Conditioning Landfill Sludge With Ferric Chloride And A Fenton Reagent

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• Compression experiments and consolidation experiments are compared, and the coefficient of compressibility and compression index are obtained and compared. Then, the sludge permeability, grain size distribution variations, specific resistance to filtration (SRF) and morphology observations are considered to analyse the treatment mechanism.

• The results indicate that the properties of landfill sludge will change as the curing time increases. FeCl₃ and Fenton are both effective in improving the consolidation and permeability properties of sludge. For the conditioning process, the optimum FeCl₃ content is 20%, and the process is dominated by coagulation if FeCl₃ is less than 20%; otherwise, it is dominated by hydrolysis.

• For the Fenton reagent, the optimum Fe²⁺ content and H₂O₂ content are 4% and 12%, respectively. The depolymerization effect of the Fenton reagent leads to the oxidation and recombination of the polar group on extracellular polymeric substances (EPSs). The results can be used to explain the conditioning mechanism of the effective agents of FeCl₃ and Fenton and compare the corresponding consolidation properties. The consolidation characteristics provide a reference for further application of vacuum preloading in the sludge disposal process.

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