METHOD OF TREATING WASTE WATER FROM ORGANIC MATTER, NITROGEN AND PHOSPHORUS Russian patent published in 2020 - IPC C02F3/30 C02F101/16 C02F101/30 

FIELD: waste water treatment.

SUBSTANCE: invention can be used in municipal services. Wastewater treatment from organic substance, nitrogen and phosphorus using granulated activated sludge is carried out in series-cyclic reactor 1—SBR-type reactor with ascending flow of liquid, in which cyclic is repeatedly cycled, which includes sequentially implemented stages: supply of waste water, anoxic process, aerobic process, settling and draining of purified water. In reactor 1 laminar flow of waste water is supplied, supplied from reservoir 7 by means of peristaltic pump 5 through bottom of reactor 1 and settled layer of active sludge without its mixing. Fraction of waste water fed for purification from the volume of the reactor is approximately equal to the quotient of dividing nitrogen concentration of nitrates in purified water into concentration of ammonium nitrogen in incoming waste water. In one cycle water volume is supplied, which does not exceed volume occupied by settled activated sludge. Effluents are fed for at least 30 minutes, but not more than 90 minutes. In reactor 1 granulated active sludge is formed with granules of round shape without cavities with cross-section size of up to 1.6 mm, with sedimentation rate exceeding 6 m/h and sludge index less than 50 ml/g. Level of O₂ in the sludge mixture at the aerobic stage is maintained in range of 1–2.5 mg/l; sludge dose—at level of 4–6 g/l, temperature in range of 15–25 °C, pH 6.5–8. Settling is carried out for not more than 10 minutes before sewage water is supplied for purification. Drained water is drained after settling the granules and separating the sludge mixture into purified water and the sludge fraction in two ways: 1) through drain hole 11 located at level of 50 % and more of the liquid depth in reactor 1 after reducing the level of the layer of compacted granules below this opening, or 2) through drain hole 10 located in the upper part of reactor 1, by displacing the purified water with waste water supplied to reactor 1 from the bottom, after the upper liquid layer is clarified.

EFFECT: method is aimed at purification of waste water with low content of organic matter and provides high efficiency of purifying waste water at smaller areas and volumes of equipment.

6 cl, 12 dwg, 5 tbl, 2 ex