Bio-electrochemical system, as well as on-line monitoring device and monitoring method for biochemical oxygen demand (BOD) thereof

Abstract

A bio-electrochemical system, as well as an on-line monitoring device and an on-line monitoring method for biochemical oxygen demand (BOD) thereof. The invention belongs to the technical field of water body monitoring and solves a problem by providing a device and a method, which can achieve sensitive, quick, low-cost and accurate monitoring to BOD in a water body. The bio-electrochemical system can be a M3C sensor, a MFC sensor or a MEC sensor; the M3C sensor includes granular filler, a shell and a tri-electrode system, wherein the shell is in a sealed structure with a chamber therein and is provided with a sample inlet and a sample outlet that are communicated with the chamber; the granular filler is packed in the chamber in the shell and work electrodes are arranged in same; for the MFC sensor or the MEC sensor, granular filler is packed in a bio-anode chamber and/or a bio-cathode chamber. In the bio-electrochemical system, the reactor is filled with granules, so that fluid shear force is high and degradation of a substrate is more complete; therefore, detection sensitivity is higher.

Description

technical field [0001] The invention belongs to the technical field of water body monitoring, and in particular relates to a bioelectrochemical system, an online biochemical oxygen demand monitoring device and a monitoring method thereof. Background technique [0002] Biochemical oxygen demand (BOD) is a comprehensive index reflecting the concentration of organic matter in water and sewage, and is the amount of dissolved oxygen consumed by microorganisms to decompose organic matter in water within a certain period of time, usually expressed in mg / L. The higher the BOD value, the higher the concentration of organic pollutants in the water. The standard determination method of BOD is mostly followed by the method announced by the United States in 1936 at home and abroad, called BOD 5 Law. This traditional BOD 5 There are serious defects in the assay method: it needs to be measured at 20°C, the assay cycle is 5 days, the workload is heavy, the operation is cumbersome, there ...

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Problems solved by technology

This traditional BOD 5 There are serious defects in the assay method: it needs to be measured at 20°C, the assay period is 5 days, the workload is heavy, the operation is cumbersome, there are many interference factors, the repeatability is poor, and there are large errors. The staff need quite high specialized training. And it cannot reflect the changes of water body in time, especially in the process of sewage treatment, it cannot effectively provide information feedback and guide production

[0006] So far, the best MFC technology is HABS-2000 and HABS-2001 developed by the Korea Institute of Science and Technology, which have been applied in countries all over the world, but they use dissolved oxygen as the cathode electron acceptor, and the cathode becomes the limiting factor of the battery. There are the following disadvantages: (1) The cathode chamber requires continuous aeration, which consumes a lot of energy; (2) The cathode catalyst Pt is easily poisoned, and the Pt reserves are scarce and expensive; (3) The structure and operation are relatively complicated, and the maintenance cost is high; (4) Expensive proton exchange membrane is required; (5) The detection result is easily affected by the performance of the cathode; (6) Due to the ion exchange membrane between the cathode and anode chambers, the anode chamber is limited in pressure

The existing M3C BOD monitoring reactors can be classified into two types: large-scale reactors and microfluidic reactors. However, the degradation efficiency of large-scale reactors is low, and the pores of microfluidic reactors are narrow and easy to block, and microorganisms cannot be fixed easily. firm

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