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目的了解现有的三格式化粪池对粪便处理的卫生学效果,方法于2007年9月—2008年1月在重庆市某区A镇选择代表性的A村,采用单纯随机抽样方法对20所户厕及三格式化粪池进行现场调查,检测第三格粪水的卫生学和环境学指标。结果本次抽样检测第三格粪水的pH值基本在8～9范围内,其合格率达85%,而其他指标的合格率普遍偏低,其中化学需氧量、氨氮和总氮的合格率仅5%,五日生化需氧量和总磷为10%,总悬浮和色度为15%,粪大肠菌群值均不合格。结论本次调查的三格式化粪池后期管理有待改善,化粪池粪水若直接排放会造成环境二次污染,应采取措施进行深度处理。
Objective To understand the hygienic effect of the existing three-format septic tank on manure disposal. Methods From September 2007 to January 2008, A-village of A town in a certain district of Chongqing was chosen as the representative village. A simple random sampling method was used to test 20 Household toilets and three-format septic tank on-site survey to test the third case of toilet water hygiene and environmental indicators. Results The pH value of the third sample of fecal water in this sampling was basically within the range of 8 to 9, with a passing rate of 85%, while the pass rates of other indicators were generally low. The chemical oxygen demand, ammonia nitrogen and total nitrogen were acceptable Rate of only 5%, on the 5th biochemical oxygen demand and total phosphorus was 10%, total suspended and chroma is 15%, fecal coliform value are unqualified. Conclusion The post-production management of the three-format septic tank in this survey needs to be improved. If the direct discharge of septic tank manure could cause secondary environmental pollution, measures should be taken for further treatment.