Method and apparatus for treating emulsified oil waste water

Abstract

The invention discloses a emulsified oil waste water processing method, comprises five steps such as separating oil and emulsion breaking, adding easy degrading material, deoiling by codegradation membrane biological method and mud processing, the invention combines codegradation mechanism with the application of a membrane bioreactor based on biological treatment of oily wastewater, has strengthened ability of biological processing oil contamination, has broken through the inhibition of oil for microorganism. The invention also discloses a emulsified oil waste water processing device, comprises a separating equalizing tank, a emulsion breaking tank, a middle tank and a membrane biological reaction tank connected successively, the produced mud is sent in a mud storing tank, a hydroextractor successively, a demulsifier feeding apparatus is arranged out of the emulsion breaking tank, a nutrient salt feeding apparatus is arranged out of the middle tank. The device requires widely for influent oil concentration of the bioreactor, COD concentration, has strong degradation ability to contaminant, processed effluent can reach the standard, produces a little mud and a little secondary pollution, has simple device technological process and saves investment and operating costs.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and relates to a biological treatment method and treatment equipment for oily wastewater, especially high-concentration emulsified oily wastewater. Background technique [0002] Emulsified oily wastewater is one of the more difficult types of oily wastewater, and its main components are engine oil or mineralized oil, emulsifier, lubricating preservative and water. The emulsified oil in the wastewater is very stable, not easy to destroy, and difficult to handle, because the wastewater contains surfactants to make the oil a stable emulsion, the particle size of the oil droplets is extremely small, and a layer of boundary film is formed on the surface, with With charge, an electric double layer is formed on the periphery of the oil droplets, which makes the oil droplets repel each other and is extremely difficult to approach, and has a certain stability in dynamics, so it is difficult to handle. ...

AI Technical Summary

Problems solved by technology

[0003] (1) The chemical method and physical method can only achieve the degreasing effect, and the treatment degree is not high enough. The treated water still contains high organic pollutants, and the COD concentration cannot meet the discharge standard. A method, multi-stage series connection, resulting in long process, complex processing technology and other problems

[0004] (2) The treatment of high-concentration emulsified oil wastewater often needs to continue to use activated carbon adsorption, ultrafiltration and other tertiary treatment technologies to strengthen the treatment effect after demulsification and air flotation, but the operating costs of these physical and chemical methods are relatively high

The filter membrane is often made into a hollow fiber tube filter to increase the filtration area of ​​the membrane, but the filter is easy to clog, the membrane is difficult to clean, the operation cost is high, and the infrastructure and operation costs are high

And the concentrated solution after filtration still needs to be treated, usually by incineration method, the cost is too high, and it will cause secondary pollution to the environment

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