JP7168102B2 - Water treatment equipment design support device and water treatment equipment design support method - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a water treatment device design support device and a water treatment device design support method.

Input conditions required to calculate the operating performance of the reverse osmosis membrane facility, such as the target amount of water to be treated or aging deterioration of the separation membrane, are received, and at least one or more script files are created based on the input conditions, and the script file A reverse osmosis membrane equipment design support device that collects and displays operation performance based on input conditions obtained from simulators that differ at least for each property of reverse osmosis membranes based on, for example, calculation results such as membrane area or number of membranes (Patent Reference 1).

JP 2015-197783 A

However, in the technique of Patent Document 1, although the membrane area or number of separation membranes can be determined according to the input conditions, recovery of the treatment efficiency of the separation membranes by washing is not taken into consideration. When a reverse osmosis membrane facility, such as a water treatment apparatus, operates while cleaning the separation membrane, the deterioration tendency of the separation membrane becomes more complicated than when the separation membrane is not cleaned. When the deterioration tendency of the separation membrane changes, the amount of water that can be treated by the separation membrane changes. As a result, the total area of the separation membranes required for the water treatment apparatus changes, so the technique of Patent Document 1 cannot calculate the total area of the separation membranes required when operating while the separation membranes are being washed. There was a problem.

The present disclosure has been made to solve the above-described problems, and provides a water treatment device design support device and a water treatment device design support method that can calculate the total area of a separation membrane in consideration of washing of the separation membrane. intended to provide

The water treatment device design support device of the present disclosure uses the information on the water to be treated treated by the water treatment device to be designed to estimate the amount of foulant generated that adheres to the separation membrane installed in the water treatment device. A transmembrane difference that calculates the chronological change in the transmembrane pressure difference of the separation membrane when the water treatment apparatus is operated without cleaning the separation membrane using the foulant generation amount calculation unit to calculate and the foulant generation amount. Using the pressure calculator, the time-series change in the transmembrane pressure difference, the decrease in the transmembrane pressure difference due to the cleaning of the separation membrane, and the rate of increase in the transmembrane pressure difference, the separation membrane is washed and the water treatment equipment is operated. Using the washing time transmembrane pressure difference calculation unit that calculates the time series change of the washing time transmembrane pressure difference of the separation membrane and the time series change of the washing time transmembrane pressure difference, and a total area calculator for calculating the total area of the required separation membrane.

The water treatment device design support method of the present disclosure uses the information on the water to be treated treated by the water treatment device to be designed to estimate the amount of foulant generated that adheres to the separation membrane installed in the water treatment device. calculating, using the amount of generated foulant, calculating the time-series change in the transmembrane pressure difference of the separation membrane when the water treatment apparatus is operated without washing the separation membrane, and the transmembrane pressure difference When cleaning the separation membrane when the water treatment device is operated by cleaning the separation membrane using the time-series change of , and the reduction width of the transmembrane pressure difference and the rate of increase of the transmembrane pressure difference due to the cleaning of the separation membrane. It has a step of calculating the time-series change in the transmembrane pressure difference and a step of calculating the total area of the separation membranes required for treatment of the water to be treated using the time-series change in the wash time transmembrane pressure difference. be.

According to the present disclosure, it is possible to calculate the total area of the separation membrane in consideration of washing of the separation membrane.

1 is a block diagram showing a design support device according to a first embodiment; FIG. An example of a foulant generation amount calculation model according to the first embodiment. An example of a transmembrane pressure calculation model according to the first embodiment. FIG. 4 is a relationship diagram showing an example of time-series changes in the transmembrane pressure difference according to the first embodiment; An example of a film deterioration model according to the first embodiment. FIG. 4 is a relationship diagram showing an example of time-series changes in the transmembrane pressure difference during membrane cleaning according to the first embodiment; FIG. 4 is a graph showing the relationship between the transmembrane pressure difference and the amount of water that can be treated according to the first embodiment; 4 is a display example of the total area of the separation membrane according to the first embodiment. 4 is a process diagram showing processing of the design support apparatus according to the first embodiment; FIG. 5 is an example of numerical data showing time-series changes in the transmembrane pressure difference during membrane cleaning according to the first embodiment. FIG. 4 is a relationship diagram showing time-series changes in the transmembrane pressure difference during membrane cleaning according to the first embodiment; FIG. 2 is a block diagram showing a design support device according to a second embodiment; FIG. FIG. 9 is a process chart showing processing of the design support device according to the second embodiment; FIG. 11 is a block diagram showing a design support device according to a third embodiment; FIG. FIG. 11 is a process chart showing processing of the design support device according to the third embodiment; A hardware configuration that implements the functions of the design support device according to the present disclosure. FIG. 4 is a diagram showing an example of input information and output information according to the present disclosure;

Embodiment 1.
FIG. 1 is a block diagram showing a water treatment device design support device (hereinafter referred to as “design support device”) according to Embodiment 1. As shown in FIG. The design support device 100 includes a foulant generation amount calculation unit 1 , a transmembrane pressure calculation unit 2 , a cleaning transmembrane pressure difference calculation unit 3 , and a total area calculation unit 4 . The input device 10 is, for example, a keyboard, a mouse, or the like, and inputs to-be-treated water information (described later) and the like to the design support device 100 via an input unit (not shown in FIG. 1). The output device 5 will be described later.

