7. Effluent treatment

7.1 Effluent characteristics

Paper mill effluents are mainly composed of :

• process water overflow and drips around the paper machine;

• water from glands, pumps, mixers, refiners and purifiers;

• machine head purification rejects ;

• pressing water wastewater from pasta preparation ;

• washing water from kitchens and sleeping quarters;

• sludge dewatering water.

These flows are collected by a network of gutters and sent to the plant via a lift pump. The resulting effluent mainly contains suspended matter such as fibers, cellulose fines, mineral...