Drying of municipal sewage sludge: from a laboratory scale batch indirect dryer to the paddle dryer

Arlabosse, Patricia; Chavez, Sofia; Prévot, C.

doi:10.1590/s0104-66322005000200009

Cited by 47 publications

(29 citation statements)

References 4 publications

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“…Because no inventory is available within the existing LCA database applicable to carbonization, this study adopts an energy model developed by Maski et al for biomass pretreatment [16] and previous research results of biomass torrefaction [17][18][19]. This study also refers to a batch-type carbonation experiment, conducted by Park and Jang [4], specific to dried sewage sludge at 300-500 °C for 30 min.…”

Section: Simulation Of the Sewage Sludge Carbonization Processmentioning

confidence: 99%

Furfurals As Chemical Platform For Biofuels Production

2015

Solid Waste as a Renewable Resource

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Carbonization is a newly developed process that converts sewage sludge to biocoal, a type of solid biomass that can partially substitute for coal during power generation. This study presents an assessment of the environmental effects of various sewage sludge treatment processes, including carbonization, direct landfills, co-incineration with municipal solid waste, and mono-incineration in Taiwan. This assessment was conducted using the life cycle assessment software SimaPro 7.2 and the IMPACT2002+ model. Results show that carbonization is the best approach for sewage sludge treatment, followed in descending order by co-incineration with municipal solid waste, direct landfills, and mono-incineration. The carbonization process has noticeable positive effects in the environmental impact categories of terrestrial ecotoxicity, aquatic ecotoxicity, land occupation, ionizing radiation, aquatic eutrophication, non-renewable energy, and mineral extraction. For the emission quantity of greenhouse gases, landfilling has the greatest impact (296.9 kg CO 2 eq./t sludge), followed by mono-incineration (232.2 kg CO 2 eq./t sludge) and carbonization (146.1 kg CO 2 eq./t sludge). Co-incineration with municipal solid waste has the benefit of reducing green house gas emission (-15.4 kg CO 2 eq./t sludge). In the aspect of energy recovery, sewerage sludge that has been pretreated by thickening, digestion, and dewatering still retains a high moisture content, and thus requires a significant amount of energy use when used as a substitute solid fuel. Therefore, the carbonization of sewage sludge would be a more sustainable option if the energy delivery and integration processes are made more efficient.

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Section: Simulation Of the Sewage Sludge Carbonization Processmentioning

confidence: 99%

Furfurals As Chemical Platform For Biofuels Production

2015

Solid Waste as a Renewable Resource

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“…Thermodynamic properties of the dried sludge at different temperatures and water content required by this approach (specific heat and heat conductivity) can be obtained thanks to the studies [8] and [9]. The specific heat is calculated with equations:…”

Section: Heat Transport In the Dried Mattermentioning

confidence: 99%

Two-dimensional CFD modeling of the heat and mass transfer process during sewage sludge drying in a solar dryer

Krawczyk¹,

Badyda²

2011

Archives of Thermodynamics

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The paper presents key assumptions of the mathematical model which describes heat and mass transfer phenomena in a solar sewage drying process, as well as techniques used for solving this model with the Fluent computational fluid dynamics (CFD) software. Special attention was paid to implementation of boundary conditions on the sludge surface, which is a physical boundary between the gaseous phase -air, and solid phasedried matter. Those conditions allow to model heat and mass transfer between the media during first and second drying stages. Selection of the computational geometry is also discussed -it is a fragment of the entire drying facility. Selected modelling results are presented in the final part of the paper.

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“…In order to obtain the water vapor distribution in the gas phase, the species transport equation (convection-diffusion equation) is used as shown in Equation (27).…”

Section: Drying Model Equations -Heat and Mass Transfermentioning

confidence: 99%