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Device and method for removing fluorine ions in groundwater

A groundwater and fluoride ion technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high cost and low fluoride removal efficiency, reduce the cost of fluoride removal, improve the efficiency of fluoride removal, The effect of reducing the risk of excessive aluminum ions

Active Publication Date: 2014-05-07
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to reduce the probability of excessive aluminum ions in this method, the pH needs to be controlled at about 7.6±0.2 during the defluorination process, and this pH value range is not the optimal pH range for powdered hydroxyapatite defluorination, resulting in Lower efficiency and higher cost

Method used

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  • Device and method for removing fluorine ions in groundwater
  • Device and method for removing fluorine ions in groundwater
  • Device and method for removing fluorine ions in groundwater

Examples

Experimental program
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Effect test

Embodiment 1

[0037] For equipment used to remove fluoride ions from groundwater, see Figure 1 to Figure 3 , including water inlet device 1, reaction device 2, ultrafiltration device 3 and aeration device 4, water inlet device 1 is arranged on reaction device 2, water inlet device 1 is provided with material dosing device, ultrafiltration device 3 is arranged on In the reaction device 2, the aeration device 4 is arranged at the bottom of the reaction device 2 and is aerated through the aeration holes 16 on the aeration device 4, and the ultrafiltration device 3 is provided with a water outlet pipe 5, and the water outlet pipe 5 is provided with a first water pump 6; the reaction device 2 is also provided with a hypochlorous acid dosing device 11; the reaction device 2 is also provided with a perforated deflector 15, and the ultrafiltration device 3 is located in the perforated deflector 15; There is a waste liquid discharge port 17, and the ultrafiltration membrane backwash water and waste...

Embodiment 2

[0044] Use the equipment used to remove fluoride ions in groundwater to remove fluoride, the steps are as follows:

[0045] (1) Use the material dosing device to add aluminum salt, powdered hydroxyapatite, and acid or lye for pH adjustment into the water inlet pipe, and pump groundwater into the water inlet pipe at the same time, driven by the groundwater Acid or lye, aluminum salt and powdered hydroxyapatite are mixed in a tube mixer to obtain a mixture and enter the reaction device;

[0046] (2) The mixture completes the defluorination reaction process in the reaction device, mainly due to the complexation reaction of aluminum salt and fluoride ions in groundwater in the reaction device and the adsorption of fluorine ions by powdered hydroxyapatite; The effect of mixing and stirring makes the reaction more rapid. At the same time, the number of aeration holes decreases from the inside to the outside to achieve different effects of aeration intensity at different positions, t...

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Abstract

The invention provides a device for removing fluorine ions in groundwater, which comprises water inlet devices (1), a reaction device (2), ultra-filtration devices (3) and aeration devices (4), wherein the water inlet devices (1) are arranged on the reaction device (2) and are provided with material feed devices; the ultra-filtration devices (3) are arranged in the reaction device (2); the aeration devices (4) are arranged at the bottom of the reaction device (2) and aerate by aeration holes (16) on the aeration devices (4); the ultra-filtration devices (3) are provided with outlet pipes (5); and first water pumps (6) are arranged on the outlet pipes (5). The invention further provides a method for removing fluorine by the device for removing fluorine ions. The device for removing fluorine ions in groundwater has the characteristics of simple structure, convenient use, low cost, good fluorine removing effect, and high effluent quality.

Description

technical field [0001] The invention belongs to the field of groundwater purification, in particular to a device for removing fluorine ions in groundwater, and also to a method for removing fluorine ions by using the device. Background technique [0002] The situation of groundwater pollution in China is complex. Except for Shanghai, groundwater pollution problems exist in all provinces across the country, involving nearly 100 million people. In particular, fluorosis caused by ingestion of fluoride in drinking water is a serious problem worldwide. [0003] Existing groundwater defluoridation technologies mainly include coagulation sedimentation, activated alumina adsorption, electrodialysis, reverse osmosis, ion exchange, adsorption, bone charcoal adsorption, and zeolite defluorination, etc. All there are certain problems in this kind of technology, so that there are certain difficulties in its popularization and application. CN200510013656.8 discloses an aluminum salt coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F101/14
Inventor 刘成陈卫胡伟汪晨倩
Owner HOHAI UNIV
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