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Nitrogen removal in leachate using carrousel activated sludge treatment process
1Department of Civil and Environmental Engineering, Christian Brothers University, Memphis, Tennessee, USA. llin@cbu.edu
Summary
The Carrousel Activated Sludge Treatment Process (CASTP) effectively removes ammonium nitrogen from landfill leachate. Optimizing system detention time and sludge retention time enhances removal efficiency, crucial for wastewater treatment plant stability.
Area of Science:
- Environmental Engineering
- Wastewater Treatment Technologies
Background:
- Landfill leachate contains high ammonium nitrogen concentrations, potentially disrupting municipal wastewater treatment plants.
- The Carrousel Activated Sludge Treatment Process (CASTP) offers advantages for treating such challenging effluents.
Purpose of the Study:
- To evaluate the application of CASTP for ammonium nitrogen removal from landfill leachate.
- To investigate the kinetic reactions and key operational parameters influencing ammonium nitrogen removal in CASTP.
Main Methods:
- Pilot studies were conducted to assess ammonium nitrogen and nitrate nitrogen removal using a conventional CASTP.
- Kinetic reactions and the impact of system detention time (SDT) and sludge retention time (SRT) were analyzed.
Main Results:
- The CASTP demonstrated effective ammonium and nitrate nitrogen removal, achieving 50-85% reduction.
- High circulation and low dissolved oxygen in CASTP facilitated nitrification and denitrification.
- System detention time (SDT) was identified as a more critical parameter than sludge retention time (SRT).
Conclusions:
- CASTP is a viable technology for ammonium nitrogen removal from landfill leachate.
- Optimal performance, achieving over 85% ammonium nitrogen removal, was observed with an SDT of 24 hours and an SRT of 25 days.