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Food Industry Wastewater Treatment System

What is food industry wastewater?

  • Food waste is a liquid waste stream arising from food processing, pretreatment and preservation activities at food production facilities such as aquatic processing plants, cattle slaughterhouses, meat processing plants, collective kitchens, restaurants, hotels…
  • The composition of food wastewater is diverse, including biodegradable organic substances such as proteins, fats, inorganic substances such as mineral salts, pathogenic microorganisms, cleaning and disinfection chemicals…
  • Food wastewater flow depends on the scale, operating capacity of each facility. Can range from several tens to several hundred cubic meters per day.

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Harmful ingredients in food industry wastewater

  • Organic matter such as protein, carbohydrate, grease have high concentration (about 1000 – 3000 mg / L BOD), reduce the amount of dissolved oxygen in water, causing eutrophication phenomenon.
  • Suspended solids such as plant carcasses, animals, waste residues, dirt…high content. Causing pipeline blockage and deposition phenomenon.
  • Pathogenic microorganisms such as salmonella bacteria, shigella, viruses that cause diarrhea… in large quantities.
  • Residue of antibiotics in the process of breeding and processing. Toxic to aquatic organisms.
  • Heavy metals like cadmium, lead, mercury… It’s toxic to the environment and humans.

Food industry wastewater treatment technology

  • Mechanical processing: Use filter plate, filter membrane, grease trough to remove suspended solids.
  • Chemical treatment: Oxidation by chlorine, ozone, UV light to remove pathogenic microorganisms. Adjust pH. Precipitation and flocculation of organic matter, heavy metals.
  • Biological treatment: Using aerobic, anaerobic bacterial strains to decompose organic matter.
  • Sludge treatment: Anaerobic decomposition, drying, combustion, composting as fertilizer…for waste sludge treatment.

What does the food industry wastewater treatment system consist of?

  • Storage tank and original air conditioner: Temporary sewage retention, flow conditioning.
  • Mechanical filtration system: Filter plate, filter membrane remove solids. Grease shield remove grease.
  • Air conditioning tank and activated sludge: Adjust parameters such as pH, organic matter concentration.
  • Anaerobic decomposition tank: Biological treatment of organic matter by anaerobic bacteria.
  • Sedimentation tank: Scouring sludge generated from the treatment process.
  • Disinfection tanks: Use chlorine or UV light to kill bacteria.
  • Exhaust gas treatment system: Treatment of odors by adsorption and combustion methods…
  • End filtration tank: Thoroughly processed before discharging into the environment.

Advantages and limitations of food industry wastewater treatment systems

Advantages:
  • Thorough treatment of contaminants in food wastewater
  • Allow re-use of water after treatment for irrigation and cooling purposes…
  • Energy recovery from biogas and sludge
  • Reduce the load on the municipal centralized wastewater treatment system
Limitations:
  • Investment and operating costs are quite large
  • High technical and operational manpower requirements
  • Potential risk of environmental pollution if not operated well
  • A large area of land is needed to build the system.

Typical food industry wastewater treatment projects:

  • VietUc wastewater treatment plant, Nghe An: capacity of 2000 m3 / day, anaerobic biological treatment technology.
  • Wastewater treatment plant Minh Phu aquatic processing plant, Hau Giang: capacity of 3000 m3 / day, SBR technology.
  • Wastewater treatment plant of CP meat processing plant, Long An: Capacity of 5000 m3 / day, MBR technology.
  • Saigon Beer wastewater treatment plant, Binh Duong: Capacity of 8000 m3 / day, aerobic biological treatment technology.

FAQ about food industry wastewater treatment systems

  • What are suitable treatment processes and technologies for wastewater from aquatic processing plants? The process includes mechanical filtration, aerobic/anaerobic biological treatment, sedimentation, sterilization. Suitable technologies are SBR, MBR.
  • What discharge standards need to be achieved to ensure environmental safety? Standards on pH, BOD, COD, TSS, NH4 +, coliform…QCVN 40: 2011 / BTNMT.
  • What important equipment and tools are needed in the process of operating the system? Blower, pump, ozone gas, UV light, cleaning chemicals, sample analysis equipment.
  • Effective and economical measures to treat odour emissions? Using activated carbon filters, treatment with ozone, deodorization with chemicals.

Conclusion on food industry wastewater treatment system

In general, food industry wastewater treatment systems are essential to reduce environmental pollution from food production. Modern treatment technology, skilled operation team and proper investment will help the system operate stably and effectively. The widespread application of food industry wastewater treatment systems will contribute to environmental protection and sustainable development.

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