Application Cases Of Landfill Leachate

Project Background

Landfill leachate treatment is a key technology for managing landfill leachate. With the increasing number of landfills, effective management and treatment of leachate has become particularly important. This case study analyses leachate treatment at a landfill in Shandong Province, demonstrating how our advanced leachate collection system and efficient treatment technology improved the efficiency of leachate wastewater treatment and met environmental emission standards.

Landfill Leachate Treatment Technology

Landfill leachate mainly originates from water seeping through waste during accumulation and from external precipitation. The leachate has complex water quality, containing large amounts of suspended solids and organic and inorganic pollutants. Its typical pH value is usually low, being acidic or neutral.

The characteristics of leachate result in high biochemical oxygen demand (BOD) and chemical oxygen demand (COD), and it is rich in nitrogen and phosphorus, causing significant environmental pollution. Therefore, stringent requirements are imposed on leachate treatment methods, and the appropriate treatment process is selected based on the specific composition of the leachate.

Nanofiltration System Diagram

Collection And Treatment Methods

An advanced leachate collection system has been adopted at this landfill to ensure that all leachate is collected promptly and transported to the treatment facility. Through precise management of the collection system, overflow and the spread of pollution caused by leachate leaks are avoided. The collected leachate is primarily treated using a combination of physico-chemical and biological methods.

Step 1: Remove large suspended solids from the leachate using sedimentation tanks.

Step 2: Apply reverse osmosis and nanofiltration systems for advanced treatment to efficiently remove dissolved pollutants.

Step 3: Integrate biological treatment technology to further reduce the BOD, COD, and other organic pollutant content in the leachate. The entire leachate wastewater treatment process not only effectively removes pollutants but also significantly improves the reliability of meeting water quality standards for discharge.

Reverse Osmosis Equipment Diagram

Treatment Results

Before treatment: COD < 40,000; Ammonia Nitrogen < 1,250; Total Nitrogen < 2,580.

After treatment: COD < 350; Ammonia Nitrogen < 10; Total Nitrogen < 50.

After systematic treatment, the COD, BOD, ammonia nitrogen, and other pollutants in the landfill leachate were significantly reduced, and the treatment effect met national environmental emission standards. The typical pH value of the leachate also stabilised within the neutral range after treatment, reducing the potential impact on surrounding water bodies. By optimising the leachate collection system and combining reverse osmosis and nanofiltration systems, the facility effectively overcame common leachate deficiencies, achieving the environmental and resource utilisation goals of leachate wastewater treatment. The treated water quality allows for reuse as recycled water resources, further improving resource utilisation efficiency. 

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