臭氧化对水厂水中消毒副产物生成势的影响

以某饮用水厂沿程工艺出水为研究对象,研究了臭氧化预处理对水体中消毒副产物(DBPs)氯化生成势的影响。结果表明,水厂生物处理单元产生的胞外聚合物(EPS)和溶解性微生物产物(SMP)等生物源有机物是非常有效的DBPs前体物,但其更易于氯化生成三卤甲烷(THMs)而非卤乙酸(HAAs)。水厂水中存在的THMs前体物主要是各类大分子量有机物,并且臭氧工艺对其有较好的氧化去除效果。水厂水中经臭氧氧化产生的小分子量有机物可能是更为有效的一氯乙酸(MCAA)和一溴乙酸(MBAA)前体物。此外,当水体中三氯乙酸(TCAA)前体物浓度较高时,臭氧工艺对TCAA生成势具有很好的去除效果。

Influence of ozonation on chlorinated disinfection by-products formation potential in drinking water

The effect of ozonation on chlorination disinfection by-products (DBPs) formation potential in drinking water was studied in present study. The results showed that extracellular polymeric substances (EPS) and soluble microbial products (SMP) from biological treatment units were efficient precursors of chlorinated DBPs, and they were more efficient precursors of trihalomethans (THMs) than haloacetic (HAAs). The major precursors of THMs in water samples were the high molecular weight organics which were removed by ozonation efficiently. The low molecular weight organics that produced by ozonation might be efficient precursors of monochloroacetic acid (MCAA) and monobromoacetic acid (MBAA). Trichloroacetic acid (TCAA) formation potential could be removed by ozonation efficiently, especially in high initial concentration of TCAA precursors.