The design support device 100 includes the quality of the water to be treated, the amount of the water to be treated, and the water to be treated (hereinafter referred to as the “treatment The total area of the separation membrane required for the treatment of the water to be treated in the water treatment equipment is calculated from the water quality of the water to be treated.

A water treatment apparatus is installed, for example, in a sewage treatment plant, and separates (filters) sewage, which is the water to be treated, into activated sludge and treated water using a separation membrane. In a water treatment apparatus, for example, when the separation membrane reaches a predetermined transmembrane pressure difference (described later), the separation membrane is washed. The washed separation membrane is replaced with a new separation membrane after being used again for treating water to be treated. Here, the separation membrane may be a single separation membrane, or may be a membrane module obtained by modularizing the separation membrane. The configuration of the design support apparatus 100 will be described in detail below.

The foulant generation amount calculation unit 1 applies at least one of the amount of water to be treated, the water quality of the water to be treated, and the quality of the water after treatment (hereinafter referred to as "treated water information") to a foulant generation amount calculation model. to calculate the amount of foulant generated. A method for calculating the foulant generation amount will be described later.

Here, the foulant will be explained. The separation membrane removes the substances to be removed from the water to be treated by physically or chemically adhering the substances to be removed contained in the water to be treated, such as activated sludge, to the membrane surface of the separation membrane. A substance to be removed attached to the membrane surface of the separation membrane is a foulant. The rate of increase in foulant adhering to the membrane surface of the separation membrane is determined by the quality of the water to be treated and the quality of the water after treatment, that is, the water quality before and after treatment of the water to be treated.

The foulant accumulates on the membrane surface of the separation membrane and clogs the separation membrane as the operation time of the water treatment apparatus, that is, the treatment time of the water to be treated by the separation membrane elapses. Clogging of the separation membrane reduces the treatment efficiency of the separation membrane. Cleaning of the separation membrane is performed to remove foulants from the separation membrane and restore the treatment efficiency of the separation membrane.

Next, a method for calculating the amount of foulant generated will be described using a model for calculating the amount of foulant generated. FIG. 2 is an example of a foulant generation amount calculation model according to the first embodiment. The vertical axis in FIG. 2 indicates the amount of foulants generated (mgN), and the horizontal axis indicates the amount of water to be treated (m ³ ). FIG. 2 shows a foulant generation amount calculation model X in which the treated water quality is x (mgN/L) and a foulant generation amount calculation model Y in which the treated water quality is y (mgN/L). The foulant generation amount calculation model in FIG. 2 indicates that the foulant generation amount increases as the amount of water to be treated increases. In these foulant generation amount calculation models, the amount of the water to be treated and the foulant generation amount are in a proportional relationship.

For example, when the quality of treated water in the water treatment apparatus is set to x (mgN/L), the foulant generation amount can be calculated by applying the amount of the water to be treated to the foulant generation amount calculation model X. The to-be-treated water information here is the amount of to-be-treated water. Also, the foulant generation amount can be calculated by, for example, the following model formula (1). Note that α in the model formula (1) is a constant of proportionality.

The transmembrane pressure calculator 2 applies the amount of foulant generated to a transmembrane pressure calculation model to calculate the time series change in the transmembrane pressure.

The transmembrane pressure is the difference between the pressure on the side of the water to be treated and the pressure on the side of the treated water. The time-series change in the transmembrane pressure difference indicates the change in the transmembrane pressure difference of the separation membrane when the water to be treated is treated without washing the separation membrane. When foulant adheres to the membrane surface of the separation membrane, clogging causes an increase in the transmembrane pressure difference. As described above, the clogging of the separation membrane lowers the treatment efficiency of the separation membrane, so an increase in the transmembrane pressure difference can be said to be a reduction in the treatment efficiency of the separation membrane, that is, deterioration of the separation membrane.

Here, a method for calculating a time-series change in the transmembrane pressure will be described using a transmembrane pressure calculation model. FIG. 3 is an example of a transmembrane pressure calculation model according to the first embodiment. FIG. 3(a) is a diagram showing the relationship between the processing time (t) and the foulant generation amount (mgN), where the vertical axis indicates the foulant generation amount (mgN) and the horizontal axis indicates the processing time (t). FIG. 3(b) is a diagram showing the relationship between foulant accumulation amount (mgN) and transmembrane pressure difference (kPa), the vertical axis indicates transmembrane pressure difference (kPa), and the horizontal axis indicates foulant generation amount (mgN). indicates

By applying the transmembrane pressure calculation model foulant generation amount to the relationship diagram of FIG. The transmembrane pressure difference is calculated by applying the accumulated foulant amount C to the relationship diagram of FIG. 3(b). The accumulated foulant amount C can be calculated, for example, by the following model formula (2). The transmembrane pressure difference can be calculated, for example, by the following model formula (3). Note that β and M in the model formula (3) are arbitrary constants.

For example, during the processing time (t ₂ -t ₁ ), the foulant generation rate rises from F ₁ to F ₂ . The value obtained by integrating this, that is, the value calculated by the model formula (2) is the accumulated foulant amount C, which is the hatched portion in FIG. 3(a).

Next, time-series changes in the transmembrane pressure using the foulant accumulation amount C will be described. For example, the start of treatment by the separation membrane is treated as treatment time t1, and treatment _times t2, _{t3 , t4} , and _t5 are set at equal intervals. Then, C ₁ is the foulant accumulated during the processing time (t ₂ -t ₁ ), C 2 is the foulant accumulated during the processing time (t ₃ -t ₂ ), and C ₂ is the foulant accumulated during the processing time (t ₄ -t ₃ ). ) is C ₃ , and _{C 4} is the _foulant accumulated during the processing time (t ₅ -t ₄ ). are calculated respectively.

