This study investigated the mechanisms involved in CO₂ sequestration under the sequence batch and semi-continuous operation using wollastonite in sludge anaerobic digestion. Wollastonite substantially elevated CH₄ content in biogas and played a role in CO₂ capture. It increased biogas yield of the glucose due to pH buffering effect but did not increase that of the hydrolysate from thermal alkali pretreated sludge. Under the semi-continuous operation, wollastonite improved the CO₂ sequestration, but decreased the biogas yield from 166 to 24 mL/g soluble chemical oxygen demand, since seemingly wollastonite residues inhibited microbes in the sludge. However, the use of dialysis bags to wrap wollastonite offset the negative impact of the wollastonite residues in the sludge, thereby increased biogas yield. The present study is conducive to understanding the mechanisms involved in and proving the feasibility of the CO₂ sequestration using wollastonite in sludge anaerobic digestion and its impacts on long-term operation. Consequently, the findings of the study provide key parameters and useful guidelines for scaling up and wollastonite application in anaerobic digestion of sewage sludge.

本研究研究了硅灰石在污泥厌氧消化中使用硅灰石在顺序间歇和半连续操作下封存CO ₂的机制。硅灰石显着提高了沼气中的CH ₄含量，并在 CO ₂捕获中发挥了作用。由于 pH 缓冲作用，它增加了葡萄糖的沼气产量，但没有增加来自热碱预处理污泥的水解产物的产量。在半连续操作下，硅灰石改善了 CO ₂封存，但将沼气产量从 166 mL/g 可溶性化学需氧量降低到 24 mL/g，因为看似硅灰石残留物抑制了污泥中的微生物。然而，使用透析袋包裹硅灰石抵消了污泥中硅灰石残留的负面影响，从而提高了沼气产量。本研究有助于了解硅灰石在污泥厌氧消化中使用硅灰石封存CO ₂的可行性及其对长期运行的影响的机制。因此，该研究的结果为扩大硅灰石在污水污泥厌氧消化中的应用提供了关键参数和有用的指导方针。