JPS5892951A - Continuous measuring device for biochemical oxygen demand - Google Patents

Abstract

PURPOSE:To enable to perform an automatic and continuous measurement for measuring BOD, by a method wherein a self-sampling device for drainage and a data processor are additionally mounted to a measuring part consisting of a microbe sensor. CONSTITUTION:According to a switching instruction, drainage in an overflow tank 3 is fed to a microbe sensor 12 through a valve switch 11 by a pump 16. Air is mixed by an air pump 17, a BOD concentration is detected according to drainage fed to the microbe sensor 12, and the output is computed by an arithmetic unit 22 to record it in a recorder 24. After the measurement is completed, cleansing water from a cleansing liquid tank 13 is fed out through the valve switch 11. A standard liquid in a standard liquid tank 14 is fed to the microbe sensor 12 through the valve switch 11 about several times a day, and it serves the purpose to produce a detecting line therein.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device for continuously measuring biochemical oxygen demand.

Biochemical oxygen demand in wastewater less than c BOD and η
cormorant. ) Measurement of stones is considered to be one of the essential items of drainage basics. The BOD measurement method is as specified in the Japanese Industrial Standards (Factory Effluent Test Method J Engineering SK 0102). It is calculated from the decrease value of the amount of decrease in dissolved oxygen.

However, this measurement method is completely based on manual analysis, and
Not only is it difficult to automate, but it also has drawbacks such as being complicated and requiring skill.

In order to solve these problems, it was separately proposed to measure BOD using a microorganism sensor with an immobilized microorganism membrane attached to a dissolved oxygen electrode. This immobilized microorganism film is a method of entrapping microorganisms with collagen, etc., and is used as a microorganism sensor by combining this with a dissolved oxygen electrode. If you measure the balanced power supply after opening (fi ~ 30 minutes) and calculate it appropriately, you can measure the required BOD. Since each operation is performed manually, continuous measurement is possible with zero defects.

The purpose of this invention #1 is to use a microbial sensor to automatically and continuously measure BOD.

The present invention is characterized in that it is comprised of a microbial sensor and is equipped with a measuring section #c, an automatic sampling device for wastewater, and a data processing add-on, thereby realizing self-continuous measurement.

An embodiment of the present invention will be explained with reference to the drawings. The water sampling section AFi consists of a pump 2 that collects water from the drainage channel l, a tank that stores the water collected by this, an overflow tank 3, and an overflow tank 3. is the microbial center described later.
This is a book to ensure constant supply of drainage, and it is always filled with new samples, i.e. drainage #IC
&ru.

Measuring part B/V switch all, microorganism storage/+111° cleaning water tank 13. Specimen liquid tank 14. The pulp switching device 11 is mainly composed of a buffer solution tank 15 and a pump 16, and the pulp switching device 11 pumps wastewater, washing water, and sample solution from the storage tank in a predetermined order according to a switching command, and sends them to the pump 16.
The buffer solution to be supplied to the biological sensor is collected from the tank,
tLb supplied to the lump 16) tIk biological sensor;
In the process of blowing air from the static dump l, the dissolved oxygen in the sample water is brought to a saturated state. The above-mentioned standard liquid is used to create a calibration curve using the standard liquid for BOD specified by JIS.
This is a book that allows you to stay at F@. Also, use the cleaning water along with the cleaning cloth.

It is used to return the output of the amount of microorganisms, and the measurement is carried out 5. After each use, wash with washing water.・The microorganism sensor R is constructed by combining a front-mounted oxygen electrode and an immobilized microorganism membrane, and is immersed in a hot water tank 18 and kept at a constant temperature. . And assimilate organic matter by immobilized microorganisms b@
It outputs the amount of oxygen consumed by the current (or voltage) as a current (or voltage). Since this amount of oxygen is proportional to the concentration of organic matter, the output voltage is proportional to the concentration of the output voltage fiFiBOD.#c
1. The measurement by this microorganism sensor laK is carried out by determining the current of 1,000 yen when about 1 to IQ minutes have passed since the test water was supplied.

