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Recycling method of high brine waste water based on forward osmosis

A treatment method and high-salt technology, applied in the field of membrane separation, can solve the problems of reduced applicability, singleness and complexity of the membrane distillation process

Inactive Publication Date: 2013-09-18
何涛 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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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  • Recycling method of high brine waste water based on forward osmosis
  • Recycling method of high brine waste water based on forward osmosis
  • Recycling method of high brine waste water based on forward osmosis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Treatment of shale gas fracturing wastewater by FO-MD coupling process

[0053] Indicators of shale gas fracturing wastewater after pretreatment:

[0054] Analysis Project

unit

indicators

Alkalinity

mg / l as CaCO 3 count

210

Cl -

mg / l

56720

SO 4 2-

mg / l

28

Na +

mg / l

29130

K +

mg / l

1263

Ca 2+

mg / l

7830

Mg 2+

mg / l

412

Ba 2+

mg / l

11.3

Sr 2+

mg / l

1182

total hardness

mg / l as CaCO 3 count

46210

TDS

mg / l

152312

[0055] The process of coupling forward osmosis and membrane distillation is adopted, and the process flow is shown in the schematic diagram 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 DCMD process, MD membrane adopts CF 4 Hydrophobic tre...

Embodiment 2

[0057] Example 2: Treatment of Glyphosate Industrial Wastewater by FO-MD Coupling Process

[0058] Influent water quality indicators after pretreatment are:

[0059] project

indicators

Remark

Glyphosate(g / L)

8.5

After preprocessing

TOC (g / L)

15.4

After preprocessing

NaCl(g / L)

122

After preprocessing

[0060] Na 2 HPO 3 (g / L)

15

After preprocessing

pH

9.5

After preprocessing

[0061] The forward osmosis-membrane distillation coupling process is used to treat glyphosate wastewater, and the forward osmosis process of glyphosate wastewater is shown in the diagram figure 1 , the process flow of membrane distillation is shown in the schematic diagram figure 2 , the forward osmosis membrane is made of polysulfone material (PSF) surface-treated forward osmosis membrane material, the drive fluid is 23% sodium chloride aqueous solution, and the AL-DS operation mode is ado...

Embodiment 3

[0063] Example 3: FO-MD coupling process for treating silver nitrate wastewater

[0064] 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.

[0065] The main indicators of silver nitrate wastewater after pretreatment are: silver nitrate content: 3-3.5%; excess nitric acid content: 1-2%, a small amount of other impurities.

[0066] In the experiment, silver nitrate wastewater was filtered and concentrated by FO-MD coupling process. The FO adopts the FO membrane element produced by HTI Company, the driving fluid adopts 1....

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Abstract

The invention discloses a recycling method of high brine waste water based on forward osmosis. The method comprises the following steps: firstly, concentrating high brine waste pretreated through a forward osmosis membrane element, wherein water in waste water enters into a driving liquid from a raw material side of a forward osmosis membrane; and then, concentrating, dehydrating and regenerating the diluted driving liquid obtained through one or more of a membrane distillation membrane element, a membrane distillation evaporation assembly or a low temperature multi-effect evaporation assembly, wherein regenerated driving liquid is recycled in the process of returning to forward osmosis. The method is widely applicable for the type of waste water, and has the advantages of long-term stable operation and low treatment cost.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a treatment method and process for high-salt wastewater based on forward osmosis technology. 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...

Claims

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Application Information

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IPC IPC(8): C02F9/10B01D61/58
Inventor 何涛赵宝龙李雪梅王周为殷勇
Owner 何涛
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