The paper investigates the effectiveness of the modified Fenton method for secondary treatment of solid waste landfill leachates after preliminary treatment using the aerated lagoon method. The study was conducted in laboratory and semi-industrial conditions.Based on the obtained results of reagent purification of filtrates in laboratory conditions, the optimal doses of working solutions of reagents (polyacrylamide, aluminum and iron sulfates, hydrogen peroxide) were established.The results obtained in laboratory conditions were tested and refined during field studies on a prototype of a filtrate pretreatment unit.
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