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A method for enhanced adsorption of fluoride and sulfate in groundwater and recovery of ammonium sulfate

A technology of fluoride and sulfate, applied in chemical instruments and methods, ammonium sulfate, adsorption water/sewage treatment, etc., can solve unsuitable problems, achieve safe use, obvious environmental and economic benefits, and process flow simple effect

Inactive Publication Date: 2016-04-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this method is not suitable for treating drinking water with low organic matter content.

Method used

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  • A method for enhanced adsorption of fluoride and sulfate in groundwater and recovery of ammonium sulfate
  • A method for enhanced adsorption of fluoride and sulfate in groundwater and recovery of ammonium sulfate

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Experimental program
Comparison scheme
Effect test

Embodiment approach 2

[0036] The modified activated alumina is prepared with a lanthanum-magnesium molar ratio of 1:2, a calcination temperature of 400°C, and a calcination time of 3 hours.

[0037]Modified activated alumina adsorption column: operate at a water temperature of 15-25°C, the influent pH value is 6-8; the operating flow rate is 8m / h, the concentration of ammonia water regeneration solution is 10%, the regeneration flow rate is 8m / h, forward and backwash The flow rate is 20m / h, and the forward and backwash time is 20min.

Embodiment approach 3

[0039] The modified activated alumina is prepared with a lanthanum-magnesium molar ratio of 1:2, a calcination temperature of 500°C, and a calcination time of 4 hours.

[0040] Modified activated alumina adsorption column: operate at a water temperature of 15-25°C, the pH of the influent is 6-8; the operating flow rate is 12m / h, the concentration of the ammonia regeneration solution is 10%, the regeneration flow rate is 8m / h, forward and backwash The flow rate is 15m / h, and the forward and backwash time is 30min.

Embodiment approach 4

[0042] The modified activated alumina is prepared with a lanthanum-magnesium molar ratio of 1:1, a calcination temperature of 300°C, and a calcination time of 3 hours.

[0043] Modified activated alumina adsorption column: operate at a water temperature of 15-25°C, the pH of the influent is 6-8; the operating flow rate is 12m / h, the concentration of ammonia regeneration solution is 20%, the regeneration flow rate is 6m / h, forward and backwash The flow rate is 15m / h, and the forward and backwash time is 30min.

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Abstract

The invention discloses a method for enhancing the adsorption of fluoride and sulfate in groundwater and recovering ammonium sulfate, which belongs to the technical field of environmental protection and water supply treatment. It is characterized in that it uses rare earth metal lanthanum and non-ferrous metal magnesium to do metal doping modification on activated alumina to realize enhanced adsorption of fluoride and sulfate in groundwater. This method is used to treat high concentration fluoride and high concentration sulfuric acid Salt groundwater, the modified activated alumina after adsorption treatment is regenerated with ammonia water, and the ammonium sulfate of the regeneration waste liquid is evaporated and concentrated to recover ammonium sulfate. Compared with traditional water treatment methods, this method can Efficient removal at the same time fluoride and sulfate in water and Recyclable Ammonium Sulfate , the water quality after treatment can meet the requirements for fluoride and sulfate in the "Drinking Water Sanitation Standard" (GB5749-2006), without secondary pollution, and the pollutants can be recovered, which has obvious environmental and economic benefits. New pathways for groundwater containing high levels of fluoride and high sulfate.

Description

technical field [0001] The invention discloses a method for enhancing the adsorption of fluoride and sulfate in groundwater and recovering ammonium sulfate, which belongs to the technical field of environmental protection and water supply treatment. Specifically, the rare earth metal lanthanum and non-ferrous metal magnesium are used to dope and modify activated alumina to enhance the adsorption and removal of fluoride and sulfate in groundwater, and the modified activated alumina after adsorption treatment is regenerated with ammonia water. The waste liquid is ammonium sulfate solution, and ammonium sulfate can be recovered after concentration. Background technique [0002] Natural fluorine usually exists in ores, and it will be dissolved when it is eroded by rainwater, causing fluorine pollution in groundwater. In addition, aluminum and iron production, electroplating, mineral processing, fertilization, etc. will all bring fluorine pollution to water bodies. Fluoride ent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/58C01C1/24B01J20/08B01J20/30B01J20/34
CPCB01J20/0207B01J20/04B01J20/08B01J20/3475C01C1/24C02F1/281C02F2101/101C02F2101/14C02F2103/06
Inventor 李红艳李尚明张峰韩晓峰梦庆兰
Owner TAIYUAN UNIV OF TECH
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