Environmental Sustainability of the Removal of Alpaca Fiber Dye Using a Thermally Modified Sludge from a Drinking Water Treatment Facility

Gilberto Colina Andrade (), Alberto Jiménez Orihuela, Annie Challco Hihui, Kevin Tejada Meza, Claudia Revilla Pacheco and Ruly Terán Hilares
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Gilberto Colina Andrade: Laboratorio de Materiales, Universidad Católica de Santa María (UCSM), Urb. San José, San José S/n, Yanahuara, Arequipa 04000, Peru
Alberto Jiménez Orihuela: Laboratorio de Materiales, Universidad Católica de Santa María (UCSM), Urb. San José, San José S/n, Yanahuara, Arequipa 04000, Peru
Annie Challco Hihui: Laboratorio de Materiales, Universidad Católica de Santa María (UCSM), Urb. San José, San José S/n, Yanahuara, Arequipa 04000, Peru
Kevin Tejada Meza: Laboratorio de Materiales, Universidad Católica de Santa María (UCSM), Urb. San José, San José S/n, Yanahuara, Arequipa 04000, Peru
Claudia Revilla Pacheco: Laboratorio de Materiales, Universidad Católica de Santa María (UCSM), Urb. San José, San José S/n, Yanahuara, Arequipa 04000, Peru
Ruly Terán Hilares: Laboratorio de Materiales, Universidad Católica de Santa María (UCSM), Urb. San José, San José S/n, Yanahuara, Arequipa 04000, Peru

Sustainability, 2024, vol. 16, issue 18, 1-25

Abstract: In this work, the removal of dye using thermally modified sludge from a drinking water treatment facility (DWTS) was evaluated. This study gives value to the waste from the coagulation flocculation process (waste sludge) in order to remove an emerging organic agent (Bordeaux B). The sustainability of the process leads to a circular economy, which represents an important environmental contribution. The physicochemical characterization of the DWTS was carried out by standard methods. DRX and FTIR spectroscopy, SEM, and superficial specific area S BET N 2 at 77 K were used. Thermal activation processes were carried out (200–600 °C) to obtain the best activated thermal conditions for dye removal (T: 500 °C). Muscovite and other minerals were found in the DWTS. Experimental conditions (batch mode) were determined: contact time (CT), pH, adsorbent dose (AD), and dye initial concentration (Co). S BET = 54.77 and 67.90 m 2 /g by DWTS and TA-500. The best removal efficiency was achieved at 500 °C (R = 85.57 ± 0.76 %, q max = 37.45 ± 0.14 mg/g), which, compared to other unconventional adsorbents, is more reliable and competitive. The adsorption process was adjusted to the Langmuir mathematics model, following pseudo-second-order kinetics (R 2 = 0.99).

Keywords: adsorption; anionic dyes; thermally activated; sustainable sludge (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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