Direct integration of CSTR-UASB reactors for two-stage hydrogen and methane production from sugarcane syrup

Nualsri, Chatchawin; Kongjan, Prawit; Reungsang, Alissara

doi:10.1016/j.ijhydene.2016.07.135

Cited by 69 publications

(19 citation statements)

References 45 publications

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“…The maximum energy yield (11.9 kJ/g-VS added ) obtained at the optimum OLR of 1.5 g-VS/L•d was lower than that reported in the studies of Prapinagsorn et al [22], González et al [23] and Silva et al [24]. However, it was higher than reported by Arreola-Vargas et al [26], Nualsri et al [27] and Prapinagsorn et al [6] (Table 4). The discrepancies might also have been due to variations in substrate types, concentrations, inoculum types and fermentation modes.…”

Section: Energy Production and A Comparison With The Literature Valuesmentioning

confidence: 52%

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Co-Digestion of Napier Grass with Food Waste and Napier Silage with Food Waste for Methane Production

2018

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Enhancement of methane production by co-digestion of Napier grass and Napier silage with food waste was investigated in batch and repeated batch modes. First, the ratios of Napier grass to food waste and Napier silage to food waste were varied at different g-volatile solids (VS) to g-VS at an initial substrate concentration of 5 g-VS/L. The optimum ratios of Napier grass to food waste and Napier silage to food waste were 1:4 and 3:2 (g-VS/g-VS), respectively. This gave maximum methane yields (MY) of 411 and 362 mL-CH4/g-VSadded, respectively. Subsequently, the suitable ratios were used to produce methane at various substrate concentrations. A maximal MY of 403 and 353 mL CH4/g-VS were attained when concentrations of Napier grass co-digested with food waste and Napier silage co-digested with food waste were 15 g-VS/L and 20 g-VS/L, respectively. Under the optimum substrate concentration, the maximum MY from co-digestion of Napier grass with food waste was 1.14 times higher than that of Napier silage with food waste. Thus, co-digestion of Napier grass with food waste was further investigated at various organic loading rates (OLRs) in a 10.25 L horizontal reactor with a working volume of 5 L at an optimal ratio of 1:4 (g-VS/g-VS) and substrate concentration of 15 g VS/L. An OLR of 1.5 g-VS/L∙d gave a maximum methane production rate and MY of 0.5 L CH4/L∙d and 0.33 L-CH4/g-VSadded, respectively. Under the optimum OLR, the predominant methane producers were Methanoregula sp., Methanotorris sp., Methanobacterium sp., Methanogenium sp. and Methanosarcina sp. An energy production of 11.9 kJ/g-VSadded was attained.

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Section: Energy Production and A Comparison With The Literature Valuesmentioning

confidence: 52%

“…Methanoregula sp. is the primary mesophilic archaea (30-35 • C) found in granular sludge [6,27]. Methanoregula sp., Methanotorris sp.…”

Section: Energy Production and A Comparison With The Literature Valuesmentioning

confidence: 99%

Co-Digestion of Napier Grass with Food Waste and Napier Silage with Food Waste for Methane Production

2018

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“…where H(t) is the HY at time t (mL g-VS −1 ), H max is the maximum HY (mL g-VS −1 ), HPR is the maximum hydrogen production rate (mL g-VS −1 h −1 ), λ is the lag time (h), and e is Euler's number, i.e., 2.71828 [42]. Volatile fatty acid (VFA) concentrations were determined following the method of Nualsri et al [43]. Reducing sugar concentrations were determined using the dinitrosalicylic acid (DNS) method [44], with glucose as the standard.…”

Section: Methodsmentioning

confidence: 99%

Enhancing Hydrogen Production from Chlorella sp. Biomass by Pre-Hydrolysis with Simultaneous Saccharification and Fermentation (PSSF)

et al. 2019

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Simultaneous saccharification and fermentation (SSF) and pre-hydrolysis with SSF (PSSF) were used to produce hydrogen from the biomass of Chlorella sp. SSF was conducted using an enzyme mixture consisting of 80 filter paper unit (FPU) g-biomass−1 of cellulase, 92 U g-biomass−1 of amylase, and 120 U g-biomass−1 of glucoamylase at 35 °C for 108 h. This yielded 170 mL-H2 g-volatile-solids−1 (VS), with a productivity of 1.6 mL-H2 g-VS−1 h−1. Pre-hydrolyzing the biomass at 50 °C for 12 h resulted in the production of 1.8 g/L of reducing sugars, leading to a hydrogen yield (HY) of 172 mL-H2 g-VS−1. Using PSSF, the fermentation time was shortened by 36 h in which a productivity of 2.4 mL-H2 g-VS−1 h−1 was attained. To the best of our knowledge, the present study is the first report on the use of SSF and PSSF for hydrogen production from microalgal biomass, and the HY obtained in the study is by far the highest yield reported. Our results indicate that PSSF is a promising process for hydrogen production from microalgal biomass.

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“…The CSTR and UASB reactors were directly integrated without buffer tank [ 15 ]. The sugarcane syrup at 25 g COD/L was fed into the CSTR to produce hydrogen.…”

Section: Methodsmentioning

confidence: 99%

“…For energy production rate (EPR) calculation, HPR and MPR from two-stage fermentation process in L/L.d units were converted to EPR in units of kJ/L.d by multiplying HPR or MPR with an energy content of 10.8 kJ/L (STP) for hydrogen (equivalent to 121 kJ/g H 2 ) or 36 kJ/L (STP) for methane (equivalent to 50 kJ/g CH 4 ) [ 15 ].…”

Section: Methodsmentioning

confidence: 99%

Effect of biogas sparging on the performance of bio-hydrogen reactor over a long-term operation

et al. 2017

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This study aimed to enhance hydrogen production from sugarcane syrup by biogas sparging. Two-stage continuous stirred tank reactor (CSTR) and upflow anaerobic sludge blanket (UASB) reactor were used to produce hydrogen and methane, respectively. Biogas produced from the UASB was used to sparge into the CSTR. Results indicated that sparging with biogas increased the hydrogen production rate (HPR) by 35% (from 17.1 to 23.1 L/L.d) resulted from a reduction in the hydrogen partial pressure. A fluctuation of HPR was observed during a long term monitoring because CO2 in the sparging gas and carbon source in the feedstock were consumed by Enterobacter sp. to produce succinic acid without hydrogen production. Mixed gas released from the CSTR after the sparging can be considered as bio-hythane (H2+CH4). In addition, a continuous sparging biogas into CSTR release a partial pressure in the headspace of the methane reactor. In consequent, the methane production rate is increased.

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Direct integration of CSTR-UASB reactors for two-stage hydrogen and methane production from sugarcane syrup

Cited by 69 publications

References 45 publications

Co-Digestion of Napier Grass with Food Waste and Napier Silage with Food Waste for Methane Production

Co-Digestion of Napier Grass with Food Waste and Napier Silage with Food Waste for Methane Production

Enhancing Hydrogen Production from Chlorella sp. Biomass by Pre-Hydrolysis with Simultaneous Saccharification and Fermentation (PSSF)

Effect of biogas sparging on the performance of bio-hydrogen reactor over a long-term operation

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