under arsenic mitigation programme. The study aimed at assessing the water quality in both dry and wet seasons, sanitary integrity, functional ity, operation and maintenance and social acceptability of dugwells. The study was conducted on 11 dugwells of Charghat, Dohar and Gazaria. Microbial contaminations were found in 95 percent water samples of DWs. None of DW water sampled in this study had an arsenic concentration higher than the Bangladesh drinking water standard (BDS) of 50 μg/L but arsenic concentrations exceeding the WHO guide...
Arsenic contamination in groundwater and its toxic effect on human health is a major public healt... more Arsenic contamination in groundwater and its toxic effect on human health is a major public health problem in Bangladesh and it is emphasized in the national level to use alternative water sources for drinking water to mitigate the arsenic problem. To identify reasons of nonfunctioning and in order to develop a comparative information and better understanding of the options, assessment of alternative water supply options in both technical and social aspects are essential. The study was conducted on 11 Dug wells (DW) of Charghat, Dohar and Gazaria, 9 Deep hand tubewells (DTW) of Dohar and Gournadi, 17 Rain water harvesting systems (RWHS) of Charghat, Gournadi, Pathorghata and Ghior and 6 Pond sand filters (PSF) of Pathorghata and Gournadi. Microbial contamination were found in 95 percent water samples of DW, 7 percent of DTW, 43 percent of RWHS and 77 percent of PSF. None of DW water sampled in this study had an arsenic concentration higher than the Bangladesh drinking water standard...
Urbanization leads to the construction of various urban infrastructures in the city area for resi... more Urbanization leads to the construction of various urban infrastructures in the city area for residency, transportation, industry, and other purposes, which causes major land use change. Consequently, it substantially affects Land Surface Temperature (LST) by unbalancing the surface energy budget. Higher LST in city areas decreases human thermal comfort for the city dwellers and affects the urban environment and ecosystem. Therefore, a comprehensive investigation is needed to evaluate the impact of land use change on the LST. Remote Sensing (RS) and Geographic Information System (GIS) techniques were used for the detailed investigation. RS data for the years 1993, 2007 and 2020 during summer (March–May) in Dhaka city were used to prepare land cover maps, analyze LST, generate hazard maps and relate the land cover change with LST by using GIS. The results show that the built-up area in Dhaka city increased by 67% from 1993 to 2020 by replacing lowland mainly, followed by vegetation, b...
The Shitalakya River, located near Dhaka City of Bangladesh, supplies water to the city dwellers ... more The Shitalakya River, located near Dhaka City of Bangladesh, supplies water to the city dwellers and hence it is essential to determine pollution condition, ecological risk and sources of heavy metals in the river sediments. Sediment works as the sink and source of heavy metals in the riverine ecosystem. The samples collected from the ten sites of the Shitalakhya River were investigated in the study. Average concentration of different heavy metals in the sediments are Cu>Zn>Ni>Pb>Cr>Cd. Geo-accumulation index reveals moderately pollute Cu concentration , unpolluted to moderately pollute Ni concentration and unpolluted for the rest of the heavy metals. The order of geo-accumulation index are Cu>Ni>Pb>Cd>Zn>Cr. Overall, the heavy metals render low potential ecological risk and the order of potential ecological risk index are Cd>Cu>Ni>Pb>Cr>Zn. Though the concentration of Cd is low in sediment, it poses higher ecological risk. Positive matri...
The effects of increasing temperature and solar radiation due to climate change on the water qual... more The effects of increasing temperature and solar radiation due to climate change on the water quality of the Sitalakhya River were assessed using a water quality model WASP. WASP model was calibrated and verified using primary field data of 2008 and 2009. The predicted weather data of years 2030, 2050, and 2070 from a regional climate model PRECIS were used. The verified model with the existing pollutant loadings of 2009 has been used to assess the impacts of climate change on the water quality of the Sitalakhya river in the dry period of years 2030, 2050 and 2070; only the effects of changing temperature and solar radiation on water quality has been considered in the analysis. Model predicts progressive decrease of ammonia-nitrogen and BOD 5 with the increase of temperature. Predicted ammonia-nitrogen concentrations in the upstream of Kanchan are 3.00, 2.01, 1.40 and 1.37 mg/L for the years 2009, 2030, 2050 and 2070 respectively. Orthophosphate concentration is predicted to decrease due to higher uptake of orthophosphate by phyto-plankton in upper portion of the river but model predicted orthophosphate concentrations near the Saidabad WTP intake are 2.
