Why stripping is considered for leachate and how it fits into a treatment train
Reported combined treatment processes for landfill leachate explicitly include air stripping alongside other unit operations, for example a combined treatment process of air stripping, Fenton, sequencing batch reactor, and coagulation to remove the pollutants in landfill leachate [S1]. Air stripping is also investigated as a route to remove and recover ammonia, including a study that investigates the use of a High-Performance Rotating Reactor (HP2R) combined with a scrubber unit for ammonia removal and recovery from landfill leachate [S3]. Within such trains, stripping can be applied to raw young leachate or to anaerobically treated young landfill leachate as a physical–chemical alternative to nitrification [S4].
Limitations stated in the cited evidence
Practical wastewater, such as landfill leachate, possesses various complex characteristics that have been reported to inhibit ammonia stripping efficiency. [S2]
Quantitative outcome reported in the cited study
The only quantitative ammonia-removal figures stated in the cited excerpts are the values from the experimental study on young leachate and anaerobically treated young landfill leachate: ammonia removals over 90 and 85% for magnesium ammonium phosphate precipitation (MAP) and ammonia stripping at pH 12, respectively [S4].