Food Industry Wastewater Introduction
The content of the food industry is extremely complex, including Sugar Making, Brewing, Meat processing , Dairy processing, and other production processes. The wastewater discharged contains organic substances, has a strong oxygen consumption, and a large amount of suspended solids are discharged with the wastewater.
The waste water discharged from animal food processing also contains animal excreta, blood, fur, oil, etc., and may contain bacteria. Therefore, the oxygen consumption is very high, which is much more polluting than the waste water discharged from plant food processing.
Wastewater Characteristic
- Solid substances floating in wastewater, such as vegetable leaves, fruit peels, shredded meat, bird feathers, etc
- The substances suspended in wastewater include oil, protein, starch, colloidal substances, etc
- Acids, bases, salts, sugars, etc. dissolved in wastewater
- Sand and other organic matters entrained by raw materials
- Lethal bacteria, etc
The common characteristics of food industry wastewater are high content of organic substances and suspended solids, easy to decay, and generally no significant toxicity. The main hazard is to eutrophic the water body, causing the death of aquatic animals and fish, causing odor from organic matter deposited at the bottom of the water, worsening water quality, and polluting the environment.
Treatment Methods
In addition to properly treating wastewater from the food industry according to the characteristics of water quality, biological treatment is generally recommended. If there is a high requirement for the quality of the effluent or due to the high content of organic matter in the wastewater, a two-stage aeration tank or two-stage biological filter, or a multi-stage biological rotary table, or a combination of two biological treatment devices, or an anaerobic aerobic series biological treatment system can be used.
The sludge produced by the food industry has high organic content, high viscosity, and high oil content, making it difficult to treat. If a traditional plate and frame filter press or belt filter press is selected, it is not only easy to form mud cakes, but also easy to block the filter cloth, requiring timely cleaning, which is inefficient, and labor costs are high.
QDEVU Screw Press Sludge Dewatering Machine integrates thickening and dehydration, reducing investment in sludge thickening tanks and reducing floor space.
During long-term sewage treatment, the plate and frame dehydrator is prone to clogging due to accumulation of impurities. The QDEVU screw press sludge dewatering machine adopts a self-cleaning function, which can avoid accumulation of impurities during sewage treatment and make the equipment operate more smoothly. The self cleaning function can be used to maintain stable operation of the equipment, which is also one of the important application advantages of the laminated screw equipment.
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