JP2000176443A - Operation control method and device of adsorption column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a operation control method and device capable of easily monitoring treated water quality and facilitating the replacement or regeneration of a packed material without delay. SOLUTION: A the time of operating the adsorption columns 1, 2 and 3 in which the liq. to be treated containing plural subject material to be removed such as fluorine and arsenic is circulated, the subject material to be removed such as fluorine which reaches most rapidly to the upper limit to which breakthrough to treated water is permitted is previously selected. The liq. to be treated is circulated to the adsorption columns 1 and 2, and only the concn. of the selected subject material to be removed in the treated water is watched by fluorine concentration meter 16, etc., and at the time when the concn. reaches the upper limit concn., the packed material such as activated alumina 4 in the adsorption column 1 is exchanged or regenerated, and also the flow passage of the liq. to be treated is switched to the columns 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation management method and apparatus for an adsorption tower used in water treatment such as water purification treatment, sewage treatment, human waste treatment, industrial wastewater treatment, and landfill leachate treatment.

[0002]

2. Description of the Related Art In water treatment such as water purification treatment, sewage treatment, human waste treatment, industrial wastewater treatment, landfill leachate treatment, etc., water is used to remove trace amounts of organic substances, oxidizing agents, and certain heavy metals. Towers may be used.

[0003] The packing material packed in the adsorption tower is saturated as the water flows, and the concentration of the substance to be removed in the treated water flowing out rises. I have to.

In determining the timing of replacing or regenerating the filler, the concentration of the substance to be removed in the treated water is continuously monitored online, or the substance to be removed that cannot be monitored continuously is treated and collected. Analyzes are carried out inside the facility or at an external analytical institution.

[0005]

However, when a substance to be removed, which cannot be continuously monitored online, is analyzed in a processing facility, analysis equipment and labor are required. Not only is the cost high, but it takes time to get results.

However, for example, in the field of water purification,
Some municipalities have set the arsenic water quality standard to be as strict as 0.01 μg / L and monitor the arsenic concentration in the treated water daily for arsenic removal in the adsorption tower. However, as described above, arsenic analysis requires analytical equipment, labor, and time, so that it is difficult to monitor daily with a simple water supply facility or the like.

An object of the present invention is to solve the above-mentioned problem and to provide an operation management method and apparatus for an adsorption tower which can easily monitor the quality of treated water and can exchange or regenerate a filler without delay. It is assumed that.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method for managing the operation of an adsorption tower through which a liquid to be treated containing a plurality of substances to be removed is passed. The maximum concentration at which leakage is allowed is set for each substance to be removed, and the substance to be removed that reaches the set upper limit concentration value is selected in advance, and when the liquid to be treated is passed through the adsorption tower,
Monitor the concentration of the selected removal target substance in the processing liquid flowing out,
The present invention provides an operation management method for an adsorption tower, wherein the filler in the adsorption tower is replaced or regenerated when the upper limit concentration value is reached.

[0009] An operation management apparatus for performing the above-mentioned operation management method for an adsorption tower, comprising: a liquid feed pipe system for communicating a plurality of adsorption towers in series with each other; and an inflow pipe system for communicating with the inflow side of each adsorption tower. An outflow piping system communicating with the outflow side of each adsorption tower,
A plurality of automatic valves interposed in each of the piping systems to form a flow path passing through a predetermined adsorption tower, and a water quality monitoring device for monitoring the concentration of the selected removal target substance in the treatment liquid derived by the outflow piping system And a control device which is connected to the automatic valve and the water quality monitoring device and stores an upper limit concentration value set for the selection and removal target substance. An adsorption tower, characterized in that an automatic valve is opened and closed when the measured concentration value of the target substance reaches the upper limit concentration value to form a separate flow path excluding the uppermost adsorption tower. An operation management device is provided.

[0010] In the operation management device for an adsorption tower described above, the control device is provided with alarm means for issuing an alarm to an operation manager when the measured concentration value of the selected removal target substance reaches the upper limit concentration value. And an operation management device for the adsorption tower.

Here, the upper limit concentration set for each substance to be removed is equal to or lower than a water quality reference value, preferably a predetermined concentration lower than the water quality reference value. The substances to be removed that reach the upper limit concentration earliest are selected by preliminary tests or by literature.

Therefore, when the concentration of the selected removal target substance reaches the upper limit concentration value, the selected removal target substance is at the water quality reference value (or a lower predetermined concentration), and the other removal target substances are below the water quality reference value. , The time can be determined as the time to replace or regenerate the filler.

Therefore, as described above, by monitoring the concentration of only the selected substance to be removed and detecting the time point when the concentration reaches the upper limit value, it is possible to easily determine the time to replace or regenerate the filler.

At this time, by replacing or regenerating the filler and switching to a separate flow path when there are a plurality of adsorption towers, the water quality of the treatment liquid can be constantly maintained at a high level.

