RAIN AND STORM WATER PURIFICATION PLANT Russian patent published in 1999 - IPC

FIELD: sewage purification. SUBSTANCE: rain and storm water purification plant includes balancing reservoir 1, preliminary purification unit 2, sewage purification works 3 with pump station, unit of sorption filters and biological pond. Balancing reservoir 1 and preliminary purification unit 2 are manufactured in the form of vessel fitted with sand- collecting hopper 4, system 5 for loosening and washing away of settling, nonmetal pipes 6 perforated along entire length and through 180 deg of circumference in their lower parts and filled with material having developed surface and high coefficient of wettability of oil products with liquid species are placed on surface of water. Sewage purification works 3 are in addition equipped with thin-layer modules 7 whose shelves are fabricated from nonmetal pipes 8 having perforation along entire length and through 150 deg of circumference and placed with nonperforated side upwards. Pipes are filled with material having developed surface and high coefficient of wettability of oil products with liquid species. Sand-collecting hopper 4 is connected pump 9 to inlet branch pipe 10 of hydrocyclone which sledge branch pipe 11 is linked to hopper- collector 12 and outlet drain branch pipe 13 is connected to system 5 for loosening and washing away settling and to inlet collector 14 of purification works 3. Outlet of purified water from biological pond is provided with sorption screen filter. EFFECT: enhanced functional efficiency and reliability with simultaneous reduction of cost of plant. 4 cl, 1 dwg