Coagulation performance and residual aluminum speciation of Al2(SO4)3 and polyaluminum chloride (PAC) in Yellow River water treatment.
Coagulation performance and residual aluminum speciation of Al2(SO4)3 and polyaluminum chloride (PAC) in Yellow River water treatment.
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DOI：
10.1016/j.cej.2010.08.076
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发表时间：
2010-11
影响因子：
15.1
通讯作者：
Zhonglian Yang;B. Gao;Q. Yue
中科院分区：
文献类型：
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作者：
Zhonglian Yang;B. Gao;Q. Yue
研究了pH值和混凝剂投加量对硫酸铝和聚合氯化铝（PAC）混凝处理黄河水性能的影响。对残留铝形态进行了分离和测定。结果表明，在处理黄河水的大多数情况下，PAC表现出比Al 2（SO 4）3更优越的上级混凝性能。当Al 2 O3投加量为15 mg/L时，PAC对浊度、UV 254和DOC的最佳去除率分别为96.3%、57.1%和32.7%，而Al 2（SO 4）3对浊度、UV 254和DOC的最佳去除率分别为94.5%、53.5%和34.8%。PAC和Al_2（SO_4）_3处理黄河水的最佳pH值为6.0。不同形态的残留铝随投加量和pH值的变化趋势不同。对于所研究的两种混凝剂，无论投加量还是pH值，残余总铝的绝大部分以溶解态总铝的形式存在，其中溶解态有机结合态铝是主要形态。出水中溶解态单体铝大部分为无机结合态单体铝，除溶解态有机结合态铝外，PAC对几种残留形态铝的浓度均较低，且PAC能有效降低溶解态单体铝的浓度。
The effect of pH and coagulant dosage on the coagulation performance of aluminum sulphate and polyaluminum chloride (PAC) with respect to the treatment of Yellow River water was investigated in this paper. The separation and measurement of residual aluminum (Al) speciation were also conducted. The results indicated that PAC showed superior coagulation performance compared to that of Al2(SO4)3in most cases during the Yellow River water treatment. At a dosage of 15mg/L as Al2O3, PAC achieved an optimum removal efficiency of turbidity, UV254and DOC of 96.3, 57.1, 32.7%, respectively, and Al2(SO4)3also achieved an optimum removal efficiency of turbidity, UV254and DOC of 94.5, 53.5 34.8%, respectively. For PAC and Al2(SO4)3, the optimum pH during the treatment of Yellow River water could be determined at 6.0. Different residual Al speciation exhibited different trends with dosage and pH variation. For the two coagulants studied, no matter the dosage or pH, the majority of residual total Al existed most in the form of total dissolved Al, among which, dissolved organically bound Al was the predominant speciation. Most of the dissolved monomeric Al in the effluent was dissolved inorganically bound monomeric Al. PAC showed lower concentration for the several kinds of residual aluminum species, except the dissolved organically bound Al; and PAC could effectively reduce the concentration of dissolved monomeric Al.