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High Efficiency Water Purification System

a high-efficiency, water-purification technology, applied in water treatment multi-stage treatment, water/sewage multi-stage treatment, membranes, etc., can solve the problems of fouling of reverse osmosis membranes and limited recovery

Inactive Publication Date: 2012-06-14
WATER INTPROP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0032]An advantage of the present invention is that such a concentrate recovery system can be retrofitted onto existing RO units, as well as incorporated on new RO installations.
[0033]While the preferred embodiment of the present invention ins disclosed in the context of high efficiency water purification systems in general industrial usage, those skilled in the art will appreciate that the principles of the present invention may be applied so as to provide alternate systems based on the principles described herein.

Problems solved by technology

The recovery is limited by sparingly soluble salts which can foul the reverse osmosis membranes.

Method used

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Examples

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Embodiment Construction

[0046]Example systems, methods, processes, and so on are now described. In the following description, for purposes of explanation, numerous specific details are set forth in order to facilitate thoroughly understanding the methods, systems, processes, and so on. It may be evident, however, that the methods, systems and so on can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to simplify description.

[0047]As used in this application, the term “semi-permeable membrane” or “polyamide membrane” refers to thin film composite membranes such as reverse osmosis (RO) or nanofiltration (NF) membranes used to purify water, the soluble inorganic ions such as sodium, potassium, calcium, magnesium, iron, chloride, fluoride, carbonate, bicarbonate, sulfate and silica are separated by the membrane while the water is allowed to permeate or pass through the membrane. These thin film composite membranes genera...

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Abstract

A high efficiency water purification system is provided incorporating a process to recover a portion of the concentrate wastewater associated with the reverse osmosis unit to reduce the overall volume of concentrate wastewater requiring discharge / disposal by reusing the purified concentrate of a concentrate recovery units as RO feed water. The initial municipal feedwater is pressurized and passed through an RO membrane, and separated into a permeate flow and a concentrate flow. After passing through the membrane, a portion of the higher pressure concentrate is then directed to an additional set of thin film composite membranes (concentrate recovery membranes). The concentrate is drawn from the primary RO unit upstream of a concentrate flow control valve where the pressure is typically 100-600 psig. The concentrate recovery membranes are arranged in an array such that the concentrate pressure is adequate to provide the force required to drive the concentrate through the recovery system membranes. The permeate produced by the concentrate recovery system is directed back to the feed of the primary RO unit; thereby, reducing the volume of raw feed water required for system operation. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Description

RELATED APPLICATIONS[0001]None.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to water purification systems for general industrial usage and, more particularly, to a reverse osmosis recovery systems that incorporate recoveries in excess of 85% or utilizing a secondary recovery on the concentrate.[0004]2. Description of the Related Art[0005]Virtually all large municipal water supply systems must treat their water in accordance with an extensive regime of global, federal and state agency regulations. Generally, water treatment occurs before the product reaches the consumer, and then again afterwards (when it is discharged). Water purification usually occurs close to the final delivery points to reduce pumping costs and the chances of the water becoming contaminated after treatment.[0006]Traditional surface water treatment plants generally consists of three steps: clarification, filtration and disinfection. Clarification refers t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C02F1/44
CPCB01D61/022B01D61/04B01D61/58B01D2311/08B01D2311/25B01D2317/022B01D2317/04C02F1/001C02F1/441C02F2103/02C02F2209/40C02F2301/08B01D61/025B01D61/026B01D2311/2512C02F1/44
Inventor HOOLEY, JOSEPHKOVACS, WILLIAM E.
Owner WATER INTPROP
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