Waste water treatment method and device based on forward osmosis and membrane distillation

A waste water treatment and forward osmosis technology, applied in the direction of osmosis/dialysis water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve single, complex, unsolvable problems such as membrane fouling, and achieve cost reduction Effect

Inactive Publication Date: 2013-05-01
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the membrane fouling problem in the membrane distillation process is a bottleneck affecting the application of membrane distillation
The pollution of the membrane distillation process includes the presence of organic matter, microorganisms, and some easy-to-structure salts in the solution, which lead to a decrease in the hydrophobicity of the membrane, and even membrane wetting and thus operation failure.
Membrane fouling therefore results in a greatly reduced applicability of the membrane distillation process
If the feed liquid with definite components, relatively simple composition, and less fouling and membrane fouling will improve the operation stability of membrane distillation, but the actual water quality should be very complicated, so directly using membrane distillation to generate a lot of waste water is beneficial. Unable to solve membrane fouling problem

Method used

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  • Waste water treatment method and device based on forward osmosis and membrane distillation
  • Waste water treatment method and device based on forward osmosis and membrane distillation
  • Waste water treatment method and device based on forward osmosis and membrane distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1: Treatment of shale gas fracturing wastewater by FO-MD coupling process

[0074] The indicators of shale gas fracturing wastewater are shown in Table 1:

[0075] Table 1: Indicators of shale gas fracturing wastewater

[0076]

[0077] The process of coupling forward osmosis and membrane distillation is adopted, and the process flow chart is shown in figure 1 , the forward osmosis drive solution uses 2.55M MgCl 2 Solution, FO membrane adopts CTA flat membrane, adopts AL-DS mode; membrane distillation adopts direct contact membrane distillation (DCMD) process, MD membrane adopts CF 4 The hydrophobized PES hollow fiber membrane has a water contact angle of more than 170° on the membrane surface, and the diluted draw liquid MgCl at the outlet of the forward osmosis module 2 The concentration is 2.4M. After membrane distillation treatment, the concentration of regeneration drive solution reaches 2.55M, and the operating temperature of membrane distillation i...

Embodiment 2

[0081] Example 2: Treatment of Glyphosate Industrial Wastewater by FO-MD Coupling Process

[0082] Glyphosate wastewater influent water quality indicators are shown in Table 2:

[0083] Table 2: Influent water quality indicators after wastewater pretreatment

[0084] project

indicators

Remark

Glyphosate(g / L)

8.5

After preprocessing

TOC (g / L)

15.4

After preprocessing

NaCl(g / L)

122

After preprocessing

Na 2 HPO 3 (g / L)

15

After preprocessing

pH

9.5

After preprocessing

[0085] The forward osmosis-membrane distillation coupling process is used to treat glyphosate wastewater. The forward osmosis membrane is a surface-treated forward osmosis membrane material made of polysulfone material (PSF). Mode; membrane distillation adopts vacuum membrane distillation (VMD) process, the process flow chart is shown in figure 2 , the vacuum degree is 0.3-0.4bar, and the membrane module int...

Embodiment 3

[0089] Embodiment 3: FO-MD coupling process treats silver nitrate wastewater

[0090] The petrochemical industry uses precious metal compounds as catalysts, and recycling the precious metals of spent catalysts is an effective means to reduce costs. The silver catalyst is dissolved in nitric acid and then directly evaporated and concentrated by steam, which not only consumes a lot of steam, but also silver nitrate is extremely unstable, and its decomposition is intensified at high temperature, which requires high equipment. In order to reduce costs, FO-MD coupling process is used for processing.

[0091] The main indicators of silver nitrate wastewater are: silver nitrate content: 3-3.5%; excess nitric acid content: 1-2%, a small amount of other impurities.

[0092]In the experiment, the silver nitrate wastewater was filtered and then concentrated using the FO-VMD process. The process flow chart is shown in figure 2 . FO adopts FO membrane elements produced by HTI Company, t...

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Abstract

The invention belongs to the field of sewage treatment, and particularly relates to a waste water treatment method and device based on forward osmosis and membrane distillation. The waste water treatment method based on the forward osmosis and membrane distillation comprises a waste water concentration process and a drive liquid circulation process, wherein the waste water concentration process adopts a forward osmosis technology to concentrate waste water with high salt content and high chemical oxide demand (COD) concentration through drive liquid so as to obtain the concentrated waste water and diluted drive liquid; the drive liquid circulation process adopts a membrane distillation technology to dehydrate the diluted drive liquid so as to obtain the purified water and renewable drive liquid; and the renewable drive liquid is repeatedly used for the waste water concentration process so as to continuously concentrate the waste water. Due to the adoption of the method and device for treating the waste water with high salt content and high COD concentration, the waste water of different sources and fields can be treated, and the advantages such as wide applicability for waste water, stability in running and low treatment cost can be realized.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a wastewater treatment method and device based on forward osmosis and membrane distillation. Background technique [0002] At present, high-salt wastewater is a kind of wastewater that is difficult to effectively treat and discharge in industrial production. The main representative wastewater includes shale gas fracturing wastewater, glyphosate industrial wastewater, silver nitrate wastewater, titanium dioxide wastewater, and copper sulfate industrial wastewater. , pharmaceutical wastewater, printing and dyeing wastewater, oil field wastewater, etc. These wastewater not only have high salt content, but also often contain high chemical oxygen demand COD, and have very low biodegradability. For the treatment of wastewater with high salt content and high COD concentration, there is no cost-effective treatment technology method with a wide range of application. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10B01D61/58C02F1/08C02F1/44
Inventor 何涛赵宝龙李雪梅王周为宋健峰李刚陈刚肖佩佩曾楚怡殷勇李春霞孔丁峰朱黎澜
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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