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研究了高藻水预氧化处理过程中,不同臭氧氧化程度及不同pH值条件下,藻类有机物释放与转化规律以及氯化消毒副产物(DBPs)的生成特性.结果表明,臭氧投加量为28.92 mg·L-1时藻去除率达36%.随着臭氧投加量的增加,藻的去除率进一步增加,类腐殖酸先增加后持续减少,溶解性微生物代谢产物、类富里酸和类芳香蛋白物质持续减少;低投加量的臭氧对二氯乙腈(DCAN)、三氯乙腈(TCAN)生成势有明显的控制作用,但会增加三氯硝基甲烷(TCNM)以及1,1,1-三氯丙酮(1,1,1-TCP)前体物,随臭氧投加量增大,DBPs生成势显著增大.酸性条件下臭氧对藻的去除效果最好,UV254以及总有机碳(DOC)均随pH的增大有所上升,但变化较小;臭氧氧化可降解溶解性微生物代谢产物,降解效果受pH影响较小,类腐殖酸有机物随pH值增大而减少;DCAN、TCAN生成势随pH增大有所降低,TCNM生成势在pH=10条件下最高,1,1,1-TCP生成势在pH=7条件下最高.
The effects of different ozone oxidation levels and different pH values on the release and transformation of algae organic compounds and the formation characteristics of chlorinated disinfection by-products (DBPs) were studied in the process of pre-oxidation of algae. The results showed that the ozone dosage was 28.92 mg · L-1 algae removal rate of 36%. With the increase of ozone dosage, algae removal rate further increased, the class humic acid continued to decrease after the first increase, soluble microbial metabolites, Aromatics decreased continually. Low dosage of ozone could obviously control the generation potential of DCAN and TCAN, but increased TCNM and 1,1,1-diphenyl- 1-trichloroacetone (1,1,1-TCP) precursor, with the increase of ozone dosage, the DBP generation potential increased significantly.Ozone had the best removal of algae under acidic conditions, UV254 and total organic carbon (DOC) increased with the increase of pH, but little changed. Ozone oxidation could degrade soluble metabolites of microorganisms, the degradation effect was less affected by pH, and the humic acid organic compounds decreased with the increase of pH value. DCAN , TCAN production potential decreased with increasing pH, TCNM production potential was highest at pH = 10, 1,1,1-TCP was generated At pH = 7 the highest under the condition.