Mathematical Modeling of Distillery Wastewater Biomethanation in Fluidized-bed Bioreactor

S. M. Hossain, M. Das
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引用次数: 1

Abstract

An anaerobic fluidized- bed reactor was designed to treat distillery wastewaters for biogas generation using actively digested aerobic sludge of a sewage plant. The optimum digestion time was 8 h and optimum initial pH of feed was observed as 7.5 respectively. The optimum temperature of feed was 40°C and optimum feed flow is 14 L/ min with maximum OLR was 39.513 kg COD m -3 h -1 respectively. The OLR was calculated on the basis of COD inlet in the bioreactor at di erent flow rates. Maximum CH 4 gas concentration was 63.56 % (v/v) of the total (0.835 m 3 /kg COD m -3 h -1 ) biogas generation, corresponding to 0.530 m 3 /kg COD m -3 h -1 at optimum digestion parameters. Maximum COD and BOD reduction of the distillery wastewaters were 76.82% (w/w) and 81.65% (w/w) with maximum OLR of 39.513 kg COD m -3 h -1 at optimum conditions respectively. The rate constant ( k ) was measured as 0.31 h -1 in fluidized-bed bioreactor and followed a first order rate equation. The specific growth rate ( μ ) was 0.99 h -1 and maximum sp. growth rate ( μ max ) was 1.98 h -1 respectively. The bacterial yield coefficient ( Y ) was determined as 0.319 /kg COD m -3 h -1 at optimum parameters. The studies also dealt with the mathematical modeling of the experimental data on biomethanation and suggested modeling equations relating to kinetic parameter (rate constant, k ), maximum specific growth rate ( μ max ) with respect to COD (substrate) removal. The mathematical model was also analyzed for hydrodynamic pressure ( Δp ) vs feed flow ( u ) and hydrodynamic pressure ( Δp ) with respect to CH 4 gas yields. The linear and non-linear equations which fitted the models were obtained. Keywords: Biomethanation, anaerobic, optimum condition, modeling DOI = 10.3329/cerb.v14i1.4224 Chemical Engineering Research Bulletin 14 (2010) 37-43
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流化床生物反应器中蒸馏废水生物甲烷化的数学建模
设计了厌氧流化床反应器,利用某污水厂活性消化好氧污泥处理蒸馏废水产沼气。最佳消化时间为8 h,饲料初始pH为7.5。最佳进料温度为40℃,最佳进料流量为14 L/ min,最大OLR为39.513 kg COD m -3 h -1。OLR是根据不同流量下生物反应器的COD进水量来计算的。在最佳消化参数下,最大甲烷气体浓度为总沼气(0.835 m 3 /kg COD m -3 h -1)的63.56% (v/v),对应于0.530 m 3 /kg COD m -3 h -1。在最佳工艺条件下,蒸馏废水COD和BOD的最大降幅分别为76.82% (w/w)和81.65% (w/w),最大OLR分别为39.513 kg COD m -3 h -1。在流化床生物反应器中测定的速率常数(k)为0.31 h -1,符合一级速率方程。比生长速率(μ)为0.99 h -1,最大sp生长速率(μ max)为1.98 h -1。在最佳工艺条件下,细菌产量系数为0.319 /kg COD m -3 h -1。研究还处理了生物甲烷化实验数据的数学建模,并提出了与动力学参数(速率常数,k)、最大特定生长速率(μ max)有关的COD(底物)去除的建模方程。还分析了动水压力(Δp)与进料流量(u)和动水压力(Δp)对甲烷产气量的数学模型。得到了与模型拟合的线性和非线性方程。关键词:生物甲烷化,厌氧,最佳条件,建模DOI = 10.3329/cerb.v14i1.4224化工研究通报14 (2010)37-43
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