Hydranautics – Ultrafiltration, Nanofiltration, & Reverse Osmosis



Filtration is a process of removing particulate matter from water by forcing the water through a porous media. The size of materials that can be removed during filtration depends upon the size of the pores of the filter. While conventional filtration could only do particle filtration, membrane filtration such as ultrafiltration, nanofiltration, and reverse osmosis is nowly needed to deliver high standard of water in many industries. Below is general description about substances that could be removed using various methods of membrane filtration. Contact TriotirtaCare to discuss which membrane filtration and other water treatment design that will fit your water needs.

An ultrafiltration filter has a pore size around 0.01 micron. A microfiltration filter has a pore size around 0.1 micron, so when water undergoes microfiltration, bacterias and protozoas are removed, but viruses remain in the water. Neither microfiltration nor ultrafiltration can remove dissolved substances unless they are first adsorbed (with activated carbon) or coagulated (with alum or iron salts).

A nanofiltration filter has a pore size around 0.001 micron. Nanofiltration removes most organic molecules, nearly all viruses, most of the natural organic matter and a range of salts.  Nanofiltration removes divalent ions, which make water hard, so nanofiltration is often used to soften hard water. However, nanofiltration does not remove dissolved compounds.

Reverse osmosis filters have a pore size around 0.0001 micron. After water passes through a reverse osmosis filter, it is essentially pure water. In addition to removing all organic molecules and viruses, reverse osmosis also removes most minerals that are present in the water. Reverse  osmosis removes monovalent ions, which means that it desalinates the water.

Reverse Osmosis Cost Efficieny

Since it was first introduced in the 1950s, reverse osmosis has most commonly been used for purifying water and removing salts and other impurities in order to improve the color, taste or properties of the fluid for potability. However, RO is finding increasing uses in industrial applications because of its effectiveness and cost-efficiency, both investment cost and operating especially if compared with ion exchange methods. For investment cost comparison, the prices of acid and caustic solutions continue to rise while the prices of RO units and membrane elements continue to decrease.

Operating efficiency differs between ion exchange beds and RO systems. Cation and anion resin beds must be regenerated once they reach a set exchange capacity. Their efficiency is related directly to the amount of dissolved solids that pass through the system. Conversely, the operating cost for RO does not vary with the level of dissolved solids in the feed water since the operating cost is based on flow rate. An RO system does not require significant downtime with the exception of quarterly or semi-annual routine maintenance. And RO systems are highly automated, requiring minimal operator interaction. By contrast, during regeneration, which can take up to twelve hours, ion exchange equipment cannot be used and the plant is forced to stop water production.

The primary cost for operating RO systems is electricity and the membranes replacement after a few years. Since these systems consume only very little energy, the operating cost are relatively low. For membranes itself, the right membrane selection that will be adjusted to raw water quality, the right pretreatment method, and the right cleaning chemical and procedure will affect membranes’ age. This proper procedure is the answer why the membranes could last so long and perform like new with minimum  maintenance even after years of operation. Contact TriotirtaCare that is supported by Hydranautics, one of world leading membrane manufacturers from Japan, to ensure you get the best recommendation toward your reverse osmosis design.

Reverse Osmosis Industrial Applications

Reverse osmosis systems can be used to treat boiler feed water, industrial wastewater, process water and more. A few of the major uses are:

  • Boiler Feed Water Treatment: RO is used to reduce the solids content of waters prior to feeding into boilers for the power generation and other industries.
  • Pharmaceutical: Reverse osmosis is an approved treatment process for the production of United States Pharmacopeia (USP) grade water for pharmaceutical applications.
  • Food & Beverage: Water used to process food products and to produce beverages is often treated by a reverse osmosis system.
  • Semiconductor: Reverse osmosis is an accepted component of a treatment process to produce ultrapure water in the semiconductor industry.
  • Metal Finishing: RO systems have been successfully applied to a variety of metal finishing operations including several types of copper, nickel and zinc electroplating, nickel acetate seal, and black dye.

About Hydranautics

Since its founding in 1963, Hydranautics has been committed to the highest standards of technology research, product excellence and customer satisfaction. Hydranautics entered the reverse osmosis (RO) water treatment field in 1970, and is now one of the most respected and experienced firms in the membrane separations industry.

  • Research and Development

Utilizing two R&D centers in US and Japan, Hydranautics’ consistent focus on technology continues to produce the most innovative and effective membrane products for the water treatment industry.

  • ISO 9001:2000 certified Quality Management System

Hydranautics is the first membrane manufacturer to meet the highest quality standards with ISO 9001 Quality System Certification.

  • Highest Performance Products

Hydranautics’ ongoing commitment to the water treatment industry is exemplified by continuously pushing the envelope on membrane performance.

Hydranautics Membranes

Hydranautics membranes are available for wide range of applications: from bottled water industry, waste water, boiler make-up water, semiconductor manufacture, light industrial, seawater desalination, to municipal water treatment. Contact TriotirtaCare that is supported by Hydranautics, to get the best recommendation of membrane selection.

1. Reverse Osmosis (RO): CPA, ESPA, LFC, SWC, SANRO


2. Nano Filtration (NF): ESNA, NANOSW, HYDRAcore


3.Ultra Filtration (UF): HYDRAcap, HYDRAcapMAX, NTU3306K6R