Net-Man - I like your summary statement: "For my part, I suspect SCA has found a cheaper method of sludge disposal that also provides some ecological benefit. Maybe the KDS plays a part in that and it remains to be found out."
I think both components of your statement are very important, and in some ways the second half "may be in the driver's seat". I refer to the ecological benefits. For a solid company who is consumer oriented cares about not only the cheapest cost, but also the ecological benefits. Intangible things such as employee
morale and pride, freeing up of governmental subsidies and support as well as other intangibles which are important but difficult to verbalize --all come into play.
As said earlier, I had a father-in-law who stood in that damp, mucky sludge. Everyone benefits from ecological benefits in many ways--especially when they also improve employee working conditions and company pride--and then reaching out with an end product that enhances the world around us. Waitedg