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Advisor(s)
Abstract(s)
Wastewaters from tannery industry are complex in composition and providing adequate treatment
can be difficult. Constructed wetlands (CW) are regarded as an alternative treatment
to the conventional biological systems, as a developing cost-effective and environmentally
friendly phytoremediation technology. The present review compiles and integrates information
on CWs technology for the needs of the tannery sector. The following issues arise as
crucial for the implementation of such systems, namely i) an accurate wastewater characterization
and an effective pretreatment before reaching the CW, ii) choosing the plants species
better adapted to the imposed conditions, iii) substrate selection and iv) range of organic
loadings applied. The examples practiced in Portugal give indication that horizontal subsurface
flow systems, with expanded clay media, are a suitable option to be considered when
dealing with high organic loading tannery wastewater (up to c.a. 3800 kgCODha−1d−1), being
resilient to a wide range of hydraulic variations. Plants such as Phragmites and Typha
have shown to be adequate for tannery wastewater depuration, with Arundo donax proving
resilient to high salinity wastewaters. The flexibility of implementation allows the CW to be
adapted to different sites with different configurations, being suitable as main secondary or
tertiary treatment stage.
Description
Keywords
Constructed wetland Tannery wastewater Phytoremediation Leather industry Wastewater treatment Portugal
Citation
CALHEIROS, Cristina, S. C.; RANGEL, António O. S. S.; CASTRO, Paula M. L. - Constructed wetlands for tannery wastewater treatment in Portugal: ten years of experience. International Journal of Phytoremediation. ISSN 1522-651416. Vol. 16 (2014), p. 859–870
Publisher
Taylor & Francis