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What is Chemical Oxygen Demand (COD)

Handbook of Research on Waste Diversion and Minimization Technologies for the Industrial Sector
The measure of the amount of oxygen required to oxidize all organic material into carbon dioxide and water. COD values usually are higher than BOD values, but COD measurements can be obtained in a few hours while BOD measurements take five days.
Published in Chapter:
Performance of Chitosan and Polyglutamic Acid in Palm Oil Mill Effluent Treatment
Man Djun Lee (University College of Technology, Sarawak, Malaysia) and Pui San Lee (University College of Technology, Sarawak, Malaysia)
DOI: 10.4018/978-1-7998-4921-6.ch007
This chapter presents the study on pollutant removal efficiency in palm oil mill effluent using chitosan and polyglutamic acid (PGA). Up until today, palm oil mill effluent (POME) has been considered one of the significant sources of environmental pollution. The characteristics of POME include contaminating the source of drinking water, which is also harmful to the aquatic ecosystem by creating a highly acidic environment or causing eutrophication. With increasing public awareness of environmental pollution, it creates the need to address this issue. Both chitosan and PGA are non-polluting food-based anionic and biodegradable biopolymers that are environmentally friendly in wastewater treatment. The critical parameter to determine the effectiveness of pollutants removal is chemical oxygen demand, colour, and total suspended solids. In this aspect, this chapter also discussed some of the significant findings done in previous studies to provide proper understandings and implications on this topic.
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Microbial Bioreactor Systems for Dehalogenation of Organic Pollutants
It is measure of the amount of oxygen that can oxidize the soluble and particulate organic matter in water.
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Effect of Dyes on Water Chemistry, Soil Quality, and Biological Properties of Water
Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals.
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Commonly Used Methods to Calculate Water Quality Indices
Measures chemical waste and is related with BOD in water. Organic carbon is changed to carbon dioxide through the oxidation either by burning or by chemical oxidation in water. The carbon dioxide gas is swept out or dissolves in water provoking the pH changes ( WHO, 1996 ).
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Redox Reactions for Chemical Oxygen Demand in the Light of Health, Environmental Protection, and Technical Practicability
A sum parameter for the sum of all substances present in water that can be oxidized under certain conditions usually with potassium dichromate as the oxidant. It indicates the amount of oxygen (in mg/L) that would be required for their oxidation if oxygen were the oxidizing agent.
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Dyeing Processing Technology: Waste Effluent Generated From Dyeing and Textile Industries and Its Impact on Sustainable Environment
The amount of dissolve oxygen necessary for complete biodegradation of chemically oxidizable substances present inside the water bodies is known as chemical oxygen demand.
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