Treatment method of waste emulsion

Abstract

The invention relates to a treatment method of a waste emulsion. The method comprises the following steps: 1. demulsifying and precipitating; 2. carrying out MBR (membrane bioreactor) membrane bioreaction; and 3. adsorbing with activated carbon and carrying out UV (ultraviolet) disinfection. The high-efficiency demulsifier and flocculant are adopted to effectively remove oil in the waste emulsion; the oil-water separation is performed after precipitation; an anoxic tank and an aerobic region of the MBR membrane biological treatment system are utilized for biological treatment to effectively remove nitrogen and soluble organic matters in the waste emulsion; after the solid-liquid separation is performed by the MBR membrane component, the UV disinfection is performed, and the water can be directly discharged; and the treated water can be used as back flush water of the MBR membrane component or used for preparing a chemical cleaning reagent.

Description

technical field [0001] The invention relates to a treatment method of waste emulsion, in particular to a treatment method of waste emulsion produced in broaching, grinding, cutting and other processing processes. It belongs to the technical field of sewage treatment. Background technique [0002] For a long time, my country has been facing the dual pressure of water resource shortage and water pollution. Industrial wastewater is the main source of water pollution. Among them, emulsion wastewater ranks first among all kinds of industrial wastewater due to its wide distribution of sources. The sources of oily emulsified wastewater or waste emulsion are mainly steel cold rolling industry, automobile industry, machinery processing industry, petrochemical industry, printing and dyeing, food processing and other industries. Due to the emulsifier contained in the waste emulsion, it belongs to the oil-in-water emulsification system, and its main components are machine oil or minera...

AI Technical Summary

Problems solved by technology

The sedimentation method mainly separates the oil and water by adding a demulsifier to obtain the upper oil slick. The process is simple, but the treated water often cannot meet the discharge standards; the air flotation method is to introduce small air bubbles into the waste emulsion, and use the small air bubbles as a carrier. Adhering to the oil-containing substances in the waste emulsion makes the buoyancy greater than the resistance, and the oil-containing substances float on the liquid surface, thereby collecting the slick oil for recycling. However, because the waste emulsion contains surfactants, it is easy to generate a large amount of gas when small air bubbles are introduced. Foam is not conducive to the adhesion and collection of slick oil, and the air flotation equipment is generally complicated and bulky, consumes a lot of power, and the price is high; the ultrafiltration method is to achieve the purpose of oil-water separation through the filtration of small-pore membranes, but the traditional ultrafiltration Membrane processing flux is low, it is difficult to solve the problem of membrane clogging

[0004] In addition, the current waste emulsion treatment methods and devices only focus on the separation of oil and water in the waste emulsion, but do not pay much attention to the control of nitrogen content and dissolved organic matter in the effluent. With the improvement of pollutant discharge standards in my country, The treatment process and pollutant control of the corresponding waste emulsion have failed to meet the requirements

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