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Hossain S.M.,Center for Advanced Studies and Research
Indian Journal of Environmental Protection | Year: 2011

The pollution loads (COD and BOD) and colour removal of black liquor using activated spherical carbon prepared from neem oil cake as adsorbent was studied in continuous stirred batch reactor. Optimum parameters were: Contact time, 80 min; adsorbent dosage, 20 g/L; adsorbent size, 8×10 -3 m; pH, 5.5 and stirring speed, 50 rpm. Maximum COD and BOD reduction from black liquor wastewaters were observed as 91.35% (w/w) and 93.56% (w/w) at optimum parameters. Maximum colour removal from black liquor was 89.62% (OD at 465 nm) at optimum conditions. The Langmuir and Freundlich, isotherms had been applied for the study. The adsorption models were fitted reasonably well with experimental data for treatment of black liquor with activated spherical carbon prepared from neem oil cake. © 2011 - Kalpana Corporation. Source


Hossain S.M.,Center for Advanced Studies and Research
Indian Journal of Environmental Protection | Year: 2013

The product range covered by the petrochemical industry excludes major materials, like ammonium phosphate and urea; minor materials, like sulphuric acid, ammonia, phosphoric acid are manufactured as intermediate. The process of manufacturing of caprolactum in M/s Fertilizers and Chemical of Travancore Ltd., (FACT) involves the use of organic chemicals, like benzene, cyclohexane, cyclohexanone and cyclohexanol and inorganic chemicals, like hydroxylamine sulphate, oleum, ammonium sulphate and ammonium carbonate, etc. Many variable parameters of the activated sludge process, such as differences in inflow rate (Q), air flow rates, mixed liquor suspended solid (MLSS) concentration, hydraulic retention time (HRT), solid retention time (SRT), chemical oxygen demand (COD) and biochemical oxygen demand (BOD) loading rates are some of the distinguished characteristics of the process, making them more suitable for one application than other. Attempts were made in the aerobic activated sludge process design to optimize parameters, such as SRT, MLSS, HRT and air flow rates to obtain maximum BOD and COD removal from petrochemical industry effluents. © 2013 - Kalpana Corporation. Source


Hossain S.M.,Center for Advanced Studies and Research
Indian Journal of Environmental Protection | Year: 2011

The aerobic pollution load (COD and BOD) removal of spent sulphite liquor using activated porous spherical charcoal prepared from neem oil cake both as adsorbent and fluidizing particle was studied in a fluidized- bed reactor. Optimum operating parameters were: Operating time, 8 hr; adsorbent dosage, 35 g; adsorbent size, 8′ 10 -3 m; pH, 5.5; temperature, 50 °C and feed flow, 10 L/ min. Maximum COD and BOD reduction from spent sulphite liquor wastewaters were observed as 85.76% (w/w) and 88.39% (w/w) at optimum parameters. © 2011 - Kalpana Corporation. Source


Hossain M.,Center for Advanced Studies and Research
Indian Journal of Environmental Protection | Year: 2010

An anaerobic fluidized- bed bioreactor is designed to treat distillery wastewaters and simultaneous H 2 gas production using actively digested aerobic sewage sludge. The optimum digestion time is 8 hr and optimum initial pH of feed is observed as 5.5, respectively. The optimum temperature of feed is 35 °C and optimum feed flow is 14 L/min with maximum organic loading rate (OLR) is 39.513 kg COD/m 3/hr, respectively. The maximum H 2 gas concentration is 58.25% (v/v) at optimum biohydrogenation process parameters. The maximum H 2 gas yield rate is 0.764 m 3 /kg COD/m 3/hr. The maximum COD and BOD reduction of the distillery wastewaters are 76.78% (w/w) and 79.38% (w/w) with maximum OLR of 39.513 kg COD/m 3/hr at optimum conditions, respectively. The studies deal with the mathematical modeling of the experimental data on biohydrogenation and suggest model equations relating kinetic parameter (rate constant, k), maximum specific growth rate (μ max) with respect to COD (substrate) removal for performance of fluidized-bed reactor. The mathematical modeling is also analyzed for hydrodynamic pressure (Δp) vs feed flow (u) and hydrodynamic pressure (Ap) with respect to H 2 gas yields. © 2011-Kalpana Corporation. Source


Hossain S.M.,Center for Advanced Studies and Research
Indian Journal of Environmental Protection | Year: 2010

The pollution removal load (COD and BOD) of rubber processing industry wastewaters using activated porous spherical carbon prepared from mustard oil cake both as adsorbent and fluidizing particle was studied in a fluidized- bed reactor. The optimum adsorbent dosage was 35g and optimum adsorbent size was 5x10 -3 m, respectively. The optimum operating time was 6 hr and optimum initial pH of feed was observed as 5.5, respectively. The optimum temperature of feed was 45 °C and optimum feed flow was 10 L/min, respectively. Maximum COD and BOD reduction of rubber processing industry wastewaters were 93.56% (w/wl and 94.78% (w/w) at optimum parameters, respectively. The optimization of these parameters enables a stable functioning of the fluidized- bed reactor and allows the application of high effluent loading rates. © 2011-Kalpana Corporation. Source

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