高藻期控制消毒副产物及其前体物的优化工艺组合

Optimal Process Combination for Control of Disinfection By-products and Precursors During High Algae Laden Period

为实现在控制藻类的同时减少副产物生成量，比较了预氧化＋常规工艺、预氧化＋常规＋深度处理2类共7种组合工艺对消毒副产物及其前体物的去除特性．试验结果表明，藻类是重要的前体物，在本试验原水中，藻类贡献了20％左右的卤乙酸和三卤甲烷前体物．气浮工艺是高藻期除藻的核心工艺，同时也可以去除一部分消毒副产物前体物．臭氧、高锰酸钾也有很好的杀藻效果和前体物去除效果．采用臭氧或高锰酸钾预氧化＋常规＋臭氧一活性炭工艺的组合对消毒副产物及其前体物的去除效果最佳．顺序氯化工艺比游离氯消毒减少卤乙酸生成量42．0％～45．9％，减少三卤甲烷生成量22．5％～71．4％．

Traditional pre-chlorination process would lead to high yield of DBPs during high algae laden period. It had been compared that the efficiency of control disinfection by-products and their precursors by two classes and total 7 kinds of process combination. Algae were proven to be important DBP precursor and it contributed about 20% of HAA and THM precursor. Air floatation was key process to remove algae and it could also reduce the precursor concentration in some degree. Ozone or potassium permanganate also had good efficiency on algae removal, and precursor as well. The best process combination for DBPs and their precursor removal is pre-oxidation of ozone or potassium permanganate plus conventional process plus ozone-BAC process. Sequential chlorination can reduce 42.0% -- 45.9% HAA yield and 22.5% -- 71.4% THM yield of free chlorination.