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MLSS is used to measure the TSS in activated sludge, while MLVSS is used to measure the concentration of biomass in activated sludge.

Return activated sludge, or RAS, is used to maintain the population of microorganisms needed for reaction to proceed in the aeration tank. In a way, this is a method of optimization in wastewater treatment.

Several factors could cause foaming in the SBR and the CCC, sometimes even in the equalization tank.
1. First, check that you are not overaerating; the maximum DO in each tank should be at 4mg/L. If it's more than that,... (More)