人工曝气不同气水比下人工湿地堵塞现状  

The Artificial Wetland Clogging Status Under Artificial Aeration of Different Gas-water Ratio

作　　者：祁建民[1] 黄治军[1] 傅高健 倪利晓[2] 洪建 QI Jian-min;HUANG Zhi-jun;FU Gao-jian;NI Li-xiao;HONG Jian(Jiangsu Fangtian Electric Power Technology Co.,Ltd,Nanjing 211102,China;College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]江苏方天电力技术有限公司,江苏南京211102 [2]河海大学,江苏南京210098

出　　处：《环境科技》2019年第5期6-11,共6页Environmental Science and Technology

基　　金：国家自然科学基金(51779079);江苏省自然科学基金（BK-20181313）;江苏省水利科技项目（2018037）;江苏方天电力项目(819049016)

摘　　要：人工湿地在缺氧条件下,微生物的有氧呼吸受到抑制,有机物不能得到充分的转化的同时,一些还原态的元素及有机物会大量积聚,达到有毒的水平,DO是否充足是人工湿地运行效率的重要限制因素之一。因此,提取基质及水体样品分析不同气水比下孔隙率衰减度及分布情况,同时分析实际水力停留时间的变化情况及DO状况,并综合以上分析评估不同气水比下的堵塞现状。结果表明,随着气水比的增强,堵塞现状也得到了相应的改善,各组反应器的孔隙率衰减率分别为24.4%(未曝气组),13.3%(低曝气组),8.9%(中曝气组)与3.8%(高曝气组),而曝气组的最高水力停留时间衰减率仅为未曝气组的30%,显示出了良好的水力状态控制效果。Under the condition of hypoxia, the aerobic respiration of microorganisms in the constructed wetland is inhibited, and the organic matter can't be fully transformed.At the same time, some reduced elements and organic matter will accumulate in large quantities and reach the toxic level.Therefore, the adequacy of dissolved oxygen is one of the important limiting factors for the operating efficiency of constructed wetlands.The matrix and water samples were extracted in this paper to analyze the porosity attenuation and distribution under different gas-water ratios, as well as the variation of the actual hydraulic retention time and the dissolved oxygen condition.Moreover, the clogging status under different gas-water ratios was evaluated based on the above analysis.The results show that with the increase of the gas-water ratio congestion status also got the corresponding improvement, porosity of the reactor constituting the attenuation rate of 24.4%(without aeration group), 13.3%(low aeration group), 8.9%(aeration group) and 3.8%(high aeration group), the highest hydraulic retention time and aeration group attenuation rate is only 30% of the group without aeration, showed a good state of hydraulic control effect.

关 键 词：人工湿地 堵塞 气水比 

分 类 号：X5[环境科学与工程—环境工程]