Reactor type instrument for quickly determining biochemical oxygen demand

Abstract

The invention discloses a BOD rapid detecting analyzer of water pollution monitor, which is characterized by the following: setting a cage in the biochemistry reaction measuring chamber; placing the solidified microbial particle in the cage; contacting the detected water sample in the biochemistry reaction measuring chamber directly through microscale aerated conduit; adapting metal hot container to cover the thermostatic device. The invention uses the aerated conduit instead of the magnetic blending device to accomplish rapid mass transformation and dissolved oxygen balance, which shortens the measuring time and changes the device periodically.

Description

technical field [0001] The invention relates to a biochemical oxygen demand (BOD) fast measuring and analyzing instrument in water quality pollution monitoring, in particular to the structural design of a reactor-type biochemical oxygen demand fast measuring instrument, which belongs to the technical field of environmental monitoring. Background technique [0002] The rapid determination of BOD is carried out by biosensors. Typical foreign products include NisshinBOD-300 from Japan and Biomonitor from Germany. In China, there is the MS-1 BOD detector developed by Wuhan Institute of Virology, Chinese Academy of Sciences. Because MS-1BOD and BOD-300 are basically the same in principle and measurement method, only the flow state in the measurement chamber is slightly different. [0003] Both BOD-300 and Biomonitor are functionally divided into four parts: sampling unit, water sample conversion unit, measurement unit, control, data recording and processing unit, and the measurem...

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Problems solved by technology

Therefore, it is generally only used for the determination of BOD concentration in sewage treatment plants, but it cannot meet the monitoring of natural water bodies far away from sewage treatment plants.

The second is the frequent replacement of microorganisms in sensitive materials, which will lead to the lack of a unified benchmark for measurement due to the inconsistency of the microbial activity status of each group

[0005] The BOD-300 instrument adopts the biofilm embedding method for microorganisms. Although the biofilm in the biofilm embedding method is provided by the manufacturer of the instrument, which can ensure the microorganisms required for measurement, this instrument also has the following problems: First, the dissolved oxygen probe in the instrument does not measure the real dissolved oxygen content in the test water sample, but the amount of oxygen diffused through the biofilm, which weakens the electrical signal by 3-6 orders of magnitude

However, the device adopts the form of magnetic stirring, which is difficult to control in the actual reaction process, and the magnetic stirring bar is easy to get out of control, resulting in the need to start the magnetic stirring device multiple times during a stirring process, which greatly increases the measurement time

In addition, the immobilized microorganisms in the device are directly placed in the biochemical reaction measurement chamber, which may easily lead to blockage of the drain and is not conducive to the periodic removal of immobilized microorganisms.

In addition, the instrument places the measurement chamber in a constant temperature water bath, resulting in a large overall volume and complex structure, which is not conducive to the development of instrument miniaturization

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