Resource utilization method of acid wastewater

A technology for recycling acidic wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of no use value and low acid concentration, and achieve low treatment costs Effect

Inactive Publication Date: 2013-04-03
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, the concentration of acid in acidic wastewater is too low to be useful, and it is impossible to concentrate the dilute acid within a controllable cost range to realize the resource utilization of waste acid in wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add sodium hydroxide solution to wastewater with sulfuric acid content of 0.9% and nitric acid content of 0.6% to make the pH of the wastewater = 6.5. After cooling the wastewater to 20°C, add PAM (polyacrylamide) flocculant to the wastewater. According to the addition of 0.5% in the waste water, after precipitation, the suspended solids in the waste water are removed by ultrafiltration through a fiber ball filter and two precision filters with a filter aperture of 5 μm, and then the waste water is treated with 2m 3 The flow rate of / h enters the electrodialysis treatment device. The salt content (including sodium sulfate and sodium nitrate) in the concentrated water after electrodialysis treatment is 10.8%, and the power consumption for treating 1 ton of wastewater is 4.0kwh. Then the waste water with a salt content of 10.8% was treated with 0.1m according to the method of patent number 201010570625.3. 3The flow rate of / h enters the multi-effect membrane distillation ...

Embodiment 2

[0044] Add potassium hydroxide solution to wastewater with a sulfuric acid content of 0.9% and a nitric acid content of 0.6% to make the pH of the wastewater = 6.4. After cooling the wastewater to 30°C, add PAM (polyacrylamide) flocculant to the wastewater. According to the addition of 0.5% in the waste water, after precipitation, the suspended solids in the waste water are removed by ultrafiltration through a fiber ball filter and two precision filters with a filter aperture of 5 μm, and then the waste water is treated with 2m 3 The flow rate of / h enters the electrodialysis treatment device. The salt content (including potassium sulfate and potassium nitrate) in the concentrated water after electrodialysis treatment is 10.1%, and the power consumption for treating 1 ton of wastewater is 4.1kwh. Then the waste water with a salt content of 10.1% was treated with 0.1m according to the method of Patent No. 201010570625.3. 3 The flow rate of / h enters the multi-effect membrane di...

Embodiment 3

[0047] Add sodium hydroxide solution to wastewater with sulfuric acid content of 0.9% and nitric acid content of 0.6% to make the pH of the wastewater = 6.0. After cooling the wastewater to 40°C, add PAM (polyacrylamide) flocculant to the wastewater. According to the addition of 0.5% in the waste water, after precipitation, the suspended solids in the waste water are removed by ultrafiltration through a fiber ball filter and two precision filters with a filter aperture of 5 μm, and then the waste water is treated with 2m 3 The flow rate of / h enters the electrodialysis treatment device. After the electrodialysis treatment, the salt content (including ammonium sulfate and ammonium nitrate) in the concentrated water is 10%, and the power consumption for treating 1 ton of wastewater is 3.8kwh. Then the waste water with a salt content of 10% was mixed with 0.1m according to the method of Patent No. 201010570625.3. 3 The flow rate of / h enters the multi-effect membrane distillation...

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Abstract

The invention discloses a resource utilization method of acid wastewater, which belongs to the technical field of comprehensive utilization of chemical engineering waste. The resource utilization method comprises the following steps of: adjusting the PH value of the acid wastewater to 4.5-7; b. adding a flocculating agent, and removing precipitates after settling; c. filtering the wastewater treated in the step b by a fiber ball filter and a precision filter so that the content of suspended matters is less than 1mg/L; d. carrying out electrodialysis to control the concentration of salts to be 101%; e. carrying out multiple-effect membrane distillation to control the concentration of salts to be 302%; and f. carrying out multiple-effect evaporation to control the concentration of salts to be 60-80%, and then crystallizing to obtain the product. The resource utilization method has the advantages that the resource utilization of the acid wastewater is realized, certain economic benefits are achieved, the treatment cost is low, and the technical problems that the cost of treating the acid wastewater by calcined lime or slaked lime is high, and generated waste residues are difficult to treat are solved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of chemical waste, and in particular relates to a resource utilization method of acidic waste water. Background technique [0002] In the chemical industry, there are a lot of acid wastewater discharges, which must be neutralized before they can be discharged. Since the price of lime is relatively cheap, quicklime or slaked lime is generally used for acid wastewater neutralization. Although the price of quicklime or slaked lime is relatively cheap, if the wastewater discharge volume is large and the acid content is high (such as greater than 1%), the amount of acid discharged through the waste acid is quite large, correspondingly, the consumption of quicklime during neutralization Or the amount of slaked lime is also quite large, and the cost of neutralization is also very high. And a large amount of CaSO is produced during the neutralization process 4 waste residue, while CaSO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 张仁旭阳洪赵利斌陈敏
Owner SICHUAN NITROCELLULOSE CORP
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