Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 10, Pages 2830-2836Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.04.016
Keywords
Adsorption capacity; Engineered wetlands; Water treatment residual; Phosphorus removal; Wastewater treatment
Categories
Funding
- Irish Environmental Protection Agency [2005-ET-MS-38-M3]
- Environmental Protection Agency Ireland (EPA) [2005-ET-MS-38-M3] Funding Source: Environmental Protection Agency Ireland (EPA)
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Aluminium-based water treatment residual (Al-WTR) is the most widely generated residual from water treatment facilities worldwide. It is regarded as a by-product of no reuse potential and landfilled. This study assessed Al-WTR as potential phosphate-removing substrate in engineered wetlands. Results indicate specific surface area ranged from 28.0 m(2) g(-1) to 41.4 m(2) g(-1). X-ray Diffraction, Fourier transform infrared and energy-dispersive X-ray spectroscopes all indicate Al-WTR is mainly composed of amorphous aluminium which influences its phosphorus (P) adsorption capacity. The pH and electrical conductivity ranged from 5.9 to 6.0 and 0.104 dS m(-1) to 0.140 dS m(-1) respectively, showing that it should support plant growth. Batch tests showed adsorption maxima of 31.9 mg P g(-1) and significant P removal was achieved in column tests. Overall, results showed that Al-WTR can be used for P removal in engineered wetlands and it carries the benefits of reuse of a by-product that promotes sustainability. (C) 2009 Elsevier Ltd. All rights reserved.
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