By applying the calculated foulant accumulation amounts C ₁ to C ₄ to FIG. It is possible to obtain the time-series change of the pressure difference between the

Time-series changes in the transmembrane pressure calculated by the above calculation method will be described below. FIG. 4 is a relationship diagram showing an example of time-series changes in the transmembrane pressure according to the first embodiment. The vertical axis in FIG. 4 indicates the transmembrane pressure (kPa), and the horizontal axis indicates the treatment time (t). FIG. 4 shows that the transmembrane pressure increases exponentially as the treatment time increases. This is the time-series change in the transmembrane pressure difference when cleaning of the separation membrane is not considered.

The cleaning transmembrane pressure calculation unit 3 calculates the amount of decrease in the transmembrane pressure and the increase rate of the transmembrane pressure due to cleaning (hereinafter collectively referred to as "cleaning transmembrane pressure calculation conditions"), and the transmembrane pressure Time-series changes in the transmembrane pressure difference during washing of the separation membrane (hereinafter referred to as "membrane washing") are calculated using the time-series changes in the pressure. The conditions for calculating the transmembrane pressure difference during washing are values specific to the separation membrane, and at least one of the washing intensity, the frequency of washing, and the number of times of washing (hereinafter referred to as "washing conditions") is added to the membrane deterioration model (described later) of the separation membrane. can be calculated by applying The amount of reduction in the transmembrane pressure difference due to washing indicates the degree of recovery of the treatment efficiency of the separation membrane due to washing, and the rate of increase in the transmembrane pressure difference indicates the degree of deterioration of the separation membrane. During membrane cleaning, the separation membrane is degraded by foulants and the treatment efficiency of the separation membrane is recovered by cleaning.

The washing strength refers to the physical strength or the concentration of the washing chemical when removing foulants from the membrane surface of the separation membrane. The cleaning frequency refers to the timing of cleaning the separation membrane, for example, when a predetermined transmembrane pressure difference is reached or when a predetermined processing time has elapsed.

Here, the film deterioration model will be explained. FIG. 5 is an example of a film deterioration model according to the first embodiment. The membrane deterioration model expresses the reduction in the rate of decrease in the transmembrane pressure difference and the increase in the rate of increase in the transmembrane pressure difference due to washing. FIG. 5(a) is a calculation model showing that the amount of reduction in the transmembrane pressure difference due to washing and the number of times of washing are in a proportional relationship. In FIG. 5(a), the amount of reduction in the transmembrane pressure difference is referred to as the recovery rate. FIG. 5(b) is a calculation model showing that the rate of increase in the transmembrane pressure difference and the number of times of washing are in an exponential relationship. As described above, the cleaning transmembrane pressure calculation condition is a value unique to the separation membrane. may be entered, for example, by technical staff involved in the design of the water treatment system. In addition, in FIG. 5, the number of times of washing is used as the washing condition, but it is not limited to this.

Model formula (4) shows the degree of decrease in the transmembrane pressure difference due to washing, and model formula (5) shows the rate of increase in the transmembrane pressure difference. Model formula (4) and model formula (5) are examples, respectively, and are not limited to these. γ (γ<0) is a constant of proportionality, and ε, N, and Q are arbitrary constants.

Next, a time-series change in the transmembrane pressure difference during membrane cleaning will be described. FIG. 6 is a relationship diagram showing an example of time-series changes in transmembrane pressure during membrane cleaning according to the first embodiment. The vertical axis in FIG. 6 indicates the transmembrane pressure (kPa), and the horizontal axis indicates the treatment time (t). In FIG. ₆ , the separation membrane is washed when the transmembrane pressure difference reaches P3. That is, the separation membrane is washed in S1 _, S2, and _S3 of _FIG .

The time-series change in the transmembrane pressure difference during membrane cleaning refers to the time-series change in the transmembrane pressure difference of the separation membrane when the separation membrane is cleaned, that is, the secular deterioration of the separation membrane during membrane cleaning. The treatment efficiency of the separation membrane is recovered by washing, but the degree of reduction in the transmembrane pressure difference due to washing, that is, the degree of recovery of the treatment efficiency of the separation membrane decreases as the number of washings increases. As shown in FIG. ₆ , with _an increase in the _number of washings _, the reduction width W2 of the transmembrane differential pressure after washing in S2 is smaller _than the reduction width W1 after washing in S1 and _The reduction width _W3 of the transmembrane pressure of S2 is smaller _than the reduction width W2 of S2 after washing. _In other words, the transmembrane pressure P4 immediately after washing increases as the number of washings increases. The reduction widths W ₁ to W ₃ can be calculated by model formula (4).

Furthermore, the rate of increase of the transmembrane pressure difference, ie, the time required to reach the transmembrane pressure difference P3 _, decreases as the number of washings increases. Therefore, as shown in FIG. 6, the transmembrane pressure difference at the time of membrane cleaning increases and decreases while shortening the period of increase (T ₁ , T ₂ , and T ₃ ) while repeating an increase and a decrease. The rising periods T ₁ to T ₃ can be calculated based on the reduction width of the transmembrane pressure calculated by the model formula (4) and the increase rate of the transmembrane pressure calculated by the model formula (5). Then, when the transmembrane pressure difference _P4 reaches a predetermined value, it is considered that the width of decrease due to washing has become small, and the separation membrane can be replaced.

