摘要
目前市政污水处理厂多关注水质排放标准中规定参数的阈值而忽略药品和个人护理用品(PPCPs)等新型微污染物。厌氧消化是污水处理厂实现碳中和与剩余污泥资源化利用的关键技术,而剩余污泥中积累的PPCPs会限制厌氧消化及其残余物资源化技术的推广。本研究分析了市政污水处理厂PPCPs来源与行为,以频繁检出的典型PPCPs为研究对象,解析了实验室环境下中高浓度的PPCPs对厌氧消化性能潜在影响;综述了典型PPCPs对消化过程中关键参数如甲烷产率、挥发酸分布和微生物群落结构的影响;同时评价了PPCPs对剩余污泥厌氧消化的后风险。结果表明:典型PPCPs能够促进污泥溶解,为微生物提供更多的营养物质,而水解酸化细菌因PPCPs胁迫而过度活跃导致挥发酸过度积累;与氢营养型产甲烷菌相比,乙酸型产甲烷菌更易受到PPCPs抑制,从而降低甲烷产率;厌氧消化沼渣和沼液资源化利用的同时PPCPs也会带来潜在的生态风险。未来研究应从细胞水平加深理解PPCPs暴露对细菌和古菌的影响,开发既可满足污水水质排放标准、又能缓解PPCPs对厌氧消化的潜在抑制的新工艺,加速污水处理厂碳中和进程,降低PPCPs生态风险。
Presently,the municipal wastewater treatment plants(WWTPs) only focus on the thresholds of the parameters specified in the wastewater quality discharge standards without considering new micro-pollutants such as pharmaceutical and personal care products PPCPs. Anaerobic digestion(AD) is a vital technology for achieving carbon neutral and excess sludge resource utilization in WWTPs,and the accumulation of PPCPs in sewage sludge would limit the technology promotion of the AD and resource utilization of residue. The sources and behaviors of PPCPs in WWTPs were briefly described,and the potential effects of high concentration PPCPs on AD performance were revealed with typical PPCPs frequently detected in WWTPs. The effects of typical PPCPs on key parameters including methane(CH4)yield,volatile acid distribution and microbial community in AD process were reviewed. Meanwhile,the post risk of PPCPs on AD of excess sludge was evaluated. The results showed that the typical PPCPs could promote sludge dissolution to provide more nutrients to microbes,while hydrolytic acidifying bacteria were hyperactivated by the stress of PPCPs,thus causing excess accumulation of volatile acids. Aceticlastic methanogens were more vulnerable to the inhibition of PPCPs compared with hydrogenotrophic methanogens,resulted in lower CH4yield. And the resource utilization of biogas residue and slurry produced by AD along with PPCPs could pose potentially ecological risks. In the future research,the understanding of the exposure of PPCPs on bacteria and archaea should be deepened at the cellular level,and to develop new process that could both meet the effluent water quality discharge standards,alleviate the potential inhibition of AD by PPCPs,accelerate the carbon neutralization process in WWTPs and reduce the ecological risk of PPCPs.
作者
王江梅
杨俊伟
刘慧
裴勇
田可心
张记市
WANG Jiangmei;YANG Junwei;LIU Hui;PEI Yong;TIAN Kexin;ZHANG Jishi(Shandong Weifang Ecological Environment Monitoring Center,Weifang,Shandong 261041;College of Environmental Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan Shandong 250353;Shandong Bluetown Analysis&Test Co.Ltd.,Jinan Shandong 250101)
出处
《环境卫生工程》
2022年第5期14-25,30,共13页
Environmental Sanitation Engineering
基金
山东省自然科学基金项目(ZR2016EEM33)
齐鲁工业大学(山东省科学院)科教产融合创新试点工程项目(2020KJC-ZD12)。
关键词
药品和个人护理用品
污水处理厂
剩余污泥
厌氧消化
环境与安全风险
pharmaceutical and personal care products
wastewater treatment plants
surplus sludge
anaerobic digestion
environmental and safety risks
