Process calculation method, calculation program and calculation system for water treatment process

Abstract

A process calculation method for a water treatment process having a plurality of water treatment unit processes, comprising: A. a step of determining a calculation order of the unit icons based on a predetermined rule, for a water treatment process flow formed by a step of arranging unit icons of water treatment unit processes and wiring between the unit icons; B. after step A, a step of estimating at least one item of the flow rate, water quality, temperature, and water pressure of the treated water for each unit icon in accordance with the calculation order; C. after step B, a step of adjusting at least one item of the flow rate, water quality, temperature, and water pressure of the treated water estimated in step B so as to prevent any contradiction in material balance or energy balance for the water treatment process flow; and D. after step C, a step of determining whether or not steps B and C need to be repeatedly executed.

Description

[Technical field]

[0001] The present invention relates to a process calculation method, a calculation program, and a calculation system for a water treatment process in which raw water is treated to obtain treated water. [Background technology]

[0002] Water treatment processes use water treatment devices such as sedimentation, flotation, centrifugation, coagulation, mixing, aerobic treatment, anaerobic treatment, filtration, squeezing, filter cloth, microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, advanced oxidation, ion exchange, adsorption, absorption, deaeration, crystallization, distillation, heat exchange, and mineral addition, which are selected or combined according to the raw water and produced water uses.

[0003] Among these, membrane separation has been expanding in recent years in various fields due to its features of energy saving, space saving, and improved treated water quality. For example, microfiltration membranes and ultrafiltration membranes are applied to water purification processes that produce industrial water and tap water from river water, groundwater, and treated sewage water, and reverse osmosis membranes are applied to seawater desalinization. In addition, various water treatment processes have been devised and introduced, such as combining sedimentation, flotation, centrifugation, and coagulation treatments as pretreatment for these separation membranes to stabilize the operability of the separation membranes, and combining ion exchange as posttreatment for separation membranes to use them for pure water production.

[0004] In such water treatment processes, it is common to determine a treatment flow for the water treatment process using each water treatment device in advance, and then perform calculations for the water treatment process, such as water balance calculations, heat balance calculations, and material balance calculations, in accordance with the treatment flow using simulation software on a computer.

[0005] Patent Document 1 describes a simulation calculation that estimates the steady state of a chemical process by using a sequential module-type calculation method in which units such as reactors and distillation columns are connected on a computer to simulate the entire chemical process and design calculations are performed for each unit starting from the upstream side.

[0006] However, in processes involving a circulating flow, i.e., in processes in which the calculation results of a downstream unit are provided to an upstream unit, it can be difficult to apply this calculation method because the input information required for the calculation is insufficient at the time of calculating the upstream unit, making the calculation impossible.

[0007] Furthermore, in consideration of the above-mentioned problems, Patent Document 2 describes a simulation calculation that creates a treatment flow diagram for a water treatment system, sets initial values, and calculates the water balance, heat balance, and material balance for each water treatment device unit in turn, and then performs design calculations for each unit (calculation of the required number of reverse osmosis membrane elements, the required pump power, etc.).

[0008] However, in an actual water treatment process, the water balance, heat balance, material balance, and design calculations of each unit affect each other, so the above-mentioned method may result in low calculation accuracy.In addition, in the design of an actual water treatment system, design conditions such as the number of reverse osmosis membrane elements may be predetermined due to restrictions such as the installation space of the device, and the above-mentioned method, in which design calculations are performed last, requires repeated calculations while searching for water balance and material balance that satisfy the predetermined design conditions, which may require a great deal of effort. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 7-311762 [Patent Document 2] Japanese Patent No. 6107303 Summary of the Invention [Problem to be solved by the invention]

[0010] An object of the present invention is to provide a method for accurately and quickly calculating any water treatment process, including complex processes involving circulating flows, in which raw water is treated to obtain treated water. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention provides A process calculation method for a water treatment process having a plurality of water treatment unit processes, comprising: Provided is a process calculation method for a water treatment process, characterized in that the method comprises the following steps A to D for a water treatment process flow formed by arranging unit icons of water treatment unit processes and wiring between the unit icons: A. A step of determining the calculation order of the unit icons based on a predetermined rule B. After the step A, a step of estimating at least one of the flow rate, water quality, temperature, and water pressure of the treated water for each unit icon according to the calculation order. C. After step B, a step of adjusting at least one of the flow rate, water quality, temperature, and water pressure of the raw water or treated water estimated in step B so that no contradiction occurs in the material balance or energy balance of the water treatment process flow. D. A step of determining whether or not the steps B and C are to be repeatedly executed after the step C. Effect of the Invention

