Sulphur retention during co-combustion of coal and sewage sludge

Folgueras, M.B.; Dı́az, R.; Xiberta, Jorge

doi:10.1016/j.fuel.2004.01.015

Cited by 65 publications

(33 citation statements)

References 8 publications

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“…Thus, research has focused on the development and characterization of technologies for co-combustion of coal with various additives, including not only ligneous biomass and agricultural residue (1)(2)(3) but also sewage sludge (4)(5)(6)(7)(8) . Although the moisture content in sewage sludge is higher than that in woody biomass, both the production amounts and chemical properties of dewatered sewage sludge (DSS) are nearly constant, regardless of seasonal variations, and most cities in Japan have developed the infrastructure needed for sewage sludge collection.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Malodor Reduction in Dewatered Sewage Sludge by Means of The Hydrothermal Torrefaction

Namioka

Morohashi²,

Yoshikawa

2011

JEE

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To evaluate malodor reduction by means of the hydrothermal torrefaction, concentrations of the main malodorous compounds in odor samples from solid products before and after treatment were measured using gas chromatography. The concentrations of the sulfur-containing compounds were decreased by this treatment. To elucidate the mechanisms of this malodor reduction, odor distributions were analyzed with an odor-measuring device. The odor intensities in the odor sample from the solid product were lower than those from the dewatered sewage sludge (DSS), whereas the odor intensities in samples from liquid and gaseous products were as high as or higher than those from the DSS. Therefore, we conclude that one of the main malodor reduction mechanisms is reactive distillation: malodorous compounds are separated from the solid product by the inherent thermal effect of the hydrothermal torrefaction. In addition, the masking effect of odorous compounds produced as by-products in this treatment process and the sterilization of microbes in DSS probably play important roles in malodor reduction as well.

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Section: Introductionmentioning

confidence: 99%

Mechanisms of Malodor Reduction in Dewatered Sewage Sludge by Means of The Hydrothermal Torrefaction

Namioka

Morohashi²,

Yoshikawa

2011

JEE

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“…Various studies have observed an increase in sulphur retention when WAS is added as a cofuel because of the high Ca-content of most WAS (Spliethoff and Hein, 1998;Folgueras et al, 2004;Werther, 2007). Although this presence of alkali helps in reducing SO 2 emissions it is recommended to keep the amount of S in the WAS as low as possible.…”

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confidence: 99%

Evolution of the Total Sulphur Content in Full-Scale Wastewater Sludge Treatment

Dewil

Baeyens

Roels

et al. 2009

Environmental Engineering Science

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The present research studies the evolution of sulphur concentrations during wastewater treatment for various full-scale treatment plants and reveals that a significant amount of S is released as highly soluble sulphates with the sludge water during sludge thickening when sludge is still in aerobic conditions. During digestion, sulphur concentrations in the sludge (expressed as mg S=kg of dry solids) generally increased due to destruction of organic material, and relatively low release of H 2 S. During sludge dewatering following anaerobic digestion, only a minor fraction of sulphur is found in sludge water, because sulphates have already been reduced into insoluble sulphides. To limit the sulphur concentration in the waste sludge, it is beneficial to extensively dewater the sludge when still under aerobic conditions, that is, before long-term sludge storage. If anaerobic digestion is used, the formation of sulphides is inevitable, as insoluble sulphides, and to a lesser extent H 2 S.

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“…The same occurs with HF1 and HF2 blends. Therefore, in the ashing process, the S retention is produced according to the following reactions [28]:…”

Section: Behaviour Of Na 2 O K 2 O and S In Ashing Processmentioning

confidence: 99%

Effect of sludge addition to coal on Na, K and S volatilisation in ashing process and ash fusibility

Folgueras

Alonso

Folgueras

2015

Fuel Processing Technology

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Sulphur retention during co-combustion of coal and sewage sludge

Cited by 65 publications

References 8 publications

Mechanisms of Malodor Reduction in Dewatered Sewage Sludge by Means of The Hydrothermal Torrefaction

Mechanisms of Malodor Reduction in Dewatered Sewage Sludge by Means of The Hydrothermal Torrefaction

Evolution of the Total Sulphur Content in Full-Scale Wastewater Sludge Treatment

Effect of sludge addition to coal on Na, K and S volatilisation in ashing process and ash fusibility

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