| 人工湿地设计及运行参数对挥发性烷基硫化物去除的影响 |
| 摘要点击 3150 全文点击 2632 投稿时间：2009-03-15 修订日期：2009-07-13 |
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| 中文关键词 潜流人工湿地 二甲基硫 二甲基二硫 挥发性烷基硫化物 |
| 英文关键词 subsurface constructed wetlands dimethylsulfide(DMS) dimethyldisulfide(DMDS) volatile alkylsulfides |
| DOI 10.13227/j.hjkx.20100211 |
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| 中文摘要 |
| 以中试规模的潜流人工湿地水处理试验场为对象，研究了床体长宽比、填料粒径、水位、水力负荷和温度(季节)等设计及运行参数对二甲基硫(DMS)及二甲基二硫(DMDS)等挥发性烷基硫化物去除的影响．通过1 a的运行及监测分析，结果表明，当湿地系统水力负荷为12～86 cm·d-1时，人工湿地系统对所研究的挥发性烷基硫化物具有很好地去除作用，对DMS及DMDS的去除率分别为86%及95%；方差分析表明，水力负荷和温度(季节)是影响所研究的污染物去除的2个主要因素；水力负荷对出口水中DMS的浓度 |
| 英文摘要 |
| A pilot-scale subsurface constructed wetland wastewater treatment system was sampled for one year to study the effects of bed aspect ratio, substrate medium size, water depth, HLR (hydraulic loading rate) and temperature (season) on removal of volatile alkylsulfides such as DMS (dimethylsulfide) and DMDS (dimethyldisulfide). The yearly experimental results demonstrated that the system showed good performance for DMS and DMDS removal in wastewater under different HLR ranging from 12 cm·d-1 to 86 cm·d-1. The system could remove 86% of DMS, and 95% of DMDS, respectively. ANOVA statistical analysis shows that HLR and temperature (season) are major factors controlling the system performance for the target analytes. According to ANOVA test, the HLR caused significant differences (p<0.01) on the average DMS effluent concentrations, and temperature (season) caused significant differences (p<0.01) on the average DMS and DMDS effluent concentrations. However, bed aspect ratio, substrate medium size and water depth did not cause significant differences (p>0.05) on the average DMS and DMDS effluent concentrations. A survey of dissolved oxygen and ORP indicates that the constructed wetlands system showed strong reduced condition. On the basis of investigations of electron acceptors (such as SO2-4, NO-3 and NO-2) and dissolved organic pollutants (such as TOC and acetic acid) concentrations along with the length of constructed wetlands, it can be concluded that sulfate reduction and methanogenisis were estimated to be significant for DMS and DMDS removal in constructed wetland beds. |
