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Chemical Oxygen Demand (COD) is defined as the quantity of oxygen equivalents consumed during the chemical oxidation of natural make any difference by strong oxidant (e.g., potassium dichromate). The COD benefit suggests the quantity of oxygen which is needed with the oxidation of all natural substances in water in mg/l or g/m3.
COD contrasts with biochemical oxygen demand (BOD), which depends on the usage of microorganisms to stop working the organic material within the sample by aerobic respiration more than an incubation period (ordinarily 5 days).
COD Investigation will involve using a solid oxidizing agent to oxidize the organic compounds during the sample, and also the eaten oxidizing agent is then calculated to find out the COD value.
Take away the reagent blank by using, insert the test vial, address with the light defend, and again push the measure crucial. The instrument will go through the vial and Exhibit the test outcome which can be logged manually.
COD is Utilized in wastewater procedure to measure the quantity of organic pollutants in wastewater. It is a vital parameter in the design and Procedure of treatment crops, as it provides an estimate of the level of oxygen that should be needed to oxidize the organic and natural make a difference during the wastewater.
Most pre-prepared COD vial sellers will have a return plan for applied COD vials to ensure that utilised vials can be returned to The seller sealed in the initial containers for appropriate disposal.
The leading distinction between BOD and COD check here is always that BOD is the amount of oxygen that is certainly eaten by microbes even though decomposing natural matter underneath aerobic ailments While COD is the level of oxygen required for your chemical oxidation of complete natural & inorganic matter in H2O.
Shake the flask vigorously to dissolve the contents, then add 1000 ml of water and combine comprehensively.
The measurement of COD is frequently performed by including a robust oxidising agent, such as potassium dichromate, to the sample below acidic circumstances and heated for 2 hrs. The quantity of dichromate remaining offers an indication of simply how much organic and natural matter was existing.
Discharge limits vary from plant to plant based on get more info the traits in the obtaining water, results on aquatic lifetime, recreational works by using along with other factors.
Quite possibly the most existing modifications counsel the use of much more sophisticated products that may well be unfeasible if a single considers the benefit of acquiring and utilizing a spectrophotometer required to perform the approach.
In COD, it was observed that modifications are associated with the modify of reagents seeking more rapidly oxidation
This elevated h2o use and method wastewater technology calls for more successful removing of by-items and pollutants which allows for effluent discharge inside of recognized environmental regulatory limits.