Treatment of dyes used as insect proofing containing textile effluents including persistent organochlorine by chemical coagulants. | [Pakistan Journal of Entomology • 2010]

Author(s):

1. M. Azhar Khan: Institute of Environmental Studies, University of Karachi, Karachi, Pakistan

2. Omm-E-Hany: Institute of Environmental Studies, University of Karachi, Karachi, Pakistan

3. Jehanzeb Abdul-Wahid: Institute of Environmental Studies, University of Karachi, Karachi, Pakistan

4. Moazzam Ali Khan: Institute of Environmental Studies, University of Karachi, Karachi, Pakistan

5. Tahir Anwar: Pesticide Research Institute, Southern Zone Agricultural Research Center, Pakistan Agricultural Research Council (PARC), Karachi University Campus, Karachi, Pakistan

6. Imtiaz Ahmad: M.A.H Qadri Biological Research Centre, University of Karachi, Karachi, Pakistan

7. Seema Tahir: Department of Zoology, University of Karachi, Karachi, Pakistan

Abstract:

In this investigation, chemical coagulation was employed to treat wastewater from textile industry containing dyes often with moth proofing persistent toxic chemicals. Three coagulants were tested, ferric chloride, ferrous sulfate and aluminum sulfate. Ferric chloride failed to perform effectively as a coagulant; the other two coagulants were fairly effective. Results show that high amount of ferrous sulfate plus lime was not always suited for COD removal in the wastewater treatment, while high extent of alum or alum plus lime were helpful for high flocculating effects. It was found that maximum COD removal was achieved by the use of alum and alum plus lime. However, compared with ferrous sulfate plus lime, alum or alum plus lime can easily reach high COD removal efficiency below coagulant dose 1.0g or 0.4 g/L. Also, for TSS removal, it was noted that maximum TSS remova` were achieved by use of coagulants in combination of alum plus lime (91 %), thus from economic view point, alum or alum with lime is more suitable for the treatment of wastewater effluent from textile industry containing dyes.

Page(s): 15-20

DOI: DOI not available

Published: Journal: Pakistan Journal of Entomology, Volume: 25, Issue: 1, Year: 2010

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