塘-湿地复合生态系统处理石油化工废水的效能

Efficacy of pond-wetland combined eco-system treating petrochemical wastewater

应用多级塘（厌氧塘，兼性塘，好氧塘和冬季储留塘）湿地复合生态系统对石油化工废水进行强化处理和利用，处理能力10万m^3／d。结果表明，多级塘湿地复合生态系统在寒冷地区对石油化工废水处理效果良好，最终处理单元芦苇湿地出水的COD、BOD5、TN、NH4^＋-N、TP和石油类物质的平均值分别可达到7508，7．51，10．63，5．12，0．5，4．63mg／L．植物生长季节（5～10月），系统对各污染物的去除效果均优于非植物生长季节，系统中的储留塘可实现污水在冬季（11月～裂年5月）的零排放，保证全年处理效果。

The eco-system of combined multistage pond （Anaerobic pond, facultative pond, aerobic pond and winter lagoon）-wetland was applied to carry out the enhanced treatment and utilization of petrochemical wastewater, with treatment capacity of 10,0000m^3/d; and in cold region, the combined eco-system showed good treating efficiency of petrochemical wastewater, the average values of COD, BOD5, TN, NH4^＋-N, TP and patron matter of effluent water from last treated unit reed wetland could reach 75,08, 7.51, 10.63, 5.12, 0.5mg/L and oil 4.63mg/L respectively. In plants growing seasons （May to October）, the system＇s removal efficiency of each pollutant was better than the plants un-growing seasons; meanwhile, the storage pond of the system could achieve zero discharge of the wastewater in cold seasons （November to next May）, which could guarantee the whole year＇s treating efficiency.