表面负荷对多介质土壤层系统处理污染河水的影响

Effect of Surface Load on Treatment of Polluted River Water by MSL System

采用多介质土壤层(MSL)系统处理受污染的入滇河水,研究不同表面负荷对系统处理效果的影响。4个月的运行结果表明,表面负荷对MSL系统去除污染物的影响显著。表面负荷减小、水力停留时间延长可显著提高对COD、NH3-N、TN、TP的去除效果,在800 L/(m2·d)的表面负荷下,出水COD、NH3-N、TP浓度达到《地表水环境质量标准》(GB 3838—2002)的Ⅳ类标准。各污染指标受表面负荷影响的强弱程度排序为NH3-N>TP>COD>TN。综合考虑对主要污染物的去除效果、削减负荷及经济效益,该多介质土壤层系统适宜采用的表面负荷为1 000～1 500 L/(m2·d)。

The effect of surface load on the treatment of polluted river water by the MSL system was observed. The results of four months of operation indicated that the removal efficiencies of COD, TN, NH3 - N and TP were effectively improved by reducing the surface load and extending HRT. Under the surface load of 800 L/（ m^2 · d）, the effluent concentrations of COD, NH3-N and TP met the class 1V criteria in the Environmental Quality Standard for Surface Water （GB 3838 -2002）. The sequence of factors affected by surface load in order was NH3-N 〉 TP 〉 COD 〉 TN. With a comprehensive consideration of the removal efficiency of pollutants, load reduction and economic effect, the most appropriate surface load of the MSL was suggested as 1 000 to 1 500 L/（ m^2 · d）.