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Method for adsorbing fluorides and sulfates in underground water in enhanced manner and recycling ammonium sulfate

A technology of fluoride and sulfate, applied in the direction of chemical instruments and methods, ammonium sulfate, adsorption water/sewage treatment, etc., can solve unsuitable problems, achieve safe use, simple process flow, and ensure water quality safety

Inactive Publication Date: 2015-03-25
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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  • Method for adsorbing fluorides and sulfates in underground water in enhanced manner and recycling ammonium sulfate
  • Method for adsorbing fluorides and sulfates in underground water in enhanced manner and recycling ammonium sulfate

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Experimental program
Comparison scheme
Effect test

Embodiment approach 2

[0036]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] 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] 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 adsorbing fluorides and sulfates in underground water in an enhanced manner and recycling ammonium sulfate, belonging to the technical fields of environmental protection and feed water treatment. The method is characterized by comprising the following steps: performing metal-doped modification on active aluminum oxide by use of rear earth metal lanthanum and non-ferrous metal magnesium to realize the purpose of adsorbing fluorides and sulfates in underground water in the enhanced manner. The method is used for treating underground water containing high-concentration fluorides and high-concentration sulfates, regenerating the modified active aluminum oxide subjected to the adsorption treatment by ammonia water, and recycling ammonium sulfate after evaporating and concentrating regenerated waste liquor ammonium sulfate. Compared with the conventional feed water treatment method, the method can be used for efficiently removing adsorbing fluorides and sulfates in water and recycling ammonium sulfate, is capable of enabling the treated water to reach the requirements on fluorides and sulfates according to the 'hygienic standard for drinking water (GB5749-2006)', is free of secondary pollution, is capable of recycling pollutants, has obvious environmental benefits and economic benefits, and is a novel way for treating the underground water containing high-concentration fluorides and high-concentration sulfates.

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. Fluorid...

Claims

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Application Information

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Patent Type & Authority Applications(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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