CN112165984B

CN112165984B - Diagnostic device for reverse osmosis system

Info

Publication number: CN112165984B
Application number: CN201980033804.2A
Authority: CN
Inventors: 龟田英邦
Original assignee: Kurita Water Industries Ltd
Current assignee: Kurita Water Industries Ltd
Priority date: 2018-05-21
Filing date: 2019-05-07
Publication date: 2021-11-12
Anticipated expiration: 2039-05-07
Also published as: TW202003094A; KR20210011368A; CN112165984A; KR102462859B1

Abstract

A diagnostic device for a reverse osmosis system, which is a diagnostic device for diagnosing the operating state of an RO system comprising a pretreatment device (1) and an RO device (5) for performing membrane filtration on flocculated treated water from the pretreatment device (1), wherein the diagnostic device for a reverse osmosis system comprises: a receiving unit for receiving flux data of the RO device (5); an input unit for operating state information of the RO system; a storage unit that stores data indicating a relationship between an abnormal operation state of the RO system and a countermeasure; and a determination unit (35) that determines a countermeasure against malfunction of the RO device, based on the operating state information input by the input unit and the data stored in the storage unit.

Description

Diagnostic device for reverse osmosis system

Technical Field

The present invention relates to a diagnostic device for specifying a countermeasure against an operational failure of a reverse osmosis system in which Reverse Osmosis (RO) treatment is performed after turbidity removal membrane treatment is performed on flocculated water.

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, 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 water treatment is performed by performing solid-liquid separation by precipitation, suspension, filtration, membrane filtration, and the like. Water treatment is performed to recover treated water by performing turbidity removal/sterilization by membrane filtration alone.

Generally, membrane clogging causes of RO membranes include: (i) excessive turbidity of the water supply; (ii) adhesion of scale (scale) and slime (slime); (iii) if there is a pretreatment, the pretreatment is poor. As a countermeasure, the following operation can be performed.

Regarding (i), for example, a Sludge Density Index (SDI) of the RO feed water is measured. When the SDI is equal to or higher than the predetermined SDI, the processing is dealt with by changing the preprocessing conditions. In the (ii), for example, the water quality of the RO feed water, the RO treated water and the RO concentrated water is measured, and the recovery rate is optimized. In the case (iii) where the addition concentration of the coagulant to be subjected to the pretreatment is equal to or higher than the allowable addition concentration, the addition concentration is adjusted to be equal to or lower than the allowable addition concentration.

When the filtration resistance of the RO membrane increases, backwashing or cleaning with chemicals such as acid and alkali is performed (patent document 1 and the like).

When the RO membrane is aged, the flux may increase beyond a predetermined range.

Patent document 1: japanese patent laid-open publication No. 2016-185520.

The cause of clogging of the RO membrane includes many causes such as excessive turbidity of the feed water, adhesion of scale and slime, and failure of 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 a reverse osmosis system, which is capable of accurately determining a countermeasure against an operational failure of a Reverse Osmosis (RO) system.

A diagnostic device for a reverse osmosis system according to the present invention is a diagnostic device for diagnosing an operating state of a reverse osmosis system including a pretreatment device and a reverse osmosis device for performing reverse osmosis treatment on pretreatment water from the pretreatment device, the diagnostic device for the reverse osmosis system including: a receiving unit for receiving at least one of index data relating to permeability of the reverse osmosis device and a primary-side flow path pressure difference; an input unit for operation state information of the reverse osmosis system; a storage unit that stores data indicating a relationship between an abnormal operation state of the reverse osmosis system and a countermeasure; and a determination unit that determines a countermeasure against malfunction of the reverse osmosis apparatus 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 for displaying a plurality of questions and an input unit for answering the questions.

In one aspect of the present invention, the operation state information includes a ratio of a Sludge Density Index (SDI) value of the feed water to the concentrate water of the reverse osmosis apparatus.

In one aspect of the present invention, the operation state information includes an SDI value of the supply water to the reverse osmosis apparatus.

