Method for treating reverse osmosis concentrated water

A reverse osmosis concentrated water and treatment method technology, applied in the field of reverse osmosis concentrated water treatment, can solve problems affecting the application of reverse osmosis technology, organic matter content reduction, salt reduction, etc.

Inactive Publication Date: 2012-04-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The use of reverse osmosis technology to treat and reuse biochemical standard wastewater is an important technical means for enterprises to achieve water saving and emission reduction. However, reverse osmosis concentrated water cannot be discharged up to standard, which affects the application of reverse osmosis technology in the field of wastewater reuse.
[0004] At present, some treatment methods have been developed for reverse osmosis concentrated water. The concentrated water is further concentrated. Some reverse osmosis concentrated water is filtered and treated by reverse osmosis; Concentrated water is treated with reverse osmosis, these methods still have concentrated water discharge, facing the problem of not being able to meet the standard
There is also the removal of organic matter. After the reverse osmosis concentrated water is filtered, it is treated with ozone oxidation technology, and the content of organic matter in the concentrated water is effectively reduced. Although the organic matter meets the standard, there is no reduction in salt, and there is no reduction in salt discharge. Restricted areas still cannot meet emission standards, and the treatment cost is relatively high

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] The effluent of a refinery’s production wastewater after secondary biochemical treatment is further treated and reused by adding alkali to remove hardness-ultrafiltration-reverse osmosis process. The pH of the reverse osmosis concentrated water is 8.3, the COD is 190mg / L, and the conductivity It is 4600μm / cm, and the total hardness is 213mg / L (as CaCO 3 count).

[0024] The above-mentioned concentrated water is treated by a nanofiltration system. The operating conditions of the nanofiltration system are as follows: the nanofiltration membrane is selected as Dow FILMEC TM NF270-400. The operating conditions are: the pressure is 0.6MPa, the pH is adjusted to 6.8, and the temperature is 20°C. Under these operating conditions, the recovery rate of the control membrane is 70%, and the permeation flux of the membrane is 19L / m 2 h.

[0025] After nanofiltration membrane treatment, the concentrated solution has a COD of 532mg / L, a conductivity of 11600μm / cm, and a total har...

Embodiment 2

[0028] The discharge water from a refinery’s production wastewater after the secondary biochemical treatment is advanced treated and reused by the multi-media filtration-ultrafiltration-reverse osmosis process. The pH of the reverse osmosis concentrated water is 7.6, the COD is 155mg / L, and the conductivity is 3700μm / cm, total hardness 426mg / L (as CaCO 3 count).

[0029] The above-mentioned concentrated water is treated by a nanofiltration system. The operating conditions of the nanofiltration system are as follows: the nanofiltration membrane is selected as Dow FILMEC TM NF200-400. The operating conditions are: the pressure is 0.5MPa, the pH is adjusted to 7.0, and the temperature is 20°C. Under this operating condition, the recovery rate of the control membrane is 70%, and the permeation flux of the membrane is 20L / m 2 h.

[0030] After nanofiltration membrane treatment, the concentrated solution has a COD of 463mg / L, a conductivity of 10300μm / cm, and a total hardness of...

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Abstract

The invention discloses an up-to-standard treatment method for concentrated water obtained after up-to-standard biochemical sewage is treated by a pretreatment and reverse osmosis system. The concentrated water obtained after the up-to-standard biochemical sewage is treated by the reverse osmosis system enters a selective nanofiltration membrane system through a high-pressure pump; after the concentrated water is treated by a nanofiltration membrane, when the total hardness of a concentrated solution is more than 1,000mg / L (based on CaCO3), the concentrated solution is needed to be subjected to hardness removal and refluxed to a biochemical tank of a sewage treatment factory, or refluxed to an anaerobic reaction tank if the anaerobic reaction tank is provided; when the total hardness of the concentrated solution is less than 1,000mg / L (based on CaCO3), the concentrated solution can be directly refluxed to the biochemical tank of the sewage treatment factory, or refluxed to the anaerobic reaction tank if the anaerobic reaction tank is provided; and produced water can be directly discharged after reaching the standard and can be recycled to a target unit according to the requirement. The method is simple, convenient and effective, salt and organic matters are reduced to a certain extent, and the aim of up-to-standard discharge, water conservation and emission reduction are fulfilled.

Description

technical field [0001] The invention relates to a treatment method for reverse osmosis concentrated water, in particular to a standard-reaching treatment method for reverse osmosis concentrated water discharged after reusing biochemical standard sewage. Background technique [0002] "Energy saving and emission reduction" has become an important and urgent task of my country's current economic and social development, and water saving is the most important, and has been included in the important indicators of enterprise development by various large water-consuming enterprises. [0003] Using reverse osmosis technology to treat and reuse biochemical standard wastewater is an important technical means for enterprises to save water and reduce emissions. However, reverse osmosis concentrated water cannot be discharged up to standard, which affects the application of reverse osmosis technology in the field of wastewater reuse. [0004] At present, some treatment methods have been d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 赵辉刘正
Owner CHINA PETROLEUM & CHEM CORP
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