Method and apparatus for treatment of concentrated reverse osmosis drainage through coupled forward osmosis and reverse osmosis

A technology of reverse osmosis concentrated drainage and forward osmosis, which is used in osmosis/dialysis water/sewage treatment, chemical instruments and methods, semi-permeable membrane separation, etc. , the effect of simple operation and low energy consumption

Inactive Publication Date: 2012-10-24
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This treatment process is similar to the addition of antiscalants, and cannot remove all the salt in the water
[0009] To sum up, the current reverse osmosis concentrated wastewater treatment process is basically by adding antiscalants an

Method used

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  • Method and apparatus for treatment of concentrated reverse osmosis drainage through coupled forward osmosis and reverse osmosis
  • Method and apparatus for treatment of concentrated reverse osmosis drainage through coupled forward osmosis and reverse osmosis

Examples

Experimental program
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Embodiment 1

[0044] In this embodiment, the device for treating reverse osmosis concentrated wastewater with forward osmosis coupled with reverse osmosis adopts a primary treatment device (such as figure 1 Shown), the forward osmosis stock solution is concentrated, and the reverse osmosis concentrated wastewater is recycled and reused. Wherein, the primary processing device includes:

[0045] The first forward osmosis stock solution pool 1 for accumulating forward osmosis stock solution;

[0046] A reverse osmosis concentrated drainage storage tank 5 for accumulating reverse osmosis concentrated drainage;

[0047] The first forward osmosis stock solution feed pump 2 is used to transport the forward osmosis stock solution to the first forward osmosis component 3;

[0048] The feed pump 7 is used to transport the first reverse osmosis concentrated drainage 4 as the forward osmosis drive fluid to the forward osmosis module 3;

[0049] Forward osmosis component 3, according to the principle...

Embodiment 2

[0060] According to the method of Example 1, the difference from the above example 1 is that the flow mode is cross flow, and the concentrated product shown is a whey protein solution that is more sensitive to temperature, wherein the whey protein concentration is 3% (mass Concentration), the volume is 100L, operating at room temperature, the flow velocity inside and outside the forward osmosis membrane (forward osmosis stock solution, the flow velocity of the first reverse osmosis concentrated drainage 4) is 1m / s, reverse osmosis concentrated drainage (reverse osmosis seawater desalination Concentrated wastewater) with a volume of 100L. After 2 hours of treatment, the protein concentration was concentrated to 6%. After the reverse osmosis concentrated wastewater was diluted, the mass concentration was reduced to 7% (the concentration of seawater is calculated by sodium chloride content and measured with a salinity meter. ), the diluted drive solution (that is, the diluted reve...

Embodiment 3

[0062] According to the method of Example 1, the difference from the above Example 1 is that the concentration process shown is seawater concentration, the mass concentration of seawater is 3.5%, and the volume is 100L. It is operated at room temperature, and the reverse osmosis concentrated drainage volume is 100L. , the treatment time is 3 hours, the flow velocity inside and outside the forward osmosis membrane (the flow velocity of the forward osmosis stock solution and the first reverse osmosis concentrated drainage 4) is 2m / s, and the seawater concentration is concentrated to 6.3%. After the reverse osmosis concentrated drainage is diluted, the mass concentration is reduced to 7% (the concentration of seawater is calculated by the content of sodium chloride and measured with a salinity meter), and the diluted drive solution is mixed with reverse osmosis raw water 10% (the reverse osmosis raw water here is 10% Sea water) is mixed with a volume ratio of 1:4 as the feed water...

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Abstract

The invention discloses a method and an apparatus for treatment of a concentrated reverse osmosis drainage through coupled forward osmosis and reverse osmosis. The method comprises the following steps that: a raw forward osmosis solution directly enters into a forward osmosis assembly, a concentrated reverse osmosis drainage is used as a driving solution for forward osmosis, water of the raw forward osmosis solution permeates a membrane, the concentrated reverse osmosis drain is diluted and then mixed with raw reverse osmosis water, then flows through a high-pressure pump and enters into a reverse osmosis assembly as inflowing reverse osmosis water, water penetrating to one side of the driving solution from the raw forward osmosis solution is recycled through reverse osmosis, and the concentrated reverse osmosis drainage is circulated as the driving solution for forward osmosis. The apparatus comprises a first feed pump, a second feed pump, the forward osmosis assembly, the high-pressure pump and the reverse osmosis assembly. According to the invention, the utilization rate of the concentrated reverse osmosis drain can be increased; pollution of the concentrated reverse osmosis drainage to the environment can be reduced; the method and the apparatus can also be used for liquid concentration and desalination, producing significant economic values; and the apparatus provided by the invention has the advantages of a small occupied land area, a compact structure, simple operation, low running cost and low energy consumption.

Description

technical field [0001] The invention relates to a method and a device for treating reverse osmosis concentrated drainage, in particular to a method and a device for treating reverse osmosis concentrated drainage with forward osmosis coupled with reverse osmosis. Background technique [0002] Water shortage, environmental pollution and energy crisis are the major problems facing the world at present. In the fields of seawater desalination and sewage recycling, membrane technology has become a conventional separation technology. Among them, reverse osmosis membrane technology has been widely used. In the reverse osmosis process, driven by external pressure, water molecules pass through the reverse osmosis membrane to obtain pure water. For high salt water sources, such as sea water, brackish water, etc., the external pressure needs to overcome the high osmotic pressure to obtain pure water. At the same time, a large amount of high-salt wastewater is produced. If the high sa...

Claims

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Application Information

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IPC IPC(8): C02F1/44B01D61/58
CPCY02A20/131
Inventor 何涛李雪梅许高杰姜标
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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