The　hollow　fiber　ultrafiltration　membrane　with　inner　skin　was　prepared　by　controlling　the　external　coagulation　condition　from　one　or　two　polymer　dopes　with　dual　or　triple-orifice　spinneret.　It　was　successfully　used　for　the　treatment　of　the　wastewater　from　banknote　printing　works　after　characterizing　the　foulant　and　finding　a　suitable　cleaning　method,　for　the　preparation　of　polyaluminum　chloride　(PAC)　with　high　Alb　content　and　the　synthesis　of　nanosized　BaSO4　and　CaCO3　particles　by　a　membrane　reactor.