Intermittent aeration to improve wastewater treatment efficiency in pilot-scale constructed wetland

Uggetti, E., Hughes-Riley, T. ORCID: 0000-0001-8020-430X, Morris, R.H. ORCID: 0000-0001-5511-3457, Newton, M.I. ORCID: 0000-0003-4231-1002, Trabi, C.L., Hawes, P., Puigagut, J. and García, J., 2016. Intermittent aeration to improve wastewater treatment efficiency in pilot-scale constructed wetland. Science of The Total Environment, 559, pp. 212-217. ISSN 0048-9697

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Forced aeration of horizontal subsurface flow constructed wetlands (HSSF CWs) is nowadays a recognized method to improve treatment efficiency, mainly in terms of ammonium removal. While numerous investigations have been reported testing constant aeration, scarce information can be found about the efficiency of intermittent aeration. This study aims at comparing continuous and intermittent aeration, establishing if there is an optimal regime that will increase treatment efficiency of HSSF CWs whilst minimizing the energy requirement. Full and intermittent aeration were tested in a pilot plant of three HSSF CWs (2.64 m2 each) fed with primary treated wastewater. One unit was fully aerated; one intermittently aerated (i.e. by setting a limit of 0.5 mg/L dissolved oxygen within the bed) with the remaining unit not aerated as a control. Results indicated that intermittent aeration was the most successful operating method. Indeed, the coexistence of aerobic and anoxic conditions promoted by the intermittent aeration resulted in the highest COD (66%), ammonium (99%) and total nitrogen (79%) removals. On the other hand, continuous aeration promotes ammonium removal (99%), but resulted in nitrate concentrations in the effluent of up to 27 mg/L. This study demonstrates the high potential of the intermittent aeration to increase wastewater treatment efficiency of CWs providing an extreme benefit in terms of the energy consumption.

Item Type: Journal article
Publication Title: Science of The Total Environment
Creators: Uggetti, E., Hughes-Riley, T., Morris, R.H., Newton, M.I., Trabi, C.L., Hawes, P., Puigagut, J. and García, J.
Publisher: Elsevier
Date: 8 April 2016
Volume: 559
ISSN: 0048-9697
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 14 Apr 2016 14:31
Last Modified: 08 Apr 2018 03:00

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