Abstract: Sludge dewatering remains a global environmental challenge in wastewater treatment. The Fenton conditioning process, extensively investigated for its exceptional dewatering efficiency, generates significant quantities of Fe-rich sludge requiring sustainable management solutions. To address this issue, a new process of Fe-rich biochar partial reused as conditioner for deep dewatering - land application has been developed in the previous study. This research employs Life Cycle Assessment (LCA) to quantitatively compare the environmental impacts between the novel sludge treatment process and conventional Fenton-alkaline conditioning with subsequent sanitary landfill disposal process. It was showed that the new process will bring remarkable environmental benefits for reduce the global warming potential, acidification potential, eutrophication potential, inhalable inorganic substances and ecotoxicity, which were reduced by 75.12%, 44.26%, 4.96%, 22.86% and 63.92% respectively, based on the research results. Standardized environmental impact potential analysis reveals an overall 21.71% decrease in total environmental burdens, conclusively demonstrating the significant ecological benefits of implementing iron-containing sludge recycling through pyrolysis technology. 

Key words:  , Sewage sludge, Fenton condition process, sludge recycling, Fe-rich sludge biochar, life cycle assessment