Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA.
Plant & Soil Sciences Department, University of Delaware, Newark, DE 19713, USA.
Bioresour Technol. 2021 Apr;326:124730. doi: 10.1016/j.biortech.2021.124730. Epub 2021 Jan 27.
Hydrothermal liquefaction is a promising method to convert municipal sludge into an energy-dense fuel. The inevitable by-product aqueous phase is rich in complex organics, which has the potential for energy and nutrient recovery and can be treated by anaerobic digestion to produce methane. However, toxic compounds such as ammonia and phenolics present would inhibit the function of micro-organisms. This study investigated the influence of ammonia and phenolics removal on anaerobic digestion. The results showed that the treated aqueous phase resulted in up to 225 ml CH/g COD. The highest methane production was obtained in the culture with both ammonia and phenolics removal at pH 7.0, which was about 90% higher than only ammonia removal and seven times higher than only phenolics removal. The microbial community analysis results showed that these two treatments could increase microbial diversity and upregulate the relative abundance of methanogens.
水热液化是一种将城市污泥转化为高能量密度燃料的有前途的方法。不可避免的副产物水相富含复杂有机物，具有能源和营养回收的潜力，可以通过厌氧消化处理来生产甲烷。然而，存在的氨和酚类等有毒化合物会抑制微生物的功能。本研究探讨了氨和酚类去除对厌氧消化的影响。结果表明，处理后的水相产生了高达 225ml CH/g COD 的甲烷。在氨和酚类去除的条件下，在 pH 值为 7.0 时，甲烷的产量最高，比仅去除氨时提高了约 90%，比仅去除酚类时提高了 7 倍。微生物群落分析结果表明，这两种处理方法可以增加微生物多样性，并上调产甲烷菌的相对丰度。
