A two-stage process for hydrogen production from cheese whey: Integration of dark fermentation and biocatalyzed electrolysis

2015 ◽  
Vol 40 (1) ◽  
pp. 168-175 ◽  
Author(s):  
R. Moreno ◽  
A. Escapa ◽  
J. Cara ◽  
B. Carracedo ◽  
X. Gómez
Keyword(s):  
Hydrogen Production ◽  
Cheese Whey ◽  
Dark Fermentation ◽  
Two Stage ◽  
Stage Process ◽  
Biocatalyzed Electrolysis

BioH2 production from waste bread using a two-stage process of enzymatic hydrolysis and dark fermentation

2017 ◽  
Vol 42 (50) ◽  
pp. 29929-29934 ◽  
Author(s):  
Wei Han ◽  
Wen-Xin Liu ◽  
Cai-Meng Yu ◽  
Jin-Gang Huang ◽  
Jung-Hong Tang ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Dark Fermentation ◽  
Two Stage ◽  
Stage Process

Continuous hydrogen and methane production in a two-stage cheese whey fermentation system

2011 ◽  
Vol 64 (2) ◽  
pp. 367-374 ◽  
Author(s):  
C. B. Cota-Navarro ◽  
J. Carrillo-Reyes ◽  
G. Davila-Vazquez ◽  
F. Alatriste-Mondragón ◽  
E. Razo-Flores
Keyword(s):  
Methane Production ◽  
Cheese Whey ◽  
Continuous Production ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Stable Operation ◽  
Operational Parameters ◽  
Two Stage ◽  
Production Of Hydrogen ◽  
Stage Process

The feasibility of integrating biological hydrogen and methane production in a two-stage process using mixed cultures and cheese whey powder (CWP) as substrate was studied. The effect of operational parameters such as hydraulic retention time (HRT) and organic loading rate (OLR) on the volumetric hydrogen (VHPR) and methane (VMPR) production rates was assessed. The highest VHPR was 28 L H2/L/d, obtained during stable operation in a CSTR at HRT and OLR of 6 h and 142 g lactose/L/d, respectively. Moreover, hydrogen (13 L/L/d) was produced even at HRT as low as 3.5 h and OLR of 163 g lactose/L/d, nonetheless, the reactor operation was not stable. Regarding methane production in an UASB reactor, the acidified effluent from the hydrogen-producing bioreactor was efficiently treated obtaining COD removals above 90% at OLR and HRT of 20 g COD/L/d and 6 h, respectively. The two-stage process for continuous production of hydrogen and methane recovered over 70% of the energy present in the substrate. This study demonstrated that hydrogen production can be efficiently coupled to methane production in a two-stage system and that CWP is an adequate substrate for energy production.

Reactor start-up strategy as key for high and stable hydrogen production from cheese whey thermophilic dark fermentation

2021 ◽  
Author(s):  
Giovanna Lovato ◽  
Isabela Mehi Gaspari Augusto ◽  
Antônio Djalma Nunes Ferraz Júnior ◽  
Roberta Albanez ◽  
Suzana Maria Ratusznei ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Cheese Whey ◽  
Dark Fermentation ◽  
Start Up

scholarly journals Improvement of Digestate Stability Using Dark Fermentation and Anaerobic Digestion Processes

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3552 ◽  
Author(s):  
Elena Albini ◽  
Isabella Pecorini ◽  
Giovanni Ferrara
Keyword(s):  
Anaerobic Digestion ◽  
Pilot Scale ◽  
Dark Fermentation ◽  
Second Phase ◽  
Reference Scenario ◽  
Biological Stability ◽  
Two Stage ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Stage Process

This paper assessed the effect of dark fermentation, the fermentative phase in a two-stage anaerobic digestion system, in terms of digestate biostabilization efficiency. The digestates analyzed in this study were obtained from a pilot-scale system in which two different substrates were used in order to simulate both the digestion and co-digestion process. Biostabilization performances were evaluated by measuring the specific oxygen uptake rate (SOUR) of the outgoing digestates. This index allowed us to define the degree of effectiveness in terms of stabilization of organic matter, between the traditional anaerobic digestion process and the two-stage configuration. Considering the traditional process as a reference scenario, the results highlighted an increase in biological stability for the two-stage co-digestion process, consisting of a dark fermentation stage, followed by an anaerobic digestion one. Digestates biostabilization efficiency increased up from 6.5% to 40.6% from the traditional one-stage configuration to the two-stage one by improving the anaerobic digestion process through a preliminary fermentative stage. The advantages of the two-stage process were due to the role of dark fermentation as a biological pre-treatment. Considering the partial stability results related to the second stage, biological stability was improved in comparison to a single-stage process, reaching an efficiency of 42.2% and 55.8% for the digestion and co-digestion scenario respectively. The dark fermentation phase allowed for a higher hydrolysis of the substrate, making it more easily degradable in the second phase. Results demonstrated better biostabilization performances of the outgoing digestates with the introduction of dark fermentation, resulting in more stable digestates for both the digestion and co-digestion process.

