Meat processing wastewater is an easily biodegradable, high suspended matter organic wastewater, which has a wide range of water quality and quantity. At present, the treatment of this type of wastewater is mainly treated by biological methods, including aerobic, anaerobic and facultative treatment systems. However, no matter what biological treatment process of food sewage treatment equipment is adopted, the pretreatment process must be paid full attention to, and hair removal machines, grills, oil traps, adjustment tanks or sedimentation tanks should be set up to minimize the suspension of biological treatment structures. Material and grease content to ensure proper operation of the treatment facility.

     For the processing of meat processing wastewater, the following processes are often used.

     (one) Activated sludge process

     Activated sludge method is currently a widely used and mature method in the treatment of meat processing wastewater in China. The aeration method can be shallow aeration, jet aeration, delayed aeration, oxidation ditch, etc.

     1. Shallow aeration process

     (1) Main process parameters Shallow aeration is mainly based on the principle of liquid aeration and oxygen absorption. When bubbles are formed, the oxygen transfer speed is large and the liquid oxygen absorption speed is increased. . The activated sludge process used in the treatment of meat processing wastewater in China is mainly a shallow aeration process.

     2. Jet aeration process

     The jet process increases the rate of metabolizing organic matter by activated sludge, at the same time improves the utilization rate of oxygen, accelerates the recovery of the activity of adsorbing saturated activated sludge, and promotes the removal of organic matter. Jet aeration process is used for meat processing wastewater treatment. The general process parameters are: aeration time 1h; sludge load 1.62kgBOD /; MLSS5g / L; jet pressure 1kg, water-gas ratio 0.5 ~ 1.0; BOD removal rate 95 %the above.

     3. Delayed aeration process

     The delayed aeration currently used for treating meat processing wastewater in China is mainly Carrousel aeration process. The characteristics of delayed aeration are low load, long aeration time, microbial growth in endogenous metabolic stage, and reduced sludge volume.

     4. Oxidation ditch process

     (1) Main process parameters The oxidation ditch process also belongs to the delayed aeration process, but it is different from the general delayed aeration tank in the structural form of the aeration tank. It uses a trench aeration tank.

     5.Hydro-cycle jet aeration process

     This process has no solid boundary constraints after jetting, so that waste water, sludge, and air can be freely sheared and mixed, so that sufficient oxygen is supplied and the activated sludge is maintained in a suspended state.

    (Two) SBR process

    SBR is the abbreviation of Sequential Batch Activated Sludge Process. It is an improved activated sludge process that operates in intermittent aeration mode. Its main feature is the orderly and intermittent operation in operation. Homogenization, primary sedimentation, biodegradation, secondary sedimentation and other functions in one pond, no sludge return system, so it has the advantages of simple process, small footprint, strong impact load, integration of anaerobic and aerobic microorganisms, etc. , And is suitable for food sewage treatment equipment in meat processing enterprises for more than one shift production, water quality and large fluctuations in water characteristics