论文部分内容阅读
为有效应对O3-BAC工艺引起的净水工艺中仙女虫污染风险,进行了混凝沉淀对仙女虫控制效果研究.首先进行了自来水厂混凝沉淀单元仙女虫现场采样分析,再结合仙女虫混凝沉淀去除的烧杯实验和沉淀池迁移模拟实验,分析探讨混凝沉淀对仙女虫的去除规律和控制效果.结果表明,自来水厂混凝沉淀和烧杯实验条件下的混凝沉淀均对仙女虫去除效果明显,前者可以将仙女虫平均密度由0.52 ind/m3降至0.17 ind/m3,后者则基本上能实现对仙女虫100%的去除,且去除率不受混凝操作条件的影响.仙女虫可以发生从底泥向上覆水的浮游迁移,温度和水流冲刷可以影响浮游迁移,20℃时浮游率为18.5%,高于30℃和10℃时,水流流速为2、4和8 mm/s时,仙女虫的总浮游迁移数量分别为11、25和39 ind.由于浮游迁移的存在,混凝沉淀阶段仙女虫在沉淀池的沉底并不意味着仙女虫的真正去除,只有通过沉淀池排泥才能实现仙女虫从净水工艺中的彻底分离.可以通过优化沉淀池排泥和抑制仙女虫在沉淀池的浮游迁移来提高混凝沉淀对仙女虫的控制效果.
In order to effectively deal with the pollution caused by O3-BAC process in the water purification process, the control effect of coagulation and sedimentation on the female was studied.Firstly, the spot sampling and analysis of the fairy female coagulation unit in the waterworks was carried out, Coagulant removal beaker experiment and sedimentation tank migration simulation experiment to analyze the coagulation sedimentation on the fairy female insect removal rules and control results.The results show that coagulation and sedimentation in the water plant coagulation and sedimentation under experimental conditions were the fairy female insect removal The former can reduce the average density of the fairy lady worm from 0.52 ind / m3 to 0.17 ind / m3, while the latter can basically achieve 100% removal of the fairy worm, and the removal rate is not affected by the coagulation operating conditions. The larva migrated from the sediment to the overlying water. The temperature and water scouring could affect the migration of the plankton. The pelagic rate was 18.5% at 20 ℃, and the flow velocities were 2,4 and 8 mm / s at 10 ℃ and 10 ℃, respectively , The total number of migratory nymphs were 11, 25 and 39 ind, respectively. Due to the floating migration, the immortal insects in the sedimentation tank at the coagulation and sedimentation stage did not mean the true removal of the nymphs. In order to achieve the complete separation of the fairy worm from the water purification process, it is possible to improve the control effect of the coagulation and sedimentation on the female insects by optimizing the sludge in the sedimentation tank and inhibiting the floating migration of the female insects in the sedimentation tank.