Softener Data PB0103NS.qxd - Eco-Tec

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Recoflo ® ion exchange features ... The Recoflo Softener is able to achieve a high level of efficiency and performance by employing several design and operational features. 1. Short bed height/small resin volume - The resin bed in the Recoflo Softener is only 6 inches (15 cm) in depth and has approximately 10% of the CONVENTIONAL resin volume of other softeners (Figure 1). The use of the shallow bed is made possible by the rapid ion exchange kinetics RECOFLO ® that result from the use of fine mesh resins and low resin loading. This small resin inventory allows for the inexpensive, simple, and expeditious replacement of resin. Figure 1: Resin volume comparison 2. Low resin loading - Unlike other softeners that load the resin to near exhaustion, the Recoflo Softener uses less than 20% of the total exchange capacity of the resin. By using only the most accessible exchange sites at the surface of the resin beads, the exchange kinetics are improved and the brine usage is reduced since the sites that most readily accept an ion are those that are most easily regenerated. In addition, the low resin loading does not force the resin to undergo large changes in size that result in resin fragmentation in other softeners. 3. Fine mesh cation resin - Since exchange kinetics and regeneration efficiency are improved by using only the exchange sites at surface of the resin beads, a fine mesh resin is used to increase the total surface area that is available for exchange. The size of these resin beads is approximately one quarter the size of the resin used in other softeners (Figure 2). The resin is uniformally sized to maximize the efficiency of rinsing and promote uniform distribution of flow through the bed. Figure 2: Resin bead size comparison CONVENTIONAL RECOFLO ® ▲ ▲ 4. Counter-current regeneration - To maintain the cleanest resin at the bottom of the resin bed after regeneration, the brine regenerant is passed through the bed in the opposite direction of the feed flow (Figure 3). Counter-current regeneration minimizes brine usage and maximizes softened water quality. 5. Compressed resin beds - The resin bed in the Recoflo Softener is fully packed such that no freeboard exists. In
Recoflo ® ion exchange features ... FEED WATER PRODUCT WATER Figure 3: Counter-current regeneration fact, the resin bed is compressed by adding an excess of resin prior to closing the vessel (Figure 4). Compressed resin beds maximize regeneration efficiency by maintaining the exchange zone profile and ensuring proper flow distribution through the resin bed. Eliminating the freeboard reduces rinse requirements by minimizing intermixing and liquid dilution. WASTE REGENERANT Figure 4: Recoflo Softeners compressed resin bed 7. Shorter cycle times - The combination of high flowrates, low resin loading, and small resin beds result in short cycle times, both in service and regeneration. Whereas other softeners are onstream for approximately 20 hours and require several hours to regenerate, the Recoflo Softener is typically onstream for less than 30 minutes and is regenerated in less than 2 minutes. The shorter cycles allow for the continuous supply of the required flow with only one unit since during the short regeneration period, water can be drawn from the product storage tank. This buffer volume, and the softened water used for regeneration, can then be replaced during the subsequent onstream cycle. The shorter cycles allow for smaller waste piping and holding facilities since small amounts of waste are generated throughout the day rather than the large volume of waste generated daily by other softeners The shorter cycles also facilitate troubleshooting since many cycles can be witnessed in a single shift after the remedial action has been performed. 6. Higher throughput rates - The rapid ion exchange kinetics and short resin bed allow for high throughput rates, typically two to three times higher than used in other softeners. The high flowrates result in a smaller resin bed diameter and hence up to a 50% reduction in the required amount of floorspace.
Page 1: PB0103NS RECOFLO ® WATER SOFTENER
Page 5: Cycle steps ... 1. ONSTREAM Pre-fil

Softener Data PB0103NS.qxd - Eco-Tec

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