Which one of the following is least important in the activated sludge process?

- 1
  
  proper porportion of the return sludge from the secondary settling tank
- 2
  
  adequate aeration in the biological reactor, so as to maintain certain minimum dissolved oxygen
- 3
  
  proper food to micro - organisms (F:M) ratio
- 4
  
  the sludge volume index of the return sludge to be less than 200

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