Abstract
Biohydrogen production could be generated from organic wastes: food and beverage processing wastewater, restaurant food waste and raw starch waste. Fermentative hydrogen production from food and beverage processing wastewater by sewage microflora was optimized in terms of pH (4.5–7.0), mesophilic condition (35 ± 2 °C) and thermophilic condition (50 ± 2 °C). Low initial pH (6.5) and mesophilic condition favored hydrogen production (0.28 L/L) indicating that such parameters along with the wastewater characteristics were crucial to dark-fermentative hydrogen production. Pretreatment methods (methanogenic inhibitor, sterilization, sonication and acidification) on restaurant food waste and raw starch waste to enhance biohydrogen production were also investigated in this study. Maximum hydrogen yields of 3.48 and 2.18 ml H2/g COD were observed on sterilization of pretreated restaurant food and raw starch wastes, respectively.
Highlights
The dependence of global energy requirements on fossil fuels may eventually lead to their depletion
Snack wastewater supported maximum cumulative hydrogen production, but it could not be used as the representative substrate because of the discontinuous biohydrogen production
Cumulative hydrogen production in snack wastewater and coconut milk wastewater is higher than that of other wastewaters. It is associated with the high-carbohydrate wastewater and is significantly related to the much of chemical oxygen demand (COD) and biochemical oxygen demand (BOD) values in wastewater [10]
Summary
The dependence of global energy requirements on fossil fuels may eventually lead to their depletion. It is imperative to seek for an alternative energy resource as the main objectives of this study were to look for the impacts of fermentative hydrogen production from food and beverage processing wastewater in terms of initial pH (4.5–7.0), mesophilic (35 ± 2 °C) and thermophilic (50 ± 2 °C) conditions and to investigate the impacts of pretreatment method on organic wastes for enhancing the biohydrogen production. Int J Energy Environ Eng (2014) 5:76 It is imperative to seek for an alternative energy resource as the main objectives of this study were to look for the impacts of fermentative hydrogen production from food and beverage processing wastewater in terms of initial pH (4.5–7.0), mesophilic (35 ± 2 °C) and thermophilic (50 ± 2 °C) conditions and to investigate the impacts of pretreatment method on organic wastes for enhancing the biohydrogen production. 76 Page 2 of 6
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