RESIDUAL OIL WASTEWATER TREATMENT PLANT Russian patent published in 2022 - IPC C02F1/40 B01D17/25 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry in the field of additional treatment of wastewater from oil fields to the required quality for the use of water in the reservoir pressure maintenance system (RPMS) of a productive oil reservoir. The invention relates to a wastewater treatment plant for residual oil having a container with the function of a water sump and a device for mixing the treated water with an organic solvent. As a tank with the function of a sump, the installation contains a vertical steel tank (VST), which has two nozzles at different heights of the tank for supplying wastewater to the tank: upper and lower, the upper nozzle is located in the upper part of the tank for supplying water through the manifold to separate the liquid and gas medium, the lower nozzle is located at half the height the upper branch pipe and serves to supply waste water through a dispersant and a manifold to the water body of the tank, the dispersant as a mixing device is connected to a pipeline to supply organic solvent to it for mixing wastewater with solvent in turbulent mode. Wastewater is supplied to the VST through one of two nozzles based on the quality of wastewater controlled at the entrance to the installation by a sampler.

EFFECT: purification of wastewater from residual oil by increasing the density difference between water and oil while ensuring moderate consumption of organic solvent, the possibility of selective use of one of the technological processes of water purification from residual oil, depending on the initial concentration of oil in the wastewater.

1 cl, 1 dwg