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研究了氯化铝、硫酸铝、聚合氯化铝(poly-aluminum chloride,PAC)3种铝盐混凝剂在腐殖酸-高岭土模拟水样中的应用,以比较3种混凝剂在该水样中的混凝效果与残留铝含量和组分之间的关系.结果表明,3种铝盐混凝剂在试验选取的投加量下对浊度和UV254的去除率最高可达90%左右,PAC能在较高的投加量下达到较好的混凝效果;较高投加量下PAC混凝沉淀出水中残留总铝含量为0.9mg/L左右,余铝率为-3.0%左右,均明显低于传统的铝盐混凝剂;3种混凝剂混凝处理腐殖酸-高岭土模拟水样时,残留铝均大部分以溶解性总铝的形式存在,且溶解性有机铝在总溶解性铝中所占比例较大;PAC在腐殖酸-高岭土混凝沉淀出水中残留总铝的含量下降最快,且能够有效降低出水中毒性较大的溶解性铝的含量,其混凝沉淀出水中残留总溶解性铝含量为0.6mg/L左右.
The application of three kinds of aluminum salt coagulants, such as aluminum chloride, aluminum sulfate and poly-aluminum chloride (PAC), in humic acid-kaolin simulated water samples was studied to compare the effect of three kinds of coagulants The results show that the removal rate of turbidity and UV254 can reach 90% at the dosage of three kinds of aluminum salt coagulants, , The PAC can achieve better coagulation effect under higher dosage; the residual total aluminum content in PAC coagulation sedimentation effluent is about 0.9mg / L at high dosage, the residual aluminum ratio is -3.0% , Which were significantly lower than those of the traditional aluminum salt coagulant. When coagulant-coagulated humic acid-kaolinite was simulated by three kinds of coagulants, most of the residual aluminum existed in the form of dissolved total aluminum, and dissolved organic Al accounted for a large proportion of the total dissolved aluminum; PAC in the humic acid - kaolin coagulation precipitation of the total residual aluminum content decreased the fastest, and can effectively reduce the effluent toxicity of the larger soluble aluminum content, The total residual aluminum content in the coagulation sedimentation effluent is about 0.6 mg / L.