运行条件下潜流型人工湿地溶氧状态研究

对种有多种植物的水平推流式潜流湿地处理污水厂初沉池出水的运行特性和氧分布状况以及人工湿地氧的空间分布和时间变化规律进行了较全面的研究.结果表明,人工湿地中氧浓度普遍较低,其空间分布呈现两边低、中间高的规律,垂直方向上沿层下降;其时间变化规律为夏季>春季>秋季>冬季,1天中14:00时氧浓度最高,上午高于下午.5种湿地植物的供氧能力比较结果为芦苇>美人蕉>茶花>富贵竹>空心菜.试验表明,人工湿地氧环境的研究有利于揭示湿地内部的净化机理,提高湿地的净化效率,具有一定的理论研究价值.

Study on the Oxygen Condition in Subsurface Flow Wetlands in Operation

Horizontal flow wetlands with various kinds of plants grown were studied on their operation characteristics and oxygen condition in treating the sewage out from the primary sedimentary basin.The rules of oxygen condition changed with space and time were studied.Researches showed the oxygen concentration was low in wetlands,and it appeared as a rule that low in both ends,but high in middle of beds.It descended in upright direction.The oxygen concentration changed with seasons as summer>spring>autumn>winter.In one day,the highest oxygen concentration appeared on 14:00,and the concentration was higher in forenoon than afternoon.Reed>canna>camellia>dracaena sanderiana>ipomoea aquatica forsk by comparison of ability of oxygen supply.Experiments demonstrate that the study of oxygen condition in constructed wetlands is propitious to reveal the purifying mechanism of wetlands and improve the purifying efficiency.