In the case where the substance to be selected and removed is a substance which can be continuously monitored, the measurement result can be obtained promptly so that the water quality of the treatment liquid can be maintained at a high level. By setting the upper limit concentration somewhat lower and measuring at appropriate time intervals, the water quality of the treatment liquid can be guaranteed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In the water purification system shown in FIG. 1, the first adsorption tower 1, the second adsorption tower 2, and the third adsorption tower 3 are for removing fluorine and arsenic, and each column is filled with activated alumina 4. ing. Between each of the adsorption towers, a liquid sending pipe 5 that communicates a lower part of the first adsorption tower 1 and an upper part of the second adsorption tower 2, and a lower part of the second adsorption tower 2 and an upper part of the third adsorption tower 3. And a liquid sending pipe 7 that connects a lower part of the third adsorption tower 3 and an upper part of the first adsorption tower 1 to each other.
Solenoid valves (may be other automatic valves such as air-operated valves) 5a, 6a, 7a are interposed in the respective liquid feeding pipes 5, 6, 7.

Inflow pipes 8, 9, and 10 communicate with upper portions of the first adsorption tower 1, the second adsorption tower 2, and the third adsorption tower 3 via solenoid valves 8a, 9a, and 10a, respectively. Below the third adsorption tower 3, the first adsorption tower 1, and the second adsorption tower 2,
Outflow pipe 11 and outflow pipe 1 opening in the middle of the pipe
2, 13 communicate with each other via solenoid valves 11a, 12a, 13a.

The outflow pipe 11 is guided to a treatment water tank 15 provided with a treatment water discharge system 14, and in the middle of the outflow pipe 11, the concentration of fluorine contained in the treatment liquid flowing through the pipe is measured. A fluorine concentration meter 16 is provided.

The control device 17 is connected to the fluorine concentration meter 16 by a signal line 18, and controls the solenoid valves 5a to 13a.
a, which is connected to a signal line 19 (only part of which is shown for simplicity of the figure) and stores a preset upper limit concentration value of fluorine (a predetermined concentration value lower than a water quality reference value). When the concentration value measured by the fluorine concentration meter 16 reaches the upper limit concentration value, one of the solenoid valves 5a to 5
13a is configured to open and close to form a flow path excluding the uppermost adsorption tower.

An operation method of the adsorption equipment having the above configuration will be described. At the start of operation, the solenoid valves 8a, 5a, 13a
Is opened, and the liquid to be treated flows sequentially to the inflow pipe 8, the first adsorption tower 1, the liquid sending pipe 5, and the second adsorption tower 2, and the fluorine and arsenic in the liquid to be treated are removed from the first adsorption tower. The purified treated water 20 which is adsorbed and removed by the activated alumina 4 filled in the first and second adsorption towers 2 and flows out of the outflow pipe 13 and the outflow pipe 1
1 to the treated water tank 15.

At this time, the concentration of fluorine contained in the processing liquid 20 flowing inside the outflow pipe 11 is
And the measurement data is transmitted to the control device 17. When the transmitted measured concentration value reaches the upper limit concentration value, the control device 17 causes the solenoid valves 8a and 5a to be measured.
Is closed, and the solenoid valves 9a and 6a are opened.

As a result, the liquid to be treated flows sequentially into the inflow pipe 9, the second adsorption tower 2, the liquid feeding pipe 6, and the third adsorption tower 3, and the fluorine and arsenic in the liquid to be treated are the same as described above. Water 20 absorbed and removed by activated alumina 4
Is led out to the treated water tank 15 through the outflow pipe 11. Meanwhile, the activated alumina 4 inside the first adsorption tower 1 is exchanged.

At this time, the concentration of fluorine contained in the processing liquid 20 flowing through the inside of the outflow pipe 11 is also measured by the fluorine concentration meter 1.
6, the measurement data is transmitted to the control device 17, and when the transmitted measured concentration value reaches the above-described upper limit concentration value, the control device 17 causes the solenoid valves 9a, 9
is closed, and the solenoid valves 10a and 7a are opened.

As a result, the liquid to be treated is supplied to the inflow pipe 10,
The fluorine and arsenic in the liquid to be treated are adsorbed and removed by the activated alumina 4 in the same manner as described above, and flow into the third adsorption tower 3, the liquid feed pipe 7, and the first adsorption tower 1.
Is led out to the treated water tank 14 through the outflow pipe 12 and the outflow pipe 11. Meanwhile, the activated alumina 4 inside the second adsorption tower 2 is exchanged.

In this way, the time when the activated alumina 4 of the upstream adsorption tower has reached breakthrough is detected by using the continuously monitorable fluorine as an index, and the flow path is switched to the flow path excluding the upstream adsorption tower. In the meantime, the activated alumina 4 which has reached the breakthrough is replaced, so that the fluorine concentration in the treatment liquid 20 is always maintained at the concentration lower than the upper limit, that is, lower than the water quality reference value. This means that the arsenic concentration in the treatment liquid 20 is always maintained at or below the water quality reference value, and the water quality of the treatment liquid is kept high.

