CN112135683B - Diagnostic device for turbidity removing system - Google Patents

Diagnostic device for turbidity removing system Download PDF

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Publication number
CN112135683B
CN112135683B CN201980033628.2A CN201980033628A CN112135683B CN 112135683 B CN112135683 B CN 112135683B CN 201980033628 A CN201980033628 A CN 201980033628A CN 112135683 B CN112135683 B CN 112135683B
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turbidity
water
membrane
countermeasure
turbidity removing
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CN201980033628.2A
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CN112135683A (en
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龟田英邦
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Kurita Water Industries Ltd
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Kurita Water Industries Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/145—Ultrafiltration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
    • B01D65/109—Testing of membrane fouling or clogging, e.g. amount or affinity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/22—Controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Paper (AREA)

Abstract

A diagnostic device for a turbidity removal system, which is a diagnostic device for diagnosing the operating state of a turbidity removal system including a turbidity removal membrane device (5) for performing membrane filtration of water to be treated, wherein the diagnostic device for a turbidity removal system comprises: an input unit for operation state information of the turbidity removing system; a storage unit that stores data indicating a relationship between an operation failure state of the turbidity removing system and a countermeasure; and a determination unit that determines a countermeasure against malfunction of the turbidity removing membrane device based on the operating state information input by the input unit and the data stored in the storage unit.

