To explain why high-flow cartridge filter is selected for RO system, I would like to briefly introduce what is RO system first.
What is RO system?
Wikipedia gives an answer as” Reverse osmosis (RO) system is a water purification process that uses a semi-permeable membrane to separate water molecules from other substances.”. To put it more comprehensible, RO system is a water purification technology that is used to remove a wide range of impurities from water by utilizing a semi-permeable membrane. The process of reverse osmosis involves applying pressure to push water molecules through the membrane while blocking the passage of contaminants, ions, and particles. This results in the separation of clean, purified water from the concentrated waste stream.
To make the RO system process more safety, high-efficiency and cost-effective, Prefiltration is an essential step before the RO system. It helps to reduce or remove the large suspended particles and sediments from the water before going through the reverse osmosis system, which can ensure the RO membranes continue to work at the optimum level.
Basically, the prefiltration process helps RO system in below aspects:
- Particle and Sediment Removal: Feed water often contains suspended particles, sediments, and debris that can clog the RO membrane or cause damage to it. Prefiltration stages, typically using filters like sediment filters, remove these larger particles to prevent them from reaching and clogging the RO membrane.
- Chlorine and Chemical Removal: Chlorine and other chemicals present in the water can damage the RO membrane over time. Prefiltration stages may include activated carbon filters, which help remove chlorine, chloramines, and other organic chemicals that could harm the membrane.
- Protection of RO Membrane: The RO membrane is a delicate and critical component of the system. It is designed to allow only water molecules to pass through while blocking most dissolved solids and contaminants. Prefiltration helps protect the membrane by removing larger particles and substances that could otherwise accumulate on its surface and reduce its efficiency.
- Preventing Fouling and Scaling: RO membranes are susceptible to fouling and scaling due to the presence of minerals and impurities. Prefiltration can help reduce the load of these substances, minimizing the chances of fouling and scaling on the membrane surface.
- Improved Performance: By removing particulates and certain contaminants before they reach the RO membrane, prefiltration helps maintain the optimal flow rate and pressure within the system. This, in turn, improves the overall performance and efficiency of the RO process.
- Extended Membrane Lifespan: Regular exposure to particles, chemicals, and contaminants can lead to premature degradation of the RO membrane. Prefiltration helps extend the lifespan of the membrane, reducing the need for frequent replacements and saving costs in the long run.
Overall, prefiltration is a critical aspect of an RO system’s design. The specific types of prefiltration stages and filters used can vary based on the quality of the feed water and the intended application of the RO system. Proper prefiltration not only ensures better water quality but also contributes to the long-term reliability and effectiveness of the entire RO water purification process.
High-flow cartridge filter and traditional cartridge filter (PP melt blown, string wound) are two of the most commonly used filter elements for prefiltration procedure.
However, due to the following advantages of high-flow cartridge filter compared to the traditional ones, it becomes more and more popular in recent years.
Advantages of high-flow cartridge filter
- Much larger filtration area of up to 8㎡
- Higher flow rate of up to 115m³/h
- Widely micron rating range of 1~100um
- Higher dirt holding capacity due to its special pleated structure
- Longer service life, the outer and inner core make it more stronger
- Easier installation, replacement
- Various end caps to match with different filter housing for project demands
The high-flow filter cartridge is mainly used as the prefiltration for RO system and 5um is normally used. Under the same flow rate, less quantity of filter elements are needed, which brings great convenience to the system maintenance and filter replacement work; Absolute precision filtration characteristics can effectively remove trace suspended solids in water, prevent solid impurities and other particles from entering the RO system, prolong the service life of expensive RO membrane elements, and ensure the operation of RO pure water system and the stability of water production.
What are the applications of the RO system?
Reverse osmosis systems are commonly used for various water purification purposes, including:
- Desalination of seawater and brackish water
- Drinking water
- Water & wastewater treatment
- Food and beverage
It’s worth noting that high-flow cartridge filters are the best choice for large-scale operations considering the specific requirements of RO system including the flow rate, feed water quality, and application demands as well as the cost-effectiveness.