Effect of Hydrogen Peroxide on Hydrogen Production from Melon Fruit (Cucumis melo L.) Waste by Anaerobic Digestion Microbial Community

2021 ◽  
Vol 11 (1) ◽  
pp. 95-101
Author(s):  
Agung Dian Kharisma ◽  
Yumechris Amekan ◽  
Sarto Sarto ◽  
Muhammad Nur Cahyanto
Keyword(s):  
Hydrogen Peroxide ◽  
Anaerobic Digestion ◽  
Hydrogen Production ◽  
Production Rate ◽  
Cost Effective ◽  
H2 Production ◽  
H2o2 Treatment ◽  
H2 Yield ◽  
Cucumis Melo L ◽  
Melon Fruit

Biohydrogen (H2) production has the potential to provide clean, environmentally friendly, and cost-effective energy sources. The effect of increasing oxidative stress on biohydrogen production by acid-treated anaerobic digestion microbial communities was studied. The use of varying amounts of hydrogen peroxide (H2O2; 0.1, 0.2, and 0.4 mM) for enhancing hydrogen production from melon fruit waste was investigated. It was found that H2O2 amendment to the H2-producing mixed culture increased hydrogen production. Treatment with 0.4 mM H2O2 increased cumulative H2 output by 7.7% (954.6 mL/L), whereas treatment with 0.1 mM H2O2 enhanced H2 yield by 23.8% (228.2 mL/gVS) compared to the untreated control. All treatments showed a high H2 production rate when the pH was 4.5 – 7.0.  H2O2-treated samples exhibited greater resilience to pH reduction and maintained their H2 production rate as the system became more acidic during H2 fermentation. The application of H2O2 affected the volatile fatty acid (VFA) profile during biohydrogen fermentation, with an increase in acetic and propionic acid and a reduction in formic acid concentration. The H2O2 treatment positively affects H2 production and is proposed as an alternative way of improving H2 fermentation.

The Performance Characteristics of Anaerobic Baffled Reactor (ABR) Fermentation System

2012 ◽  
Vol 610-613 ◽  
pp. 347-351
Author(s):  
Guo Chen Zheng ◽  
Zhu Jun Tian ◽  
Jian Zheng Li ◽  
Li Wei ◽  
Ajay Kumar Jha ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Activated Sludge ◽  
Production Efficiency ◽  
Oxygen Demand ◽  
H2 Production ◽  
Anaerobic Baffled Reactor ◽  
Steady Stage ◽  
Start Up ◽  
Acid Type ◽  
H2 Yield

A anaerobic baffled reactor (ABR) with an effective volume of 28.7 L was adopted, and the hydrogen production efficiency was investigated with diluted molasses as the substrate. Using a mixture of aerobic and anaerobic activated sludge, the ABR was start-up with a hydraulic retention time (HRT) of 24 h and 35°C. When the influent chemical oxygen demand (COD) concentration was gradually increased from 500 mg/L to 6000 mg/L after a 63-day operation, the ABR kept a steady state. The increase of influent COD concentration, from 6000 mg/L to 8000 mg/L stage by stage, had the remarkable changes on the fermentative system. The ethanol-type fermentation was formed in the first three compartments, while butyric acid-type fermentation in the 4th compartment. In the steady stage at the influent COD of 8000 mg/L, the biogas (H2) yield was found 61.54 L/d (12.85 L/d) while specific H2 production rate of the activated sludge was 48 L/kgMLVSS∙d. Although the ABR system accumulated hydrogen-producing acetogen, due to the hydrogen-consuming bacteria (methanogen and homoacetogenic bacteria), the hydrogen production efficiency was badly inhibited.

Effect of Various Pretreatment Methods of Inoculum on Biohydrogen Production

2010 ◽  
Vol 152-153 ◽  
pp. 902-908
Author(s):  
Yuan Yuan Wang ◽  
Jian Bo Wang ◽  
Cheng Xiao Hu ◽  
Yan Lin Zhang
Keyword(s):  
Production Rate ◽  
H2 Production ◽  
Processing Temperature ◽  
Alkali Pretreatment ◽  
Acid Pretreatment ◽  
Heat Pretreatment ◽  
Mixed Inoculum ◽  
Heat Treated ◽  
Acidic Conditions ◽  
H2 Yield

