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Method for reconcentrating and recycling reverse osmosis concentrated brine in reclaimed water recycling device

A technology of reverse osmosis and concentrated brine, applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of membrane scaling, low recovery rate, membrane pollution, etc., to avoid pollution Effect

Inactive Publication Date: 2016-04-13
EAST CHINA ENG SCI & TECH +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reclaimed water reuse treatment device has the characteristics of organic pollutants in the influent and high hardness and alkalinity in the water. Generally, only one-stage reverse osmosis membrane is used for recovery, and the recovery rate is generally not high, between 70-75%.
In some projects, in order to improve the water recovery rate, the concentrated water of the first-stage reverse osmosis is directly entered into the concentrated water reverse osmosis for re-concentration. After the organic pollutants and hardness are concentrated by the first-stage reverse osmosis, it is easy to cause Membrane fouling and membrane scaling make it difficult for concentrated water reverse osmosis devices to operate stably for a long time
[0004] Reclaimed water reuse treatment devices generally only add bactericide before ultrafiltration or before the filter. As a result, microorganisms are easily generated in the front-end regulating tank, resulting in poor effect of adding bactericide before filtration or before ultrafiltration , resulting in fouling of ultrafiltration and primary reverse osmosis membrane systems, making it difficult for the system to operate stably for a long time

Method used

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  • Method for reconcentrating and recycling reverse osmosis concentrated brine in reclaimed water recycling device

Examples

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Embodiment 1

[0026] The effluent and clean water from the sewage treatment station are combined into the regulating tank, and the water quality and quantity are adjusted in the regulating tank. At the same time, fungicides, such as chlorine dioxide or sodium hypochlorite, are added to the regulating tank at a dosage of 10-15 mg / L, and the effluent of the regulating tank is monitored. The residual chlorine reaches 1-2mg / L; the effluent from the regulating tank flows into the clarification tank, and according to the hardness of the water, caustic soda and soda ash are added to the water after calculation to remove most of the hardness in the water, and the sludge produced in the clarification tank is sent to the sludge dewatering center for further processing Dehydration, the press filtrate returns to the regulating tank;

[0027] The effluent from the clarification tank enters the filter to remove most of the suspended solids and particulate matter. The backwash drainage of the filter is col...

Embodiment 2

[0032] A method for reconcentrating and reusing reverse osmosis concentrated brine in a reclaimed water recycling device, comprising the following steps:

[0033] (1) The effluent and clean sewage from the sewage treatment station are merged into the regulating pool, and the water quality and quantity are adjusted in the regulating pond. At the same time, fungicides are added to the regulating pond at a dosage of 10-15mg / L, and the residual chlorine in the effluent of the monitoring and regulating pond reaches 1 ~2mg / L;

[0034] (2) The effluent of the regulating tank flows into the clarification tank. According to the hardness of the water, caustic soda and soda ash are added to the water after calculation, and most of the hardness in the water is formed by chemical reaction. The hardness of the effluent of the clarification tank is: 50-80 mg in terms of calcium carbonate / L, the sludge produced in the clarifier is sent to the sludge dewatering center for dehydration, and the...

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Abstract

The invention discloses a method for reconcentrating and recycling reverse osmosis concentrated brine in a reclaimed water recycling device. A multimedia filter+ultrafiltration is used for pretreatment to remove suspended substances and particles in the concentrated brine; sodium bed ion exchange is adopted to remove most concentrated hardness and ensure no scaling in the subsequent reverse osmosis; a bactericide is added into a regulating tank, before the filter and into the reverse osmosis concentrated water collecting tank and the like to avoid the microbial pollution in the membrane system; and the recovery rate is properly lowered, and the single-section membrane arrangement is adopted, thereby ensuring the stable operation of the system.

Description

technical field [0001] The invention belongs to the technical field of reclaimed water reuse, in particular to a method for reconcentrating and reusing reverse osmosis concentrated brine in a reclaimed water reuse device. Background technique [0002] The reclaimed water reuse device uses the discharge water up to the standard of the sewage treatment station and clean sewage (mainly the sewage from the circulating water station and the sewage from the desalinated water station) as water sources for treatment, and the product water is reused. [0003] The reclaimed water reuse treatment device has the characteristics of organic pollutants in the influent and high hardness and alkalinity in the water. Generally, only the first-stage reverse osmosis membrane is used for recovery, and the recovery rate is generally not high, between 70-75%. In some projects, in order to improve the water recovery rate, the concentrated water of the first-stage reverse osmosis is directly entered...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/42C02F1/441C02F1/444C02F1/50C02F1/5236C02F1/5245C02F9/00C02F2301/08
Inventor 黄开东李强薛宇
Owner EAST CHINA ENG SCI & TECH
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