土地渗滤系统与膜分离系统组合处理农村生活污水研究

Research on the Combination of Land Infiltration System and Membrane Separation System to Treat Rural Domestic Sewage

通过将土地渗滤系统与膜分离系统进行组合,解决单独土地渗滤系统对悬浮物(SS)去除效果差以及单独膜分离系统膜污染和膜通量降低的问题,其中土地渗滤系统作为第一步处理,膜分离系统作为第二步处理。通过检测单独土地渗滤系统和组合系统出水SS、COD、NH_(3)-N、总磷TP来探究组合处理对污染物的处理效果,通过单独膜分离系统和组合系统膜通量、电镜分析以及实物对比探究组合处理对膜污染的改善情况。结果表明,单独土地渗滤系统处理对SS、COD、NH_(3)-N、TP的平均去除率分别是63.59%、82.72%、91.67%、64.80%,使用寿命为1259天;组合系统对SS、COD、NH_(3)-N、TP的平均去除率分别是98.21%、94.48%、95.70%、71.13%,使用寿命为2863天。经过15次污水处理,单独膜分离系统膜通量为11.19 L/(m^(2)·h),组合系统膜通量为20.22 L/(m^(2)·h);通过电镜分析和实物图对比组合系统膜表面污染物沉积更少。组合系统处理效果好、处理成本低,具有在农村地区推广的潜力。

By combining the land infiltration system with the membrane separation system,the problem of poor removal of suspended solids(SS)in a single land infiltration system and reduced membrane flux of a single membrane separation system can be solved.The land infiltration system is used as the first step and the membrane separation system is used as the second step.The improvement effect of combined treatment on pollutant removal is explored by analyzing the effluent SS,chemical oxygen demand(COD),ammonia nitrogen(NH_(3)-N)and total phosphorus(TP)of the single land infiltration system and the combined system.The improvement of the membrane fouling by the combined treatment is explored by calculating the membrane flux,electron microscopy analysis and physical comparison of the single membrane separation system and the combined system.The results showed that the average removal rates of SS,COD,NH_(3)-N and TP by the separate land infiltration system treatment were 63.59%,82.72%,91.67%and 64.80%,respectively,and the service life was 1259 days.The average removal rates of the combined system for SS,COD,NH_(3)-N and TP were 98.21%,94.48%,95.67%and 71.13%,respectively,and the service life was 2863 days.After 15 times of sewage treatment,the membrane flux of the single membrane separation system was 11.19 L/(m^(2)·h),and the membrane flux of the combined system was 20.22 L/(m^(2)·h).Electron microscopy analysis and physical map comparison showed less contaminant deposition on the film surface of the combined system.The combined system has superior effect and low cost,and has the potential to be promoted in the rural areas.