新型潜流人工湿地净化微污染地表水的研究

Purification of Micro-polluted Surface Water by New Subsurface-flow Constructed Wetland

研究了好氧/厌氧多级串联潜流人工湿地对微污染地表水的净化效果及其工艺优化。结果表明,在受试填料中,火山石具有较大的比表面积和微生物附着能力,确定为该湿地系统的最佳填料。当人工湿地采用好氧/厌氧/好氧(体积比为1∶1∶1)结构时,对COD和氨氮的去除效果较好,但对NO3--N和TN的去除效果不佳;将湿地结构优化为好氧/缓冲/厌氧/好氧四级串联后,可明显提高脱氮效果,出水TN降至0.5 mg/L以下。

The purification effect of micro-polluted surface water by an aerobic/anaerobic multistage subsurface-flow constructed wetland and the process optimization were investigated. The results revealed that among the tested media, volcanic rock was the optimal medium for its larger specific surface area and higher microorganism adhesion capacity. The aerobic/anaerobic/aerobic subsurface-flow constructed wetland had significant effect on removal of COD and ammonia nitrogen, but no effect on removal of NO^-3-N and TN. The aerobic/buffering/anaerobic/aerobic subsurface-flow constructed wetland could significantly improve the removal efficiency of nitrogen. The effluent TN was reduced to tess than O. 5 mg/L.