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Film and Diffusion Kinetics of Ammonium Removal from Leachate in an Up-Flow Anaerobic Sludge Blanket Reactor

Year: 2026

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Understanding NH 4 + removal from leachate mediated by anaerobic sludge (AS) development could lead to the creation of effective, designed biodegradation technologies in the future. This study utilized an up-flow anaerobic sludge blanket (UASB) reactor equipped with a gas–liquid–solid separator to investigate NH 4 + removal from landfill leachate, enhancing understanding of the biosorption kinetics involved. AS development was initially unstable but progressively improved, exhibiting greater stability with increasing NH 4 + concentration over the experimental duration. The UASB process performance increased from 15.32 to 63.38% efficiency with an increase in NH 4 + concentration from 141.71 to 360.59 mg/L. The trend in increased NH 4 + removal closely mirrored CH 4 production but exceeded COD removal over the experimental duration. The internal mass transfer (IMT) rate variation closely tracked the global mass transfer rate but remained significantly higher than the external mass transfer (EMT) rate, indicating EMT-controlled mass transfer resistance throughout the 197-day experiment. Analysis of NH 4 + biosorption kinetics in leachate provides new insights into UASB process performance, highlighting the importance of IMT rates, which could inform advanced landfill leachate treatment plant design in the future. Understanding the COD/N/P ratio is crucial for optimizing UASB process efficiency, warranting further research on comparative biosorption kinetics of COD, NH 4 +, and PO 4 3– removal from leachate to gain comprehensive insights into landfill leachate treatment.

Source: ACS Omega

DOI: 10.1021/acsomega.5c07168