手压井井水消毒的研究

试验表明，在手压井水面下安放特制的装有次氯酸钙片（３６０ｍｇ／片）的消毒管后３０分钟，井水含氯量可达０．３０ｍｇ／Ｌ以上，并使细菌总数与大肠菌群数减至饮水卫生标准。消毒管释氯孔径愈大，管装消毒剂片数愈多，水中有效氯含量愈高。

STUDYONDISINFECTIONOFWATER INMANUALLYPUMPING WELL

A disinfection tube containing 20 tablets of calcium hypochlorite(360 mg /tablet,avail-able chlorine content was 62%)suitable for disinfection of water in manually pumping wellwas developed. On use, it was installed in the pumping tube below the water intake valve ofthe pump 30～50 cm under water surface. After 30 minutes,the chlorine content of the wellwater could attain 0.30 mg / L and the total bacterial count of the water decreased to 14cfu/ ml with coli-group bacterial count being reduced to < 3 cfu/ L.The tests for influencing factors showed that the chlorine content of water increased withincreasing the diameter ofchlorine-releasing holes on the disinfection tube and increasing thenumber of calcium hypochlorite tablets in the tube,but had no signiflcant relation to early orlate outflow of the water.