A recycling process for waste emulsion

Abstract

The invention discloses a recycling treatment process of waste emulsion, which is processed according to the following procedures: (1) coarse filtration → (2) separation of organic phase → (3) first-stage purification → (4) second-stage purification → ( 5) The third stage of purification → (6) evaporation → (7) biochemical treatment. The inventive use of the present invention removes and processes step by step step by step, and each segment must adapt to the limited requirements of its disposal. In this way, the step-by-step processing and disposal can adapt to the rationality requirements from high to low, and the treatment and disposal are highly targeted. Disposal meets the national standard discharge requirements. The cost input is slightly larger than the former, mainly in the front-end separation and chemical treatment, but the treatment and disposal effect is very good, and the overall investment is much lower than other treatment process costs.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a process for recycling waste emulsion. Background technique [0002] For the environmental protection disposal industry, the emulsion has a large number of sources, and it actually involves a wide range of industries. In addition, each waste production unit does not strictly control it, which makes the emulsion itself very complicated. And to make matters worse, so for the environmental protection treatment and disposal industry, the difficulty is self-evident, mainly in these aspects, the category of hazardous waste emulsion is HW09, mainly containing oil / water, hydrocarbon / water mixture or emulsion However, in the actual classification, differentiation and transportation, there will be organic solvents, organic matter, mineral oil, developer, paints, surfactants, etc. mixed with each other. Severe technical problems. The output of this kind of emulsion is large...

AI Technical Summary

Problems solved by technology

[0008] At present, most disposal companies basically use multi-effect evaporation facilities to concentrate and evaporate the emulsion. In this case, the mixed components of this type of emulsion are complicated, and they have good solubility in the solution. Some boiling points are similar to those of water, and some are Low boiling point substances, so when evaporating, more pollutants will be evaporated together, and some azeotropes will also be brought out together. From the surface, the evaporated condensed water is relatively transparent, but in fact it is The COD, ammonia nitrogen and most of the second-class pollutants are quite high, some of them are pyrolyzed at high temperature, the smell is particularly strong, and the toxicity is also very high, and the content is quite high (COD is at least 50000-180000 mg / l, ammonia nitrogen is still above 10000, the second class Most of the toxic components contained in the pollutants 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 because the biological bacteria will gradually die and lose the treatment and disposal capacity. Fenton treatment first is not enough, because Fenton treatment has limitations, high content of COD, ammonia nitrogen and some second-class pollutants, (the more complex mixed organic substances are its COD, ammonia nitrogen and some second-class pollution The main reason for the high material content) cannot effectively reduce the treatment, so this kind of method is not advisable. Although the cost investment is not large, the process path is not feasible, and the emission cannot meet the standard

The main reason is that it is not ideal for complex emulsions to distill water. At the same time, the Fenton method has a range and certain limitations for high COD and high ammonia nitrogen, especially for unclear mixed organic wastewater, and the treatment effect is very unsatisfactory.

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