THE STUDY FOR SEWAGE TREATMENT EFFICIENCY OF CHANNEL-DYKE AND BROAD IRRIGATION SYSTEMS

The treatment efficiency of the channel-dyke and broad irrigation systemswith eleven kinds of plants was studied. The channel-dyke system with napiergrass(Pennisetam purpurem Schumach. ×Pennisetum alopecuroides (L.) Spreng American)had high treatment efficiency, the removal rates of TP, Phosphate, TN, NH3-N,CODcr and BOD5 were 83.2, 83.6, 76.3, 74.9, 73.5 and 85.8%, respechvely. TheOLF systems with rice I-yuanyou No. 1(88-132) (Oryza sativa L.) and riceⅡ-suakoko8 (Oryza glaberrima) and the channel-dyke unit with flattened hemarthria(Hemarthria compressa (L. F) R.Br) also had high treatment efficiency. In autumnand winter, the treatment efficiency could be improved by using the plastic shed. Thetreatment efficiency of the channel-dyke and the broad irrigation systems couldcorrelate with the yield of biomass and the planting mode of the plant.