Deoiling method for cold rolling oil-rich emulsion wastewater, and device thereof

Abstract

The invention relates to a deoiling method for cold rolling oil-rich emulsion wastewater, and a device thereof. The method comprises the following steps: 1, filtering pretreatment; 2, oil-water separation; and 3, waste oil recycling. An oil-water separator comprises an oil-water rectifier, a porous filled area and a multilayer folded plate oil-water separation area, the porous filled area and themultilayer folded plate oil-water separation area are filled with functional nano-fiber filter cores, and every functional nano-fiber filter core is a 304 stainless steel wire fiber and modified polypropylene fiber hybrid fabric filter layer, wherein the denier (fiber diameter) of each of the 304 stainless steel wire fiber and the modified polypropylene fiber is 50-500 nm. The method and the device thereof have the advantages of good treatment effect, low running cost, no secondary pollution, and realization of waste oil recovery.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and a device for removing oil from cold-rolled thick oil-containing emulsion wastewater. The oil removal treatment method and its device have good treatment effect, low operation cost, no secondary pollution, and can realize waste oil recovery. Background technique [0002] Heavy oily wastewater from cold rolling has serious problems of deteriorating water quality, endangering human health, polluting the environment, and affecting natural landscapes. All countries in the world have made regulations and restrictions on the concentration of oily wastewater discharged. my country stipulates that the maximum allowable mass concentration of oily wastewater is 10mg / L, while the latest emission target for rolling mills is less than 1mg / L. [0003] The oil-containing emulsion wastewater from cold rolling mainly comes from the cold rolling mill unit, the roll...

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Problems solved by technology

[0008] However, as mentioned above, there are still many deficiencies in the above 2 methods: for example, secondary pollution, and the separated oil is often not recyclable, and the quality of the treated effluent is also unstable, and it is difficult to meet the discharge standard

Moreover, after a certain period of operation, the ultrafiltration degreasing equipment needs to use concentrated alkali for backwashing, which will generate high-concentration alkaline wastewater, which will put pressure on wastewater treatment; backwashing will reduce the separation efficiency of the device and shorten the service life

Therefore, the traditional separation method has many deficiencies in the treatment of oily wastewater from steel rolling emulsion.

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