摘要
以太湖流域某水厂常规工艺和深度处理工艺(臭氧活性炭,O_3-BAC)出水为研究对象,以可同化有机碳(AOC)为生物稳定性评判指标,对比研究了常规工艺与深度处理工艺出水在氯胺消毒过程中生物稳定性的变化特征。试验结果表明,尽管臭氧活性炭工艺提高了出水的浊度和耗氧量等常规水质指标的去除率,但出水在氯胺消毒后水质的生物安全性降低。当接触时间为120 min时,氯氮比为5:1和3:1的氯胺消毒后,水中细菌灭活率分别为3.26 lg和2.90 lg,AOC分别为94.87μg/L和107.31μg/L,表明采用高氯氮比(5:1)的氯胺消毒后水质生物稳定性优于使用低氯氮比的氯胺(3:1)。氯胺(5:1)消毒时当氯胺投加量为0.50 mg/L、CT值为90 mg·min·L~(-1)时,出水生物稳定性最佳。
The objects of the study were the effluents of conventional treatment process and advanced treatment process(O_3-BAC) of a water plant in Taihu Lake basin.Based on biological stability index( assimilable organic carbon, AOC), characteristics of biological stability of the effluents during chloramine disinfection were compared.The results indicated that biological stability decreased though the removal of turbidity and COD_(Mn) increased when advanced treatment process was applied.A chloramine disinfection test with chlorine to nitrogen ratio of 5:1 and 3 :1 was carried out under the condition that the contact time was 120 min.The inactivation rate of bacteria in water was 3.26 lg and 2.90 lg,respectively, and the AOC was 94.87 μg/L and 107.31 μg/L(CT=360 mg·min·L~(-1)),indicating that bio-stability of the water after disinfection with chloramine of higher chlorine to nitrogen ratio(5:1) was better.When chloramine of higher chlorine to nitrogen ratio(5:1) was adopted for disinfection, effluent biological stability was the best when chloramine dosage was 0.50 mg/L and CT value was 90 mg·min·L~(-1).
引文
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