NAMS 2002 Workshop - ICOM 2008

ETNA01PP, ETNA10PP, and UFX5pHt were selected for further experiments in
2.5 spiral wound modules using process water from Kvarnsveden pulp mill. In
these experiments, among others the flux decline with increasing concentration
of hemicelluloses at different transmembrane pressures and cross-flow velocities
as well as the retention of hemicelluloses under these conditions were studied.
The experimental results of ETNA10PP, ETNA01PP and UFX5pHt were then
used as basis for the development of a full-scale system to treat a feed stream of
100 m 3 /h with an initial feed temperature of 60/75ºC. Both investment and
operating costs were analysed as well as the impact of retention and operating
conditions on the ultrafiltration process. It was revealed that operating
temperature and membrane selection/retention had an impact on both the
investment and operating costs. In conclusion, the results show that ultrafiltration
is an attractive process unit in the hemicelluloses isolation process.