Journal of Water Supply: Research and Technology—AQUA, 2011
Two pond sand filters (PSFs) with modified design were constructed in Pathorghata Upazila of Barg... more Two pond sand filters (PSFs) with modified design were constructed in Pathorghata Upazila of Barguna District located in southern Bangladesh. Performance assessment of the PSFs was done after commissioning in terms of quality of filtered water, ease of operation and maintenance, monthly check-up of production capacity/efficiency of the filters, users' participation and acceptability of the modified PSFs. Some important parameters such as total coliform, fecal coliform, turbidity, colour, total suspended solids (TSS), chemical oxygen demand (COD) and pH were measured for the raw water and at the various stages of treatment in order to determine the effectiveness of different units of the PSFs. Close observations were made to assess the removal of turbidity in the roughing/pre-filtration chamber to ensure trouble-free operation of the main filter bed. In combination with roughing filters, the average turbidity and fecal coliform removal efficiency of the sand filters were found to be 76 and 98%, respectively. Filter run of the modified PSFs was also found higher (about 3 months) than the existing PSFs.
About 29 million people are either directly or indirectly exposed to arsenic contamination with v... more About 29 million people are either directly or indirectly exposed to arsenic contamination with varying degre es of risk due to extensive arsenic contamination of the groundwater in the alluvial aquifers of Bangladesh. Considering the urgency and gravity of the problem, alternative water supply options like dugwells (DW), deep tubewells (DTW), pond sand filters (PS F) and rain water harvesting systems (RWHS) are being installed in arsenic affected areas under arsenic mitigation programme. The study aimed at assessing the water quality in both dry and wet seasons, sanitary integrity, functional ity, operation and maintenance and social acceptability of dugwells. The study was conducted on 11 dugwells of Charghat, Dohar and Gazaria. Microbial contaminations were found in 95 percent water samples of DWs. None of DW water sampled in this study had an arsenic concentration higher than the Bangladesh drinking water standard (BDS) of 50 µg/L but arsenic concentrations exceeding the WHO guideline value (WHOGV) of 10 µg/L were found in 35 percent of DWs water samples. Both iron and manganese were present in DW water of Dohar and Gazaria in excess of BDS. Water quality of DWs of Charghat in all respects was found better than DWs of Dohar and Gazaria. Users' satisfaction and social acceptability of the DWs were found area specific depending on the quality and availability of water.
Huge quantities of untreated domestic and industrial wastes are being released everyday in Sitala... more Huge quantities of untreated domestic and industrial wastes are being released everyday in Sitalakhya River, flowing along the eastern side of Dhaka City. The water quality of this river is deteriorating rapidly, especially during the dry season at certain reaches of the river. A onedimensional quasi-steady state water quality model has been developed and calibrated using primary field data. A number of load reduction scenarios have been developed to assess their impacts on the river water quality. The model results indicate that Sitalakhya River water quality near intake point of Saidabad water treatment plant may not improve appreciably through reduction of waste load from a single major point source and even if all the wastewater entering into the river system are treated according to the present national effluent standard, the water quality improvement is not significant during the dry season. A revision of the national standards for disposal of effluents seems necessary.
The adsorption of Eurozol Navy reactive dye was examined by orange and lemon peel powder consider... more The adsorption of Eurozol Navy reactive dye was examined by orange and lemon peel powder considering several parameters as pH, contact time, speed of shaker, temperature and initial dye concentration, single and combined adsorbent dosage. Turbidity and dye extraction parameters also observed. The adsorption obeys both Langmuier and Freundlich isotherm. The removal percentages for orange and lemon peel are 81% and 87% respectively and 91% for combined adsorbent dosages.
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