长江三角洲地区污水污泥与健康安全风险研究Ⅰ.粪大肠菌群数及其潜在环境风险
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* 国家重点基础研究发展规划(973)项目(2002CB4108010);中国科学院知识创新工程重要方向项目(KZCX3-SW-429)资助


SEWAGE SLUDGES AND RISKS TO HEALTH AND SAFETY IN YANGTZE RIVER DELTA Ⅰ. FECAL COLIFORM AND ITS POTENTIAL ENVIRONMENTAL RISKS
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    粪大肠菌群(Fecal Coliform,FC)是判定污泥土地安全利用的重要指标之一。通过实地调查取样,收集了长江三角洲地区的南京、苏州、上海、杭州等15个城市的污水处理厂的48份污泥样品,测定了其粪大肠菌群数,旨在了解污泥中FC的数量与潜在污染风险;并在污泥自然风干过程的第7、14、21、28天分别取样测定了FC的数量和水分含量,以观察风干过程中FC和水分的动态变化及其与风干时间的关系。研究结果表明,污泥中FC的最大可能数(MPN)的范围在0~3.41×106(MPNg-1,DW),平均为3.79×105(MPNg-1,DW),检出率达89.6%。不同类型污泥中FC的数量差别较大,“河流”污水处理厂污泥和污泥制品的FC数量最低,以生活污水为主的污泥和混流污水污泥中FC数量较高。污泥风干过程中FC数量和水分含量均随风干时间的延长而减少,但FC数量有回升现象。总之,污泥样品的FC数量差异较大,部分污泥样品的数量超过了污泥农用的病原物标准,为了保护生态环境和人类健康,防止二次污染,污泥土地利用时需考虑FC数量,采取相应控制措施。

    Abstract:

    Fecal Coliform (FC) is an indicator pathogen for evaluating safety of land application of sewage sludge In the present study, forty-eight sewage sludge samples were collected from 15 cities in the Yangtze River Delta region Both FC and water content were determined in the fresh samples and in some selected samples when being air-dried for 7, 14, 21 and 28 days, respectively, in order to investigate counts of FC in the sludges, their pollution risks and dynamics following air-drying The results show that the counts of FC in the sludges ranged from 0 to 3.41×106 (MPN g-1, DW), with an average of 3.79×105 (MPN g-1, DW) FC was found in 89.6% of the samples River sludges and products thereof were much lower in FC count than the domestic and domestic industrial mixed sewage sludges The counts of FC dropped markedly at first with the time of air-drying but rebounded after 3~4 weeks It can be concluded that majority of the sewage sludges from wastewater treatment plants in the Yangtze River Delta region had pathogenic bacteria, but their counts varied with the wastewater sources, treatments and sludge disposals FC in some sewage sludges exceeded a guidance level of 2×106 (MPN g-1, DW), indicating potential risk to eco-environmental safety and public health upon land application without appropriate pasteurization.

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孙玉焕,骆永明,吴龙华,滕应,宋静,钱薇,李振高.长江三角洲地区污水污泥与健康安全风险研究Ⅰ.粪大肠菌群数及其潜在环境风险[J].土壤学报,2005,42(3):397-403. DOI:10.11766/trxb200406070308 Sun Yuhuan, Luo Yongming, Wu Longhua, Teng Ying, Song Jing, Qian Wei, Li Zhengao. SEWAGE SLUDGES AND RISKS TO HEALTH AND SAFETY IN YANGTZE RIVER DELTA Ⅰ. FECAL COLIFORM AND ITS POTENTIAL ENVIRONMENTAL RISKS[J]. Acta Pedologica Sinica,2005,42(3):397-403.

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  • 收稿日期:2004-06-07
  • 最后修改日期:2004-12-21
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  • 在线发布日期: 2013-02-25
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