The treatment of tannery wastewater has been a very important issue for pollution
control in leather producing countries due to its high pollutant content. Biological
processes offer a natural way of treating wastewaters, when compared to more
aggressive types of treatment. Constructed wetlands can be an alternative to more
conventional biological treatment systems. The species Phragmites australis, Typha spp,
Scirpus spp. and Phalaris arundinacea are some of the plants frequently used in
subsurface flow constructed wetlands.
The present study aimed at assessing the performance of constructed wetland systems
operating in series for the treatment of wastewater derived from a tannery plant. Pilot
units were operated with horizontal subsurface flow and planted with Typha latifolia and
Phragmites australis in an expanded clay matrix. They were subject to two different
hydraulic loadings: 180mm/d and 60 mm/d.
For an hydraulic loading of 180 mm/d, maximum removal efficiencies of 2100
KgCOD/had (48%) were achieved for unit 1 and 1500 KgCOD/had (33%) for unit 2. For
an hydraulic loading of 60 mm/d, maximum removal efficiencies of 360 KgCOD/had
(66%) were achieved for unit 1 and of 250 KgCOD/had (60%) for unit 2. No significant
differences in performance were found between units with different plant species
