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Process and apparatus for blending product liquid from different tfc membranes

A technology for aquatic products and primary membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low efficiency and high cost

Inactive Publication Date: 2006-02-15
CULLIGAN INTERNATINOAL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the membrane method already removes the minerals present in the first stage, the latter method is undesirable due to its high cost and low efficiency

Method used

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  • Process and apparatus for blending product liquid from different tfc membranes
  • Process and apparatus for blending product liquid from different tfc membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Determine acceptable hardness and alkalinity ranges for product water by varying the number of reverse osmosis units and nanofiltration units. As we all know, the upper limit of hardness and alkalinity in the prior art is 100ppm. After tasting by tasters, it was found that the product water with a hardness of at least 20 ppm and an alkalinity of at least 21 ppm was superior to product water with lower hardness and alkalinity.

Embodiment 2

[0053] Determining the quality of product water produced by a functional membrane.

[0054] Culligan RO-A6 series reverse osmosis membranes were purchased from Culligan International Company, Northbrook, IL. Flimtec NF-255 nanofiltration membranes and Filmtec NF-45 nanofiltration membranes were purchased from Flimtec Corporation, Minneapolis, Minnesota. By way of illustration, it can be estimated that the permeability or porosity of the nanofiltration membrane is greater than that of the reverse osmosis membrane, and correspondingly the concentration of solute solids is also greater than that of the reverse osmosis membrane.

[0055] In each experiment, a total of six membranes were used to produce product water: two sets or sets of membranes with a total of three identical membranes in each set or set. The mantle can be inserted or removed to change the membrane combination. The influent water used in each set of experiments was from the same water source. After one hour o...

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Abstract

A process and apparatus for membrane treatment includes feeding a liquid to a membrane. The primary membrane separates the feed into a primary membrane retentate and a primary membrane permeate. The primary membrane retentate is fed supplemental primary membranes or to a secondary membrane. The primary membrane retentate is separated by the secondary membrane into a secondary membrane retentate, and a secondary membrane permeate. The secondary membrane retentate may either be discarded, or may be fed to supplemental secondary membranes. If the secondary membrane retentate is fed to a supplemental secondary membrane, the secondary membrane retentate is separated into a supplemental secondary membrane retentate and supplemental secondary membrane permeate. The product liquid is formed by blending the primary membrane permeate with the secondary membrane permeate and all supplemental primary membrane permeates and supplemental secondary membrane permeates.

Description

technical field [0001] The present invention generally relates to a water treatment method and device that adopts membrane technology to separate components in the feed liquid, and particularly relates to a method that utilizes one or more first membrane units with first permeability, and a series of One or more second membrane units of second osmosis, method and apparatus for purifying and blending aqueous solutions to produce a desired blended product water thereby improving the taste characteristics of the water. Background technique [0002] For a better understanding of the description and claims of the present invention, the following concepts are defined. [0003] Thin-Film Composite Membrane (TFC) method: The liquid is purified using a thin-film composite membrane, whereby the influent is separated into retentate and permeate. [0004] Retentate: The portion of the feed that is retained by the membrane. [0005] Permeate: The portion of the feed that passes through...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02C02F1/44B01D61/58B01D61/08B01D61/12
CPCC02F1/44C02F1/441B01D61/022C02F1/442B01D61/029B01D61/58B82Y40/00
Inventor 巴里·H·李吉恩·韦曼约翰·范纽恩希曾
Owner CULLIGAN INTERNATINOAL COMPANY