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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4913
Title: Effects of multi-metal toxicity on the performance of sewage treatment system during the festival of colors (Holi) in India
Authors: Tyagi V.K.
Bhatia A.
Gaur R.Z.
Khan A.A.
Ali M.
Khursheed A.
Kaza A.A.
Published in: Environmental Monitoring and Assessment
Abstract: The present study investigated the effects of heavy metals (Ni, Zn, Cd, Cu, and Pb) toxicity on the performance of 18 MLD activated sludge processbased sewage treatment plant (STP) during celebration of Holi (festival of colors in India). The composite sampling (n032) was carried out during the entire study period. The findings show a significant decrease in chemical oxygen demand removal efficiency (20%) of activated sludge system, after receiving the heavy metals laden wastewater. A significant reduction of 40% and 60% were observed in MLVSS/MLSS ratio and specific oxygen uptake rate, which eventually led to a substantial decrease in biomass growth yield (from 0.54 to 0.17). The toxic effect of metals ions was also observed on protozoan population. Out of the 12 mixed liquor species recorded, only two ciliates species of Vorticella and Epistylis exhibited the greater tolerance against heavy metals toxicity. Furthermore, activated sludge shows the highest metal adsorption affinity for Cu, followed by Zn, Pb, Ni, and Cd (Cu> Zn>Pb>Ni>5Cd). Finally, this study proves the robustness of activated sludge system against the sudden increase in heavy metal toxicity since it recovered the earlier good quality performance within 5 days. ¬© Springer Science+Business Media B.V. 2012.
Citation: Environmental Monitoring and Assessment(2012), 184(12): 7517-7529
URI: https://doi.org/10.1007/s10661-012-2516-1
http://repository.iitr.ac.in/handle/123456789/4913
Issue Date: 2012
Keywords: Activated sludge
Heavy metals toxicity
Holi
Protozoa
SOUR
ISSN: 1676369
Author Scopus IDs: 36776464800
44760896800
42661150500
7404909843
57214142508
7005362932
56110643200
Author Affiliations: Tyagi, V.K., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Bhatia, A., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Gaur, R.Z., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Khan, A.A., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Ali, M., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Khursheed, A., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Kaza, A.A., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Corresponding Author: Tyagi, V.K.; Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India; email: vinayiitrp@gmail.com
Appears in Collections:Journal Publications [CE]

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