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Device based on microorganism electrolytic tank technique for on-line biochemical oxygen demand measurement

A technology of microbial electrolysis cell and biochemical oxygen demand, which is applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of reducing Coulombic efficiency of anode anaerobic microorganisms, long sensor detection time, and decreased sensor sensitivity. It achieves the effects of short detection time, low detection limit concentration and improved monitoring level

Inactive Publication Date: 2014-09-24
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 based on microorganism electrolytic tank technique for on-line biochemical oxygen demand measurement
  • Device based on microorganism electrolytic tank technique for on-line biochemical oxygen demand measurement
  • Device based on microorganism electrolytic tank technique for on-line biochemical oxygen demand measurement

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Experimental program
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Effect test

Embodiment 1

[0032] 1. The structure of the device for on-line determination of biochemical oxygen demand and the design and assembly of the microbial electrolytic cell sensor

[0033] figure 1 It is a graphic illustration of the device used for the on-line measurement of biochemical oxygen demand. The device includes: connecting pipe 1, sampling pump 2, connecting pipe 3, hydrocyclone 4, hydrocyclone overflow pipe 5, connecting pipe 6 , peristaltic pump 7, connecting pipe 8, automatic sample diluter 9, connecting pipe 10, liquid storage tank 11, connecting pipe 12, peristaltic pump 13, connecting pipe 14, static mixer 15, connecting pipe 16, online degasser 17. Connecting pipe 18, microbial electrolytic cell 19, drain pipe 20, air guide pipe 21, air guide pipe 22, thermostat box 23, liquid storage tank 24, connecting pipe 25, peristaltic pump 26, connecting pipe 27, liquid drain pipe 28, Titanium wire 29 , resistor 30 , wire 31 , potentiostat 32 , titanium wire 33 , data acquisition sys...

Embodiment 2

[0045] 1. The structure of the device for on-line determination of biochemical oxygen demand and the design and assembly of the microbial electrolytic cell sensor

[0046] The device of embodiment 2 is the same as embodiment 1.

[0047] 2. Enrichment of oligotrophic electroactive microorganisms on the surface of the anode electrode of the microbial electrolysis cell

[0048] Glucose-glutamic acid simulated artificial wastewater medium (BOD=5.0 mg / L, pH=7.0) was prepared as in Example 1, and then sodium azide was added to the prepared simulated artificial wastewater medium to 1 mmol / L ( final sodium azide solution concentration).

[0049] The anode chamber of the microbial electrolysis cell 19 is inoculated with the river bottom sediment as the inoculum and the glucose-glutamic acid simulated artificial wastewater as the nutrient solution to enrich the electricity-producing microorganisms. Simulated artificial waste water passes through connecting pipe 1, sampling pump 2, con...

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Abstract

The invention discloses a device based on a microorganism electrolytic tank technique for on-line biochemical oxygen demand measurement. The device comprises a microorganism electrolytic tank, a constant potential meter, connecting tubes, a liquid conveying pump, a hydrocyclone, an automatic sample diluter, a static vortex mixer, an on-line degassing machine, a liquid storage tank, an incubator, a computer and a control system, wherein the computer and the control system are respectively connected with a microorganism electrolytic tank sensor; the microorganism electrolytic tank is connected with the liquid conveying pump, the hydrocyclone, the automatic sample diluter, the static vortex mixer, the on-line degassing machine and the liquid storage tank through the connecting tubes. As the influence of oxygen is eliminated, the device disclosed by the invention has the advantages of high sensitivity, short detection time, wide linear range, low limit of concentration detection, simplicity in operation and the like, the biochemical oxygen demand can be measured on line, and the monitoring level is greatly improved.

Description

technical field [0001] The invention relates to a device for measuring biochemical oxygen demand, in particular to a device for measuring biochemical oxygen demand on-line. Background technique [0002] Biochemical Oxygen Demand (BOD) is one of the most important and widely used indicators to measure water quality. [0003] 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 is not only time-consuming (5d) longer, but also requires good experience and technique to obtain reproducible results. Therefore, it is not suitable for on-line detection of BOD. [0004] Therefore, various alternative methods, especially biosensors, that can rapidly measure BOD have been explored and studied. [0005] Most BOD biosensors rely on an app...

Claims

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Application Information

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IPC IPC(8): G01N27/416
Inventor 李侠蒋海明兰孝文张金山
Owner INNER MONGOLIA UNIV OF SCI & TECH
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