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The wastewater from food processing, one of the sources of industrial wastewater, produces a certain amount of sewage and wastewater during the production process. The quality and quantity of water in these wastewater vary greatly depending on the raw materials, products and production processes, and the subsequent sewage treatment process also has A big difference, Xiao Bian today to talk about how to deal with food processing wastewater.
Food processing wastewater
The source of wastewater
The waste water from canned fruit processing mainly comes from the processes of washing, peeling, canning, sealing and sterilization, sterilization, equipment and appliance washing.
Waste water from canned vegetable processing mainly occurs in the washing and boiling processes, in which copper sulfate is sometimes added and the discharged wastewater contains copper ions.
Wastewater quality characteristics
Food processing wastewater organic and suspended solids concentration is high, rich in sugars. Vegetables, high nitrogen content in wastewater, less phosphorus content; fruit wastewater containing high phosphorus, nitrogen content less. The pH is between 5 to 10, easily biodegradable.
Wastewater discharge standards
The high content of organic matter in food processing waste water is easily biodegradable, so it can be combined with the municipal sewage pipe network. The Integrated Wastewater Discharge Standard stipulates that the sewage discharged into the urban sewer and into the secondary sewage treatment plant for biological treatment should be executed Three levels of standards for sewage discharged into urban sewers without secondary sewage treatment plants must be based on the sewer effluent receiving water body functions, respectively, the implementation of a or two standards.
Wastewater treatment technology
Food processing wastewater biodegradability, can be used anaerobic, aerobic biological treatment technology; Small canned plants, smaller emissions can be treated by coagulation sedimentation.
1, biofilm method
Commonly used to deal with this type of wastewater biofilm method has a common biological filter and high-load biological filter. Tower biological filter tower structure and lightweight high porosity filter. Wastewater pH should be 7.0 ~ 7.6, or should be adjusted before entering the filter. Biofilter for the warmer climate, cold areas should not be selected.
2, SBR method aeration tank and sedimentation tank merge into one, biochemical reactions in a pool in stages, drainage and water are intermittent, than the continuous reaction speed, high efficiency, impact resistance load capacity Strong, low sludge yield, and due to short mud, filamentous bacteria can not dominate. The operation cycle of SBR has five stages: the inflow period, the reaction period, the sedimentation period, the drainage period, the idle period, and the inflow and outflow of the SBR are all discontinuous, but the system discharges the sewage continuously, therefore, Add a reservoir, or have more than two reactors.
3, stable pond vegetables, canned fruits and seasonal processing strong, but also to use stabilized ponds, the general spring and autumn for the production season, the storage of waste water in a stable pond, after winter water to be purified, the second year and then discharged into the water .
Canned organic matter content can be treated with anaerobic pond, and the anaerobic pond should be set before the grid, the effluent also need to go through facultative ponds before they can be discharged into the water. Sewage with large sediment, the grid should also be set in front of the grid.
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