Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, S117576, Singapore.
NUS Environment Research Institute, National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore.
Sci Total Environ. 2022 Apr 15;817:152968. doi: 10.1016/j.scitotenv.2022.152968. Epub 2022 Jan 10.
The effects of different recovery strategies on inhibited anaerobic digestion (AD) of food waste (FW) was examined in this study, with the finding that dosing pine woodchip biochar could reverse the effect of volatile fatty acids (VFA) inhibition (mainly propionic acid) and yielded 105.55% more methane than the control. The addition of nano-zerovalent iron (nZVI) promoted the generation of VFA while causing a slight inhibition of the methanogens initially. In due time, the nZVI digester was able to recover and eventually produced 192.22% more methane compared to the control. Finally, nZVI-modified biochar was proved to be able to avoid the inhibitory effects brought about by the nanoparticles. The results indicated reduced dosage requirements as compared to using pristine pine woodchip biochar and accumulated 204.84% more methane than the control. The introduction of nZVI-biochar also promoted the growth of Methanosarcina species methanogens, which can perform direct-interspecies electron transfer. While all the recovery strategies using the additives were feasible, the results suggested that the use of modified biochar holds great potential as a significantly lower amount of amendment is required for the recovery of the inhibited AD system.
本研究考察了不同恢复策略对抑制性食物废物（FW）厌氧消化（AD）的影响，结果发现投加松木屑生物炭可以逆转挥发性脂肪酸（VFA）抑制（主要是丙酸）的作用，比对照产甲烷量多 105.55%。添加纳米零价铁（nZVI）促进了 VFA 的生成，同时对产甲烷菌最初产生了轻微的抑制作用。随着时间的推移，nZVI 消化器能够恢复，最终比对照产甲烷量多 192.22%。最后，证明 nZVI 改性生物炭能够避免纳米颗粒带来的抑制作用。结果表明，与使用原始松木屑生物炭相比，所需的用量减少，比对照产甲烷量多 204.84%。nZVI-生物炭的引入还促进了能够进行直接种间电子转移的 Methanosarcina 属产甲烷菌的生长。虽然所有使用添加剂的恢复策略都是可行的，但结果表明，改性生物炭的使用具有很大的潜力，因为对于抑制的 AD 系统的恢复，所需的修正剂用量明显减少。
