One of the culprits that can ...
Published by John Salonich, Vice President / Managing Director
One of the culprits that can cause such a condition is over digested sludge in the form of "pin-floc" that requires additional polymers to enhance settling. This can be caused by too much aspirated oxygen in the aeration process used in decanting the recycle. Review any possible changes in the air system such as temperature--increased solubility means more O2 aspirated in the transfer and available for enhanced digestion.