sulfate, sodium dodecyl benzene sulphonate and sodium alkyltrioxyethylene
sulphate) in activated sludge systems at 250 mg
MBAS/L and obtained increase or decrease in the VSS concentration
in the reactor, depending on the dilution rate applied. In
higher HRT, chemical surfactants were consumed and served as a
substrate for microorganisms, increasing the VSS concentration in
the reactor up to 3. In lower HRT, however, the VSS concentration
reduced by up to 6 in test bioreactors, which contributed to the
loss of system efficiency. The authors also observed lower SVI
values in the test bioreactor during periods when reductions in the
biomass concentration were observed. These results, consistent