Thermal conductivity characteristics of dewatered sewage sludge by thermal hydrolysis reaction

Song, Hyoung Woon; Park, Keum Joo; Han, Seong Kuk; Jung, Hee Suk

doi:10.1080/10962247.2014.955926

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…The results are expressed in the final line of Table 2. Regarding thermal conductivity, the low value is also presented by [47,48]. The sewage sludge ashes' chemical characterization is presented in Table 3.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Sewage Sludge Plasma Gasification: Characterization and Experimental Rig Design

Pacheco,

Ribeiro,

Oliveira

et al. 2024

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The treatment of wastewater worldwide generates substantial quantities of sewage sludge (SS), prompting concerns about its environmental impact. Various approaches have been explored for SS reuse, with energy production emerging as a viable solution. This study focuses on harnessing energy from domestic wastewater treatment (WWT) sewage sludge through plasma gasification. Effective syngas production hinges on precise equipment design which, in turn, depends on the detailed feedstock used for characterization. Key components of plasma gasification include the plasma torch, reactor, heat exchanger, scrubber, and cyclone, enabling the generation of inert slag for landfill disposal and to ensure clean syngas. Designing these components entails considerations of sludge composition, calorific power, thermal conductivity, ash diameter, and fusibility properties, among other parameters. Accordingly, this work entails the development of an experimental setup for the plasma gasification of sewage sludge, taking into account a comprehensive sludge characterization. The experimental findings reveal that domestic WWT sewage sludge with 40% humidity exhibits a low thermal conductivity of approximately 0.392 W/mK and a calorific value of LHV = 20.78 MJ/kg. Also, the relatively low ash content (17%) renders this raw material advantageous for plasma gasification processes. The integration of a detailed sludge characterization into the equipment design lays the foundation for efficient syngas production. This study aims to contribute to advancing sustainable waste-to-energy technologies, namely plasma gasification, by leveraging sewage sludge as a valuable resource for syngas production.

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Section: Thermal Propertiesmentioning

confidence: 99%

Sewage Sludge Plasma Gasification: Characterization and Experimental Rig Design

Pacheco,

Ribeiro,

Oliveira

et al. 2024

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“…The aim of this study is to assess the ability of quasi-active thermography to detect underside non-surface-penetrating defects lying over various substrates. In the present experimental work, garden soil was used to simulate scum because its relevant properties (i.e., density, thermal conductivity, and specific heat) are similar to those of solid scum, as summarised in Table 4 , where the thermal diffusivities of each material can be calculated through the given density, thermal conductivity, and specific heat [ 27 , 28 , 29 , 30 , 31 , 32 ]. Therefore, the membrane in this experiment was placed in contact with soil, water, and air to mimic, respectively, contact with scum, sewage, and biogas in the treatment plant.…”

Section: Ir Thermography Inspection Of Hdpe Geomembranesmentioning

confidence: 99%

Detection of Defects in Geomembranes Using Quasi-Active Infrared Thermography

Rose

Wong

et al. 2021

Sensors

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High-density polyethylene geomembranes are employed as covers for the sewage treatment lagoons at Melbourne Water Corporation’s Western Treatment Plant, to harvest the biogas produced during anaerobic degradation, which is then used to generate electricity. Due to its size, inspecting the cover for defects, particularly subsurface defects, can be challenging, as well as the potential for the underside of the membrane to come into contact with different substrates, viz. liquid sewage, scum (consolidated solid matter), and biogas. This paper presents the application of a novel quasi-active thermography inspection method for subsurface defect detection in the geomembrane. The proposed approach utilises ambient sunlight as the input thermal energy and cloud shading as the trigger for thermal transients. Outdoor laboratory-scale experiments were conducted to study the proposed inspection technique. A pyranometer was used to measure the intensity of solar radiation, and an infrared thermal camera was used to measure the surface temperature of the geomembrane. The measured temperature profile was analysed using three different algorithms for thermal transient analysis, based on (i) the cooling constant from Newton’s law of cooling, (ii) the peak value of the logarithmic second derivative, and (iii) a frame subtraction method. The outcomes from each algorithm were examined and compared. The results show that, while each algorithm has some limitations, when used in combination the three algorithms could be used to distinguish between different substrates and to determine the presence of subsurface defects.

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“…The experiments described in Section 2.1 used clayey soil since it is reported that clayey soil has similar density [28,29], thermal conductivity [30,31] and specific heat [32,33] as scumbergs. The thermal properties of each material are summarised in Table 5.…”

Section: Finite Element Modelmentioning

confidence: 99%

Thermographic Monitoring of Scum Accumulation beneath Floating Covers

Rose

Wong

et al. 2021

Remote Sensing

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Large sheets of high-density polyethene geomembrane are used as floating covers on some of the wastewater treatment lagoons at the Melbourne Water Corporation’s Western Treatment Plant. These covers provide an airtight seal for the anaerobic digestion of sewage and allow for harvesting the methane-rich biogas, which is then used to generate electricity. There is a potential for scum to develop under the covers during the anaerobic digestion of the raw sewage by microorganisms. Due to the nature of the operating environment of the lagoons and the vast size (450 m × 170 m) of these covers, a safe non-contact method to monitor the development and movement of the scum is preferred. This paper explores the potential of using a new thermographic approach to identify and monitor the scum under the covers. The approach exploits naturally occurring variations in solar intensity as a trigger for generating a transient thermal response that is then fitted to an exponential decay law to determine a cooling constant. This approach is investigated experimentally using a laboratory-scale test rig. A finite element (FE) model is constructed and shown to reliably predict the experimentally observed thermal transients and cooling constants. This FE model is then set up to simulate progressive scum accumulation with time, using a specified scumberg geometry and a stepwise change in thermal properties. The results indicate a detectable change in the cooling constant at different locations on the cover, thereby providing a quantitative basis for characterising the scum accumulation beneath the cover. The practical application and limitations of these results are briefly discussed.

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Thermal conductivity characteristics of dewatered sewage sludge by thermal hydrolysis reaction

Cited by 9 publications

References 14 publications

Sewage Sludge Plasma Gasification: Characterization and Experimental Rig Design

Sewage Sludge Plasma Gasification: Characterization and Experimental Rig Design

Detection of Defects in Geomembranes Using Quasi-Active Infrared Thermography

Thermographic Monitoring of Scum Accumulation beneath Floating Covers

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