Li W, Xu G
a NUS Environment Research Institute , National University of Singapore , Singapore , Singapore.
b State Key Laboratory of Multi-Phase Complex Systems , Institute of Process Engineering, Chinese Academy of Sciences , Beijing , People's Republic of China.
Environ Technol. 2017 Aug;38(15):1843-1851. doi: 10.1080/09593330.2016.1238963. Epub 2016 Oct 11.
In this work, the toxicity of imidazolium-based ionic liquids (ILs) and the enhancement of high-solid anaerobic digestion by pretreatment were studied. Compared with [Bmim]Cl, [Bmim]OAc and [Bmim]BF, [Bmim]PF had the highest toxicity. When the mass ratio of [Bmim]PF to grass was higher than 1:10, biogas was not produced within 30 days. The ability to remove lignin and hemicellulose followed the sequence of [Bmim]OAc, [Bmim]Cl, [Bmim]BF and [Bmim]PF. The crystallinity index of grass pretreated with [Bmim]OAc, [Bmim]Cl, [Bmim]BF and [Bmim]PF reduced by 73.83%, 54.44%, 17.52% and 7.47%, respectively. The pretreatment with ILs enhanced the methane yield of grass by reducing crystallinity and particle size. The grass pretreated with [Bmim]OAc had the highest methane yield, about 221 mL/g volatile solids, due to its good lignin removal ability and relative low toxicity. After 10 times recycling, the cumulative methane yield of grass pretreated by recycled [Bmim]OAc decreased by 11.95%.
在本研究中，对咪唑基离子液体（ILs）的毒性以及预处理对高固体厌氧消化的促进作用进行了研究。与[Bmim]Cl、[Bmim]OAc和[Bmim]BF相比，[Bmim]PF的毒性最高。当[Bmim]PF与草的质量比高于1:10时，30天内未产生沼气。去除木质素和半纤维素的能力顺序为[Bmim]OAc、[Bmim]Cl、[Bmim]BF和[Bmim]PF。用[Bmim]OAc、[Bmim]Cl、[Bmim]BF和[Bmim]PF预处理的草的结晶度指数分别降低了73.83%、54.44%、17.52%和7.47%。离子液体预处理通过降低结晶度和粒径提高了草的甲烷产量。由于其良好的木质素去除能力和相对较低的毒性，用[Bmim]OAc预处理的草的甲烷产量最高，约为221 mL/g挥发性固体。经过10次循环后，用循环使用的[Bmim]OAc预处理的草的累计甲烷产量下降了11.95%。
