Limiting the Pollutant Content in the Sewage Sludge Producer Gas through Staged Gasification

Hernández, Ana Belén Roig; Ferrasse, Jean‐Henry; Roche, Nicolás

doi:10.1002/ceat.201300103

Cited by 22 publications

(20 citation statements)

References 66 publications

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“…Moreover, it can be observed that the ammonia released have the same kinetics trend for all feedstocks: production begins at 573 K ± 20 K, the maximum production was reached at about 823 K (SWWS 7% volume fraction, DWWS 6% volume fraction and WW 3% volume fraction). The same trend of ammonia release for WWS was described in earlier work by Hernandez et al [8]. WWS (S and D) are the most syngas pollutant release feedstock.…”

Section: Ammonia and Co Releasesupporting

confidence: 78%

“…The experimental setup used in this study was developed by Hernandez et al [8]. It has been established that this reactor is Abbreviation (Volumes are given in m 3 conversion rate consistent to study the pollutants and fuel gas release during pure steam gasification [5,8]. The equipment consists on a laboratory scale semi-batch gasifier.…”

Section: Methodsmentioning

confidence: 99%

“…Kinetic of pollutants (NH 3 ) release can be different from fuel gas (CO, H 2 , CH 4 …) release. Indeed Hernandez et al [8] compared the NH 3 release to fuel gas release such as CO under pure steam gasification conditions for WWS, they found that the most part of ammonia is released below 773 K and fuel gas over 773 K. Thereby, in this work the NH 3 and CO kinetic release were selected as a comparison of parameters. The release of NH 3 and CO was followed by FTIR depending on time and temperature according to the protocol developed previously by Hernandez et al [8].…”

Section: Ammonia and Co Releasementioning

confidence: 99%

“…Gasification is an alternative thermal process that allows for a solid mass reduction (approximately 70% of the solids initial dry mass (dm)) [7], the energy recovery and the removal of organic pollutants and pathogenic organisms. Unlike incineration, gasification may limit the presence of SO x and NO x precursors in the syngas [8] and reduce the leachability (or potential toxicity) of ash [5]. Co-gasification based on multi materials can improve the quality of the raw fuel gasification [9e11].…”

Section: Introductionmentioning

confidence: 99%

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Co-gasification of wastewater sludge and different feedstock: Feasibility study

Akkache

Hernández

Teixeira

et al. 2016

Biomass and Bioenergy

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International audienceGasification experiments were performed for several feedstocks alone (wastewater sludge, waste wood, reeds, olive pomace, solid recovered fuel, paper labels and plastic labels) using a fixed bed reactor operating in semi-batch conditions. In order to combine them in an optimal gasifying blend, the gasification behavior of each feedstock was compared with that of wastewater sludge through the following criteria: the raw feedstock proximate and ultimate composition, the solid conversion, the gas heating value, the pollutants release and the ashes melting. Operated alone, the conversion rate of the feedstocks after 58 min of solid residence time was over 77% of initial mass. The Syngas low heating value produced at 1123 K was in the range of 9.0 to 11.9 MJ m À3. The major concerns regarding the wastewater sludge were the pollutants precursors' release (NH 3 , COS…) and the ash slagging and fouling. The calculated slagging and fouling indexes were high also for olive pomace and for waste wood. Finally, among the possible blends studied the paper labels and plastic labels can be co-gasified with secondary and digested wastewater sludge without any restriction, reeds and solid recovered fuel can be blinded with secondary wastewater sludge without any restriction, a specific attention have to be taken to fouling when they are blended with digested wastewater sludge. The blend based on waste wood and olives pomace should be avoided for instance due to their ash slagging and fouling tendency

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Section: Ammonia and Co Releasesupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Section: Ammonia and Co Releasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Co-gasification of wastewater sludge and different feedstock: Feasibility study

Akkache

Hernández

Teixeira

et al. 2016

Biomass and Bioenergy

View full text Add to dashboard Cite

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“…C1 gases, mainly CO and CO 2 , can be obtained from the gasification of wastes, coal, biomass and other feedstocks . Syngas is a complex mixture of gases, composed mainly of CO, CO 2 , and H 2 , which can be fermented by clostridia and other acetogens, mostly into acids and/or alcohols. Interestingly, those same gaseous substrates are found in some waste gases, among others in gaseous effluents from steel industries.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH control on the anaerobic H‐B‐E fermentation of syngas in bioreactors

Fernández-Naveira

Veiga

Kennes

2017

J of Chemical Tech & Biotech

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BACKGROUND Syngas and some waste gases are composed mainly of carbon monoxide, carbon dioxide and hydrogen, which can be used by some acetogenic bacteria to produce ethanol, butanol or hexanol, and represents an attractive alternative to the conventional ABE (acetone–butanol–ethanol) fermentation. Experiments were carried out in bioreactors under different conditions (pH 5.75 and 4.75) with continuous supply of a mixture of CO/CO2/H2/N2 converted by Clostridium carboxidivorans into hexanol, butanol and ethanol (H‐B‐E fermentation). RESULTS Applying different pH control strategies will affect the syngas fermentation pattern, among others in terms of bioconversion rates as well as final concentrations of acids and alcohols. The highest concentrations of alcohols were obtained at pH 5.75, i.e. 2.7 g L−1 ethanol, 1.9 g L−1 butanol and 0.85 g L−1 hexanol, whereas the maximum production rates were observed at pH 4.75, reaching 0.048 g‐ethanol h−1 g−1‐biomass, 0.037 g‐butanol h−1 g−1‐biomass, and 0.026 g‐hexanol h−1 g−1‐biomass. However, a low pH negatively affects growth and acids production in the first metabolic step, with lower growth and acids production at pH 4.75 than 5.75. Growth rates reached 0.0057 h−1 and 0.072 h−1, respectively, at pH 4.75 and 5.75. CONCLUSIONS Maintaining initially a higher pH of 5.75 allows accumulating higher concentrations of acids than when natural acidification takes place. Such higher concentrations of acids allow the production of higher amounts of alcohols as end metabolites, showing the importance of pH on bioconversion and biomass growth. © 2017 Society of Chemical Industry

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