Description

Diagnostic device for turbidity removing system
Technical Field
The present invention relates to a diagnostic apparatus for specifying a countermeasure against an operational failure of a turbidity removing system for performing a turbidity removing membrane treatment on water to be treated.
Background
Various water treatments are performed in water treatment using well water, industrial water, tap water, or the like as raw water, various drainage treatments, drainage recovery, and the like. For example, the following water treatment is performed: a flocculant is added to raw water to aggregate and coarsen suspended substances, colloidal components, organic substances, and the like in the raw water, and then solid-liquid separation is performed by precipitation, suspension, filtration, membrane filtration, or the like. The following water treatments were carried out: the treated water was recovered by performing turbidity removal/sterilization by membrane filtration alone.
The causes of membrane clogging in a membrane filtration apparatus include: (i) excessive turbidity of the water supply; or (ii) poor backwashing; (iii) if the treatment is performed before the turbidity removing film, the pretreatment is poor. As a countermeasure, the following operation can be performed.
In the case of (i), for example, the turbidity of the water supplied to the turbidity removing membrane is measured. When the turbidity is not less than the predetermined value, the water passage time is changed. Regarding (ii), for example, the amount of air bubbling (bubbling) is checked, and when the amount of bubbling is equal to or less than a predetermined amount of bubbling, the amount of bubbling is adjusted to be equal to or more than the predetermined amount of bubbling. In the case (iii), the addition concentration of the coagulant to be subjected to the pretreatment is adjusted to a predetermined addition concentration or higher when the addition concentration is equal to or lower than the predetermined addition concentration.
When the filtration resistance of the turbidity removing membrane increases, backwashing or cleaning with chemicals such as acid and alkali is performed (patent document 1 and the like).
Patent document 1: japanese patent laid-open No. 2004-58022.
The cause of clogging of the turbidity removing membrane includes many causes such as excessive turbidity of the feed water, a problem in operation of the turbidity removing membrane (such as incomplete backwashing), and a failure in pretreatment, and the countermeasure varies depending on the cause.
Disclosure of Invention
The purpose of the present invention is to provide a diagnostic device for an opacity system, which can accurately determine a countermeasure against an operational failure of the opacity system.
A diagnostic device for a turbidity removal system according to the present invention is a diagnostic device for diagnosing an operating state of a turbidity removal system including a turbidity removal membrane device for performing membrane filtration of water to be treated, the diagnostic device for a turbidity removal system including: an input unit for operation state information of the turbidity removing system; a storage unit that stores data indicating a relationship between an operation failure state of the turbidity removing system and a countermeasure; and a determination unit that determines a countermeasure against malfunction of the turbidity removing membrane device based on the operating state information input by the input unit and the data stored in the storage unit.
In one aspect of the present invention, the input unit includes a display unit that displays a plurality of questions and an input unit that inputs answers to the questions.
In one embodiment of the present invention, the turbidity removing membrane apparatus includes a coagulation treatment apparatus in a stage preceding the turbidity removing membrane apparatus.
In one embodiment of the present invention, the operation state information is at least one of Suspended Solids (SS) and pH of water supplied to the turbidity removing membrane device, a Membrane Fouling Factor (MFF) value of treated water, a backwash air pressure of the turbidity removing membrane device, a backwash water amount of the turbidity removing membrane device, and an addition amount of a coagulant in the coagulation processing device.
In one aspect of the present invention, the diagnosis is performed when a membrane pressure difference of the membrane filtration device is equal to or greater than a predetermined value or when a rate of increase of the membrane pressure difference is equal to or greater than a predetermined value.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the operating state of the turbidity removing system can be accurately diagnosed.
According to one aspect of the present invention, the cause of the abnormality of the turbidity removing system can be appropriately determined.
Drawings
FIG. 1 is a schematic diagram of a turbidity removing membrane system.
Fig. 2 is a configuration diagram of a diagnostic device of the turbidity removing membrane system.
Fig. 3 is a flowchart showing a diagnostic method of the turbidity removing membrane system.
Detailed Description
Fig. 1 is a configuration diagram of a turbidity removing system according to an embodiment. The raw water is subjected to coagulation treatment by the coagulation treatment apparatus 1, and then supplied to a turbidity removal membrane apparatus (in the above embodiment, an Ultrafiltration (UF) membrane module) 5 via a pump 2, a valve 3, and a pipe 4. The permeated water in the membrane 5a is taken out as treated water through a pipe 6 and a valve 7. The pipes 4 and 6 are provided with pressure sensors 8 and 9, respectively. A pH meter 19 is provided to measure the pH of the coagulation-treated water from the coagulation-treating apparatus 1.
Backwash air can be supplied to the secondary side of the membrane 5a through the pipe 10 and the valve 11 to backwash the membrane device 5 with air or water. Backwash water can be supplied through the pipe 12 and the valve 13. 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 pipe 10 is provided with a flow meter 14 and a pressure sensor 15. The backwash water pipe 12 is provided with a flow meter 16.
An air supply pipe for supplying air to the primary side of the membrane 5a to perform bubbling cleaning may be connected to the primary side.
During the normal membrane filtration operation, only the valves 3 and 6 are opened, and the other valves 11, 13, and 18 are closed. When backwashing is performed 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 pressures detected by the pressure sensor 8 and the pressure sensor 9 are input to a differential pressure detection circuit 20, and the difference between the two is calculated as a membrane differential pressure. When the differential pressure is too large (not less than a predetermined value a) or the rising speed of the differential pressure is too large (not less than a predetermined value b), a signal is transmitted to an alarm (alarm) circuit 21 to generate an alarm by sound and/or light, and a signal is transmitted to a diagnostic device 30 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 (touch switch) function. The main body 31 includes a data collection unit 32, a data storage unit 33, a database (storage unit) 34, and a determination unit 35.
The main body 31 is a computer including a Central Processing Unit (CPU), a flash Memory (flash Memory), a Read Only Memory (ROM), a Random Access Memory (RAM), a hard disk, and the like.
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 31 executing the management program.
The data collection unit 32 receives not only the differential pressure data but also the response data of the data classified by the diagnosis items from the display panel 36. The data storage unit 33 stores the response data and the determination result described later together with the operation data such as the differential pressure. The database 34 stores data indicating the relationship between the malfunction state of the turbidity removing system and the countermeasure against the malfunction state.
The determination unit 35 determines a countermeasure 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 the countermeasure on the display panel 36.
As shown in fig. 3, when the differential pressure or the differential pressure increase rate of the turbidity removing membrane device 5 is equal to or higher than a predetermined value, the alarm is activated, and a plurality of questions Q1 to Qn are displayed on the display panel 36, for example, as follows. Further, 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 the answer switch N also have an illumination function, and become a bright color when touched once and a dark color when touched again. Y, N, the highlighted one represents the selected answer. The reply operation is performed by the person in charge of operation of the turbidity removing membrane system or the like. Further, it is also possible to display an alarm switch on the display panel 36 in association with the alarm operation, and to display a question or the like when the operation person in charge touches the alarm switch.
Q1: is the SS concentration of UF feed water delta < delta > mg/L?
Q2: the air back-cleaning pressure is delta MPa- □ □ MPa?
Q3: air bubble amount (diffuser) Δ NL/min/module- □ □ NL/min/module?
Q4: air bubble amount (water duct) Δ NL/min/module- □ □ NL/min/module?
Q5: is the water backwash volume the same as the filtration flow?
Q6: Δ - □ □?
Q7: the amount of the coagulant added was Δ to □ □?
Δ, □ □ indicate specific numbers. These question sentences are one example, and further, other question sentences may also be displayed.
After all the questions are answered by touching the switch Y or the switch N, an input (enter, end) switch indicating the end of the answer is touched. In this way, the response data is transmitted from the display panel 36 to the data collection unit 32.
When the answer to Q1 is No (No, N), the determination unit 35 reads out the following measures a1 to A3 from the database 34 and displays them on the display panel 36.
A1: the backwashing conditions were confirmed and the backwashing frequency was changed.
A2: confirmation/reconsideration of agglutination conditions.
A3: (case of alarm not disappearing after three days) chemical clean.
When at least one of the answers Q2 to Q5 is No (No, N), the following countermeasures B1 and B2 are read from the database 34 and displayed on the display panel 36.
B1: the backwash conditions were improved.
B2: (case of alarm not disappearing after three days) chemical clean.
When at least one of the answers Q6, Q7 is No (No, N), C1, C2 are displayed as follows.
C1: confirmation/reconsideration of agglutination conditions was performed.
C2: and (5) carrying out chemical cleaning on the turbidity removal membrane device.
When the answer is Yes (Yes, Y) for any one of the answers Q1 to Q7, the data is read from the database 34 and displayed as follows. "the possibility of the quality of raw water being changed is high, and therefore, the contact with the management department should be considered again about the coagulation conditions. "
In this way, when a malfunction occurs in the turbidity removing membrane system, an effective measure can be taken against the fire speed.
The raw water is exemplified by tap water, industrial water, well water, and all drainage water, although the present invention is not particularly limited.
The coagulant or coagulation aid used in the coagulation treatment is not particularly limited, but an iron-based coagulant is preferably used.
When an iron-based coagulant is used, the pH is preferably 4.5 to 7.0, and particularly preferably 5.0 to 6.0. If the pH is too low, there is a risk of membrane clogging due to iron leakage. If the pH is too high, aggregation may be poor.
An oxidizing agent (usually sodium hypochlorite) is preferably added to the raw water. The addition amount is preferably 0.3mg/L (as Cl)2Standard) to 1.0mg/L (in Cl)2As a standard).
The turbidity removing membrane device 5 may be a device of a cross flow (cross flow) system or a device of a total volume filtration system.
The treatment process performed by the turbidity removal membrane device 5 includes water passing, air bubbling, backwashing, and water filling. The water filtering and passing time is 20-40 minutes. The initial pressure difference (inlet pressure-outlet pressure) was about 0.02MPa to 0.05 MPa. When the differential pressure is 0.07MPa to 0.10MPa, it is preferable to perform stationary cleaning. The material of the membrane is preferably Polyvinylidene Fluoride (PVDF) because of its good chemical resistance. The pore diameter is preferably 0.01 to 0.5. mu.m.
A Reverse Osmosis (RO) apparatus or an ion exchange column may be provided at the rear stage of the membrane apparatus 5.
In the present invention, the diagnosis may be performed when the membrane pressure difference reaches a predetermined value (for example, 80kPa), and the rate of increase in membrane pressure difference becomes a predetermined value (for example, 1.0 kPa/day (day), or 20 kPa/week (week)).
In the present invention, when the membrane differential pressure reaches a predetermined value (for example, 80kPa), but the rate of increase of the membrane differential pressure is a predetermined value (for example, 1.0 kPa/day (day), or 20 kPa/week (week)) or less, the above-described diagnosis may be omitted, and when the differential pressure does not decrease even when the chemical cleaning is performed, a countermeasure for replacing the membrane may be displayed.
In the present invention, when relatively clear water such as city water is used as raw water (water to be treated), the flocculation treatment apparatus can be omitted.
While the present invention has been described in detail with reference to the specific embodiments, those skilled in the art will appreciate that various modifications can be made without departing from the spirit and scope of the invention.
The present application is based on Japanese patent application 2018-97217 filed on 5/21/2018, the entire content of which is incorporated by reference.
Description of reference numerals
1: a coagulation treatment device; 5: a turbidity removal membrane device; 30: a diagnostic device; 36: a display panel.

