Novel recycling treatment method of emulsified liquid

Abstract

The invention relates to a novel recycling treatment method of emulsified liquid, which comprises the following steps of: removing an oil phase through oil-water separation, conducting filtering to remove large-particle metal impurities and suspended matter, carrying out chemical treatment to obtain filtrate, carrying out evaporation treatment on the filtrate, carrying out multi-stage sewage biochemical treatment on condensed water obtained by evaporation, and conducting discharging or recycling after reaching the standard. A filter cake and a kettle bottom substance generated in the treatment process are subjected to incineration landfill or cement kiln cooperative treatment, so that the recycling treatment method of the emulsified liquid can realize maximum treatment of the emulsified liquid waste, and through step-by-step and segmented removal and treatment, the treatment pertinence is strong, and the treated emulsified liquid waste can reach the international emission standard. The method is simple and convenient in operation process, high in safety and capable of realizing industrial production.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment, and in particular relates to a new method for resourceful disposal of emulsion. Background technique [0002] Containing emulsified waste liquid is widely used in the mechanical processing industry. It has the functions of cooling, lubricating, cleaning and rust prevention. It is a high-concentration, refractory industrial waste liquid with high emulsification degree and complex chemical composition. At present, the treatment methods for oily emulsified waste liquid include heating, flocculation and sedimentation, aeration and air flotation, membrane separation and other methods. However, these methods have problems such as high process requirements, unstable effluent quality, high disposal costs, and large sludge production. [0003] Emulsion plays a very important role in the development of industrialization in our country today, and even in the development of industrializati...

AI Technical Summary

Problems solved by technology

It is mainly manifested in these aspects. The category of hazardous waste emulsion is HW09, which mainly contains oil / water, hydrocarbon / water mixture or emulsion. However, in the actual classification, distinction and transportation, there will be organic solvents and organic waste liquids. Waste organic liquids such as mineral oil, developer, paint, surfactant, loosening liquid, rust remover, amine liquid and other waste organic liquids are mixed with each other. The serious complexity brings very serious technical problems to the treatment and disposal.

[0004] At present, most disposal enterprises use multi-effect evaporation facilities to concentrate and evaporate the emulsion. However, since this type of emulsion itself is composed of complex mixed components, it has good solubility in the solution. Some components have boiling points similar to water, and some are Low boiling point substances, so when evaporating, more pollutants will be evaporated together, and some azeotropes will also be taken out together, and a large amount of organic substances will be cracked and cracked into more organic substances under high temperature conditions. Toxic or more difficult-to-degrade organic matter; on the surface, the evaporated condensed water is relatively clear, but in fact its COD, ammonia nitrogen and second-class pollutants are quite high, and the smell is pungent and carcinogenic (COD is at least 50,000 -180000mg / l, ammonia nitrogen is above 10000, most of the second-class pollutants contain toxic components, which directly affect the subsequent treatment of water quality), if such water is directly entered into the biochemical sewage treatment system, the entire treatment system will be paralyzed, mainly biological All the bacteria gradually die and lose the ability to handle

Even if the Fenton treatment is carried out first, this is because the single Fenton treatment has limitations, and the COD, ammonia nitrogen and secondary pollutants with high content cannot be effectively reduced.

To sum up, in the prior art, the multi-effect evaporation process is used to treat the emulsion waste liquid. Although the cost investment is not large, the actual feasibility of the process is low, and it is difficult to meet the discharge standards.