The total area calculator 4 calculates the total area of the separation membranes required for the water treatment apparatus using the time-series change in the transmembrane pressure difference during membrane cleaning. FIG. ⁷ is a graph showing the relationship between the transmembrane pressure difference and the amount of water that can be treated according to the ^first embodiment. The horizontal axis is the transmembrane pressure (kPa).

As described above, the separation membrane is replaced when the transmembrane pressure difference _P4 reaches a predetermined value. Here, it is assumed that the separation membrane is replaced at the transmembrane differential pressure _P4 at the end of T2 in FIG. _The rising period T1 and the rising period T2 _are separated by regular intervals, for example, every day. By obtaining the transmembrane pressure difference for each day and applying it to FIG. 7, the amount of treatable water for each day can be calculated. By adding these ^{, it is possible to calculate the amount of water that can be treated per 1 cm 3} _{of the} separation membrane in the rising cycle T1 and the rising cycle T2.

By dividing the amount of water to be treated that flows into the water treatment apparatus by the amount of water that can be treated, the _total area of the separation membrane required during the rising period _T1 to T2 can be calculated.

Furthermore, by dividing the calculated total area of the separation membrane by the surface area per separation membrane, the number of separation membranes installed in the water treatment apparatus can be calculated.

If the separation membrane is not washed, the treatment efficiency of the separation membrane will not recover, and the transmembrane pressure difference will monotonically increase. Therefore, the amount of water that can be treated in the rising cycle _T1 and the rising cycle _T2 decreases. As a result, the _total area of the separation membranes required between the rising cycle T1 and the rising cycle T2 increases, and the _number of separation membranes installed in the water treatment apparatus is also calculated to be larger than when cleaning the separation membranes. be done.

In FIG. 7, the vertical axis represents the amount of water that can be treated, but the present invention is not limited to this, and the concentration of the water to be treated may be used.

FIG. 8 shows a display example of the total area of the separation membrane according to the first embodiment. The calculated total area is displayed on the output device 5, such as a display. Output data obtained by converting the total area into the number of separation membranes may be displayed on the output device 5 as shown in FIG. Based on the output data displayed on the output device 5, the user can determine the number of separation membranes to be installed in the water treatment apparatus. Here, the number of separation membranes may be the number of membrane modules or the number of separation membranes stored in a membrane module.

FIG. 9 is a process chart showing processing of the design support device according to the first embodiment. The foulant generation amount calculation unit 1 calculates the foulant generation amount by applying the information on the water to be treated input from the input device 10 via the input unit (not shown in FIG. 1) to the foulant generation amount calculation model (step S1). The amount of generated foulant is input to the transmembrane pressure calculator 2 .

The transmembrane pressure calculator 2 applies the amount of generated foulant to the transmembrane pressure calculation model to calculate the time-series change of the transmembrane pressure (step S2). The time-series change in the transmembrane pressure is input to the washing transmembrane pressure calculator 3 .

The cleaning transmembrane pressure calculation unit 3 uses the cleaning transmembrane pressure calculation condition and the time series change of the transmembrane pressure input from the input device 10 via the input unit (not shown in FIG. 1). Then, the time-series change in the transmembrane pressure difference during membrane cleaning is calculated (step S3). A time-series change in the transmembrane pressure difference during membrane cleaning is input to the total area calculator 4 .

The total area calculator 4 calculates the total area of the separation membrane using the time-series change in the transmembrane pressure difference during membrane cleaning (step S4). The calculated separation membrane is displayed on the output device 5 via an output unit (not shown in FIG. 1).

FIG. 10 is an example of numerical data showing time-series changes in the transmembrane pressure during membrane cleaning according to the first embodiment, and FIG. FIG. 10 is a relational diagram showing time-series changes; FIG. 11 is obtained by applying the numerical data of FIG. 10 to the model formulas (1) to (3) described above.

The treatment time in FIG. 10 indicates the time (months) elapsed from the start of treatment by the separation membrane, and the transmembrane pressure difference indicates the transmembrane pressure difference (kPa) corresponding to each treatment time. Separation membrane cleaning in FIG. 10 indicates whether or not the separation membrane is cleaned. For example, "o" in the separation membrane cleaning column at treatment time "8" indicates that the separation membrane was cleaned between the 7th month and the 8th month from the start of treatment. Therefore, the transmembrane pressure difference at the 8th month is lower than the transmembrane pressure difference at the 7th month from the start of the treatment. The vertical axis in FIG. 11 indicates the transmembrane pressure (kPa) after washing, and the horizontal axis indicates the treatment time (months) from the start of treatment.

As shown in FIG. 10, the washing of the separation membrane was performed between the 7th and 8th months, the 10th and 11th months, the 12th and 13th months, and the 14th and 15th months. , in FIG. 11, the transmembrane pressure at the 8th month, the 11th month, the 13th month, and the 15th month is The transmembrane pressure is decreasing from the second month. In addition, the transmembrane pressure difference immediately after washing gradually increases as the treatment time elapses.

