天津市某污水处理厂出水中贾第虫和隐孢子虫含量及其潜在健康危害

发布时间：2018-10-22 14:49

【摘要】：[目的]了解天津某郊野公园补给河流纳入的处理后污水中贾第虫和隐孢子虫(简称"两虫")的浓度水平及其对人群潜在的健康危害。[方法]于2014年3—7月每2周对补给河流上游A污水处理厂出水进行采集,共采集9份样品。水样经沉淀浓缩、密度梯度纯化、免疫荧光染色后经荧光显微镜检测"两虫",测定其浓度。采用定量微生物风险评价法对人群通过绿地灌溉和湖泊玩耍暴露于"两虫"的潜在健康危害进行评价。[结果]出水中均能检测出"两虫",其中浓度范围分别为11~53包囊/L和0~20卵囊/L。在常规氯消毒后排放时,贾第虫和隐孢子虫的年感染概率分别为5.69×10-3和2.46×10-3,均高于美国环境保护署地表水处理法规定的1.0×10-4。若采用紫外线或臭氧进行消毒,其感染"两虫"的概率为2.75×10-5。[结论]A污水处理厂出水中均能检出"两虫",其浓度水平与国内外报道的污水处理厂相当。处理后的水经氯消毒后排放至河流经灌溉绿地或湖泊玩耍接触人群,存在感染"两虫"的潜在健康危害。出厂水若采用紫外线或臭氧消毒则可降低"两虫"对人群的健康危害。
[Abstract]:[objective] to understand the concentrations of Giardia giardia and Cryptosporidium in treated sewage from a recharge river in a country park in Tianjin and their potential health hazards to the population. [methods] from March to July, 2014, the effluent from A sewage treatment plant upstream of the recharge river was collected every 2 weeks, and 9 samples were collected. The water samples were concentrated by precipitation, purified by density gradient, and detected by fluorescence microscope after immunofluorescence staining. A quantitative microbial risk assessment method was used to evaluate the potential health hazards of population exposed to "two insects" through greenbelt irrigation and lake play. [results] "two insects" could be detected in the effluent, in which the concentration ranges were 1153 cyst / L and 0 ~ 20 oocyst / L. The annual infection rates of Giardia lamblia and Cryptosporidium were 5.69 脳 10 ~ (-3) and 2.46 脳 10 ~ (-3), respectively, which were higher than 1.0 脳 10 ~ (-4) by the surface water treatment method of the United States Environmental Protection Agency. If ultraviolet or ozone was used to sterilize, the probability of infection was 2.75 脳 10 ~ (- 5). [conclusion] "two insects" can be detected in the effluent of sewage treatment plant A, and the concentration level is similar to that reported at home and abroad. The treated water was disinfected with chlorine and then discharged into the river to flow through the irrigated green space or the lake to play in contact with the crowd, which had the potential health hazard of infection with the "two insects". UV or ozone disinfection in factory water can reduce the health hazard of the two insects.
【作者单位】：天津城建大学环境与市政工程学院;天津市水质科学与技术重点实验室;
【基金】：国家自然科学基金(编号:51278174) 天津城建大学科研启动基金(编号:70-1302) 天津市“131”第二层次人才培养计划项目
【分类号】：R123.1

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