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目的探讨腐殖酸氯消毒副产物生成潜力评估指标。方法选用2种商品腐殖酸和1种提取自活性污泥的腐殖酸作为目标物(1.67~10 mg/L)进行氯化消毒过程的实验室模拟研究,检测254 nm紫外吸光度(UV254)、总有机碳(TOC)、三卤甲烷(THMs)、卤代乙酸(HAAs)并进行线性拟合。结果 3种腐殖酸在氯化消毒过程中均能产生THMs和HAAs,其中THMs的生产潜力为11.63~43.61μg/mg TOC,HAAs的生产潜力为11.03~24.06μg/mg TOC。HAAs的生成潜力与单位TOC的腐殖酸254 nm紫外吸收(SUVA)具有较好相关性(P<0.05)。采用SUVA与腐殖酸氧含量的乘积作为参数,与THMs类物质的产生具有更好的相关性(P<0.05)。结论三氯甲烷和氯乙酸(二氯乙酸、三氯乙酸、一氯乙酸)分别是主要的THMs和HAAs类氯消毒副产物。SUVA和SUVA与腐殖酸氧含量的乘积可分别用作氯消毒过程中HAAs和THMs类副产物生成潜力的评价指标。
Objective To investigate the potential evaluation of the generation potential of humic acid chloride disinfection by-products. Methods Two kinds of commercial humic acids and one kind of humic acid extracted from activated sludge were selected as the target (1.67 ~ 10 mg / L) to conduct the laboratory simulation study of chlorination disinfection. The UV absorbance at 254 nm (UV254) , Total organic carbon (TOC), trihalomethanes (THMs) and haloacetic acids (HAAs) were determined and linear fitted. Results THMs and HAAs were produced during the chlorination of three humic acids. The production potential of THMs was 11.63 ~ 43.61μg / mg TOC, and the production potential of HAAs was 11.03 ~ 24.06μg / mg TOC. The potential of HAAs was correlated well with the UV absorbance of 254 nm (SUVA) of TOC at unit TOC (P <0.05). Using the product of SUVA and humic acid oxygen content as a parameter, it has a better correlation with THMs (P <0.05). Conclusions Trichloromethane and chloroacetic acid (dichloroacetic acid, trichloroacetic acid, monochloroacetic acid) are the major chlorinated by-products of THMs and HAAs, respectively. The product of SUVA and SUVA with the humic acid oxygen content can be used as an evaluation index respectively for the potential for the generation of HAAs and THMs by-products during chlorine disinfection.