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

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...

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

Images