强化供氧条件下潜流型人工湿地运行特性

针对潜流型人工湿地中溶解氧浓度和脱氮率偏低的问题，试验研究了强化供氧对植物和微生物的影响及人工湿地内溶解氧浓度、净化效率的变化规律.结果表明，强化供氧宜在湿地前端进行，最佳气水比为6左右，可采用连续供氧方式.供氧对湿地植物生理特性无明显不良影响，可显著增加湿地中硝化菌、反硝化菌数量，硝化菌可比供氧前高出1～2个数量级，反硝化菌高出1个数量级.强化供氧有效改善了湿地内氧环境，供氧前湿地内溶氧浓度普遍低于0.6 mg/L，供氧后氧浓度上升至1 mg/L以上.强化供氧有利于各类污染物质尤其是有机物和氮类物质的去除，有机物去除率比原湿地高出10％左右, TN去除率能够达到60％以上.因此，强化充氧措施具有较好的研究和应用价值.

Study on Running Characteristics of Aerating Subsurface Flow Wetlands

Aim at the low dissolved oxygen concentration and nitrogen removing efficiency in constructed wetlands, the running parameters of aeration measure, influence on plants and bacteria, the dissolved oxygen concentration and purifying efficiency after aeration were studied by experiments. The results show that aeration should be run in the forepart of wetland. The best gas-flow ratio is 6. Continuous aeration is adopted. The influence of aeration on plants in wetlands is inconspicuous. The quantity of nitrifying bacteria and denitrifying bacteria are increased. Aeration measure improves the oxygen condition, which is under 0.6mg/L before aeration but over 1mg/L after aeration. The purifying efficiency of wetlands is improved, removing efficiency of organic matter increase 10%, and removing efficiency of total nitrogen is higher than 60%. So aeration measure has the value of research and application.