METHOD FOR PURIFICATION OF OILY WASTEWATER IN CONVECTIVE FLOWS Russian patent published in 2023 - IPC C02F1/465 C02F1/40 

FIELD: oil industry.

SUBSTANCE: invention relates to the treatment of oily wastewater by combined methods. The method includes two purification stages connected in series along the flow of purified water and separated from each other. One stage consists of a flotation reactor and a flotation separator separated by a baffle, an aerating unit, a purified water supply pipeline and a purified water discharge pipeline. The output of the treated water supply pipeline is connected to the bottom part of the flotation reactor. The outlet of the aerating unit is connected through a throttling valve with the inlet to the flotation reactor located at the lower point of its bottom. The straight partition is configured for free movement of the purified water flow in the upper part of the flotation reactor and the flotation separator of one purification stage. The aerating unit is configured to maintain saturation pressure. The complex additionally comprises a flotation foam receiver equipped with a branch pipe for its removal. Treatment of purified water by electroflotation is carried out in convective flows created by gas bubbles obtained by electrolysis at the second stage of purification after preliminary treatment in a hydrocyclone with the separation of coarse fractions of impurities in the purified water. Processing in the flotation reactor is carried out by saturation with finely dispersed air bubbles, starting from the bottom point of the bottom of the flotation reactor with the concentration of the oil fraction near the surface of vertically oriented anodes and the discrete movement of enlarged accumulations in ascending convective flows, periodically turning into local vortexes upon contact with the surface of horizontally oriented cathodes. The cathodes are made in the form of rigidly twisted helical elements. Separation of treated water and oil fractions is carried out in the upper part of the flotation reactor by forming vortex flows with rigidly twisted spiral elements of the surface of horizontally oriented cathodes and sequential removal of flotation foam through a flotation separator with a straight partition and an arc-shaped partition to separate flows, through the upper drain into the flotation foam receiver , and the purified fraction water through the lower drain pipe into the outlet pipeline.

EFFECT: increased efficiency of oil and water separation.

1 cl, 2 dwg