Acid pre-treatment of sewage anaerobic sludge to increase hydrogen producing bacteria HPB: effectiveness and reproducibility

Tommasi, Tonia; Sassi, Guido; Ruggeri, Bernardo

doi:10.2166/wst.2008.506

Cited by 21 publications

(7 citation statements)

References 9 publications

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“…In the Berl saddles-based cell, the larger value of absorbance can be related to a higher and well-distributed biofilm inside the cell. Indeed, there was not a significant change in the OD600 on this cell after the first 2 days (lag-phase (Tommasi et al, 2008)). Instead, for the carbon felt-based MFC, a slightly decreases of the OD600 has been noticed, which suggest a non-uniform distribution and growth of the bacteria population in this anodic material.…”

Section: Resultsmentioning

confidence: 85%

Electrochemical and impedance characterization of Microbial Fuel Cells based on 2D and 3D anodic electrodes working with seawater microorganisms under continuous operation

Hidalgo

Sacco

Hernández

et al. 2015

Bioresource Technology

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A mixed microbial population naturally presents in seawater was used as active anodic biofilm of two Microbial Fuel Cells (MFCs), employing either a 2D commercial carbon felt or 3D carbon-coated Berl saddles as anode electrodes, with the aim to compare their electrochemical behavior under continuous operation. After an initial increase of the maximum power density, the felt-based cell reduced its performance at 5 months (from 7 to 4 μW cm(-2)), while the saddle-based MFC exceeds 9 μW cm(-2) (after 2 months) and maintained such performance for all the tests. Electrochemical impedance spectroscopy was used to identify the MFCs controlling losses and indicates that the mass-transport limitations at the biofilm-electrolyte interface have the main contribution (>95%) to their internal resistance. The activation resistance was one order of magnitude lower with the Berl saddles than with carbon felt, suggesting an enhanced charge-transfer in the high surface-area 3D electrode, due to an increase in bacteria population growth.

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Section: Resultsmentioning

confidence: 85%

Electrochemical and impedance characterization of Microbial Fuel Cells based on 2D and 3D anodic electrodes working with seawater microorganisms under continuous operation

Hidalgo

Sacco

Hernández

et al. 2015

Bioresource Technology

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“…Several methods have been proposed to achieve this aim, including heat treatment, acidification, basification, freezing or dehydration (Van Ginkel & Sung 2001;Ting et al 2004;Kawagoshi et al 2005;Tommasi et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Effects of heat treatment on microbial communities of granular sludge for biological hydrogen production

Alibardi

Favaro

Lavagnolo

et al. 2012

Water Science and Technology

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Dark fermentation shares many features with anaerobic digestion with the exception that to maximize hydrogen production, methanogens and hydrogen-consuming bacteria should be inhibited. Heat treatment is widely applied as an inoculum pre-treatment due to its effectiveness in inhibiting methanogenic microflora but it may not exclusively select for hydrogen-producing bacteria. This work evaluated the effects of heat treatment on microbial viability and structure of anaerobic granular sludge. Heat treatment was carried out on granular sludge at 100 °C with four residence times (0.5, 1, 2 and 4 h). Hydrogen production of treated sludges was studied from glucose by means of batch test at different pH values. Results indicated that each heat treatment strongly influenced the granular sludge resulting in microbial communities having different hydrogen productions. The highest hydrogen yields (2.14 moles of hydrogen per mole of glucose) were obtained at pH 5.5 using the sludge treated for 4 h characterized by the lowest CFU concentration (2.3 × 10(3)CFU/g sludge). This study demonstrated that heat treatment should be carefully defined according to the structure of the sludge microbial community, allowing the selection of highly efficient hydrogen-producing microbes.

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“…The physiological differences between hydrogen‐producing bacteria and hydrogen‐consuming bacteria laid the rationale basis of various pretreatments . Clostridia bacteria are able to form protective spores in restrictive extreme conditions.…”

Section: Sludge Pretreatmentmentioning

confidence: 99%

A state-of-the-art review of biohydrogen producing from sewage sludge

Yao

et al. 2018

Int J Energy Res

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Summary The amount of sewage sludge has increased remarkably with the acceleration of urbanization and the promotion of municipal wastewater treatment. Hydrogen is a promising clean fuel, considering the emerging global energy crisis and the growing demand for environmental protection. Producing hydrogen from sewage sludge through anaerobic fermentation is an economical and environmentally sustainable technology. Therefore, in this work, the mechanism of hydrogen production from sludge is critically reviewed and clarified. Current researches including sludge pretreatment and key factors affecting hydrogen production were investigated as well. Some challenges still remain, such as almost all studies feature experiments in batch cultures, and the hydrogen yields were not large. Further studies are needed in this arena, such as inhibiting hydrogen‐consuming bacteria, culturing, and screening high‐efficiency bacteria. The mechanism of hydrogen production from anaerobic co‐digestion, their factors, and techno‐economic evaluation need be further studied as well.

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Acid pre-treatment of sewage anaerobic sludge to increase hydrogen producing bacteria HPB: effectiveness and reproducibility

Cited by 21 publications

References 9 publications

Electrochemical and impedance characterization of Microbial Fuel Cells based on 2D and 3D anodic electrodes working with seawater microorganisms under continuous operation

Electrochemical and impedance characterization of Microbial Fuel Cells based on 2D and 3D anodic electrodes working with seawater microorganisms under continuous operation

Effects of heat treatment on microbial communities of granular sludge for biological hydrogen production

A state-of-the-art review of biohydrogen producing from sewage sludge

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