In one aspect of the present invention, the pretreatment apparatus includes an aggregation treatment apparatus and a filtration membrane apparatus for aggregating treated water, and the operation state information further includes an SDI value of filtered water of the filtration membrane apparatus.

In one aspect of the present invention, the operation state information includes a concentration ratio of a non-precipitating standard substance and a concentration ratio of a scale-forming substance in the reverse osmosis apparatus.

In one aspect of the present invention, the operation state information includes conductivity of the feed water and permeate water to the reverse osmosis device, free chlorine concentration of the reverse osmosis feed water, and Oxidation-Reduction Potential (ORP) of the reverse osmosis feed water.

In one aspect of the present invention, the receiving unit is a unit that receives index data relating to permeability of a reverse osmosis apparatus, and the index data relating to permeability is a correction flux.

In one aspect of the present invention, the determination unit performs the diagnosis when the correction flux of the reverse osmosis apparatus falls outside a predetermined range or when a rate of decrease of the correction flux falls to a predetermined value or more.

In one aspect of the present invention, the receiving unit is a member that receives a primary-side flow path differential pressure of the reverse osmosis membrane device, and the diagnosis is performed when the primary-side flow path differential pressure of the reverse osmosis membrane device is equal to or greater than a predetermined value or when a rate of increase of the membrane differential pressure is equal to or greater than a predetermined value.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the operating state of the RO system can be diagnosed accurately.

According to an aspect of the present invention, the cause of the malfunction of the RO system can be appropriately determined.

Drawings

Fig. 1 is a configuration diagram of an RO system.

Fig. 2 is a configuration diagram of a diagnostic device of the RO system.

Fig. 3 is a flowchart showing a diagnostic method for an RO system.

FIG. 4 is a schematic diagram of a pretreatment apparatus.

Fig. 5 is a configuration diagram of an RO system.

Fig. 6 is a configuration diagram of a diagnostic device of the RO system.

Fig. 7 is a flowchart showing a diagnostic method for an RO system.

Detailed Description

In the present invention, the index data relating to permeability refers to index data relating to the permeability of the water to be treated in the reverse osmosis membrane, and usually, a permeate (flux) or a permeate flow rate can be used. In the reverse osmosis treatment, constant flow filtration in which the amount of treated water (the amount of permeated water) is fixed is often used, and in this case, the operating pressure, the average operating pressure, the pressure difference between membranes, and the effective pressure can be used as index data relating to the permeability.

The flux and the permeate flow rate differ depending on the temperature or the pressure difference between membranes, and therefore, it is preferable to use the corrected flux or the corrected permeate flow rate converted into the standard pressure difference between membranes or the standard temperature condition as the index data relating to the permeability.

The permeate flow, permeate flow rate, operating pressure, average operating pressure, pressure difference between membranes, effective pressure, and corrected flux were defined as Japanese Industrial Standard (JIS) K3802: 2015 (film term), as described below.

Permeate stream (flux): the amount of water per unit time that permeates a unit membrane area.

Permeate flow rate: the amount of water that permeates the membrane per unit time.

Operating pressure (operating pressure): the pressurized module delivers the supply water to the pressure in front of the device.

Average operating pressure (average operating pressure): in the pressurizing type module, the pressure (P) of the supplied water is shown in the following formula (1)_in) And the pressure of the condensed water (P)_out) Pressure (P) at which averaging is carried out₀). Without subtracting the secondary side pressure (P), unlike the pressure difference between membranes_prod)。

P₀＝(P_in+ P_out) /2 transmembrane pressure difference (1)

Transmembrane pressure difference (trans membrane pressure): difference between primary and secondary pressures of the film, element or module. Further, in the cross flow (cross flow) filtration, the average operating pressure is generally used as the primary side pressure.

Effective pressure (effective pressure): in a pressurized type module, the operating pressure (P) is self-averaged₀) Minus osmotic pressure difference (Δ π) and secondary pressure (P)_prod) Effective pressure on the membrane.

