Journal of Environmental Biology

Assessment of the toxicity of waste water from a textile

industry to Cyprinus carpio

Author Details

H. Roopadevi

Department of Environmental Science, Bangalore University, Bangalore - 560 056, India

R.K. Somashekar

(Corresponding author)

Department of Environmental Science, Bangalore University, Bangalore - 560 056, India

e-mail: h.roopadevi@gmail.com

Publication Data

Paper received:

1 October 2010

Revised received:

10 December 2010

Accepted:

21 April 2011

Abstract

Static, short-term, acute toxicity tests were performed over a period of 96 hrs using different concentrations of influent and effluent of textile industry waste water with the objective of evaluating their acute toxicity on fresh water fish, Cyprinus carpio (common carp).? The LC₅₀ 24, 48, 72 and 96 hr of influent and effluent were 25.9, 21.10, 15.66, 11.11% (v/v) and 63.18, 54.89, 48.62, 36.04% (v/v),? respectively.? The acute toxic unit TUa values for 24, 48, 72, 96 hr for influent and effluent are 3.85, 4.73, 6.38, 8.99 and 1.58, 1.82, 2.05, 2.77, respectively.? Correspondingly, the TF was found to be 1, 1.22, 1.65 and 2.33 for influent, and for effluent 1, 1.15, 1.29 and 1.75. Total efficiency of the treatment was 69.16% and the safe concentration of effluent is set to be 3.60%. These data are highly useful in establishing limits of acceptability by the aquatic animals. The need to introduce toxicity evaluation assay for confirming the quality of effluent from the point view of effective environmental safe limits and to ensure integrity of aquatic environment, is stressed.

Key words

Cyprinus carpio, Toxicity evaluation, Textile effluent, Toxicity factor, Acute toxic unit

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