BOD is preferred to COD as an index of sewage concentration because

- 1
  
  BOD represents both carbonaceous and nitrogenous organic matter while COD may indicate carbonaceous matter only
- 2
  
  BOD test is easier to perform and gives more reliable results
- 3
  
  BOD relates specifically to putrescible organic matter which is the most objectionale sewage constituent
- 4
  
  COD relates to the inpurities which can only be removed by chemical treatment which is expensive

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