Table of Contents
- 1 Why river water quality is measured in BOD and not COD values especially if the river is flowing near industrial clusters?
- 2 Why do BOD and COD values for the same water sample are always different Give two reasons?
- 3 What is the relation between BOD and COD BOD COD COD BOD BOD COD no relation?
- 4 Why COD measurement is necessary along with BOD test for waste water?
- 5 Why COD values are greater than BOD values?
- 6 Why do we measure BOD and COD?
- 7 How is BOD and COD measured?
- 8 Is BOD-COD ratio a good indicator for pollution measurement in River?
- 9 What is measuring BOD ( chemical oxygen demand)?
- 10 What is the relationship between BOD and pollution?
Why river water quality is measured in BOD and not COD values especially if the river is flowing near industrial clusters?
Because normally organic matter from residential and industrial effluents accounts for the largest share of pollution in rivers. Therefore, it is natural to use BOD as one of the main parameters for monitoring water quality. In this case, it is necessary to measure COD as well as BOD.
Why do BOD and COD values for the same water sample are always different Give two reasons?
COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised. This includes chemicals toxic to biological life, which can make COD tests very useful when testing industrial sewage as they will not be captured by BOD testing.
Why does COD affect water quality?
IMPORTANCE OF COD FOR WASTEWATER Higher COD levels mean a greater amount of oxidizable organic material in the sample, which will reduce dissolved oxygen (DO) levels. A reduction in DO can lead to anaerobic conditions, which is deleterious to higher aquatic life forms.
What is the relation between BOD and COD BOD COD COD BOD BOD COD no relation?
COD is closely related to BOD or Biochemical Oxygen Demand, the difference being that BOD is a test of the level of organic matter that can be biologically oxidised while COD is a test of the amount of organic matter that can be chemically oxidised.
Why COD measurement is necessary along with BOD test for waste water?
Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) are two of the most important parameters to characterise (measure the degree of pollution) of wastewater. BOD, the biological demand for oxygen a source of water has, is the amount of oxygen used by microorganisms to break down organic substances.
Does BOD COD water analysis?
COD (chemical oxygen demand) COD is the most popular alternative test to BOD for establishing the concentration of organic matter in wastewater samples. The COD test only takes a few hours to complete, giving it a major advantage over the 5-day BOD test. COD can test wastewater that is too toxic for the BOD test.
Why COD values are greater than BOD values?
Why do we measure BOD and COD?
BOD measures the amount of oxygen required by the aerobic organisms to decompose organic matter and COD measures the oxygen required to decompose organic and inorganic constituents present in the wastewater by chemical reaction. Hence, the value of COD is greater than BOD.
What is BOD in water quality?
Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic (oxygen is present) conditions at a specified temperature. The decay of organic matter in water is measured as biochemical or chemical oxygen demand.
How is BOD and COD measured?
The COD test should be considered an independent measure of the organic matter in a wastewater sample rather than a substitute for the BOD test….Can I use my COD results to predict my BOD?
| Sample 1: | COD = 2,150 mg/L | BOD = 1,100 mg/L |
|---|---|---|
| Sample 3: | COD = 1,850 mg/L | BOD = 997 mg/L |
| COD ÷ BOD = 1,850 ÷ 997 = 1.86 |
Is BOD-COD ratio a good indicator for pollution measurement in River?
Results of the investigation revealed that BOD: COD ratio is a good indicator for pollution measurement in river. It can be used as an indicator to predict the relationship of BOD and COD in the river. It is also found to be reliable and useful indicator to relate organic matter content in the river water.
What is the relationship of BOD and cod of river water?
The relationship of BOD and COD of river water for three rivers in Malaysia are investigated over a period of one year. Results of the investigation revealed that BOD: COD ratio is a good indicator for pollution measurement in river. It can be used as an indicator to predict the relationship of BOD and COD in the river.
What is measuring BOD ( chemical oxygen demand)?
Measuring BOD gives the COD or Chemical Oxygen Demand of inorganic substances. It indicates the polluting potential of water. BOD is used in medical and pharmaceutical industries to measure the oxygen consumption of cell cultures.
What is the relationship between BOD and pollution?
The more the BOD of a water body or water sample, the more it is polluted. The increase in organic matter can be due to environmental factors but are mostly due to anthropogenic causes like pollution. BOD is used as an index for measuring water quality.