Assessing the economic suitability of aeration and the influence of bed heating on constructed wetlands treatment efficiency and life-span

Labella, A., Caniani, D., Hughes-Riley, T. ORCID: 0000-0001-8020-430X, Morris, R.H. ORCID: 0000-0001-5511-3457, Newton, M.I. ORCID: 0000-0003-4231-1002, Hawes, P., Puigagut, J., García, J. and Uggetti, E., 2015. Assessing the economic suitability of aeration and the influence of bed heating on constructed wetlands treatment efficiency and life-span. Ecological Engineering, 83, pp. 184-190. ISSN 0925-8574

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Abstract

Intensive constructed wetlands including forced aeration and heating were studied to improve treatment efficiency and prevent clogging. The experiments were carried out in a pilot plant (0.4 m2) treating urban wastewater with an organic loading rate of 40-60 gCOD/m2∙d. Continuous and intermittent aeration was performed on 8% of the wetland surface, leading to different dissolved oxygen concentrations within the wetlands (from 0.2 to 5 mgO2/L). Continuous forced aeration increased organic matter (COD) and ammonium nitrogen removal by 56% and 69%, respectively. Improvements in 33 wastewater treatment caused by forced aeration can result into reduction of the surface area. This work demonstrated that for the studied configuration the cost of the power consumption of the continuous aeration was largely covered by the reduction of the wetlands surface. Even if the heating of 8% of the wetland surface at 21°C had no effects on treatment performances, positive results showed that solids accumulation rate within the granular medium, which is closely related to the development of clogging. It has been demonstrated that heating for 10 days per year during 20 year period would delay the equivalent of 1 year of solids accumulation.

Item Type: Journal article
Alternative Title: Aeration and heating to improve treatment efficiency and delay clogging development of intensified experimental constructed wetlands
Publication Title: Ecological Engineering
Creators: Labella, A., Caniani, D., Hughes-Riley, T., Morris, R.H., Newton, M.I., Hawes, P., Puigagut, J., García, J. and Uggetti, E.
Publisher: Elsevier
Place of Publication: Amsterdam, Netherlands
Date: 2015
Volume: 83
ISSN: 0925-8574
Identifiers:
NumberType
10.1016/j.ecoleng.2015.06.028DOI
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 09:52
Last Modified: 09 Jun 2017 13:13
URI: http://irep.ntu.ac.uk/id/eprint/4077

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