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Device and method for quickly measuring BOD (biochemical oxygen demand) based on microbial electrolysis cell technology

A microbial electrolysis cell, biochemical oxygen demand technology, applied in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of narrow linear range, high detection limit, low reduction efficiency, etc., and achieve a wide range of resistance to heavy metals. , The effect of short detection time and wide linear range

Inactive Publication Date: 2013-10-23
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

However, the disadvantage of this system is that oxygen needs to be constantly supplied to the cathode during operation, because oxygen can diffuse from the cathode chamber into the anode chamber, thereby reducing the Coulombic efficiency and inhibiting the growth of anaerobic microorganisms at the anode, which eventually leads to a decrease in the sensitivity of the sensor. , narrow linear range and high detection limit
In addition, the reduction efficiency of oxygen at the cathode is low, which not only reduces the sensitivity of the sensor, but also makes the detection time of the sensor longer

Method used

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  • Device and method for quickly measuring BOD (biochemical oxygen demand) based on microbial electrolysis cell technology
  • Device and method for quickly measuring BOD (biochemical oxygen demand) based on microbial electrolysis cell technology
  • Device and method for quickly measuring BOD (biochemical oxygen demand) based on microbial electrolysis cell technology

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Embodiment 1

[0041] 1. Preparation of assay device:

[0042]The structure of the measuring device is as figure 2 As shown, it includes: potentiostat 1, cathode chamber 2, platinum-coated titanium mesh cathode electrode 3 (38×50×2 mm, surface area is about 50 cm 2 ), Proton Exchange Membrane (PEM) 4, data acquisition system 5, resistor 6, cathode chamber 7, graphite felt anode electrode 8 (40×50×5 mm, GF series, Electro-synthesis Co., USA) , Silicone gasket 9, sample inlet 10, sample inlet 11, stainless steel screw 12, titanium wire 13, titanium wire 14, titanium wire 15, wire 16, wire 17 and recording and display device 18.

[0043] The cathode chamber 2 and the anode chamber 7 are respectively composed of a polymethyl methacrylate (PMMA) plate (80×100×20 mm), and a cavity of 40×60×12 mm is carved in the middle of each plate. The cathode chamber 2 and the anode chamber 7 of the microbial electrolytic cell are respectively provided with sampling ports 11 and 10 .

[0044] Proton exchang...

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Abstract

The invention discloses a device and method for quickly measuring a BOD (biochemical oxygen demand) based on a microbial electrolysis cell technology. The device adopts a microbial electrolysis cell structure and comprises a microbial electrolysis cell, a data acquisition system and a record cell, wherein the microbial electrolysis cell takes conductive inert materials as an anode electrode and a cathode electrode which are connected with each other through a titanium wire, a potentiostat and a resistor; the data acquisition system is connected in parallel with the resistor; the record cell is connected with the data acquisition system. The method comprises the following steps of: adding a BOD contained sample into the microbial electrolysis cell; measuring electrochemical signals generated by the microbial electrolysis cell; and determining the BOD of the sample according to the relation between the BOD concentration and the size of the electrochemical signals (indicating the maximum current and coulomb quantity) generated by the microbial electrolysis cell. The device and the method have the advantages of high sensitivity, wide linearity range, short detection time, and the like, can be used for measuring the BOD of sewage in an on-line or off-line manner.

Description

[0001] technical field [0002] The invention relates to a device and method for rapid determination of biochemical oxygen demand, in particular to a device and method for rapid determination of biochemical oxygen demand based on microbial electrolytic cell technology. Background technique [0003] Biochemical Oxygen Demand (BOD) is one of the most important and widely used indicators to measure water quality. [0004] The most widely used detection method in BOD determination is five-day biochemical oxygen demand (5-day BOD, BOD 5 ). This method has certain advantages, such as being a universally applicable method that can measure most sewage samples, and moreover, does not require expensive equipment. However, it not only takes a long time (5 d), but also requires good experience and technique to obtain reproducible results. Therefore, it is not suitable for on-line detection of BOD. [0005] Therefore, various alternative methods, especially biosensors, that can rapid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/404
Inventor 蒋海明李侠蔡禄
Owner INNER MONGOLIA UNIV OF SCI & TECH
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