在不同的pH值和微生物群落组成下,城市固体废物的有机分量的发酵
German Dimitriv Jojoa-Unigarro1, Simón González-Martínez2, Yovany Cuetero-Martínez1
1Environmental Engineering Department, Institute of Engineering, National University of Mexico (Universidad Nacional Autónoma de México), Mexico City, 04510, Mexico.
概括
控制有机城市固体废物 (OFMSW) 的储存条件影响发酵. 较低的pH值有利于乙醇和酸,而较高的pH值促进微生物多样性和挥发性脂肪酸 (VFA).
科学领域:
- 生物技术是生物技术.
- 环境科学 环境科学
- 微生物学 微生物学
背景情况:
- 城市固体废物的有机分数 (OFMSW) 在无氧消化之前在储存期间经历自发发酵.
- 这种发酵通过自然存在的微生物产生挥发性脂肪酸 (VFA) 和乙醇.
- 控制化条件对于管理OFMSW发酵和水解至关重要.
研究的目的:
- 为了研究受控pH对OFMSW发酵和水解的影响,仅使用自然存在的微生物.
- 在不同的pH条件下分析VFAs,乙醇和乳酸的产生.
- 了解微生物群落的动态及其在发酵过程中的作用.
主要方法:
- 在半连续反应器中,OFMSW在受控的pH值 (4,5和6) 中发酵了6天.
- 每天采样和分析VFA,乙醇和乳酸度.
- 分析微生物多样性和发酵中的关键参与者.
主要成果:
- 在pH值为4时,乙醇,乳酸和酸是主要产物.
- 在pH 5时,乳酸最初占主导地位,在第4天后下降.
- 在pH值6时,酸迅速形成并稳定;黄油酸达到最高度,微生物多样性随着pH值的增加而增加.
结论:
- 度显著影响了OFMSW的发酵产品和微生物多样性.
- 属Pichia可能负责乙醇生产,而细菌驱动VFA和乳酸生产和乙酸生成.
- 乙生成在乳酸和乙醇随着时间的推移而降解起着关键作用.
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