丹江口水库水低温低浊期混凝剂优选  

Optimal selection of coagulants for treating low temperature and low turbidity Danjiangkou Reservior water

作　　者：孙云凯 何文杰[1,2] 孙颖 谭浩强[4] 

机构地区：[1]天津城建大学环境与市政工程学院,天津300384 [2]天津市自来水集团有限公司,天津300040 [3]中国市政工程东北设计研究总院,吉林长春130021 [4]哈尔滨工业大学,黑龙江哈尔滨150090

出　　处：《供水技术》2014年第1期1-6,共6页Water Technology

基　　金：南水北调等多水源供水条件下天津市饮用水安全保障技术(11ZCKFSF01700);国家水体污染控制与治理科技重大专项(2012ZX07404-002)

摘　　要：针对低温低浊时期丹江口水库水,通过混凝沉淀烧杯试验,对水厂普遍使用的3种混凝剂三氯化铁（FeCl3）、聚合氯化铝（PAC）和硫酸铝（AS）的投加量与沉淀时间进行优选.结果表明,在试验范围内,FeCl3和PAC投加量与余浊有很强的负相关性,在投加量为12 mg/L时余浊最小,分别为0.38和0.30 NTU,明显优于AS;混凝剂投加量与UV254去除效果高度正相关,混凝剂对UV254去除作用强弱关系为PAC＞AS＞FeCl3,投加量为12 mg/L时去除率最高,分别为59％,57％和52％;投加FeCl3和PAC所形成的絮体沉淀速度快,在20～ 30 min时即可完全沉淀,而投加AS形成的絮体所需沉淀时间在40 min以上.最后在中试系统对最优混凝剂PAC投加量与浊度和UV254之间的关系进行了适应性检验,结果表明适应性良好.Aimed at the low temperature and low turbidity Danjiangkou Reservior water, the optimal selection was conducted on the dosage and sedimentation time of ferric chloride （FeC13 ）, polyaluminum chloride（PAC） and aluminum sulfate （AS）by coagulation sedimentation beaker test. The results indicated that the dosage of FeC13 and PAC had strong negative correlation with residual turbidity among test scope. The minimum residual turbidity was obtained in 12 mg/L, which was 0.38 NTU and 0.30 NTU respectively. It was superior to AS obviously. The coagulant dosage had positive correlation with removal effect of UV254, the removal effect of UV254 was PAC 〉 AS 〉 FeC13. The maximum removal rate was obtained in 12 rag/L, which was 59% , 57% and 52% respectively. The floe sedimentation velocity was fast which formed by FeC13 and PAC. The complete sedimentation could get in 20 to 30 min, and the sedimentation time of dosing AS was more than 40 min. The adaptable test was conducted in the relation of optimal dosage of PAC, turbidity and UV254 in pilot system, and the results were good.

关 键 词：低温低浊水 丹江口水库 混凝剂 

分 类 号：TU991.2[建筑科学—市政工程]