TW202003099A - Clarification system diagnostic device - Google Patents

Abstract

A clarification system diagnostic device, which is a diagnostic device for diagnosing an operational state of a clarification system including a clarification membrane device 5 for subjecting water being treated to membrane filtration, includes: an input unit for inputting operational state information relating to the clarification system; a storage unit for storing data representing a relationship between an operational failure state of the clarification system and a countermeasure; and a determining unit for determining a countermeasure to the operational failure of the clarification membrane device on the basis of the operational state information input into the input unit, and the data stored in the storage unit.

Description

Diagnosis device of turbidity removal system

The present invention relates to a diagnostic device for determining countermeasures against malfunction of a turbidity removal system that performs turbidity removal film treatment on water to be treated.

Various water treatments are carried out in water treatment using well water, industrial water, tap water, etc. as raw water, or various drainage treatments, drainage recovery, etc. For example, water treatment is performed by adding a flocculant to the raw water to coagulate and coarsen suspended substances, colloidal components, organic substances, and the like in the raw water, and then perform solid-liquid separation by precipitation, suspension, filtration, membrane filtration, and the like. Water treatment is performed as follows: turbidity and sterilization are performed by membrane filtration alone to recover treated water.

Examples of the cause of the membrane clogging of the membrane filtration device include: (i) too much turbidity in the water supply; or (ii) poor backwashing; (iii) poor pretreatment when there is treatment before removing the turbid membrane. As a countermeasure, the following operations can be performed.

Regarding (i), for example, the turbidity of the water supply for removing the turbidity film is measured. When the turbidity is higher than or equal to the prescribed turbidity, the water flow time should be changed. Regarding (ii), for example, the amount of air bubbling is confirmed, and when it is equal to or less than the predetermined bubbling amount, it is adjusted to be equal to or greater than the predetermined bubbling amount. Regarding (iii), the additive concentration of the pre-treated coagulant is confirmed, and when it is equal to or less than the specified additive concentration, it is adjusted to be equal to or more than the specified additive concentration.

When the filtration resistance of the turbidity removal membrane increases, backwashing or cleaning with chemicals such as acid and alkali is performed (Patent Document 1 etc.).

[Patent Document 1] Japanese Patent Laid-Open No. 2004-58022

As the cause of clogging of the turbidity removal membrane, there are many reasons such as too much turbidity in the water supply, problems in the operation of the turbidity removal membrane (incomplete backwashing, etc.), and poor pretreatment. The response strategies vary according to the reasons, so accurate judgment is required. Reasons to quickly and appropriately establish coping strategies.

An object of the present invention is to provide a diagnostic device for a turbidity removal system, which can accurately determine a countermeasure against malfunction of the turbidity removal system.

The diagnostic device of the turbidity removal system of the present invention is a diagnostic device for diagnosing the operating state of the turbidity removal system. The turbidity removal system includes a turbidity removal membrane device that performs membrane filtration on the water to be treated. Including: an input part of the operation state information of the turbidity removal system; a storage part, which stores data indicating the relationship between the operation abnormal state of the turbidity removal system and countermeasures; and a determination part, based on the operation state input by the input part The information and the data stored in the storage unit determine a countermeasure against malfunction of the turbid film removal device.

In one aspect of the invention, the input unit includes a display element that displays a plurality of questions and an input element that answers the questions.

In one aspect of the present invention, the coagulation treatment device is included in the front stage of the turbidity removal film device.

In one aspect of the present invention, the operating state information is suspended solids (SS) and acid-base value (pH) of the water supply of the turbidity removal membrane device, and membrane fouling factor (MFF) of the treated water ) Value, at least one of the backwash air pressure of the turbidity removal membrane device, the backwash water amount of the turbidity removal membrane device, and the added amount of the coagulant of the coagulation treatment device.

In one aspect of the present invention, the diagnosis is performed when the membrane differential pressure of the turbidity removal membrane device is greater than or equal to a predetermined value, or when the rate of increase of the membrane differential pressure is greater than or equal to a predetermined value. [Effect of invention]

According to the present invention, the operation state of the turbidity removal system can be accurately diagnosed.

