Biological hydrogen promotion via integrated fermentation of complex agro-industrial wastes

Mohamed Soltan, Mohamed Elsamadony and Ahmed Tawfik

Applied Energy, 2017, vol. 185, issue P1, 929-938

Abstract: The presence of phenolic compounds and/or metals in mixed fruit peels (MFPs) and paper mill sludge (PMS) yielded hydrogen production values of 121.6±9.2 and 163.5±13.4mL, respectively. MFPs contained total phenolic compound concentrations of 2.43±0.11mgGAU/g, which reduced anaerobic activity. However, the integration of MFPs (30%) into PMS (70%) mitigated the inhibition of hydrogen production and resulted in a 3.01 and 2.24 increase in hydrogen generation compared to the separate fermentation of MFPs and PMS, respectively. Moreover, integrated fermentation of 30% MFPs and 70% PMS synergistically balanced the concentrations of trace metals in terms of calcium, iron, magnesium, manganese, nickel, zinc, sodium, potassium and cobalt at 2016.1±119.3, 473.0±42.6, 243.3±21.7, 23.0±2.7, 14.2±1.3, 109.6±7.5, 113.9±9.1, 888.2±102.4 and 1.2±0.1mg/kg, respectively. Total ammonia nitrogen and alkalinity values were augmented up to 539.20±28.02mg/L and 5.23±0.73gCaCO3/L, respectively, at 70% PMS, which resulted in a limited pH drop of 1.31±0.41. Furthermore, the 30/70MFP/PMS substance yielded a net energy profit of 32.2±4.2kJ/kgfeedstock. This value corresponded to a payback period of 2.6years compared to 11.5 and 5.4years for the separate fermentation of MFPs and PMS, respectively.

Keywords: Hydrogen; Mixed fruit peels; Paper mill sludge; Trace metals; Phenolic compounds (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (4)

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DOI: 10.1016/j.apenergy.2016.10.002

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