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冬季水温降至10度以下,国内某些以聚合氯化铝(碱式氯化铝)作混凝剂的单位,因混凝作用显著下降,出水浑浊度达不到要求,而不得不改用其他混凝剂。因此,有人认为聚合氯化铝与一般铝盐的作用相似,在低温时水解作用缓慢,所以混凝作用差。其实不然,日本冬季气温比我国南方低,丰田环吉在工业用水及其水质管理一书中明确指出:聚合氯化铝因为直接给出高价氢氧化
In winter, the water temperature dropped below 10 degrees. Some domestic units that used polyaluminum chloride (alkaline aluminum chloride) as a coagulant had a significant drop in coagulation, and the turbidity of the effluent did not meet the requirements, and they had to be replaced. Other coagulants. Therefore, some people believe that the role of polyaluminum chloride is similar to that of normal aluminum salts, and the hydrolysis is slow at low temperatures, so coagulation is poor. In fact, Japan’s winter temperatures are lower than in southern China. Toyota’s Kyrgyzstan clearly stated in the book “Industrial Water and Water Quality Management: Polyaluminum Chloride Directly Given High Hydroxyl Hydroxides.