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以单宁酸替代饮用水中的天然有机物,对臭氧、氯胺顺序消毒过程中臭氧和氯胺的衰减以及消毒副产物生成与pH之间的关系进行了研究。结果表明,臭氧消毒阶段臭氧投加量由0.5 mg·L-1增加到5 mg·L-1,24 h后溶液的pH从5.9下降到4.3;相应地,随着臭氧投加量的逐渐增加,氯胺消毒阶段一氯胺的衰减速率逐渐变慢,减少了氧化天然有机物所消耗的一氯胺。在pH为8.3,一氯胺的稳定性最好,但与pH对消毒效果的影响不一致,将pH控制在7.0左右可能更理想;二氯乙酸在pH为6.8时生成最多,三氯甲烷和三氯乙酸也基本在pH为7.0～7.5时达到最大。臭氧氯胺顺序消毒过程中,pH对一氯胺的衰减和消毒副产物生成的影响较大,应加强控制。
Using tannic acid to replace natural organic compounds in drinking water, the relationship between ozone and chloramines decay and the generation of disinfection by-products and pH during sequential disinfection of ozone and chloramines were studied. The results showed that the ozone solution pH dropped from 5.9 to 4.3 after ozone dosage increased from 0.5 mg · L-1 to 5 mg · L-1 for 24 h. Correspondingly, with the increase of ozone dosage , Chloramine disinfection phase monochloramine decay rate becomes slower, reducing the consumption of oxidized natural organic monochloramine. At pH 8.3, the stability of monochloramine is the best, but it is not consistent with the effect of pH on the disinfection effect. It may be more desirable to control the pH at around 7.0. Dichloroacetic acid produces the most at pH 6.8, and chloroform and tris Chloroacetic acid also reached its maximum at pH 7.0-7.5. During the sequential disinfection of ozonated chloramines, pH had greater influence on the attenuation of monochloramine and the formation of disinfection byproducts, and should be strengthened.