Valorizing waste iron powder in biogas production: Hydrogen sulfide control and process performances

Andriamanohiarisoamanana, Fetra J.; Shirai, Tomoya; Yamashiro, Takaki; Yasui, Seiichi; Iwasaki, Masahiro; Ihara, Ikko; Nishida, Takehiro; Tangtaweewipat, Suchon; Umetsu, Kazutaka

doi:10.1016/j.jenvman.2017.12.012

Cited by 41 publications

(21 citation statements)

References 33 publications

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“…The present proof of concept study, indicates that the addition of ZVI to anaerobic granular sludge, apart from biogas upgrading to biomethane, can substantially decrease H 2 S and NH 3 , as well. Regarding H 2 S removal, this is in line with the ndings of other studies (Liu et al 2015;Ruan et al 2017;Andriamanohiarisoamanana et al 2018;Wei et al 2018;Farghali et al 2020), whereas the current study also found that the presence of ZVI reduced mainly the low mass straight-chain and branched alkanes. This is the rst laboratory study experimentally demonstrated the ex-situ biogas upgrading under these conditions.…”

Section: Discussionsupporting

confidence: 93%

“…Apart from VOCs, biogas often contains hydrogen sul de (H 2 S), which can severely limit its application as it is related with harmful environmental emissions and corrodes the engines of biogas puri cation machinery (Farghali et al 2020). As was stated in recent studies (Ruan et al 2017;Andriamanohiarisoamanana et al 2018;Wei et al 2018;Farghali et al 2020), ZVSI could also help to prevent the emissions of H 2 S via iron-sul de (FeS) precipitation. Based on these ndings, this study will examine the ex-situ biogas upgrading and H 2 S removal in the same system.…”

Section: Introductionmentioning

confidence: 99%

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Ex-situ biogas upgrading to methane and removal of VOCs in a system of zero valent iron and anaerobic granular sludge

Lytras¹,

Ανδρονίκου²,

Chrysanthou³

et al. 2021

Preprint

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In the current study, a novel process of ex-situ biogas upgrading to biomethane is presented which is based on a system consisted of anaerobic sludge and zero valent iron (ZVI). The ZVI when is added in an aquatic system with anaerobic granular sludge generates H2 under anaerobic abiotic conditions. Then, the H2 and CO2 are converted by the hydrogenotrophic methanogens to CH4. Biogas upgrading to biomethane was achieved in 4 days in a system of anaerobic granular sludge, 50 g L1 ZVI initial pH 5 and 20 g L1 NaHCO3. In this system when zero valent scrap iron (ZVSI) was added instead of ZVI required longer period (21 days) to achieve biogas upgrading. Volatile organic compounds (VOCs) analysis in raw biogas (in system of anaerobic sludge and ZVI) showed mainly the reduction of low mass straight- and branched-chain alkanes (C6-C10); however, no other particular trend regarding the removal of other VOCs was observed. H2S and NH3 were found to be substantially reduced, when the anaerobic sludge was exposed to ZVI compared to no decrease in serum bottles free of ZVI.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Ex-situ biogas upgrading to methane and removal of VOCs in a system of zero valent iron and anaerobic granular sludge

Lytras¹,

Ανδρονίκου²,

Chrysanthou³

et al. 2021

Preprint

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“…Compared with Fe 2+ , ZVI can decrease oxidative-reductive potential of the anaerobic digestion media, serve as electron donor for hydrogenotrophic methanogens, and provide a more favorable environment for anaerobic digestion. However, waste iron powder had no effect on digestion performances of cow manure (Andriamanohiarisoamanana et al, 2018). Therefore, it is inconclusive that whether ZVI can enhance the AD of cow manure and accelerate the hydrolysis, acidification and methanogenesis process.…”

Section: Introductionmentioning

confidence: 99%

Effects of Adding Zero Valent Iron on the Anaerobic Digestion of Cow Manure and Lignocellulose

Men

Zheng

Zhang

et al. 2020

Front. Bioeng. Biotechnol.

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Previous studies showed that adding zero valent iron (ZVI) can increase the methane production and degradation rate of organic waste by improving the performance of anaerobic digester. However, our study firstly found that ZVI (37 µm, 10 g/L) inhibited the anaerobic digestion (AD) of cow manure and lignocellulose. ZVI significantly increased the methanogenic rate of cow manure in the first 6 days, but decreased the accumulative methane yield and volatile fatty acids yield by 10.3 and 12%, respectively. The effect of ZVI on AD of liquid biomass separated from cow manure was positive, but the effect on solid biomass was negative. These results indicated that ZVI enhanced the AD of easily biodegradable organics but inhibited the biodegradation of refractory organics (lignocellulose). By analyzing the varying effects of ZVI in diverse anaerobic systems, it was found that the effects were influenced by the characteristics of substrate and inoculum-substrate ratio. This study suggested that only proper ZVI addition can improve the AD process depending on the feeding materials.

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“…Waste iron powder did not have a significant effect on methane yield in the batch and bench experiments, but the hydrolysis rate constant was almost doubled and the lag-phase period halved in test digesters compared to control digesters without iron dosage. In bench experiments, the H 2 S concentration was reduced by 89% at 2.0 g/L, and by 50% at 1.0 g/L, without harming the digestion process [15].…”

Section: Introductionmentioning

confidence: 94%

Ferric Oxide-Containing Waterworks Sludge Reduces Emissions of Hydrogen Sulfide in Biogas Plants and the Needs for Virgin Chemicals

Persson

Åström

2021

Sustainability

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Ferric oxide-containing waterworks sludge can be used to reduce the formation of hydrogen sulfide during anaerobic digestion. The ferric compound is reduced biochemically in the digester and forms insoluble pyrite in digester sludge. Virgin ferric chloride is often used to solve the hydrogen sulfide problem. Since 2013, Sydvatten AB has supplied a growing number of digestion plants in Sweden with ferric-containing dewatered waterworks sludge derived from the drinking water treatment plant Ringsjöverket to limit the formation of hydrogen sulfide. At the waterworks, ferric chloride is added to enhance the coagulation of organic matter from the source water. The sludge formed in this process is dewatered and landfilled, but also recycled in biogas production in order to decrease the hydrogen sulfide concentration. In this study, the use of sludge for hydrogen sulfide removal in digesters was technically and economically evaluated via case studies from 13 full-scale digesters in Sweden. Compared with the use of fresh ferric chloride, the operational costs are reduced by up to 50% by using sludge. The quality of the sludge is high and its content in metals is low or very low, especially when compared with the requirements of different certification standards for biosolid reuse applied in Sweden. The addition of waterworks sludge containing iron to a digester for the removal of dissolved hydrogen sulfide is a technically and economically good alternative when producing biogas. It is also one step closer to a circular economy, as replacing the use of virgin chemicals with the by-product waterworks sludge saves energy and materials and reduces the carbon footprint of the waterworks.

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Valorizing waste iron powder in biogas production: Hydrogen sulfide control and process performances

Cited by 41 publications

References 33 publications

Ex-situ biogas upgrading to methane and removal of VOCs in a system of zero valent iron and anaerobic granular sludge

Ex-situ biogas upgrading to methane and removal of VOCs in a system of zero valent iron and anaerobic granular sludge

Effects of Adding Zero Valent Iron on the Anaerobic Digestion of Cow Manure and Lignocellulose

Ferric Oxide-Containing Waterworks Sludge Reduces Emissions of Hydrogen Sulfide in Biogas Plants and the Needs for Virgin Chemicals

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