Continuous hydrogen production from cassava starch processing wastewater by two-stage thermophilic dark fermentation and microbial electrolysis

2017 ◽  
Vol 42 (45) ◽  
pp. 27584-27592 ◽  
Author(s):  
Peerawat Khongkliang ◽  
Prawit Kongjan ◽  
Bussakorn Utarapichat ◽  
Alissara Reungsang ◽  
Sompong O-Thong
Keyword(s):  
Hydrogen Production ◽  
Cassava Starch ◽  
Dark Fermentation ◽  
Two Stage ◽  
Microbial Electrolysis

scholarly journals Dark Fermentation of Sweet Sorghum Stalks, Cheese Whey and Cow Manure Mixture: Effect of pH, Pretreatment and Organic Load

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1017
Author(s):  
Margarita Andreas Dareioti ◽  
Aikaterini Ioannis Vavouraki ◽  
Konstantina Tsigkou ◽  
Constantina Zafiri ◽  
Michael Kornaros
Keyword(s):  
Fatty Acids ◽  
Hydrogen Production ◽  
Sweet Sorghum ◽  
Volatile Fatty Acids ◽  
Cheese Whey ◽  
Dark Fermentation ◽  
Organic Load ◽  
Anaerobic Sludge ◽  
Hydrogen Yield ◽  
Cow Manure

The aim of this study was to determine the optimal conditions for dark fermentation using agro-industrial liquid wastewaters mixed with sweet sorghum stalks (i.e., 55% sorghum, 40% cheese whey, and 5% liquid cow manure). Batch experiments were performed to investigate the effect of controlled pH (5.0, 5.5, 6.0, 6.5) on the production of bio-hydrogen and volatile fatty acids. According to the obtained results, the maximum hydrogen yield of 0.52 mol H2/mol eq. glucose was measured at pH 5.5 accompanied by the highest volatile fatty acids production, whereas similar hydrogen productivity was also observed at pH 6.0 and 6.5. The use of heat-treated anaerobic sludge as inoculum had a positive impact on bio-hydrogen production, exhibiting an increased yield of 1.09 mol H2/mol eq. glucose. On the other hand, the pretreated (ensiled) sorghum, instead of a fresh one, led to a lower hydrogen production, while the organic load decrease did not affect the process performance. In all experiments, the main fermentation end-products were volatile fatty acids (i.e., acetic, propionic, butyric), ethanol and lactic acid.

scholarly journals Coproduction of hydrogen and methane in a CSTR-IC two-stage anaerobic digestion system from molasses wastewater

2019 ◽  
Vol 79 (2) ◽  
pp. 270-277 ◽  
Author(s):  
Qiaoyan Li ◽  
Yongfeng Li
Keyword(s):  
Hydrogen Production ◽  
Production Rate ◽  
Methane Production ◽  
Oxygen Demand ◽  
Organic Loading Rate ◽  
Continuous Stirred Tank Reactor ◽  
Two Stage ◽  
Molasses Wastewater ◽  
Methane Production Rate ◽  
Stage Process

Abstract A continuous hydrogen and methane production system in a two-stage process has been investigated to increase energy recovery rate from molasses wastewater in this study. This system consisted of a continuous stirred-tank reactor for hydrogen production and an internal circulation (IC) reactor for methane production, and was studied under the influent organic loading rate (OLR) of 18, 24, 30 and 36kg COD/(m3·d) (COD: chemical oxygen demand). The maximum volumetric hydrogen production rate of 2.41 L/(L·d) was obtained at the OLR of 30kg COD/(m3·d) with a hydrogen content of 42%, and the maximum volumetric methane production rate of 2.4 L/(L·d) with a methane content of 74.45% was obtained at the OLR of 36kg COD/(m3·d) using the effluents of hydrogen fermentation as substrate. The maximum of 71.06% of the molasses wastewater energy was converted to biogas (hydrogen and methane) at the OLR of 30kg COD/(m3·d).

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