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RODI Systems has more than 20 years experience in designing and fabricating water purification, desalination, and wastewater treatment systems. Our experience includes some of the most challenging water treatment applications.
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At RODI we know there's no 'silver bullet' for demanding applications and we're here to create an integrated approach utilizing multiple treatment technologies. We specialize in the use of high performance membrane technologies and we use conventional technologies where warranted by cost and performance needs." |
What We Do |
Our Products |
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As a worldwide leader in the design and fabrication of high performance water treatment systems, RODI Systems utilizes Membrane Filtration, Reverse Osmosis, Electrodeionization and other best available water treatment technologies. to create solutions for a wide range of industrial applications.
Our products help process more than 1.5 billion gallons of water every day in industries such as food and beverage processing, power generation, oil and gas production, desalination and more. State-of-the-Art Membrane Technology |
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RODI Systems utilizes the latest evolution of filtration with silicon carbide ceramic membranes by Cembrane.
Silicon carbide is one of the ten most durable materials known to man. In addition to its incredible hardness, it also demonstrates:
When used in membranes for water treatment, silicon carbide provides an exceptional resistance to chemicals and an ability to withstand elevated temperatures and repeated exposure to high pH liquids, oxidizing agents, solvents and other harsh chemicals. As such, the membranes are immensely dependable, resilient and long-lasting. These membranes also have the highest flux rate of any membrane material, making them extremely effective for filtering (0.1 micron). Uniquely, these silicon carbide ceramic membranes also have a strong negative charge, making them highly repellent to just the types of organisms and materials that typically foul membrane filtration systems. This results in superior fouling resistance. |
RODI Systems is an authorized North American Supplier of silicon carbide ceramic membranes by Cembrane. |
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This membrane technology produces superior results in a number of applications including membrane bioreactors, tertiary sewage treatment, groundwater treatment, media filter backwash recovery, and pretreatment for ultrafiltration, reverse osmosis, and nanofiltration systems. It can often eliminate the need for a clarifier while producing filtrate of exceptional quality (less than 0.1 micron particle size).
The modular design of the Cembrane product provides great flexibility in sizing. Less space is needed for systems using this membrane technology because they can be used individually or stacked. Design of the submerged filtration systems using the Cembrane product is more simple than a comparable pressurized filtration system. |
POLYMERIC MICROFILTRATION AND ULTRAFILTRATION MEMBRANES
RODI makes use of polymeric microfiltration and ultrafiltration membrane products for applications that do not demand the durability of the ceramic membrane or for those applications that require finer filtration capability. Hollow fiber (outside - in) microfiltration membrane elements are often used on naturally occurring surface water, both fresh and seawater. Hollow fiber (inside - out) ultrafiltration membrane elements may be coupled with the silicon ceramic membrane as pretreatment.
REVERSE OSMOSIS AND NANOFILTRATION MEMBRANES
Very few water treatment technologies are capable of removing dissolved salts. Pressure driven membrane technologies such as reverse osmosis (RO) and nanofiltration (NF) are less expensive than distillation technologies, however, they are generally limited to feed water dissolved solids concentrations of less than 60,000 ppm. RO and NF also require extensive pretreatment to avoid membrane fouling. Nevertheless, these are very capable and useful technologies when applied properly.
SOLVENT EXCHANGE
Removal of inorganic dissolved solids from feed waters containing more than 60,000 ppm will typically require a distillation method. Operating costs for most distillation technologies tend to be high since it involves a phase change. Capital costs also tend to be high since exotic metals are necessary due to the high salt concentration and high temperatures involved. RODI Systems (RODI) is now involved with a new and unique desalination technology for high TDS brines from Aquafortus Technologies, a New Zealand based technology company. The Aquafortus technology is unique in that it can desalinate high TDS brines using a low cost, two-stage solvent exchange process that doesn't require a phase change as does evaporation or humidification / dehumidification technologies.
RODI makes use of polymeric microfiltration and ultrafiltration membrane products for applications that do not demand the durability of the ceramic membrane or for those applications that require finer filtration capability. Hollow fiber (outside - in) microfiltration membrane elements are often used on naturally occurring surface water, both fresh and seawater. Hollow fiber (inside - out) ultrafiltration membrane elements may be coupled with the silicon ceramic membrane as pretreatment.
