The 2-Minute Rule for chemical oxygen demand test
The 2-Minute Rule for chemical oxygen demand test
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The “cod” image will flash for three seconds, then the sample test result will show up while in the Display screen as part for every million COD. Document the test outcome.
It is actually utilised to supply an indication of the level of pollution in the drinking water system, Particularly following a water treatment method method.
COD is actually a important indicator of water top quality which is used in a variety of purposes, such as the following:
Superior COD concentrations in wastewater suggest the presence of natural and organic substances that may reduce the level of dissolved oxygen.
By reducing organic and natural resources from wastewater with coagulants and flocculants, the Opposition for dissolved oxygen amongst maritime existence and micro organism is lessened, as microorganisms no more have “food” to thrive.
One vial is marked to be a “blank,” and 3 or 4 vials are marked with known standard stages. Two vials are then marked for the wastewater sample to help make a duplicate run. Note: If a number of wastewater samples are being run, no less than 10% of samples are duplicated.
Note the excellence amongst this and the opposite oxygen demand test (BOD). COD is when all components are totally chemically oxidized; BOD is barely that product that is get more info oxidized by (occasionally uncooperative) micro organism in excess of a duration of five days. Any method that may be able to oxidizing compounds and enables the quantity of oxidation to become measured could theoretically be used to ascertain COD. The dichromate ion (Cr2O72-) has demonstrated by itself to become most effective fitted to general intent COD and is required in all approved solutions.
The h2o sample is boiled with potassium dichromate inside a strongly acidic medium less than reflux. The organic compounds existing during the sample are oxidized through the dichromate.
O&G includes a group of related constituents which might be of here Distinctive issue in wastewater treatment due to their exclusive physical Houses and really concentrated Strength articles.
Discharge limitations vary from plant to plant with regards to the traits on the obtaining h2o, outcomes on aquatic everyday living, recreational utilizes as well as other components.
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The COD is the quantity of oxygen expected by each the inorganic and organic and natural factors of the wastewater sample.