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Engenharia Sanitaria e Ambiental

versão impressa ISSN 1413-4152versão On-line ISSN 1809-4457

Resumo

COSTA, Renan de Almeida; MATOS, Mateus Pimentel de; MATOS, Antonio Teixeira de  e  SPERLING, Marcos Von. Hydrodynamic behavior of horizontal subsurface flow constructed wetlands with different aspect ratio and operation time. Eng. Sanit. Ambient. [online]. 2019, vol.24, n.1, pp.83-91.  Epub 25-Abr-2019. ISSN 1809-4457.  https://doi.org/10.1590/s1413-41522019175103.

The objective of the present work was to evaluate the geometric ratio and the operating time’s influence on the systems’ hydrodynamic conditions. For this purpose, three horizontal subsurface flow constructed wetlands (HSSF-CWs) in pilot scale, with same useful volume () but with different length:width (L/B) ratio, were characterized regarding the hydrodynamic behavior at the beginning and after 3 months of operation, in sewage treatment. To obtain the HSSF-CW conditions, the stimulus-response technique with the lithium chloride (LiCl) tracer injection on a pulse format was used. Thus, the residence time distribution curve was constructed, from which parameters were extracted and enabled the hydrodynamic analysis of the systems. It was found that all HSSF-CWs presented dispersed hydrodynamic behavior, although the results indicated an inverse correlation between L/B and the dispersion number. The operating time of these systems provided a reduction in the dispersion number in all HSSF-CWs, different from the results found in some works.

Palavras-chave : constructed wetlands; reactors hydrodynamics; lithium chloride; dispersion number..

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