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This paper summarizes the research progress of sludge resource utilization technology, analyzes the mechanism of different pretreatment processes on the dissolution of sludge substances and the dissolution effect, and compares the advantages and shortcomings of different pretreatment methods; summarizes the resource recycling and utilization pathways such as protein recovery, alginate recovery and anaerobic fermentation after sludge pretreatment; and provides suggestions and perspectives on the engineering application of sludge pretreatment and resource utilization. The recommendations and prospects for the engineering application of sludge pretreatment and resource utilization are also provided. [ABSTRACT FROM AUTHOR]

The hazards of sludge, the status quo of treatment and disposal, and the preparation process of sludge ceramsites were summarized・ The application and mechanism of sludge ceramsites in the adsorption of nitrogen, phosphorus, heavy metals, organic matter and turbidity removal are systematically reviewed, so as to provide a reference for sludge ceramsites in the field of sewage treatment. The limitations of sludge ceramsites in water purification are analyzed, and its future development direction is prospected. [ABSTRACT FROM AUTHOR]