臭氧对陶瓷膜去除地表水中有机物的影响研究

Effect of Ozone on Organic Matter Removal in Surface Water Using Ceramic Membrane

采用臭氧氧化技术改善陶瓷膜对钱塘江原水的处理效果,基于臭氧对膜出水中有机物的氧化作用,探讨不同的臭氧投加方式对陶瓷膜过滤特性的影响。结果表明,臭氧可较好地去除有机物,提高膜过滤通量。当臭氧投加量为5 mg/L时,对DOC和UV254的去除率可由未投加臭氧时的34%和22.5%提高到44. 6%和40%;臭氧可有效提高陶瓷膜的膜通量,且随臭氧投加量的增加而逐步提高,臭氧投加量为5 mg/L时,膜比通量较未投加臭氧时提高了 18.3%;膜的化学清洗液的分析结果表明,臭氧氧化了污染陶瓷膜的一些有机物质,从而减少了膜污染,提高了膜通量。

Ozone was adopted to improve the treatment of Qiantang River surface water by ceramic ultrafiltration membrane. The effect of ozonation of organic matters on the membrane filtration was investigated. The results showed that ozone could effectively improve the organic matters removal and the membrane performance. The removal of organic matters indexed by DOC and UV254 of permeate without ozone were 34% and 22. 5%, respectively, and were increased to 44. 6% and 40% after 5 mg/L ozone was added. Ozone could effectively enhance membrane flux along with the increase of ozone dosage. When 5 mg/L ozone was added, membrane specific flux was 18. 3% higher than that without ozone. Analysis of chemical cleaning solution showed that ozone oxidized some organic matter that the membrane retained, and subsequently reduced membrane fouling and increased membrane flux.