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Treatment method of high salinity organic wastewater

A technology for organic wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. and other problems, to avoid secondary pollution and waste of resources, achieve good practical application value, and make full use of resources.

Inactive Publication Date: 2011-12-14
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve a good treatment effect by using traditional physical methods and physical and chemical methods. Not only is it easy to cause secondary pollution, but it also requires a large investment and high operating costs.
Using biological methods for treatment, high concentrations of salts will lead to an increase in osmotic pressure, causing the separation of microbial cell protoplasm, salting out will reduce the activity of metabolic enzymes, destroy the structure of microbial enzymes, inhibit the growth and enzymatic action of microorganisms, thereby reducing Effects of microorganisms on wastewater treatment
At the same time, high salinity will cause the activated sludge to float and lose, which will seriously affect the purification effect of the biological treatment process.
Therefore, before the biological treatment of high-salt organic wastewater, it is necessary to dilute the wastewater so that the mass fraction of salt is less than 1%, but this will cause waste of water resources, make the treatment facilities huge, increase investment, and increase operating costs
At present, although there are research reports on the treatment technology of wastewater with higher salt content, the operation performance is often not stable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] In this embodiment, the salts in the high salinity organic wastewater are mainly Na 2 SO 4 class, the wastewater SO 4 2- The content is about 212 000 mg / L, the COD content is about 14000 mg / L, and the COD / SO 4 2- <0.1, the pH value is about 10.3. Embodiment 1, its method steps are as follows:

[0010] 1) Adsorption of activated carbon: at room temperature, the pH of the high-salinity organic wastewater solution is controlled to 4.5, the dosage of activated carbon is 5 g per liter of wastewater, the reaction time is controlled at 60 min, and the stirring rate is controlled at 100 r / min. At this time, the COD removal rate can reach 45%~55%. After the adsorption reaction is completed, the effluent is subjected to the next treatment, and the activated carbon is recycled and reused;

[0011] 2) Fenton reaction: adjust the pH of the adsorbed water sample to 2.0, and then add 30% hydrogen peroxide to 10 mL / L per liter of wastewater, FeSO 4 ·7H 2 The additive of O is 4g...

Embodiment 2

[0013] Embodiment 2, its method steps are as follows:

[0014] 1) Adsorption of activated carbon: at room temperature, the pH of the high-salinity organic wastewater solution is controlled to 6, the dosage of activated carbon is 10 g per liter of wastewater, the reaction time is controlled at 90 min, and the stirring rate is controlled at 150 r / min. At this time, the COD removal rate can reach 45%~55%. After the adsorption reaction is completed, the effluent is subjected to the next treatment, and the activated carbon is recycled and reused;

[0015] 2) Fenton reaction: adjust the pH of the adsorbed water sample to 4, then add 30% hydrogen peroxide to 30mL / L per liter of wastewater, FeSO 4 ·7H 2 The additive of O is 6g / L per liter of wastewater, and the reaction time is controlled at 30 minutes. After a period of reaction, the COD removal rate is about 95%. After the above treatment, the COD content in the remaining water is about 350mg / L;

[0016] 3) Activated carbon desorp...

Embodiment 3

[0017] Embodiment 3, its method steps are as follows:

[0018] 1) Adsorption of activated carbon: at room temperature, the pH of the high-salinity organic wastewater solution is controlled to 8.0, the dosage of activated carbon is 20 g per liter of wastewater, the reaction time is controlled at 120 min, and the stirring rate is controlled at 300 r / min. At this time, the COD removal rate can reach 45%~55%. After the adsorption reaction is completed, the effluent is subjected to the next treatment, and the activated carbon is recycled and reused;

[0019] 2) Fenton reaction: adjust the pH of the adsorbed water sample to 5.0, and then add 30% hydrogen peroxide to 50 mL / L per liter of wastewater, FeSO 4 ·7H 2 The O additive is 4-8g / L per liter of wastewater, and the reaction time is controlled at 10-60 minutes. After a period of reaction, the COD removal rate is about 95%. After the above treatment, the COD content in the remaining water is about 350mg / L. ;

[0020] 3) Activate...

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Abstract

A treatment method for high-salinity organic wastewater, the method adopts the process of combining adsorption, Fenton reaction and adsorbent desorption regeneration reuse, adsorbs a part of organic matter in the wastewater by activated carbon, and then adds Fenton reagent to remove a part organic matter, and then add chemical agents to desorb and regenerate the adsorbent for reuse. After the aforementioned steps, the treated wastewater can be discharged to a general domestic sewage treatment plant for final treatment, and the activated carbon in the adsorption process can basically be recycled after being regenerated. The method of the invention has the advantages of simple process, good treatment effect, convenient maintenance, no secondary pollution and the like.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating high-salinity organic wastewater. Background technique [0002] Because high-salt organic wastewater contains not only high concentrations of organic matter, but also high concentrations of salts and total dissolved solids, it is currently one of the most difficult organic wastewaters to treat. It is difficult to achieve a good treatment effect by using traditional physical methods and physical and chemical methods. It is not only easy to cause secondary pollution, but also requires a large investment and high operating costs. Using biological methods for treatment, high concentrations of salts will lead to an increase in osmotic pressure, causing the separation of microbial cell protoplasm, salting out will reduce the activity of metabolic enzymes, destroy the structure of microbial enzymes, inhibit the growth and enzymatic action of microorganisms, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 杨春平何慧军罗胜联罗旭彪刘莉华陈雄易斌李小豹杨莉
Owner NANCHANG HANGKONG UNIVERSITY
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