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J Environ Manage. 2013 Oct 15;128:912-9. doi: 10.1016/j.jenvman.2013.06.045. Epub 2013 Jul 24.

Effect of influent aeration on removal of organic matter from coffee processing wastewater in constructed wetlands.

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  • 1Universidade Federal de Viçosa, Departamento de Engenharia Agrícola, Av. Peter Henry Rolfs, s/n, Campus Universitário, CEP 36570-000 Viçosa, Minas Gerais, Brazil. maike.rossmann@ufv.br

Abstract

The aim of the present study was to evaluate the influence of aeration and vegetation on the removal of organic matter in coffee processing wastewater (CPW) treated in 4 constructed wetlands (CWs), characterized as follows: (i) ryegrass (Lolium multiflorum) cultivated system operating with an aerated influent; (ii) non-cultivated system operating with an aerated influent, (iii) ryegrass cultivated system operating with a non-aerated influent; and (iv) non-cultivated system operating with a non-aerated influent. The lowest average chemical oxygen demand (COD), biochemical oxygen demand (BOD) and total suspended solids (TSS) removal efficiencies of 87, 84 and 73%, respectively, were obtained in the ryegrass cultivated system operating with a non-aerated influent. However, ryegrass cultivation did not influence the removal efficiency of organic matter. Artificial aeration of the CPW, prior to its injection in the CW, did not improve the removal efficiencies of organic matter. On other hand it did contribute to increase the instantaneous rate at which the maximum COD removal efficiency was reached. Although aeration did not result in greater organic matter removal efficiencies, it is important to consider the benefits of aeration on the removal of the other compounds.

Copyright © 2013 Elsevier Ltd. All rights reserved.

KEYWORDS:

Aeration; Agro-industrial effluent; Coffee; Horizontal flow; Treatment wetland

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