The working principle of garbage leachate wastewater treatment.

• Project Background

### Characteristics of the water quality of landfill leachate wastewater (brief version)

1. Complex composition: It contains various organic compounds, heavy metals, and a large number of microorganisms.

2. High pollutant concentration: It has high contents of COD, BOD, etc., with significant variations.

3. High ammonia - nitrogen content: The ammonia - nitrogen content increases with the landfill time and can inhibit biological treatment.

4. Great water quality variation: It is significantly affected by factors such as the composition of waste, landfill time, and climate.

• Design water quality and flow

1. Major structure list

Technology flow chart ： Equalization tan ---Electric flocculation air flotation ---Flocculation tank---DAF tank---Anoxic tank---MBBR aerobic tank1+2---Settling tank---Middle water tank---Sand+ carbon filter---Clean water tank---UV disinfection---discharge or reuse

1. Equalization tank:

    - Regulate the volume and quality of wastewater to ensure stable operation of subsequent treatment units.

2. Electric flocculation air flotation:

    - Generate flocculants through electrochemical reactions. Remove some suspended solids, colloids, and oils by air flotation.

3. Flocculation tank:

    - Add flocculants to agglomerate fine particles into large flocs.

4. DAF tank (Dissolved Air Flotation tank):

    - Release dissolved air water to produce tiny bubbles, which attach to flocs and float them up for separation and removal of pollutants.

5. Anoxic tank:

    - Conduct denitrification reactions to remove some nitrate nitrogen.

6. MBBR aerobic tank1 + 2 (Moving Bed Biofilm Reactor aerobic tanks 1 and 2):

    - Use microorganisms to decompose organic matter and further remove ammonia nitrogen.

7. Settling tank:

    - Separate sludge from water, allowing sludge to settle and obtaining clear effluent.

8. Middle water tank:

    - Store intermediate - treated water, regulate water volume, and provide stable influent for subsequent treatment.

9. Sand + carbon filter:

    - The sand filter removes fine suspended solids, and the carbon filter adsorbs organic matter, residual chlorine, etc.

10. Clean water tank:

    - Store the treated water that meets the standards.

11. UV disinfection:

    - Kill bacteria, viruses, and other pathogenic microorganisms in the water.

12. Discharge or reuse:

    - The up - to - standard water can be discharged into the environment or reused in appropriate production processes.