3.1.7. Substitution of polymers (late 1990s)
The company’s objective of being totally independent of
external handling of sludge from the flotation plant has not yet
been fulfilled. This is due to the chemicals in the sludge. The
company tried to solve the problem in 1999 by using an ozone
system for the pre-treatment of thewastewater, but so far it has not
proved to be effective