JPS601545A - Automatic water analyzing apparatus - Google Patents

Abstract

PURPOSE:To measure a plurality of measuring item simultaneously, automatically, and accurately, by operating and outputting the detection of measured components based on the outputs of a plurality of sensors corresponding to each measured component of water to be checked and a temperature sensor and a table of a plurality of analytical curves, which are changed by temperatures, pH, electric conductivity, and the like. CONSTITUTION:The signals corresponding to temperatures, pH, electric conductivity, and concentration from a temperature sensor T provided in water to be checked and a plurality of sensors S1-Sn corresponding to each measured component of the water to be checked are inputted to a CPU22 through amplifiers A0, A1-An, a multiplexer 20, and an AD converter 21. The CPU22 performs operating processing by using analytical curves with regard to temperature, pH, electric conductivity, and concentration and the input signals. The detected values of a plurality of measuring items are outputted to a liquid crystal display device 25 and a printer 26. Opening and closing of a plurality of valves V1-Vn are controlled in correspondence with the detected values, and the amount of supply of correcting liquid is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic water analyzer, and more particularly to an automatic water analyzer for wastewater treatment.

Conventional technology When treating wastewater, for example, the pH, electrical conductivity, calcium hardness, chlorine ions, nitrate ions, nitrite ions, ammonia, etc. of the wastewater are measured, water analysis is performed, and the wastewater is drained. Comprehensively judge whether it is good or not. If it is determined that the liquid cannot be drained as it is, a correction liquid is mixed in to make the liquid drainable and then drained.

When performing such water analysis, conventionally, each component was read by eye or a sampling method (spot analysis) was performed for each component to be measured. Since the condition of the water is judged comprehensively, specialized (chemical) knowledge and training are required, and it is very time consuming to measure each measurement item in one water sample. However, it was not possible to obtain high accuracy, and furthermore, errors such as misidentification were likely to occur.

In addition, because multiple pieces of equipment must be installed and indicators and titrants prepared for each component to be measured, measurements can only be made in locations where the equipment can be installed and chemical substances can be prepared or stored, resulting in a lack of mobility. Ta.

In order to overcome these drawbacks, sensors (electrodes) for each measurement item have been developed,9 and there are sensors in which the concentration of each component to be measured can be determined from the voltage generated between the electrodes of these sensors. If such a sensor is used, the detected value for each measured component can be uniquely determined from the voltage value, and the detection method for each measured component in water analysis can be greatly improved. Since it is affected by ionic strength and pH, it is necessary to calibrate the sensor output voltage for each component to be measured before measurement.

Calibration of this sensor output voltage and measurement of concentration are performed as follows. First, there are two types of village semi-liquid (for example / pI) m
and /00 ppm concentration) are prepared, and the ion electrode and reference electrode are connected to a millivolt meter to measure the electrode potential difference V and V of each standard solution.

, and create a calibration curve as shown in the My diagram using a semi-logarithmic graph with both degrees C on the logarithmic axis and potential ■ on the equal axis. Next, wait until the fluctuation of the electrode potential v3 of the sample stops, and when it becomes constant, read it, and read the concentration C1 from the calibration curve shown in FIG. Such a calibration curve must be created for each measurement item. It is known that the @dose curve changes only due to the influence of temperature with respect to pH and electrical conductivity, and that other values change depending on ionic strength and pH values.

As mentioned above, even in devices that use sensors, it is necessary to calibrate the sensor output voltage for each sensor, and furthermore, it is necessary to calibrate the sensor output voltage for each sensor, and furthermore, it is necessary to determine whether or not to mix the correction liquid into the waste liquid based on each detected value obtained in this way. In the end, it had to be done comprehensively by humans, requiring skill and time.

Purpose and Summary of the Invention The present invention has been made in consideration of the above-mentioned points I, and includes a plurality of sensors provided for each component of sample water to be analyzed, and a sensor that measures the temperature of the sample water. a plurality of tables, one for each of the measured components, containing signals representing a temperature sensor and a plurality of calibration curves that vary with temperature, pH value, and electrical conductivity; one for outputting one of the plurality of calibration curves in response to a signal representing a pH value, and one for each of the measurement components, each of which is one of the plurality of calculation means among the plurality of sensors. a sensor signal from a corresponding one and a corresponding one of said plurality of tables;
By inputting a detection line signal from the sensor and outputting a detected value of the measured component based on the sensor signal from the input calibration curve signal, it is possible to Accurately measure measurement items simultaneously and automatically,
The purpose of this invention is to provide an automatic water analyzer that can significantly shorten measurement time and that can be operated by anyone.

