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Method for treating wastewater containing trivalent arsenic by utilizing microorganisms

A technology for microbial treatment and treatment of wastewater, applied in biological water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of increasing difficulty in operation, long reaction time, and increasing treatment costs, and achieves the same The effect of less pollution, simple operation and lower treatment cost

Active Publication Date: 2017-05-24
CENT SOUTH UNIV
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Problems solved by technology

[0005] The Chinese invention patent application with the publication number CN104609573A discloses a treatment method for acidic arsenic-containing wastewater. By adding essential elements for configuring the culture medium of iron-oxidizing bacteria in the wastewater, adding ferrous salts at the same time, inoculating iron-oxidizing bacteria, and adjusting the pH to 1.2-3.0, react at 55°C for 5-10 days, and pentavalent arsenic will be precipitated in the form of scorodite. However, in fact, if the arsenic contained in the wastewater is trivalent, it needs to be used before adopting this method. Oxidation of trivalent arsenic such as hydrogen peroxide increases the processing cost on the one hand, and increases the difficulty of operation on the other hand; in addition, the reaction time required by this method is longer, and the reaction needs to be completed at a higher temperature

Method used

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  • Method for treating wastewater containing trivalent arsenic by utilizing microorganisms
  • Method for treating wastewater containing trivalent arsenic by utilizing microorganisms
  • Method for treating wastewater containing trivalent arsenic by utilizing microorganisms

Examples

Experimental program
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Embodiment 1

[0033] This embodiment compares different bacteria to process containing As 3+ The impact of wastewater, the specific process is as follows: 3+ Add 44.7g / L FeSO to the wastewater to be treated with a concentration of 2.88g / L (calculated as arsenic) 4 ·7H 2 After O, inoculate acidophilic Thiobacillus ferrooxidans, Leptospira ferrousoxidans, thermostable Sulfobacillus oxidans and thermophilic ferrooxidans in logarithmic phase of growth respectively, the inoculum volume is V 菌 :V 废水 =1:10, the concentration is 2.4-5.2×10 7 Units / mL is calculated, under the conditions of temperature 30°C, pH=2.0, stirring speed 160-180r / min, after normal pressure reaction for 5 days, the solution is left to stand, the precipitate is filtered, and the filtrate is recovered to complete the treatment of arsenic-containing wastewater.

[0034] figure 1 For different bacterial pairs containing As 3+ The XRD pattern of the precipitate obtained from the wastewater to be treated with a concentration...

Embodiment 2

[0037] This example compares the thermotolerant oxidative sulfur bacteria to the treatment containing different As 3+ Concentration of wastewater, the specific process is as follows: in the As-containing 3+ Concentrations of 1.44g / L, 2.02g / L, 2.88g / L, 3.56g / L, 4.04g / L, 5.19g / L, 6.68g / L, 7.57g / L (calculated as arsenic) to be treated Add 44.7g / L FeSO to wastewater 4 ·7H 2 After O, inoculate thermotolerant Sulfur oxidans in the logarithmic phase of growth, and the inoculum volume is V 菌 :V 废水 =1:10, the concentration is 2.4-5.2×10 7 Units / mL calculation, under the conditions of temperature 30°C, pH=2.0, and stirring speed 160-180r / min, after 1-5 days of normal pressure reaction, the solution was left to stand, the precipitate was filtered, and the filtrate was recovered to complete the arsenic-containing wastewater. processing.

[0038] figure 2 As 3+ Concentrations of 1.44g / L, 2.02g / L, 2.88g / L, 3.56g / L, 4.04g / L, 5.19g / L, 6.68g / L, 7.57g / L (calculated as arsenic) to be tr...

Embodiment 3

[0048] This embodiment compares different pH values ​​to the temperature-resistant sulfur oxidative bacteria treatment concentration is 4.04g / L (calculated as arsenic) containing As 3+ The impact of wastewater, the specific process is as follows: 3+ Add 44.7g / L FeSO to the wastewater to be treated with a concentration of 4.04g / L (calculated as arsenic) 4 ·7H 2 After O, inoculate a volume in logarithmic phase of growth of 10% V 废水 , the concentration is 2.4-5.2×10 7 Each / mL thermostable Sulfobacillus oxidans, when the temperature is 30°C and the stirring speed is 160-180r / min, the pH is adjusted to 1.6, 1.8, 2.0, 2.2, 2.5 and 2.8 respectively, and after 1-5 days of normal pressure reaction, The solution is left to stand, the precipitate is filtered, and the filtrate is recovered to complete the treatment of the arsenic-containing wastewater.

[0049] Figure 4 As 3+ The XRD patterns of the precipitates obtained from the treated wastewater with a concentration of 4.04g / L (...

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Abstract

The invention discloses a method for treating wastewater containing trivalent arsenic by utilizing microorganisms. The method comprises the following steps: adding ferrous salt into wastewater to be treated which contains the trivalent arsenic; meanwhile, adding iron-oxidizing bacteria which stays at a growth logarithmic period; adjusting the pH (Potential of Hydrogen) to be 1.6 to 2.8; controlling the temperature to be 25 DEG C to 30 DEG C; uniformly stirring and reacting for 3d to 5d; standing and precipitating the trivalent arsenic in a form of tooeleite; filtering and finishing treatment. A microorganism oxidization method disclosed by the invention can be used for treating the arsenic-containing wastewater with the arsenic content of 3.56g / L to 7.57g / L and adjusting the pH to be 1.6 to 2.8; at room temprature of 25 DEG C to 30 DEG C, the removal rate of the trivalent arsenic within 3d to 4d can reach about 98 percent; the method has the advantages that the raw materials are easy to obtain, the operation is simple and the treatment cost is low; obtained sediment is easy to separate and the arsenic content is high; the stability is good and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for treating wastewater containing trivalent arsenic, in particular to a method for using microorganisms to treat wastewater containing trivalent arsenic. 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 nonferrous metal smelting industry must face. [0003] In the prior art, arsenic-containing wastewater is mainly treated by lime neutralization method, iron salt precipitation method and sulfide precipitation method. These methods are suitable for treating high-concentration arsenic-containing wastewater, but it is difficult to achieve the depth of arsenic due to the limitation of solubility product. At the same tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/5245C02F1/66C02F3/34C02F9/00C02F2001/5218C02F2101/103
Inventor 李青竹柴立元张梦雪王庆伟闵小波杨志辉王海鹰
Owner CENT SOUTH UNIV
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