| 混凝沉淀对净水工艺中仙女虫的控制研究 |
| 摘要点击 893 全文点击 1346 投稿时间：2010-10-15 修订日期：2011-03-08 |
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| 中文关键词 混凝沉淀 仙女虫 净水工艺 控制 O3-BAC |
| 英文关键词 coagulation and sedimentation naidid water treatment process controlling O3-BAC |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| To control naidid pollution in water treatment conducted by O3-BAC, the removal effects of coagulation and sedimentation to naidid were estimated by field sampling of water plant, jar test and simulation study. The results showed that both coagulation and sedimentation of water plant and jar test had obvious removal efficiency on naidids. In the former the mean population density of naidid was decreased from 0.52 ind/m3 to 0.17 ind/m3, while in the later removal efficiency, which did not be influenced by operation condition of coagulation and sedimentation, reached nearly 100%. Drift migration of naidid from sediment to over-lying water were observed in simulation study and the drift efficiency could be influenced by both temperature and water flow. The drift efficiency of 20℃ was 18.5%, much higher than that of 30℃ and 10℃. While the velocities of water flow were 2, 4 and 8 mm/s, the number of drifting naidid were 11, 25 and 39 ind respectively. Because of the existence of drift migration, the settlement in sedimentation tank does not mean the real remove of naidid and the thoroughly separating of naidid from water treatment process can only be realized by sludge discharge of sedimentation tank. The naidid removal efficiency of coagulation and sedimentation can be increased by optimizing sludge discharge and restraining drift migration of naidid in sedimentation tank. |
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