施污泥土壤中粪大肠菌群的动态变化及其环境卫生风险  

Dynamic Change of Faecal Coliforms and Hygiene Risk in Soils Treated with Municipal Sewage Sludges

作　　者：孙玉焕[1] 杨志海[1] 

机构地区：[1]青岛科技大学环境与安全工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2008年第4期310-313,317,共5页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金重点项目(40432005)

摘　　要：粪大肠菌群(FC)是判定污泥土地安全利用的重要指标之一。室内培养实验结果表明,污泥中的FC进入土壤后其数量随培养时间的延长逐渐降低,培养56 d后的数量与对照处理开始培养时的数量接近。由于FC的再发,增加了风干污泥土壤利用的病原生物学风险。培养7 d时,苏州风干污泥处理土壤中FC含量是苏州新鲜污泥处理的50多倍。污泥种类和培养时间是影响施污泥土壤中FC含量变化的主要因素。污泥种类影响FC的数量和再发能力,而FC与土著微生物竞争营养基质等是导致其数量在土壤中逐渐降低的主要原因。An incubation experiment was conducted to monitor the effect of sewage sludge on changes of faecal coliforms in soils over time and evaluate the hygiene risk. Soil faecal coliform counting was made after 1, 7, 14, 28, 56 and 84 d of incubation. The faecal coliform number in the sludge-treated soils decreased substantially with time and was similar to its in the untreated controls after incubation for 56 d. Land applica tion of air-dried sludges increased the hygiene risk due to the re-growth of faecal coilforms, and the number of faecal coliforms in soil treated with air dried sludge from Suzhou was 50 times higher than in soils with fresh dewatered sludge from Suzhou after 7 d of incubation. The main factors affecting the change in faecal coliform numbers were sludge type and incubation time. Sludge type determined the faecal coliform number and the ability of the faecal coliforms to re-establish, and indigenous microorganisms competed with the faecal coliforms for nutrients during the incubation process.

关 键 词：粪大肠菌群 卫生风险 污水污泥 土壤 

分 类 号：X820.4[环境科学与工程—环境工程]