OILY WATER TREATMENT AT OIL PRODUCTS SUPPLY FACILITIES OF AGRICULTURAL ENTERPRISES
For effective cleaning of oily water use should be made of combined methods of purification, for example, a dynamic tank sump and a liquid filter. The authors suggest using a thin-plate tank-sump as a dynamic gravitational purifier. The paper contains the determined optimal design parameters of this device: the plates’ length, the shape, the angle of inclination and gap (the distance between adjacent plates). It has been found that the highest cleaning efficiency from multiphase solid particles in the dynamic tank is achieved when the plate inclination angle is 45°; the optimal size of the gap between the plates is 5 mm. Achieving the established requirements of maximum permissible content of oil in water requires the use of additional devices as such devices can be used in liquid filters - hydrocarbon lenses located on a water cushion. Their main weakness is the secondary emulsification. Reducing the intensity of the secondary emulsification is possible by a system of baffles in the bottom of the liquid filter housing. The authors have tested several variants of the devices with different arrangement of partitions and experimentally determined the most efficient design. The best results have been shown by a device with upper and lower position of the interior walls and the peripheral emulsion inlet, which has been subjected to further tests. Oily water treatment using a dynamic thin-wall lamellar settler allows removing solid contaminants with particles larger than 25 microns and separating more than 30% of mineral oil, and the use of a dynamic liquid sump filter can purify water up to the maximum permissible oil concentration.