表流人工湿地COD去除影响因素研究  

Study on Influencing Factors of COD Removal in Surface Flow Constructed Wetland

作　　者：徐斌[1] 陈翔[1,2] 武周虎[1] 李修岭[3] 

机构地区：[1]青岛理工大学环境与市政工程学院,山东青岛266033 [2]青岛农业大学资源与环境学院,山东青岛266109 [3]临沂大学水土保持与环境保育研究所,山东临沂276000

出　　处：《绿色科技》2017年第8期28-31,共4页Journal of Green Science and Technology

基　　金：山东省环境保护重点科技项目(编号:2003-01);临沂市科技发展计划(编号:201412025)

摘　　要：研究了表流人工湿地系统中COD去除率的影响因素,根据南四湖、东平湖表流人工湿地中试试验基地3年的COD、DO、HRT、温度、植物要素等的监测结果,分析了系统不同运行条件下的COD去除率。结果表明:在未校正由较大渗透量引起的污染物浓缩情况下该中试系统对COD的平均去除率为26.4%,且去除场所主要位于湿地A段,占72%;在进水COD浓度60~120.3mg/L范围内,出水COD浓度随系统进水COD浓度呈线性变化,表流人工湿地系统不具备高效处理的能力。系统的COD去除率在5~10月份逐月增长,10月份达到最大33.9%;COD去除率与溶解氧浓度具有大致同步的增减变化过程,且溶解氧的补给主要依靠大气复氧;在HRT月平均值范围2~12d内,COD去除率随HRT的延长而提高,较长的水力停留时间有利于提高COD去除率,但会降低去除COD的能力。The study aimed to explore the influencing factors of COD removal in surface flow constructed wetland. Based on the monitoring results of COD, DO, HRT, temperature and plant elements in the test base of Nansi Lake and Dongping Lake, this paper analyzed the COD removal rate in different operating conditions. The results showed the average removal rate of COD in the pilot system was 26.4% when the contaminant concentration was not correc- ted by the large amount of permeation. And the removal site was mainly in the wetland A accounting for 72%. When the influent COD concentration is in the range of 60--120.3mg/L, the effluent COD concentration change is linearly with the influent COD concentration. And the surface flow constructed wetland system does not have effective abili- ty. The COD removal efficiency gradually increased from May to October and it reached maximum 33.9 ~ in Octo- ber. The curve of COD removal efficiency has the same trend with the dissolved oxygen concentration. Moreover, the supply of dissolved oxygen mainly relies on atmospheric reoxygenation. In the HRT monthly range of 2 to 12 days, COD removal rate increased with the extension of HRT. Longer hydraulic retention time is conducive to improve the COD removal rate, but will reduce the COD removal capacitv.

关 键 词：人工湿地 污水处理 COD去除 影响因素 

分 类 号：X703[环境科学与工程—环境工程]