REVERSE OSMOTIC MEMBRANE MODULE AND TREATMENT OF SEA WATER

摘要

PROBLEM TO BE SOLVED: To provide a reverse osmotic membrane module capable of obtaining a permeated water of low boron content safely used as a drinking water from sea water with a usual initial cost, equipment and operating condition. SOLUTION: This reverse osmotic membrane module is a module using a composite reverse osmotic membrane using a cross-linked polyamide based compound produced by the cross-linking reaction of a compound having >=2 reactive amino groups with a polyfunctional halide as a skin layer B and has <=1×10<-6> m/sec boron permeation coefficient under 4.5 mg/l raw water boron concentration at 25 deg.C and pH 6.5 by heat treatment.