Characterization of Sulfur in Raw and Anaerobically Digested Municipal Wastewater Treatment Sludges

Du, Weiwei; Parker, Wayne

doi:10.2175/106143012x13407275694671

Cited by 20 publications

(14 citation statements)

References 28 publications

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“…The elemental sulfur produced may partly attach to the walls and ceilings, or leave the reactor with digested sludge. Other studies have not detected significant flows of sulfur in the biogas during the studying of sulfur flows in anaerobic digestion (Dewil et al, 2008;Du and Parker, 2013;Yoshida et al, 2015). During the digestion process, the formation of metal sulfide and hydrogen sulfide are expected due to the reduction of sulfate and also degradation of organic sulfur especially from primary sludge source (Du and Parker, 2013).…”

Section: Sulfur Distribution In the Sludge Linementioning

confidence: 99%

“…Other studies have not detected significant flows of sulfur in the biogas during the studying of sulfur flows in anaerobic digestion (Dewil et al, 2008;Du and Parker, 2013;Yoshida et al, 2015). During the digestion process, the formation of metal sulfide and hydrogen sulfide are expected due to the reduction of sulfate and also degradation of organic sulfur especially from primary sludge source (Du and Parker, 2013). Sulfur removed in the centrate following the pre-dewatering of the anaerobically digested sludge (MS69) was 0.9 ± 0.7% of the sulfur in the influent wastewater, showing that 18% sulfur entering pre-dewatering process being removed in the centrate.…”

Section: Sulfur Distribution In the Sludge Linementioning

confidence: 99%

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Plant-wide investigation of sulfur flows in a water resource recovery facility (WRRF)

Forouzanmehr

Solon

et al. 2021

Science of The Total Environment

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Section: Sulfur Distribution In the Sludge Linementioning

confidence: 99%

Section: Sulfur Distribution In the Sludge Linementioning

confidence: 99%

Plant-wide investigation of sulfur flows in a water resource recovery facility (WRRF)

Forouzanmehr

Solon

et al. 2021

Science of The Total Environment

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“…Sommers et al 1977, Du andParker 2013). Determining S speciation is of importance as it has a direct influence on the chemical speciation and dynamics of trace metals.…”

Section: Sulfur Speciation In Biogas Reactorsmentioning

confidence: 99%

Chemical speciation of sulfur and metals in biogas reactors – Implications for cobalt and nickel bio-uptake processes

Yekta

Skyllberg

Danielsson

et al. 2017

Journal of Hazardous Materials

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A balanced supply of micronutrients, including metals such as iron (Fe), cobalt (Co), and nickel (Ni), is required for the efficient and stable production of biogas. During biogas formation, the uptake of micronutrient metals by microorganisms is controlled by a complex network of biological and chemical reactions, in which reduced sulfur (S) compounds play a central role. This thesis addresses the interrelationship between the overall chemical speciation of S, Fe, Co, and Ni in relation to the metals bio-uptake processes. Laboratory continuous stirred tank biogas reactors (CSTBR) treating S-rich grain stillage, as well as a number full-scale CSTBRs treating sewage sludge and various combinations of organic wastes, termed codigestion, were considered. Sulfur speciation was evaluated using acid volatile sulfide (AVS) extraction and S X-ray absorption near edge structure (XANES). The chemical speciation of Fe, Co, and Ni was evaluated through the determination of aqueous metals and metal fractions pertaining to solid phases, as well as kinetic and thermodynamic analyses (chemical speciation modelling).The relative Fe to S content in biogas reactors, which in practice is regulated through the addition of Fe for the purpose of sulfide removal or prior to the anaerobic digestion of sewage sludge, is identified as a critical factor for the chemical speciation and bio-uptake of metals. In the reactors treating sewage sludge, the quantity of Fe exceeds that of S, inducing Fe(II)-dominated conditions under anaerobic conditions, while sulfide dominates in the co-digestion and laboratory reactors due to an excess of S over Fe. Under sulfide-dominated conditions, chemical speciation of the metals is regulated by hydrogen sulfide and the formation of metal sulfide precipitates, which in turn restrict the availability of metals for microorganisms. However, despite the limitations set by sulfide, aqueous concentrations of different Co and Ni species were shown to be sufficient to support metal acquisition by the microorganisms under sulfidic conditions. Comparatively, the concentrations of free metal ions and labile metalphosphate and -carbonate complexes in aqueous phase, which directly participate in bio-uptake processes, are higher under Fe-dominated conditions. This results in an enhanced metal adsorption on cell surfaces and faster bio-uptake rates. It is therefore suggested that the chemical speciation and potential bioavailability of metals may be controlled through adjustments of the influent Fe concentration in relation to S content. The results also indicated that the pool of metal sulfides in the biogas reactors could be regarded as a source of metals for microbial activities. Thus, the recovery and utilisation of this fraction of metals may be considered as a measure with which to minimise the metal dosing concentrations to CSTBRs.Keywords: Biogas, Anaerobic digestion, Chemical speciation, bio-uptake, Sulfur, Iron, Cobalt, Nickel SammanfattningFör att en effektiv och stabil biogasproduktion från organiskt a...

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“…S in wasted sludge is primarily constituted of S-containing biomolecules (e.g., amino acids with Scontaining side chains), inorganic sul des, and insoluble sulfate (Lin et al, 2014;Du and Parker, 2013;Dewil et al,2008;Svanström et al, 2005). Compared with most biomass, the characteristics of sludge related to thermochemical conversion during pyrolysis are more complex and different (Thipkhunthod et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Study on the emission characteristics and mechanism of sulfur-containing gas during sludge pyrolysis at low temperature

Shang¹,

Fan²,

Li³

et al. 2021

Preprint

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The effects of temperature, time, and calcium-based ultrafine powder on sulfur-containing gas in the sludge drying process were examined through experiments, and effective measures to control the release of sulfur-containing gases such as CS2, H2S, and SO2 were proposed. Experimental results showed that the drying temperature of sludge should be controlled below 250°C, and the drying duration should be kept within 1 min. Additionally, the release amount of three gases released was small. When the addition amount of calcium-based powder added reached 20% of the original sludge mass fraction, the concentration of sulfur-containing gas released was 59.81 mg/m3, 94% lower than that of the dry pure sludge gas. After absorption by calcium-based powder, there are almost no sulfur-containing organic compounds and sulfur-containing gases. The research results provide a direction for the selection of pyrolysis sludge treatment technology, which is conducive to control the discharge of harmful gases.

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Characterization of Sulfur in Raw and Anaerobically Digested Municipal Wastewater Treatment Sludges

Cited by 20 publications

References 28 publications

Plant-wide investigation of sulfur flows in a water resource recovery facility (WRRF)

Plant-wide investigation of sulfur flows in a water resource recovery facility (WRRF)

Chemical speciation of sulfur and metals in biogas reactors – Implications for cobalt and nickel bio-uptake processes

Study on the emission characteristics and mechanism of sulfur-containing gas during sludge pyrolysis at low temperature

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