Characterization of aluminium-based water treatment residual for potential phosphorus removal in engineered wetlands

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...

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Bibliographic Details
Published in:Environmental pollution (1987) 2009-10, Vol.157 (10), p.2830-2836
Main Authors: Babatunde, A.O., Zhao, Y.Q., Burke, A.M., Morris, M.A., Hanrahan, J.P.
Format: Article
Language:English
Subjects:
Adsorption
Adsorption capacity
Aluminum
Aluminum - chemistry
Applied sciences
Biological and medical sciences
Biological treatment of waters
Biotechnology
Byproducts
chemical residues
constructed wetlands
Engineered wetlands
Environment and pollution
Exact sciences and technology
extraction
Fundamental and applied biological sciences. Psychology
General purification processes
Industrial applications and implications. Economical aspects
phosphates
phosphorus
Phosphorus - chemistry
Phosphorus removal
physicochemical properties
Pollution
Reuse
sorption isotherms
Surface chemistry
Wastewater treatment
Wastewaters
Water Pollutants, Chemical - chemistry
water pollution
Water Purification - instrumentation
Water Purification - methods
Water Supply - analysis
Water treatment
Water treatment and pollution
Water treatment residual
Wetlands
X-rays
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Summary: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. Aluminium-based water treatment residual can be used for phosphorus removal in engineered wetlands!
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2009.04.016