Treatment method for oil residue generated during sewage treatment process for dairy products

Abstract

The invention discloses a treatment method for oil residue generated during a sewage treatment process for dairy products, and belongs to the field of treatment for waste animal oil residue and fats generated during a sewage treatment process. The treatment method comprises the steps of pre-treatment, liquefying, fermentation and precipitation, wherein during the pre-treatment, the oil residue is mechanically stirred and adequately homogenized, and is subjected to a heating treatment for temperature control if the temperature is continuously lower than 10 DEG C for over 24 hours; after the pre-treatment, the oil residue is liquefied through special strains to be converted to sewage which is liquid-state and is mutually soluble with water from a solid state, so as to reduce a COD; the oil residue liquefied into the sewage is fed into a fermentation pool for fermentative degradation to reduce COD pollutants, thus reducing a load on a sewage treatment system, a supernatant after precipitation enters the sewage treatment system, and the precipitated sludge flows back to an oil residue heater or directly enters an oil residue liquefier for strain supplementation. According to the invention, an on-site biological treatment technology is adopted, and the oil residue directly enters the sewage treatment system to be degraded and treated after being treated in the system, thus realizing in-plant digestion of the pollutants.

Description

technical field [0001] The invention relates to the field of animal oil residue treatment, in particular to a treatment method for waste oil residue generated in the process of dairy sewage treatment. Background technique [0002] The content related to oil residue treatment technology mainly focuses on kitchen waste oil residue. The treatment of this type of oil residue mainly includes simple heating, refining, recycling and biodiesel production. [0003] However, it is difficult to treat the oil residue contained in the wastewater discharged by dairy enterprises, especially the oil residue separated from the sewage. On the one hand, the oil residue separated from the sewage, compared with the oil in the general kitchen industry, has a relatively complex composition and contains sludge, suspended solids, etc., which is not completely suitable for the production of biodiesel; on the other hand, due to The COD concentration of oil residue is usually very high, generally 28~3...

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Problems solved by technology

[0003] However, it is difficult to treat the oil residue contained in the wastewater discharged by dairy enterprises, especially the oil residue separated from the sewage.

On the one hand, the oil residue separated from the sewage, compared with the oil in the general kitchen industry, has a relatively complex composition and contains sludge, suspended solids, etc., which is not completely suitable for the production of biodiesel; on the other hand, due to The COD concentration of oil residue is usually very high, generally 28~30×10 4 mg / l, substances of this concentration cannot be absorbed by general sewage treatment systems

In the third aspect, dairy production plants are generally located in relatively remote parks, and there is no biodiesel production base nearby. Moreover, since the output of oil residue is relatively small, if long-distance transportation is used, the transportation cost is high, and the overall cost is higher than the income.

[0004] At present, the usual treatment method for this part of the oil residue produced in dairy enterprises is to compress it together with the sludge in the sewage plant, dehydrate it, and then transport it abroad. Generally, further sludge treatment, such as landfill, is required. Higher transportation costs and sludge disposal costs

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