Quantification and kinetic characterization of soluble microbial products from municipal wastewater treatment plants
Quantification and kinetic characterization of soluble microbial products from municipal wastewater treatment plants
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城市污水处理厂可溶性微生物产物的定量和动力学表征
DOI：
10.1016/j.watres.2015.10.065
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发表时间：
2016
期刊：
影响因子：
12.8
通讯作者：
Yu Han-Qing
中科院分区：
文献类型：
--
作者：
Xie Wen-Ming;Ni Bing-Jie;Sheng Guo-Ping;Seviour Thomas;Yu Han-Qing
废水处理厂（WWTP）中微生物形成的可溶性微生物产物（SMP）会对最终出水水质和处理效率产生不利影响。很难将 SMP 与处理过程中可能持续存在的进水中残留的蛋白质、脂质和碳水化合物区分开来。目前还没有方法可以定量确定 SMP 对城市污水处理厂有机排放的影响程度。在这项工作中，提出了一种建模方法，可以量化和描述市政污水处理厂废水中的 SMP 部分。使用市政污水处理厂的进水，该模型在利用相关产品、生物质相关产品和细胞外聚合物方面进行了验证。研究发现，SMP 平均产生 27 毫克/升的化学需氧量 (COD)，即污水处理厂废水中总 COD 的 61%。超过 90% 的 SMP 由生物质相关产品组成。评估了影响污水处理厂SMP形成的五个主要因素。废水成分和混合液悬浮固体浓度均未发现影响 SMP 生产。另一方面，观察到 SMP 形成与固体保留时间和进水 COD 浓度呈正相关，与水力保留时间呈负相关。因此，运行或设计具有短固体保留和长水力保留时间的污水处理厂可被视为最小化SMP产量的解决方案。
Soluble microbial products (SMP) formed by microorganisms in wastewater treatment plants (WWTPs) adversely affect final effluent quality and treatment efficiency. It is difficult to distinguish SMP from residual proteins, lipids and carbohydrates present in the influent that may persist during treatment. No method is currently available to determine quantitatively the extent to which SMP contribute to organic discharges from municipal WWTPs. In this work a modeling approach is presented which allows the SMP fraction of the effluent of a municipal WWTP to be quantified and described. The model is validated, in terms of utilization-associated products, biomass-associated products and extracellular polymeric substances, using influent from a municipal WWTP. SMP was found to account for, on average, 27 mg/L of chemical oxygen demand (COD), or 61% of the total COD in the WWTP effluent. Over 90% of the SMP was comprised of biomass-associated products. Five main factors influencing SMP formation in WWTP were evaluated. Neither wastewater composition nor mixed liquor suspended solids concentration was found to affect SMP production. On the other hand, a positive correlation was observed for SMP formation with both solids retention time and influent COD concentration, and a negative correlation with hydraulic retention time. Thus, operating or designing WWTPs with short solids retention and long hydraulic retention times could be considered as solutions for minimizing SMP production.