EXAMPLE Hereinafter, an example of the present invention will be explained with reference to the drawings. FIG. 1 schematically explains the water analyzer according to the present invention, taking as an example the waste water treatment of boiler cooling water. In FIG. 2, a boiler l receives cooling water from a mixing tank 3 through a conduit pipe A, and discharges used cooling water to the outside through an interstitial pipe da. A branch pipe C extends from the middle of the conduit q to the measurement tank 3 via a solenoid valve furnace, and from this it is possible to extract waste liquid for water analysis. Measuring tank! A plurality of sensor electrodes S and a temperature sensor T for water analysis are arranged in the water analyzer, and various signals from these sensors are applied to the water analysis apparatus according to the present invention. After the water analysis has been performed, the extracted waste liquid in the measuring tank j is drained by the solenoid valve! The sensor cleaning liquid that cleans the sensor S is discharged to the outside through the conduction pipe j', and is supplied into the measuring tank 3 from the liquid tank g through the conduction pipe 1 by the solenoid valve j1.

The mixing tank 3 is replenished with cooling water through the pipes, and the correction liquid in the plurality of liquid tanks 10 is supplied through the respective pipes lσ and solenoid valves lg. A plurality of liquid tanks 10 are provided corresponding to each of the plurality of sensors S, and each contains nine different types of correction liquids corresponding to the measurement components measured by each sensor. Water analyzers perform calculations based on input signals from various sensors.
The type and amount of the correction liquid to be mixed with the cooling water is determined, and an opening command is given to the corresponding one of the plurality of valves lσ'1. The water analyzer 7 also has valves y@, tl and g
“Give appropriate opening orders to

FIG. 3 schematically shows an embodiment of a water analysis device, designated by the reference numeral 7 in FIG.

As shown in FIG. 1, this device 7 inputs signals from a plurality of sensors S, ie, S, S2..., Sn and a temperature sensor T, and inputs signals from a plurality of valves/ θ1, that is, ■t e % e...

■Output nK command signal. Pulp vi l”21・
....

vn are the sensors S1. S21... corresponds to Sn.

The input signals δ from the sensors T and S, , S, ..., Sn are each input to an amplifier A. , A□, Ao, ...
・.

After being amplified by An, it is applied to multiplexer 2Q, and Maltebrexaco O switches the signals from the sensor in order of seven points and outputs them. Output signal from multi-breather λθ
The signal is converted into a digital signal by an analog/digital (A/D) converter, 2/, and is provided to a processor, 2. Note that the multiplexer O and the A/D converter 2/ are controlled by the processor 2 through the multiple counterfeit control interface 23.

The two processing devices, which may be ordinary electric circuits or microcomputers, are A/D converters.
Calculations are performed based on input signals from the valves V, , V, and the results of the calculations are transmitted to the valve control interfaces 7x and 2Q''l.

..., is given to vn to control the opening and closing of each pulp.

The processing unit has a liquid crystal display device λ! , two printers, a keyboard 27, a digital cassette λj, etc., are connected, and the above calculation results can be displayed and stored.

FIG. 3 is a diagram for explaining the operation of the processing device indicated by the symbol λ in FIG. 3.

In this figure, sensor S1 is a sensor for pH measurement, sensor S! will be described as a sensor for measuring electrical conductivity, and Ss""Sn as a sensor for measuring other concentration.

Sensor 5IsS! The signals from p..., Sn are given to one input terminal of the computing units OF, , OF,..., opn, respectively, and the other input terminals of the computing units are provided with the tables TA, , , , respectively. TA, ,...T
A signal from An is given. Tables TA and T
A, each temperature value 1. ,1. ．． Calibration curve signal D11 corresponding to...? D1! ＃・・・・・・and D2□
#D2! A calibration curve signal corresponding to the temperature signal from the temperature sensor T is selected and outputted to the computing units OP and OP, respectively. As shown in FIG. 5, each calibration curve signal is recorded as a digital signal in which a voltage value and a pH value corresponding to this voltage value are paired. The calculator op□ inputs the digital voltage value from the sensor S and the calibration curve signal selected based on the temperature signal, and calculates the pH value corresponding to this digital voltage value from the calibration curve signal based on the digital voltage value. Select and output. Similarly, the arithmetic unit OPt selects the electrical conductivity from the calibration curve signal and outputs it.

