| 我国北方城市污水处理厂二级处理出水的水质特性 |
| 摘要点击 2124 全文点击 1708 投稿时间：2008-05-21 修订日期：2008-08-11 |
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| 中文关键词 二级出水 水质分析 有机物分离 污水回用 |
| 英文关键词 secondary effluent analysis of water characteristic organic matter fractionation water reuse |
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| 中文摘要 |
| 将生活污水二级处理出水分离为悬浮态、近胶体态和溶解态物质，并分别进行了分析.结果表明，溶解态COD占二级出水总COD的78.2%～86.5%，而悬浮态COD仅占10.1%～17.0%，近胶体态COD最高占4.8%；溶解态TOC占二级出水总TOC的82.6%～86.6%；悬浮物中有机组分占物质总量的75.54%～89.93%；二级出水中80%的颗粒分布在2.00～6.84 μm之间；二级出水的可生化性较差：BOD5/COD为0.19５～0.28３， BDOC/DOC为0.156～0.26.溶解性有机物和悬浮性有机物的GC/MS分析表明，具有环状结构的化合物分别占各自总化合物的58%和35%.分析认为，二级出水中大多为难降解有机物，可生化性很差，要实现较高的去除效率，必须首先改善其可生化性，才能充分发挥后续生化工艺净化有机物的潜力. |
| 英文摘要 |
| 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 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. |
