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通过某水厂中试基地,研究了预臭氧与臭氧预氧化后常规工艺对嗅味物质2-甲基异茨醇(2-MIB)、土腥素(GSM)的去除效果及机理,分析了以TOC、UV_(254)为表征的有机物变化与作用。研究数据显示,未采用臭氧预氧化时,常规工艺对2-MIB和GSM的累积去除率为29.8%和31.3%。参照水厂实际预臭氧投加浓度,当预臭氧投加量为0.56 mg/L时,预臭氧段对2-MIB和GSM的去除率为34.60%和35.84%,略有上升;对UV_(254)和TOC的去除效果较低,去除率分别为6.5%和3.4%,但是分子量分布测试数据显示,预臭氧段出水中大分子有机物分布明显增加,在该浓度条件下,预臭氧对有机物产生了良好的微絮凝作用。经臭氧预氧化后,常规工艺(砂滤出水)对2-MIB和GSM累积去除率可达到58.05%和60.83%,显著上升。结果表明,预臭氧对常规工艺去除2-MIB和GSM具有明显提高的效果,不仅是因其具有较强的氧化能力,其次还有显著的微絮凝促进作用,增强了常规工艺的混凝、沉淀和过滤对2-MIB、GSM去除。
Through a pilot plant in a water plant, the removal efficiency and mechanism of 2-methylisoxyl (2-MIB) and goutyrite (GSM) in the conventional process after pre-ozone and ozone pre-oxidation were studied. Changes and Effects of Organic Matter Characterized by TOC and UV_ (254). The data show that the cumulative removal of 2-MIB and GSM by the conventional process was 29.8% and 31.3%, respectively, when ozone pre-oxidation was not used. According to the actual concentration of pre-ozone dosing in waterworks, when the pre-ozone dosage was 0.56 mg / L, the removal rates of pre-ozone section for 2-MIB and GSM were 34.60% and 35.84% ) And TOC removal efficiency were lower, the removal rates were 6.5% and 3.4%, respectively, but the molecular weight distribution test data show that the distribution of macromolecules organic compounds in the pre-ozone section effluent increased significantly. Under this condition, pre-ozone produced organic Good micro-flocculation. After pre-oxidation by ozone, the cumulative removal rate of 2-MIB and GSM reached 58.05% and 60.83%, respectively, in the conventional process (sand filtration water), significantly increased. The results show that the pre-ozone has obvious effect on removing 2-MIB and GSM by conventional process, not only because of its strong oxidizing ability, but also has a significant micro-flocculation promoting effect, which enhances the coagulation and sedimentation of the conventional process And filter on 2-MIB, GSM removal.