Table of Contents
- 1 Why does the COD analysis and BOD analysis give different results for the same water sample?
- 2 How COD is different than BOD Why should it be determined?
- 3 What are COD and BOD and how are these similar and different?
- 4 What is the importance of COD and BOD?
- 5 What do you understand by BOD and COD?
- 6 Why are BOD and cod important in wastewater treatment?
- 7 What is the BOD test for water quality?
Why does the COD analysis and BOD analysis give different results for the same water sample?
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.
What is the relationship between the COD and BOD values in waste water?
The only relation between COD & BOD is – COD > BOD. For most industrial process waste water, community sewage, drains and even some hetrogeneous sources, COD/BOD ratio has been found to be in a defined range and hence, COD result gives more or less BOD value range for such identifiable waste water.
How COD is different than BOD Why should it be determined?
COD is the amount of oxygen required to chemically breakdown the pollutants whereas BOD is the amount of oxygen required to do this biologically through micro-organisms. There is a strong correlation between COD and BOD, however COD analysis is a much faster and more accurate method.
What is BOD write down the differences between BOD and COD?
The main difference between BOD and COD is that BOD is the amount of oxygen which is consumed by bacteria while decomposing organic matter under aerobic conditions whereas COD is the amount of oxygen required for the chemical oxidation of total organic matter in water.
What are COD and BOD and how are these similar and different?
Chemical Oxygen Demand (COD) v/s Biological Oxygen Demand (BOD)
| BOD | COD |
|---|---|
| BOD is used to oxidize the natural organic matter and organic waste in the water | COD is capable of degrading the industrial sewage. COD does not measure the amount of oxygen consumed by acetates present in the water sample |
Why is BOD and COD important?
COD and BOD tests are important because they help in the determination of the amount of waste in wastewater. This is important because the organic content in wastewater needs to be reduced before the wastewater is discharged.
What is the importance of COD and BOD?
What is the relationship between BOD and DO?
The amount of dissolved oxygen used up by aerobic microorganisms to decompose the organic matters present in a sample of water is termed Biochemical Oxygen Demand or Biological Oxygen Demand (BOD). BOD and DO are inversely proportional to each other i.e a decline in DO levels reflects a high level of BOD.
What do you understand by BOD and COD?
The biochemical oxygen demand (BOD) represents the amount of dissolved oxygen (DO) consumed by biological organisms when they decompose organic matter in water. The chemical oxygen demand (COD) is the amount of oxygen consumed when the water sample is chemically oxidised.
How does BOD compare to cod?
COD (Chemical oxygen demand): It is the amount of oxygen required for the decomposition of both biodegradable & non-biodegradable organic matter present in the system….Detailed Solution
- ThOD mostly greater than COD.
- BODu = 0.9ThOD, ThOD > BOD. u
- BOD5 = 0.77 BODu , BODu > BOD.
- COD/TOC = 32/12 = 2.66.
Why are BOD and cod important in wastewater treatment?
As gauges of organic matter in a sample, BOD and COD are critical in wastewater for determining the amount of waste in the water. Waste that’s high in organic matter requires treatment to reduce the amount of organic waste before discharging into receiving waters.
What is the difference between BOD and cod in biology?
Difference Between BOD and COD. Definition. BOD: BOD is the amount of oxygen consumed by bacteria while decomposing organic matter under aerobic conditions. COD: COD is the amount of oxygen required for the oxidation of total organic matter in water.
What is the BOD test for water quality?
This is not a precise quantitative test, although it is widely used as an indication of the organic quality of water. The BOD value is most commonly expressed in milligrams of oxygen consumed per liter of sample during 5 days of incubation at 20 °C and is often used as a robust surrogate of the degree of organic pollution of water.
What is chemical oxygen demand (COD) test?
As Wikipedia put it: The chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water. Most applications of COD determine the amount of organic pollutants found in surface water (e.g. lakes and rivers) or wastewater, making COD a useful measure of water quality.