BioH2 &amp; BioCH4 Through Anaerobic Digestion

Ruggeri, Bernardo; Tommasi, Tonia; Sanfilippo, Sara

doi:10.1007/978-1-4471-6431-9

Cited by 51 publications

(25 citation statements)

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“…This phenomenon could be attributed to a better adaptation to the culture medium by the H 2 ‐producing microorganisms, which remained in the inoculum after its pretreatment, because of improved spore reactivation process induced by the applied rest time. The rest time might have also facilitated a lag‐time reduction and enhanced the growth rate of H 2 ‐producing bacteria …”

Section: Resultssupporting

confidence: 90%

“…Increasing the % glycerol from 25% to 75% favored hydrogen yield and productivity. The high availability of glycerol in the substrate could facilitate the proliferation of H 2 ‐producing microorganisms, allowing the production and accumulation of H 2 in the system because the formation of this compound has been associated to microbial growth . Other authors have also reported satisfactory results of hydrogen production and yield with the use of glycerol‐rich substrates, for example, crude and pure glycerol .…”

Section: Resultsmentioning

confidence: 99%

“…The rest time might have also facilitated a lag-time reduction and enhanced the growth rate of H 2 -producing bacteria. [23][24][25] When methanol-based solutions were used as substrate, H 2 was not detected in all the tests carried out ( Figure 1B1). The maximum biogas productivities were reached with untreated control sludge and Alkaline-shock pretreated sludge (56.7 ± 3.5 mL/L.d and 54.0 ± 2.2 mL/L.d, respectively).…”

Section: Methodsmentioning

confidence: 99%

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Biohydrogen production from pretreated sludge and synthetic and real biodiesel wastewater by dark fermentation

García

Cammarota

2019

Int J Energy Res

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Summary Different types of sludge pretreatments were tested, with thermal shock at 90°C to 95°C for 60 minutes plus a 6‐hour rest period achieving the best results for inhibition of methanogen microorganisms and inoculum enrichment with H2‐producing bacteria, which produced a H2‐rich biogas (up to 65% mol/mol) without the presence of CH4. Wastewater from biodiesel production (WBP), containing mainly methanol (128 g/L) and glycerol (4 g/L), was evaluated as a potential substrate to produce H2 through dark fermentation. Both methanol‐based solutions and methanol‐rich wastewater were not suitable for hydrogen production; however, these effluents showed a strong potential for CH4‐rich biogas production. A fractional factorial design was employed to evaluate the effect of six substrate‐related variables (glycerol content, 25% and 75%; COD content, 4 and 50 g/L, COD:VSS ratio, 1:1 and 5:1; COD:N:P ratio, 350:0:0 and 350:5:1; NaCl content, 0.5 and 12.0 g/L; and pH, 4.0 and 5.5) on the H2 production from glycerol‐methanol–based synthetic solutions (synthetic WBP). Some substrate‐related variables had a crucial impact on the hydrogen production potential from WBP, which was significantly affected by the COD and salinity content in the substrate. WBP containing high glycerol (representing until 75% of the COD) and salinity (up to 12 g/L as NaCl) content could be turned into a potential substrate for H2 production through dark fermentation as long as specific fermentation conditions are maintained, such as pH 5.5 to 5.7 and a substrate COD content up to 50 g/L. Using this condition, glycerol conversion, H2 productivity, and H2 yield of 81.3 ± 8.9%, 102.8 ± 18.2 mL H2/L.d, and 24.5 ± 4.4 mL H2/g CODapplied, respectively, were obtained.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Biohydrogen production from pretreated sludge and synthetic and real biodiesel wastewater by dark fermentation

García

Cammarota

2019

Int J Energy Res

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“…To enhance the advantages of anaerobic digestion, either of energetic point of view or de-pollution benefits, two stages can be used by separating acidogenesis and methanogenesis process which lead to bioH2 and bioCH4 production, respectively [74]. During the natural process of anaerobic digestion, some bacteria convert the organic material present in the digester into hydrogen, carbon dioxide and watersoluble metabolites such as acetic acid, butyric acid, propionic acid and ethanol.…”

Section: Integration Of Pmec With Dark Anaerobic Fermentationmentioning

confidence: 99%

“…and solvent (ethanol, butanol and acetone), reducing all possible hydrogen yields [74]. Since in any case these VFA have to be treated [93], the adoption of a MFC lead to an additional electric energy production which may assist the PMEC reactor or the balance-of-plant components (e.g., pumps, membrane for CO2/H2 separator etc.)…”

Section: Expected Impacts Of the Pmec Technologymentioning

confidence: 99%

Development of a Photosynthetic Microbial Electrochemical Cell (PMEC) Reactor Coupled with Dark Fermentation of Organic Wastes: Medium Term Perspectives

2015

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Abstract:In this article the concept, the materials and the exploitation potential of a photosynthetic microbial electrochemical cell for the production of hydrogen driven by solar power are investigated. In a photosynthetic microbial electrochemical cell, which is based on photosynthetic microorganisms confined to an anode and heterotrophic bacteria confined to a cathode, water is split by bacteria hosted in the anode bioactive film. The generated electrons are conveyed through external "bio-appendages" developed by the bacteria to transparent nano-pillars made of indium tin oxide (ITO), Fluorine-doped tin oxide (FTO) or other conducting materials, and then transferred to the cathode. On the other hand, the generated protons diffuse to the cathode via a polymer electrolyte membrane, where they are reduced by the electrons by heterotrophic bacteria growing attached to a similar pillared structure as that envisaged for the anode and supplemented with a specific low cost substrate (e.g., organic waste, anaerobic digestion outlet). The generated oxygen is released to the atmosphere or stored, while the produced pure hydrogen leaves the electrode through the porous layers. In addition, the integration of the photosynthetic microbial electrochemical cell system with dark fermentation as acidogenic step of anaerobic digester, which is able to produce additional H2, and the use of microbial fuel cell, feed with the residues of dark fermentation (mainly volatile fatty acids), to produce the necessary extra-bias for the photosynthetic microbial electrochemical cell is here analyzed to reveal the potential benefits to this novel integrated technology. OPEN ACCESS

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