预氯化对输水管道净水效能影响及恢复研究

Destruction and restorative of purification efficiency in diversion pipe by prechlorination

摘要:

为保障原水输水过程中水质安全性,采用生物膜环状反应器(BAR, Biofilms Annular Reactor)考察预氯化对管道生物膜净水效能的影响及其性能恢复过程．结果表明,管道预氯化后,对管道生物膜损伤较大,影响NH₄+-N、NO₂--N、CODMn、TP去除效果;出水出现短暂的CODMn和TP质量浓度上升、NO₂--N积累现象,出水NO₂--N最大积累量可达7倍．冲击实验后稳定运行阶段,生物膜对NH₄+-N去除效能恢复时间较NO₂--N快2 d,NH₄+-N、NO₂--N分别在第8天和第10天完成恢复;稳定运行至第8天,管壁生物膜完成对CODMn和TP去除效能的恢复．

Abstract:

To ensure the safety of water in the process of translation in long distance raw water diversion pipe, the damagemant and recovery of purification by added chlorine to Biofilms Annular Reactor(BAR) which simulated the pipe was investigated. The results showed that the prechlorination can damage the pipe bioflim, lower the removal rate of NH₄+-N, NO₂--N, CODMn, TP, and the effluent of concentration of CODMnand TP was elevated in short term and NO₂--N concentration was rised in long term after prechlorination. The effluent concentration of NO₂--N can be reached 7 times of the influent. The recovery of removal of NH₄+-N was earlier 2 days than that of NO₂--N, and NH₄+-N and NO₂--N could be completely repaired on 8 dsys and 10 days, respectively. The removal of CODMn and TP can be completely repaired on 8 days.