A comparative evaluation of dried activated sludge and mixed dried activated sludge with rice husk silica to remove hydrogen sulfide

• Published in: Iranian journal of environmental health science & engineering Vol. 10; no. 1; pp. 22 - 1
• Main Authors: Mehdinia, Seyed Mahmoud, Latif, Puziah Abdul, Taghipour, Hassan
• Format: Journal Article
• Language: English
• Published: London BioMed Central 12.03.2013; BioMed Central Ltd; Dr Ali Akbari Sari, Director of The Commission for Accreditation & Improvement of Iranian Medical Journals
• Subjects: Dimethyl sulfide; Earth and Environmental Science; Environment; Environmental aspects; Environmental Economics; Environmental Engineering/Biotechnology; Environmental Health; Environmental Law/Policy/Ecojustice; Equipment and supplies; Hydrogen sulfide; Laboratories; Laboratory equipment; Oryza sativa; Quality of Life Research; Research Article; Silica; Sludge; Studies; Sulfur compounds; Waste Management/Waste Technology; Water pollution; Water treatment; Iran; Hydrogen sulphide; Rice husk silica; Removal efficiency; Elimination capacity Pressure drop; Dried activated sludge
• ISSN: 1735-1979; 1735-2746; 1735-2746
• DOI: 10.1186/1735-2746-10-22

The aim of this study was to investigate the effectiveness of dried activated sludge (DAS) and mixed dried activated sludge with rice husk silica (DAS & RHS) for removal of hydrogen sulfide (H 2 S). Two laboratory-scale filter columns (packed one litter) were operated. Both systems were operated under different conditions of two parameters, namely different inlet gas concentrations and different inlet flow rates. The DAS & RHS packed filter showed more than 99.96% removal efficiency (RE) with empty bed residence time (EBRT) of 45 to 90 s and 300 mg/L inlet concentration of H 2 S. However, the RE decreased to 96.87% with the EBRT of 30 s. In the same condition, the DAS packed filter showed 99.37% RE. Nonetheless, the RE was shown to have dropped to 82.09% with the EBRT of 30 s. The maximum elimination capacity (EC) was obtained in the DAS & RHS packed filter up to 52.32 g/m 3 h, with the RE of 96.87% and H 2 S mass loading rate of 54 g/m 3 h. The maximum EC in the DAS packed filter was obtained up to 44.33 g/m 3 h with the RE of 82.09% and the H 2 S mass loading rate of 54 g/m 3 h. After 53 days of operating time and 54 g/m 3 h of loading rates, the maximum pressure drop reached to 3.0 and 8.0 (mm H 2 O) for the DAS & RHS packed and DAS packed filters, respectively. Based on the findings of this study, the DAS & RHS could be considered as a more suitable packing material to remove H 2 S.