The data processing unit C includes an ADf converter ill and an arithmetic unit 33.
, a thousand mail [*3. Settings 4. 35. The output from the biological sensor f12, which is generated by the output device 36 and the like, is given to the AD converter 21 via a switch, where it is converted into a digital signal and sent to the arithmetic device 3a.

Then, in the memo section 13K memory, each numerical value necessary for calculation is given, and the required calculation formula is fF zero and BOD
Calculate the concentration and save the calculation results as necessary.
It is recorded on the recorder 25 along with the c storage space. In processing these data, a calibration curve is created in advance using standard solutions, and the BOD concentration of the unknown sample is calculated based on this.
The liquid concentration is set using the setting device 24K, and other settings such as the stone washing time and the method of collecting and supplying each liquid are determined as appropriate using the 1lFi washing water, and the output @ @86 outputs the calculated BOD concentration and switches the pulp changer 11 at t-M in the order set by the setting device or the pulse switch 1ullk as a switching signal.

If necessary, the amount of wastewater w41 is measured by the flow meter 31, and the W* signal from this is sent to the data processing section (3) through the switch 2, where it calculates the pollution load (the combination of concentration and flow rate). Jin and Kame deki, who calculate and measure the product (compared to the product).

For measurement, first issue a switching command.
It is sent into the biological sensor 13, and the path and biosensor 13 are
If the inside of the pipe has already been washed, use the switching command to switch the drain gop in the overflow tank 3! It is sent to the microorganism sensor 12 by the bonder 16 via all. During this process, static electricity is mixed in from the air pump. BOD concentration is detected in the waste water sent into the microorganism sensor 12, and its output is calculated by the calculation device 2, and the calculation result is recorded on the recorder RaK. The one hour required for one measurement is about a few minutes, and as soon as this measurement is finished, the output is switched to 1! according to the output from the output device 26. The IIK switching command is given, and the washing water from the washing liquid tank 13 is sent out from the gopap switch ll, and this process is repeated thereafter.

And at a rate of #c411ii5111 degrees per day, the threshold
Switching command kl, ★ means that the standard liquid in standard liquid tank 14 is switched to pulp! The sample is sent to Microbial Sen+xiK via Ill, where it is used to create a calibration curve.

As described above in detail, according to this invention, a biofilm is used as an immobilization device, and a water sampling section and a device are used.
The BOD measurement of wastewater can be carried out automatically by setting up a coral reef and measuring it in a predetermined order: It is dynamic and allows for continuous measurement in a short period of time.

[Brief explanation of the drawing]

The figure is a configuration diagram showing an embodiment of the present invention. Ao...Water sampling section, B...Measurement section, C...
Data processing section, 20.1471%3...overflow tank, 11. ,,,, Pap switching II, 1m, height-
-e Microbial sensor, 13...Washing tank, 14...
...Standard solution tank, 15...Buffer solution tank, 16.
...Pump, 18...Temperature water tank, sta
...Arithmetic device, dew! s...Record-, Fable 6-
・0・Output device patent applicant Nissin Electric Co., Ltd. Iruka1@ Agent Nakazawa ■nosuke:.

Claims (1)

[Claims] sv! and a water sampling section that collects the target wastewater. A rut biological sensor with an immobilized microbial membrane attached to the dissolved oxygen electrode, a cleaning liquid tank (b) that stores the stone cleaning liquid that is supplied to the *4-object sensor and cleaned each time a measurement is made, and a cleaning liquid tank that is mixed with the collected wastewater. A buffer tank containing buffer solution, which is then sent to the microbial sensor, and A1, which accommodates the standard solution for preparing the calibration curve.
A 1m liquid tank is provided. The washing water is repeatedly applied in a predetermined manner. A measuring section b supplies a buffer solution and a standard solution to the microbial sensor, and an output from the microbial sensor f determines the An arithmetic unit that calculates the production of biochemical acid l!requirements of wastewater, an Al13 recorder that records the calculation results of the arithmetic unit, and an tE jar for the progress of #lI and 4''/. A device for continuously measuring biochemical oxygen demand that is filtered from a data processing section and a data processing section having an output station that issues a detection switching command to a biological sensor.