Corrected flux (corrected flux): the flux was converted into a flux obtained under a standard pressure difference between membranes and a standard temperature.

Hereinafter, an example of using the correction flux as the index data relating to the permeability will be described.

Fig. 1 is a configuration diagram of an RO system according to an embodiment. The raw water is subjected to coagulation treatment and filtration treatment in the pretreatment apparatus 1, and then supplied to the RO apparatus 5 through the pump 2, the valve 3, and the pipe 4. In the above embodiment, as the pretreatment apparatus 1, as shown in fig. 4, an apparatus including: a coagulation processing device 1 a; a filter device 1b for filtering the coagulation treatment water; and a relay tank 1d for storing the filtered water, but the present invention is not limited thereto. Reference numeral 1c denotes a pipe for flowing filtered water into the

relay tank

1d, and 1e denotes a pipe for flowing filtered water from the relay tank 1d to the pump 2. The pipe 1e is provided with a pH meter 19, a conductivity meter 23, an ORP meter 24, and a free chlorine meter 25, and detection data of these are input to a diagnostic device 30 described later.

The filtration device 1b is preferably a gravity filter, a pressure filter, a Microfiltration (MF) membrane module, an Ultrafiltration (UF) membrane module, or the like, and in the above embodiment, a hollow fiber UF membrane module is used.

The permeate of the RO membrane 5a of the RO apparatus 5 is taken out as treated water through the pipe 6 and the valve 7, and the raw water that has not permeated the RO membrane 5a is taken out as concentrated water through the pipe 17 and the valve 18. The

pipes

4, 6, and 17 are provided with a pressure sensor 8, a pressure sensor 9, and a pressure sensor 27, respectively. The pipe 6 is further provided with a flowmeter 9A, a thermometer 9B, and an electrical conductivity meter 26. The pipe 17 is provided with a flowmeter 27A and a conductivity meter 28. The detection values of the flow meter 9A, the pressure sensor 8, the pressure sensor 9, the pressure sensor 27, and the thermometer 9B are input to the arithmetic circuit 20, and the correction flux (correction flux bundle) is calculated. The pressures detected by the pressure sensor 8 and the pressure sensor 27 are input to the arithmetic circuit 20, and the difference between the two is calculated as a primary-side flow path differential pressure.

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 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 the correction flux and the primary-side channel pressure difference data from the arithmetic circuit 20, and also receives the response data of the diagnostic item type data from the display panel 36, in addition to the data of the

conductivity meters

23, 26, and 28, the ORP meter 24, the free chlorine meter 25, the pH meter 19, and the thermometer 9B. The data storage unit 33 stores the response data and the determination result described later together with operation data such as the correction flux, the primary-side flow path differential pressure, the electrical conductivity, the ORP, the free chlorine, and the pH. The database 34 stores data indicating an abnormal operation state of the RO system and a countermeasure against the abnormal operation state.

The determination unit 35 determines a countermeasure based on the data collected by the data collection unit 32 and the countermeasure data in the database 34, and displays the countermeasure on the display panel 36.

As shown in fig. 3, when the corrected flux of the RO device 5 is out of the predetermined range or when the rate of decrease of the corrected flux is equal to or higher than a predetermined value, the alarm is activated and, for example, a plurality of question letters Q1 to Q6 as follows are displayed on the display panel 36. Further, whether the answer switch Y is Yes or not (No) is displayed adjacent to the right side of each question text. The answer switches Y and N each have an illumination function of changing to a light color when touched once and changing to a dark color when touched again. Y, N, the bright glowing person indicates the selected response. The reply operation is performed by the operation person in charge of the RO system or the like.

The UV260 of Q3 described below is an organic substance measured by ultraviolet absorptiometry at a wavelength of 260 nm. The removal rate of the conductivity of Q7 is shown in the following formula.

[ number 1]

Q1: is SDI of RO concentrate less than 3?

Q2: na concentration magnification < (TOC concentration magnification + α)?

Q3: na concentration magnification < (UV260 concentration magnification + β)?

