Dear Matteo, May be you ...
Published by Claudio Comoglio
Dear Matteo,
May be you are living close to Venice and for this reason bleach could not be used. If you have filamentous bacteria one of the system that I used many time ago into a food plant was to dose on the sludge ricirculation glutaraldeide at 25% at 5 ppm. In this manner it was possible to reduce the filamentous concentration and the foam was reduced.
Maybe you can try dosing less only 2-3 ppm and check by microscope. An overdose of PAC can also increase de sedimentation of the filamentous but it is not always an advantage for foam but if you need to reduce P content there are not alternative.
Good luck
1 Comment
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 !!
Published by Christian Coursier