Claims (1)

1. A diagnostic device for diagnosing the operating state of a turbidity removal system including an agglutination treatment device for performing an agglutination treatment on water to be treated and a turbidity removal membrane device for performing membrane filtration on the agglutination treatment water from the agglutination treatment device,
the diagnostic device for an impurity removal system includes:
an input unit for operation state information of the turbidity removing system;
a storage unit that stores data indicating a relationship between an operation failure state of the turbidity removing system and a countermeasure;
a countermeasure determination unit that determines an abnormal operation state to be generated based on the operation state information input from the input unit and the data stored in the storage unit when the film pressure difference of the turbidity removing membrane device is equal to or greater than a predetermined value or when the rising speed of the film pressure difference is equal to or greater than a predetermined value, and determines a countermeasure against the abnormal operation of the turbidity removing membrane device; and
a countermeasure display section for displaying the determined countermeasures,
the input unit includes a question display means for displaying a plurality of questions and an answer input means for inputting answers to the questions,
the operation state information is at least one of suspended solids and pH of the feed water to the turbidity removal membrane device, a membrane fouling coefficient value of the treated water, backwash air pressure of the turbidity removal membrane device, backwash water amount of the turbidity removal membrane device, air bubbling amount, and addition amount of the coagulant to the coagulation treatment device.
CN201980033628.2A 2018-05-21 2019-05-07 Diagnostic device for turbidity removing system Active CN112135683B (en)

Applications Claiming Priority (3)

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JP2018-097217 2018-05-21
JP2018097217A JP6614277B2 (en) 2018-05-21 2018-05-21 Diagnostic device for turbidity system
PCT/JP2019/018249 WO2019225307A1 (en) 2018-05-21 2019-05-07 Clarification system diagnostic device

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CN112135683B true CN112135683B (en) 2021-12-03

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KR102477966B1 (en) 2022-12-14
CN112135683A (en) 2020-12-25
JP2019202242A (en) 2019-11-28
KR20210011367A (en) 2021-02-01
TW202003099A (en) 2020-01-16
JP6614277B2 (en) 2019-12-04
WO2019225307A1 (en) 2019-11-28

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