Q4: na concentration magnification < (Si concentration magnification + γ)?

Q5: na concentration magnification < (Ca concentration magnification + δ)?

Q6: na concentration magnification < (Mg concentration magnification + epsilon)?

Q7: a removal rate of electric conductivity?

Q8: concentration of free chlorine in RO feed water<Eta mg/L (in Cl)₂Is the standard)?

Q9: OPR < θ mV for RO feed water?

α, β, γ, δ, ε, ζ, η, and θ represent specific numbers. The question words are an example, and other question words may be further displayed.

When all the question letters 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 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.

a 1: the amount of the viscosity control agent (slime control agent) added was increased.

a 2: and carrying out chemical cleaning.

a 3: (in the case of no recovery of performance) membrane replacement was performed.

When at least one of the responses Q2 and Q3 is N, the following measures b1 to b3 are read from the database 34 and displayed on the display panel 36.

b 1: the agglutination conditions were re-evaluated.

b 2: and carrying out chemical cleaning.

b 3: (in the case of no recovery of performance) membrane replacement was performed.

When at least one of the responses Q4 to Q6 is N, it is determined that scale is attached, and the following displays of c1 and c2 are performed.

c 1: the pH of the RO feed water was re-evaluated and the amount of scale dispersant added was doubled (the strategy for coping was different depending on the type of scale and, therefore, communicated to the regulatory authorities).

c 2: and (5) carrying out chemical cleaning on the RO device.

In the Q2 to Q6, other non-precipitating substances such as K and Cl may be used instead of Na. In Q4 to Q6, other scale-forming substances such as Ba and Sr may be used instead of Si, Ca and Mg.

When the answer of at least one of Q7 to Q9 is N, d1 and d2 are displayed as follows.

d 1: the film having the conductivity removal rate of less than 98% was replaced by a container (vessel) inspection.

d 2: free chlorine (as Cl) was detected at 0.1mg/L in the RO feed water₂Standard) or more, or ORP (oxidation reduction potential) of 450mV or more, the concentration of the reducing agent added to the RO water supply is increased.

When all the responses to Q1 to Q9 are Y, the data is read from the database 34 and displayed as follows. "because a detailed water quality analysis is required, please contact the management department. "

Further, as the question, "is it possible to add" is the correction flux not recovered even if the chemical cleaning is performed? ". If the answer to the question is Y (not restored), the process proceeds to "the RO membrane is aged, and therefore, the RO membrane should be replaced. Or to contact the management. "and the like.

Thus, when an RO system is out of order, effective countermeasures can be taken as soon as possible.

Fig. 5 is a configuration diagram of an RO system according to another embodiment. The same components as those in fig. 1 are denoted by the same reference numerals. The raw water is subjected to coagulation treatment and filtration treatment in the pretreatment apparatus 1, and then supplied to the RO apparatus 5 through the pump 2, the valve 3, and the pipe 4. In the above embodiment, as the pretreatment apparatus 1, as shown in fig. 4, an apparatus including: a coagulation processing device 1 a; a filter device 1b for filtering the coagulation treatment water; and a relay tank 1d for storing the filtered water, but the present invention is not limited thereto. Reference numeral 1c denotes a pipe for flowing filtered water into the

relay tank

1d, and 1e denotes a pipe for flowing filtered water from the relay tank 1d to the pump 2. The pipe 1e is provided with a pH meter 19.

pipes

4, 6, and 17 are provided with a pressure sensor 8, a pressure sensor 9, and a pressure sensor 27, respectively. The pipe 6 is further provided with a flowmeter 9A and a thermometer 9B.

The pressures detected by the pressure sensor 8 and the pressure sensor 27 are input to the primary-side flow-path differential pressure detection circuit 20A, and the difference between the two is calculated as a primary-side flow-path 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 the diagnostic device 30A to diagnose.