According to one aspect of the present invention, the cause of abnormality of the deturbid system can be appropriately determined.

FIG. 1 is a configuration diagram of a turbidity removal system according to an embodiment. The raw water is coagulated by the coagulation treatment device 1 and then supplied to the turbidity removal membrane device (Ultra Filtration (UF) membrane module in the above-described embodiment) 5 via the pump 2, the valve 3, and the piping 4. The permeated water of the membrane 5a is taken out as treated water through the pipe 6 and the valve 7. The piping 4 and the piping 6 are provided with a pressure sensor 8 and a pressure sensor 9, respectively. A pH meter 19 is provided to measure the pH of the coagulation treatment water from the coagulation treatment device 1.

The air for backwashing can be supplied to the secondary side of the membrane 5a via the backwashing air piping 10 and the valve 11, so that the turbidity removing membrane device 5 can be backwashed with air or water. The backwash water can be supplied via the backwash water pipe 12 and the valve 13. The air or water permeating the membrane 5a from the secondary side to the primary side can be discharged from the primary side of the membrane 5a through the backwash fluid discharge pipe 17 and the discharge valve 18. The backwash air piping 10 is provided with a flow meter 14 and a pressure sensor 15. A flowmeter 16 is provided in the backwash water pipe 12.

Air supply piping may be connected to the primary side, and the air supply piping supplies air to the primary side of the membrane 5a for bubbling cleaning.

When performing a normal membrane filtration operation, only the valves 3 and 6 are opened, and the other valves 11, 13 and 18 are closed. When performing backwashing with air or water, the valves 3 and 7 are closed, one or both of the valves 11 and 13 are opened, and the discharge valve 18 is opened.

The detection pressures of the pressure sensor 8 and the pressure sensor 9 are input to the differential pressure detection circuit 20, and the difference between the two is calculated as the membrane differential pressure. When the differential pressure is too large (above the prescribed value a) or the rising speed of the differential pressure is too large (above the prescribed value b), a signal is sent to the alarm circuit 21 to generate an alarm by sound and/or light, and The diagnosis device 30 is sent a signal to perform diagnosis.

As shown in FIG. 2, the diagnostic device 30 includes a main body 31 and a liquid crystal display panel 36 as an input unit having a touch switch function. The main body section 31 includes a data collection section 32, a data storage section 33, a database (storage section) 34, and a determination section 35.

The main body 31 includes a central processing unit (CPU) (central processing unit), flash memory, flash memory, read only memory (ROM), and random access memory (random access memory) Access memory (RAM), hard disk and other computers.

The functions of the data collection unit 32, the data storage unit 33, the database 34, and the determination unit 35 are realized by the CPU of the main body unit 31 executing the management program.

In addition to the differential pressure data, the data collection unit 32 also receives the answer data of the data classified by the diagnosis item from the display panel 36. The data storage unit 33 stores the response data and the determination result described later together with the operating data such as differential pressure. The database 34 stores data indicating the relationship between the malfunction state of the deturbid system and the countermeasures against the malfunction state.

The determination unit 35 determines the countermeasures based on the response data from the display panel 36 collected by the data collection unit 32 and the relationship data of the database 34 and displays them on the display panel 36.