Influence of different pretreatment methods applied on anaerobic mixed inoculum was evaluated for selectively enriching the hydrogen (H2) producing mixed culture using glucose as substrate. The cumulative H2 yield and H2 production rate were found to be dependent on the type of pretreatment procedure adopted on the parent inoculum. They could be increased by appropriate pretreatment methods, including use of heat, alkaline or acidic conditions. Along with the processing temperature and time of heat pretreatment and alkaline of alkali pretreatment increasing, the H2 yield increased and then declined, but it declined and then increased as the acidity of acid pretreatment increasing. Among the studied pretreatment methods, the heat pretreatment methods procedure enabled higher H2 yield and the maximum H2 production rate, then were alkali and acid pretreatment methods. When the inoculum was heat-treated at 80°C for 30 min, the highest cumulative H2 yield was obtained at 2152.0 mL, which was 53.20% higher than the control, and the maximum H2 production rate was 178.0 mL h-1, which was 122.0% higher than that of the Ctrl (138.0mL h-1).

Effect of Organic Loading Rate on Bio-Hydrogen Production in Continuous Stirred Tank Reactor

2010 ◽  
Vol 113-116 ◽  
pp. 1170-1175
Author(s):  
Zi Rui Guo ◽  
An Ying Jiao ◽  
Xiao Ye Liu ◽  
Yong Feng Li
Keyword(s):  
Hydrogen Production ◽  
Loading Rate ◽  
Clean Energy ◽  
H2 Production ◽  
Organic Loading Rate ◽  
Hydrogen Yield ◽  
Continuous Stirred Tank Reactor ◽  
Organic Loading ◽  
H2 Yield ◽  
Distribution Energy

Hydrogen is a kind of ideal clean energy sources. With low energy consumption, environmental protection and other advantages, biological hydrogen production technology become the hotspot of current study home and abroad. The distribution energy technology for producing hydrogen can get hydrogen when deal with waste water. For finding out the industralized feasibility of continuous H2 bio-production,the ability of H2-production via facultative anaerobe,optimum hydraulic retention time(HRT) and optimum organic loading rate(OLR) were aslo studied. With a temperature of (35±1)°C，HRT of 8 h，the CSTR inoculated with activated sludge ,and the progression is increasing organic loading rate gradually. Six OLRs were examined, ranging from 2 to 12 g COD/L.d, with the mass of molasses ranging from 1.3 to 10 g COD/L. While COD was up to 4g/L(OLR 12kg/(m3•d)), all molasses was utilized and the H2 yield was not significantly influenced by OLR. At the intermediate COD of 6g/l (OLR 18kg/(m3•d)), the H2 yield was maximized at about 30 L/d H2 (mol molasses. Conv.), which was 17.9% and 55.9% higher than those of OLR 6 kg/(m3.d) and OLR 12 kg/(m3.d),respectively. When the influent COD concentration raised to 12g/L(OLR 30kg/(m3•d)), the reactor were overloaded, the hydrogen yield decreased drastically，hydrogen evolution rate decreased to zero. Exceeding OLR would arouse great change of internal environment parameters, such as pH, ALK(aikalinity), ORP(oxidation-reduction potential) in CSTR, and the microbial community structure would change while the metabolism of microorganism was inhibited badly.

Thermodynamic Analysis for Gasification of Thailand Rice Husk with Air, Steam, and Mixed Air/Steam for Hydrogen-Rich Gas Production

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Rajesh Kempegowda ◽  
Suttichai Assabumrungrat ◽  
Navadol Laosiripojana
Keyword(s):  
Hydrogen Production ◽  
Thermodynamic Analysis ◽  
Rice Husk ◽  
Production Efficiency ◽  
H2 Production ◽  
Gas Production ◽  
Steam Gasification ◽  
Production Yield ◽  
H2 Yield ◽  
Increasing Temperature

Thermodynamic analysis of gasification with air, steam, and mixed air-steam was performed over rice husk to determine the optimum conditions (i.e., equivalence ratio (ER), steam to biomass ratio (SBR) and operating temperature) that can maximize the yield of hydrogen production with low energy consumption. It was found that for air gasification, H2 production is always less than CO production and considerably decreased with increasing ER. For steam gasification, the simulation revealed that H2 production is greater than CO, particularly at high SBR and low temperature; furthermore, H2 yield increased steadily with increasing temperature and SBR until reaching SBR of 3.5-4.0, then the effect of steam on H2 yield becomes less pronounced. As for the mixed steam/air gasification, H2 production yield increased with increasing SBR, but decreased dramatically with increasing ER (up to 0.4). Among these three operations, the highest H2 production yield can be achieved from the steam gasification with SBR of 4.0. Nevertheless, by considering the system efficiency, the combined air-steam gasification provided significant higher hydrogen production efficiency than the other two operations. The optimum condition for combined air-steam gasification can be achieved at 900°C with ER of 0.1 and SBR of 2.5, which provided the efficiency up to 66.5 percent.

