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    BOD-DO modeling and water quality analysis of a waste water outfall off Kochi, west coast of India

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    Environ_Int_32_165.pdf (1019Kb)
    Date
    2006
    Author
    Babu, M.T.
    Das, V.K.
    Vethamony, P.
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    Abstract
    Water quality scenarios around an offshore outfall off Kochi were simulated using MIKE21 water quality model, assuming a high Biochemical Oxygen Demand (BOD=50 mgl sup(-1)) effluent discharge. The discharge is introduced into the model through an outfall located at a distance of 6.8 km from the shore at a depth of 10 m. Three scenarios were simulated with different discharge rates such as 2, 5 and 10 m sup(3) s sup(-1), with BOD load of 8640, 21,600 and 43,200 kg day sup(-1) respectively. Model simulations were carried out to estimate the assimilation capacity of the waters off Kochi for the three discharge rates. The results show that for 10 m sup(3) s sup(-1) effluent discharge, the initial BOD of 50 mg l sup(-1) reduced to 3.33 mg l sup(-1) at the outfall after 48 h. High BOD values were confined to an elliptical area of approx 8 km sup(2) around the outfall. Based on this, the assimilative capacity of the waters off Kochi in terms of BOD can be estimated as 38,000 kg day sup(-1). It is suggested that offshore waters could be used as a feasible alternative to the Kochi backwaters for the disposal of treated effluent
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    http://drs.nio.org/drs/handle/2264/852
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