Abstract: Because the lack of detailed study of biological decolorization in
high salt dye wastewater, it is still difficult to evaluate the biological
treatment on high-salinity dye wastewater. The experiments were carried out to
study the salt-tolerant bacteria, which is useful in the treatment of
high-salinity colored wastewater. Simulated wastewater containing 5–150
g/L salt (NaCl) and 50–2000 mg/L Reactive Brilliant Red K-2BP was treated
with three salt-tolerant mixed cultures (CAS, TAS, DSAS), which were under a
gradually acclimated procedure. With the increase of concentrations of salt and
dye, the decolorization became low. The abilities of decolorization of dyes
wastewater by three mixed cultures (CAS, TAS, DSAS) were studied, CAS and DSAS
mixed cultures showed more active for the treatment of high-salinity colored
wastewater than TAS mixed cultures. The results suggested that there might be a
simple process for the high salt wastewater treatment, which could be
incorporated into conventional activated sludge plants.
