Pulp bleaching is usually accomplished in sequential stages using a combination of chemicals. It is
common for the pulp to be washed between stages to remove spent chemicals, dissolved lignin, and
other soluble products. After use, this wash water is discharged and represents the bulk of the effluent
discharge from the bleach plant and is often a significant part of total mill discharge. Partial or complete
counter-current circulation of wash water (i.e., circulation from latter stages to earlier stages) is a common
water conservation practice.
Click on the links at the right for more information.
More information:
Impact of reuse and recycle of bleach plant filtrates
Conventional reduction of bleach plant chemical and water requirements
Barriers to recovery of bleach plant filtrates
- WATER
- ENERGY
- GREENHOUSE GASES
- WOOD USE
- EMISSIONS TO AIR
- DISCHARGE TO WATER
- SOLID WASTE
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