As described above, the design support apparatus 100 uses the information on the water to be treated that is to be treated by the water treatment apparatus to be designed to estimate the amount of foulant that adheres to the separation membrane installed in the water treatment apparatus. Using the foulant generation amount calculation unit 1 to calculate and the amount of foulant generation, the time-series change of the transmembrane pressure difference of the separation membrane when the water treatment apparatus is operated without washing the separation membrane is calculated. Using the differential pressure calculation unit 2, the time-series change in the transmembrane differential pressure, the decrease in the transmembrane differential pressure due to the cleaning of the separation membrane, and the rate of increase in the transmembrane differential pressure, the separation membrane is washed and the water treatment apparatus Water to be treated is calculated by using a washing time transmembrane pressure difference calculation unit 3 that calculates a time series change in the washing time transmembrane pressure difference of the separation membrane and a time series change in the washing time transmembrane pressure difference and a total area calculator 4 for calculating the total area of the separation membrane required for the treatment of .

With the configuration described above, the design support device 100 can calculate the total area of the separation membrane in consideration of washing of the separation membrane.

As a result, the total area of the separation membrane can be calculated by simulation when designing the water treatment apparatus, so the operating cost of the separation membrane can be suppressed.

When the separation membrane is sheet-like, output data obtained by converting the total area into the number of separation membranes may be displayed on the output device 5 .

Embodiment 2.
FIG. 12 is a block diagram of a design support apparatus according to a second embodiment; The design support device 200 includes a foulant generation amount calculation unit 1 , a transmembrane pressure calculation unit 2 , a cleaning transmembrane pressure difference calculation unit 3 , a total area calculation unit 4 , and a membrane determination unit 6 . The design support device 200 differs from the design support device 100 in that it calculates the total area of a plurality of separation membranes and determines the separation membrane to be used in the water treatment device based on the result of comparing the calculated total areas. . In FIG. 12, the same reference numerals as those in FIG. 1 denote the same or corresponding configurations, and detailed description thereof will be omitted.

There are multiple types of separation membranes. Moreover, even for the same type of separation membrane, the specifications of the separation membrane differ depending on the manufacturer. Since these separation membranes have different separation capacities, it is necessary to select a separation membrane according to the type of water to be treated in the water treatment apparatus, the quality of the treated water, and the like.

In Embodiment 2, the total area of a plurality of separation membranes (separation membrane A and separation membrane B) is calculated and compared under the same washing conditions. Details will be described below. The separation membrane A may be expressed as the first separation membrane, and the separation membrane B may be expressed as the second separation membrane.

The foulant generation amount calculation unit 1 calculates the foulant generation amounts of the separation membrane A and the separation membrane B by applying the information of the water to be treated to the foulant generation amount calculation model. The treatment capacities of separation membrane A and separation membrane B are known. For example, if the treated water quality is x (mgN/L) and y (mgN/L), separation membrane A is The foulant generation amount calculation model X shown in FIG. 2 and the foulant generation amount calculation model Y shown in FIG.

The transmembrane pressure calculation unit 2 applies the amount of generated foulant to the transmembrane pressure calculation model, and calculates the time-series changes in the transmembrane pressure of the separation membrane A and the time-series change of the transmembrane pressure of the separation membrane B, respectively. calculate.

The cleaning transmembrane pressure difference calculation unit 3 uses the cleaning time transmembrane pressure difference calculation condition and the time-series change in the transmembrane pressure difference of the separation membrane A and the separation membrane B to calculate the membrane cleaning of the separation membrane A and the separation membrane B. Time-series changes in transmembrane pressure are calculated.

The total area calculation unit 4 calculates the total areas of the separation membrane A and the separation membrane B required for the water treatment apparatus using the time-series change in the transmembrane pressure difference during membrane cleaning of the separation membrane A and the separation membrane B. do.

The membrane determination unit 6 compares the total areas of the separation membrane A and the separation membrane B, and determines the separation membrane to be adopted for the target water treatment apparatus from the separation membrane A and the separation membrane B.

The output device 5 displays, for example, the separation membrane name of the determined separation membrane and the determined total area of the separation membrane.

13A and 13B are process charts showing processing of the design support apparatus according to the second embodiment. The foulant generation amount calculation unit 1 applies the information on the water to be treated input by the input device 10 via the input unit (not shown in FIG. 12) to the foulant generation amount calculation model of the separation membrane A and the separation membrane B, A foulant generation amount is calculated (step S5). The calculated foulant generation amounts of the separation membrane A and the separation membrane B are input to the transmembrane pressure difference calculator 2, respectively.

The transmembrane pressure calculation unit 2 applies the amount of foulant generated in the separation membrane A and the separation membrane B to the transmembrane pressure calculation model, and calculates the time-series changes in the transmembrane pressure difference of the separation membrane A and the separation membrane B. (step S6). The calculated time-series changes in the transmembrane pressure difference between the separation membrane A and the separation membrane B are input to the washing time transmembrane pressure difference calculation unit 3 .

The cleaning transmembrane pressure calculation unit 3 calculates the cleaning transmembrane pressure calculation conditions input by the input device 10 via the input unit (not shown in FIG. 12), the separation membrane A and the separation membrane B Time-series changes in the transmembrane pressure difference during membrane cleaning of the separation membrane A and the separation membrane B are calculated (step S7). The calculated time-series changes in the transmembrane pressure difference during membrane cleaning of the separation membrane A and the separation membrane B are input to the total area calculation unit 4, respectively.

The total area calculation unit 4 calculates the total area of the separation membrane A and the separation membrane B required for the water treatment apparatus using the time-series change in the transmembrane pressure difference during the washing of the separation membrane A and the separation membrane B. (Step S8). The calculated total areas of separation membrane A and separation membrane B are input to membrane determination unit 6 .

