In my experience biological ...

In my experience biological foaming in most cases is due to nocardioforms. Filamentous bulking and foaming can be controlled by various specific and nonspecific strategies. Specific control strategies are preferable as they are selective and offer a permanent solution of the problem whereas non-specific methods tend to provide only temporary solutions. Non-specific methods like, use of oxidizing chemicals are currently the only available strategies for effective foaming control and it can be applied in all WWTP. However, use of high chlorine doses may inhibit both nitrification and organic matter removal and cause floc break-up Therefore, based on evidence provided by microbiological observations .it can be concluded that chlorine remediation of foaming provide only temporary and superficial way for the treatment of wastewater containing oil and grease. the floc even after the chlorine application and maintains its potential for excessive growth .Higher aeration basin temperature provides favorable conditions for the growth of Nocardia while M. parvicella grows at lower temperatures. Due to the physical interlocking of the filaments in the foam provides stability to the foam and this type of foam is difficult to remove by antifoam chemicals. Nocardia and M.parvicella bacteria are tolerant to chlorine and are found within the flocs so, high chlorine dosages required for this type of foam control.