[0012] According to the process calculation method of the present invention, it is possible to accurately and quickly calculate any water treatment process, including complex processes involving circulating flows, and therefore it is possible to contribute to the accurate and rapid design of water treatment processes. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a flow diagram showing an example of a water treatment process according to an embodiment. [Diagram 2]FIG. 1 is a flow diagram illustrating an example of a calculation method according to an embodiment. [Diagram 3] FIG. 1 is a flow diagram illustrating an example of a calculation method according to an embodiment. [Figure 4] FIG. 1 is a flow diagram illustrating an example of a calculation method according to an embodiment. [Diagram 5] FIG. 1 is a flow diagram illustrating an example of a calculation method according to an embodiment. [Figure 6] FIG. 1 is a flow diagram illustrating an example of a calculation method according to an embodiment. [Figure 7] FIG. 1 is a flow diagram showing an example of a water treatment process according to an embodiment. [Figure 8] FIG. 1 is a flow diagram showing an example of a water treatment process according to an embodiment. [Figure 9] FIG. 1 is a flow diagram showing an example of a water treatment process according to an embodiment. [Figure 10] FIG. 1 is a schematic diagram showing an example of an embodiment. [Figure 11] FIG. 1 is a schematic diagram showing an example of an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present invention will be described in more detail below based on the embodiments shown in the drawings. Note that, although the following description will be given using a water treatment process flow using an ultrafiltration membrane and a reverse osmosis membrane as an example, the present invention is not limited to the following embodiments.

[0015] In the water treatment process flow of this embodiment, as shown in Fig. 1, for example, raw water 1 is treated by a membrane treatment method using an ultrafiltration membrane 2 and a reverse osmosis membrane 3 to obtain product water 4. In a water treatment process, three types of water flow are always present: raw water, product water, and wastewater. The raw water is treated in each water treatment device, and is finally separated into product water and wastewater. The raw water is a solution to be treated in the water treatment process, and examples thereof include river water, groundwater, seawater, sewage treatment water, industrial wastewater, and culture liquid.

[0016] Raw water 1 is pumped to an ultrafiltration membrane 2 by a raw water pump 5 and filtered. Although an ultrafiltration membrane is described in FIG. 1, a microfiltration membrane may also be used. The pore size of the separation membrane used in the ultrafiltration membrane or microfiltration membrane is not particularly limited as long as it is porous, but a membrane with a different pore size may be used depending on the properties and amount of the desired water to be treated. The shape of the separation membrane may be a hollow fiber membrane, a flat membrane, a tubular membrane, a monolith membrane, or the like, and any of these may be used. In addition, the material of the separation membrane preferably contains at least one selected from the group consisting of polyethylene, polypropylene, polyacrylonitrile, ethylene-tetrafluoroethylene copolymer, polychlorotrifluoroethylene, polytetrafluoroethylene, polyvinyl fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, chlorotrifluoroethylene-ethylene copolymer, polyvinylidene fluoride, polysulfone, cellulose acetate, polyvinyl alcohol, and inorganic materials such as polyethersulfone and ceramics, and further, polyvinylidene fluoride (PVDF) is more preferable in terms of membrane strength and chemical resistance, and polyacrylonitrile is more preferable in terms of high hydrophilicity and strong stain resistance.

[0017] Although the ultrafiltration membrane has been described so far, this membrane is generally inserted into a casing to form a module, and a plurality of modules are generally used to form a unit depending on the operating conditions (raw water state, amount of filtrate). The membrane filtration method may be a dead-end filtration module or a cross-flow filtration type, but the dead-end filtration type is preferable in terms of low energy consumption. Furthermore, either a pressurized type or an immersion type may be used, but the pressurized type is preferable in terms of high flux operation. Furthermore, either an external pressure type in which raw water is supplied from the outside of the membrane and permeated water is obtained from the inside, or an internal pressure type in which raw water is supplied from the inside of the membrane and permeated water is obtained from the outside, may be used, but the external pressure type is preferable in terms of ease of pretreatment.

[0018] FIG. 1 illustrates a pressurized type ultrafiltration membrane. In the case of a submerged separation membrane, although this is not illustrated, in order to filter the liquid to be treated with the submerged separation membrane, a pump or the like may be provided on the secondary side of the submerged membrane separation to perform suction, and since filtration is performed using the head pressure difference as the driving force, the liquid level in the filtration water tank may be made lower than the liquid level in the tank for the liquid to be treated.