scholarly journals Διεργασίες ενεργειακής αξιοποίησης γλυκερόλης με παραγωγή βιοαερίου, βιοϋδρογόνου ή/και ηλεκτρικού ρεύματος με μικροβιακή κυψελίδα καυσίμου

2011 ◽  
Author(s):  
Θεόφιλος Βλάσσης
Keyword(s):  
Anaerobic Digestion ◽  
Hydrogen Production ◽  
Electric Current ◽  
Production Rate ◽  
Methane Production ◽  
Continuous Production ◽  
Maximum Yield ◽  
Glycerol Concentration ◽  
Production Of Hydrogen ◽  
Methane Production Rate

This study focused on the valorization of glycerol which is an important by-product of the biodiesel industry corresponding to 10 % of the produced biodiesel amount. This fact contributed to the increase of the global production of biodiesel, to a point at which the industries which traditionally consumed glycerol could not absorb. This situation should be overcome through new outlets on glycerol exploitation. Usually, glycerol is treated by chemical processes in order to form new chemical compounds.On the other side, biochemical processes like anaerobic digestion and fermentation or the technology of microbial fuel cells could potentially transform glycerol into methane, hydrogen and electric current respectively. These processes, which are the subject of this Ph.D, are preferable to their chemical counterparts due to the low energy demand and reduced environmental pollution.The anaerobic digestion process was conducted in a conventional CSTR reactor and in a high rate reactor, the PABR. The experiments dealt with the effect of glycerol concentration on the methane production rate. The obtained results showed that the CSTR could not withstand organic loadings above 0.25 g COD/L/d, however PABR operated at organic loading 10 times higher than CSTR such as 3 g COD/L/d and resulted to a methane production rate of 0.982 ± 0.089 L/L/d. A model was developed for both the CSTR and the PABR digesters. Fermentative hydrogen production was conducted successfully in batch reactors. The effect of the initial glycerol concentration and initial pH on hydrogen production was studied. A maximum yield, 27.3 mL H2/ g COD glycerol, was obtained when glycerol concentration was 8.3 g COD/L and the pH 6.5. Moreover, the fermentation of glycerol took place in a CSTR in order to investigate the continuous production of hydrogen. Hydrogen production was unstable, possibly due to the washout of proper biomass from the reactor.For electricity generation from glycerol, an H-type microbial fuel cell was used in batch mode. The effect of the initial glycerol on the electric current was studied. A maximum Coulombic efficiency (CE) 34.09% was obtained at a glycerol concentration of 3.2 g COD/L. A further increase of glycerol drove to a drop of the CE. Probably, this happened since the electrochemical microorganisms were inhibited by the high glycerol concentration.

Fermentative Hydrogen Production - Process Design and Bioreactors

2012 ◽  
Vol 33 (4) ◽  
pp. 585-594 ◽  
Author(s):  
Małgorzata Waligórska
Keyword(s):  
Production Rate ◽  
Alternative Energy ◽  
Fossil Fuels ◽  
H2 Production ◽  
Factors Affecting ◽  
Fermentative Hydrogen Production ◽  
Production Factors ◽  
Fermentative Hydrogen ◽  
And Performance ◽  
H2 Yield

Substitution of fossil fuels with alternative energy carriers has become necessary due to climate change and fossil fuel shortages. Fermentation as a way of producing biohydrogen, an attractive and environmentally friendly future energy carrier, has captured received increasing attention in recent years because of its high H2 production rate and a variety of readily available waste substrates used in the process. This paper discusses the state-of-the-art of fermentative biohydrogen production, factors affecting this process, as well as various bioreactor configurations and performance parameters, including H2 yield and H2 production rate.

