3.2 Membrane filtration
Membrane filtration of process water in textile industry has previously been reported as successful 19,101, the latter reporting research on process water from reactive dyeing. Our research focused on RO, nanofiltration, and tight ultrafiltration membranes, and a total of 10 different membranes was selected and tested. The general picture of the experiences is illustrated in Table 2.
Polysulphone nanofiltration membranes having a negatively charged polyamide coating(presumably carboxylated) were found to have