College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
College of Chemical Engineering, Xiangtan University 411105, China.
Sci Total Environ. 2019 Dec 1;694:133741. doi: 10.1016/j.scitotenv.2019.133741. Epub 2019 Aug 5.
Low acid production and acid-forming process instability are becoming the major issues to limit the popularization of anaerobic fermentation to produce volatile fatty acid. Considerable research efforts have been made to address these problems, from studying the microorganisms that are primarily responsible for or detrimental to this process, to determining their biochemical pathways and developing mathematical models that facilitate better prediction of process performance to identify the mechanism and optimization of process control. A limited understanding of the complex microbiology and biochemistry of anaerobic fermentation is the primary cause of acid production upset or failure. This review critically assesses the recent advances in enhanced volatile fatty acid production from anaerobic fermentation of waste activated sludge from micro to macro scale, particularly relating to the microbiology, biochemistry, impact factors, and enhancement methods. Previous results suggest that further studies are necessary to substantially promote the efficiency and stability of acid production. One of the promising directions appears to be integrating the existing and growing pretreatment technologies and fermentation processes to enhance metabolic pathways of acetogens but inhibit activities of methanogens, which this study hopes to partially achieve.
产酸能力低和产酸过程不稳定正成为限制厌氧发酵生产挥发性脂肪酸普及的主要问题。人们已经做出了相当多的努力来解决这些问题，从研究主要负责或不利于这一过程的微生物，到确定它们的生化途径，并开发有助于更好地预测过程性能的数学模型，以确定过程控制的机制和优化。对厌氧发酵复杂微生物学和生物化学的有限了解是产酸失调或失败的主要原因。本综述从微观到宏观尺度上批判性地评估了从厌氧发酵废活性污泥中提高挥发性脂肪酸产量的最新进展，特别是涉及微生物学、生物化学、影响因素和增强方法。先前的结果表明，有必要进一步研究以大幅提高产酸的效率和稳定性。一个有前途的方向似乎是整合现有的和不断发展的预处理技术和发酵工艺，以增强乙酰辅酶 A 途径，但抑制产甲烷菌的活性，本研究希望部分实现这一目标。
