Views: 888 Author: Site Editor Publish Time: 2026-09-11 Origin: Site
In the environmental protection industry, landfill leachate is often known as the “king of wastewater.” It is characterized by complex composition, high pollutant concentrations, heavy oil and grease content, high suspended solids (SS), and significant fluctuations in water quality and flow rate. A weak link at any stage of treatment can affect the performance of the entire process.
At a comprehensive waste treatment industrial park, landfill leachate is typically treated by anaerobic digestion to produce biogas. After three-phase separation, the resulting effluent is known as landfill leachate digestate.
However, passing through anaerobic digestion does not mean the treatment challenge is over.
Residual oil, grease, and suspended solids (SS) can still remain at significant levels in the digestate. If they are not effectively removed during pretreatment, they can increase the load on downstream biological treatment systems and may even cause fouling and clogging of membrane components in advanced treatment processes.
If pretreatment is not done properly, everything downstream becomes more difficult.
This time, Yosun’s Dissolved Air Flotation (DAF) System successfully took on this challenging pretreatment task at a comprehensive waste treatment industrial park in Beijing, delivering clear and visible results.
Project Location: A comprehensive waste treatment industrial park in Beijing, China
Wastewater: Landfill leachate digestate, generated after anaerobic digestion
⚙️ Application: DAF pretreatment after three-phase separation
Treatment Objective: Oil and grease removal + SS removal
In this treatment process, landfill leachate first enters an anaerobic reactor for biogas production and three-phase separation.
The resulting digestate then enters the Yosun DAF System for pretreatment, where residual oil, grease, and suspended solids are effectively removed. This helps reduce the burden on downstream treatment units and provides more stable operating conditions for subsequent processes.
Since commissioning, the equipment has maintained stable operation.
Inside the flotation tank, fine microbubbles attach to residual oil, grease, and suspended solids in the digestate and efficiently lift them to the water surface. A clear and dense float layer forms and is continuously removed by the sludge scraping system.
The flotation tank operates with strong and controlled upward movement, without excessive turbulence or re-mixing.
This is a clear indication of effective Dissolved Air Flotation operation.
The landfill leachate digestate, with its residual oil and high SS content, undergoes efficient oil-water and solid-liquid separation inside the Yosun DAF System.
No description is more convincing than a direct visual comparison.
On site, the operators collected two bottles of water—one from the DAF influent and the other from the DAF effluent—and placed them side by side.
Influent: Dark and turbid, with clearly visible suspended solids.
Effluent: Clear and bright, with almost no visible suspended solids.
The same landfill leachate digestate looks completely different before and after DAF treatment.
This visible improvement indicates effective removal of residual oil, grease, and suspended solids. More importantly, it helps:
✅ Reduce the load on downstream biological treatment systems, supporting more stable operation.
✅ Protect advanced treatment membrane components from oil and suspended solids fouling and clogging, helping extend membrane service life.
✅ Improve the reliability and operating economics of the entire leachate digestate treatment process.
At this moment, the value of effective pretreatment is clear to see.
Based on the characteristics of digestate, including residual oil, grease, and high suspended solids, Yosun optimizes the dissolved air release system and flotation structure to achieve efficient oil-water and solid-liquid separation in one treatment stage.
Landfill leachate digestate can experience fluctuations in both water quality and flow rate. The Yosun DAF System is designed to maintain stable separation performance under changing operating conditions.
As a pretreatment unit, the DAF system helps protect downstream biological and membrane treatment systems while reducing the overall operation and maintenance burden.
From domestic wastewater treatment in the Xizang Plateau to landfill leachate digestate treatment in Beijing, Yosun DAF Systems continue to demonstrate their performance in demanding real-world applications.
The more challenging the wastewater, the more reliable the equipment needs to be.
From the high-altitude environment of Xizang to the capital city of Beijing, and from domestic wastewater to landfill leachate digestate, Yosun DAF Systems are operating reliably in an increasing number of challenging wastewater treatment applications.
We do not focus on concepts. We focus on actual operation.
We do not compete with slogans. We let the effluent speak for itself.
One bottle of influent. One bottle of effluent.
That is Yosun’s answer.
Yosun Environmental Equipment
Treating Every Drop of Water with Care.
