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What is the difference between chemical oxygen demand (COD) and biological oxygen demand (BOD)?

Both COD and BOD testing strategies are designed to point the quantity of contamination in a water sample. COD is the quantity of oxygen required to chemically break down contaminants, whereas BOD is the amount of oxygen required for biodegradation by microorganisms.There is a powerful correlation between COD and BOD, however COD analysis is a faster and more accurate method.
BOD analysis is performed to determine the impact of dirty water containing micro organism and natural materials on plant and animal life when released right into a stream or lake. Bacteria need to soak up oxygen to break down natural material (pollution) in the water. The test measures the potential for the incoming water to deplete the oxygen in the receiving water because of bacterial exercise.
If there are เกจวัดแรงดัน of natural waste and micro organism within the water, it’ll have a adverse impact on the surrounding ecosystem. Low levels of organic waste and less micro organism current signifies that BOD shall be lower and dissolved oxygen levels will be larger. the BOD test consists of acquiring an initial dissolved oxygen (DO) studying and a second studying after 5 days of incubation at 20 °C.
COD evaluation, then again, measures the oxygen consumption capability of a water sample contaminated with natural waste. Specifically, it measures the equal amount of oxygen required to chemically oxidize organic compounds in the water and thereby get rid of the contamination. COD is an integral part of all water high quality management packages.
Almost all wastewater remedy vegetation must measure one of these two objects as an indicator of the pollution value within the water. For extra water quality indicators and associated monitoring tools for wastewater therapy, please see this article water quality sensors for water treatmet.
COD VS BOD

BODCOD

BOD is a organic oxidation processCOD is a chemical oxidation course of

BOD is performed by aerobic organismsCOD is carried out by chemical reagents

BOD is measured by maintaining a sealed water sample for incubation for a interval of 5 days at 20 degree Celsius. The discount in dissolved oxygen provides the amount of oxygen consumed by the aerobic organisms.In COD check, the water sample is incubated with a robust

oxidant together with boiling sulphuric acid for a specific time frame and temperature.
BOD value is set by 5 days.COD could be measured

within few days.
BOD value is lower than CODCOD worth is all the time higher than BOD

BOD is used to oxidize the natural

organic matter and organic waste within the waterCOD is capable of degrading the industrial sewage. COD doesn’t measure the amount of oxygen consumed by acetates present in the water sample

COD VS BOD

ClassificationBOD (mg/l )COD (mg/l )

Weak<200<400 Medium350700 Strong5001000 Very Strong>750>1500

BOD and COD characteristics of home wastewater

Read extra about water high quality parameters:
Ammonia in wastewater

Nitrate in water high quality

Ammonia vs ammonium

Solution of water pollutionn
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What is the difference between chemical oxygen demand (COD) and biological oxygen demand (BOD)?

Both COD and BOD testing strategies are designed to point the amount of contamination in a water sample. COD is the quantity of oxygen required to chemically break down contaminants, while BOD is the amount of oxygen required for biodegradation by microorganisms.There is a strong correlation between COD and BOD, however COD evaluation is a faster and extra accurate technique.
BOD analysis is carried out to find out the influence of soiled water containing bacteria and natural material on plant and animal life when released into a stream or lake. Bacteria need to soak up oxygen to interrupt down organic materials (pollution) in the water. The take a look at measures the potential for the incoming water to deplete the oxygen in the receiving water as a end result of bacterial activity.
If there are excessive levels of natural waste and micro organism within the water, it will have a negative impression on the encompassing ecosystem. Low ranges of organic waste and fewer bacteria present means that BOD shall be decrease and dissolved oxygen ranges shall be larger. the BOD check consists of obtaining an initial dissolved oxygen (DO) reading and a second studying after 5 days of incubation at 20 °C.
COD analysis, however, measures the oxygen consumption capability of a water pattern contaminated with organic waste. Specifically, it measures the equal quantity of oxygen required to chemically oxidize organic compounds in the water and thereby get rid of the contamination. COD is an integral a part of all water high quality management programs.
Almost all wastewater therapy plants must measure considered one of these two gadgets as an indicator of the pollution value in the water. For more water high quality indicators and associated monitoring gear for wastewater therapy, please see this text water high quality sensors for water treatmet.
COD VS BOD

BODCOD

BOD is a biological oxidation processCOD is a chemical oxidation course of

BOD is performed by cardio organismsCOD is carried out by chemical reagents

BOD is measured by maintaining a sealed water pattern for incubation for a period of 5 days at 20 degree Celsius. The reduction in dissolved oxygen gives the amount of oxygen consumed by the cardio organisms.In COD take a look at, the water pattern is incubated with a strong

oxidant together with boiling sulphuric acid for a specific time period and temperature.
BOD value is determined by 5 days.COD could be measured

inside few days.
BOD value is decrease than CODCOD value is all the time higher than BOD

BOD is used to oxidize the pure

organic matter and organic waste in the waterCOD is capable of degrading the economic sewage. COD does not measure the quantity of oxygen consumed by acetates present in the water pattern

COD VS BOD

ClassificationBOD (mg/l )COD (mg/l )

Weak<200<400 Medium350700 Strong5001000 Very Strong>750>1500

BOD and COD traits of home wastewater

Read more about water quality parameters:
Ammonia in wastewater

Nitrate in water high quality

Ammonia vs ammonium

Solution of water air pollutionn