Grease refining wastewater treatment process

Abstract

The invention discloses a grease refining wastewater treatment process which comprises the following steps: step 1, pumping refining wastewater into an oil separation gas floating tank, adding PAM and PAC for coagulation, flocculation and precipitation, and recycling nigre; step 2, feeding the wastewater separated from the oil-gas separation floating tank into a gas floating pool, and adding PAM and PAC for coagulation, flocculation and precipitation; step 3, feeding the wastewater separated from the gas floating pool into a precipitation pool through a water tank for precipitation separation; step 4, sending the precipitated wastewater into an anaerobic pool for biological aeration; step 5, sending the wastewater treated by the anaerobic pool into an A / O pool for biochemical treatment; and step 6, carrying out precipitation separation on the wastewater from the A / O pool in a secondary precipitation tank to obtain standard water. The process has the beneficial effects that the operation is simple, the effect is obvious, the treated water quality can reach the national sewage comprehensive discharge standard, byproducts are effectively treated, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oil wastewater treatment, in particular to an oil refining wastewater treatment process. Background technique [0002] With the rapid development of my country's economy and the improvement of people's living standards, the production scale of edible vegetable oil in my country is getting larger and larger, and a large amount of waste water is produced in the production process. The waste water generally contains 2-4% oil, and also contains a small amount of acid, alkali, inorganic Salt, suspended solids, and a large amount of organic matter, such as fatty acids, etc. If these pollutants are not treated and directly enter the water body, they will not only cause the death of aquatic organisms, but also affect agricultural irrigation and drinking, causing serious environmental pollution. [0003] At present, my country's edible vegetable oil and oil processing industry is in the transition period from prim...

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Problems solved by technology

If these pollutants enter the water directly without treatment, it will not only cause the death of aquatic organisms, but also affect agricultural irrigation and drinking, causing serious environmental pollution.

[0003] At present, my country's edible vegetable oil and oil processing industry is in the transition period from primary processing to intensive processing, but the wastewater treatment of the existing process has high operating costs and low overall corporate benefits; the process wastewater in the refining workshop is mainly from the degumming centrifuge, alkali refining centrifuge Machines, washing centrifuges and other processes; Process wastewater is high-concentration organic wastewater with high oil content. The pollution sources in wastewater are emulsified oil, soluble oil, soapstock (fatty acid), and the content of suspended solids is also high; it contains a lot of Vegetable oil, protein, fatty acid and other useful substances; alkali refining wastewater is the core pollution source of edible vegetable oil processing wastewater

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