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《Environmental Science》 2009-04
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Analysis of the Secondary Effluent of Municipal Wastewater in North China

WANG Shu-tao~1,WANG Hong~2,MA Jun~1,ZHANG Guang-de~3,LIU Hui-ling~1(1.School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China;2.Harbin Drainage Limited Company,Harbin 150010,China;3.Assessment Center of Environmental Engineering of Harbin,Harbin 150076,China)  
The secondary effluent from a municipal sewage treatment plant was fractionated into three parts: the dissolved,the near-colloidal and the suspended. The variation of each composition was investigated individually during winter,spring and summer.The fractionation study revealed that the dissolved COD and DOC accounted for 78.2%-86.5% of total COD and 82.6%-86.6% of TOC,respectively.The molecular weight distribution(MWD) of the secondary effluent indicated that the organics with molecular weight(MW)(1?000) accounted for 56.3%-62.8% of total organics.The organic components constituted 75.54%-89.93% of the mixture of suspended and near-colloidal matter.The size distribution of the particles showed that the particles ranging from 2.00 to 6.84 μm constituted more than 80% of the total particles.The secondary effluent was relatively poor biodegradable with only 0.195-0.283 of BOD_5/COD ratio and 0.156-0.26 of BDOC/DOC ratio.The(GC/MS) analysis detected 43 and 26 kinds of compounds in dissolved and in suspended forms,respectively,and most of them are bio-refractory according to the functional groups of the chemicals.Biodegradability of the secondary effluent should be enhanced for improving the sequential biochemical removal efficiency for the organic matter.
【Fund】: 教育部科技创新重大项目培育基金项目(705013);; 城市水资源与水环境国家重点实验室开放研究项目(QA200812)
【CateGory Index】: X703.1
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