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Arsenic-containing waste water treatment method and apparatus

A treatment method and wastewater technology, applied in the field of water pollution control, can solve the problems of secondary pollution, high cost, low efficiency, etc., and achieve the effects of reducing agglomeration, reducing toxicity, and speeding up the reaction rate

Pending Publication Date: 2018-07-06
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a treatment method and device for arsenic-containing wastewater, which fully combines the characteristics and requirements of the arsenic-containing wastewater treatment method, and specifically conducts arsenic-containing wastewater treatment process and device Redesign, and select and arrange the key parameters and key device components in the process of the treatment method, correspondingly obtain a low-cost, high-efficiency arsenic-containing wastewater treatment method, thus solving the problems of the existing technology Technical problems such as low efficiency, high cost, secondary pollution and difficulty in mineralizing heavy metals in arsenic wastewater treatment methods

Method used

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  • Arsenic-containing waste water treatment method and apparatus
  • Arsenic-containing waste water treatment method and apparatus

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preparation example Construction

[0055] Among them, the microwave catalyst is a microwave-absorbing material loaded with zero-valent iron, and the relative dielectric constant of the microwave-absorbing material is not less than 4, such as silicon carbide, activated carbon, biochar, ferrite, graphite, carbon black, iron minerals, etc. or manganese minerals. The function of the absorbing material in the present invention is to improve the absorbing performance of the zero-valent iron. When adopting different wave-absorbing substances and loading zero-valent iron as the microwave catalyst of the present invention, the specific loading and preparation methods are different. The method is prepared, and the silicon carbide is in the shape of a tube, a rod or a plate. Iron sheet is used as anode, silicon carbide is used as cathode, ferrous salt is used as electrolyte, and the silicon carbide microwave catalyst loaded with zero-valent iron is obtained after a constant current of 0.5-2A and energized for 10-40 minut...

Embodiment 1

[0079] A kind of arsenic wastewater treatment device, such as figure 1 As shown, it includes a wastewater oxidation treatment section and a sludge solidification treatment section, wherein: the wastewater oxidation treatment section includes a grid pool 1, a swirling grit chamber 2, a regulating pool 3, a microwave reaction pool 4 and a secondary sedimentation pool 5.

[0080] The grid pool 1 includes a grid pool inlet 11 and a grid pool outlet 12; the grid pool 1 is used for preliminary filtration treatment of arsenic-containing wastewater, and the arsenic-containing wastewater enters the grid pool 1 from the grid pool inlet 11 and is filtered. After that, it flows out from the grid pool outlet 12.

[0081] The swirl grit chamber 2 includes the swirl grit chamber inlet 21 and the swirl grit chamber outlet 22, the grid cell outlet 12 communicates with the swirl grit chamber inlet 21, and the swirl grit chamber 2 is used to remove arsenic Sand particles in wastewater.

[0082] ...

Embodiment 2

[0095] The treatment of arsenic-containing wastewater using the arsenic-containing wastewater treatment device described in Example 1 comprises the following steps:

[0096] (1) Preparation of microwave catalyst: After SiC was cleaned 3 times with deionized water, it was placed in 1% HCl solution for 30 minutes, then it was taken out and cleaned 3 times with deionized water, and placed in an electric blast drying oven at 105 Dry at ℃ for 8 hours, take out, cool to room temperature, and set aside. Then 11.12gFeSO 4 ·7H 2 O was dissolved in 200 mL deionized water, and a little H was added 2 SO 4 prevent Fe 2+ Oxidized, prepare 0.20mol / L FeSO 4 The solution is an electrolyte. Electrodeposition was carried out with a DC stabilized power supply, the pretreated SiC was used as the cathode, the bright iron sheet was used as the anode, the constant current was 1.00A, and Fe / SiC was obtained after 20 minutes of electrification.

[0097] (2) Oxidation and precipitation of wastewa...

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Abstract

The invention belongs to the technical field of water pollution treatment, and particularly relates to an arsenic-containing waste water treatment method and apparatus. The method comprises the following steps: performing the microwave catalytic oxidation precipitation treatment on arsenic-containing waste water with a pH value less than or equal to 10 under the catalytic effect of a microwave catalyst in an oxygen-containing atmosphere, and converting trivalent arsenic to pentavalent arsenic, co-precipitating the pentavalent arsenic and trivalent iron, thus obtaining the arsenic-containing waste water after the microwave treatment and iron arsenate-containing sludge, wherein the microwave catalyst is a wave absorption substance loading zero-valent iron, and a relative dielectric constantof the wave absorption substance is not less than 4. The arsenic-containing waste water after the microwave treatment can be discharged up to standard, a sludge stabilizer is added into the sludge, and the pH of the sludge is adjusted, so that the sludge is stabilized and reaches a bury standard. The method is an arsenic-containing waste water treatment method with low cost and high efficiency, and solves the technical problems in the arsenic-containing waste water treatment method in the prior art that the efficiency is low, the cost is high, secondary pollution is caused and heavy metal is difficult to mineralize and the like.

Description

technical field [0001] The invention belongs to the related technical field of water pollution control, and more specifically relates to a treatment method and device for arsenic-containing wastewater. Background technique [0002] With the rapid development of industry, the problem of arsenic (As) pollution in water has become more and more serious, which has brought great harm to the ecological environment and human health, and has become a common concern. Arsenic ranks first among the "heavy metals and their compounds" in the "China Environmental Priority Pollutants Blacklist". Arsenic-containing compounds can cause serious harm to animals, plants and humans. The discharge of industrial "three wastes" is the main source of arsenic in water. The "three wastes" in mining, smelting, electroplating, chemical and other industries are directly or indirectly discharged into the environment without any treatment, causing arsenic pollution in water bodies. China is one of the co...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/74C02F1/30C02F11/00C02F11/06C02F9/08C02F101/10
CPCC02F1/302C02F1/725C02F1/74C02F9/00C02F11/00C02F11/008C02F11/06C02F2303/06C02F2301/08C02F2001/007C02F2101/103C02F1/385C02F1/66C02F1/001C02F1/24
Inventor 陈静李鸿博王琳玲石瑶潘红魏乐成庹雄柳铭富杨眉
Owner HUAZHONG UNIV OF SCI & TECH
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