Method for treating acid waste water containing arsenic

A treatment method and wastewater technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of secondary pollution, low cost, unstable sedimentation, etc. less pollution, good stability, and easy access to raw materials

Active Publication Date: 2015-05-13
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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Problems solved by technology

In the prior art, the calcium salt precipitation method and the sulfide precipitation method are mainly used to remove arsenic, but the precipitate produced by it is unstable and will cause secondary pollution
[0003] CN102974317A discloses a method for treating arsenic-containing nonferrous heavy metal wastewater with an adsorbent prepared by ionic liquid; CN103409625A discloses the use of TiO 2 The method for treating arsenic-containing wastewater with prepared adsorbent materials; CN103551121A discloses that the adsorbent materials prepared from waste straws are used to treat arsenic-containing wastewater, and the effect is remarkable, but these adsorbent materials or desorption concentrated liquid treatment have not yet been reported
CN101254974A has reported the method for treating arsenic-containing wastewater by utilizing the centipede grass artificial wetland, which has low cost and high efficiency, but the treatment area is large and the arsenic concentration is required to be very low. is also a problem
However, this method is carried out at a relatively high temperature of 80°C, and weakly crystalline ferric arsenate begins to be produced when the pH value of the solution is 1.2, which is not conducive to the formation of crystalline scorodite, so the pH value needs to be controlled in this method Below 1.2, after 16 days, the removal rate of arsenic in wastewater can only reach about 80%. The cycle is long, and the treatment effect is not very high, which cannot meet the current higher requirements for the treatment of arsenic-containing wastewater, and this method only shows The treatment effect for wastewater with arsenic concentration of 1g / L is stated, but the treatment effect for wastewater with lower or higher concentration of arsenic is not stated

Method used

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  • Method for treating acid waste water containing arsenic
  • Method for treating acid waste water containing arsenic
  • Method for treating acid waste water containing arsenic

Examples

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Embodiment 1

[0033] Embodiment 1 Treatment of arsenic filter cake waste residue hot acid leaching solution produced in copper concentrate smelting process

[0034] After oxidizing the leaching solution, the ions and their contents in the leaching solution: As(Ⅴ) 10.08g / L, Cu 2+ 5.07g / L, the anion is mainly SO 4 2- , the pH of the solution is about 2.19.

[0035] In this embodiment, the treatment of the above-mentioned arsenic-containing wastewater is carried out by the following method, which specifically includes the following steps (the treatment process is as follows: figure 1 shown):

[0036] (1) Add MgSO to 100 mL of the above-mentioned arsenic-containing wastewater diluted to an As(V) concentration of 3 g / L 4 , KCl, Ca(NO 3 ) 2 , (NH 4 ) 2 SO 4 and K 2 HPO 4 Make into Leathern medium, add 0.02g yeast extract powder, then add 1.668g FeSO 4 x7H 2 O, completely dissolved, so that the molar ratio of iron to arsenic in the solution is 1.5:1, add 2.0g of seed FeAsO 4 ·2H 2 O...

Embodiment 2

[0041] Example 2 Treatment of the bioleaching solution of arsenic-containing gold concentrate

[0042] After oxidizing the leaching solution, the ions and their contents in the leaching solution: As(Ⅴ) 2.21g / L, Fe 3+ 4.26g / L, the anion is mainly SO 4 2- , the pH of the solution is about 1.6.

[0043] In this embodiment, the treatment of the above-mentioned arsenic-containing wastewater is carried out by the following method, which specifically includes the following steps (the treatment process is as follows: figure 1 shown):

[0044] (1) Remove Fe to 100 mL 3+ Add MgSO to the above-mentioned arsenic-containing wastewater 4 , KCl, Ca(NO 3 ) 2 , (NH 4 ) 2 SO 4 and K 2 HPO 4 Prepare 9K medium, add 0.02g yeast extract powder, then add 2.46g FeSO 4 x7H 2 O, completely dissolved, so that the molar ratio of iron to arsenic in the solution is 3:1, and 1.0g of seed FeAsO is added 4 ·2H 2 O, and inoculated with acid-resistant and arsenic-resistant acclimated Thiobacillu...

Embodiment 3

[0048] Example 3 Treatment of Waste Liquid from Zinc Refinery

[0049] Various ions and their contents in the waste liquid of zinc refinery: As 21.35g / L, Zn 1.55g / L, Cu 3.64g / L, Pb 3.72g / L, etc., pH is about 1.0.

[0050] In this embodiment, the treatment of the above-mentioned arsenic-containing wastewater is carried out by the following method, which specifically includes the following steps (the treatment process is as follows: figure 1 shown):

[0051] (1) MgSO was added to 100 mL of the above-mentioned arsenic-containing wastewater that had removed Pb and Cu ions and was diluted to contain As(V) of 3 g / L. 4 , KCl, Ca(NO 3 ) 2 , (NH 4 ) 2 SO 4 and K 2 HPO 4 Make up into Leathern medium, then add 2.23g FeSO 4 x7H 2 O, completely dissolved, so that the molar ratio of iron to arsenic in the solution is 2:1, and 1.0g of seed FeAsO is added. 4 ·2H 2 O, and inoculated with acid-resistant and arsenic-resistant acidophilic Thiobacillus ferrooxidans, and adjusted the pH...

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Abstract

The invention discloses a method for treating acid waste water containing arsenic. The method comprises the following steps of (1) adding essential elements for growing of iron-oxidizing bacterium to waste water containing arsenic to obtain a culture medium, adding ferrite, adding seed crystal after the ferrite is totally dissolved, inoculating the iron-oxidizing bacterium, and adjusting the PH value to 1.2-3.0; (2) moving mixed liquid obtained in step (1) into a reactor, reacting for 5-10 days under normal pressure at a temperature below 55 DEG C, and depositing arsenic in the waste water in a scorodite state so as to finish the treatment of the acid waste water containing arsenic. According to the method disclosed by the invention, the waste water containing arsenic with the concentration of 0.1-5g/L can be treated, the removal rate of arsenic in the waste water can reach more than 97% within short treatment time, besides, the raw material used in the method is easy to get, the condition is mild, the operation is simple, the synthesized scorodite is a crystal particle, and is easy to separate, high in arsenic content, and good in stability, and secondary pollution is not caused.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and relates to a method for treating arsenic-containing wastewater, in particular to a method for treating acidic arsenic-containing wastewater. Background technique [0002] With the continuous development of my country's non-ferrous metal smelting industry, arsenic-containing waste residues are increasing, resulting in frequent arsenic pollution incidents. Today, arsenic pollution has become the most difficult problem that my country's non-ferrous metal smelting industry must face. In the prior art, the calcium salt precipitation method and the sulfide precipitation method are mainly used to remove arsenic, but the resulting precipitation is unstable and will bring about secondary pollution. [0003] CN102974317A discloses a method for treating arsenic-containing non-ferrous heavy metal wastewater by using adsorbent prepared by ionic liquid; CN103409625A discloses using TiO 2 A method for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/10
CPCC02F3/346C02F2101/103
Inventor 杜娟张广积李媛媛杨超
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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