Techno-economic comparison of a biological hydrogen process and a 2nd generation ethanol process using barley straw as feedstock

Ljunggren, Magnus; Wallberg, Ola; Zacchi, Guido

doi:10.1016/j.biortech.2011.06.096

Cited by 59 publications

(19 citation statements)

References 30 publications

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“…20 mmol · L −1 · h −1 , Case E) than most of the previously obtained values in continuous cultures of Caldicellulosiruptor species [28], but which is still about an order of magnitude lower than the maximum Q H2 ever reported for thermophilic hydrogen producers [20]. Nevertheless, the highest maximum Q H2 in both these studies were obtained at very high d (>1.0 h −1 ), which may not be ideal for reasonable process economics [27]. Thus, further investigations are needed to determine the implications of high d (h −1 ) on a biohydrogen process.…”

Section: Discussionmentioning

confidence: 67%

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Biofilm formation by designed co-cultures of Caldicellulosiruptor species as a means to improve hydrogen productivity

Pawar

Vongkumpeang

Grey

et al. 2015

Biotechnol Biofuels

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BackgroundCaldicellulosiruptor species have gained a reputation as being among the best microorganisms to produce hydrogen (H2) due to possession of a combination of appropriate features. However, due to their low volumetric H2 productivities (QH2), Caldicellulosiruptor species cannot be considered for any viable biohydrogen production process yet. In this study, we evaluate biofilm forming potential of pure and co-cultures of Caldicellulosiruptor saccharolyticus and Caldicellulosiruptor owensensis in continuously stirred tank reactors (CSTR) and up-flow anaerobic (UA) reactors. We also evaluate biofilms as a means to retain biomass in the reactor and its influence on QH2. Moreover, we explore the factors influencing the formation of biofilm.ResultsCo-cultures of C. saccharolyticus and C. owensensis form substantially more biofilm than formed by C. owensensis alone. Biofilms improved substrate conversion in both of the reactor systems, but improved the QH2 only in the UA reactor. When grown in the presence of each other’s culture supernatant, both C. saccharolyticus and C. owensensis were positively influenced on their individual growth and H2 production. Unlike the CSTR, UA reactors allowed retention of C. saccharolyticus and C. owensensis when subjected to very high substrate loading rates. In the UA reactor, maximum QH2 (approximately 20 mmol · L−1 · h−1) was obtained only with granular sludge as the carrier material. In the CSTR, stirring negatively affected biofilm formation. Whereas, a clear correlation was observed between elevated (>40 μM) intracellular levels of the secondary messenger bis-(3′-5′)-cyclic dimeric guanosine monophosphate (c-di-GMP) and biofilm formation.ConclusionsIn co-cultures C. saccharolyticus fortified the trade of biofilm formation by C. owensensis, which was mediated by elevated levels of c-di-GMP in C. owensensis. These biofilms were effective in retaining biomass of both species in the reactor and improving QH2 in a UA reactor using granular sludge as the carrier material. This concept forms a basis for further optimizing the QH2 at laboratory scale and beyond.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-015-0201-7) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 67%

“…In a techno-economic analysis of a representative biohydrogen process, low Q H2 has been identified as a key bottleneck for making the process economically viable [27]. This study reports a higher Q H2 (approximately.…”

Section: Discussionmentioning

confidence: 94%

Biofilm formation by designed co-cultures of Caldicellulosiruptor species as a means to improve hydrogen productivity

Pawar

Vongkumpeang

Grey

et al. 2015

Biotechnol Biofuels

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“…However, the latter causes significant environmental impact (Ochs et al 2010) and also restricts water recirculation due to accumulation of salts. Moreover, addition of caustic agents like sodium hydroxide incurs significant costs (Ljunggren et al 2011a, b). When using expensive feedstocks such as lignocellulosic hydrolysates, it might require pH control to keep up better H 2 yields and productivities.…”

Section: Reactors and Culture Conditions Applied For Thermophilic Biomentioning

confidence: 99%

Thermophilic biohydrogen production: how far are we?

Pawar

Niel

2013

Appl Microbiol Biotechnol

106

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Apart from being applied as an energy carrier, hydrogen is in increasing demand as a commodity. Currently, the majority of hydrogen (H2) is produced from fossil fuels, but from an environmental perspective, sustainable H2 production should be considered. One of the possible ways of hydrogen production is through fermentation, in particular, at elevated temperature, i.e. thermophilic biohydrogen production. This short review recapitulates the current status in thermophilic biohydrogen production through fermentation of commercially viable substrates produced from readily available renewable resources, such as agricultural residues. The route to commercially viable biohydrogen production is a multidisciplinary enterprise. Microbiological studies have pointed out certain desirable physiological characteristics in H2-producing microorganisms. More process-oriented research has identified best applicable reactor types and cultivation conditions. Techno-economic and life cycle analyses have identified key process bottlenecks with respect to economic feasibility and its environmental impact. The review has further identified current limitations and gaps in the knowledge, and also deliberates directions for future research and development of thermophilic biohydrogen production.

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“…Taking into consideration Turkey's agricultural potential, the possible usages of agricultural products like straw as an energy source was desired in this study. Barley straw was selected as the agricultural waste product from barley production because it is the most common grain in Turkey after wheat [20] and a readily available lignocellulosic feedstock that contains relatively high amounts of five-carbon (C5) sugars [21]. The average annual production of barley in Europe and Turkey is about 95 million and 9 million tons per year, respectively [22].…”

Section: Introductionmentioning

confidence: 99%

“…The annual barley straw production is estimated to be more than 1.2 times that of barley production based on the residue-to-crop ratio. In Europe, a rough count gives a total annual production of barley straw of 114 million tons, equivalent to 511 TWh, assuming a lower heating value (LHV) of 16.3 MJ/kg dry matter [21].…”

Section: Introductionmentioning

confidence: 99%

Microwave and microwave-chemical pretreatment application for agricultural waste

İnan

Türkay

Akkiris

2016

Desalination and Water Treatment

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A B S T R A C TThis study aimed to investigate the effect of microwave (MW) and microwave-chemical (MWC) pretreatment on barley straw and to identify the acidic, basic, or oxidative chemicals that provide the highest sugar conversion for subsequent enzymatic hydrolysis. The MW and MWC processes were applied as a pretreatment step before fermentation. MW radiation at 200 and 300 W and MW radiation plus a chemical (H 2 SO 4 or NaOH or H 2 O 2 ) as catalyst were applied, and total sugar, total phenol, and Klason and acid-soluble lignin were measured. Although the MWC pretreatment produced a higher total sugar concentration than the MW pretreatment, the addition of an NaOH solution produced the best results in terms of all parameters. Fourier transform infrared analysis was also performed to observe the deterioration of molecular structures after the application of MW and MWC.

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Techno-economic comparison of a biological hydrogen process and a 2nd generation ethanol process using barley straw as feedstock

Cited by 59 publications

References 30 publications

Biofilm formation by designed co-cultures of Caldicellulosiruptor species as a means to improve hydrogen productivity

Biofilm formation by designed co-cultures of Caldicellulosiruptor species as a means to improve hydrogen productivity

Thermophilic biohydrogen production: how far are we?

Microwave and microwave-chemical pretreatment application for agricultural waste

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