As shown in fig. 6, the diagnostic device 30A includes a main body 31 and a liquid crystal display panel 36 as an input unit having a 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 data collection unit 32 receives the answer data and the correction flux data of the diagnostic item type data from the display panel 36 in addition to the primary-side channel differential pressure data. The data storage unit 33 stores the response data and the determination result described later together with operation data such as the primary-side channel pressure difference and the correction flux. The database 34 stores data indicating an abnormal operation state of the RO system and a countermeasure against the abnormal operation 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 countermeasure data in the database 34, and displays the countermeasure on the display panel 36.

As shown in fig. 7, when there is an abnormality in the primary-side flow path pressure difference of the RO device 5 (when the primary-side flow path pressure difference or the rate of rise of the primary-side flow path pressure difference is equal to or greater than a predetermined value), an alarm is activated and, for example, a plurality of question characters Q1 to Q6 as follows are displayed on the display panel 36. Further, whether the answer switch Y is Yes or not (No) is displayed adjacent to the right side of each question text. The answer switches Y and N each have an illumination function of changing to a light color when touched once and changing to a dark color when touched again. Y, N, the bright glowing person indicates the selected response. The reply operation is performed by the operation person in charge of the RO system or the like. Further, an alarm switch may be displayed on the display panel 36 in association with an alarm operation, and when the operation person in charge touches the alarm switch, question characters may be displayed.

Q1: SDI of the inlet water of the relay tank is less than α?

Q2: SDI of the inlet water of the relay tank is less than β?

Q3: (ratio of SDI of RO-concentrated water)/(SDI of RO-supplied water) is γ or more?

Q4: na concentration magnification < (Si concentration magnification + δ)?

Q5: na concentration magnification < (Ca concentration magnification + epsilon)?

Q6: na concentration magnification < (Mg concentration magnification + ζ)?

Further, α, β, γ, δ, ε, and ζ represent specific numbers. The question words are an example, and other question words may be further displayed.

When all the question characters are answered by touching the switch Y or the switch N, an input 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 Q1 is N, the judgment unit 35 reads out the following measures a1 and a2 from the database 34 and displays them on the display panel 36.

A1: and driving pins into the UF module.

A2: and carrying out chemical cleaning.

Note that the "driven plug" in the countermeasure a1 is a treatment for inserting a plug into a hollow wire having a damage in the hollow wire module and closing the hollow wire.

When the answer of Q2 is N, it is determined that there is biological contamination, and the following measures B1 and B2 are read from the database 34 and displayed on the display panel 36.

B1: the amount of the viscosity-controlling agent added is increased.

B2: and (5) carrying out chemical cleaning on the RO device.

When the answer to Q3 is N, C1 and C2 are displayed as follows.

C1: the pretreatment conditions were re-evaluated.

C2: and (5) carrying out chemical cleaning on the RO device.

When at least one of the responses Q4 to Q6 is N, it is determined that scale is attached, and the following displays D1 and D2 are performed.

D1: the pH of the RO feed water was re-evaluated and the amount of scale dispersant added was doubled (the strategy for coping was different depending on the type of scale and therefore, communicated to the regulatory authorities).

D2: and (5) carrying out chemical cleaning on the RO device.

In the Q4 to Q6, other non-precipitating substances such as K and Cl may be used instead of Na. In Q4 to Q6, other scale-forming substances such as Ba and Sr may be used instead of Si, Ca and Mg.

When all the responses to Q1 to Q6 are Y, the data is read from the database 34 and displayed as follows. "because a detailed water quality analysis is required, please contact the management department. "

Further, "does the primary-side flow path pressure difference not return even if chemical cleaning is performed? ". If the answer to the question is Y (not restored), the process proceeds to "RO membrane is aged and therefore, the RO membrane should be replaced" or "the administrative department should be contacted". "and the like.

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 coagulant aid used for the coagulation treatment is not particularly limited, but an iron-based coagulant is preferably used. Further, the coagulation treatment may be omitted depending on the water quality.

When an iron-based coagulant is used, the pH is preferably 4.5 to 7.0, particularly preferably 5.0 to 6.0. If the pH is too low, there is a risk of clogging the membrane by 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).

