Treatment of the Papermaking Midcourse Wastewater Using Bio-Dopp

The bio-dopp process was used to treat papermaking midcourse wastewater. The COD
_cr
, BOD
₅
and color removal rate were investigated through the self-made experimental system. The COD
_cr
removal rate of reactor was higher than 90%, the BOD
₅
removal rate reached 96~99% as the BOD
₅
of effluent was less than 10 mg/L, the chroma of effluent reached 50 multiple. Moreover, the sludge concentration was about 8g/L under the optimum conditions of reactor, the system has a higher volume load and a lower sludge load. It shows that the COD
_cr
, and BOD
₅
of the papermaking midcourse wastewater can be removed significantly by bio-dopp technology and the chroma of effluent can also be decreased in evidence.