The relationship between the fluorine concentration and the arsenic concentration is based on the fact that the activated alumina adsorption column can obtain a breakthrough curve of fluorine and arsenic as shown in FIG.

As shown in FIG. 3, an alarm device such as a telemeter 21 near the operation manager is connected to the control device 17 through a telephone line 22 so that the measured concentration value of the substance to be selected and removed is equal to the upper limit concentration value. The alarm signal may be sent from the control device 17 to the telemeter 21 at the time when the temperature has reached.

In this case, the operation manager who has acknowledged the alarm with the telemeter 21 immediately goes to the water treatment facility and confirms that the control device 17 has opened and closed the appropriate solenoid valve and changed the flow path. When the control device 17 does not perform the valve opening / closing operation function, an appropriate solenoid valve is manually opened / closed to change the flow path.

The method as described above can also be carried out in combination with other fillers and the substance to be removed. For example, even in an adsorption tower filled with bone char, the operation of adsorbing a liquid to be treated containing fluorine and arsenic can be favorably managed by monitoring only fluorine.

Also, Sumichelate (registered trademark) MC-7
In an adsorption tower filled with a chelate resin commercially available as No. 5, the adsorption treatment of the liquid to be treated containing Cu, Ni, Pb, Fe, and Sn can be satisfactorily operated by monitoring only Cu.

[0031]

As described above, according to the operation control method of the present invention, when the operation of the adsorption tower through which the liquid to be treated containing a plurality of substances to be removed flows is controlled, the leakage into the treatment liquid is prevented. By selecting the removal target substances that reach the upper limit concentration which is the earliest possible, by monitoring only the selected removal target substances, without monitoring other removal target substances,
The time to replace or regenerate the filler can be determined, and the water quality of the treatment liquid can be constantly maintained at a high level.

In addition, according to the operation management apparatus of the present invention, particularly when the selected removal target substance is a substance that can be continuously monitored, it can be easily monitored by an online monitoring apparatus or the like, and appropriate measures can be taken.

Therefore, as compared with the conventional method in which each substance to be removed is analyzed in a processing facility or an external analysis institution, not only can the water quality of the processing solution be guaranteed, but also the analysis equipment, labor, cost and time can be reduced. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic overall configuration of an adsorption tower operation management device according to an embodiment of the present invention.

FIG. 2 illustrates the principle of operation control of the adsorption tower of the present invention.
It is the graph which showed the relationship between the breakthrough curve of fluorine and arsenic, and a water quality standard value.

FIG. 3 is an explanatory diagram showing a schematic overall configuration of an operation management device for an adsorption tower according to another embodiment of the present invention.

[Explanation of symbols]

 1,2,3 Adsorption tower 5,6,7 Liquid supply piping 8,9,10 Inflow piping 11,12,13 Outflow piping 16 Fluorine concentration meter 17 Controller 21 Telemeter

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Yamamoto 2-47, Shikitsu Higashi 1-chome, Namiwa-ku, Osaka-shi, Osaka (72) Inventor Shintaro Nishimoto Higashi-ichi, Shichitsu, Naniwa-ku, Osaka, Osaka No.2-47 F-term in Kubota Corporation (Reference) 4D017 AA01 BA13 CA05 EA01 EB04 EB06 4D024 AA04 AA05 AB11 AB17 BA13 BA18 CA01 DA03 DA04 DA07

Claims (3)

[Claims] 1. An operation control method of an adsorption tower through which a liquid to be treated containing a plurality of substances to be removed is passed, wherein an upper limit concentration at which leakage into the processing liquid is allowed is set for each substance to be removed. Then, the removal target substance that reaches the set upper limit concentration value earliest is selected, and when the liquid to be treated is passed through the adsorption tower,
Monitor the concentration of the selected removal target substance in the processing liquid flowing out,
A method for managing the operation of an adsorption tower, wherein the filler in the adsorption tower is replaced or regenerated when the upper limit concentration value is reached. 2. An operation management device for performing the operation management method for an adsorption tower according to claim 1, wherein the liquid supply piping system communicates the plurality of adsorption towers in series with each other, and communicates with an inflow side of each adsorption tower. An inflow piping system, an outflow piping system communicating with the outflow side of each adsorption tower, a plurality of automatic valves interposed in each of the piping systems to form a flow path passing through a predetermined adsorption tower, and the outflow piping system A water quality monitoring device that monitors the concentration of the selected removal target substance in the treatment liquid derived by the above, stores an upper limit concentration value set for the selected removal target substance, and is connected to the automatic valve and the water quality monitoring device. Provided with a control device provided, by this control device, when the measured concentration value of the selected removal target substance in the water quality monitoring device reaches the upper limit concentration value, the automatic valve is opened and closed, the most upstream adsorption tower Configuration to form a separate flow path And an operation management device for the adsorption tower. 3. The operation management device for an adsorption tower according to claim 2, wherein the control device is provided with alarm means for issuing an alarm to the operation manager when the measured concentration value of the selected removal target substance reaches the upper limit concentration value. An operation management device for an adsorption tower.