凝结
絮凝作用
水处理
化学
有机质
原水
沉积作用
气味
天然有机质
环境化学
过滤(数学)
水质
制浆造纸工业
Geosmin公司
地表水
污染物
环境工程
环境科学
有机化学
沉积物
地质学
心理学
古生物学
生态学
统计
数学
精神科
工程类
生物
作者
Anu Matilainen,Mikko Vepsäläinen,Mika Sillanpää
标识
DOI:10.1016/j.cis.2010.06.007
摘要
Natural organic matter (NOM) is found in all surface, ground and soil waters. An increase in the amount of NOM has been observed over the past 10-20 years in raw water supplies in several areas, which has a significant effect on drinking water treatment. The presence of NOM causes many problems in drinking water and drinking water treatment processes, including (i) negative effect on water quality by causing colour, taste and odor problems, (ii) increased coagulant and disinfectant doses (which in turn results in increased sludge volumes and production of harmful disinfection by-products), (iii) promoted biological growth in distribution system, and (iv) increased levels of complexed heavy metals and adsorbed organic pollutants. NOM can be removed from drinking water by several treatment options, of which the most common and economically feasible processes are considered to be coagulation and flocculation followed by sedimentation/flotation and sand filtration. Most of the NOM can be removed by coagulation, although, the hydrophobic fraction and high molar mass compounds of NOM are removed more efficiently than hydrophilic fraction and the low molar mass compounds. Thus, enhanced and/or optimized coagulation, as well as new process alternatives for the better removal of NOM by coagulation process has been suggested. In the present work, an overview of the recent research dealing with coagulation and flocculation in the removal of NOM from drinking water is presented.
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