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Naphthenic acid wastewater recycling

by:Deyuan      2020-08-10
With the continuous development of domestic oil refining industry, the relevant refineries to produce a large number of naphthenic acid and mixed alkaline wastewater. This kind of wastewater treatment is difficult, causing serious pollution to the environment. According to relevant data show that at present domestic only a few refiners to take simple pretreatment measures, most of the oil refinery directly discharged into environment without processing. Therefore, for naphthenic acid and mixed alkaline wastewater treatment, is the main problem of domestic oil refinery wastewater treatment.

high concentration of COD in waste water of naphthenic acid, biochemical, often used in the process of heating oil removing method, chemical oxidation, wet oxidation, activated carbon adsorption method, solvent extraction, etc. Through a lot of experimental data, the method of solvent extraction method of naphthenic acid wastewater treatment is better than other processes.

using solvent extraction naphthenic acid wastewater treatment, raw water with sulfuric acid acidification first, and then the naphthenic acid waste water and extracting agent according to certain proportion in the centrifugal extraction machine, with the aid of the rotation of the drum, through the turbine disc and the impeller to make two phase mixing and dispersing quickly, two phase solution fully mass transfer, mixing and mass transfer process. Mixture again after the effect of drum centrifugal force through two separate out of the body side by side. Extraction phase into the sewage farm for biochemical treatment, extraction phase with alkali extraction, the extraction solvent recycle.

naphthenic acid waste water processing flow chart:

after solvent extraction of naphthenic acid wastewater concluded that untreated naphthenic acid wastewater biological sex is very poor, COD concentration is high, such as directly discharged into the sewage field can't be effective biochemical treatment; And after dealing with the solvent extraction, COD concentration decreased obviously, improved the biochemical, into the sewage field can be normal after biochemical treatment.

related extraction equipment figure:

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