Enhancing biological hydrogen production through complementary microbial metabolisms

Patel, Sanjay K.S.; Kumar, Prasun; Kalia, Vipin Chandra

doi:10.1016/j.ijhydene.2012.04.045

Cited by 79 publications

(44 citation statements)

References 195 publications

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“…However, it was soon realized that to make the whole process economical, we need to derive other products as well such as H 2 and PHB [1,5]. Efforts to produce H 2 , PHB and methane in different stages from the same feed have been found to be feasible [13,[17][18][19]. Now the issue is to improve the quality of PHB, which is otherwise very brittle in nature.…”

Section: Half Bacterial Biomass With Fresh Gm-2mentioning

confidence: 99%

Production of Polyhydroxyalkanoate Co-polymer by Bacillus thuringiensis

et al. 2012

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Integrative processes for the production of bioenergy and biopolymers are gaining importance in recent years as alternatives to fossil fuels and synthetic plastics. In the present study, Bacillus thuringiensis strain EGU45 has been used to generate hydrogen (H 2 ), polyhydroxybutyrate (PHB) and new co-polymers (NP). Under batch culture conditions with 250 ml synthetic media, B. thuringiensis EGU45 produced up to 0.58 mol H 2 /mol of glucose. Effluent from the H 2 production stage was incubated under shaking conditions leading to the production of PHB up to 95 mg/l along with NP of levulinic acid up to 190 mg/l. A twofold to fourfold enhancement in PHB and up to 1.5 fold increase in NP yields was observed on synthetic medium (mixture of M-9?GM-2 medium in 1:1 ratio) containing at 1-2 % glucose concentration. The novelty of this work lies in developing modified physiological conditions, which induce bacterial culture to produce NP.

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Section: Half Bacterial Biomass With Fresh Gm-2mentioning

confidence: 99%

Production of Polyhydroxyalkanoate Co-polymer by Bacillus thuringiensis

et al. 2012

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“…Biological H 2 production (BHP) process has been widely studied under dark-and photo-fermentative conditions. With these approaches the yields of H 2 have been quite low in comparison to the theoretically achievable values of 4 and 8 mol/mol of glucose under dark and photo-fermentative conditions, respectively [2][3][4][5][6][7]. Quite a few research efforts have been made to overcome the limitations of these processes.…”

Section: Introductionmentioning

confidence: 99%

“…It is possible to convert VFAs to H 2 by photosynthetic bacteria. The potential of exploiting these processes in various combinations have been reviewed to some extent [7][8][9][10]. However a large number of hurdles still seem to persist such as: (i) in the dark-fermentative process-(a) relatively lower H 2 yield (b) the need for strict anaerobic conditions for high H 2 producers, and (c) thermodynamic instability of the process at higher H 2 concentrations, and (ii) during the photo-fermentative process-(a) sensitivity of the H 2 production process to nitrogen content of the feed (b) effect to light intensity and duration of radiation under outdoor (sunlight) and indoor (artificial light sources) conditions, and (c) types of bioreactors required for H 2 production [2,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Integrative Biological Hydrogen Production: An Overview

Patel

Kalia

2012

Indian J Microbiol

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Biological hydrogen (H 2 ) production by dark and photo-fermentative organisms is a promising area of research for generating bioenergy. A large number of organisms have been widely studied for producing H 2 from diverse feeds, both as pure and as mixed cultures. However, their H 2 producing efficiencies have been found to vary (from 3 to 8 mol/mol hexose) with physiological conditions, type of organisms and composition of feed (starchy waste from sweet potato, wheat, cassava and algal biomass). The present review deals with the possibilities of enhancing H 2 production by integrating metabolic pathways of different organisms-dark fermentative bacteria (from cattle dung, activated sludge, Caldicellulosiruptor, Clostridium, Enterobacter, Lactobacillus, and Vibrio) and photo-fermentative bacteria (such as Rhodobacter, Rhodobium and Rhodopseudomonas). The emphasis has been laid on systems which are driven by undefined dark-fermentative cultures in combination with pure photo-fermentative bacterial cultures using biowaste as feed. Such an integrative approach may prove suitable for commercial applications on a large scale.

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“…Approaches to integrate dark and photosynthetic hydrogen production processes are being advocated to break the barrier of 4 mol H 2 /mol hexose sugar [60,61]. Rhodopseudomonas palustris grows well and can produce H 2 on glycerol as feed.…”

Section: Hydrogenmentioning

confidence: 99%

Biorefinery for Glycerol Rich Biodiesel Industry Waste

2016

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The biodiesel industry has the potential to meet the fuel requirements in the future. A few inherent lacunae of this bioprocess are the effluent, which is 10 % of the actual product, and the fact that it is 85 % glycerol along with a few impurities. Biological treatments of wastes have been known as a dependable and economical direction of overseeing them and bring some value added products as well. A novel eco-biotechnological strategy employs metabolically diverse bacteria, which ensures higher reproducibility and economics. In this article, we have opined, which organisms and what bioproducts should be the focus, while exploiting glycerol as feed.

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Enhancing biological hydrogen production through complementary microbial metabolisms

Cited by 79 publications

References 195 publications

Production of Polyhydroxyalkanoate Co-polymer by Bacillus thuringiensis

Production of Polyhydroxyalkanoate Co-polymer by Bacillus thuringiensis

Integrative Biological Hydrogen Production: An Overview

Biorefinery for Glycerol Rich Biodiesel Industry Waste

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