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HIGH PERFORMANCE WATER TREATMENT

RODI Systems Blog

Benefits and Features of the PureBox™ DLX Self-Contained Portable Desalination System

1/20/2020

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RODI Systems’ PureBox™ DLX portable desalination systems are built inside intermodal dry cargo shipping containers that have been specifically modified for water treatment applications. These fully self-contained, fully functional desalination systems can be delivered to a site and put into operation with a minimum of site preparation, making this system a cost-effective way to produce pure water from seawater.

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Project Spotlight: Cajun Controls LLC

12/5/2019

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Client: Cajun Controls LLC
Location: Port Arthur, Texas, USA
Application: Reverse osmosis brackish water treatment for boiler feed
Cajun Controls, LLC was searching for a mobile reverse osmosis desalination plant capable of producing 2,000,000 gallons per day of permeate, used to feed boilers in a petroleum refinery.

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Serving Power Plants in South America

8/15/2017

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RODI Systems continues to serve its customers' needs in South America. Here are three additional containerized 20 m3/hr RO-EDI systems awaiting shipment to power plants in Argentina.

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Interested in learning more about RODI Systems' water treatment systems? Contact us today!
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Containerized Water Treatment for Power Plants in Argentina

7/17/2017

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RODI Systems has successfully delivered and commissioned two containerized high purity water treatment systems for power plant applications in Argentina. The 20 m3/hr plants utilize ceramic microfiltration (www.cembrane.com), two-pass RO, decarbonation, and EDI to provide high purity water for injection into the air inlets of combustion turbines.

These plants were designed, fabricated, and delivered EXW within 100 days of receiving the order.

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Interested in learning more about RODI Systems' water treatment systems? Contact us today!
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Understanding  RO Membranes Element Construction

6/1/2017

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In order to operate and maintain RO systems properly, it is important for technicians to understand the construction of the RO membrane elements.  RO membranes use a cross-flow filtration technique, where only a portion of the water passes through the membrane.  The remaining flow passes across the membrane and through the treatment system as waste (also called concentrate, reject or brine).  This waste- or concentrate-flow is necessary to keep fouling materials from building up too rapidly on the surface of the membrane.  The cross-flow membrane treatment systems have one feed stream entering the system, one concentrate stream and one permeate stream (purified water) leaving the system.

Any membrane treatment technique is limited by the amount of water that can be forced through a given area of membrane in a given amount of time.  This flow, referred to as the membrane flux rate, is often reported in gallons per square foot per day (GFD).  For a treatment system to be able to treat more water, more membrane must be present.  The membrane is used under pressure, so it must be enclosed inside a pressure vessel (PV). For the sake of economy, the volume of these PVs must be as low as possible.  The goal is to put as much membrane in as small a volume as possible while still making provisions for feeding water to the membrane surface and removing concentrate and permeate.

While RO membranes are available in a number of configurations, one of the most common is the spiral wound.  In this design, two flat sheets of membrane are glued together back-to-back to form an envelope.  Inside the envelope is a porous sheet of material called a permeate carrier.  The envelope is glued together on three sides.  The fourth side of the envelope is attached to a perforated permeate tube. The only way water (permeate) can exit the envelope is through this tube.
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During operation the feedwater (under pressure) flows across the membrane surface on both sides of the envelope. Water, which permeates through the membrane, flows along the permeate carrier toward the open end of the envelope and exits through the permeate tube.

In large industrial systems several envelopes are attached to the perforated permeate tube in such a way that the permeate exiting the envelopes has to enter the same permeate tube.  The envelopes are then wrapped, or wound, around the permeate tube to form a cylindrical membrane element.  Before the envelopes are wrapped, a mesh feed spacer is placed between the envelopes.
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The feed spacer is necessary to provide a space between membrane envelopes after the envelopes are wrapped into the spiral wound configuration.  This space, called the feed channel, allows the feedwater to flow evenly through the element from one end to the other.

Elements are placed end-to-end in a cylindrical pressure vessel (PV).  The permeate tubes of each element are connected to form a permeate channel which allows the permeate from the collective elements to exit one end of the PV.  Feedwater enters one end of the PV, and concentrate exits the other.  A typical industrial element is 8” in diameter by 40” in length.  PVs may hold one to eight elements, with six being the average.  RO systems may have from one to hundreds of PVs.
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RODI Systems Corporation
936 Highway 516, Aztec, NM 87410
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  • Home
  • Products
    • RODI Products
    • Ceramic Membrane
    • Chemical Feed Systems
    • Controllers & Instruments
    • Custom Controllers
    • Desalination Systems
    • High Purity Systems
    • Silt Density Monitors
    • Wastewater Treatment Systems
    • Water Purification Systems
    • Water Treatment for Hydrogen Production
  • About Us
    • About RODI
    • RODI Projects
    • RODI Customers
    • Industries
    • Technologies
  • Get Support
    • Technical Support
    • How To Buy Standard Products
  • Contact RODI
  • Resources
    • How Does Reverse Osmosis Work?
    • What is Desalination?
  • Blog