1. Characteristics of Food Processing Wastewater
1. Water Quality Characteristics
• High organic content: COD 1000-5000 mg/L
• High oil content: Animal and vegetable oils 100-500 mg/L
• High suspended solids: SS 500-2000 mg/L
• Significant water quality fluctuations: Vary by production shift and season
II. Application of Flotation Process
1. Degrease
Oil removal rate: 80-95%; effluent oil content reduced to 20-50 mg/L
2. Remove suspended solids
SS Removal Rate: 70-90%, reducing the load on subsequent biological treatment
3. Remove COD
COD removal rate: 30-50%; improves wastewater biodegradability
3. Typical Application Cases
Case 1: Wastewater treatment at a meat processing plant
Processing capacity: 300 m³/d
Influent water quality: COD 3000mg/L, oil & grease 400mg/L, SS 1000mg/L
Process Flow: Bar Screen → Equalization Tank → Air Flotation → Anaerobic → Contact Oxidation → Sedimentation
Performance: Oil removal rate 92.5%, SS removal rate 85%, COD removal rate 40%
4. Operational Management Experience
• Dosing Optimization: Identify optimal chemicals and dosages through bench-scale testing
• Sludge Treatment: Oily sludge can be recycled to extract industrial oil
• Cost Control: Total Operating Cost 1.0-2.0 CNY/m³
V. Conclusion
Dissolved air flotation (DAF) equipment offers high efficiency, stability, and cost-effectiveness for food processing wastewater treatment. Shandong Zhongnan Environmental Protection Equipment Co., Ltd. brings extensive experience in this field and provides tailored solutions to meet your specific needs.
About the Data and Author
Compiled by the Technical Department of Shandong Zhongnan Environmental Protection Equipment Co., Ltd. This content is derived from parameter records and common issues identified during equipment design, full-unit manufacturing, and on-site commissioning. It should not be used to replace field testing based on a single project conclusion.
Refer to standards including GB 18918 "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants," GB 8978 "Comprehensive Discharge Standard of Water Pollutants," GB/T 31962 "Water Quality Standard for Sewage Discharged into Urban Sewers," and HJ 2010 "Technical Specification for Membrane Bioreactor Wastewater Treatment Engineering." For specific projects, applicable standards shall be determined based on environmental impact assessment approval, discharge permits, and contractual agreements.
If you have questions about the parameters or selection methods in this article, pleaseContact UsAccompany with water quality test reports and operating conditions; we will provide explanations based on the specific project requirements.