南水北调水源对水厂现状工艺的适应性研究

Adaptability of water source from the South to North Water Diversion Project on present process in waterworks

针对南水北调中线工程通水后,丹江口水库原水对水厂现状处理工艺的适应性问题开展了中试研究。结果表明,水处理过程应投加助凝剂以强化沉淀去除效果,混凝剂选择聚合氯化铝,与助凝剂活化硅酸钠比例为5∶1时的水处理效果为最佳;以控制沉淀出水浊度1 NTU以下为目标,当原水浊度分别〈5,5-10和10-20 NTU时,聚合氯化铝的投加量分别大于10,15和30mg/L;在试验平均水质参数条件下,现状水厂可优先选择常规处理工艺;采用上向流活性炭处理工艺可增强对CODMn和UV254的去除效果。

Aimed at through water in the middle route of the South to North Water Diversion Project, the adaptability of raw water from Danjiangkou reservoir on present process in waterworks was studied by a pilot test. The results showed that adding coagulant aid could strengthen sedimentation removal effect, which polyaluminum chloride （PAC）as the coagulant chosen. When the proportion between coagulant and coagulant aid （ activated sodium silicate） was 5 ： 1, the optimal water treatment effect was obtained. The outflow turbidity of sedimentation was maintained below 1 NTU. When the turbidity in raw water was less than 5 NTU, 5 to 10 NTU and 10 to 20 NTU, the dosages of PAC should be more than 10 mg/L, more than 15 mg/L and more than 30 mg/L respectively. If the average water quality was similar with the test condition, and the conventional process could be used firstly. The removal effects of CODMn and UV254 were improved by up-flow activated carbon process.