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High-recovery desalination using pressure-driven membranes

A desalination and pressure vessel technology, applied in the field of desalination using pressure-driven membranes to achieve high recovery rates, can solve problems such as scaling and water hammer in downstream concentrate pipelines

Active Publication Date: 2019-10-08
BEN GURION UNIVERSITY OF THE NEGEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This improved method solves the problem that the following dangers exist when the pressure vessel section is transposed between the last stage and the previous stage in the process of multi-stage desalination using pressure-driven membranes: a) occurs due to the change of the flow rate of each stage water hammer; and b) fouling in the concentrate line downstream of the pressure maintenance device on the supply side of the membrane element

Method used

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  • High-recovery desalination using pressure-driven membranes
  • High-recovery desalination using pressure-driven membranes
  • High-recovery desalination using pressure-driven membranes

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Embodiment Construction

[0105] One of the objectives of the present invention is to provide a technical solution to solve multiple operational problems that may arise during the practice of EP1691915 and the pressure valve transposition scheme disclosed in EP1893325 by using a novel valve arrangement. In particular, the device of the invention is used to prevent fouling in the pipeline downstream of the positioning valve downstream of the pressure vessel in the last stage of the supersaturated concentrate which is always subject to supersaturated liquid. The present invention also provides an improved design for protecting the membrane elements in the pressure vessel in an upstream stage from water hammer or other hydraulic shock when moving the pressure vessel section out of and into that stage. In both cases, the novel valve arrangements are used in ways not contemplated or practiced by those skilled in the art of permeable membrane systems.

[0106] The novel valve arrangement of the present inven...

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Abstract

A system and method for switching between aqueous solution flows through multiple sets of membrane pressure vessel segments connected in parallel in a conical flow path system, wherein the system includes a system inlet supply line, a system outlet flow path line, a high pressure booster pump configured to provide a high pressure feed liquid flow to the system; a membrane pressure vessel section arranged in parallel, and first and second bypass lines respectively connected in parallel with the section.

Description

Background technique [0001] In a cross-flow pressure-driven membrane desalination system, the feed stream is typically fed into the high-pressure inlet of a pressure vessel that directs a pressurized brine solution in a flow path parallel to the membranes in the membrane elements, and a portion of the water passes through the connection The low pressure connection from the pressure vessel passes through the membrane and out. The remaining saline solution containing the increased concentration of retained solutes can flow from a second high pressure connection connected from the pressure vessel, indicated by the concentrate port (see Figure 1). [0002] Figure 1A and 1B A cross-flow pressure vessel for pressure-driven membrane desalination related to the prior art (EP1691915), showing the flow path arrangement in co-current (1A) and counter-current (1B) processes, where the flow through the membrane is continuously eliminated Simultaneously with the low pressure product stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/00B01D63/00B01D65/02
CPCB01D61/08B01D61/02B01D61/12B01D65/02B01D2317/04B01D2321/02C02F1/44C02F2103/08C02F2201/007C02F2301/043Y02A20/131
Inventor J.吉尔罗恩D.佩莱德Y.戈德凯恩S.布莱希
Owner BEN GURION UNIVERSITY OF THE NEGEV