Abstract： To make storm runoff and initial rainwater with poor quality meet the requirement of reuse, a combined split-flow device of roof initial rainwater was designed based on water quality control technology. The split-flow cell volume was regulated according to rainwater pollutants scouring law and rainfall intensity. The intercepted rainwater was penetrated directly into ground through the bottom permeable components. The split-flow device was mainly composed of regenerated resin, while the bottom permeable components were made up of aggregate and binder synthetic material. The test results show that with initial rainwater runoff discarding of 3 mm, 50%-70% pollutants of SS, turbidity and COD can be intercepted with the highest removal efficiencies of 74.95%，50.00%，60.90%, respectively. The designed device just need regular maintenance without any personnel management after rain.
2012, Vol. 33 
