State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2021 Aug;333:125166. doi: 10.1016/j.biortech.2021.125166. Epub 2021 Apr 16.
Anaerobic co-digestion of a cow manure-cotton straw mixture (CCM) has been shown to promote methanogenesis, but the recalcitrant crystal structure of organic polymers in CCM hinders its hydrolysis during anaerobic digestion (AD). Here, the efficacy of different pretreatment methods based on potassium ferrate (PF) and peroxymonosulfate (PMS) was evaluated to facilitate CCM decomposition and methanogenesis during AD. The maximum lignocellulosic removal rate (62.5%), the highest volatile fatty acids (VFAs) (7769.6 mg/L), and cumulative methane yield (109.4 mL CH/g VS) were both achieved in PF-pretreated samples after the digestion process. The dominant bacterial populations in PF-pretreated CCM were affiliated with Sideroxydans, Herbinix, Clostridium, and Smithella, which played an important role in the hydrolysis and acidification of CCM. The enrichment of Methanosarcina and Methanobacterium and highly-effective acidogenesis might account for the highest methane yield in the PF-pretreated group.
牛粪-棉秆混合物（CCM）的厌氧共消化已被证明可以促进产甲烷，但CCM 中有机聚合物的顽固晶体结构会阻碍其在厌氧消化（AD）过程中的水解。在此，评估了基于高铁酸钾（PF）和过一硫酸盐（PMS）的不同预处理方法对促进 AD 中 CCM 分解和产甲烷的效果。在消化过程后，PF 预处理样品的木质纤维素去除率最高（62.5%）、挥发性脂肪酸（VFAs）最高（7769.6mg/L）、累积甲烷产量（109.4mL CH/g VS）最高。PF 预处理 CCM 中的优势细菌种群与 Sideroxydans、Herbinix、Clostridium 和 Smithella 有关，它们在 CCM 的水解和酸化过程中发挥了重要作用。Methanosarcina 和 Methanobacterium 的富集以及高效的产酸作用可能是 PF 预处理组中甲烷产量最高的原因。
