Fiber Recovery From Paper Mill Sludge at Ponderosa Pulp Products - Oshkosh, WI, 1993 Environmental Conference Proceedings

Paper mills are constantly trying to reduce outflow and solid wastes from their mill systems. Extensive and expensive waste handling systems

have evolved to handle waste streams and sludge. A new and simple system has been tested that can reduce landfill solids by as much as 60%, volume by 90%, and recover up to 85% of the good fiber presently lost. This system can easily be retrofitted into existing sludge systems. This system uses conventional and new technology equipment that may include some or all of the following: a pressure screen, advanced cleaners, a fractionation washer, a mechanical clarifier, and a sludge press.

The Ponderosa mill sludge was pre-evaluated for recoverable fiber. Large scale laboratory trials were performed which further showed the economic justification for a fiber recovery system. Results of these tests are presented. The system has been monitored since start-up in September 1992 and actual system results are presented.

The conclusions to be drawn are cost effectiveness of this type fiber recovery system, the quality of recoverable fiber, the reduction of mill waste product, and the positive effect on the environment.