Department of Advanced Energy Engineering, Chosun University, Gwangju 61457, Republic of Korea.
Department of Environmental Engineering, Chosun University, Gwangju 61457, Republic of Korea.
Bioresour Technol. 2023 Aug;382:129208. doi: 10.1016/j.biortech.2023.129208. Epub 2023 May 20.
Anaerobic co-digestion of food waste and algae was assessed to offset the drawbacks of anaerobic mono-digestion of each substrate. Batch test results indicated that a food waste and algae mixture ratio of 8:2 facilitated the highest CH yield (334 mL CH/g COD). This ratio was applied to the anaerobic co-digestion reactor, resulting in a CH yield that was twice that of the anaerobic mono-digestion reactors, thereby facilitating high operational stability. In contrast to the anaerobic mono-digestion, anaerobic co-digestion resulted in stable CH production by overcoming volatile fatty acid accumulation and a decreased pH, even under a high organic loading rate (3 kg COD/m∙d). Furthermore, a comparative metagenomic analysis revealed that the abundance of volatile fatty acid-oxidizing bacteria and hydrogenotrophic and methylotrophic methanogens was significantly increased in the anaerobic co-digestion reactor. These findings indicate that the anaerobic co-digestion of food waste and algae significantly improves CH production and process stability.
采用厌氧共消化技术来处理食物垃圾和藻类，以弥补单一处理这两种底物的不足。批式实验结果表明，当食物垃圾和藻类的混合比例为 8:2 时，产甲烷量（CH 产量）最高（334 mL CH/g COD）。该比例应用于厌氧共消化反应器中，使 CH 产量是厌氧单消化反应器的两倍，从而实现了高操作稳定性。与厌氧单消化相比，厌氧共消化通过克服挥发性脂肪酸（volatile fatty acid, VFA）积累和 pH 值降低，即使在高有机负荷率（3 kg COD/m·d）下，也能稳定地产生 CH。此外，比较宏基因组分析表明，在厌氧共消化反应器中，挥发性脂肪酸氧化菌（volatile fatty acid-oxidizing bacteria）和氢营养型产甲烷菌（hydrogenotrophic methanogens）以及甲基营养型产甲烷菌（methylotrophic methanogens）的丰度显著增加。这些发现表明，食物垃圾和藻类的厌氧共消化显著提高了 CH 产量和工艺稳定性。
