The Basic Principles Of chemical oxygen demand test
The Basic Principles Of chemical oxygen demand test
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Chemical Oxygen Demand (COD) is defined as the amount of oxygen equivalents consumed inside the chemical oxidation of organic and natural issue by solid oxidant (e.g., potassium dichromate). The COD value signifies the level of oxygen which is necessary to the oxidation of all organic and natural substances in drinking water in mg/l or g/m3.
The COD test need to be regarded as an unbiased measure of your organic subject in the wastewater sample instead of a substitute for that BOD test.
WARNING! Since O&G adheres to plastic, only glass sample collection containers can be utilized to gather O&G samples!
The overall purpose in the EOS is to decrease the price of performing enterprise, boost environmental sustainability and competitiveness from the condition's industries, lessen costs for government companies and services, and improve financial development.
Nhiều chính quyền đưa ra các quy định chặt chẽ liên quan tới nhu cầu oxy hóa học tối đa được phép trong nước thải trước khi nó được đưa trở lại môi trường.
Digestion is carried out by refluxing (one hundred fifty °C). The get more info excess of dichromate might be determined by titration or spectrophotometry, and applying mercury salts to eradicate the interference brought on by chlorine is necessary. Dichromate is considered as the most effective oxidizing agent and also the organized Resolution is stable for a long time, the foremost difficulty that reveals may be the technology of hugely harmful squander [12, fifty nine].
Khối lượng oxy cần thiết để oxy hóa một hợp chất hữu cơ thành dioxide cacbon, amonia và nước được thể Helloện dưới dạng tổng quát là:
Right after dilution, the ensuing difference between the First and remaining DO reading only must be multiplied with the dilution issue to determine the ultimate BOD outcome.
Higher COD amounts can point out a higher volume of organic and natural pollutants within the wastewater, which may be harmful towards the natural environment and human health and fitness. As a result, reducing the COD in wastewater ahead of it is discharged is A significant goal of wastewater treatment method processes.
Process Summary – An aliquot with the sample is digested for two hrs at 150°C from the existence of dichromate and sulfuric acid. The resulting Alternative is titrated to a colored endpoint with ferroin indicator or read on a spectrophotometer read more at an ideal wavelength.
There is a correlation involving COD and BOD, however, it should be experimentally proven ahead of working with one parameter to express Yet another. Normally COD Investigation (which is a much faster and much more accurate system) is utilized to estimate BOD utilizing the recognized correlation.
Full Carbon Oxidation: The large temperatures used in the combustion procedure make sure the entire oxidation of carbon compounds, offering exact and dependable measurements.
BOD value approximates the quantity of oxidizable organic subject. Consequently, it is applied for a evaluate of the degree of water air pollution and squander energy.