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High-concentration arsenious acid wastewater treatment method and device

A technology for the treatment of arsenic-containing acid and waste water, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve simple treatment processes and devices, resource utilization, and low operating costs Effect

Active Publication Date: 2013-08-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is to use a two-step vulcanization method to remove arsenic for the arsenic in high-concentration arsenic-containing wastewater, especially the strongly acidic high-concentration arsenic-containing wastewater in the acid production project. The raw water first passes through the packed bed loaded with FeS , and then pump Na into the raw water with sufficient stirring 2 S is further reacted. Using the method and device, the arsenic removal rate is high, the removal effect is stable, no secondary pollution occurs, and the resource regeneration of arsenic can be realized.

Method used

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  • High-concentration arsenious acid wastewater treatment method and device

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Embodiment 1

[0034] A method for treating high-concentration arsenic-containing acidic wastewater, comprising the steps of:

[0035] (1) Stable blending: the arsenic content in the raw water is 5000mg / L, and the arsenic form in the water is mainly trivalent arsenic. The acidity of the wastewater is 2mol / L in terms of sulfuric acid concentration. There is no need to adjust the acidity, and it is directly pumped into the blending device through the pipeline, fully Mix and stabilize for 20 minutes.

[0036] (2) Ferrous sulfide treatment: the wastewater treated by the deployment device is pumped into the ferrous sulfide reaction device, the wastewater fully contacts with the ferrous sulfide in the packed bed from bottom to top, and the treatment takes 10 minutes to reduce the arsenic content in the wastewater to 450mg / L, acidity decreased to 0.1mol / L in terms of sulfuric acid concentration.

[0037] (3) Sodium sulfide treatment: the waste water processed through the packed bed enters into th...

Embodiment 2

[0041] A method for treating high-concentration arsenic-containing acidic wastewater, comprising the steps of:

[0042] (1) Stable blending: the arsenic content in the raw water is 3000 mg / L, and the arsenic form in the water is mainly pentavalent arsenic. The acidity of the wastewater is 1mol / L in terms of sulfuric acid concentration. There is no need to adjust the acidity, and it is directly pumped into the blending device through the pipeline, fully Mix and stabilize for 20 minutes.

[0043] (2) Ferrous sulfide treatment: the wastewater treated by the deployment device is pumped into the ferrous sulfide reaction device, and the wastewater fully contacts with the ferrous sulfide in the packed bed from bottom to top, and is treated for 20 minutes to reduce the arsenic content in the wastewater to 500mg / L, acidity decreased to 0.05mol / L in terms of sulfuric acid concentration.

[0044] (3) Sodium sulfide treatment: the waste water processed through the packed bed enters into...

Embodiment 3

[0048] In this embodiment, the arsenic content in the raw water is 3000 mg / L and the arsenic form in the water is mainly trivalent arsenic, and the acidity of the wastewater is 0.5 mol / L in terms of sulfuric acid concentration.

[0049] In this example, the acidity of the waste water is further reduced, but the form of arsenic in the waste water is trivalent arsenic, and the waste water can be treated in the same way as in Example 2, and the removal effect can also be stabilized at a residual arsenic concentration of 10 mg / L.

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Abstract

The invention discloses a high concentration arsenious acid wastewater treatment method and device, and belongs to the technical field of heavy metal industrial wastewater treatment. The wastewater treatment method comprises the following steps of: adopting two-step sulfidation method to remove arsenic, mixing and stabilizing the raw water, then feeding the raw water into a packed bed loading with FeS, pumping Na2S solution into the raw water under a sufficient stirring condition, and finally, separating solid deposition from purified water. The wastewater treatment device consists of a mixing device, a ferrous sulfide reaction device, a sodium sulfide reaction device and a flat sheet membrane solid-liquid separation device. The treatment method and the device are simple, practicable, convenient to operate and low in cost, and the retention time and Na2S addition amount of the FeS packed bed can be controlled according to different arsenous contents and arsenous states of the wastewater, so that the wastewater with different arsenous contents can be treated, the arsenous content of the wastewater can be reduced to 2-20mg / L from 500-10000mg / L, the treated arsenous has stable state and property, secondary pollution is avoided, and permanent standard emission is realized.

Description

technical field [0001] The invention relates to a method and a device for treating high-concentration arsenic-containing acidic wastewater under different water quality conditions by using sulfide, iron salt and the like. It belongs to the technical field of heavy metal industrial wastewater treatment, Background technique [0002] Arsenic is a highly toxic and carcinogenic substance. In nature, arsenic mostly exists in various metal minerals. Therefore, high-concentration arsenic-containing wastewater is often produced in the production process of mineral smelting and chemical industries. Especially in the production of acid from sulfur concentrate, the arsenic-containing wastewater produced has the characteristics of strong acidity, high arsenic content and complex water quality. , it is difficult to process efficiently and stably and is prone to secondary pollution. [0003] At present, the lime neutralization precipitation method is mostly used in industry to treat suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 曲久辉杨中超刘锐平朱利军胡承志武利园
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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