Investigation on the efficiency of common effluent treatment plant on the reduction of textile effluent physicochemical parameters and toxicity
- 1PG and Research Department of Biotechnology, National College (Autonomous), Tiruchirappalli – 620001, Tamil Nadu, India
- 2Geobiotechnology Lab, PG and Research Department of Biotechnology, National College (Autonomous), Tiruchirappalli, Tamil Nadu, India
Int. Res. J. Environment Sci., Volume 6, Issue (12), Pages 1-8, December,22 (2017)
Textile industry effluent treated through different stages in Common Effluent Treatment Plant (CETP), Perundurai Region, Tamil Nadu, India, was analyzed for efficiency in reduction of effluent physicochemical parameters. The toxicity reduced in the treated effluent was tested using freshwater fish Labeo rohita through histopathological analysis. The untreated effluent showed lower fish 96hLC50 values of 10% indicating higher toxicity. The biological treatment of textile effluent (involving bacteria) followed in the CETP (Stage I) resulted in 90% decolourization of the effluent. Whereas, the biologically treated effluent resulted in lower fish 96hLC50 values of 50%. The chemical treatment process followed by biological treatment in the CETP increased the decolourization to 95%, along with subsequent increase in fish 96hLC50 values of 75%. Further treatment of the effluent through hydraulic press, chlorination, dual media filter press had resulted in total decolourization of the effluent to 97%, along with higher reduction in effluent physicochemical parameters and metal ions. Toxicity analysis revealed that the fish could only survive acute toxicity test due to partial reduction of toxicity in the treated effluent, hence unsuitable for its the release into natural water bodies. However the treated effluent with reduced effluent parameters after reverse osmosis can be reused further in textile processing. The total recovery of water after treatment was 85% respectively and the production of secondary sludge 1.4gL-1.
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