Sludge from primary treatment has to be disposed off… what 3 methods of disposal are common. Which one would you use and why? 

More and more companies are considering the use of bio filters for water treatment. What are biofilters, how do they work? 

If effluent is discharged that contains large amounts of solids, these solids will settle at the bottom of rivers and lakes as a sludge blanket. This often results in the development of a strong odor. Explain why that happens.

Your mill is discharging a dark brown effluent stream. The color comes from the wet debarker and is not completely removed in the effluent treatment plant. You are put in charge of taking care of this color. What would you do?

What is cast coating? Explain this type of coating. What kind of paper is coated with this process? 

What effect is called “rimming” (in the dryer section)? Why can this be an issue, and what is done to keep its impact to a minimum?

Pigment content (in %) of coating colors is around 

which of the properties below are determining coated sheet properties 

What function does the felt have in the press section? List two functions.

Complete the following sentence.  Hard nip calendering results in paper with ______ thickness but variation in ______.