Improved land-treatment-system with slow rate for sewage and its test

Traditional land-treatment-system with slow rate is mainly used to treat sewage and make use of water resources. The hydraulic load of this kind of system is low. A kind of improved method that added a drainage system at 1m depth in soil was introduced in this paper to enhance the system hydraulic load. Experimental results indicated that the disposal effect of contaminations of improved land-treatment-system with slow rate run well and that the discharged water quality treated by the system was satisfied and could meet the standard of surface water quality standard Ⅲ except total nitrogen index.