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High rate nitrogen removal in an alum sludge-based intermittent aeration constructed wetland
Author(s)
Date Issued
2012-03-16
Date Available
2013-03-16T04:00:14Z
Abstract
A new development on treatment wetland technology for the purpose of achieving high rate nitrogen removal from high strength wastewater has been made in this study. The laboratory scale alum sludge-based intermittent aeration constructed wetland (AlS-IACW) was integrated with predenitrification, intermittent aeration, and step-feeding strategies. Results obtained from 280 days of operation have demonstrated extraordinary nitrogen removal performance with mean total nitrogen (TN) removal efficiency of 90% under high N loading rate (NLR) of 46.7 g N m–2 d–1. This performance was a substantial improvement compared to the reported TN removal performance in literature. Most significantly, partial nitrification and simultaneous nitrification denitrification (SND) via nitrite was found to be the main nitrogen conversion pathways in the AlS-IACW system under high dissolved oxygen concentrations (3–6 mg L–1) without specific control. SND under high dissolved oxygen (DO) brings high nitrogen conversion rates. Partial nitrification and SND via nitrite can significantly reduce the demand for organic carbon compared with full nitrification and denitrification via nitrate (up to 40%). Overall, these mechanisms allow the system to maintaining efficient and high rate TN removal even under carbon limiting conditions.
Other Sponsorship
Department of Agriculture, Fisheries and Food under the Research Stimulus Fund (project no. RSF 07-529)
Type of Material
Journal Article
Publisher
ACS
Journal
Environmental Science &Technololgy
Volume
46
Issue
8
Start Page
4583
End Page
4590
Copyright (Published Version)
2012 American Chemical Society
Keywords
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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