The membrane determining unit 6 compares the total areas of the separation membranes A and B, and determines the separation membrane to be used in the water treatment apparatus from the compared total areas of the separation membranes A and B (steps S9 and S10). . For example, when the total area of separation membrane B is calculated to be smaller than the total area of separation membrane A, separation membrane B is determined as the separation membrane to be employed in the water treatment apparatus. The determined separation membrane is displayed on the output device 5 via an output unit (not shown in FIG. 12).

As described above, the transmembrane pressure calculator 2 of the design support device 200 calculates the time series changes in the transmembrane pressures of the separation membrane A and the separation membrane B, and the cleaning time transmembrane pressure calculator 3 calculates , the time-series change in the transmembrane pressure difference of the separation membrane A and the separation membrane B, and the reduction width of the transmembrane pressure difference and the increase rate of the transmembrane pressure difference due to washing of the separation membrane, the separation membrane A and the separation membrane B The total area calculation unit 4 uses the time-series changes in the cleaning transmembrane pressure difference of the separation membrane A and the separation membrane B to calculate the necessary The total areas of separation membrane A and separation membrane B are calculated respectively.

Furthermore, the design support device 200 compares the total areas of the separation membrane A and the separation membrane B, and determines the separation membrane to be adopted for the water treatment device from among the compared separation membranes A and B. is provided.

With the above-described configuration, the design support device 200 can calculate the total area of the separation membranes in consideration of washing of the separation membranes, and determine the separation membrane to be adopted for the water treatment apparatus from among the separation membranes A and B. can.

Output data such as the determined number of separation membranes or the number of sheets may be displayed on the output device 5 .

In addition, an example of displaying the separation membrane names of the determined separation membranes on the output device 5 has been shown. Even if the user selects a separation membrane by displaying the area and the like on the output device 5 and considering not only the displayed total area and the like but also various conditions such as the cost of cleaning each separation membrane. good.

In addition, although an example of comparing separation membrane A and separation membrane B has been shown, three or more types of separation membranes, that is, a plurality of types of separation membranes may be compared.

Alternatively, after calculating the total area of each of the separation membrane A and the separation membrane B, the respective total areas may be compared to determine the separation membrane to be employed in the water treatment apparatus. That is, after calculating the total area of the separation membrane A (steps S5 to S8), the total area of the separation membrane B is calculated (steps S5 to S8), and the calculated total areas are compared to perform water treatment. A separation membrane to be used in the device may be determined (steps S9 and S10).

Embodiment 3.
FIG. 14 is a block diagram of a design support device according to a third embodiment; The design support device 300 includes a foulant generation amount calculator 1 , a transmembrane pressure calculator 2 , a cleaning transmembrane pressure calculator 3 , a total area calculator 4 , and a condition determination unit 7 . The design support device 300 calculates the total area of the separation membrane under a plurality of cleaning conditions, compares the calculated total areas, and determines the cleaning conditions to be used in the water treatment device. different from In FIG. 14, the same reference numerals as those in FIG. 1 denote the same or corresponding configurations, and detailed description thereof will be omitted.

When the washing conditions of the separation membrane are different, for example, when the washing intensity is different, even if the same separation membrane is used, the required total area of the separation membrane may change. The design support device 300 calculates the total area of the separation membrane under a plurality of cleaning conditions (cleaning condition α and cleaning condition β), compares the calculated total areas, and determines the cleaning conditions to be used in the water treatment apparatus. to decide. The foulant generation amount calculation unit 1 and the transmembrane pressure difference calculation unit 2 have the same functions as those of the design support device 100, and thus description thereof is omitted. Note that the cleaning condition α may be expressed as the first cleaning condition, and the cleaning condition β may be expressed as the second cleaning condition.

The cleaning transmembrane pressure calculation unit 3 uses the cleaning transmembrane pressure calculation conditions of the cleaning conditions α and the cleaning conditions β and the time series change in the transmembrane pressure of the separation membrane to calculate the cleaning conditions α and Time-series changes in the transmembrane pressure difference during membrane cleaning under the cleaning condition β are calculated.

The total area calculation unit 4 calculates the total area under the cleaning conditions α and β necessary for the water treatment apparatus, using the time-series change in the transmembrane pressure difference during membrane cleaning under the cleaning conditions α and β. do.

The condition determining unit 7 compares the total area of the cleaning conditions α and the cleaning conditions β, and determines the cleaning conditions to be adopted for the target water treatment apparatus.

The output device 5 displays the determined cleaning conditions and the total area of the separation membrane.

FIG. 15 is a process chart showing processing of the design support device according to the third embodiment. Steps S1 and S2 are the same processes as in the design support apparatus 100, so detailed description thereof will be omitted.

The cleaning transmembrane pressure calculation unit 3 calculates the cleaning transmembrane pressure calculation conditions for each of the cleaning conditions α and the cleaning conditions β input by the input device 10 via the input unit (not shown in FIG. 14). Time-series changes in the transmembrane pressure difference of the separation membrane are calculated to calculate time-series changes in the transmembrane pressure difference during membrane cleaning under the cleaning conditions α and β (step S11). The calculated time-series changes in the transmembrane pressure difference during membrane cleaning under the cleaning conditions α and β are input to the total area calculator 4 .