REVERSE OSMOSIS AND NANOFILTRATION MEMBRANES
Very few water treatment technologies are capable of removing dissolved salts. Pressure driven membrane technologies such as reverse osmosis (RO) and nanofiltration (NF) are less expensive than distillation technologies, however, they are generally limited to feed water dissolved solids concentrations of less than 60,000 ppm. RO and NF also require extensive pretreatment to avoid membrane fouling. Nevertheless, these are very capable and useful technologies when applied properly.
SOLVENT EXCHANGE
Removal of inorganic dissolved solids from feed waters containing more than 60,000 ppm will typically require a distillation method. Operating costs for most distillation technologies tend to be high since it involves a phase change. Capital costs also tend to be high since exotic metals are necessary due to the high salt concentration and high temperatures involved. RODI Systems (RODI) is now involved with a new and unique desalination technology for high TDS brines from Aquafortus Technologies, a New Zealand based technology company. The Aquafortus technology is unique in that it can desalinate high TDS brines using a low cost, two-stage solvent exchange process that doesn't require a phase change as does evaporation or humidification / dehumidification technologies.
Other Technologies Employed by RODI Systems
PLC AND HMI TECHNOLOGY
RODI's products are engineered with automation in mind. Our controls utilize PLC (programmable logic controller) systems to control motors, pumps, valves and other equipment used in treatment processes. We also employ computer-based HMI (human machine interface) systems to allow personnel to interact with the PLC control system.
CONVENTIONAL PHYSICAL SEPARATION TECHNOLOGY
Conventional physical separation technologies include media filtration, clarification, dissolved air filtration, and oil water separation. These treatment methods are generally inexpensive and are useful for removing gross amounts of insoluble organic and inorganic contaminants. The physical separation methods are most often used in conjunction with chemical flocculation and coagulation technologies.
ABSORPTION AND ADSORPTION
These techniques are used for certain dissolved organics and inorganics and involve the use of a solid sorbent to remove the contaminants. Capital costs are generally low but media (sorbent) replacement costs can be significant.
CHEMICAL OXIDATION
Chemical oxidation can be effective at removing certain organic contaminants or converting metals to metal oxides which can then be removed by conventional separation methods or with membrane treatment. Typical chemical oxidants include chlorine, chlorine dioxide, and ozone.
BIOLOGICAL OXIDATION
Biological oxidation is most commonly used for domestic waste (sewage) treatment although it can also be employed for reduction of organic contaminants in industrial waste. Membrane technologies (such as ceramic microfiltration) or physical separation methods are used in conjunction with biological oxidation to remove the biosolids from the oxidizing liquor.
RODI's products are engineered with automation in mind. Our controls utilize PLC (programmable logic controller) systems to control motors, pumps, valves and other equipment used in treatment processes. We also employ computer-based HMI (human machine interface) systems to allow personnel to interact with the PLC control system.
CONVENTIONAL PHYSICAL SEPARATION TECHNOLOGY
Conventional physical separation technologies include media filtration, clarification, dissolved air filtration, and oil water separation. These treatment methods are generally inexpensive and are useful for removing gross amounts of insoluble organic and inorganic contaminants. The physical separation methods are most often used in conjunction with chemical flocculation and coagulation technologies.
ABSORPTION AND ADSORPTION
These techniques are used for certain dissolved organics and inorganics and involve the use of a solid sorbent to remove the contaminants. Capital costs are generally low but media (sorbent) replacement costs can be significant.
CHEMICAL OXIDATION
Chemical oxidation can be effective at removing certain organic contaminants or converting metals to metal oxides which can then be removed by conventional separation methods or with membrane treatment. Typical chemical oxidants include chlorine, chlorine dioxide, and ozone.
BIOLOGICAL OXIDATION
Biological oxidation is most commonly used for domestic waste (sewage) treatment although it can also be employed for reduction of organic contaminants in industrial waste. Membrane technologies (such as ceramic microfiltration) or physical separation methods are used in conjunction with biological oxidation to remove the biosolids from the oxidizing liquor.