Review of Process Modifications for Implementation of Zero Discharge at Recycled Fibre Board Mills, 1996 Minimum Effluent Mills Symposium Proceedings
Paul Stuart & Pascale Lagacé
BEAK Consultants
Due to increasingly stringent effluent regulations and industry awareness of environmental issues, recycled fibre furnish paperboard mills are considering zero-discharge operation as an economic option to achieve compliance. This paper reviews typical process modifications that are required to implement zero discharge operation at paperboard mills. The process equipment items used to achieve zero discharge operation are not sophisticated, and generally include primary treatment, adequate water storage, stainless steel metallurgy, and often a segregated cooling water system. Chemical programs must achieve consistently high first-pass retention of fines, clays, size and colloidal contaminants such as pitch. Recycled water must replace fresh water for most applications including gland water and papermachine shower water.
Review of Process Modifications for Implementation of Zero Discharge at Recycled Fibre Board Mills,