[Occurrence and Removal of N-nitrosamines in the Wastewater Treatment Plants Using Different Treatment Processes].

流出物 废水 污水处理 环境科学 污染物 污水 地表水 环境工程 污染 工业废水处理 环境化学 化学 生态学 生物 有机化学
作者
Wang-Rong Liu,Jiang-Liang Zhao,Yuanyuan Yang,Yao Li,You-Sheng Liu,Guang‐Guo Ying
出处
期刊:PubMed 卷期号:40 (7): 3233-3241
标识
DOI:10.13227/j.hjkx.201812132
摘要

This study measured the concentrations of six N-nitrosamines (NAs) in water samples from each process stage of three wastewater treatment plants (WWTPs) and their corresponding receiving rivers. The occurrence and removal of NAs was then systematically studied in three WWTPs using different treatment processes, and their pollution profiles and sources in the receiving rivers were analyzed. The results showed that the six NAs occurred widely in the wastewater from every process stage of three WWTPs. NPIP, NDMA, and NPYR were the dominant pollutants with concentrations in the tens to hundreds ng·L-1. The three WWTPs using different treatment processes removed a certain amount of NAs, and the modified A2/O and A2/O+MBR showed good NAs removal effects, with total removal rates of 95% and 63%, respectively. The removal of NAs mainly relied on microbial degradation and transformation during the biochemical stage. During the filtration, disinfection, and MBR stages, NAs precursors in the wastewater treatment system could form some added NAs after a series of reactions. The six NAs were also frequently detected in the surface waters of receiving rivers, where the main pollutants were also MDMA, NPIP, and NPYR, which was consistent with the influent of the WTTPs. The sources of NAs in the receiving rivers were wide ranging and complicated, including emission from the effluent of the WTTPs, the release of untreated sanitary sewage, industrial wastewater, and surface runoff from industrial districts. Therefore, effective measures should be taken to reduce the input of NAs into receiving rivers, such as enhancing the capacity of sewage collection and treatment and optimizing sewage treatment processes.
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