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

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 mg l(-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 m3 s(-1), with BOD load of 8640, 21,600 and 43,200 kg day(-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 m3 s(-1) effluent discharge, the initial BOD of 50 mg l(-1) reduced to 3.33 mg l(-1) at the outfall after 48 h. High BOD values were confined to an elliptical area of approximately 8 km2 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(-1). It is suggested that offshore waters could be used as a feasible alternative to the Kochi backwaters for the disposal of treated effluent.

journal_name

Environ Int

journal_title

Environment international

authors

Babu MT,Das VK,Vethamony P

doi

10.1016/j.envint.2005.08.007

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

165-73

issue

2

eissn

0160-4120

issn

1873-6750

pii

S0160-4120(05)00179-0

journal_volume

32

pub_type

杂志文章

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