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Arsenic polluted water body repairing method and apparatus

A water body remediation and arsenic pollution technology, applied in the field of remediation of arsenic-contaminated water bodies, can solve the problems of increased governance difficulty, large investment, no removal and purification of arsenic-contaminated water bodies, etc., achieving good environmental benefits, low investment and operating costs, The effect of easy maintenance

Inactive Publication Date: 2007-03-28
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods not only require a large investment, but also produce insoluble arsenic-containing substances, which will inevitably bring in other ions. In addition to reasons such as exchange capacity and treatment costs, when the arsenic concentration is reduced to a certain level, the difficulty of treatment will increase (Huang et al., "Environment Science & Technology", Volume 38, 2004, pages 3412-3417)
So far, there have been no studies and reports on the use of phytoremediation technology to remove and purify arsenic-polluted water bodies

Method used

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  • Arsenic polluted water body repairing method and apparatus
  • Arsenic polluted water body repairing method and apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The arsenic-contaminated water body to be treated (the arsenic concentration is 52 μg / L) enters the water storage tank 1 through the water inlet 3, and the chopped centipede grass feather leaves (length is 1 cm, water: centipede grass=500:1, V / W) are put Put into the middle of the two-layer screen cloth 6 and 7 of pinna holding device, plastic screen cloth and pinnae are all immersed in water then, stir constantly with stirring device 5. Take water samples at 0, 1, 4, 8, 12, 24 and 48 hours to analyze its arsenic concentration, and after 48 hours, slide the A end of the pinna holding device 2 to the D end, and take out the pinnae from the screen Centralized treatment, the treated water is output from the water outlet 4 to the storage tank 1 . As can be seen from Figure 1, between 0-12 hours, the concentration of arsenic in the water decreases with the prolongation of the soaking time of the feather leaves, and reaches the lowest concentration of arsenic in the water at ...

Embodiment 2

[0034] The main operation process is basically the same as that in Example 1, but the arsenic concentration in the water body to be repaired is 530 μg / L. The chopped centipede grass pinnae were immersed in the water body to be treated (water: centipede grass=500:1, V / W), and water samples were taken at 0, 1, 4, 8, 12, 24 and 48 hours to analyze its arsenic concentration, the pinnae were removed from the water body after 48 hours. It can be seen from Figure 2 that the concentration of arsenic in the water decreases with the prolongation of the soaking time of the feather leaves between 0 and 24 hours, and the concentration of arsenic in the water reaches the lowest level at 24 hours, which is 440 μg / L. If the amount of centipede grass pinnata was increased, its arsenic removal efficiency could be further improved. After remediation with centipede grass feather leaves, the arsenic concentration in the polluted water was reduced to below the arsenic concentration (500μg / L, GB 89...

Embodiment 3

[0036] The main operation process is basically the same as in Example 1, but the arsenic concentration in the water body to be repaired is 5000 μg / L (the highest level of arsenic concentration in ordinary industrial sewage). The centipede grass feather leaves were immersed in water with arsenic concentration of 5000 μg / L (water: centipede grass=500:1, V / W), and water samples were taken at different times to analyze the arsenic concentration. It can be seen from Figure 3 that the concentration of arsenic in the water decreases with the extension of the soaking time of the feather leaves between 0 and 12 hours, and the concentration of arsenic in the water reaches the lowest level at 12 hours, which is 4500 μg / L. The removal efficiency of arsenic in the whole process can reach up to 10%.

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Abstract

The invention relates to an As polluted water body plant repairing method and device, using supravital leaves of Pteris vittata L to largely absorb As from the polluted water body to achieve the purpose of reducing the As content in the water body and purifying water. And the device is composed mainly of water storage tank and Pteris vittata L leatherleaf holding device, where the water storage tank has water inlet and outlet, the bottom of the water storage tank is equipped with blender, Pteris vittata L leatherleaves are placed between two plastic screen layers, and the screens are fixed on the leatherleaf holding device. And it has advantages of less investment, low maintaining cost, small engineering quantity, low energy consumption, easy to maintain, etc. And it is a polluted water body 'green repairing technique' with wide application range and good effect, able to be used to repair various As polluted water bodies and control pollution, and the repaired water bodies can meet the requirements of national related water quality standard.

Description

technical field [0001] The invention relates to a method and a device for repairing arsenic-polluted water bodies. Specifically, it is a method for repairing arsenic-polluted water bodies by using a special plant material—a super-accumulator plant centipede grass (Pteris vittata L.)—and an associated device. Background technique [0002] Arsenic is one of the environmental pollutants that the World Health Organization attaches great importance to. Even long-term low-dose exposure will cause harm to human health (Smith et al., "Science", 2002, Vol. 296, pp. 2145-2146). At present, the standard for arsenic concentration in drinking water stipulated by the World Health Organization (WHO) and my country is no more than 50 μg / L (GB 5749-85), but the standard for arsenic concentration in drinking water in the United States will be reduced to 10 μg / L. The natural weathering of arsenic-containing rocks, mining activities, and the discharge of arsenic-containing "three wastes" will ...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F101/10
Inventor 陈同斌阎秀兰陈阳黄泽春雷梅廖晓勇
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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