Patent EA-004338-B1 (EA)
Title: Method treatment of sewage water by biological way and a unit for realization of the method
IPC: C02F3/24
Filed: 2003-01-23
Abstract: 1. Method of sewage treatment, wherein crude sewage without a mechanical pre-treatment is supplied into the compensative tank, then into the activation tank, where the biological treatment takes place, and at least, to the settling tank, where activated sludge is separated from purified water, characterized in that in compensative tank rough sewage is crushed by means of periodical air injection and mixing. 2. Method of sewage treatment, according to claim 1, characterized in that air supplying to the compensative tank is realized when obtaining a minimal level on the surface in compensative tank. 3. Method of sewage treatment, according to claim 1, characterized in that air supplying to the compensative tank is finished when obtaining a working level of the surface in compensative tank. 4. Method of sewage treatment, according to claim 1, characterized in that air supplying to the compensative tank is realized in rigidly adjusted time intervals. 5. Method of sewage treatment, according to claim 1, characterized in that air is supplied to the activation tank and sludge tank, when pumping of sewage from compensative tank, to which air is not supplied, and where the hold-up of rough sewage is done. 6. Method of sewage treatment, according to claim 1 or 5, characterized in that while air supplying into the activation tank, the activation mixture is supplied from the activation tank to the settling tank, the activated sludge is going back through the opening on the bottom of the settling tank to the activation tank, and purified water is raising to outlet from treating unit and/or to the sand filter. 7. Method of sewage treatment, according to claim 1-6, characterized in that water is running from up to down, and filtrated water is pressed out to outlet by hydrostatic increased pressure, formed by the difference of water surface levels over sand filter and water surface on the drain, or by independent pump. 8. Method of sewage treatment, according to claim 1, characterized in that while air supplying into the compensative tank, the pumping of sewage from compensative tank to activation tank is stopped, and thereby the discharge of water from the treating unit. 9. Method of sewage treatment, according to claims 1-8, characterized in that while air supplying into the compensative tank, air is passing through the sand filter, activation tank, and transforming to quiescent state, the settler tank filling is stopped and the pump of removing of sludge of activation tank is turned on. 10. Method of sewage treatment, according to claims 1-9, characterized in that the inlet of the pump for removing the sludge in activation tank is located on such height over the bottom, that to leave under the inlet such quantity of settled activated sludge, that is optimal for biological treatment process. 11. Method of sewage treatment, according to claims 1-9, characterized in that, when air is supplied to the sand filter, polluted water is leaving from the filter surface. 12. Activation unit of sewage with activated sludge in suspension state, consisting of compensative tank with air pump of pre-treated water, activation tank with air pump of sludge removing, settling tank with the outlet of treated water, sludge tank, and sand filter, characterized in that the compensative tank (1) is provided with air supplying equipment (12), connected with the system of air supplying of the compensative tank (33), float breaker of minimal water level (10) and float switch of working level of working level (11), when the activation tank (2) is provided with air pump of sludge removing (15) and supplying equipment (13), connected on the air supplying system of activation tank (32), which is connected to air supplying through three-way electric valve (30) and/or through independent straightway electric valve. 13. Activation treating unit, according to claim 12, characterized in that the air supplying system of compensative tank (33) consists of air supplying equipment of compensative tank (12), air supplying to the pump of sludge removing (15), air supplying to the equipment purging the settling tank (19), air supplying to the air pump of purge removing of the sand filter (34), air supplying to the air pump of floating sewage of the settling tank (16) and to the air sprayer. 14. Activation treating unit, according to claim 12, characterized in that the air supplying system of activation tank (32) consists of air supplying equipment of activation tank (13), equipment for supplying air of sludge tank (20), air supplying to air pump of crude water (7) and air supplying to the air pump of settling tank (14). 15. Activation treating unit, according to claim 12, characterized in that the system of air supplying of treating unit consists of compressor (29) three-way electric valve (30) and/or 2 straightway electric valves/for switching over the air purging system of activation tank (33) depending on the water level in compensative and/or timer switch. 16. Activation treating unit, according to claim 12 or 15, characterized in that the system of air supplying of the unit consists of 2 independent compressors, system of air supplying of compensative tank (33) and the system of air supplying of activation tank. 17. Activation treating unit, according to claim 12 or 15, characterized in that on the water level decreased for a level of float switch of minimal surface (9), the purging system of compensative tank (33) is switched on till the time, required for obtaining of working surface, which is signaled by float breaker of working surface (10), wherein the system of air supplying to the activation tank is not still activated. 18. Activation treating unit, according to claim 12 or 15, characterized in that the air supplying system of activation tank (32) is activated on the time, required for decreasing of the surface level in compensative tank (1) from the water level, signaled by floating switch of working surface (10) and/or level higher on water level, signaled by floating switch of minimal surface level (9). 19. Activation treating unit, according to claim 12 or 13, characterized in that the inlet of air pump of sludge removing (15) is located on such height over the bottom of the activation tank (2), that is required for maintaining the optimal layer of activated sludge, settled at the bottom of activation tank (2) while the air supplying system of compensative tank is working. 20. Activation treating unit, according to claim 12 or 18, characterized in that polluted water of flushing of the sand filter (22) in time of air supplying to compensative tank (1) is pumped by air pump of sludge removing of the sand filter (34) in compensative tank.