The total area calculation unit 4 calculates the total area of the separation membrane required for the water treatment device under each cleaning condition using the time-series change in the transmembrane pressure difference during membrane cleaning under the cleaning conditions α and β. (step S12).

The condition determination unit 7 compares the total areas of the separation membranes under the cleaning conditions α and β, and determines the cleaning conditions to be used for the water treatment apparatus (steps S13 and S14). The cleaning conditions adopted for the target water treatment apparatus are, for example, cleaning conditions that make the total area of the separation membrane smaller. The determined cleaning conditions and the calculated total area of the separation membrane are displayed on the output device 5 via the output unit (not shown in FIG. 14).

As described above, the cleaning transmembrane pressure difference calculator 3 of the design support device 300 calculates the time series change in the transmembrane pressure and the decrease in the transmembrane pressure due to cleaning of the separation membrane for the cleaning conditions α and β. Using the width and the rate of increase in the transmembrane pressure difference, the time-series change in the cleaning time transmembrane pressure under the cleaning conditions α and β is calculated. The total areas of the separation membranes under the cleaning conditions α and β are calculated using the time-series changes in the transmembrane pressure difference during cleaning.

Furthermore, the design support device 300 compares the total area of the separation membranes under the cleaning conditions α and β, and determines the cleaning conditions to be used for the water treatment apparatus from among the compared cleaning conditions α and β. A determination unit 7 is provided.

With the above-described configuration, the design support device 300 calculates the total area of the separation membrane in consideration of the cleaning of the separation membrane, and determines the cleaning conditions to be adopted for the water treatment apparatus from among the cleaning conditions α and β. can be done.

Output data obtained by converting the total area of separation membranes into the number of separation membranes may be displayed on the output device 5 together with the determined cleaning conditions.

Further, although an example of displaying the determined cleaning conditions on the output device 5 has been shown, the total area of each of the cleaning conditions α and β can be displayed on the output device 5 without providing the condition determining unit 7. , the user may select the cleaning conditions in consideration of not only the total area of the separation membrane but also the cost required for each cleaning condition.

Also, an example of comparing the cleaning conditions α and the cleaning conditions β has been shown, but three or more types, that is, a plurality of cleaning conditions may be compared.

In addition, it is also possible to calculate the total area under a plurality of washing conditions for a plurality of types of separation membranes, and obtain the optimum separation membrane and washing conditions.

Further, after calculating the total areas of the separation membranes under the cleaning conditions α and β separately, the respective total areas may be compared to determine the cleaning conditions to be employed in the water treatment apparatus. That is, after calculating the total area under the cleaning condition α (steps S1, S2, S11, and S12), the total area under the cleaning condition β is calculated (steps S1, S2, S11, and S12), and each calculated The total area may be compared to determine the cleaning conditions to be employed for the water treatment device (steps S13 and S14).

Here, FIG. 16 is a hardware configuration example that implements the functions of the design support apparatus according to the present disclosure. The memory 8 stores programs for executing the functions of the design support apparatuses 100, 200, and 300, and the processor 9 reads out and executes the programs stored in the memory 8. FIG. Input units (not shown in FIGS. 1, 12, and 14) of the design support devices 100, 200, and 300 are realized by the input device 10. FIG. An output unit (not shown in FIGS. 1, 12, and 14) is realized by the output device 5. FIG. The processor 9 receives necessary information through an input section, reads out and executes a program stored in the memory 8, and outputs the result through an output section.

In addition, in the present disclosure, a plurality of calculation models are proposed for the foulant generation amount calculation model according to the type of water to be treated, such as seawater, domestic wastewater, or industrial wastewater. It may be selected according to the water to be treated.

In addition, as a transmembrane pressure difference calculation model, a plurality of calculation models expressing the rising tendency of the transmembrane pressure difference with respect to the treatment time have been proposed. good.

In addition, as a membrane deterioration model, a plurality of calculation models have been proposed according to the type of separation membrane or the type of water to be treated. .

FIG. 17 is a diagram showing an example of input information and output information according to the present disclosure. The input information includes information on the water to be treated, washing conditions, and conditions for calculating the transmembrane pressure during washing. The input information is not limited to the information on the water to be treated, the cleaning conditions, and the transmembrane pressure calculation conditions during cleaning shown in FIG. 17, and may be selected according to the selected calculation model. Likewise, the output information may be selected according to the shape of the separation membrane and the like.

In addition, in the present disclosure, an example is shown in which the input device 10 inputs the information on the water to be treated to the foulant generation amount calculation unit 1 and the cleaning transmembrane pressure calculation condition to the cleaning transmembrane pressure calculation unit 3. The design support apparatuses 100, 200, and 300 may be provided with a water-to-be-treated information storage unit that stores water-to-be-treated information. Furthermore, the design support apparatuses 100, 200, and 300 may be provided with a cleaning transmembrane pressure calculation condition storage unit that stores the cleaning transmembrane pressure calculation conditions. The treated water information and the cleaning transmembrane pressure calculation conditions are input to the foulant generation amount calculation unit 1 and the cleaning transmembrane pressure calculation unit 3 from the treated water information storage unit and the cleaning transmembrane pressure calculation conditions. As a result, since the user does not directly input, input errors by the user can be suppressed, and the total area of the separation membrane can be calculated efficiently. When the treated water information is used in the transmembrane pressure calculation section 2 and the total area calculation section 4, it may be input from the treated water information storage section.

