PLANT FOR CLEANING OIL-CONTAINING AND WASTE WATER Russian patent published in 2016 - IPC C02F9/02 C02F1/24 C02F1/40 C02F1/20 C02F1/74 B01D17/35 B03D1/14 B01F3/04 B01D19/00 

FIELD: treatment plants.

SUBSTANCE: invention relates to water treatment systems and can be used for cleaning oil-containing and waste water. Plant for cleaning oil-containing and waste water comprises at least two cleaning stages, connected in series along flow of purified water and separated from each other by means of partition walls 7. Each cleaning stage consists of a flotation reactor 1, 2, 3 and floatation separator 4, 5, 6 separated by partition 8. Aeration unit 10 of first stage is communicated via pump 9 with bottom part of floatation separator 6 of last purification stage. Output of purified water feed pipeline 11 is connected with bottom part 16 of floatation reactor 1 of first purification stage. First output of aeration unit 10 is connected through throttling valve 26 with input of floatation reactor 1 of first purification stage. Second and subsequent purification stages are equipped with deaeration units 31, 32. Output of each of deaeration units 31, 32 is located in bottom 33, 34 and communicated via throttle valve 26 to input of corresponding floatation reactor 2, 3 and, via pressure regulator 35 with input of upper part of dearation unit 36, 37 of next purification stage. Second output of aeration unit 10 is connected through pressure regulator 35 to input of upper part 36 of dearation unit of second purification stage. Output of each throttling valve 26 is arranged at input of corresponding floatation reactor 1, 2, 3. Cross-sectional area of bottom of each floatation reactor 1, 2, 3 uniformly decreases in direction from top to bottom. Cross-sectional area of floatation reactor 4, 5, 6 is not less than cross-sectional area of corresponding floatation reactor. Partitions 8, separating floatation reactors 1, 2, 3 from floatation separators 4, 5, 6 are configured for free movement of purified water flow in upper parts of floatation reactors 1, 2, 3 and floatation separators 4, 5, 6 of one purification stage. Partitions 7, separating purification stage, are configured for free flow of purified water in bottom parts of floatation separators 4, 5, 6 and floatation reactors 1, 2, 3 of various purification stages. Aeration unit 10 is designed to maintain saturation pressure is 0.3-0.6 MPa. Deaeration units 31, 32 can maintain saturation pressure of 0.1-0.3 MPa.

EFFECT: invention increases efficiency of cleaning oil-containing and waste water.

7 cl, 1 dwg