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Chemical Oxygen Demand (COD) is described as the amount of oxygen equivalents eaten inside the chemical oxidation of organic matter by robust oxidant (e.g., potassium dichromate). The COD worth signifies the amount of oxygen which is necessary to the oxidation of all organic and natural substances in drinking water in mg/l or g/m3.
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The level of potassium dichromate Utilized in the reaction is akin to the amount of oxygen (O2) necessary to oxidise the wastewater’s organic content.
High COD concentrations in wastewater show the presence of natural substances that could reduce the quantity of dissolved oxygen.
Chemical oxygen demand is an index of pollution that measures the result of pollutants on dissolved oxygen.
If BOD was usually employed, an issue Along with the procedure course of action wouldn’t be detected right until five times later. This might necessarily mean that wastewater would want to be held for times until success could possibly be confirmed.
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Extensive observation on the COD and BOD ranges on a similar wastewater has proven the COD to BOD ratio of a specific wastewater will keep on being consistent as time passes.
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This may be measured click here by slowly introducing a coloured indicator that reacts Using the dichromate. The resulting colour will modify when there is no additional dichromate to react. This stop position is monitored possibly visually or by means of photometry, and the volume of indicator utilised can be employed to compute the initial COD information.
For anaerobic COD elimination, microorganisms are accustomed to change organic squander parts into biomass while in the absence get more info of oxygen.
Modifying the varied analytical approaches reviewed In this particular summary focuses on lessening periods, reagents, and waste generation in addition to trying to find higher sensitivity.
Comprehending the thought of COD is essential for Individuals associated with environmental science, civil engineering, and wastewater cure.