Comparable evaluation of various commercially available aluminium‐based coagulants for the treatment of surface water and for the post‐treatment of urban wastewater
Comparable evaluation of various commercially available aluminium‐based coagulants for the treatment of surface water and for the post‐treatment of urban wastewater
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DOI：
10.1002/jctb.1300
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发表时间：
2005-10
影响因子：
3.4
通讯作者：
A. Zouboulis;G. Traskas
中科院分区：
文献类型：
--
作者：
A. Zouboulis;G. Traskas
本研究考察了各种市售混凝剂，如明矾和聚合氯化铝(PACLS)对地表水(河水)的处理效果，以及对经过生物处理的城市污水的后处理效果。以城市污水处理为例，比较了不同混凝剂对悬浮物(SS)、天然有机物(NOM)、残留铝浓度和磷酸盐(无机磷)的去除效果。为了比较不同絮凝剂的絮凝速率和絮凝强度，还利用光度分散分析仪(PDA)研究了絮凝动力学。最后确定了最佳运行条件，即混凝剂投加量、pH值、温度、(初始)快速搅拌的时间和强度。可以普遍认为，PACL混凝剂优于明矾，因为它们具有更高的SS和NOM去除能力，更强和更大的絮体，更高的絮凝速率和更低的残余铝浓度，这是一个非常重要的因素，特别是对于饮用水地表水的处理。2005年化学工业学会
In this study the efficiency of various commercially-available coagulants, ie alum and poly- aluminium chlorides (PACls), for the treatment of surface (river) water, or for the post-treatment of biologically pretreated urban wastewater were investigated. The different coagulants were comparatively evaluated, considering the removal of suspended solids (SS), natural organic matter (NOM), as well as the residual aluminium concentration, and the removal of phosphates (inorganic phosphorus), in the case of urban wastewater treatment. The dynamics of flocculation were also studied using a Photometric Dispersion Analyser (PDA) in order to compare the flocculation rates and the strength of different coagulant flocs. Finally, the optimum operational conditions, ie coagulant dosage, pH, temperature, duration and intensity of (initial) rapid-mixing rate, were determined for the examined cases. It can be generally supported that PACl coagulants were superior to alum, as they presented higher SS and NOM removal, stronger and larger flocs, higher flocculation rates and lower residual aluminium concentration, which is a very important factor, especially for the treatment of surface water destinated for potable use. 2005 Society of Chemical Industry