When the membrane filtration module is used in the filtration apparatus 1b, either a cross flow (cross flow) method or a bulk filtration method may be used.

The treatment process by using the membrane filtration module comprises the steps of water passing, air bubbling, backwashing and water filling. The water passing time for filtration is 20-40 minutes. The initial pressure difference between the membranes (difference between the primary pressure and the secondary pressure of the element or the module) was about 0.02MPa to 0.05 MPa. When the pressure difference between the membranes is 0.07MPa to 0.10MPa, it is preferable to perform chemical 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.

The amount of brine (brine) of the RO apparatus 5 is preferably 3.6m³More than h. The RO membrane is not particularly limited, but is preferably an ultra-low pressure membrane having a standard pressure of 0.735MPa, and the membrane area is preferably 35m²～41m². Preferably the initial pure water flux: 1.0m/d (25 ℃) or higher, 0.735MPa, initial salt rejection: more than 98 percent. The recovery rate is preferably set so that the Langelier Index (Langelier Index) of calcium hardness is 0 or less. The recovery rate is preferably set so that the silica concentration in the brine is within the solubility. Furthermore, the recovery rate is usually 50% to 80%.

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 proposed based on japanese patent application nos. 2018-097216, 2018-097218 and 2018-102582 filed on 5/21/2018, the entire contents of which are incorporated herein by reference.

Description of reference numerals

1: a pretreatment device; 5: an RO device; 30. 30A: a diagnostic device; 36: a display panel.

Claims

1. A diagnostic device for a reverse osmosis system, which is a diagnostic device for diagnosing the operating state of a reverse osmosis system comprising a pretreatment device and a reverse osmosis device for subjecting pretreatment water from the pretreatment device to reverse osmosis treatment,

the diagnostic device of the reverse osmosis system comprises:

a receiving unit for receiving a correction flux as index data relating to permeability of the reverse osmosis device;

an input unit for operation state information of the reverse osmosis system;

a storage unit that stores data indicating a relationship between an abnormal operation state of the reverse osmosis system and a countermeasure; and

a determination unit that determines a countermeasure against malfunction of the reverse osmosis apparatus based on the operating state information input by the input unit and the data stored in the storage unit,

the input unit includes a display means for displaying a plurality of questions and an input means for answering the questions,

when the correction flux of the reverse osmosis device is out of a predetermined range or when the rate of decrease of the correction flux is equal to or greater than a predetermined value, the determination unit performs the following diagnosis:

< method of diagnosis >

The display means displays the following question characters Q1 to Q6 for the reverse osmosis apparatus, reads out the following countermeasures from the answers of the question characters Q1 to Q6 inputted by the answer question input means, and displays the countermeasures on the display means:

q1: whether the sludge density index of the reverse osmosis concentrated water is less than 3;

q2: whether the concentration ratio of the non-precipitating standard substance is less (total organic carbon concentration ratio + alpha);

q3: whether or not the concentration ratio of the non-precipitating standard substance is less (UV260 concentration ratio + beta);

q4: whether the concentration ratio of the non-precipitating standard substance is less (concentration ratio of the scale-forming substance + gamma);

q5: whether the concentration ratio of the non-precipitating standard substance is less (concentration ratio of the scale-forming substance + delta);

q6: whether the concentration ratio of the non-precipitating standard substance is less (concentration ratio of the scale-forming substance + epsilon);

α, β, γ, δ, and ε denote specific numbers; UV260 of Q3 represents an organic substance measured by ultraviolet absorptiometry at a wavelength of 260nm, and the scale-forming substance of Q4, the scale-forming substance of Q5 and the scale-forming substance of Q6 are not the same,

< countermeasure >

If the answer to Q1 is no, the following countermeasures a1 to a3 are displayed:

a 1: the addition amount of the viscosity control agent is increased;

a 2: carrying out chemical cleaning;

a 3: when the performance is not recovered, the membrane is replaced,

if at least one of the answers Q2 and Q3 is no, the following measures b1 to b3 are displayed:

b 1: re-evaluating the agglutination conditions;

b 2: carrying out chemical cleaning;

b 3: when the performance is not recovered, the membrane is replaced,

when at least one of the answers Q4 to Q6 is negative, it is judged that scale is adhered, and the following countermeasures c1 and c2 are displayed:

c 1: re-evaluating the pH of the reverse osmosis feed water and doubling the amount of scale dispersant added;

c 2: and cleaning the reverse osmosis device with chemicals.

