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Huan Jing Ke Xue. 2009 Apr 15;30(4):1099-104.

[Analysis of the secondary effluent of municipal wastewater in north China].

[Article in Chinese]

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  • 1School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, 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) < 1000 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 microm constituted more than 80% of the total particles. The secondary effluent was relatively poor biodegradable with only 0.195-0.283 of BOD5/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.

[PubMed - indexed for MEDLINE]
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