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Water scarcity is a global crisis, and particularly of concern in arid regions like Morocco. One creative solution is mining unusual water sources, such as landfill leachate. The presence of nitrogen in the sediment was studied as part of the use of phosphate lime sludge in treating landfill leachate for irrigation purposes. A volume of 40 liters of landfill leachate was treated with three different concentrations of phosphate lime sludge (25%, 35%, and 50%). After homogenization and agitation of the mixture for 24 to 36 hours, it was permitted to settle through the concrete decantate and supernatant. Nitrogen was efficiently decanted into the sediment during the composting process with green waste, enhancing the quality of the finished compost. The supernatants underwent physicochemical and microbiological analyses to ascertain their suitability for irrigation. The findings showed that the number of fecal streptococci decreased by 98.93%, and the organic matter content in the sediment increased from 6.4% to 13.5%, corresponding to an increase of 110.94%, suggesting that the leachate had partially depolluted. The pH and electrical conductivity of the supernatants were within irrigation guidelines. The safety of diluted supernatants for plant germination was verified by phytotoxicity experiments conducted on maize seeds. The compost made from the decantate and green waste showed acceptable physical and chemical properties.
