河岸渗滤系统净化再生水效果试验研究

发布时间：2018-04-17 23:26

  本文选题：再生水 + 河岸渗滤系统　； 参考：《农业机械学报》2017年05期

【摘要】：以北京市清河再生水厂出水为研究对象,构建100 cm土柱模拟河岸渗滤系统,研究长周期供水条件下,持续淹水与交替淹水落干2种补水方式下渗滤系统对再生水中有机物和总氮(TN)的净化效果及系统稳定性。通过3年的试验研究发现,持续淹水与交替淹水落干补水方式下,渗滤系统对再生水中有机物的平均去除率分别为40.5%和50.8%,交替淹水落干补水方式对有机物去除效果略优于持续淹水的情况。有机物的去除主要发生在溶解氧浓度较高、微生物数量最多的上部0~40 cm土层范围内。2种补水条件下渗滤系统对有机物的去除率在年际间变化不大,系统净化性能稳定。2种补水方式下渗滤系统对TN的平均去除率分别为31.2%和80.7%,交替淹水落干补水方式对TN的去除效果明显优于持续淹水的情况。2种补水条件下渗滤系统对TN的去除率逐年增大,系统净化性能随时间呈增强趋势。试验期间,水温在15~31℃范围内变化时,2种渗滤系统对TN的去除率随温度的增大呈指数或对数趋势增加,当温度在30℃以上时,交替淹水落干补水方式下系统对TN的去除率最高可达90%以上。再生水经过河岸渗滤系统后,总氮和有机物能够得到有效的去除,再生水回补河湖对地下水污染的风险大幅降低。
[Abstract]:Taking the effluent of Qinghe Recycling Water Plant in Beijing as the research object, a 100 cm soil column simulated riverbank leachate system was constructed to study the condition of long period water supply.The purification effect and system stability of organic matter and TNN in regenerated water by continuous flooding and alternate flooding.After 3 years of experimental study, it is found that under the way of continuous flooding and alternate flooding,The average removal rates of organic matter in regenerated water by leachate system were 40.5% and 50.8% respectively.The removal rate of organic matter mainly occurred in the upper 0 ~ 40 cm soil layer, where the dissolved oxygen concentration was relatively high, and the removal rate of organic matter by the leachate system had little change in different years.The average removal rate of TN was 31.2% and 80.7, respectively. The removal efficiency of TN by alternate flooding method was better than that under continuous flooding condition (.2%).The removal rate of TN is increasing year by year.The purification performance of the system increases with time.During the test period, the TN removal efficiency of the two leachate systems increased exponentially or logarithmically with the increase of temperature when the water temperature varied from 15 鈩，

本文编号：1765783