Article: Investigation of methylene blue adsorption on alum sludge using full factorial 2k design Journal: International Journal of Environment and Waste Management (IJEWM) 2024 Vol.35 No.2 pp.151 - 164 Abstract: Alum sludge (AS) wasted from water treatment plant (WTP) was prepared by a simple drying method and tested as an adsorbent for removal of methylene blue (MB) dye from water. Laboratory batch experiment was conducted using full factorial 2k experimental design in order to investigate the influence of experimental factors including adsorbent dose (0.5-1 g/L), dye concentration (0.05-0.15 g/L), pH (4-8), and temperature (30-60°C). Characterisation of AS adsorbent was performed using SEM-EDX and XRF analysis. SEM-EDX and XRF analysis showed that AS particles have a heterogeneous size, with irregular shape and rough surface, and contains SiO2, Fe2O3 and Al2O3. Results showed that all experimental factors affected the dye removal and adsorbent dosage was found as the most significant factor. The highest removal up to 75% in 3 hours can be achieved at adsorbent dosage of 1 g/L, dye concentration 50 mg/L, pH 8, and temperature 60°C. Inderscience Publishers - linking academia, business and industry through research

Title: Investigation of methylene blue adsorption on alum sludge using full factorial 2^k design

Authors: Sandyanto Adityosulindro; Fairuz Nabila; Annisa Marlin M. Rus; Djoko M. Hartono; Setyo S. Moersidik

Addresses: Environmental Engineering Study Program, Department of Civil Engineering, Universitas Indonesia, 16424, Depok, Indonesia ' Environmental Engineering Study Program, Department of Civil Engineering, Universitas Indonesia, 16424, Depok, Indonesia ' Department of Industrial Engineering, Universitas Indonesia, 16424, Depok, Indonesia ' Environmental Engineering Study Program, Department of Civil Engineering, Universitas Indonesia, 16424, Depok, Indonesia ' Environmental Engineering Study Program, Department of Civil Engineering, Universitas Indonesia, 16424, Depok, Indonesia

Abstract: Alum sludge (AS) wasted from water treatment plant (WTP) was prepared by a simple drying method and tested as an adsorbent for removal of methylene blue (MB) dye from water. Laboratory batch experiment was conducted using full factorial 2^k experimental design in order to investigate the influence of experimental factors including adsorbent dose (0.5-1 g/L), dye concentration (0.05-0.15 g/L), pH (4-8), and temperature (30-60°C). Characterisation of AS adsorbent was performed using SEM-EDX and XRF analysis. SEM-EDX and XRF analysis showed that AS particles have a heterogeneous size, with irregular shape and rough surface, and contains SiO₂, Fe₂O₃ and Al₂O₃. Results showed that all experimental factors affected the dye removal and adsorbent dosage was found as the most significant factor. The highest removal up to 75% in 3 hours can be achieved at adsorbent dosage of 1 g/L, dye concentration 50 mg/L, pH 8, and temperature 60°C.

Keywords: adsorption; alum sludge; sludge reuse; methylene blue; full factorial design.

DOI: 10.1504/IJEWM.2024.141622

International Journal of Environment and Waste Management, 2024 Vol.35 No.2, pp.151 - 164

Received: 29 Jan 2021
Accepted: 20 Apr 2022
Published online: 27 Sep 2024 *

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Title: Investigation of methylene blue adsorption on alum sludge using full factorial 2k design

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Title: Investigation of methylene blue adsorption on alum sludge using full factorial 2^k design