High-concentration emulsion treatment method and treatment system

Abstract

The invention discloses a high-concentration emulsion treatment method and a treatment system. The system comprises a waste emulsion storage tank, an acidification reaction tank, an oil separation tank, a Fenton reaction tank, a press filter, an evaporating pot and a biochemical device sequentially; the biochemical device comprises a filtrate collection tank, an anaerobic tank, a facultative anaerobic tank, an aerobic tank, a biological aerated filter, an MBR (Membrane Bioreactor) membrane tank, a reverse osmosis tank, a chemical oxidation pond and a recycled water tank which are sequentiallyconnected; the acidification reaction tank is connected with a dosing tank which is used for adding a demulsifier, and the Fenton reaction tank is connected with a dosing tank II for adding a Fenton reagent, a dosing tank III for adding a demulsifier and a dosing tank IV for adding liquid alkali / lime hydrate. The treatment method comprises the steps of collecting treatment, acidification, primarycoagulative precipitation, secondary coagulative precipitation, evaporation treatment, biochemical treatment and second-stage biochemical treatment. The system and the method have the effects of highdemulsification capability, applicability to the treatment of a variety of emulsions, high recovery and reutilization rate and high purification treatment capacity.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, more specifically, it relates to a high-concentration emulsion treatment method and a treatment system. Background technique [0002] In the process of mechanical processing, it is generally necessary to use emulsion for cooling, lubrication, cleaning and anti-rust treatment, which can prolong the service life of the machine and improve the processing accuracy; the emulsion mainly contains oil and surfactant, and the emulsified oil is used to water as needed It is prepared by diluting and then adding an emulsifier, which mainly comes from the degreasing process before the surface treatment process and the waste water generated by the degreasing process before the electroless copper plating, graphic electroplating, and browning / blackening of the PCB industry; the emulsion has been passed through many times After repeated use, different degrees of rancidity will occur, and the performa...

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Problems solved by technology

[0003] Commonly used waste emulsion treatment methods include: acidification method, salting-out method, membrane filtration method, chemical oxidation method, heating method, etc.; different demulsification methods have their own advantages and disadvantages, but the scope of application of demulsification methods is limited, and fixed methods It is difficult to adapt to different types of waste emulsions, and for the treatment of the same type of waste emulsions, it is often difficult to adapt to changes in water quality, and the treatment effect is unstable. The commonly used physical and chemical demulsification methods have long reaction time, poor flexibility, and need to add a large amount of Chemicals, a large amount of sludge is generated, which is likely to cause secondary pollution

[0004] The salting-out method reacts quickly and the demulsification time is short, but often a single agent cannot be demulsified, and multiple types of salt compounds are required, which increases the difficulty of screening agents; the membrane filtration method has a wide range of applications for demulsification, but the demulsification effect is not ideal. The requirements for pretreatment are very high, and there are problems such as serious membrane fouling and short membrane cleaning cycle. The above-mentioned treatment methods are only suitable for treating a certain kind of waste emulsion; but in the actual treatment process, it often includes the type of emulsion There are many, and the composition is complex, such as: emulsion wastewater, electroplating wastewater, landfill leachate, etc., using a single method cannot achieve centralized treatment, and cannot achieve a good effect of demulsification and degradation of CODcr

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