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Open AccessArticle

Enhanced Anaerobic Mixed Culture Fermentation with Anion-Exchange Resin for Caproate Production

Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215011, China
Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi 214122, China
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Authors to whom correspondence should be addressed.
Processes 2019, 7(7), 404;
Received: 15 May 2019 / Revised: 20 June 2019 / Accepted: 20 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue Processes for Bioenergy and Resources Recovery from Biowaste)
The bioproduction of caproate from organic waste by anaerobic mixed culture is a very attractive technology for upgrading low-grade biomass to a high-value resource. However, the caproate production process is markedly restricted by the feedback inhibition of caproate. In this study, four types of anion-exchange resin were investigated for their enhancing capability in caproate fermentation of anaerobic mixed culture. The strong base anion-exchange resin D201 showed the highest adsorption capacity (62 mg/g), selectivity (7.50), and desorption efficiency (88.2%) for caproate among the test resins. Subsequently, the optimal desorption temperature and NaOH concentration of eluent for D201 were determined. The adsorption and desorption efficiency of D201 remained stable during eight rounds of the adsorption–desorption cycle, indicating a satisfactory reusability of D201. Finally, performances of caproate fermentation with and without resin adsorption for carboxylate were evaluated. The results demonstrated that the final concentration of caproate was improved from 12.43 ± 0.29 g/L (without adsorption) to 17.30 ± 0.13 g/L (with adsorption) and the maximum caproate production rate was improved from 0.60 ± 0.01 g/L/d to 2.03 ± 0.02 g/L/d. In the group with adsorption, the cumulative caproate production was increased to 29.10 ± 0.33 g/L broth, which was 134% higher than that of the control group. Therefore, this study provides effective approaches to enhance caproate production. View Full-Text
Keywords: anaerobic mixed culture; caproate fermentation; adsorption process; enhanced performance anaerobic mixed culture; caproate fermentation; adsorption process; enhanced performance
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Yu, J.; Liao, J.; Huang, Z.; Wu, P.; Zhao, M.; Liu, C.; Ruan, W. Enhanced Anaerobic Mixed Culture Fermentation with Anion-Exchange Resin for Caproate Production. Processes 2019, 7, 404.

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