Batch and continuous fermentative production of hydrogen with anaerobic sludge entrapped in a composite polymeric matrix

2007 ◽  
Vol 42 (2) ◽  
pp. 279-284 ◽  
Author(s):  
Ken-Jer Wu ◽  
Jo-Shu Chang
Keyword(s):  
Polymeric Matrix ◽  
Anaerobic Sludge ◽  
Fermentative Production ◽  
Production Of Hydrogen

Sulphate Reduction Control to Enhance Methane Composition in Anaerobic Digester

2015 ◽  
Vol 735 ◽  
pp. 205-209
Author(s):  
Syahrul Syazwan Yaacob ◽  
A. Sabri ◽  
A. Yuzir
Keyword(s):  
Ferric Chloride ◽  
Methane Production ◽  
Sulphate Reduction ◽  
Upflow Anaerobic Sludge Blanket ◽  
Critical Conditions ◽  
Anaerobic Sludge ◽  
Production Of Hydrogen ◽  
High Level ◽  
Anaerobic Sludge Blanket ◽  
Reducing Bacteria

The aim of this research is to investigate addition of iron (ferric chloride) to control of sulphate reduction in order to enhance the methane production under laboratory scale. The bioreactor Upflow Anaerobic Sludge Blanket (UASB) undergoes continuous operation under anaerobic condition treating synthetic sulphate enriched wastewater. The wastewater used as influent wastewater with a total COD 8000 mg.L-1. The experiment was conducted for about 64 days and was operated at constant OLR of 2.0(±0.1) kgCOD.m-3.d-1 by maintaining a hydraulic retention time (HRT) of 4 days. The UASB then were feed with sulphate and give the COD/SO4 ratio 5.3, 2.5 and 1.5. Then amount of ferric chloride at 10.4, 22.2 and 44.5 mM was introduce just after methane producing bacteria (MPB) were completely inhibited by sulphate reducing bacteria (SRB) due to decreasing of methane composition (CH4) and high level production of hydrogen sulphide (H2S). The obtained results showed that the FeCl3 negatively impacted the anaerobic digestion process since with each of COD/SO42- ratio, and the amount addition of ferric chloride to feed regime, gives promotion on methane production, with 67, 70 and 69% after approximately 10 to 15 days operating at critical conditions.

Fermentative production of hydrogen from a wheat flour industry co-product

2008 ◽  
Vol 99 (11) ◽  
pp. 5020-5029 ◽  
Author(s):  
Freda R. Hawkes ◽  
Helen Forsey ◽  
Giuliano C. Premier ◽  
Richard M. Dinsdale ◽  
Dennis L. Hawkes ◽  
...  
Keyword(s):  
Wheat Flour ◽  
Fermentative Production ◽  
Production Of Hydrogen

scholarly journals Direct Fermentative Hydrogen Production from Cellulose and Starch with Mesophilic Bacterial Consortia

2020 ◽  
Vol 69 (1) ◽  
pp. 109-120 ◽  
Author(s):  
ROMAN ZAGRODNIK ◽  
RYSTYNA SEIFERT
Keyword(s):  
Acetic Acid ◽  
Hydrogen Production ◽  
Propionic Acid ◽  
Batch Process ◽  
H2 Production ◽  
Batch Processes ◽  
Anaerobic Sludge ◽  
Efficient Production ◽  
Bacterial Consortia ◽  
Production Of Hydrogen

Hydrogen produced from lignocellulose biomass is deemed as a promising fuel of the future. However, direct cellulose utilization remains an issue due to the low hydrogen yields. In this study, the long-term effect of inoculum (anaerobic sludge) heat pretreatment on hydrogen production from untreated cellulose and starch was evaluated during repeated batch processes. The inoculum pretreatment at 90°C was not sufficient to suppress H2 consuming bacteria, both for starch and cellulose. Although hydrogen was produced, it was rapidly utilized with simultaneous accumulation of acetic and propionic acid. The pretreatment at 100°C (20 min) resulted in the successful enrichment of hydrogen producers on starch. High production of hydrogen (1.2 l H2/lmedium) and H2 yield (1.7 mol H2/molhexose) were maintained for 130 days, with butyric (1.5 g/l) and acetic acid (0.65 g/l) as main byproducts. On the other hand, the process with cellulose showed lower hydrogen production (0.3 l H2/lmedium) with simultaneous high acetic acid (1.4 g/l) and ethanol (1.2 g/l) concentration. Elimination of sulfates from the medium led to the efficient production of hydrogen in the initial cycles – 0.97 mol H2/molhexose (5.93 mmol H2/gcellulose). However, the effectiveness of pretreatment was only temporary for cellulose, because propionic acid accumulation (1.5 g/l) was observed after 25 days, which resulted in lower H2 production. The effective production of hydrogen from cellulose was also maintained for 40 days in a repeated fed-batch process (0.63 mol H2/molhexose).

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.

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