Proportion of bromo-DBPs in total DBPs during reclaimed-water chlorination and its related influencing factors

• 来源期刊: 中国科学B辑（英文版）
• 年，卷（期）: 2008,（10）
• 页码范围: 1000-1008
• 页数: 9页
• 语种: 英文
• DOI: 10.1007/s11426-008-0097-1

摘要

During the chlorine disinfection of reclaimed-water, the proportion of bromo-disinfection by-products (bromo-DBPs) in total DBPs is affected by chlorine dosage, reaction time, Ph, ammonia nitrogen (NH3-N) and preozonation. Results show that bromo-trihalomethanes (bromo-THMs) form more easily than bromo-haloacetic acids (bromo-HAAs) and bromine incorporation in DBPs decreases with the increase of chlorine dosage. Within 5 h, bromine incorporation in THMs (n(Br)) increases but bromine incorporation in HAAs (n'(Br)) decreases with the extension of reaction time; however, n(Br) decreases and n'(Br) keeps relatively constant at a longer reaction time. Furthermore, bromine incorporation in DBPs is low under acidic and alkaline conditions. The increase of NH3-N concentration inhibits the formation of chloro-DBPs, resulting in the increase of n(Br) and n'(Br) to some extent. Preozonation enhances the formation of HOBr and the increase of bromine incorporation in DBPs; however, ozone of a high concentration oxidizes HOBr to its salt form, leading to the decrease of bromine incorporation in DBPs.