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以地下水源水中真菌为研究对象,研究了单独紫外线灭活、单独氯灭活以及紫外线-氯顺序灭活的灭菌效果,同时对单独消毒剂灭活进行了动力学研究,确定了其动力学参数。结果表明:单独紫外线灭活时,在相同紫外剂量(I·t)下,高紫外强度(I)下真菌的灭活效果优于低紫外强度的灭活效果;紫外线灭活符合一级光化学反应,其速率常数k为0.044~0.077 cm2·(m W·s)~(-1)。单独氯灭活时,氯浓度2.0 mg·L~(-1),作用30 min,真菌灭活率达到95%;氯衰减符合一级衰减模型,即氯灭活真菌符合一级动力学反应,其速率常数k为0.056~0.081 L·(mg·s)~(-1)。紫外线-氯顺序灭活时,高紫外剂量-低加氯量可以达到低紫外剂量-高加氯量的灭活效果;真菌完全灭活时,紫外剂量从5 m J·cm~(-2)增加到30 m J·cm~(-2),加氯量可降低1~2 mg·L~(-1),减少了消毒副产物的生成量,降低了生态环境风险;紫外线与氯顺序灭活具有协同效应。
Taking the fungi in groundwater as the research object, the sterilization effects of single UV inactivation, single chlorine inactivation and ultraviolet-chlorine sequential inactivation were studied. At the same time, the kinetics of single disinfectant inactivation was studied, and its kinetics parameter. The results showed that the inactivation effect of fungi with high UV intensity (I) was better than that with low UV intensity under the same ultraviolet dose (I · t) when UV light alone was inactivated. UV inactivation was in agreement with first-order photochemical reaction , The rate constant k is 0.044 ~ 0.077 cm2 · (m W · s) -1. When chlorine alone was inactivated, the inactivation rate reached 95% when the concentration of chlorine was 2.0 mg · L -1 for 30 min. The decay of chlorine accorded with the first order decay model, that is, the chlorinated inactivated fungi accorded with the first order kinetic reaction, The rate constant k is 0.056 ~ 0.081 L · (mg · s) -1. UV - chlorine inactivation sequence, the high UV dose - low chlorination can reach low UV dose - high inactivation of chlorination; fungal inactivation, the UV dose from 5 m J · cm -2 When the concentration of chlorination was reduced to 1-2 mg · L -1, the production of disinfection by-products decreased and the ecological risk reduced. Live with a synergistic effect.