预氯化对PDMDAAC形成消毒副产物NDMA的影响

Effect of pre-chlorination on NDMA formation from PDMDAAC

为了解水处理参数对聚二甲基二烯丙基氯化铵(PDMDAAC)的亚硝基二甲胺生成潜能(NDMAFP)的影响,研究了预氯化和氯胺形式对PDMDAAC的NDMAFP的影响。通过分析NDMAFP和剩余二甲胺(DMA)的浓度发现预氯化对PDMDAAC的NDMAFP有一定的影响,预氯化时间和预氯化剂量的影响不显著,预氯化时的pH值影响显著。溶液中形成的少量二氯胺(NHCl_2)和PDMDAAC降解释放的DMA是亚硝基二甲胺(NDMA)形成的关键因素。溶液中溴离子(Br^-)和腐殖酸的存在增大了PDMDAAC的NDMAFP。

To understand how water treatment parameters affect the formation of NDMA from PDMDAAC,the effects of pre-chlorination and the forms of chloramine on NDMA formation from PDMDAAC were investigated.The pre-chlorination dose and contact time had no significant effect on NDMA formation potential（ NDMAFP）.Pre-chlorination pH had significant influence on PDMDAAC＇s NDMAFP. The results suggest that the partial formation of dichloramine（ NHCl2） and DMA release by PDMDAAC degradation were the critical factors affecting NDMA formation. The existence of Br-and humic acid increased NDMA formation from PDMDAAC.