Project Overview

A food manufacturing enterprise generates a large volume of food processing wastewater during production. The project is designed with a daily treatment capacity of 500 m³ of food wastewater. The raw wastewater exhibits typical characteristics of food wastewater, including high organic content, high suspended solids, and animal and vegetable oils.

Influent water quality:

- COD: 2200–2800 mg/L

- BOD₅: 1100–1500 mg/L

- SS: 700–900 mg/L

- Animal and vegetable oils: 180–260 mg/L

The project strictly implements the Grade I standard of the Integrated Wastewater Discharge Standard (GB 8978-1996). Effluent quality meets discharge standards consistently and satisfies environmental supervision requirements.

Process Flow & Core Equipment

This project adopts a specialized treatment process for food wastewater:

Grid Pretreatment → Oil Separation & Sedimentation → Dissolved Air Flotation → Hydrolysis Acidification → A²/O-MBBR Biochemical Treatment → Deep Sedimentation → Disinfection

Core Equipment Models & Configurations

1. Rotary fine grid, 5 mm grid gap

2. Horizontal flow oil separation sedimentation tank

3. DAF-35 dissolved air flotation unit, treatment capacity 35 m³/h

4. Equalization tank equipped with submersible mixers and online pH monitoring system

5. Hydrolysis acidification tank + HRT high-efficiency biochemical system

6. A²/O-MBBR integrated wastewater treatment equipment with dedicated biological carriers

7. High-efficiency inclined tube sedimentation tank with automatic PAC & PAM dosing system

8. Terminal disinfection system

Treatment Performance & Operational Data

After commissioning, the food wastewater treatment system achieves stable and excellent performance:

- Effluent COD: 45–58 mg/L

- Effluent SS: 15–19 mg/L

- Animal and vegetable oils: 6–9 mg/L

- Overall COD removal rate ≥ 98%

- SS removal rate ≥ 98%

- Oil removal rate ≥ 96%

The complete food wastewater treatment system operates stably, features strong resistance to water quality fluctuations, and maintains long-term, continuous compliance. It meets environmental inspection, online monitoring, and data traceability requirements.

Project Advantages

- Customized process tailored to the high organic and high oil characteristics of food processing wastewater

- MBBR integrated wastewater treatment equipment features small footprint, simple operation and maintenance, and low operating cost

- Full-process automatic control, stable effluent quality, complete qualifications, and authentic, verifiable data

- Complies with national environmental discharge standards and smoothly passes environmental acceptance and routine supervision