Topic: : Study of problems of high Chemical Oxygen Demand (COD) in CETPs and Chloride interference on high COD level.
Project Summary : Chemical Oxygen Demand (COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution. Determination of COD is generally done through titrimetric analysis or through colorimetric analysis. For determination, a primary catalyst serves as a digestion catalyst whereas a secondary catalyst Silver Sulphate (AgSO4) assists the oxidization of straight-chain hydrocarbons. Chloride ions react with Silver Sulphate to form silver chloride which results in reduction in the oxidization activity. The cloudiness of silver chloride precipitate causes a false positive absorbance value and thus causes positive interference. Chloride ions are generally present due high chlorine content in water. High COD content in water can often pose as a threat to human health including toxic algae blooms, bacteria from organic wastes and seafood contamination. They also decrease the amount of dissolved oxygen available for aquatic animals. Removal or reduction of COD from CETPs is of utmost priority.
Objectives of the study
a)To implement effective primary physicochemical treatment to improve overall COD removal efficiency.
b)To come up with secondary and tertiary treatment technologies for effective removal of COD in water waters.
c)To devise alternative methods for COD determination especially for waters having high chloride content.
d)To come up with appropriate norms for discharge of waters with high COD content into environment.
Gujarat Environment Management Institute (GEMI)
(An Autonomous Institute of Government of Gujarat)
Office of the Director, 3rd Floor, Block no. 13, Dr. Jivraj Mehta Bhavan, Old Sachivalaya,