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What is the thickened concentration of the thickened sludge from the rotating biological contractor?

What is the thickened concentration of the thickened sludge from the rotating biological contractor? Correct Answer 3-5%

The unthickened sludge from rotating biological contractor is around 1-3.5%. In most cases, it is considered 2%. The thickened sludge is around 3-5%. In most cases, it is considered 5%.

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