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该文考察运行18个月的常规/臭氧-生物活性炭(O3-BAC)组合工艺对中国华东地区某微污染湖泊水的处理特性。结果表明:此时该工艺去除有机物能力有限,但对消毒副产物亚硝胺前体物的去除能力高于其他有机物。工艺出水溶解性有机碳(DOC)质量浓度、UV254和溶解性有机氮(DON)质量浓度的平均值分别为3.12mg/L、0.053cm-1和0.171mg/L,平均去除率分别为34.9%、53.9%和32.7%;对亚硝胺前体物的去除率为72.3%。臭氧和炭池中的微生物在去除亚硝胺前体物中发挥了重要作用。小分子有机物、芳香性蛋白质和微生物代谢产物主要在活性炭单元中去除。因而,要关注长期运行的常规/O3-BAC组合工艺对有机物及其亚硝胺前体物的去除,充分发挥微生物作用。
This paper investigates the treatment characteristics of a slightly polluted lake water in East China with a combination of conventional / ozone-biological activated carbon (O3-BAC) processes operating for 18 months. The results showed that the process had limited ability to remove organic matter at this time, but the removal efficiency of nitrosamines precursors was higher than that of other organic compounds. The average concentrations of dissolved organic carbon (DOC), UV254 and dissolved organic nitrogen (DON) in the effluent were 3.12mg / L, 0.053cm-1 and 0.171mg / L respectively, with the average removal efficiencies of 34.9% , 53.9% and 32.7% respectively; the removal rate of nitrosamine precursor was 72.3%. Microbes in the ozone and carbon pools play an important role in removing nitrosamine precursors. Small molecules of organic matter, aromatic proteins and microbial metabolites are mainly removed in the activated carbon unit. Therefore, we should pay attention to long-term operation of conventional / O3-BAC combination of organic matter and its nitrosamine precursor removal, give full play to the role of microorganisms.