TOC measures the whole carbon articles, such as each natural and organic and inorganic carbon, while COD exclusively focuses on the oxidizable natural and organic articles.
Chemical oxygen demand is definitely an index of air pollution that steps the effect of pollutants on dissolved oxygen. In the COD test, an oxidant aside from O2 is accustomed to degrade the pollutants from the water sample.
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Safe the cap onto Each and every COD vial. Ensure to not overtighten the cap since it could destruction the closure.
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.
Knowledge of oxygen demand is useful through the entire treatment for measuring waste loading, evaluating the performance of the method and making sure compliance with regulations to the oxygen demand of effluent.
A different challenge is The shortcoming of the traditional COD strategies to differentiate in between biologically available and inert organic issue. This can result in overestimation of the quantity of oxygen necessary for Organic cure processes.
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Thanks to these downsides, various choice approaches to carry out BOD analyses are developed.
Divide the COD concentration through the BOD concentration for each sample and ordinary the outcomes. As an example, beneath is the COD:BOD ratio formulated utilizing 3 wastewater samples from a food items processor:
COD h2o Investigation is essential in wastewater for identifying get more info the amount of squander (contamination) within the h2o. Waste that’s superior in organic make any difference needs therapy to lower the amount of natural and organic waste before discharging into getting waters. Why does this issue? If wastewater treatment method facilities do not lower natural articles of the wastewater just before it reaches natural waters, microbes within the receiving water will take in the natural issue.
Knowing the concept of COD is essential for These involved with environmental science, civil engineering, and wastewater treatment method.