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Optimization of fermentative biohydrogen production by response surface methodology using fresh leachate as nutrient supplement
Authors:Liu Qiang  Zhang Xiaolei  Zhou Yinmei  Zhao Aihua  Chen Shanping  Qian Guangren  Xu Zhi Ping
Institution:a School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Road, Shanghai 200444, PR China
b Shanghai Engineering Research Center of Municipal Solid Waste Treatment and Recycle, No. 345 Shilong Road, Shanghai 200232, PR China
c ARC Centre of Excellence for Functional Nanomaterials, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
Abstract:Fresh compost leachate was used as a nutrients source to facilitate anaerobic fermentative hydrogen production from glucose inoculated with mixed culture. The optimum condition for hydrogen production was predicted by response surface methodology (RSM). The model showed the maximum cumulative hydrogen volume (469.74 mL) and molar hydrogen yield (1.60 mol H2/mol glucose) could be achieved at 6174.93 mg/L glucose and 3383.20 mg COD/L leachate. According to the predicted optimal condition, four tests were carried out to validate the predicted values and evaluate the leachate’s effect on co-fermentation with juice wastewater. A maximum cumulative hydrogen volume of 587.05 ± 15.08 mL was obtained in co-fermentation test, and the molar hydrogen yield reached 2.06 ± 0.06 mol H2/mol glucose. The co-fermentation of fresh leachate and glucose/juice wastewater was a combination of acetic acid and butyric acid type-fermentation. The results demonstrated that leachate can serve as a nutrients source for biohydrogen production.
Keywords:Biohydrogen production  Fresh leachate  Nutrients source  Response surface methodology  Volatile fatty acid
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