Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
Bioresour Technol. 2012 Nov;123:189-94. doi: 10.1016/j.biortech.2012.08.017. Epub 2012 Aug 10.
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.
NaOH 被用于在分批实验中进行厌氧消化之前分解主要由初沉污泥和生物膜污泥组成的混合物。NaOH 预处理溶解了一些有机物质，最佳剂量为 0.1mol/L。在碱性处理后的污泥被投入消化器后，较高的 pH 值延迟了消化的开始，并减少了初始阶段的沼气产量，尽管当剂量低于 0.04mol/L 时，系统在滞后阶段后恢复。需要进行酸调节，但增加的盐度也会影响消化效率。对于污泥预处理，最佳的 NaOH 剂量为 0.1mol/L，分批消化器的初始 pH 需要控制在 8 以下。在优化条件下，有机降解率为 38.3%，沼气产量为 0.65L/g 挥发性悬浮固体（VSS），而对照的这些值分别为 30.3%和 0.64L/g VSS。
