Method for constructing dual-chamber microbial fuel cell-type BOD (biochemical oxygen demand) sensor by using potassium permanganate as cathode electron acceptor

A technology of potassium permanganate and electron acceptor, which is applied in the direction of material analysis, instruments, and scientific instruments through electromagnetic means, which can solve problems such as long response time and small BOD detection range, and achieve shortened response time and shortened detection time , to ensure the effect of data reproducibility

Inactive Publication Date: 2013-07-17
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

So far, basically all MFC-type BOD sensors use dissolved oxygen in water

Method used

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  • Method for constructing dual-chamber microbial fuel cell-type BOD (biochemical oxygen demand) sensor by using potassium permanganate as cathode electron acceptor
  • Method for constructing dual-chamber microbial fuel cell-type BOD (biochemical oxygen demand) sensor by using potassium permanganate as cathode electron acceptor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Use this MFC type BOD sensor to measure BOD in artificial water samples. The tested water samples are artificially prepared in the laboratory. Each liter contains glucose, ranging from 10mg to 1000mg, and also contains (NH 4 ) 2 SO 4 , 0.56g; MgSO 4 ·7H 2 O, 0.2g; CaCl 2 , 15mg; FeCl 3 ·6H 2 O, 1 mg; MnSO 4 ·H 2 O, 20 mg; NaHCO 3 , 0.42g; phosphate buffer solution (1M, pH7.0), 50ml; L-cysteine ​​(used as an oxygen absorber), 20mg.

[0023] (1) Design and assembly of MFC-type BOD sensor: This double-chamber MFC is made of plexiglass, the size of the two pole chambers is 5cm×5cm×1.2cm, and the volume is 30cm 3 , each pole chamber has four tubular channels with a length of 3 cm and an inner diameter of 0.6 cm, which are used for solution in and out and wire connection. The electrode material is graphite felt with a porosity of 7%, and each electrode consists of 6 pieces of graphite felt with a size of 4cm×1cm×0.3cm connected in series with wires. The middle sepa...

Embodiment 2

[0030] This MFC type BOD sensor is used to measure BOD in artificial water samples. The difference between this embodiment and Embodiment 1 is that the concentration of potassium permanganate is 5 mmol / L, and other steps and parameters are the same as in Embodiment 1.

[0031] Artificial wastewater with different concentration gradients was prepared as the anode chamber solution, and potassium permanganate solution with a concentration of 5 mmol / L was used as the cathode chamber solution. The MFC output current and detection time were recorded respectively, and the MFC production capacity corresponding to different wastewater BOD concentrations was calculated. Linear fitting was performed on the production capacity and BOD concentration, and the linear equation C=0.016BOD+0.088 was obtained. When BOD is less than 400mg / L, the two show a good linear relationship, R 2 = 0.994. Therefore, when the concentration of potassium permanganate is 5mmol / L, the detection limit of this se...

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Abstract

The invention provides a method for constructing a dual-chamber microbial fuel cell (MFC)-type BOD (biochemical oxygen demand) sensor by using potassium permanganate as cathode electron acceptor, which belongs to the field of waste water quality monitoring. The method specially comprises the steps of constructing a dual-chamber MFC reactor; enriching electricigenic microorganisms on an MFC anode plate, and adjusting an external resistor to obtain maximum MFC output power; respectively adding different concentrations of artificial sewage and potassium permanganate solution into an anode chamber and a cathode chamber of the MFC, calculating the generated electricity of the MFC corresponding to different BOD concentrations according to MFC output current and detection time; and processing the generated electricity and BOD by linear fitting to obtain a sensor detection limit and a linear equation. After a to-be-tested solution with unknown BOD value is added into the anode chamber of the MFC, the generated electricity of the MFC is calculated according to the MFC output current and the detection time; and the BOD value of the to-be-tested solution can be calculated according to the known linear equation. The MFC-type BOD sensor using potassium permanganate as cathode electron acceptor has the advantages that the BOD detection range is widened to be 500mg/L; the detection time is shortened by 50% or more; and the detection relative error is less than 10%. Accordingly, the MFC-type BOD sensor has a high application value.

Description

technical field [0001] The invention belongs to the technical field of wastewater quality monitoring, and in particular relates to a construction method and application of a dual-chamber microbial fuel cell (Microbial Fuel Cells, MFC) BOD sensor using potassium permanganate as a cathode electron acceptor. The MFC type BOD sensor of the invention can be applied to rapid detection of wastewater BOD in a wide range, and has a wide detection range and good accuracy and stability. technical background [0002] In recent years, with the continuous development of my country's industry and urban construction, the problem of environmental pollution has become increasingly prominent. Among the many environmental pollutions produced in the process of economic development, the problem of water pollution is particularly serious, and organic matter is an important aspect of water pollution. Biochemical Oxygen Demand (BOD) is a comprehensive index reflecting the content of organic matter i...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01N27/327
Inventor 张盼月田帅张光明梁英梅海冰寒
Owner BEIJING FORESTRY UNIVERSITY
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