ABSTRACT
Objective To assess the result of the sanitary clearance of Huaneng Qiaoqi reservoir bottom.Methods According to related standards and regulations,the sanitary clearance of Huaneng Qiaoqi reservoir bottom was conducted and the result was assessed in Oct.2006.Results 14 360 m~2 farm,417 excrement pits,390 latrines,1 599 graves were sanitarily cleaned. Deratization was carried out in reservoir bottom with Chinese area of 4 878 mu,rat density met the standard(
ABSTRACT
Objective To perform a hygienic assessment of the three-chamber septic tanks and analyze the efficiency of non- hazardous treatment of feces and the impact on the environment, so as to provide the reference for the three-chamber septic tanks improvement test. Methods From September 2007 to January 2008, the 20 latrines of residents and the three-chamber septic tanks were selected by simple random sampling method from A village of A town , Chongqing , as the investigation point,with suitable economic conditions,the status of the latrines with three-chamber septic tanks were surveyed, and the hygienic and environmental indicators of the third chamber feces samples were detected. Results After the implementation of the three-chamber septic tanks, the rural ecological environment was improved. The samples test showed that pH value was basically in the range of 8-9, the qualified rate was 85%, as for the other indicators, the qualified rates were generally lower. The qualified rate of chemical oxygen demand, ammonia nitrogen and total nitrogen was only 5% , five-day biochemical oxygen demand and total phosphorus was 10% , SS and the color was 15% , fecal coliform value of the samples were not qualified. Conclusion The management of the three-chamber septic tanks needs to be improved. If the liquid dung of septic tanks was directly discharged, it will cause secondary environmental pollution.So it should be deeply treated.