COMPONENTS OF A SUCCESSFUL IN-MILL CLOSE UP PROGRAM.

A fine paper mill (groundwood pulp and enamel printing papers) in central Wisconsin achieved a 40% reduction in wastewater flow discharges through a comprehensive two year in-mill close up program. Mill discharges are now 6,100 gallons of waste water/ton pulp and paper production. This flow reduction is in a large part responsible for the outstanding success of the mill's new Secondary Treatment Plant, discharges from which are only 10-20% (suspended solids, 8. 5 ppm; BOD//5, 10 ppm) of the specified July 1, 1977 BPT limits. Specific projects (reuse of white water, recycled vacuum pump seal water, hot water collection) of the overall flow reduction program are referred to and to some extent described in detail, particularly their contribution to flow reduction, and impact on energy conservation. Significant factors and requirements for this successful mill close up project are addressed, including the utilization and importance of SNAP, a computer based CPM for monitoring both mill effluent flow reduction program, and the external Secondary Treatment Plant project.