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  • Title: Optimized alkaline pretreatment of sludge before anaerobic digestion.
    Author: Li H, Li C, Liu W, Zou S.
    Journal: Bioresour Technol; 2012 Nov; 123():189-94. PubMed ID: 22940318.
    Abstract:
    NaOH was used to disintegrate a mixture composed mainly of primary sludge with biofilm sludge before anaerobic digestion in batch experiments. NaOH pretreatment dissolved some organic substances, and the optimum dose was 0.1mol/L. After the alkali-treated sludge was fed into the digesters, the higher pH delayed the start of digestion and reduced the biogas production during the initial stage, although the system recovered after a lag phase when the dose was lower than 0.04mol/L. Acid conditioning was necessary, but the increased salinity also impacted on the digestion efficiency. For sludge pretreatment, the optimum NaOH dose was 0.1mol/L, and the initial pH of the batch digesters needs to be controlled at less than eight. Under optimized conditions, the organic degradation rate was 38.3% and the biogas yield was 0.65L/g volatile suspended solid (VSS), whereas these values for the control were 30.3% and 0.64L/g VSS, respectively.
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