Electrochemical enhanced sand filter tank arsenic removal method

A sand filter tank, electrochemical technology, applied in the field of arsenic-contaminated groundwater remediation, can solve the problems of automatic generation and removal, reduce the risk of secondary pollution, facilitate replacement, and enhance the effect of adsorption capacity

Active Publication Date: 2014-09-10
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method only provides a method for oxidation of trivalent arsenic, the oxidation method is different from the method in this application, and this method cannot automatically generate adsorbent to remove arsenic (V) from water

Method used

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  • Electrochemical enhanced sand filter tank arsenic removal method
  • Electrochemical enhanced sand filter tank arsenic removal method
  • Electrochemical enhanced sand filter tank arsenic removal method

Examples

Experimental program
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Embodiment 1

[0030] Embodiment 1: The present invention provides a method for removing arsenic by simulating an electrochemically enhanced sand filter tank in a laboratory. First, a small vertical electrochemically enhanced sand filter tank device is constructed in the laboratory. Its structure is as follows figure 1 As shown, the sand filter tank 1 is made into a cylinder with an inner diameter of 5 cm and a height of 32 cm. The sand filter tank 1 is provided with a water inlet 2 and a purified water outlet 7. The inner wall of the sand filter tank 1 is equipped with negative and positive electrodes. The remaining space is filled with quartz sand filter material 6, and sampling holes P1 to P6 are set in the wall of the sand filter tank 1, so as to sample and detect the concentration of arsenic (III) and arsenic (V) in the water at 6 water levels in the sand filter tank; Set DC power supply 8, rheostat 9, ammeter I 10, ammeter II 11 and replace water pump 12 with a peristaltic pump outside ...

Embodiment 2

[0039] Embodiment 2: The present invention provides a method for removing arsenic from electrochemically enhanced sand filter tanks. This method needs to build an electrochemically enhanced arsenic removal device from sand filter tanks. The device in this embodiment is suitable for home use. Its structure is as follows: Figure 5 As shown, the device includes a sand filter tank 1 with an inner diameter of 30 cm and a height of 100 cm. The sand filter tank 1 is provided with a water inlet 2 and a purified water outlet 7. The inner wall of the sand filter tank 1 is equipped with electrodes, and the remaining space in the sand filter tank 1 is Fill the quartz sand filter material 6 with a particle size of 0.5-1 cm, the total volume of the sand filter tank 1 and the void volume (PV) between the quartz sand are 70L and 35L respectively, and the porosity is 0.5. Set DC power supply 8, rheostat 9, ammeter 10, ammeter 11 and water pump 12 outside the sand filter tank 1; then operate as...

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Abstract

The invention relates to an electrochemical enhanced sand filter tank arsenic removal method. According to the electrochemical enhanced sand filter tank arsenic removal method, a set of arsenic removal device is adopted, an electrochemical technology is combined with a traditional sand filter tank arsenic removal technology, that is to say, iron oxide continuously produced by an electrode in the electrochemical technology is utilized for improving arsenic adsorption capacity of a sand filter tank, regular back washing is carried out when an arsenic removal device is used, the arsenic removal device can be reused after being subjected to back washing, and arsenic (III) in underground water is oxidized into arsenic (V) for a long time and the arsenic (V) is adsorbed and removed. The electrochemical enhanced sand filter tank arsenic removal method solves the problems that a traditional sand filter tank is long in service life, and sand filter materials are difficult to replace; no foreign oxidizing agent is added, and the electrochemical enhanced sand filter tank arsenic removal method has the characteristics of short treatment time, high efficiency, flexible operation, convenience in control, simple maintenance and environmental friendliness and is convenient for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of arsenic-contaminated groundwater restoration. Specifically, it relates to an electrochemically enhanced method for removing arsenic from a sand filter tank. Background technique [0002] Arsenic contamination of groundwater is a common problem faced by the whole world, and it is threatening at least 22 countries and regions, among which Bangladesh, India and China are the most serious. Iron oxides have excellent adsorption properties for arsenic, so they are widely used as adsorbents for arsenic removal. Household sand filter tank is a common groundwater arsenic removal technology, usually using professionally supplied quartz sand coated with iron oxide as filler, when the pumped out arsenic-containing groundwater flows through the quartz sand coated with iron oxide When filling the tank body, the arsenic in the water is adsorbed on the iron oxide and removed from the water during the contact process wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/28
Inventor 袁松虎童曼
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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