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Question
Distinguish between BOD and COD.
Distinguish Between
Solution
| BOD | COD |
| 1.1t means the oxygen demand of bio-degradable pollutants only. |
it measures the oxygen demand for bio-degradable pollutants along with non-biodegradable pollutants. |
| 2.Less stable measurement method as it uses micro-organism which are susceptible to pH, temperature and other variable in the water. | More stable measurement method as it uses potassium dichromate which oxidises regardless of water condition. |
| 3. Siow process. It takes 5 days. | Fast process. It takes 2-3 hours. |
| 4.BOD values are generally less than COD values. | COD values are generally greater than BOD values. |
| 5.`BOD =(DO_b DO_i)xx(" Volume of undiluted sample")/(" Volume of diluted sample.")` | `COD = ((V_1-V_2 ) xx N xx 8000) /Y` |
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Bod - Definition and Significance
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