Characteristics of Kitchen Wastewater:

1. High organic content: The organic matter concentration in the wastewater exceeds tens of thousands of milligrams per liter.

2. High moisture content: Water content can reach 80%–95%.

3. Rich in various trace elements: Includes nitrogen, phosphorus, potassium, and calcium, among others. The concentrations of nitrogen and phosphorus can reach several thousand and several hundred milligrams per liter, respectively.

4. Prone to the growth of mycotoxins, pathogenic bacteria, and pathogenic microorganisms.

5. Rich in proteins, cellulose, and starch, with good biodegradability.

6. Abundant in oils and fats, including both animal and vegetable oils. In wastewater, these fats exist as dissolved oil, emulsions, and suspensions.

7. Does not contain toxic substances.

The designed treatment capacity for this project is 50 m³/d, with 24-hour operation. The designed capacity for the anaerobic system is 60 m³/d.

Process flow:

Kitchen wastewater (after oil separation) → collection tank → air flotation unit → CSTR anaerobic reactor → fluidized anaerobic reactor → intermediate sedimentation tank → two-stage A/O → MBR tank → micro-flocculation sedimentation tank → clean water tank