2. The diagnostic device of a reverse osmosis system of claim 1,

the action state information includes a ratio of a sludge density index value of the feed water to the concentrate water of the reverse osmosis device.

3. The diagnostic device of a reverse osmosis system of claim 2,

the action state information includes a sludge density index value of the water supply to the reverse osmosis device.

4. The diagnostic device of a reverse osmosis system of claim 3,

the pretreatment apparatus comprises a coagulation treatment apparatus and a filtration membrane apparatus for coagulation treatment water,

the operation state information further includes a sludge density index value of the filtered water of the filtering membrane device.

5. The diagnostic device of a reverse osmosis system according to any one of claims 1 to 4,

the operation state information includes the electrical conductivity of the feed water and the permeate water to the reverse osmosis device, the free chlorine concentration of the reverse osmosis feed water, and the oxidation-reduction potential of the reverse osmosis feed water.

6. A diagnostic device for a reverse osmosis system, which is a diagnostic device for diagnosing the operating state of a reverse osmosis system comprising a pretreatment device and a reverse osmosis device for subjecting pretreatment water from the pretreatment device to reverse osmosis treatment,

the diagnostic device of the reverse osmosis system comprises:

a receiving unit for receiving a primary side flow path pressure difference of the reverse osmosis device;

an input unit for operation state information of the reverse osmosis system;

when the primary-side flow path differential pressure of the reverse osmosis device is equal to or greater than a predetermined value, or when the rate of increase of the primary-side flow path differential pressure of the reverse osmosis device is equal to or greater than a predetermined value, the diagnosis is performed as follows:

< method of diagnosis >

q1: whether the sludge density index of the inflow water of the relay tank is less than alpha or not;

q2: whether the sludge density index of the inflow water of the relay tank is less than beta or not;

q3: whether the ratio of (sludge density index of reverse osmosis concentrated water)/(sludge density index of reverse osmosis supplied water) is γ or more;

q4: whether the concentration ratio of the non-precipitating standard substance is less (concentration ratio of the scale-forming substance + delta);

q5: whether the concentration ratio of the non-precipitating standard substance is less (concentration ratio of the scale-forming substance + epsilon);

q6: whether or not the concentration ratio of the non-precipitating standard substance is less (concentration ratio of the scale-forming substance + ζ);

alpha, beta, gamma, delta, epsilon and zeta are specific numbers, the scale-forming substance in Q4, the scale-forming substance in Q5 and the scale-forming substance in Q6 are not the same,

if the answer to Q1 is no, the following countermeasures a1 and a2 are displayed:

a1: inserting a plug pin into a damaged hollow wire in a hollow wire module of a pretreatment device to block the damaged hollow wire;

a2: the chemical cleaning is carried out, and the chemical cleaning is carried out,

if the answer to Q2 is no, the following countermeasures B1 and B2 are displayed:

b1: increasing the addition amount of the viscosity control agent;

b2: the reverse osmosis device is cleaned by chemicals,

if the answer to Q3 is no, the following countermeasures C1 and C2 are displayed:

c1: re-evaluating the pretreatment conditions;

c2: the reverse osmosis device is cleaned by chemicals,

when at least one of the answers Q4 to Q6 is no, it is determined that scale is adhered, and the following measures D1 and D2 are displayed:

d1: re-evaluating the pH of the reverse osmosis feed water and doubling the amount of scale dispersant added;

d2: and cleaning the reverse osmosis device with chemicals.

7. The diagnostic device of a reverse osmosis system of claim 6,