As shown in FIG. 3, when the differential pressure or the differential pressure rising speed of the turbidity removing device 5 is greater than or equal to a predetermined value, an alarm is activated, and the display panel 36 displays, for example, a plurality of questions Q1 to Q as follows Qn. In addition, a yes (Yes) answer switch Y and a no (No) answer switch N are displayed adjacent to the right side of each question. The answer switch Y and answer switch N also have a lighting function, which becomes bright when touched once, and becomes dark when touched again. The brighter color among Y and N indicates the selected answer. The answering operation is performed by the person in charge of the operation of the turbidity removal film system. In addition, it is also possible to display an alarm switch on the display panel 36 along with an alarm operation, and to display a question or the like when the person in charge of operation or the like touches the alarm switch. Q1: Is the SS concentration of UF water supply below △△ mg/L? Q2: Is the air backwashing pressure △△ MPa～□□ MPa? Q3: The amount of air bubbling (diffuser) △△ NL/min/module～□□ NL/min/module? Q4: Air bubbling volume (water pipe) △△ NL/min/module～□□ NL/min/module? Q5: The amount of water backwashing is the same as that of filtered water? Q6: Is the pH of UF water supply △△～□□? Q7: Is the addition amount of coagulant △△～□□?

△△, □□ indicate specific figures. These questions are examples, and other questions can also be displayed.

After answering all questions by touching switch Y or switch N, touch the input (enter, Ent) switch indicating the end of the answer. As a result, the answer materials are sent from the display panel 36 to the data collection unit 32.

When the answer of Q1 is No (No, N), the determination unit 35 reads the following countermeasures A1 to A3 from the database 34 and displays them on the display panel 36. A1: Confirm the backwash conditions and change the backwash frequency. A2: Confirmation/reconsideration of agglutination conditions. A3: (when the alarm does not disappear after three days) Chemical cleaning.

When the answer of at least one of Q2 to Q5 is No (No, N), the following countermeasure B1 and countermeasure B2 are read out from the database 34 and displayed on the display panel 36. B1: Improve the backwash conditions. B2: (when the alarm does not disappear after three days) Chemical cleaning.

When the answer of at least one of Q6 and Q7 is No (No, N), the following displays of C1 and C2 are performed. C1: Confirmation/reconsideration of agglutination conditions. C2: Chemical cleaning of the turbidity removal device.

When the answer to any of Q1 to Q7 is yes (Yes, Y), it is read from the database 34 and displayed as shown below. "There is a high possibility that the quality of the raw water will change, so please contact the management department to reconsider the conditions of agglutination." In this way, effective countermeasures can be taken in case of abnormality in the turbidity removal film system.

Although the present invention is not particularly limited, tap water, industrial water, well water, and all drainage can be exemplified as raw water.

The coagulant and coagulation aid used in the coagulation treatment are not particularly limited, but it is desirable to use an iron-based coagulant.

When an iron-based coagulant is used, it is preferably pH 4.5 to pH 7.0, and particularly preferably pH 5.0 to pH 6.0. If the pH is too low, there is a risk of clogging the membrane due to iron leakage. If the pH is too high, there is a possibility of poor aggregation.

In raw water, it is preferable to add an oxidizing agent (usually sodium hypochlorite). The added amount is preferably about 0.3 mg/LasCl ₂ to 1.0 mg/LasCl ₂ .

The turbidity removal device 5 may be a crossflow type device or a total filtration type device.

The processing steps performed by the turbidity removing device 5 include the steps of water passing, air bubbling, backwashing, and water filling. Filtration time is 20 minutes to 40 minutes. The initial differential pressure (inlet pressure-outlet pressure) is operated at about 0.02 MPa to 0.05 MPa. When the differential pressure is 0.07 MPa to 0.10 MPa, it is preferable to perform fixed cleaning. The material of the membrane is polyvinylidene fluoride (Polyvinylidene Fluoride, PVDF), which has good and good chemical resistance. The pore diameter is preferably 0.01 μm to 0.5 μm.

A reverse osmosis (RO) device or ion exchange tower may also be provided in the rear stage of the turbidity removal device 5.

In the present invention, it can also be set that when the membrane differential pressure reaches a prescribed value (for example, 80 kPa), and the rising speed of the membrane differential pressure is a prescribed value (for example, 1.0 kPa/day (day), or 20 kPa/week (week )) In the above, the diagnosis is performed.

