污水的光化学灭菌处理研究

以日光和中压汞灯为光源，以亚甲基兰为光敏剂，研究了南京市某污水样的灭菌处理和从灭菌水样中除去ＭＢ的方法，结果表明，光源，光强，光照时间，ＭＢ用量和溶解氧等因素对灭菌有显著影响，不加ＭＢ的水样经紫外光灭菌后，在日光下细菌呈现复活，当１Ｌ细菌总数为３．１×１０＾６个／ｍｌ的污水加入２ｍｇ ＭＢ，并在充气状态下以３００Ｗ中压汞灯光照４ｍｉｎ，其灭菌率达１００％，且无光复活，同样条件下日光的灭菌率则低很多

Photochemical Disinfection of Wastewater

A new method of photochemical disinfection for wastewater from Nanjng city was investigated. By ae rating and using methylene blue(MB)as photosinsitizer,the wastewater samples were disinfected under sunlight and a medium pressure mercury lamp separately. The results were as follows:(1)The disinfection of wastewater were remarkably affected by the light sources,light intensity,irradiaded time,MB concentration and dissolved oxygen;(2)The bacteria which were disinfected by UV could be partially photoreactivated under sunlight;(3)The disinfection rate could reach 100% and the bacteria photoreactivation were not appeared when l liter of the sample containing 3.1×10⁶ bacteria and 2 mg MB were irradiaded by a 300W medium pressure mercury lamp for 4 min;(4)The residual MB in the samples could be removed by bentonite clay. The disinfection mechanisms of UV and photosensitization,the bacteria photoreactivetion and the effects for affecting disinfection were discussed.