Please read the Manual on ...
Published by Muna Hindiyeh, Associated Professor at German Jordanian University. Senior Water Quality Expert
Please read the Manual on the causes and control of activated sludge bulking, foaming and other solids separation problems. 3rd edition. 2003.
Authors: David Jenkins, Michael G. Richard and Glen T. Daigger.
You will get lot of details regarding filamentous or bulking problems.