Method for treatment of metal waste water by sulfate reducing bacteria growing up with electric current

A sulfate and heavy metal technology, applied in biological water/sewage treatment, mining wastewater treatment, metallurgical wastewater treatment, etc., to achieve the effect of low potential, avoid secondary pollution, and simple operation

Inactive Publication Date: 2012-08-22
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the restrictive factors for sulfate reduction that hydrogen is used as an electron donor, and uses a polarized electrode as a direct electron dono

Method used

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  • Method for treatment of metal waste water by sulfate reducing bacteria growing up with electric current
  • Method for treatment of metal waste water by sulfate reducing bacteria growing up with electric current
  • Method for treatment of metal waste water by sulfate reducing bacteria growing up with electric current

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Effect test

Embodiment 1

[0033] Example 1: Sulfate Reduction and Sulfide Generation Using Electrode as the Only Electron Donor

[0034] Construction of bioelectrochemical reaction device

[0035] The bioelectrochemical device is a double-chamber reactor configuration ( figure 1 ), including potentiostat 4, wire 5, cathode chamber 1 and anode chamber 2. A working electrode 6 and a reference electrode 7 are inserted into the cathode chamber 1, and activated sludge from a municipal sewage plant is added; an auxiliary electrode 8 is inserted into the anode chamber 2; the two chambers are separated by a diaphragm 3 .

[0036] Preparation of cathodic and anode compartment solutions

[0037] Anode chamber

[0038] 0..05mol / L phosphate buffer solution (pH 7.0)

[0039] Cathode chamber

[0040] Na 2 HPO 4 12H 2 O 10.9g L -1 , NaH 2 PO 4 3.0 g L -1 , NaHCO 3 2.0gL -1 , KCl 100mg L -1 , MgCl 2 40mgL-1 , NH 4 Cl 310mgL -1 , CaCl 2 50mgL -1 , NaCl 10 mg L -1 , FeCl 2 25mgL -1 , CoCl 2 ...

Embodiment 2

[0054] Embodiment 2: sulfide reduction metal copper ion test

[0055] The soluble sulfides produced by sulfate reducing bacteria are S 2- 、HS - 、H 2 S, their morphology is related to pH, according to literature reports, when pH2 The concentration of S is relatively large, and HS is between pH 7-13 - Mainly, pH>13 with S 2- Mainly. Carry out the operation of bioelectrochemical reaction according to the step of embodiment 1, because catholyte contains buffer solution, pH about 8 after sulfate reduction, sulfide in catholyte should be HS - Mainly, therefore, when the sulfide concentration in the reactor continues to reach above 50mg / L, the reactor effluent is passed into the reactor containing 100mg / L Cu in a ratio of 1:1 2+ Copper sulfide precipitates are formed after low-concentration wastewater, and Cu in wastewater is detected 2+ Content, Cu in the supernatant after precipitation 2+ Content below 5mg / L, Cu 2+ The removal rate is greater than 95%.

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Abstract

The invention belongs to the technical field of treatment of waste water, and particularly relates to a method for reduction of sulfate into sulfide and treatment of metal waste water by sulfate reducing bacteria growing up with electric current. The sulfate reducing bacteria provided by the invention is a mixing bacteria group, which comprises Desulfobulbus propinonicus, geobacter sulfurreducens. Under the condition of lacking organic carbon resource, an electrode is used as the only electronic donator for growing, sulfate is reduced into sulfide via bioelectrical chemistry, and the sulfide is applied to the treatment of metal waste water. According to the method provided by the invention, the defect that organic carbon resource is needed to be used as the electronic donator is overcome,the operation is simple, the secondary pollution is zero, the cost is low, and is particularly suitable for the treatment on organic carbon metal waste water of mine waste water, metal smelting wastewater, electric plating waste water and the like.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for reducing sulfate to sulfide by using electric current-grown sulfate-reducing bacteria and applying it to heavy metal waste water treatment. Background technique [0002] With the development of modern industry, a large amount of heavy metal wastewater is produced every year, and sulfide is an important means of extracting valuable metals. The traditional biological method is to dissimilate and reduce sulfate to H by sulfate-reducing bacteria 2 S (CN101506104A) or sulfate-reducing bacteria to produce biological sulfur-iron composite materials (CN101935100A), under different pH control, can be used to realize the selective precipitation of metal sulfides to remove heavy metal ions and reclaim valuable metals in wastewater. It has the characteristics of low cost and strong adaptability. [0003] However, the growth of sulfate-reducing bacteri...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F1/52C02F103/10C02F103/16C02F101/20
Inventor 李大平苏文涛何晓红陶勇张礼霞
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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