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Method for recycling sulfur in wastewater by microbial fuel cell

A technology of fuel cells and microorganisms, which is applied to the disposal/recycling of fuel cells, biochemical fuel cells, fuel cells, etc., and can solve the problems of not being able to recover the energy of sulfur pollutants, so as to avoid the addition of high-cost catalysts and realize the recovery of electric energy Effect

Active Publication Date: 2019-03-08
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problems to be solved by the present invention are: one is that traditional biological desulfurization technology cannot recover the energy contained in sulfur pollutants; the other is that sulfur-containing wastewater (such as anaerobic digestion liquid, etc.) At the same time, it is necessary to prepare for the subsequent denitrification and denitrification (that is, to complete the nitrification of ammonia nitrogen)

Method used

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  • Method for recycling sulfur in wastewater by microbial fuel cell

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Effect test

Embodiment 1

[0045] The dual-chamber microbial fuel cell used in this test has an effective volume of 200ml for each chamber of the cathode and anode, and the device uses graphite fiber as the electrode material. Before the operation of the microbial fuel cell, the cathode graphite fiber filaments are soaked in aerobic sludge to absorb microorganisms. After a period of time, the corresponding microorganisms can be propagated and enriched on the anode and cathode, and the anode is not inoculated with sludge. The dual-chamber microbial fuel cell operates intermittently at 25° C., the operating cycle is 12 hours, 200 ml of water is fed each time, and the resistance of the external circuit is set to 100Ω. The specific operation is as follows:

[0046] 1) The sewage containing sulfide (64mgS / L) and ammonia nitrogen (27.2mgN / L) is injected into the anode chamber of the microbial fuel cell through a peristaltic pump.

[0047] 2) The sulfides are oxidized in the anode chamber mainly through self-...

Embodiment 2

[0053] The dual-chamber microbial fuel cell used in this test has an effective volume of 200ml for each chamber of the cathode and anode, and the device uses graphite fiber as the electrode material. Before the operation of the microbial fuel cell, the cathode graphite fiber filaments are soaked in aerobic sludge to absorb microorganisms. After a period of time, the corresponding microorganisms can be propagated and enriched on the anode and cathode, and the anode is not inoculated with sludge. The dual-chamber microbial fuel cell operates intermittently at 25° C., the operating cycle is 12 hours, 200 ml of water is fed each time, and the resistance of the external circuit is set to 100Ω. The specific operation is as follows:

[0054] 1) The sewage containing sulfide (128mgS / L) and ammonia nitrogen (27.2mgN / L) is injected into the anode chamber of the microbial fuel cell through a peristaltic pump.

[0055] 2) The sulfides are oxidized in the anode chamber mainly through self...

Embodiment 3

[0061] The dual-chamber microbial fuel cell used in this test has an effective volume of 200ml for each chamber of the cathode and anode, and the device uses graphite fiber as the electrode material. Before the operation of the microbial fuel cell, the cathode graphite fiber filaments are soaked in aerobic sludge to absorb microorganisms. After a period of time, the corresponding microorganisms can be propagated and enriched on the anode and cathode, and the anode is not inoculated with sludge. The dual-chamber microbial fuel cell operates intermittently at 25° C., the operating cycle is 12 hours, 200 ml of water is fed each time, and the resistance of the external circuit is set to 100Ω. The specific operation is as follows:

[0062] 1) The sewage containing sulfide (192mgS / L) and ammonia nitrogen (27.2mgN / L) is injected into the anode chamber of the microbial fuel cell through a peristaltic pump.

[0063] 2) The sulfides are oxidized in the anode chamber mainly through self...

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Abstract

The invention provides a method for recovering sulfur in wastewater by using a microbial fuel cell. The method comprises the following steps of building a double-chamber desulfuration microbial fuel cell; pumping wastewater containing nitrogen and sulfur into a positive electrode chamber of the microbial fuel cell, allowing a sulfide to be oxidized into elemental sulfur to cover the surface of a positive electrode mainly through a self-generating chemical effect so that sulfur recovery is achieved, and transmitting electrons generated through oxidation of the sulfide to a positive electrode through an external circuit so as to achieve electric energy recovery; and allowing water to flow out of the positive electrode chamber and enter a negative electrode chamber, making the electrons transferred from the external circuit oxidized under the catalytic action of microorganism by taking oxygen as an electron receptor, simultaneously making ammonia nitrogen in the wastewater oxidized to nitrate nitrogen for preparing nitrogen removal by denitrification in a subsequent step. According to the method, the sulfur and the energy are recovered from the sulfur-containing wastewater by using the microbial fuel cell.

Description

technical field [0001] The invention relates to the technical field of sewage biological desulfurization, in particular to a method for recovering sulfur in waste water by utilizing a microbial fuel cell. Background technique [0002] The anaerobic digestion solution of sulfur-containing organic wastewater contains a large amount of sulfide that needs to be effectively removed. At present, biological sulfur removal technology is the most economical and effective method to solve the sulfur pollution of sewage. However, traditional biological sulfur removal technology cannot recover the sulfur pollutants when treating sewage. contained energy. [0003] Microbial fuel cells developed in recent years can recover electrical energy while removing pollutants, for example, see document 1 (Rabaey K, Van de Sompel K, Maignien L, et al. Microbial fuel cells for sulfideremoval. Environmental science & technology, 2006, 40 (17 ):5218-5224.). This technology can recover electric energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/16H01M8/00C02F9/06
CPCH01M8/008H01M8/16Y02E60/50Y02W30/84
Inventor 张少辉鲍任兵赵丽桑稳姣
Owner WUHAN UNIV OF TECH
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