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Method for treating arsenic waste solution of hazardous waste by using composite functional bacteria

A technology for compound functional bacteria and hazardous wastes, applied in the fields of arsenic compounds, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of expensive adsorbent, difficult regeneration, high cost, and achieve the effect of reducing the residual amount of arsenic

Active Publication Date: 2007-10-10
KETAI TECH CHENGDU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method requires a large amount of adsorbent, which is expensive and difficult to regenerate; the chemical method requires a large amount of chemical reagents
These two methods are all low in efficiency, high in cost, and easily cause secondary pollution

Method used

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  • Method for treating arsenic waste solution of hazardous waste by using composite functional bacteria

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specific Embodiment approach

[0046] Fig. 1 shows, and a kind of embodiment of the present invention is: a kind of method for compound functional bacterium processing dangerous waste arsenic waste liquid, and its steps are:

[0047] A. Strain selection and ratio: The composite functional bacteria consist of Desulfovibrio Sp., Desulfotomaculum Sp., and Bacillus megaterium sp., and the ratio of the three strains is :60:50:8.

[0048] B. Cultivation of compound functional bacteria: Cultivate the three types of bacteria in step A according to their strain ratio in the incubator with nutrients containing Fe, S, C, N, and P components. Culture conditions: anaerobic environment, pH 7.0, the temperature is 30°C, and the incubation time is 36 hours.

[0049] C. Treatment of arsenic waste liquid: use the compound functional bacteria and their metabolites and nutrients in the B-step incubator as detoxification substances, and combine them with arsenic waste liquid with a pH of 0.76 to 1.15 and an arsenic concentrati...

Embodiment 2

[0055] This example is basically the same as Example 1, the difference is only:

[0056] The bacterial ratio of the three strains of compound functional bacteria Desulfovibrio Sp., Desulfotomaculum Sp. and Bacillus megaterium Sp. is 56:55:10. Culture conditions: anaerobic environment, pH 7.4, temperature 37°C, culture time 38 hours; arsenic waste liquid pH 2.5-3, arsenic concentration 5662-6140 mg / L arsenic waste liquid, detoxified and detoxified by compound functional bacteria The arsenic waste liquid is mixed and stirred in the first and second bioreactors according to the volume ratio of 5.6-6:1000, and each stage reacts for 20-30 minutes. Add 5 times the volume of 85% sulfuric acid to the sludge and heat it at 170°C for 3 hours to recover As 2 o 3 product. The recovery rate of arsenic is 97%.

[0057] The discharge water has been monitored, and the arsenic content in the discharge water is 0.05mg / L, and the pH is 8.5. The total arsenic and pH in the discharged water a...

Embodiment 3

[0059] This example is basically the same as Example 1, the difference is only:

[0060] The ratio of the number of composite functional bacteria Desulfovibrio Sp., Desul fotomaculum Sp. and Bacillus megaterium Sp. was 41:38:5. Culture condition: anaerobic environment, pH 7.1, temperature 31 ℃, culture time 32 hours; the arsenic waste liquid of pH7.8~9.0, arsenic concentration 201~1765.1 mg / liter of certain workshop of certain copper mine, use the method of the present invention every Processing 4m per hour 3 Arsenic waste. The detoxified substance and arsenic waste liquid from the composite functional bacteria are mixed and stirred in the primary and secondary bioreactors according to the volume ratio of 4-5:1000, the primary reaction is 5 minutes, and the secondary reaction is 30 minutes. The content of As in the sludge is 8.0%, and As is recovered by the sulfuric acid method, 6.5 times the volume of 95% sulfuric acid is added to the sludge, and it is thermally dissolved a...

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Abstract

This invention discloses a method for treating dangerous As-containing wastewater with composite functional bacteria. The composite functional bacteria are obtained by: mixing Desulfovibrio Sp., Desulfotomaculum Sp. and Bacillus megaterium Sp. at a number ratio of (20-65):(15-55):(5-10), and culturing in a culture medium containing Fe, S, C, N and P in anaerobic environment at 30-37 deg.C and pH 7.0-7.4 for 33-38 h. The method comprises: adding the composite functional bacteria and As-containing wastewater (pH = 2.5-9.0, and As concentration = 0.7-6140 mg / L) at a volume ratio of (1-6):1000 into a bioreactor, mixing, stirring for 5-60 min, precipitating in a precipitation pool, and filtering. The method has such advantages as simple process, short treatment period, small floor area, low energy consumption, and no secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of waste liquid treatment, in particular to a method for treating hazardous waste arsenic-containing waste liquid (waste water) by using composite functional bacteria. Background technique [0002] Arsenic (As) and arsenic compound wastes are highly toxic and hazardous wastes. Trivalent arsenic (As 3+ ) is more toxic than pentavalent arsenic (As 5+ ) is highly toxic, and the toxicity of inorganic arsenic is greater than that of organic arsenic. Arsenic and its compounds accumulated in the body have carcinogenic and teratogenic effects. The poisoning dose to humans is 0.01-0.052g, and the lethal dose is 0.06-0.2g. The maximum allowable concentration of arsenic in surface water in my country is 50ug / L; the maximum allowable concentration of arsenic in drinking water in Europe, the United States, Japan and other countries is 10ug / L. Due to the massive mining, production and use of arsenic, the pollution of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C12N1/20C01G28/00
Inventor 李昕吴全珍李福德
Owner KETAI TECH CHENGDU
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