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Abstract
This work analyzed the feasibility of pre-treatments to improve the anaerobic digestion (AD) of waste activated sludge (WAS) at 20°C. We investigated different physicochemical pre-treatments (thermal at 115°C, thermo-alkaline at pH 10 and 70°C and ozonation at 190mg-O3L−1) by comparing their performances about COD solubilization and sludge disintegration rate. Best performances were obtained by thermo-alkaline pre-treatment, followed by thermal and ozonation; results were consistent with literature. Pre-treated WAS was fed to 12 1-L anaerobic digesters operated in semi-continuous mode. Thermal and thermo-alkaline reactors produced biogas yields (0.30–0.36m3kg−1 VS in standard conditions, 65–70 % methane) analogous to mesophilic conditions. The economic assessment of the scale-up of the whole process demonstrated that thermo-alkaline pre-treatment made AD at 20°C economically profitable for WAS generated by a 20,000 PE WWTP.
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