Abstract Lime pretreatment was tested at different doses on high-solid sludge. Subsequently, the effects of this pretreatment were investigated in terms of the damage of extracellular polymeric substance and cell structures and the subsequent high-solid anaerobic digestion (HSAD). Moreover, the relationship between them was discussed. Results showed that higher lime dose was favorable to COD solubilization, wherein more proteins were released than carbohydrates under the same lime dose. When lime dose was below 0.04 g/g-TS, the COD solubilization was mainly caused by the disintegration of EPS, and when the lime dose was higher than 0.06 g/g-TS, the damages of cell walls and membranes were observed and led to the further COD solubilization. The HSAD process was accelerated by 7–16 days after lime pretreatment, and the biogas production increased by 22.9%–34.8% when lime dose was higher than 0.04 g/g-TS. Thermogravimetric analysis results suggested that Ca2+ could be removed from the liquid phase by precipitating with the CO2 produced during the HSAD process, thereby increasing the methane content.

中文翻译：

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Ca(OH)2 分解对高固污泥絮体结构和后续厌氧消化的评价

摘要 对不同剂量的石灰预处理高固污泥进行了试验。随后，从细胞外聚合物和细胞结构的损伤以及随后的高固体厌氧消化（HSAD）方面研究了这种预处理的影响。此外，还讨论了他们之间的关系。结果表明，较高的石灰剂量有利于 COD 的溶解，在相同的石灰剂量下，释放的蛋白质多于碳水化合物。当石灰用量低于 0.04 g/g-TS 时，COD 溶解主要是由 EPS 的崩解引起的，当石灰用量高于 0.06 g/g-TS 时，观察并导致细胞壁和膜的损坏进一步溶解COD。石灰预处理后 HSAD 过程加速了 7-16 天，当石灰用量高于0.04 g/g-TS时，沼气产量增加了22.9%~34.8%。热重分析结果表明，Ca2+ 可以通过与 HSAD 过程中产生的 CO2 一起沉淀而从液相中去除，从而增加甲烷含量。