DOMESTIC WASTE WATER TREATMENT METHOD Russian patent published in 1994 - IPC

FIELD: purification of highly confederated domestic and city sewage. SUBSTANCE: highly concentrated sewage, toxic impurities of which significantly exceed maximum permissible concentration, are subjected to mechanical treatment to separate coarse mineral impurities and treatment by chemical reagent in a mixer. Received sediment is removed and brought to methane tank to get CH₄. Purified water is subjected to treatment by pulsed ultra violet emission of full spectrum in wave length range of 200 - 300 nm with pulse duration of 10^-6-5·10^-4 s and emission flux density per unit of treated water surface not less than 100 kW/m². After that water is filtered through crushed zeolite with speed of no more than 6 m/h. Zeolite is fed toward movement of purified water stream. EFFECT: method provides high degree of sewage purification, that meets ecologically safe norms, and provides for full utilization and secondary industrial use of filtered wastes and purified water. 1 dwg, 1 tbl