Tables TA, ,...TAn are calibration curve signals D31 e D311 `` `` `` '' regarding various concentrations.
"p D41 e D42 e '""Bow...
...jDnl jDnl j... are recorded, and since these calibration curves change depending on the pH value, each table uses the pH value from the calculator op instead of the temperature value t1#t2y... Signal, pi (1t pH2t・
..., and the calibration curve signal D corresponding to this pH signal is
11゜D1□,...(1=J, $,...
n) is output to each arithmetic unit oP1. Each computing unit OPI selects and outputs various concentration signals from the calibration curve signal in accordance with the digital voltage value from each sensor S1 in the same manner as explained for the computing units op and OF.

The output signals from the computing units op, , op, ,..., opn are sent to the comparators Co, , Co, ,..., respectively.
..., Con, where each reference source R1yRt
t... is compared with the signal from Rn. comparator c
o, , ao2. ....

CON outputs an "O" signal when the output signal from each arithmetic unit is smaller than the reference signal from each reference source.

When the reference signal is large, a "/" signal is output, the corresponding valve is opened, cooling water and a certain amount of correction fluid are mixed and put into the boiler, and then the measurement is performed again. This sequence continues until the corresponding comparator outputs an "O" signal. In this way, when the output signals from all the comparators become "0", the wastewater treatment is completed.

Note that the reference source Rj (j=/, :l,...,n) is
Standard values are set according to the type of wastewater, such as factory wastewater or ships, so that wastewater treatment can be performed according to the type of wastewater.

ja,... are recorded, and the interlocking switch contacts SW, , day W1. . . . can be set to either one by manually operating a switch equipped with SWn.

In the figure, the arithmetic unit OP1. OF、 、・・・・・・、O
A RAM is shown provided on the output side of Fn, so that the output signals of these arithmetic units can be directly written into the RAM. In this way, the output of the arithmetic unit is stored in RAM K
If you fold it, you can save the water analysis value at that time,
It can also be displayed on a display device, 2 left, etc.

In the above embodiments, a case has been described in which the water analysis apparatus according to the present invention is applied to a wastewater treatment system, but the present invention is of course applicable not only to wastewater treatment systems but also to water analysis in general.

As described above, according to the present invention, multiple measurement items can be measured simultaneously and automatically using sensors, so water analysis can be performed using only this device without preparing a lot of equipment. There are young children who say that it is possible to significantly shorten the measurement time, and that anyone can easily operate it without any specialized knowledge. Furthermore, since it can be configured to be compact and portable, it is possible to take the device to a place where water is to be tested and obtain measurement results on the spot. Furthermore, by connecting a cassette chip and a RAM pancage to this device, data can be accumulated and automatic statistical processing of measurement data becomes possible.

Furthermore, by connecting a CRT or printer, it is possible to display various lists, graphs, etc.

[Brief explanation of the drawing]

Figure 1 is a diagram to explain the calibration curve necessary for water analysis, Figure 1 is a diagram schematically showing an example of a wastewater treatment system in which this FjAK water analyzer is used, and MJ diagram. 2 and 3 are block circuit diagrams showing a water analyzer according to an embodiment of the present invention, and FIG. 5 is a diagram for explaining the construction of kb in FIG. 7. In the figure, 7 is a water analysis device, *1
g 82 g...tsnl'i: sensor, T is temperature sensor, TAl, TA2゜...e TAn
Iri Chee 7-le, D Direct□, D□,... D □、D、、、・・・・・・；D□、D
... is the calibration curve signal, OFl, OF, , ...
OPn is a calculation means. Patent Applicant: Information Processing Technology Research Institute, Inc. Procedural Amendment (Voluntary) Display of the case of the Commissioner of the Japan Patent Office, Showa SG, July 1999, Showa 5G, Patent Application No. 10791A, Name of the invention, Automatic water analyzer, Person making the amendment Target of amendment by agent (1) Detailed explanation of the invention column 6 of the specification, contents of amendment (1) The "rank" in line g of page 1 of the specification is amended to "sequentially". (2) "TAnwa" on page 1o, line 9 of the same page is corrected to "'rAnwa". (3) "Infant" on page 1, line 79 is corrected to "effect."

Claims (1)

[Scope of Claims] A plurality of sensors provided for each component to be measured in sample water to be analyzed; a temperature sensor for measuring the temperature of the sample water; a plurality of tables, one for each of the measured components, each containing signals representing a plurality of changing test points, each of which records a plurality of tables, one for each of the measured components; one for outputting one of the calibration curves; and a plurality of calculation means, one for each of the measured components, each calculating means for outputting a sensor signal from a corresponding one of the plurality of sensors and the plurality of calculation means. inputting a calibration curve signal from a corresponding one of the tables, and selecting and outputting a detected value of the measurement component based on the sensor signal from the inputted calibration curve signal. An automatic water analysis device characterized by: