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

• Main Authors: ZHANG HONGYAN, NIU JINTAO, NIU QINGZHONG
• Format: Patent
• Language: English
• Published: 25.11.2015
• Subjects: DISPOSAL OF SOLID WASTE; PERFORMING OPERATIONS; RECLAMATION OF CONTAMINED SOIL SOIL; TRANSPORTING

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.