State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China; UN Environment-Tongji Institute of Environment for Sustainable Development, Siping Road, Shanghai 200092, PR China.
School of Mechanical Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, PR China.
Bioresour Technol. 2022 Mar;347:126693. doi: 10.1016/j.biortech.2022.126693. Epub 2022 Jan 10.
This study investigated the effects of calcium hypochlorite (Ca(ClO)) on biomethane generation from sludge two-phase anaerobic digestion system. In first (acidogenic) phase, volatile fatty acids (VFAs) were largely generated when pretreated by Ca(ClO), while the methane yield was severely inhibited. In second (methanogenic) phase, the methane yield was observably enhanced by Ca(ClO). Further calculation showed that the total methane yield from the two phases was firstly promoted from 156.0 ± 4.5 to 269.9 ± 5.2 mL when Ca(ClO) dosage enhanced from 0 to 1.6 g/L, which then reduced to 235.4 ± 5.5 mL when Ca(ClO) content reached 2.0 g/L. Mechanism analysis showed that the suppression of Ca(ClO) on coenzyme F activity was relieved in methanogenic phase, and the abundances of functional microbes in methanogenic phase were enriched when added with Ca(ClO). The Ca(ClO)-based method well realized the balance between efficacy and economy, possessing outstanding potential for large-scale applications.
本研究考察了次氯酸钙（Ca(ClO)）对污泥两相厌氧消化系统生物甲烷生成的影响。在第一阶段（产酸相），经 Ca(ClO)预处理时会大量生成挥发性脂肪酸（VFAs），而甲烷产量则受到严重抑制。在第二阶段（产甲烷相），Ca(ClO)可显著提高甲烷产量。进一步的计算表明，当 Ca(ClO)投加量从 0 增加到 1.6 g/L 时，两相的总甲烷产量从 156.0 ± 4.5 增加到 269.9 ± 5.2 mL，然后当 Ca(ClO)含量达到 2.0 g/L 时，总甲烷产量减少到 235.4 ± 5.5 mL。机理分析表明，在产甲烷相中，Ca(ClO)对辅酶 F 活性的抑制作用得到缓解，同时添加 Ca(ClO)可富集产甲烷相中功能微生物的丰度。基于 Ca(ClO)的方法很好地实现了功效和经济性之间的平衡，具有大规模应用的巨大潜力。
