Landfill leachate recirculation in Harbin, China reduces leachate production by 87.6%, improving leachate quality and waste stabilization. Recirculation lowers levels of harmful substances like TOC, COD, BOD, and NH+4-N, making treatment easier. It also enhances waste breakdown and landfill efficiency, showing it's a feasible method for on-site leachate treatment in cold regions like northeast China.