There are plenty of solutions for measuring COD, Just about every with its benefits and drawbacks. The most typical techniques consist of the dichromate strategy, the permanganate process, and the shut reflux technique.
The prospective distinction between the reference electrode plus the pH electrode is utilised to find out the pH worth of the drinking water sample.
A COD test can be utilized to assess the incoming influent good quality so operators can react to shifting waste load disorders. This assures the most effective treatment method processes are being used to reduced charges and to make sure that the effluent is in the permit limits prior to discharge.
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Chemical oxygen demand (COD) is utilised to find out the quantity of air pollution in drinking water after wastewater treatment method. The upper worth of chemical oxygen demand implies the higher natural and organic pollution inside the water sample.
Nền tảng cho thử nghiệm COD là gần như mọi hợp chất hữu cơ đều có thể bị oxy hóa đầy đủ để tạo ra dioxide cacbon bằng các chất oxy hóa mạnh trong các điều kiện axít.
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The largest problem with a number of of your alternatives is their high Value and some time they require compared While using the standardized technique.
The COD test uses a chemical (potassium dichromate in the fifty% sulfuric acid solution) that “oxidizes” equally natural and organic (predominate) and inorganic substances inside a wastewater sample, website which ends up in an increased COD focus than BOD focus for a similar wastewater sample because only natural compounds are eaten during BOD testing.
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Discharge limitations vary from plant to plant dependant upon the qualities on the obtaining drinking water, outcomes on aquatic daily life, leisure takes advantage of and also other components.
However, only modifications while in the detection techniques are reviewed inside the Assessment of TOC. These methods are pricey, but they've got higher sensitivity, so it was avoidable to perform further modifications.
Mercury-cost-free reagents: Most COD vials consist of mercury sulfate to get rid of chloride interferences, which would normally produce a falsely high COD price. COD-free of charge website vials tend not to comprise mercury, which makes them much more liable to chloride interferences, but greatly lessen the protection and environmental pitfalls of handling mercury.
For Recommendations on logging COD Evaluation effects manually or immediately on the memory, begin to see the V2000 operator handbook.