Co-production of hydrogen and methane from herbal medicine wastewater by a combined UASB system with immobilized sludge (H2 production) and UASB system with suspended sludge (CH4 production)

2015 ◽  
Vol 73 (1) ◽  
pp. 130-136 ◽  
Author(s):  
Caiyu Sun ◽  
Ping Hao ◽  
Bida Qin ◽  
Bing Wang ◽  
Xueying Di ◽  
...  
Keyword(s):  
Herbal Medicine ◽  
Hydrogen Production ◽  
Production Rate ◽  
Methane Production ◽  
Oxygen Demand ◽  
H2 Production ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Organic Loading ◽  
Production Of Hydrogen

An upflow anaerobic sludge bed (UASB) system with sludge immobilized on granular activated carbon was developed for fermentative hydrogen production continuously from herbal medicine wastewater at various organic loading rates (8–40 g chemical oxygen demand (COD) L−1 d−1). The maximum hydrogen production rate reached 10.0 (±0.17) mmol L−1 hr−1 at organic loading rate of 24 g COD L−1 d−1, which was 19.9% higher than that of suspended sludge system. The effluents of hydrogen fermentation were used for continuous methane production in the subsequent UASB system. At hydraulic retention time of 15 h, the maximum methane production rate of 5.49 (±0.03) mmol L−1 hr−1 was obtained. The total energy recovery rate by co-production of hydrogen and methane was evaluated to be 7.26 kJ L−1 hr−1.

scholarly journals Immobilization of Iron Minerals on a Layered Silicate for Enhancing its Solar Photocatalytic Activity toward H2 Production

2021 ◽  
Vol 9 ◽  
Author(s):  
Hamza El-Hosainy ◽  
Rafat Tahawy ◽  
Mohamed Esmat ◽  
Maged El-Kemary ◽  
Yusuke Ide
Keyword(s):  
Hydrogen Production ◽  
Formic Acid ◽  
Ferric Iron ◽  
Layered Silicate ◽  
Cost Effective ◽  
H2 Production ◽  
Solar Simulator ◽  
Iron Minerals ◽  
Solar Photocatalytic Activity ◽  
Hydrogen Storage Medium

The development of efficient and cost-effective solar photocatalysts capable of producing hydrogen from formic acid as a hydrogen storage medium is still a challenging issue. Herein, we report that iron minerals, ferric iron hydroxy sulfates (FHS), immobilized on a natural layered silicate, magadiite, can be used as a photocatalyst to produce hydrogen from formic acid under irradiation with solar simulator. The material exhibits the hydrogen production rate of 470 μmol g−1 h−1, which is considerably higher than that obtained on other iron minerals and comparable to that obtained on precious metal-based photocatalyst ever reported. The present result may open a way to design efficient photocatalyst for hydrogen production from formic acid in an economically and environmentally friendly way.

scholarly journals Catalytic Conversion of n-C7 Asphaltenes and Resins II into Hydrogen Using CeO2-Based Nanocatalysts

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1301
Author(s):  
Oscar E. Medina ◽  
Jaime Gallego ◽  
Sócrates Acevedo ◽  
Masoud Riazi ◽  
Raúl Ocampo-Pérez ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Low Temperatures ◽  
Gaseous Mixture ◽  
H2 Production ◽  
The Other ◽  
Hydrogen Release ◽  
Catalytic Gasification ◽  
Three Samples ◽  
Main Decomposition ◽  
Catalytic Capacity

This study focuses on evaluating the volumetric hydrogen content in the gaseous mixture released from the steam catalytic gasification of n-C7 asphaltenes and resins II at low temperatures (<230 °C). For this purpose, four nanocatalysts were selected: CeO2, CeO2 functionalized with Ni-Pd, Fe-Pd, and Co-Pd. The catalytic capacity was measured by non-isothermal (from 100 to 600 °C) and isothermal (220 °C) thermogravimetric analyses. The samples show the main decomposition peak between 200 and 230 °C for bi-elemental nanocatalysts and 300 °C for the CeO2 support, leading to reductions up to 50% in comparison with the samples in the absence of nanoparticles. At 220 °C, the conversion of both fractions increases in the order CeO2 < Fe-Pd < Co-Pd < Ni-Pd. Hydrogen release was quantified for the isothermal tests. The hydrogen production agrees with each material’s catalytic activity for decomposing both fractions at the evaluated conditions. CeNi1Pd1 showed the highest performance among the other three samples and led to the highest hydrogen production in the effluent gas with values of ~44 vol%. When the samples were heated at higher temperatures (i.e., 230 °C), H2 production increased up to 55 vol% during catalyzed n-C7 asphaltene and resin conversion, indicating an increase of up to 70% in comparison with the non-catalyzed systems at the same temperature conditions.

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