Constructed wetlands using aluminium-based drinking water treatment sludge as P-removing substrate : should aluminium release be a concern?
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|Title:||Constructed wetlands using aluminium-based drinking water treatment sludge as P-removing substrate : should aluminium release be a concern?||Authors:||Babatunde, A.O.
|Permanent link:||http://hdl.handle.net/10197/3108||Date:||Jun-2011||Online since:||2011-08-26T14:13:59Z||Abstract:||This study investigated an important issue of aluminium (Al) release in a novel reuse of Al-based water treatment sludge (Al-WTS) in constructed wetland system (CWs) as alternative substrate for wastewater treatment. Al-WTS is an inevitable by-product of drinking water treatment plants that use Al-salt as coagulant for raw water purification. It has recently been demonstrated that Al-WTS can be reused as a low-cost phosphorus (P) adsorbent and biofilm carrier in CWs for wastewater treatment. However, to facilitate the large scale application of Al-WTS in CWs as wetland substrate, concerns about Al leaching during its’ reuse in CWs must be addressed as Al is a dominant constituent in Al-WTS. In this study, a desk review of literature on Al release during Al-WTS reuse was conducted. Furthermore, a 42-week Al monitoring was carried out on a pilot field-scale CWs employing Al-WTS as main substrate. Results show that 22 out of the 35 studies reviewed, reported Al release with levels of soluble Al reported ranging from 0.01 to about 20 mg L-1. Monitoring of Al in the pilot field-scale CWs shows that there was Al leaching. However, except for the first three weeks of operation, effluents concentrations of both total- and soluble-Al were all below the general regulatory guideline limit of 0.2 mg L-1. Overall, the study addresses a very vital concern regarding the successful application of Al-WTS in CWs and shows that Al release during such novel reuse is quite low and should not preclude its use.||Funding Details:||Other funder||Type of material:||Journal Article||Publisher:||RSC Publishing||Journal:||Journal of Environmental Monitoring||Volume:||13||Issue:||6||Start page:||1775||End page:||1783||Copyright (published version):||Royal Society of Chemistry 2011||Keywords:||Aluminium; Alum sludge; Constructed wetlands; Leaching; Water treatment sludge; Wastewater treatment||Subject LCSH:||Aluminum
Water treatment plant residuals
|DOI:||10.1039/C1EM00001B||Other versions:||http://dx.doi.org/10.1039/C1EM00001B||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Urban Institute Ireland Research Collection|
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection
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