Osmosis is the process of transfer of water from the solution whose concentration
low to high solution concentration due to the pressure
osmosis. This change is through a semipermeable membrane, where the process
transfer of water will stop after the concentration of the two solutions together. RO
requires a hydrostatic pressure greater than the pressure difference
osmotiknya so that water can flow from the solution of higher concentration
through a semipermeable membrane.
RO systems are generally composed of four processes, namely:
1. Early treatment (pretreatment)
Feedwater first processed to fit the conditions of the membrane with
remove suspended solids, adjust pH and add operations
inhibitor to control scaling caused by constituents such as
2. Giving pressure
Feed water that has been processed is increased pressure to pump up
desired operating pressure to conform with the membrane and salinity
3. membrane separation
Semipermeable membrane which inhibits the course of feed water through it.
The water output from the membrane form of water called permeate, and
retained on the membrane is called concentrate. However, since no
membranes that can work 100% perfect, then there is a small portion of salt
which still can pass through the membrane.