Optimising natural organic matter removal from low turbidity waters by controlled pH adjustment of aluminium coagulation

被引:293
作者
Gregor, JE [1 ]
Nokes, CJ [1 ]
Fenton, E [1 ]
机构
[1] Inst Environm Sci & Res Ltd, Christchurch, New Zealand
关键词
coagulation; humic substances; pH control; nucleation; complexation;
D O I
10.1016/S0043-1354(97)00154-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 [工学]; 0830 [环境科学与工程];
摘要
Effective removal of soluble natural organic matter (NOM) from low-turbidity waters can be achieved by aluminium coagulation provided due attention is paid to micro-flee formation (coagulation) and macro-flee development (flocculation). This work provides guidelines and an explanation of how pH should be controlled to maximise soluble NOM removal while at the same time making full use of pH-influencing chemicals (acid, alum, and lime). For low-turbidity waters, essential flee nucleating sites can be provided by the lime that is used for pH and alkalinity adjustment, Provided that the lime is added in sufficient quantity and at a point where it retains some of its particulate nature, i.e. immediately after coagulant addition. Adjusting the pH downwards to between 4 and 5 prior to coagulant addition allows the formation of soluble NOM-aluminium complexes that link to each other, thereby forming large insoluble bridged complexes (micro-flocs), that also:act as nuclei for macro-flee development (flocculation). (C) 1997 Elsevier Science Ltd.
引用
收藏
页码:2949 / 2958
页数:10
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