Distinguish Between

Distinguish between BOD and COD.

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#### Solution

BOD |
COD |

1.1t means the oxygen demand of bio-degradablepollutants 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` |

Concept: Bod - Definition and Significance

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