Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China; Wanjiang University of Technology, Maanshan 243031, China.
Sci Total Environ. 2019 Jun 15;669:540-546. doi: 10.1016/j.scitotenv.2019.03.136. Epub 2019 Mar 11.
The addition of zero-valent iron (ZVI) and ZVI & persulfate (PS) were efficient approaches to enhance the production of volatile fatty acids (VFAs), especially butyric acid, from food wastes (FW) during anaerobic fermentation. The maximal concentration of VFAs was increased from 1256 mg COD/L in the control reactor to 8245 mg COD/L with ZVI addition, and it was further improved to 9800 mg COD/L with the PS/ZVI treatment. An investigation of the mechanisms revealed that both the ZVI and PS/ZVI treatments improved the bioavailable substrates in FW and enhanced the bioconversion efficiency of fermentation substrates, especially proteins and lipids. The provision of a sufficient amount of bioavailable substrates was advantageous to the enrichment of the functional bacteria that are responsible for the production of VFAs. Additionally, the microbial activity and key metabolic enzymes involved in the biological VFAs generation processes were stimulated in the ZVI and PS/ZVI-added reactors, which jointly contributed to high-rate VFAs yields.
添加零价铁 (ZVI) 和 ZVI & 过硫酸盐 (PS) 是提高厌氧发酵中从食物废物 (FW) 中生产挥发性脂肪酸 (VFAs)、特别是丁酸的有效方法。与对照反应器相比，添加 ZVI 使 VFAs 的最大浓度从 1256mg COD/L 增加到 8245mg COD/L，而 PS/ZVI 处理则进一步提高到 9800mg COD/L。机理研究表明，ZVI 和 PS/ZVI 处理均提高了 FW 中的生物可利用底物，并提高了发酵底物的生物转化效率，特别是蛋白质和脂质。提供足够数量的生物可利用底物有利于富集负责生产 VFAs 的功能细菌。此外，ZVI 和 PS/ZVI 添加反应器中的微生物活性和参与生物 VFAs 生成过程的关键代谢酶被刺激，这共同促成了高 VFAs 产量。
