Technical Bulletin No. 0104: New and Basic Research Approaches to Pulp and Paper Mill Liquid Effluent Treatment

Despite many years of study, a completely satisfactory method for dewatering and disposing of unusable sludges produced from the clarification of white waters is, in many cases, not available. Some of these sludges are presently returned to the system for incorporation in the product, but this procedure is becoming increasingly undesirable, as quality requirements and paper machine speeds rise. Land disposal, widely practiced for want of better methods, leaves much to be desired, and, in many instances, presents no permanent solution. Its use would be greatly enhanced if means of reducing the volume of more types of sludge through dewatering were available.