新型复合预氧化技术控制副产物的试验研究

Advantages of two-step oxidation of KMnO_4 followed by ozonation

臭氧被广泛应用于饮用水预氧化工艺中,但是成本较高,而且会生成臭氧化副产物,如可同化有机碳(AOC)、溴酸盐和甲醛。因此,提出臭氧/高锰酸钾复合预氧化技术,并对照预臭氧化技术,进行了消毒副产物前质及臭氧化副产物控制的小试试验研究。结果表明,与预臭氧化(1.5mg/L臭氧)相比,复合预氧化(0.6mg/L臭氧+0.4mg/L高锰酸钾)能促进混凝沉淀对消毒副产物前质的去除,总去除率与单独预臭氧化的去除率相当。而且又能降低AOC生成量,并促进混凝沉淀对AOC的去除,合计AOC去除率达43%左右。此外,对溴酸盐和甲醛生成量也有明显去除效果,比单独预臭氧化降低了78.4%和21.2%。

Conventional pre-ozonation in water treatment has caused many problems, such as high cost and formation of ozonation byproducts （AOC, bromate and formaldehyde）. The paper presents data showing the advantages of an innovative two-step pre-oxidation technique of KMnO4 followed by 03. Relative to the conventional ozonation （O3 =1.5 mg/L）, the new oxidation method （O3 =0.6 mg/L, KMnO4 =0.4 mg/L） is less expensive yet with about the same effectiveness for removal of DBPs precursors; its other advantages includes far less production of AOC （reduced by 43%）, bromate （78%） and formaldehyde （21%）.