Anaerobic caproate production on carbon chain elongation: Effect of lactate/butyrate ratio, concentration and operation mode
| Autor: | Lu Li, Jingwei Ma, Shuizhou Ke, Peng Xu, Shanbiao Xie, Zhou Shi, Qiulai He |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Environmental Engineering Bioengineering Butyrate 010501 environmental sciences 01 natural sciences Operation mode 010608 biotechnology Anaerobiosis Lactic Acid Caproates Waste Management and Disposal 0105 earth and related environmental sciences Carbon chain chemistry.chemical_classification Renewable Energy Sustainability and the Environment Chemistry General Medicine Carbon Butyrates Fermentation Propionate Electron efficiency Acrylate pathway Elongation Anaerobic exercise Nuclear chemistry |
| Zdroj: | Bioresource Technology. 329:124893 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2021.124893 |
| Popis: | The objective of this study was to understand how lactate-to-butyrate ratio and substrates concentrations affect the caproate production and product structure. The results showed that a higher butyrate-to-lactate ratio is beneficial to caproate production at low initial lactate concentration. Low pH (5.0) and low substrate concentration (20 mM and 40 mM) effectively decreased propionate production via restrained acrylate pathway, resulting in higher electron efficiency of caproate. With the optimum mole ratio of lactate to butyrate (1:4) and 80 mM initial butyrate concentration, the electron efficiency of caproate reached the maximum (43.10%). Moreover, high butyrate concentration suppressed the production of odd-carbon-number carboxylates while promoting the production of caproate. Compared with the batch operation, the caproate production in semi-continuous operation was enhanced by 3.45 times to 30.91 ± 1.07 mM as the acrylate pathway was successfully inhibited in semi-continuous experiments due to low pH and low lactate concentration. |
| Databáze: | OpenAIRE |
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