Furthermore, in order to estimate the industrial sources
of PCBs, two wastewater samples were collected from the
largest dyeing chemical group in this zone, which mainly produced
disperse, reactive, acid, vat dyestuff, or pigments and
intermediates. One sample was the mother liquor produced
during the pigment synthesis process and the other was the
treated effluent of the mother liquor entering the WWTP.
The amounts of wastewater discharged into the WWTP were
about 8,000 m3 per day