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Treatment method of high-salt and high-COD wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve problems such as pollution and high energy consumption, and achieve reduced economic investment and low energy consumption , to ensure the effect of repeated use

Pending Publication Date: 2021-09-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the evaporation process, because the organic matter cannot be completely removed, there is a possibility of impurities in the evaporated crystallized salt. In addition, the energy consumption in the evaporation process is large, and the final incineration of the concentrated solution will also cause pollution.

Method used

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  • Treatment method of high-salt and high-COD wastewater
  • Treatment method of high-salt and high-COD wastewater
  • Treatment method of high-salt and high-COD wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0025] In the embodiment of the present invention, a method for treating high-salt and high-COD wastewater to recover acid and alkali, the wastewater is high-salt aniline-containing wastewater that has been pretreated with sulfuric acid to neutrality, wherein the concentration of sodium sulfate is about 3%, and the concentration of COD is about 1500ppm, the specific steps are as follows:

[0026] Resin adsorption: A-722MP is selected as the resin for removing organic matter in high-salt and high-COD wastewater. Add 100g resin to the adsorption column, control the speed of waste water flowing through the adsorption column at 5BV / h, and control the COD of the resin effluent within 50ppm. Samples were taken every 10 minutes to detect the COD content of the resin effluent. In 100 minutes, that is, when the effluent volume was 150BV, the COD content remained basically the same as that in the original solution, and the adsorption effect was not obvious. LS-109D is the resin choice ...

Embodiment 2

[0028] In the embodiment of the present invention, a method for treating high-salt and high-COD wastewater to recover acid and alkali, the wastewater is high-salt aniline-containing wastewater that has been pretreated with sulfuric acid to neutrality, wherein the concentration of sodium sulfate is about 3%, and the concentration of COD is about 1500ppm, the specific steps are as follows:

[0029]Resin adsorption: LS-109D is the resin choice for organic matter in high-salt and high-COD wastewater. Add 100g resin to the adsorption column, control the speed of waste water flowing through the adsorption column at 5BV / h, and control the COD of the resin effluent within 50ppm. Samples were taken every 10 minutes to detect the COD content of the resin effluent. In 100 minutes, the COD content was 48.19ppm when the effluent volume was 150BV, and the adsorption effect was obvious. Therefore, the adsorption time was controlled to be 100 min.

[0030] Preparation of acid and base by tw...

Embodiment 3

[0036] In the embodiment of the present invention, a method for treating high-salt and high-COD wastewater to recover acid and alkali, the wastewater is high-salt aniline-containing wastewater that has been pretreated with sulfuric acid to neutrality, wherein the concentration of sodium sulfate is about 3%, and the concentration of COD is about 1500ppm, the specific steps are as follows:

[0037] Resin adsorption: LS-109D is selected as the resin for removing organic matter in high-salt and high-COD wastewater. 100g of resin was added to the adsorption column, the speed of wastewater flowing through the adsorption column was controlled at 5BV / h, the adsorption time was 100min, and the COD content of the resin effluent was 48.19ppm.

[0038] Acid-base preparation by bipolar membrane electrodialysis: collect resin effluent and pass it into bipolar membrane electrodialysis device. The bipolar membrane electrodialysis device is the same as that in Example 1, which is composed of ...

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Abstract

The invention discloses a treatment method of high-salt and high-COD wastewater. Cation of salt in the wastewater is sodium ion; the treatment method is implemented according to the following steps: (1) adsorbing the high-salt and high-COD wastewater through resin to remove COD in the wastewater; (2) carrying out at least one stage of bipolar membrane electrodialysis treatment on the resin effluent to convert salt into acid and NaOH solution for recycling; (3) cleaning the fully adsorbed resin in the step (1) with pure water, then desorbing with a NaOH solution to obtain a desorbed solution, cleaning the desorbed resin with pure water until the cleaning solution is neutral, then reusing the resin for adsorption in the step (1), and combining the desorbed solution and the cleaning solution to obtain a mixed solution; (4) carrying out at least one-stage electrodialysis treatment on the mixed solution to recover the NaOH solution; controlling the concentration of the NaOH solution obtained in the step (2) and the concentration of the NaOH solution used for resin desorption in the step (3) to be not lower than the concentration of the NaOH solution used for resin desorption in the step (3), and using the NaOH solution obtained in the step (2) and the NaOH solution obtained in the step (4) directly for the step (3) or diluted for the step (3).

Description

technical field [0001] The invention relates to the field of water treatment technology and application technology, in particular to a treatment method for high-salt and high-COD wastewater. Background technique [0002] With the rapid development of industry, the production of high-salt and high-COD wastewater is increasing day by day. High-salt and high-COD wastewater refers to wastewater with a salt content of more than 1000ppm in the water body, and the COD content is >1000ppm. If high-salt wastewater is not discharged up to the standard, it will cause considerable harm to the ecological environment and human beings, directly cause damage to water bodies, and is also a waste of resources. The high concentration of COD in wastewater will mainly cause two hazards: one is that the reducing substances in the water body will be destroyed, breaking the ecological balance of the water body, causing the death of almost all organisms except microorganisms, and then affecting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/30
CPCC02F9/00C02F1/285C02F1/4693C02F2201/46115C02F2303/16C02F2101/308C02F1/66C02F2303/14
Inventor 沈江南吕雅月阮慧敏
Owner ZHEJIANG UNIV OF TECH
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