Feasibility study on enhancing the biodegradability of fresh and old landfill leachate using combined chemical precipitation and Fenton processes.
Rasolevandi T, Naddafi K, Hassanvand MS, Hadi M, Alimohammadi M
Soil Health
Landfill leachate seeping into surrounding soil can silently load heavy metals like arsenic into the ground where vegetables and garden plants grow, persisting for generations — cleaner treatment methods like this could reduce that invisible contamination risk near residential areas.
Landfills produce a highly toxic liquid called leachate that contains heavy metals and chemicals capable of poisoning soil and groundwater. Scientists in Tehran tested a three-step cleaning process using lime, air stripping, and a chemical reaction process to break down or capture the most dangerous pollutants. The method worked well, removing more than 93% of arsenic and ammonia, making the liquid far less harmful before it reaches the broader environment.
Key Findings
Arsenic removal reached 93% in fresh leachate and 66% in old leachate using lime precipitation at optimized doses of 9 g/L and 18 g/L respectively
Ammonia nitrogen removal hit 93% efficiency in both fresh and old leachate types following ammonia stripping
Fenton oxidation conditions were fine-tuned using Box-Behnken statistical design to maximize breakdown of persistent organic compounds
chevron_right Technical Summary
Researchers tested a three-stage chemical treatment process — lime precipitation, ammonia stripping, and Fenton oxidation — to detoxify landfill leachate before it enters water systems, achieving over 93% removal of arsenic and ammonia nitrogen in both fresh and aged leachate samples.
Abstract Preview
Landfill leachate (LL), due to its high concentrations of heavy metals, ammonia nitrogen (NH₃-N), and persistent organic compounds, requires effective pretreatment before biological treatment. This...
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