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Method and device for inhibiting membrane scaling in brackish water desalination treatment

A technology for desalination of brackish water and membrane inhibition, applied in seawater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high frequency of replacement of reverse osmosis membranes, waste of scale inhibitor, and inability to remove adhesions. , to achieve the effect of inhibiting membrane fouling, improving service time and improving effect

Inactive Publication Date: 2020-11-17
SHANDONG SUNWAY LANDSCAPE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method inhibits membrane fouling, it wastes a lot of antiscalant, and only has an inhibitory effect, and cannot remove scaled adherents on the membrane, so the frequency of replacing the reverse osmosis membrane is relatively high

Method used

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  • Method and device for inhibiting membrane scaling in brackish water desalination treatment
  • Method and device for inhibiting membrane scaling in brackish water desalination treatment
  • Method and device for inhibiting membrane scaling in brackish water desalination treatment

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Embodiment 1

[0039] see figure 1 , the present invention provides a technical solution:

[0040] A method for inhibiting membrane scaling in brackish water desalination treatment, comprising the following steps:

[0041] S1. Pretreatment of brackish water: remove colloids, suspended impurities, and reduce turbidity in brackish water by coagulation filtration; select FeCl 3 As a coagulant, the dosage is 1.0-2.5mg / L; after being mixed by a mixer, it is then filtered through a mechanical filter, so that the pollution index of the effluent water quality is <5, and the turbidity is <1;

[0042] S2. Dosing to eliminate residual chlorine: pump 1.5-3.0 mg / L sodium bisulfite through a metering pump, so that residual chlorine in brackish water reacts with sodium bisulfite to form neutral salt; control the concentration of brackish water The pH value is in the range of 7.0-7.5, and the free chlorine is controlled <0.1mg / L;

[0043] S3. Security filtration: set a set of security filters with a filtra...

Embodiment 2

[0054] The difference from Embodiment 1 is that the pulse pump 9 in Embodiment 1 is replaced by a constant pressure pump whose output pressure is 1.10 times of the reverse osmosis pressure. At the same time, the filtration accuracy of the security filter 2 is set to 5 μm. Change the design of the pulse pump 9, and use the constant pressure pump to continuously output to form a stable water film, which is perpendicular to the pressure direction of the osmotic pressure. This method can be used when the concentration of the concentrated solution is relatively high.

Embodiment 3

[0056] The difference from Example 1 is that there is no need to inject the antiscalant and hydrochloric acid separately, and hydrochloric acid is directly added to the antiscalant, and after mixing, it is pumped into the spiral pipeline 408 by a pulse pump at the same time.

[0057] To sum up: the present invention changes the traditional method of directly mixing the scale inhibitor with the raw water. When in use, the scale inhibitor is injected into the spiral pipeline to directly reach the surface of the reverse osmosis membrane module to form a scale inhibitor. The structure of the agent layer improves the inhibitory effect of membrane scaling; and using the reversing solenoid valve, hydrochloric acid can be injected within a specified time to descale the scaled surface, and can further inhibit membrane scaling and improve the efficiency of reverse osmosis membranes. usage time. In the design of the present invention, a pulse pump is also used as the delivery pump of the...

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Abstract

The invention discloses a method for inhibiting membrane scaling in brackish water desalination treatment. The method comprises the following steps: pretreating brackish water, adding chemicals to remove residual chlorine, carrying out security filtration, adding security filtration and pipelines, pumping a scale inhibitor, and pumping hydrochloric acid. The device further comprises an electromagnetic reversing valve, wherein the two inlets of the electromagnetic reversing valve communicate with a scale inhibitor storage box and a hydrochloric acid storage box through anti-corrosion water pipes correspondingly, the outlet of the electromagnetic reversing valve communicates with a pulse pump, a reverse osmosis membrane assembly is arranged on the outer side of an outer security filter core,a spiral pipeline is fixedly connected to a supporting rod, and micropores are formed in the surface of the spiral pipeline. According to the invention, a scale inhibitor is injected into a spiral pipeline and directly reaches the surface of a reverse osmosis membrane assembly to form a scale inhibitor layer structure, so that the inhibition effect of membrane scaling is improved; and hydrochloric acid can be injected within specified time by utilizing a reversing electromagnetic valve, so that the scaled surface is descaled, membrane scaling can be further inhibited, and the service life ofthe reverse osmosis membrane is prolonged.

Description

technical field [0001] The invention relates to the technical field of brackish water desalination, in particular to a method for inhibiting membrane scaling in brackish water desalination treatment, and in particular to a device for inhibiting membrane scaling in brackish water desalination treatment. Background technique [0002] Brackish water refers to water whose alkalinity is greater than hardness, contains a large amount of neutral salts, and has a pH value greater than 7. my country's brackish water is mainly distributed in the northern and eastern coastal areas. Desalination methods for brackish water include: [0003] ①Distillation, distillation is the process of heating brackish water or sea water to boil and evaporate it, and then condensing the steam into fresh water. Distillation is the first method of desalination of brackish water. Its main advantages are simple structure, easy operation and good quality of fresh water. There are many distillation methods,...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01D65/08C02F1/44C02F1/66C02F103/08
CPCB01D65/08B01D2321/162B01D2321/2033C02F1/001C02F1/441C02F1/5245C02F1/66C02F9/00C02F2103/08Y02A20/131
Inventor 王胜
Owner SHANDONG SUNWAY LANDSCAPE TECH
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