Hydrothermal Treatment of Dewatered Sewage Sludge Cake for Solid Fuel Production

Namioka, Tomoaki; Morohashi, Yoshiaki; Yamane, Ryosuke; Yoshikawa, Kunio

doi:10.1299/jee.4.68

Cited by 24 publications

(25 citation statements)

References 4 publications

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“…Hence, the most promising way is to pretreat the bio-wastes with some physical, chemical or thermal methods to improve the mechanical dewaterability and then remove the water with mechanical dewatering. Accordingly, three "bio-wastes to solid fuel" technologies, including combination of the thermal drying and physical mixing [84,157], chemical conditioning [158,159] and thermal pretreatment [18,34,46,52,60,62,63,65,67,102,113,156,[160][161][162][163], were proposed to produce solid fuel from sewage sludge, MSW etc. Fig.2 presents a conceptual schematic of clean solid biofuel production from the high moisture content bio-wastes by HT and conventional thermal drying.…”

Section: Biomass Upgradingmentioning

confidence: 99%

Clean solid biofuel production from high moisture content waste biomass employing hydrothermal treatment

et al. 2014

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Our society currently faces three challenges, including resource depletion, waste accumulation and environmental degradation, leading to rapidly escalating raw material costs and increasingly expensive and restrictive waste disposal legislation. This work aims to produce clean solid biofuel from high moisture content waste biomass (bio-waste) with high nitrogen (N)/chlorine (Cl) content by mild hydrothermal (HT) conversion processes. The newest results are summarized and discussed in terms of the mechanical dewatering and upgrading, dechlorination, denitrification and coalification resulting from the HT pretreatment. Moreover, both the mono-combustion and co-combustion characteristics of the solid fuel are reviewed by concentrating on the pollutants emission control, especially the NO emission properties. In addition, the feasibility of this HT solid biofuel production process is also discussed in terms of "Energy Balance and economic viability". As an alternative to dry combustion/dry pyrolysis/co-combustion, the HT process, combining the dehydration and decarboxylation of a biomass to raise its carbon content aiming to achieve a higher calorific value, opens up the field of potential feedstock for lignite-like solid biofuel production from a wide range of nontraditional renewable and plentiful wet agricultural residues, sludge and municipal wastes. It would contribute to a wider application of HT pretreatment bio-wastes for safe disposal and energy recycling.

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Section: Biomass Upgradingmentioning

confidence: 99%

Clean solid biofuel production from high moisture content waste biomass employing hydrothermal treatment

et al. 2014

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“…A new method of sewage sludge pretreatment for co-combustion, the hydrothermal torrefaction, recently has been proposed and studied (11)(12)(13) . This method involves thermal treatment under saturated steam conditions at temperatures around 473 K with stirring.…”

Section: Introductionmentioning

confidence: 99%

“…This method involves thermal treatment under saturated steam conditions at temperatures around 473 K with stirring. The treatment has been shown to improve the dewaterability of sewage sludge (11,12) and the drying rate of municipal solid waste (14) . The total thermal input for removing moisture from sewage sludge by this method is comparable with that of drying treatments.…”

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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“…The thermal drying process is the most energy-intensive one during the biofuel production, accounting for about 70% of the total energy consumption [11,12]. Thus, one of the efficient ways to save energy is to remove more water from the sludge during the TH and AD processes.…”

Section: Thermal Hydrolysis Process Anaerobic Digestion and Sludge Dmentioning

confidence: 99%

Modeling and cost estimation of energy production from sludge

2017

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Energy recovery from sewage sludge offers an opportunity for sustainable management of sewage sludge and energy. Anaerobic digestion and pyrolysis are among the most promising processes applicable for sewage sludge-to-energy conversion. Anaerobic digestion of sewage sludge forms methane-rich biogas, which can be utilized as fuel to offset heat and electricity consumption of the wastewater treatment sector. However, the digestion process has the efficiency limitation since it cannot sufficiently extract the energy from sewage sludge. The digested sludge is still energy profitable and it contains considerable organic matter, but poor in biodegradability. This paper presents a brief overview of anaerobic digestion, pyrolysis, and the combination of other processes with anaerobic digestion in the application to bio energy production from sewage sludge. An assessment of energy conversion of five sludge to energy pathways is also presented. The pathways via pyrolysis and the combination of anaerobic digestion, thermal hydrolysis, and thermal drying could achieve higher energy efficiency compared to other pathways.

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Hydrothermal Treatment of Dewatered Sewage Sludge Cake for Solid Fuel Production

Cited by 24 publications

References 4 publications

Clean solid biofuel production from high moisture content waste biomass employing hydrothermal treatment

Clean solid biofuel production from high moisture content waste biomass employing hydrothermal treatment

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

Modeling and cost estimation of energy production from sludge

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