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COD contrasts with biochemical oxygen demand (BOD), which depends on the use of microorganisms to break down the natural material during the sample by aerobic respiration about an incubation time period (ordinarily 5 days).
YES. Whilst COD should be considered an unbiased test from BOD, and may create a higher focus examining than BOD for a particular wastewater sample, it is generally recognized that COD and BOD share an empirical partnership.
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COD is Employed in wastewater therapy to measure the level of organic pollutants in wastewater. It's really a significant parameter in the look and Procedure of remedy vegetation, as it offers an estimate of the quantity of oxygen that can be needed to oxidize the natural and organic make a difference from the wastewater.
If BOD was often made use of, a challenge Along with the therapy process wouldn’t be detected until five days afterwards. This would indicate that wastewater would wish being held for days until eventually benefits may very well be verified.
Chemical oxygen demand (COD) is undoubtedly an oblique measurement of the quantity of natural and organic issue get more info in the sample. When doing a COD test, you'll be able to measure practically all organic compounds that may be digested by a digestion reagent.
Later on, you can calculate just how much dichromate went to oxidizing natural and organic content based upon just how much we originally included and simply how much was remaining more than.
Wastewater Procedure Effectiveness: COD measurements are essential for analyzing the general performance and website performance of wastewater therapy processes. By measuring the COD of influent (Uncooked) and effluent (taken care of) wastewater, cure plant operators can evaluate the success of the treatment method approach in taking away organic and natural pollutants.
The test entails using dangerous chemicals that has to be disposed of properly and could represent a danger towards the operators.
Because of the above, it's important to test the different alternate tactics, at the very least for COD and BOD, in several areas for example cost–benefit, validation, efficacy and sensitivity Using the intention of proposing a single as an alternative to the reference tactics.
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Together with the potassium dichromate in fifty% sulfuric acid Alternative, pre-well prepared COD vials also comprise silver sulfate as being a catalyst and mercuric sulfate to eradicate chloride interference. Hence, COD vials are thought of hazardous waste and should be handled and disposed of in an permitted way.