Why is the treatment of landfill leachate so challenging?

Characteristics of landfill leachate: 

a. Complex composition;

b. High content of organic pollutants and NH₄⁺-N;

c. High levels of heavy metals, dark in color, and with unpleasant odor;

d. Imbalanced ratio of microbial nutrients;

e. High content of COD and BOD, with COD reaching 10⁴ O₂mg/L and BOD also reaching 10³ O₂mg/L. 

Challenges of existing technologies:

Currently, most systems use MBR+RO membrane concentration processes as core equipment. While the process can meet discharge requirements, it has the following shortcomings:

a. The membrane operation requires high pressure and high circulation crossflow filtration, leading to high energy consumption and operational costs;

b. Long-term membrane operation is prone to fouling and scaling, requiring regular backwashing, acid/base cleaning, etc. The operation is complex, requiring significant manpower, and stable operation over long periods is difficult;

c. Membranes have a short service life and need to be replaced periodically, which incurs high replacement costs;

d. The process generates 30-40% concentrated liquid, which is extremely difficult to treat. Using methods like evaporation for treatment incurs very high investment and operational costs.

Combination of Ozone Catalytic Oxidation & Flotation:

This technology creatively combines multiple technologies, including Ozone Multi-Catalytic Oxidation, Cyclonic Flow, and Dissolved Gas techniques, to achieve highly efficient and comprehensive treatment of leachate. It can rapidly reduce COD, ammonia nitrogen, color, odor, and bacteria, among others. The overall technology is at the international advanced level and has obtained over 10 patents, including one international PCT patent. The Ozone Catalytic Oxidation - Flotation Integrated Technology can overcome the limitations of membrane processes and effectively address the challenges of deep treatment of leachate.

a. Fast reaction rate and small footprint.

b. High ozone utilization, with consumption only about 1/3 to 1/2 of traditional technologies.

c. Dual effect of ozone catalytic oxidation and flotation, with high overall pollutant removal efficiency.