Abstract
AbstractThe Box–Behnken statistical experimental design was used to investigate the effects of operating parameters on thermo‐alkaline disintegration of sludge. The optimum disintegration degree was 77.83% at 90°C, 0.2 mol/L NaOH and 25 min retention time. The coefficient of determination (R2) of 97.68% confirms that the model has a very good fitness with the experimental variables. The effects of a thermo‐alkaline disintegration on the performance of the thermophilic anaerobic digestion of sludge were also investigated. The thermo‐alkaline pretreatment showed an initial solubilization effect and methane production (0.73 (L/Lr.day) increased up to around 54% compared to raw sludge (0.48 L/Lr.day). VS removal in disintegrated digester (65.87%) increased of 13.13% compared to conventional sludge digester (52.74%) at the end of the operation. Similarly, methane contents in the biogas of digester fed with disintegrated sludge (71.14%) increased of 6.44% compared to conventional sludge digester (64.7%).
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