摘要：
针对低温、低浊、低碱度水,以聚合氯化铝为絮凝剂,通过烧杯试验,确定了生石灰(CaO)、阴离子型聚丙烯酰胺(APAM)、活化硅酸(AS)单独助凝的最优条件,进一步考察了APAM、AS分别与CaO联用的助凝效果。研究结果表明:5种助凝剂均能起到一定的助凝作用,但APAM、AS分别与CaO联用的助凝效果不理想。滞后聚合氯化铝30 s投加0.3 mg/L APAM,浊度去除率可达88.1%;AS投加时间对有机物去除效果影响显著,延迟聚合氯化铝30~60 s投加时,对CODMn和TOC去除效果最好。兼顾除浊和除有机物,AS助凝效果最佳,是提高混凝沉淀工艺污染物去除率的有效途径之一。
关键词:
低温低浊,
微污染,
碱度,
阴离子型聚丙烯酰胺,
活化硅酸,
吸附架桥
Abstract:
Aiming at wastewater with low temperature,low turbidity,and low alkaline,polyalumium chloride has been used as coagulant.It is determined that the optimum conditions for sole coagulant aids of calcium oxide(CaO),anionic polyacrylamide(APAM) and activated silicic acid(AS).The coagulant aid effectiveness of APAM and AS combined respectively with CaO is further investigated.The research results indicate that all of the five kinds of coagulant aids have coagulating capacity,to a certain extent.However,APAM and AS respectively combined jointly with CaO are not good.APAM is suitable for turbidity removal,the removing efficiency reaches up to 88.1% when 0.3 mg/L APAM is dosed 30 s after polyaluminum chloride.The dosing time of AS has a remarkable influence on organics removal,the best efficiency of CODMn and TOC removal could be obtained when added 30-60 s after polyaluminum chloride.It is efficient to evaluate and choose AS as flocculant aid with respect to turbidity and organic substance removal for increasing pollutants removing efficiency in coagulation and sedimentation.
Key words:
low temperature and low turbidity,
micro-pollution,
alkaline,
anionic polyacrylamide,
activated silicic acid,
adsorption bridging
中图分类号:
周志伟, 杨艳玲, 李星, 梁恒, 李圭白. 低温、低浊、低碱度水助凝效能试验研究[J]. 工业水处理, 2012, 32(3): 27-30,31.
Zhou Zhiwei, Yang Yanling, Li Xing, Liang Heng, Li Guibai. Efficiency of coagulation aids in the wastewater with low temperature,low turbidity,and low alkaline[J]. INDUSTRIAL WATER TREATMENT, 2012, 32(3): 27-30,31.