预氯化对原水长距离输水管道硝化性能的破坏与恢复

摘要

采用稳定运行的环状生物膜反应器(bio-films annular reactor,BAR)模拟原水长距离输水管道水质净化过程,以不同投氯方式进行预氯化对原水输水管道硝化性能的破坏与恢复试验研究.结果表明,预氯化对管道生物膜AOB损伤较大,灭活率为4.96log,对NH+-N、NO2--N去除效能影响明显.恢复阶段CT值越高生物膜中AOB恢复生长速率越快.生物膜对NH+-N去除效能的恢复较NO2--N快2d,NH4+-N、NO2--N分别在第8d和第10 d完成恢复.生膜中AOB数量的恢复与管道对NH4+-N的去除率之间存在明显的相关性,其相关系数可达到92％.%The process, that is destruction and recovery of nitrification performance in aqueduct by pre-chlorination, is simulated by a BAR (bio-film annular reactor) with addition of chlorine in different ways. The results showed that pre-chlorination can cause larger damage to the bio-film AOB on pipe, and give significant influence on removal of NH+4-N and NO-2-N. Higher CT value is, higher growth rate AOB during recovery stage of bio-film. The recovery was quicker for removal performance of NH+4-N (8 d) than for that of NO-2-N (10 d). Finally, it is found that there has remarkable correlation between amount of AOB and removal rate of NH+4 -N in pipe, and their correlation coefficient can reach as high as 92%.