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A positive penetration treatment method of energy -saving high -salt waste water

A technology of high-salt wastewater and treatment method, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of increased wastewater treatment cost, high reverse osmosis volume, and high concentration cost It can solve the problem of high regeneration cost, improve the removal rate, and achieve the effect of easy separation.

Active Publication Date: 2019-03-12
江苏东南环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used forward osmosis draw solution has a high concentration cost and a high reverse osmosis amount, resulting in an increase in wastewater treatment costs and low efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A forward osmosis treatment method for energy-saving high-salt wastewater, comprising the following steps:

[0030] 1. Preparation of sodium citrate magnetic nanoparticles forward osmosis draw solution

[0031] (a) Dissolve ferric chloride and ferrous chloride in 100ml distilled water respectively, then add dropwise to sodium hydroxide solution, under the protection of inert gas, stir at 2000 rpm for 30min, then heat to 70°C , continuously stirred for 2 hours, naturally cooled to room temperature, and then centrifuged at 7000 rpm for 20 minutes, and the obtained precipitate was washed to neutrality, and dried under vacuum conditions to obtain ferroferric oxide magnetic nanoparticles;

[0032] (b) Add sodium citrate solution to the ferroferric oxide magnetic nanoparticles prepared in step (a), heat to 80°C and stir vigorously for 2h, then centrifuge at 5000rpm for 20min, wash the obtained precipitate and centrifuge again, and repeat 2-5 times, and finally dry the precip...

Embodiment 2

[0039] A forward osmosis treatment method for energy-saving high-salt wastewater, comprising the following steps:

[0040] 1. Preparation of sodium citrate magnetic nanoparticles forward osmosis draw solution

[0041] (a) Dissolve ferric chloride and ferrous chloride in 100ml of distilled water respectively, then add dropwise to the sodium hydroxide solution, under the protection of inert gas, stir at 3000 rpm for 30min, then heat to 90°C , continuously stirred for 2 hours, naturally cooled to room temperature, and then centrifuged at 5000 rpm for 20 minutes, the obtained precipitate was washed to neutrality, and dried under vacuum conditions to obtain ferroferric oxide magnetic nanoparticles;

[0042] (b) Add sodium citrate solution to the ferroferric oxide magnetic nanoparticles prepared in step (a), heat to 100° C. and stir vigorously for 1 h, then centrifuge at 8000 rpm for 10 min, and then centrifuge again after washing the precipitate obtained, and repeat 2-5 times, and...

Embodiment 3

[0049] A forward osmosis treatment method for energy-saving high-salt wastewater, comprising the following steps:

[0050] 1. Preparation of sodium citrate magnetic nanoparticles forward osmosis draw solution

[0051] (a) Dissolve ferric chloride and ferrous chloride in 100ml of distilled water respectively, then add dropwise to sodium hydroxide solution, under the protection of inert gas, stir at 2500 rpm for 40min, then heat to 75°C , continuously stirred for 5 hours, naturally cooled to room temperature, and then centrifuged at 5500 rpm for 15 minutes, the obtained precipitate was washed to neutrality, and dried under vacuum conditions to obtain ferroferric oxide magnetic nanoparticles;

[0052] (b) Add sodium citrate solution to the ferroferric oxide magnetic nanoparticles prepared in step (a), heat to 85°C and stir vigorously for 4.8h, then centrifuge at 6000rpm for 15min, and centrifuge again after the obtained precipitate is washed, so Repeat 2-5 times, and finally dry...

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Abstract

The invention discloses an energy-saving high salinity wastewater forward osmosis treatment method. The method comprises the following steps: firstly adding a flocculating agent to wastewater, standing for precipitation, carrying out crystallization in an electromagnetic crystallizing reactor after filtration, then carrying out forward osmosis treatment on supernatant after filtration, and finally concentrating and recycling a diluted draw solution. The forward osmosis treatment method has the beneficial effects that a mixture of sodium citrate magnetic nanoparticles and distilled water is adopted as a forward osmosis membrane draw solution; and the wastewater treatment method can be used for effectively removing pollutants in high salinity wastewater, is high in water recovery rate and draw solution reuse rate, is simple and practicable to operate and is low in cost.

Description

Technical field: [0001] The invention relates to the field of wastewater treatment, in particular to an energy-saving forward osmosis treatment method for high-salt wastewater. Background technique: [0002] Since the reform and opening up, my country's economy has developed rapidly, and the level of industrial and agricultural production and urbanization has been continuously improved. However, the problem of water pollution is also becoming more and more serious. Sewage can be divided into domestic sewage and industrial sewage according to the source. The domestic sewage is collected by the municipal drainage pipe network and enters the municipal sewage plant, and is discharged into the natural water body after being treated up to the standard. Industrial sewage includes waste liquid produced in the production process of chemical industry, papermaking, printing and dyeing, food, textile and other industries, which contains a large amount of production raw materials, prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/12
CPCC02F1/001C02F1/441C02F1/445C02F1/487C02F1/56C02F9/00C02F2001/5218
Inventor 陈永林
Owner 江苏东南环保科技有限公司
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