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Toxicity of High Salinity Tannery Wastewater and Effects on Constructed Wetland Plants

The toxicity of high salinity tannery wastewater produced after an activated sludge secondary treatment on the germination and seedling growth of Trifolium pratense, a species used as indicator in toxicity tests, was evaluated. Growth was inhibited by wastewater concentrations >25% and undiluted...

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Published in:International journal of phytoremediation 2012-08, Vol.14 (7), p.669-680
Main Authors: Calheiros, Cristina S. C, Silva, Gabriela, Quitério, Paula V. B, Crispim, Luís F. C, Brix, Hans, Moura, Sandra C, Castro, Paula M. L
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description The toxicity of high salinity tannery wastewater produced after an activated sludge secondary treatment on the germination and seedling growth of Trifolium pratense, a species used as indicator in toxicity tests, was evaluated. Growth was inhibited by wastewater concentrations >25% and undiluted effluent caused a complete germination inhibition. Constructed wetlands (CWs) with Arundo donax or Sarcocornia fruticosa were envisaged to further polish this wastewater. Selection of plant species to use in CWs for industrial wastewater treatment is an important issue, since for a successful establishment they have to tolerate the often harsh wastewater composition. For that, the effects of this wastewater on the growth of Arundo and Sarcocornia were assessed in pot assays. Plants were subject to different wastewater contents (0/50/100%), and both were resilient to the imposed conditions. Arundo had higher growth rates and biomass than Sarcocornia and may therefore be the preferred species for use in CWs treating tannery wastewater. CWs planted with the above mentioned plants significantly decreased the toxicity of the wastewater, as effluent from the CWs outlet stimulated the growth of Trifolium at concentrations
doi_str_mv 10.1080/15226514.2011.619233
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identifier ISSN: 1549-7879
ispartof International journal of phytoremediation, 2012-08, Vol.14 (7), p.669-680
issn 1549-7879
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source Taylor and Francis Science and Technology Collection
subjects activated sludge
Arundo
Arundo donax
Biodegradation, Environmental
biomass
constructed wetlands
Effluents
Germination
growth retardation
Industrial Waste - analysis
Industrial wastewater
Leather industry
Plant Development
Plant growth
planting
Plants (organisms)
Plants - drug effects
Plants - metabolism
Salinity
Sarcocornia fruticosa
seed germination
seedling growth
Seeds - drug effects
Sewage - chemistry
Sludge
Sodium Chloride - chemistry
Sodium Chloride - toxicity
Tanneries
Tanning
Time Factors
Toxicity
Toxicity test with plants
toxicity testing
Trifolium
Trifolium pratense
Waste Disposal, Fluid - methods
Waste water
wastewater
Wastewater treatment
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - toxicity
Water treatment
wetland plants
Wetlands
title Toxicity of High Salinity Tannery Wastewater and Effects on Constructed Wetland Plants
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