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Method for removing arsenic in water by means of nano hematite

A hematite and water removal technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of losing the ability to absorb arsenic, high concentration of iron ions in water, etc., and achieve high particle strength and water resistance properties, high acid and alkali resistance, and high stability

Active Publication Date: 2016-06-22
HEFEI UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

At present, zero-valent iron has been used to remove arsenic in groundwater permeable walls, but with the reaction of zero-valent iron and water, it gradually loses the ability to absorb arsenic through passivation, and there is still a problem of excessive iron ion concentration in water.

Method used

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  • Method for removing arsenic in water by means of nano hematite
  • Method for removing arsenic in water by means of nano hematite
  • Method for removing arsenic in water by means of nano hematite

Examples

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Embodiment 1

[0023] Now take the laboratory simulation test as an example, and the non-limiting embodiments are described as follows:

[0024] A limonite ore with a porous structure was chosen, with a goethite content of 82%, with open nano-micro voids. The limonite ore is crushed to obtain particles with a particle size of 0.5-1mm, and then calcined at 320°C for 10 minutes in an air atmosphere in a muffle furnace, and the goethite phase changes into hematite, from brown to red, and Goethite is further nanoscaled during the phase transition to form nanostructured porous material particles (e.g. figure 2 shown).

[0025] The calcined nanostructured porous granular material is used as a filter material and packed into a filter column with a diameter of 20 mm, and the packing height is 50 cm. Use a peristaltic pump to reduce the concentration of trivalent arsenic to C 0 = 1.0mg / L groundwater is transported to the filter column, and passes through the filter material according to the hydra...

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Abstract

The invention discloses a method for removing arsenic in water by means of nano hematite.The method is characterized by comprising the steps that limonite ore which is of a vesicular structure is utilized to serve as the raw material, breaking and calcining are conducted, and a nano-structured porous granular material with a hematite crystal structure is obtained; the granular material serves as a filter material to be filled into a filter column or a filter tank, arsenic-containing underground water is treated, and removal of arsenic can be achieved.According to the method for removing arsenic in the water by means of the nano hematite, the nano hematite is utilized to remove arsenic in the water, the content of arsenic ions in effluent can be smaller than 0.01 mg / L, the removal rate is stabilized to be 97% or above, and the water quality of the effluent meets the drinking water quality standard; the nano hematite serving as the filter material can be regenerated and reused, and the cost is significantly reduced.

Description

1. Technical field [0001] The invention belongs to the field of drinking water treatment, and in particular relates to a method for removing arsenic from underground water containing excessive arsenic. 2. Background technology [0002] Scientific studies have shown that arsenic is very harmful to human health and is one of the carcinogens that requires strict control of intake. Drinking water is an important intake source of arsenic. If it exceeds 0.01mg / L, it will bring risks to human health. Therefore, all countries in the world have revised the standards for drinking water. However, with the revision of the allowable concentration of arsenic in drinking water, about 30% of drinking water in the world that uses groundwater as raw water needs to be treated for arsenic removal. The content of arsenic in groundwater drinking water sources in my country's Inner Mongolia, Xinjiang, Shanxi, Taiwan and other places is as high as 0.2-2.0mg / L. In Qinghai, Gansu, Shaanxi, Henan, H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/72C02F1/28C02F103/06
CPCC02F1/281C02F1/58C02F1/725C02F2101/103C02F2103/06C02F2303/16
Inventor 周跃飞陈天虎刘海波张羽皮汇钰
Owner HEFEI UNIV OF TECH
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