Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden; Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand.
Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden.
Bioresour Technol. 2021 Feb;321:124456. doi: 10.1016/j.biortech.2020.124456. Epub 2020 Nov 27.
Cow manure (CM) generation in large volumes has for long been considered a waste management challenge. However, the organic content of CM signals opportunities for the production of value-added bioproducts such as volatile fatty acids (VFAs) through anaerobic digestion (AD). However, a robust VFAs fermentation process requires effective methane formation inhibition and enhance VFAs recovery. In this study, thermal pretreatment was applied to inhibit methanogens for enhanced VFAs production and an immersed membrane bioreactor (iMBR) for in situ recovery of VFAs in a semi-continuous AD. Maximal VFAs yield of 0.41 g VFAs/g volatile solids (VS) was obtained from thermally-treated CM without inoculum addition. The CM was further fed to the iMBR operating at organic loading rates of 0.8-4.7 gVS/L.d. The VFAs concentration increased to 6.93 g/L by rising substrate loading to 4.7 g VS/L.d. The applied iMBR set-up was successfully used for stable long-term (114 days) VFAs production and recovery.
大量牛粪（CM）的产生长期以来一直被认为是废物管理的挑战。然而，CM 的有机含量为通过厌氧消化（AD）生产增值生物制品（如挥发性脂肪酸（VFAs））提供了机会。然而，一个强大的 VFAs 发酵过程需要有效地抑制产甲烷菌并提高 VFAs 的回收。在这项研究中，采用热预处理来抑制产甲烷菌以提高 VFAs 的产量，并在半连续 AD 中采用浸入式膜生物反应器（iMBR）原位回收 VFAs。从未经接种的热处理 CM 中获得了 0.41 g VFAs/g 挥发性固体（VS）的最大 VFAs 产率。CM 进一步进料到 iMBR 中，操作有机负荷率为 0.8-4.7 gVS/L.d。通过将基质负荷增加到 4.7 g VS/L.d，VFAs 浓度增加到 6.93 g/L。所应用的 iMBR 装置成功用于稳定的长期（114 天）VFAs 生产和回收。
