Measurement of Energetic Properties of Residual Sludge and Catalysts from the Textile, Tannery, and Galvanic Industries Using Differential Scanning Calorimetry
Author(s): Mulugeta T. Alemu¹ and Selamawit A. Tesfaye²
Affiliation: οΏ½ Addis Ababa University, Addis Ababa, Ethiopia οΏ½ Mekelle University, Mekelle, Ethiopia
Page No: 22-30-
Volume issue & Publishing Year: Volume 1 Issue 7,Dec-2024
Journal: International Journal of Modern Engineering and Management | IJMEM
ISSN NO: 3048-8230
DOI:
Abstract:
This study investigates the energetic properties of catalysts derived from residual sludge generated by the textile, galvanic, and tannery industries. The research involved an initial heat treatment to activate the catalytic properties, followed by thermal analysis using differential scanning calorimetry (DSC). This technique enabled the examination of the materials' thermal behavior over a temperature range of 142 to 550°C, under controlled heating rates and pressure conditions. The resulting data were used to construct specific heat models through polynomial regression, employing the least squares method. These models allowed for the estimation of variations in enthalpy and entropy for both the sludge and catalysts via integration. The specific heat models, primarily represented by third-degree polynomials, accurately depicted the thermal behavior of the samples, accounting for variations in their physicochemical properties. The catalysts from the textile industry showed the strongest statistical fit, while the catalysts from the galvanic industry exhibited notable consistency with bibliographic data across various temperature points. The specific heat (Cp) was determined as a function of temperature and used to estimate the enthalpy and entropy changes in the sludge and catalysts. The highest enthalpy values were observed for the sludge and catalysts from the tannery industry, with Cp values of 5.60 J/g-K at 603 K and 2.45 J/g-K at 445.6 K. The third-degree polynomial models were found to be the most effective, as they (1) accounted for variations in the physicochemical properties affecting Cp as a function of temperature, (2) provided superior statistical fit, and (3) aligned with existing literature data for the textile and galvanic industries.
Keywords:
Catalyst; Sewage Sludge; Differential Scanning Calorimetry; Specific Heat; Enthalpy; Entropy
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