In the present invention, it can also be set that when the membrane differential pressure reaches a prescribed value (for example, 80 kPa), the rate of rise of the membrane differential pressure is a prescribed value (for example, 1.0 kPa/day (day), or 20 kPa/week (week )) In the following cases, the above-mentioned diagnosis is not performed, and the turbidity removal membrane is cleaned with chemicals. If the differential pressure does not drop even if the chemicals are cleaned, a countermeasure for membrane replacement is indicated.

In the present invention, when relatively clarified water such as urban water supply is used as raw water (treated water), the agglutination treatment device may be omitted.

The present invention will be described in detail using a specific form, but those of ordinary skill in the art will recognize that various changes can be made without departing from the intention and scope of the present invention. This application is based on the Japanese patent application 2018-97217 filed on May 21, 2018, the entire contents of which are cited by reference.

1‧‧‧Agglutination treatment device 2‧‧‧Pump 3. 7, 11, 13, ‧‧‧ valve 4, 6‧‧‧ piping 5‧‧‧ Turbidity removal device 5a‧‧‧membrane 8, 9, 15‧‧‧‧ pressure sensor 10‧‧‧Backwash air piping 12‧‧‧Backwash water piping 14.16‧‧‧Flowmeter 17‧‧‧Backwash fluid discharge piping 18‧‧‧Discharge valve 19‧‧‧pH meter 20‧‧‧Differential pressure detection circuit 21‧‧‧Alarm circuit 30‧‧‧Diagnostic device 31‧‧‧Body 32‧‧‧Data Collection Department 33‧‧‧ Data Preservation Department 34‧‧‧ Database (Storage Department) 35‧‧‧Judgment Department 36‧‧‧Display panel

FIG. 1 is a configuration diagram of a turbidity removal film system. FIG. 2 is a configuration diagram of a diagnostic device of a turbidity removal system. Fig. 3 is a flowchart showing a method for diagnosing a turbidity removal film system.

1‧‧‧Agglutination treatment device

2‧‧‧Pump

3. 7, 11, 13, ‧‧‧ valve

4, 6‧‧‧ piping

5‧‧‧ Turbidity removal device

5a‧‧‧membrane

8, 9, 15‧‧‧‧ pressure sensor

10‧‧‧Backwash air piping

12‧‧‧Backwash water piping

14.16‧‧‧Flowmeter

17‧‧‧Backwash fluid discharge piping

18‧‧‧Discharge valve

19‧‧‧pH meter

20‧‧‧Differential pressure detection circuit

21‧‧‧Alarm circuit

30‧‧‧Diagnostic device

Claims (5)

A diagnostic device for a turbidity removal system for diagnosing the operating state of a turbidity removal system. The turbidity removal system includes a turbidity removal membrane device that performs membrane filtration on treated water. The diagnostic device for the turbidity removal system includes: The input part of the operation state information of the turbid removal system; The storage unit stores data indicating the relationship between the malfunction state of the turbidity removal system and the countermeasures; and The determination unit determines a countermeasure against malfunction of the turbid film removal device based on the operation state information input from the input unit and the data stored in the storage unit. The diagnostic device of the turbidity removal system according to item 1 of the patent application, wherein the input unit includes a display element that displays a plurality of questions and an input element that answers the questions. The diagnostic device of the turbidity removal system as described in item 1 or 2 of the patent application scope, wherein an coagulation treatment device is included in the front stage of the turbidity removal film device. The diagnostic device of the turbidity removal system as described in any one of the first to third patent application scopes, wherein the operating state information is for suspended solids and pH value of the water supply of the turbidity removal membrane device, and for the treatment of water At least one of the value of the membrane fouling coefficient, the backwash air pressure of the turbidity removing membrane device, the amount of backwash water of the turbidity removing membrane device, and the added amount of the coagulant of the coagulation treatment device. The diagnostic device for a turbidity removal system according to any one of the first to fourth patent application ranges, wherein, when the membrane differential pressure of the turbidity removal membrane device is equal to or greater than a prescribed value, or when the membrane differential pressure When the ascent speed is higher than a predetermined value, the diagnosis is performed.

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