期刊
WATER RESEARCH
卷 88, 期 -, 页码 703-710出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2015.10.065
关键词
Activated sludge; Chemical oxygen demand (COD); Effluent; Microorganisms; Soluble microbial products (SMP); Wastewater treatment plant (WWTP)
资金
- Key Special Program on the S&T for the Pollution Control [2012ZX07103-001, 2011ZX07303-002-04]
- NSFC [21261160489, 51408587, 51538011]
- Program for Changjiang Scholars and Innovative Research Team in University
- Collaborative Innovation Center of Suzhou Nano Science and Technology of the Ministry of Education of China
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. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据