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High recovery variable volume reverse osmosis membrane system

A reverse osmosis and volumetric technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, osmosis/dialysis water/sewage treatment, etc., can solve the problems of chemical limitations and other issues

Active Publication Date: 2021-06-04
VEOLIA WATER SOLUTIONS & TECH SUPPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although chemicals can be used to slow down the fouling initiation time, these chemicals have limitations

Method used

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  • High recovery variable volume reverse osmosis membrane system
  • High recovery variable volume reverse osmosis membrane system
  • High recovery variable volume reverse osmosis membrane system

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Embodiment Construction

[0014] The recovery rate of an RO system depends on the number of times (cycles) the feedwater passes through the RO unit. For example, if the RO system is operating at a recovery rate of 50% per pass, the time required to increase the concentration depends on the system volume, and the total recovery rate depends on the number of cycles of the feedwater through the RO system. The following example illustrates this principle.

[0015] - For 80% recovery, the feed water is circulated through the system 5 cycles.

[0016] - For 90% recovery, the feed water is circulated through the system 10 cycles.

[0017] - For 95% recovery, the feed water is circulated through the system 20 cycles.

[0018] - For 98% recovery, the feed water was circulated through the system 50 cycles.

[0019] So, if the cycle time for a particular system is two minutes, the total time is 100 minutes for 98% recovery. For 95% recovery, the total time was 40 minutes. These are longer cycle times and may...

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Abstract

A high recovery variable volume reverse osmosis system where the volume of concentrate cycled through the RO system is reduced in response to recovery levels increasing. By reducing the volume of concentrate cycled through the RO system, this reduces the cycle time of highly saturated concentrate passing through the RO system. Reducing the cycle time of concentrate passing through the RO system tends to minimize or reduce membrane scaling.

Description

[0001] field of invention [0002] The invention relates to a high recovery rate reverse osmosis (Reverse Osmosis, RO) membrane system. Background technique [0003] Fouling of membranes in RO systems is a serious problem. Fouling occurs when inorganic salts in the concentrate (such as calcium carbonate, calcium sulfate, barium sulfate, etc.) precipitate and deposit on the membrane surface. Fouling can lead to membrane plugging. Clogged membranes result in higher energy consumption and shorter membrane life. Additionally, fouled membranes require frequent cleaning (both on-line and off-line), some of which require chemical cleaning. Cleaning and the downtime associated with cleaning are expensive. [0004] RO systems typically operate at 50-75% recovery. It is difficult to consistently achieve high recovery rates of about 80-95%. At such high recovery rates, the concentrate circulating through the RO system becomes supersaturated with fouling components. Continuous circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D61/02B01D65/08B01D61/06
CPCC02F1/441C02F2303/22B01D61/025B01D65/08B01D61/06B01D61/12B01D2311/08B01D2313/083B01D2313/246C02F2301/08B01D2311/2523B01D2313/502B01D2311/2512B01D61/08B01D2313/501B01D65/02B01D61/10B01D2313/18B01D2313/243B01D2313/30
Inventor B·R·马克K·罗林斯
Owner VEOLIA WATER SOLUTIONS & TECH SUPPORT