Wood fiber accounts for more than 90% of the raw material used in the production of paper and board products, and it can come from a variety of sources. These sources can be slushed virgin fiber that is produced onsite, market pulp from other pulp mills, or recycled/secondary fiber. In the "recycled" fiber category, the most difficult source to process is post-consumer waste. This fiber arrives at the mill contaminated with a variety of undesirable materials, also called rejects. In this course, we will identify the sources of rejects in a recycled fiber facility, identify the types of rejects or contaminants generated, and discuss how they are subsequently processed, or "handled."
•Identify and describe the source of rejects in recycled fiber
•List the two goals in the treatment of every recycled fiber reject stream
•List the two major types of reject streams
•Identify and describe two uses for flotation separation
•Describe the importance of dewatering rejects
•Identify and describe commonly used equipment for dewatering rejects
•Identify and describe some of the alternatives for final reject disposal
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