Sensor type on-line monitor of biochemical oxygen demand

A biochemical oxygen demand and sensor technology, which is applied in biological testing, microbial measurement/inspection, biochemical equipment and methods, etc., can solve the problems of decreased sensitivity, constant temperature and non-constant oxygen, and relatively high requirements, so as to improve measurement stability Effect

Inactive Publication Date: 2007-07-18
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0005] The reactor-type rapid biochemical oxygen demand tester reported in patent CN1790002A has expanded the linear measurement range, but it can be seen from the linear equation ΔDO=0.0082×BOD that it gives, for the sample whose BOD content is 10mg / L, its oxygen sensor The DO difference is less than 0.1mg / L, which is quite high for the DO instrument. For the detection of low-content samples, its sensitivity will inevitably decrease; the microbial sensor thermostat device reported in patent CN2746392Y uses metal aluminum blocks and constant temperature water baths to convect The sample or buffer solution and microbial sensor in the pipeline are heated to make it under constant temperature conditions. Similarly, this method is only a method of constant temperature and not constant oxygen; the constant temperature device reported in patent CN2747576Y and the one reported in patent CN1709577A Constant temperature and constant oxygen devices are suitable for specific reactor BOD measuring instruments

Method used

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 The present invention provides a sensor-type BOD online monitor.

[0036] The present invention provides a sensor-type BOD on-line monitor, which has a sampling unit A, a signal acquisition, processing and control unit B and a measurement unit C.

[0037] Fig. 1 is its structural schematic diagram, among the figure, 11 is buffer solution cup, 12 is measuring sample cup, 14 is microbial film sensor, 15 is sampling electromagnetic valve, 17 is peristaltic pump, 19 is sampling pump, 56 is sampling pump, 57 is the sampling cup;

[0038] Described sampling unit A is as shown in Figure 2, and among the figure 58 is a water source, 56 is a sampling pump, 57 is a sampling cup, 59 is a sampling tube, and 54 is a filter element;

[0039] The sampling pump 56 takes samples from the water source 58 at a speed of 100ml / s and sends them to the sampling cup 57. After the cup is full, the water sample flows back to the water source through the water intake pipe 59. The fi...

Embodiment 2

[0044] Embodiment 2 The measurement unit of the sensor-type online BOD monitor

[0045]The present invention provides a sensor-type BOD on-line monitor, which has a sampling unit A, a signal acquisition, processing and control unit B and a measurement unit C. Wherein, the measurement unit C is shown in FIG. 4 . Including thermostatic controller 1, water tank 2, electric pump 3, circulating water outlet 4, circulating water inlet 5, heating resistor 6, temperature sensor 7, air pump 8, microbial film sensor fixing clip 9, fixing bracket 10, buffer solution cup 11 , measuring sample cup 12, air purification cup 13, microbial film sensor 14, sampling solenoid valve 15, waste discharge solenoid valve 16, peristaltic pump 17, peristaltic pump 18, sampling pump 19, self-overflow pipe 20, waste discharge pipe 21, inlet Air pipe 22, air outlet pipe 23, air outlet pipe 24, pipeline fixing ring 25, pipeline fixing ring 26, porous air explosion pipe 27, porous air explosion pipe 28, wat...

Embodiment 3

[0054] Embodiment 3 uses a sensor-type online BOD monitor for online BOD detection implementation steps

[0055] The buffer solution cup 11, the air purification cup 13 and the measuring sample cup 12 are suspended on the fixed support 10 through the side ears 32, the side ears 33, the side ears 34, the side ears 35, the side ears 36, and the side ears 37 respectively; The inner water pipe 29 is connected by a flexible pipe 38, and the water pipe 29 outside the water tank 2 is connected to the flexible pipe 39 and put into the buffer solution storage barrel 51, which is formed by the overflow pipe 20, the flexible pipe 38, the water pipe 29, and the flexible pipe 39. The passage is used for the overflow of the buffer solution; the waste discharge pipe 21 is connected with the water pipe 30 in the tank 2 through a hose 40; Control, the waste liquid is discharged into the waste liquid barrel 52 through the passage formed by the waste discharge pipe 21, the hose 40, the water pip...

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Abstract

A BOD on-line detector of sensor type is prepared as transferring sample in filter element of sampling unit A to sample cup of measuring unit C through sampling pump, connecting microbiological membrane transducer of measuring unit C to electrode interface of controlling unit B, applying instrument software to directly calculate out BOD of sample based on measurement signals of microbiological membrane transducer through signal collector and signal amplifier.

Description

technical field [0001] The invention relates to an on-line monitor for biochemical oxygen demand (BOD) of water quality, in particular to a sensor-type on-line monitor for biochemical oxygen demand. Background technique [0002] Biochemical oxygen demand is an important indicator for analyzing the content of organic pollutants in water bodies, and is one of the most important parameters in routine monitoring of water quality. The current standard dilution method (BOD 5 method) has many deficiencies, such as long time, heavy workload, cumbersome operation, many interference factors, poor repeatability, and cannot reflect water quality changes in time, and cannot realize online monitoring of water quality. [0003] In recent years, some new measurement methods have appeared one after another, among which microbial film sensors and microbial reactors are the main ones. Microbial reactor type rapid BOD analyzer, representative products such as Biomonitor produced by German LAR...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/50G01N27/403C12Q1/02
Inventor 刘长宇郏建波董绍俊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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