Co-digestion of food waste and sludge for hydrogen production by anaerobic mixed cultures: Statistical key factors optimization

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• 作者：Chakkrit  ; Sreela-or^a ; Pensri  ; Plangklang^a ; Tsuyoshi  ; Imai^b ; Alissara  ; Reungsang^a ;   ; ^c ;   ; ^{alissara@kku.ac.th}
• 关键词：Bio-hydrogen ; Co-digestion ; Food waste ; Sludge ; Response surface methodology ; Optimization
• 刊名：International Journal of Hydrogen Energy
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：36
• 期：21
• 页码：14227-14237
• 全文大小：1426 K

文摘

Factors affecting hydrogen production from the co-digestion of food waste and sludge in batch fermentation by anaerobic mixed cultures were optimized using Response Surface Methodology with Central Composite Design. Investigated parameters included C/N ratio, inoculums concentration, Na₂HPO₄ concentration and Endo nutrient addition. The experiments were conducted in 120 mL serum bottles with a working volume of 70 mL. Results revealed that the optimum conditions were a C/N ratio of 33.14, inoculums concentration of 2.70 g-VSS/L, Na₂HPO₄ concentration of 6.27 g/L and Endo nutrient addition of 7.51 mL/L. Under the optimal conditions, a maximum hydrogen yield (HY) of 102.63 mL H₂/g-VS_added and specific hydrogen production rate (SHPR) of 59.62 mL H₂/g-VSS h were obtained. C/N ratio and inoculums concentration showed the greatest individual and interactive effects on HY and SHPR (P < 0.05). Endo nutrient addition also had an individual effect on SHPR (P = 0.0124). The confirmation experiment under optimal condition showed an HY and SHPR of 101.14 mL H₂/g-VS_added and 59.43 mL H₂/g-VSS h, respectively. This was only 1.01 % and 1.00 % , respectively, different from the predicted values.