What is the WWTP processing?  ...

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What is the WWTP processing?  Is it a domestic sewage plant or is it an industrial or food or dairy plant?  You may assume that the oxygen levels are good because you can measure oxygen levels at the surface, but oxygen may not have transferred well into the water.  If there are areas of poor mixing,  poor oxygen transfer, then Microthrix may develop.   What are the MLSS levels?  It is very difficult to provide general advice without looking at the plant itself, its loadings and microscopic examination to determine what else is present.

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First,thanks at all for your answers.

It is a big WWTP who treat domestic and industrial wastewater.Probably is a combination of factors that determine the incidence of M. Parvicella.

I say this because this year the biggest problems we had in april-may and not in the months with the lowest temperatures.

D. Anghel

 

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