Hello Mateo, one of the factors favoring the foaming of biological muds is the production of sulphides in the primary decanter. Indeed the filamentous typical bacteria Thiotrix feeds on sulphides! To remedy the moussage we can envisage three points of action: 1 to limit the concentration of primary muds in 10g / l of MS by frequent extractions, 2 to inject of the FeCl3 into the entrance(entry) of the zone anoxia to trap sulphides, 3 if need be handle punctually muds of the pond of aeration with a solution of whitewash in 5g / l to block(surround) the moussage of surfactants. Sorry for my bad english !!

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Hello Mateo,

one of the factors favoring the foaming of biological muds is the production of sulphides in the primary decanter. Indeed the filamentous typical bacteria Thiotrix feeds on sulphides!
To remedy the moussage we can envisage three points of action:
1 to limit the concentration of primary muds in 10g / l of MS by frequent extractions,

2 to inject of the FeCl3 into the entrance(entry) of the zone anoxia to trap sulphides,

3 if need be handle punctually muds of the pond of aeration with a solution of whitewash in 5g / l to block(surround) the moussage of surfactants.

Sorry for my bad english !!