Figure 1: Technological scheme
– The source water will be pre-treated with sedimentation works, sand filter tanks to deposit large particles of sediment.
– Raw water after first filtration with sand filter system and protective filter column to remove particles of small size, will be thoroughly treated by RO filter core.
Figure 2: Structure of RO membrane
– RO membranes have a pore size of about 0.001 – 0.0001 Micron; consists of laminated layers or filters which are fastened and rolled together and in a spiral configuration around a plastic core. Membrane materials have special mechanisms that allow water molecules to pass through, but do not allow dissolved solids to pass through (e.g., polluted chemical minerals).
– When the filter core is maintained with sufficient pressure, water molecules penetrate horizontally along the surface of the membrane, around the spiral surface moving along the clean water pipe to the water tank after treatment. Other pollutants from the surface of the membranes are pushed along the exhaust path.
– The system for treated water quality completely removes bacteria and dissolved components contained in water.
– Complex operating system, especially primary water treatment before final treatment with RO membrane.
– High operating costs:
+ Due to high operating pressure of RO membrane, resulting in high pump pressure requirements.
+ Maintenance and replacement costs of high RO membrane, due to low membrane durability.
+ Pump trough parts are used and the pipe is quickly degraded due to always operating at high pressure of about 400 PSI (Approximately 27.57 Bar)
– Pure water from RO filtration technology usually does not retain minerals naturally good for the body such as calcium, magnesium … using pure water long term is not good for health. Therefore, if you want to use this water for eating purposes, you need to add a mineral compensation filter system.
– Because the RO membrane filtration method is reverse osmosis, the final water is usually less than the discarded water (For example, to treat 200 m3 of clean water requires about 400 m3 of raw water).
– Post-treated water does not retain essential minerals for users’ health.
Scope of application:
– RO membrane filters are used to filter seawater, or to supply water to cooling systems that require high water quality.