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Interactive type three-chamber biological fuel cell device and method for denitriding wastewater by using device

A biofuel cell, interactive technology, applied in biochemical fuel cells, biological water/sewage treatment, chemical instruments and methods, etc., can solve the doubts about the application prospect of denitrification microbial fuel cells, the low rate of denitrification, and the power generation of batteries. problems such as low capacity, to achieve good environmental and economic benefits, low sludge production, and improved sewage treatment efficiency

Active Publication Date: 2014-06-18
NANJING HEHAI TECH
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AI Technical Summary

Problems solved by technology

In the cathode chamber, when two electron donors (organic carbon source and cathode electrons) coexist, the non-electrode denitrification effect is stronger, and the electrode denitrification effect is weaker, which will make the battery's power generation capacity low and waste the organic carbon source. ; but on the other hand, if no organic carbon source is added, only rely on electrode denitrification, the denitrification rate is very low, affecting the denitrification efficiency
This contradiction makes the application prospect of denitrifying microbial fuel cells questioned

Method used

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  • Interactive type three-chamber biological fuel cell device and method for denitriding wastewater by using device

Examples

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Effect test

Embodiment example 1

[0034] The above-mentioned interactive three-chamber biofuel cell device was used to carry out the denitrification experiment of wastewater containing nitrate nitrogen.

[0035] Step 1: Inoculate the anode chamber (1) with anaerobic sludge, add NaAc (COD: 1000 mg / L) into the anode solution as an electron donor, and inoculate the two cathode chambers (2) with anoxic denitrification sludge, and the cathode enters Water (simulated wastewater) contains sodium acetate (200 mg / L COD) and NaNO 3 (NO 3 –N is 70 mg / L), add 2g / L of Na in addition 2 CO 3 As an inorganic carbon source required for the growth of cathode denitrifying bacteria;

[0036] Step 2: Catholyte sequentially enters the cathode chambers (A, B) on both sides of the three-chamber biofuel cell alternately in batches. First, the cathode on side A is disconnected from the anode, and the cathode chamber on side A is filled with water to carry out the non-organic carbon source. Electrode denitrification;

[0037] Step...

（ example 1）

[0047] A traditional double-chamber denitrification biofuel cell is used, and other experimental conditions are the same as in Example 1, but the negative and positive electrodes are always connected, as a comparison with Case 1. After 48 hours of reaction, the cathode effluent NO 3 -N 28.7mg / L, at this time COD 22.4 mg / L, at this time, the average voltage within 48h is 203.1mV, and the average output power is 18.4mW / cm 2 . The comprehensive denitrification rate is 2.46 mg / (Lh), and the organic carbon source COD / NO consumed by denitrification 3 - The ratio is 4.3, generating 4.46W of electrical energy. Various performance indicators such as organic carbon source consumption are lower than the device of the present invention (case 1), and the amount of treated water is also reduced by half.

[0048]

Embodiment example 3

[0050] Other operating conditions are the same as in Example 1, and no interactive control switch is used for the three-chamber battery, so that the two batteries are opened and closed at the same time, compared with Example 1. There are two processes:

[0051] (1) The non-electrode denitrification process is carried out at the same time on the A and B sides: disconnect the anode and the two cathodes, and after 24 hours of reaction, the cathode NO 3 -N 35.5 mg / L, COD 31.2 mg / L, the denitrification rate of this process is 4.11 mg / (Lh) (the result is the same as the process 1 in the implementation case 1), at this time, the batteries A and B do not produce electricity.

[0052] (2) The electrode denitrification process is carried out at the same time on the A and B sides: the anode and the two cathodes are connected, and after 24 hours of continuous reaction, the single-side cathode NO 3 -N 32.9 mg / L, COD 30.4 mg / L, the denitrification rate of this process is 0.15 mg / (Lh), at t...

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Abstract

The invention discloses an interactive type three-chamber biological fuel cell device and a method for denitriding wastewater by using the device, belongs to the sewage biological remediation and in particular relates to a denitrification treatment method applicable to wastewater containing nitrate nitrogen. By adopting the method, nitrate instead of oxygen is taken as an electron acceptor of a negative electrode on the basis of a conventional two-chamber biological fuel cell, and a three-chamber biological fuel cell consisting of a middle positive electrode chamber and two side negative electrode chambers is built; meanwhile, the conditions of switching on and off a middle positive electrode and two side negative electrodes are controlled interactively through a control switch, so that an electrode denitrification process and a non-electrode denitrification process of the negative electrode are reasonably matched to process. The method is capable of sustainably generating current and effectively removing nitrate nitrogen and saving an organic carbon source needed for denitrification; the method is a novel sewage treatment method based on energy conservation and consumption reduction and is good in application prospect.

Description

technical field [0001] The invention relates to the field of water treatment and resource utilization, in particular to an interactive three-chamber biofuel cell that efficiently treats waste water containing nitrate nitrogen and simultaneously realizes electric energy recovery and its application to waste water denitrification. Background technique [0002] Excessive discharge of nitrogen can lead to eutrophication of water bodies and bring great harm to human beings. Since the "Twelfth Five-Year Plan", my country still insists on thoroughly implementing the basic national policy of resource conservation and environmental protection, and develops a circular economy. The issue of "energy saving and emission reduction" has always been a research hotspot. Therefore, in the face of the ever-increasing pressure to reduce nitrogen in sewage, it is urgent to develop a new technology for denitrification of sewage with "energy saving and emission reduction". [0003] Microbial fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/16C02F3/28
CPCY02E60/527C02F3/282H01M8/16Y02E60/50
Inventor 李超操家顺许明方芳冯骞薛朝霞
Owner NANJING HEHAI TECH
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