One of the main limitations of the COD test is its inability to differentiate between biodegradable and biologically inert organic matter on its own.it is the amount of oxidant consumed during oxidation of organic substances present in water samples. As per the standard methods of detecting COD, potassium dichromate (K2Cr2O7) or potassium permanganate (KMnO4) are generally used as oxidizing agents. It was found that for dosages of activated carbon in the range of 50–150 mg/l, the removal efficiencies for BOD increased from 27–70% to 76–94% while those for COD increased from 16–64% to 72–92.5% for inlet values of 45–95 mg/l and 110–200 mg/l for BOD and COD respectively. The activated carbon filter will need to be replaced as its ability to dechlorinate the water will slowly decline. Spent carbon can be re-activated; however, re-activated filters should only be used in waste-water treatment applications. In recent years, the COD has increasingly been replaced by the total organic carbon (TOC) parameter. Since the limit values of the pollution levels are usually given in terms of the COD, efforts are being made to find the correlation between these parameters.
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