Ammonium fluoride wastewater treatment technique

A technology for wastewater treatment and ammonium fluoride, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, osmotic/dialysis water/sewage treatment, etc., can solve the problems of slow reaction speed and low treatment cost, Achieve the effects of reduced adsorption, high water flux, and increased width

Inactive Publication Date: 2012-09-12
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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  • Ammonium fluoride wastewater treatment technique

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Embodiment 1

[0035] will be 2m 3 / d. After the wastewater with a concentration of 0.2% ammonium fluoride is collected by the raw water tank, adjust the pH value to 6. The ammonium fluoride wastewater with stable physical and chemical properties is sent to the ultrafiltration system for removal of suspended solids. The membrane modules of the ultrafiltration system use hollow fiber membranes, and the material of the ultrafiltration membrane is polypropylene; When the concentration reaches 8mg / L, it enters the nanofiltration system for concentration and desalination. The membrane module of the nanofiltration system adopts a coiled membrane module, and the material of the nanofiltration membrane is polyamide; when the pH value is 6 and the concentration of the concentrated solution is 2%, it enters the electrodialysis system after being concentrated and desalted by the first-level nanofiltration. In the electrodialysis system, after treatment, part of the wastewater is desalinated and part o...

Embodiment 2

[0037] will be 3m 3 / d. After the ammonium fluoride wastewater with a concentration of 12% is collected by the raw water tank, the pH value is adjusted to 9, and the ammonium fluoride wastewater with stable physical and chemical properties is sent to the ultrafiltration system for removal of suspended solids. The membrane module of the ultrafiltration system adopts hollow fiber membranes, and the material of the ultrafiltration membrane is polyvinylidene fluoride. When the concentration of suspended solids in the ammonium fluoride wastewater is treated to 3mg / L, it enters the electrodialysis system for concentration and desalination. Treatment is carried out in an electrodialysis system. After treatment, part of the wastewater is desalinated and part of the wastewater is concentrated. When the ammonium fluoride concentration of the desalinated wastewater is 0.3%, it enters the nanofiltration system with good anti-pollution performance and high rejection rate for further desali...

Embodiment 3

[0039] will be 4m 3 / d. After the ammonium fluoride wastewater with a concentration of 3% is collected by the raw water tank, the pH value is adjusted to 7, and the ammonium fluoride wastewater with stable physical and chemical properties is sent to the ultrafiltration system for removal of suspended solids. The membrane module of the ultrafiltration system adopts hollow fiber membranes, and the material of the ultrafiltration membrane is polyethersulfone; when the concentration of suspended solids in the ammonium fluoride wastewater is treated to 5mg / L, it enters the electrodialysis system for concentration and desalination. Treatment is carried out in an electrodialysis system. After treatment, part of the wastewater is desalinated and part of the wastewater is concentrated. When the concentration of ammonium fluoride in the desalinated wastewater is 0.2%, it enters the nanofiltration system with good anti-pollution performance and high rejection rate for further desalinatio...

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Abstract

The invention relates to an ammonium fluoride wastewater treatment technique which comprises the following steps: ammonium fluoride wastewater pretreatment, ultrafiltration treatment, electrodialysis treatment, and nanofiltration treatment until the ammonium fluoride content of the ammonium fluoride solution subjected to nanofiltration treatment is less than 5 mg/L, thereby completing the ammonium fluoride wastewater treatment. The invention has the following advantages: 1. reasonable technique combination: the ultrafiltration technique is adopted, the wastewater is treated by internal circulation between the electrodialysis system and the nanofiltration system according to the concentration of ammonium fluoride, and the electrodialysis technique desalts and concentrates inorganic salts in the wastewater, and has high permeation speed and desalting performance; 2. the investment and operating cost is lowered; and 3. ammonium salts in the wastewater are treated in good time, thereby changing wastes into valuable substances and implementing zero discharge to the outside.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to an ammonium fluoride wastewater treatment process. Background technique [0002] With the rapid development of my country's industry, the production of ammonium fluoride wastewater has more and more serious impact on the environment. The large discharge of ammonia nitrogen and fluoride ions in ammonium fluoride wastewater will cause great harm to the environment. At present, there have been several relatively large hazardous incidents. When the concentration of ammonia nitrogen in the water body is too high, it will lead to rich oxidation of the water body, the deterioration of water resources, and at the same time, it will also have a certain impact on human health. The massive discharge of fluoride ions will also lead to changes in soil structure, which will cause great harm to drinking water, crops and underground buildings. [0003] Ammonium fluoride w...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/469C02F1/44
Inventor 楼永通李嘉
Owner HANGZHOU BLUETEC ENVIRONMENTAL TECH
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