Department of Environmental Science and Engineering, Kathmandu University, Dhulikhel, Nepal.
Department of Mathematics and Applications Renato Caccioppoli, University of Naples Federico II, Naples, Italy.
Environ Technol. 2022 Jun;43(14):2190-2196. doi: 10.1080/09593330.2020.1869319. Epub 2021 Jan 6.
Biohythane (hydrogen + methane) production in a two stage dark fermentation (DF) and anaerobic digestion (AD) process from food waste (FW) has been studied. This paper investigated the effect of operation temperature, i.e. mesophilic (34 °C) and thermophilic (55 °C) , on biohythane yield and total energy recovery carried out at the initial culture pH 5.5 and pH 7, respectively for DF and AD batch tests. The mesophilic DF tests gave a higher hydrogen yield of 53.5 (4) mL H/g VS added compared to thermophilic DF tests, i.e. 37.6 (1) mL H/g VS added. However, higher methane yields, i.e. 307.5 ( 10) mL CH/g VS, were obtained at thermophilic AD tests compared to mesophilic AD, i.e. 276.5 (4.3) mL CH/g VS. The total energy recovery from thermophilic DF + AD was higher (11.4 MJ/kg VS) than the mesophilic (10.4 MJ/kg VS) combined process. Interestingly, the analysis of kinetic parameters of mesophilic tests, determined from the Modified Gompertz equation, showed that mesophilic DF had faster H production kinetics, which can be attributed to a faster adaptation of the heat-shocked inoculum used in the tests to the incubation temperature. However, thermophilic AD tests exhibited faster kinetics for methane production.
已研究了从食物废物（FW）在两段式黑暗发酵（DF）和厌氧消化（AD）工艺中生产生物氢气（氢气+甲烷）。本文研究了操作温度（即中温（34°C）和高温（55°C））对生物氢气产量和总能量回收的影响，分别在初始培养 pH5.5 和 pH7 下进行了 DF 和 AD 分批测试。中温 DF 测试的氢气产率较高，为 53.5（4）mL H/g VS 添加，而高温 DF 测试的氢气产率为 37.6（1）mL H/g VS 添加。然而，高温 AD 测试的甲烷产率更高，为 307.5（10）mL CH/g VS，而中温 AD 测试的甲烷产率为 276.5（4.3）mL CH/g VS。与中温（10.4MJ/kg VS）组合工艺相比，高温 DF+AD 的总能量回收更高（11.4MJ/kg VS）。有趣的是，从中温测试的修正 Gompertz 方程确定的动力学参数分析表明，中温 DF 具有更快的 H 生产动力学，这可以归因于用于测试的热冲击接种物对培养温度的更快适应。然而，高温 AD 测试表现出更快的甲烷生产动力学。
