基于活性污泥模型的污水COD组分划分方案研究

活性污泥数学模型(ASM)在污水处理厂的成功应用与进水组分的正确划分密切相关.从标准化和定量化的角度利用3个批式试验开发了COD组分划分方案及Matlab计算程序.该方案在上海2个污水处理厂的测定结果表明,曲阳污水厂进水COD中含有8.1%±1.6%的易生物降解组分SS、6.3%±2.2%的溶解性惰性组分SI、45.5%±3.5%的慢速生物降解组分XS、31.1%±2.1%的颗粒性惰性组分XI和9.0%±1.1%的异养菌组分XH.而白龙港污水厂进水COD中含有11.1%±2.2%的SS、9.9%±2.0%的SI、38.9%±10.7%的XS、23.3%±9.8%的XI和16.9%±1.8%的XH.与曲阳污水厂相比,白龙港污水厂进水COD中XS和XI含量偏低,而XH/COD值则明显偏高,表明长距离管道输送会显著影响COD组分浓度.

Activated Sludge Model Based COD Fractionation in Wastewater Characterization

The successful application of activated sludge model (ASM) in wastewater treatment plant mainly depends on the correctness of wastewater fractionation. Based on three batch oxygen uptake rate (OUR) tests, a COD fractionation protocol and the corresponding Matlab program were developed to aid the standardization of COD fractionation in wastewater. COD fractionation results of two wastewater treatment plants (WWTP) in Shanghai show that COD in wastewater of the Quyang WWTP is composed of 8.1%±1.6% readily biodegradable COD (S_S), 6.3%±2.2% soluble inert COD (S_I), 45.5%±3.5% slowly biodegradable COD (X_S), 31.1%±2.1% particulate inert COD (X_I) and 9.0%±1.1% heterotrophic biomass (X_H), and those fractions in wastewater of the Bailonggang WWTP are 11.1%±2.2%, 9.9%±2.0%, 38.9%±10.7%, 23.3%±9.8% and 16.9%±1.8%, respectively. Compared to the Quyang WWTP, wastewater of the Bailonggang WWTP showed lower X_Sand X_I contents in COD, but greatly higher X_H/COD value, indicating that long pipeline transportation could significantly influence the concentration of COD fractions.