上下回流人工湿地预处理微污染水库水的研究

Study on pre-treatment of the micro-polluted reservoir water by subsurface up and down flow constructed wetland

采用上下回流潜流人工湿地对微污染水库水进行预处理试验。根据试验数据,构建了上下回流潜流人工湿地系统CODCr、TN、TP的一级动力学模拟方程。结果表明:在水力负荷为0.4m3/(m2.d)条件下,CODCr、TN、NH3-N、TP的平均去除率均分别达到56.06%、58.97%、55.91%和50.56%。湿地系统夏季处理效果明显好于其他季节。使用周期按20年考虑,日均进水量3.6m3/d,湿地建设成本为2100元,水的处理成本为0.13元/m3,这表明采用人工湿地预处理微污染水库水是经济可行的。

The pre-treatment of micro-polluted reservoir water by subsurface up and down flow constructed wetland was carried out. According to experimental data, first order kinetic simulation equations of chemical oxygen demand（CODcr）, total nitrogen（TN） and total phosphorus （TP） of the subsurface up and down flow constructed wetland were established. The results showed that when the hydraulic loading was 0. 4 m^3/（m^2 · d）, the average removal rates of CODcr, TN, ammoniacal nitrogen（NH3-N）, and TP in up and down flow constructed wetland were 56. 06%, 58. 97 %, 55. 91% and 50. 56% respectively. Removal efficiency of the system in summer was obvious higher than that in other season. The expenditure of construction of the constructed wetland with the average treating capacity of 3. 6 m^3/d and 20 years of lifetime would be 2 100 RMB, and the average disposal cost would be summed up to 0. 13 RMB/ m^3, which shows pretreatment of micro-polluted reservoir water by constructed wetland should be feasible.