Inhibiting effect of textile wastewater on the activity of sludge from the biological treatment process of the activated sludge plant |
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Authors: | L. Gebrati M. El Achaby H. Chatoui M. Laqbaqbi J. El Kharraz F. Aziz |
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Affiliation: | 1. Materials, Process, Environment and Quality Laboratory, Ecole Nationale des Sciences Appliquées de Safi (ENSAS), University Cadi Ayyad, Marrakech, Morocco;2. National Centre for Research and Study on Water and Energy (CNEREE), University Cadi Ayyad, Marrakech, Morocco;3. Materials Science and Nanoengineering (MSN) Department, Mohammed 6 Polytechnic University (UM6P), Benguerir, Morocco;4. Private University of Marrakesh(UPM), 42312 Marrakech Morocco;5. Laboratory of Materials Engineering and Environment, Department of Chemistry, Faculty of Sciences Dhar El Mehraz, Fez, Morocco;6. MEDRC Water Research, P.C. 133, Al Khuwair, Oman;7. Laboratory of Hydrobiology, Ecotoxicology, Sanitation and Global Change (LHEAC, URAC33), Faculty of Sciences Semlalia, Morocco |
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Abstract: | Textile industry represents an important source of toxic substances rejected in environment. Indeed, effluent of these industries contains dyes and chemicals. They are rejected in environment without any treatment. The aim of this work is to evaluate ecotoxicological effect of industrial textile effluents on the sludge harvested from activated sludge treatment plant of Marrakech city (Morocco). For this, we are interested in determining the inhibition condition that corresponds to 50% decrease of bacterial activity in sludge. Obtained results showed that inhibition percentage of bacterial activity depends narrowly on contact time and on added effluent volume, until a limit concentration where there is no degradation of substratum. In fact, substratum degradation speed shows about 65 times decrease when 80% (v/v) of textile wastewater is added, in comparison with the controlled one. Consequently the inhibition constant (Ki) that corresponds to 50% of bacterial inhibition activity is estimated to 0.65 mg l?1 of dye. These studies confirm a real ecotoxicological risk of these effluents. Therefore, a treatment is mandatory before their rejection in environment. |
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Keywords: | Corresponding author at: Laboratory of Hydrobiology, Ecotoxicology, Sanitation and Global Change (LHEAC, URAC33), Faculty of Sciences Semlalia, Morocco. Inhibition Textile wastewater Bacterial activity Activated sludge |
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