Applied and Natural Science Foundation
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Journal of Applied and Natural Science
An International Journal | Print ISSN: 0974-9411 | Online ISSN: 2231-5209
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Journal of Applied and Natural Science 1(1):8-12(2009)
Bioassay evaluation of toxi City reduction in common effluent treatment plant
V. K. Tyagi1*, A. K. Chopra2, N. C. Durgapal3 and A. A. Kazmi1
1 Department of Civil Engineering, Indian Institute of Technology, Roorkee – 247667, INDIA
2 Department of Zoology and Environmental Science, Gurukula Kangri University, Haridwar-249404, INDIA
3 Central Pollution Control Board, Delhi – 110 032, INDIA
*Corresponding author. E-mail:
Abstract : This paper investigates the utility and validity of bioassay toxi City testing using Daphnia magna straus as test organism for monitoring the common effluent treatment plant (CETP) receiving both industrial as well as domestic effluent. The average daphnia toxi City (Gd) at inlet, after primary settling tank (PST), secondary settling tank (SST) and tertiary treatment unit were reported as Gd-16, Gd-12, Gd-4 and Gd-1 respectively. However, a cumulative percentage removal in toxi City after PST, SST and tertiary treatment units was observed as 25%, 75% and 100%, respectively, during entire study period. It showed that a complete removal in daphnia toxi City (Gd) i.e.100% had been achieved only after tertiary treatment unit involving Dual Media Filters followed by activated carbon filters. Further attempts have been made to establish the relationship between key wastewater constituents i.e. Chemical Oxygen Demand (COD) and Suspended Solids (SS) with respects to daphnia toxi City (Gd). It was observed that COD and SS show a statistically significant correlation (r2) with daphnia toxi City (Gd) i.e. 0.89 and 0.81, respectively. Thus COD and SS can serve as a regulatory tool in lieu of an explicit toxi City standard (to check and improve the operational status of wastewater treatment plants in time).

Keywords : Toxi City, CETP, Daphnia magna straus
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