School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Collaborative Innovation Center of Water Treatment Technology and Material, Suzhou University of Science and Technology, Suzhou 215011, China.
Waste Manag. 2024 Apr 15;178:331-338. doi: 10.1016/j.wasman.2024.02.041. Epub 2024 Mar 1.
The combination of microbial electrolytic cells and anaerobic digestion (MEC-AD) became an efficient method to improve CO capture for waste sludge treatment. By adding CaCl and wollastonite, the CO sequestration effect with mineral carbonation under 0 V and 0.8 V was studied. The results showed that applied voltage could increase dissolved chemical oxygen demand (SCOD) degradation efficiency and biogas yield effectively. In addition, wollastonite and CaCl exhibited different CO sequestration performances due to different Ca release characteristics. Wollastonite appeared to have a better CO sequestration effect and provided a wide margin of pH change, but CaCl released Ca directly and decreased the pH of the MEC-AD system. The results showed methane yield reached 137.31 and 163.50 mL/g SCOD degraded and CO content of biogas is only 12.40 % and 2.22 % under 0.8 V with CaCl and wollastonite addition, respectively. Finally, the contribution of chemical CO sequestration by mineral carbonation and biological CO sequestration by hydrogenotrophic methanogenesis was clarified with CaCl addition. The chemical and biological CO sequestration percentages were 46.79 % and 53.21 % under 0.8 V, respectively. With the increased applied voltage, the contribution of chemical CO sequestration rose accordingly. The findings in this study are of great significance for further comprehending the mechanism of calcium addition on CO sequestration in the MEC-AD system and providing guidance for the later engineering application.
微生物电解池与厌氧消化（MEC-AD）的结合成为提高废泥处理中 CO 捕集效率的有效方法。通过添加 CaCl 和硅灰石，研究了在 0 V 和 0.8 V 下矿物碳化的 CO 固存效果。结果表明，施加电压可以有效提高溶解化学需氧量（SCOD）降解效率和沼气产量。此外，由于 Ca 释放特性的不同，硅灰石和 CaCl 表现出不同的 CO 固存性能。硅灰石似乎具有更好的 CO 固存效果，并提供了较大的 pH 值变化余地，但 CaCl 直接释放 Ca，降低了 MEC-AD 系统的 pH 值。结果表明，在 0.8 V 下添加 CaCl 和硅灰石时，甲烷产量分别达到 137.31 和 163.50 mL/g SCOD 降解，沼气中 CO 含量分别仅为 12.40%和 2.22%。最后，通过添加 CaCl 阐明了矿物碳化的化学 CO 固存和氢营养型产甲烷的生物 CO 固存的贡献。在 0.8 V 下，化学和生物 CO 固存百分比分别为 46.79%和 53.21%。随着施加电压的增加，化学 CO 固存的贡献相应增加。本研究的结果对于进一步理解钙添加对 MEC-AD 系统中 CO 捕集的机制具有重要意义，并为后续的工程应用提供了指导。
