复式潜流湿地净化生活污水的试验研究

研究了新型复式潜流人工湿地对生活污水的净化效果。在不同水力负荷、季节、曝气方式等条件下经过小试试验，分析了该湿地对污染物净化效果的影响。结果表明，该系统出水水质稳定，达到《城镇污水处理厂污染物排放标准》（GB18918--2002）的一级A标准。在水力负荷184mm·d。条件下COD、NH，一N去除率最大分别可达87．2％、68．9％。冬季低温条件下对各类污染物去除率仍大于20％。正交试验分析得知，最佳运行条件是气温28．6℃、水力负荷0．184m3·m-2·d-1、水力停留时间2．4d。对比试验表明，采用预曝气方式对湿地净化效果明显优于厌氧处理。

Experiment Research on Purifying Domestic Sewage by Duplex Subsurface Flow Constructed Wetlands

The purification effect on domestic sewage were researched in the new-type of duplex subsurface flow constructed wetlands, of which pollutants were analyzed through the small scale test on the purification effect under different conditions of hydraulic loading, season, aeration pattern. The results showed that water quality of the system was stabilized, which could reach the I class A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant（ GB 18918--2002 ）. The removal rate of COD, NH3-N could reach up to 87.2%, 68.9% under the conditions of the hydraulic load being 184 mm· d-1.And there were still more than 20% removal efficien- cy of various pollutants on the conditions of low temperature in winter. Orthogonal test showed that the optimum operating conditions was 28.6 ℃ for the temperature, 0.184 m3. m-2. d-1 for hydraulic loading, and 2.4 d for hydraulic retention time. The experimental research showed that pre-aeration was significantly better than the anaerobic treatment on purifying effect.