PENGENDALIAN SCALING PADA MEMBRAN REVERSE OSMOSIS DENGAN MENGGUNAKAN LARUTAN EDTA

Abstract

Scaling on the membrane surface of the crust of calcium carbonate, calcium sulfate, silica and magnesium silicate is the main problem in membrane system application of reverse osmosis (RO) water purification process. Scaling in RO system are generally controlled by pretreatment of feed water such as softening or by limiting thr level of recovery, where these processes are not practical when applied to the RO system.This research is aimed to look at the possibility of adding antiscalant method can be applied to prevent the occurrence of scaling in RO system. Fixed variable of this research conducted using a spiral wound membrane unit type TW 30-1812-75 operated with the operating pressure of 3 bars. Variables used to change the concentration of EDTA 0.2 g / ml and 0.4 g / ml and the concentration of CaCO3 in the feed that is 1000.1500, 2000 ppm. Result of this research showed the formation of scaling on RO membranes and the addition antiscalant using EDTA solution increases the permeate flow rate. This indicates that the addition of antiscalant is possible to improve the performance of RO membrane system.