Hi, I will agree with Mr ...

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Hi, I will agree with Mr Little. It is really a case by case study. In my opinion MBBR are really easy to operate, suitable for remote places and small WWTP. Particularly when high infiltration due to storm warter are present - the biomass never leave the tank. When high effluent quality is needed an MBR may be more cost effective and easy to operate than any other technology. SBR and Conventional plants have also their advantages. 

When retrofitting an existing plant MBBR and MBR could be a cheap solution.