Coagulation in Drinking Water Treatment: Particles, Organics and Coagulants
Coagulation in Drinking Water Treatment: Particles, Organics and Coagulants
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DOI：
10.2166/wst.1993.0261
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发表时间：
1993-06
影响因子：
2.7
通讯作者：
J. K. Edzwald
中科院分区：
文献类型：
--
作者：
J. K. Edzwald
提出了饮用水处理中的凝血的综述。本文强调了原始水化学，天然有机物（NOM）浓度和类型以及凝结剂化学的重要性。由于静电电荷相互作用，亲水作用或吸附的大分子的空间相互作用，矿物和有机颗粒可能在水中稳定。最初在水供应中而不是颗粒可以控制凝血剂量和选择。妈妈由各种有机化合物的混合物组成，包括疏水性（腐殖酸和富富酸）和亲水性馏分。疏水酸的负电荷和化学结构会影响凝血剂，尤其是金属凝结剂的化学反应。用Al凝结剂去除NOM可以涉及水解，络合，降水和吸附反应。特定的紫外线吸收（SUVA）可用于估计水的名称是疏水酸的高还是低，并通过凝结来估计DOC的去除。含有藻类的水供应的预元可能会导致微量汇总或损害凝血，具体取决于细胞外有机物（EOM）（EOM）和臭氧剂量的藻类类型，浓度和分子量。
A review of coagulation in drinking water treatment is presented. The paper emphasizes the importance of raw water chemistry, natural organic matter (NOM) concentration and type, and the chemistry of coagulants. Mineral and organic particles may be stable in water due to electrostatic charge interactions, hydrophilic effects, or to steric interactions from adsorbed macromolecules. NOM rather than particles initially in water supplies can control coagulant dosages and selection. MOM consists of a mixture of various organic compounds including hydrophobic (humic and fulvic acids) and hydrophilic fractions. The negative charge and chemical structure of the hydrophobic acids affect chemical reactions with coagulants, particularly metal based coagulants. The removal of NOM with Al coagulants can involve hydrolysis, complexation, precipitation, and adsorption reactions. Specific ultraviolet absorbance (SUVA) can be used to estimate whether the NOM of a water is high or low in hydrophobic acids and to estimate removals of DOC by coagulation. Preozonation of water supplies containing algae may lead to microflocculation or impair coagulation depending on algae type, concentration and molecular weight of extracellular organic matter (EOM), and ozone dose.