A novel recycling process using the treated citric acid wastewater as ingredients water for citric acid production |
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Affiliation: | 1. Department of Chemical and Biochemical Engineering, Technical University of Denmark, Søltofts Plads, DK-2800 Kgs. Lyngby, Denmark;2. PSE for SPEED, Skyttemosen 6, DK-3450 Allerod, Denmark;1. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, Hubei, China;2. School of Resource and Environmental Engineering, Hubei University of Technology, Wuhan 430068, Hubei, China;3. Blue Minerals Consultancy, Wattle Grove, Tasmania 7109, Australia |
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Abstract: | In this study, an integrated process coupling citric acid and methane fermentations was proposed to solve severe wastewater pollution problem in cassava-based citric acid production. The accumulation patterns of the potential and major inhibitors in this process, including organic compounds, volatile fatty acids (VFAs), total ions and pigments were investigated. Both simulation and experimental results indicated that these inhibitors could reach their equilibrium levels after 3–7 fermentation runs when reutilizing the treated citric acid wastewater. As a result, the proposed citric acid fermentation process by recycling the wastewater treated in methane fermentation could be stably operated for more than 15 runs, which could save a large amount of fresh water and relieve the severe wastewater pollution in citric acid production potentially. |
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Keywords: | Anaerobic processes Citric acid Process integration Recycling Waste-water treatment |
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