FIELD: waste water treatment.
SUBSTANCE: invention relates to apparatuses for deep biological purification of household waste waters with active sludge in suspended state, which apparatuses would be suitable for use both in separately situated cottages, farm-adjoining houses and in hotel complexes, schools, sport clubs, settlements, public catering establishments, etc. Waste water treatment comprises two operation phases of apparatus. Waste water is fed to compensative tank with activated sludge, wherefrom it flows through slot filter into first compensative air tank, then, through aerated biofilter, into second compensative air tank, and finally overflows into bottom zone of air tank-settler. First phase includes: aeration of the first and second compensative air tanks and pumping-out with main pump of preliminarily settled treated water from tube well of the air tank-settler into bottom zone of secondary settler; aeration of tube well; automatic stopping of main pump; overflow of displaced treated water from upper layers of secondary settler into chamber with porous filter and then into pump chamber; periodic pumping-out from pump chamber with the aid of drainage pump provided with float level sensor and withdrawal of completely purified water beyond the plant; pumping of sludge by sludge pump from bottom zone of air tank-settler into sludge stabilization chamber and overflow of displaced water with sludge from sludge stabilization chamber into compensative tank. All this process is accompanied by constant circulation motion of water being treated and sludge through all vessels by means of circulation channels. After timer signal, plant is switched over to its second operation phase. Feeding of air into aerators of compensative tank and air tank-settler is effected. Further, water is pumped out consecutively with biological film from secondary settler mirror and then with settled activated sludge from bottom zone of secondary settler. Activated sludge from air tank-settler is pumped into compensative tank. Are turned on: coarse-bubble aerators-mixers in sludge stabilization chamber, porous filter regeneration aerator in porous-filter chamber, and pump pumping out filtrate formed therein into sludge stabilization chamber. Periodically, pulsing turning-on of the first and second compensative air tanks is performed. After that, following signal of timer, apparatus is switched over back into first operation phase.
EFFECT: achieved production of high-quality purified waste waters suitable for reuse, reduced power consumption, increased operation reliability, and reduced labor-intensiveness.
5 cl, 1 dwg, 1 tbl