Further, when the cleaning conditions are input to the membrane deterioration model in the cleaning transmembrane pressure difference calculation unit 3 and the reduction width of the transmembrane pressure difference and the increase rate of the transmembrane pressure difference due to cleaning of the separation membrane are calculated, the cleaning conditions are stored. may be provided, and the cleaning conditions may be input from the cleaning condition storage unit to the cleaning transmembrane pressure calculation unit 3 .

In addition, the information on the water to be treated, the amount of reduction in the transmembrane pressure difference due to washing of the separation membrane, and the rate of increase in the transmembrane pressure difference may be input to the design support devices 100, 200, and 300 from an external server.

Further, in the present disclosure, an example in which the calculated total area of the separation membrane is displayed on the output device 5 is shown. may be displayed.

Also, in the present disclosure, an example of installing the water treatment device in the sewage treatment plant was shown, but it may be installed in a factory or the like.

In addition, as a separation membrane, a microfiltration membrane (MF membrane), an ultrafiltration membrane (UF membrane), a reverse osmosis membrane (RO membrane), or a nanofilter (Nanofiltration Membrane, NF membrane) ) etc. can be used.

Note that the configurations shown in the above embodiments are examples of the content of the present disclosure, and can be combined with other known techniques. Appropriately omitting or modifying a part of is also included in the scope of the present disclosure.

1 foulant generation amount calculation unit, 2 transmembrane pressure calculation unit, 3 washing time transmembrane pressure calculation unit,
4 total area calculation unit, 5 output device, 6 film determination unit, 7 condition determination unit, 8 memory,
9 processor, 10 input device, 100, 200, 300 design support device.

Claims (9)

A foulant generation amount calculation unit that calculates the generation amount of foulant that adheres to a separation membrane installed in the water treatment apparatus using the water information of the water to be treated that is to be treated by the water treatment apparatus to be designed;
a transmembrane pressure difference calculation unit that uses the amount of generated foulant to calculate a time-series change in the transmembrane pressure difference of the separation membrane when the water treatment apparatus is operated without washing the separation membrane;
Using the time-series change in the transmembrane pressure difference, the amount of decrease in the transmembrane pressure difference due to the cleaning of the separation membrane, and the rate of increase in the transmembrane pressure difference, the separation membrane is washed and the water treatment apparatus is operated. a washing time transmembrane pressure difference calculation unit that calculates a time-series change in the washing time transmembrane pressure difference of the separation membrane in the case;
and a total area calculation unit that calculates the total area of the separation membrane required for treatment of the water to be treated, using the time-series change in the transmembrane pressure difference during washing. The transmembrane pressure difference calculation unit calculates time-series changes in the transmembrane pressure difference of the first separation membrane and the second separation membrane,
The cleaning transmembrane pressure difference calculation unit calculates the time-series change in the transmembrane pressure difference of the first separation membrane and the second separation membrane, using the rate of increase in the transmembrane pressure difference, calculating time-series changes in the transmembrane pressure difference during washing of the first separation membrane and the second separation membrane, respectively;
The total area calculation unit calculates the first separation membrane and the calculating the total area of each of the second separation membranes;
The water treatment device design support device according to claim 1. comparing the total areas of the first separation membrane and the second separation membrane, and determining the separation membrane to be employed in the water treatment device from among the compared first separation membrane and the second separation membrane; 3. The water treatment device design support device according to claim 2, further comprising a membrane determination unit that The washing-time transmembrane pressure difference calculation unit calculates a time-series change in the transmembrane pressure difference, a decrease in the transmembrane pressure difference due to washing of the separation membrane with respect to the first washing condition and the second washing condition, and calculating a time-series change in the cleaning transmembrane pressure difference under the first cleaning condition and the second cleaning condition using the differential pressure increase rate;
The total area calculation unit calculates the calculating the total area of each of the separation membranes;
The water treatment device design support device according to claim 1. The total area of the separation membrane under the first cleaning condition and the second cleaning condition is compared, and one of the compared first cleaning conditions and the second cleaning condition is adopted for the water treatment device. 5. The water treatment device design support device according to claim 4, further comprising a condition determination unit that determines cleaning conditions. The water treatment device design support device according to any one of claims 1 to 5, further comprising a treated water information storage unit for storing said treated water information of said treated water. The information on the water to be treated is at least one of the amount of the water to be treated, the quality of the water to be treated, and the quality of the water to be treated after treatment.
The water treatment device design support device according to any one of claims 1 to 6. 8. The washing-time transmembrane pressure difference calculation condition storage unit that stores a reduction amount of the transmembrane pressure difference and an increase rate of the transmembrane pressure difference due to washing of the separation membrane. The water treatment device design support device according to item 1. a step of calculating the generated amount of foulant adhering to the separation membrane installed in the water treatment apparatus using the information on the water to be treated which is to be treated by the water treatment apparatus to be designed;
a step of calculating a time-series change in the transmembrane pressure difference of the separation membrane when the water treatment apparatus is operated without washing the separation membrane, using the amount of generated foulant;
Using the time-series change in the transmembrane pressure difference, the amount of decrease in the transmembrane pressure difference due to the cleaning of the separation membrane, and the rate of increase in the transmembrane pressure difference, the separation membrane is washed and the water treatment apparatus is operated. a step of calculating a time-series change in the transmembrane pressure difference during cleaning of the separation membrane in the case;
and calculating the total area of the separation membranes required for treatment of the water to be treated, using the chronological change in the transmembrane pressure difference during washing.

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