The tubificidae, one type of metazoa was chosen to control activated sludge bulking which was caused by filamentous bacteria.
The foam is caused by the excessive growth of some filamentous bacteria and actinomycetes in activated sludge mixed liquor.
愚蠢人會一直延遲到明天，智者只活在當下。智者知道只有當下此時此刻別無其它時空。
Filamentous bacteria exists in every activated sludge system, the problem of sludge bulking will happen only when filamentous bacteria grows over than zoogloea, the obove-mentioned problem will not occur when filamentous bacteria and zoogloea equally grow.
