Solutions for wastewater treatment in food processing plants
Wastewater treatment in food processing plants is PCB wastewater, which is a type of wastewater in the food industry. Food processing plant wastewater treatment is divided into: cleaning wastewater, ink wastewater, concentrated acid waste liquid, concentrated alkali waste liquid, etc. The amount of food wastewater is large, the pollutants of the wastewater are many kinds, and the composition is complex. Wastewater treatment in food processing plants is to enrich the pollutants in the wastewater or to separate easily separated objects from the wastewater, so that the wastewater can meet the discharge standards. Today AzumaDr. will introduce to you what are the solutions for wastewater treatment in food processing plants.
1. Decantation method
The decantation method is actually a filtration method, which is one of the physical methods in the wastewater treatment methods of the food industry. The flushing water containing copper scraps discharged from the deburring machine can be filtered to remove copper scraps after being treated by a decanter. The effluent filtered by the decanter can be reused as the cleaning water of the burr machine.
2. Chemical Law
Chemical methods include oxidation-reduction methods and chemical precipitation methods. The oxidation-reduction method uses an oxidizing agent or a reducing agent to convert harmful substances into harmless substances or substances that are easy to precipitate and precipitate. The chemical precipitation method uses one or several chemical agents to convert harmful substances into easily separated sediments or precipitates. There are many kinds of chemical agents used in PCBAOEM OEM substitute circuit board wastewater treatment. The precipitant can convert heavy metal ions into precipitates, and then pass through the inclined plate sedimentation tank, sand filter, PE filter, filter press, etc. to make the solid liquid Separate.
3. Chemical precipitation-ion exchange method
Chemical precipitation treatment of high-concentration wastewater is difficult to meet the discharge standard in one step, and it is often used in combination with ion exchange. First, use chemical precipitation to treat high-concentration circuit board wastewater to reduce the content of heavy metal ions to about 5 mg/L, and then use ion exchange to reduce heavy metal ions to discharge standards.
4. Electrolysis-ion exchange method
Among the wastewater treatment methods of food processing plants, the electrolysis method to treat high-concentration circuit board wastewater can reduce the content of heavy metal ions, and its purpose is the same as the chemical precipitation method. However, the disadvantages of the electrolysis method are: only effective for the treatment of high-concentration heavy metal ions, the concentration is reduced, the current is significantly reduced, and the efficiency is significantly weakened; the power consumption is large, and it is difficult to promote; the electrolysis method can only process a single metal. Electrolysis-ion exchange method is copper plating, etching waste liquid, for other waste water, but also use other methods to deal with.
5. Chemical method-membrane filtration method
Wastewater in the food industry is chemically pretreated to precipitate filterable particles (0.1μ in diameter) from harmful substances, and then filtered through a membrane filter device to meet the emission standards.