Oil sewage treatment system

[0015] The present invention will be further described below. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0016] Such as figure 1 As shown, the oily sewage treatment system of the present invention is provided with a mechanical grille at the entrance of the regulating tank 1, which is used to remove suspended solids such as plastic bags and cloth strips), and the regulating tank 1 is used to regulate water quality and volume. A slick oil collector is arranged in the tank 1 to collect the slick oil on the liquid surface. The sewage in the regulating tank 1 is lifted to the cyclone deoiler 2 by the lift pump 13, so that the oil and water are naturally separated under the action of centrifugal force. The separated oily substances are discharged to the oil collecting tank 15, and the remaining sewage is discharged to the gas Floating device 3, in the process of entering the air flotation device, drives the dosing device 14 to automatically dosing. After the dosing reaction, the sewage enters the contact chamber of the air flotation device 3, so that the oil and suspended matter can be adsorbed by the micro bubbles The remaining sewage enters the water tank 4 and the sewage in the water tank 4 is pressurized to the oil-water separator 5 through the lift pump 13. The oil-water separator 5 is provided with a filter element, which is made of hydrophilic and oil-repellent material, which can filter out oily substances above 10 microns, and the sewage filtered by the filter element enters the activated carbon filter 6. The activated carbon filter 6 can intercept suspended solids and oily substances in the water to further improve the water quality. The sewage filtered by activated carbon enters the precision filter 7. The filter element is made of hydrophilic and oil-repellent material with a filtration accuracy of 5 microns. After two-stage filtration, the oily substances in the sewage basically reach the standard, and then the conventional sewage treatment starts. After passing through the precision filter 7, the sewage enters the secondary water tank 8, and the secondary water tank 8 is provided with a lifting pump 13, and the lifting pump 13 sends the water in the secondary water tank to the anoxic tank 9. The sewage in the anoxic tank 9 produces biogas during the anaerobic nitrification process and fully degrades organic pollutants. The remaining difficult-to-degrade organic pollutants in the sewage enter the membrane biological reactor 10 with the sewage. The phosphorus-accumulating bacteria in the anoxic tank 9 adsorb a large amount of organic matter in the sewage under anaerobic conditions, and release phosphorus at the same time, creating conditions for the subsequent aerobic stage to absorb a large amount of phosphorus. The bottom of the anoxic tank 9 is also provided with a stirrer, which stirs the organic pollutants. The stirring by the stirrer can not only enhance the activity of organic pollutants, but also avoid the deposition of organic pollutants on the bottom of the anoxic pool, which may cause pollution. The difficulty in sludge discharge affects the efficiency of anaerobic biological nitrification of sewage in the anoxic tank. The anoxic tank 9 communicates with the upper part of the membrane biological reaction tank 10, so that the sewage in the anoxic tank 9 can flow into the membrane biological reaction tank 10 freely. The organic matter in the sewage is oxidized and decomposed in the membrane biological reaction tank. At the same time, the phosphorus-accumulating bacteria ingest more phosphorus in the sewage than it releases under anaerobic conditions. In this way, the membrane biological reaction tank discharges high-phosphorus surplus sludge. Phosphorus is removed. The membrane bioreactor 10 is equipped with a filter membrane, and organic pollutants are separated by high-efficiency solid-liquid separation through the filter membrane to meet the emission standard. The water treated by the membrane bioreactor 10 can meet the discharge standard after testing. The membrane biological reaction tank 10 and the clean water tank 11 are connected by a self-priming pump 12, and the treated water is sent into the clean water tank.

[0017] Furthermore, perforated aeration is used at the bottom of the regulating tank to perform agitation and homogenize the water quality.

[0018] Further, a sludge discharge pipe is provided at the bottom of the anoxic tank, and the sewage is degraded by anaerobic nitrification in the anoxic tank to generate organic pollutants. The sludge discharge pipe is used to discharge organic pollutants on a regular basis to avoid deposits at the bottom of the anoxic tank.

[0019] Further, the membrane biological reaction tank is also equipped with a blower, which can also play a role in flushing the activated sludge adsorbed on the filter membrane while adding oxygen to the membrane biological reaction tank.