[0019] In the case of submerged membrane separation, air cleaning is performed using air supplied continuously or intermittently from an air blower. Air is supplied from the air blower to the submerged membrane through an air diffuser installed at the bottom of the submerged separation membrane. The resulting parallel flow of liquid or gas-liquid mixed phase to the membrane surface separates suspended matter adhering to the membrane surface from the membrane surface. The normal operating sequence consists of a filtration process and a shutdown process, and it is common to continue air cleaning with an air blower during both processes while operating while separating suspended matter accumulated in the filtration process from the membrane surface during the shutdown process.

[0020] Here, the membrane used in the membrane element constituting the immersion-type separation membrane is not particularly limited, and may be either a flat membrane or a hollow fiber membrane. The structure of the membrane is not particularly limited, and may be, for example, any of a flat membrane element structure, a flat membrane element structure in which a flat membrane is wound in a spiral shape, a flat membrane pair having two flat membranes arranged so that their permeation sides face each other and a water collection channel provided between the flat membranes, a flat membrane element structure having flexibility and including a sealing part that seals the space between the flat membranes at the periphery of the flat membranes, and a hollow fiber membrane element structure in which a plurality of hollow fiber membranes are bundled together.

[0021] Reverse osmosis membranes are processed into reverse osmosis membrane elements and installed in equipment. There are spiral elements in which a flat membrane is wrapped around a water collection pipe, plate-and-frame elements in which flat membranes are attached to both sides of a plate-type support plate and stacked at regular intervals via spacers to form a module, tubular elements using tubular membranes, and hollow fiber membrane elements in which hollow fiber membranes are bundled and stored in a case. The element may be in any form, but from the viewpoint of operability and compatibility, it is preferable to use a spiral element. The number of elements can be set arbitrarily depending on the membrane performance. For example, polyamides, polypiperazine amides, polyester amides, or water-soluble vinyl polymers crosslinked can be used as the material, and the membrane structure can be one that has a dense layer on at least one side of the membrane, and has gradually larger pores from the dense layer to the inside of the membrane or the membrane on the other side (asymmetric membrane), or one that has a very thin separation function layer formed of another material on the dense layer of such an asymmetric membrane (composite membrane). However, for high water production capacity, composite membranes are preferred, and among them, polyamide composite membranes are more preferred from the standpoint of permeation capacity, chemical resistance, etc., and piperazine polyamide composite membranes are even more preferred.

[0022] The ultrafiltration membrane 2 is operated while periodically carrying out a physical cleaning process (backwashing, air cleaning, drainage, water supply) after a specified time of the filtration process to remove suspended solids (fouling) captured by the ultrafiltration membrane. For backwashing, the filtered water of the ultrafiltration membrane 2 is generally used, and the filtered water is backwashed by branching from a branch 6 of the filtered water wiring, or, although not shown, the filtered water is temporarily stored in a filtered water tank and sent to the ultrafiltration membrane by a backwash pump. In addition, an air cleaning blower 7 is installed for air cleaning. Although an air cleaning blower is shown in the figure, the air generating source may be a compressor, but in the case of a compressor, it is preferable that the compressor is an oil-free type so that oil in the air is not supplied to the separation membrane.

[0023] In addition, it is preferable to perform chemical enhanced backwashing (CEB) after repeating filtration and physical cleaning several times. CEB is performed by supplying chemicals to the backwash water using a backwash water chemical injection pump (not shown) during backwashing.

[0024] As the chemical solution, an aqueous solution containing a chemical such as hydrochloric acid, sulfuric acid, nitric acid, citric acid, oxalic acid, ascorbic acid, sodium hydrogen sulfite, sodium hydroxide, or sodium hypochlorite can be used. In particular, an oxidizing agent such as sodium hypochlorite is effective and useful for removing organic pollutants from seawater, river water, sewage treatment water, etc. The concentration of sodium hypochlorite is preferably 10 mg / L to 10,000 mg / L. If it is less than 10 mg / L, the cleaning effect is insufficient, and if it is more than 10,000 mg / L, the cost of the chemical becomes high and it becomes uneconomical. From this point of view, it is more preferable that the concentration is 100 mg / L to 5,000 mg / L.

[0025] After adding the chemical solution, a certain contact time is required to achieve a higher cleaning effect. The time for contacting the membrane with the chemical solution is preferably about 5 minutes to 3 hours. If the contact time is too short, the cleaning power is weak, and if it is too long, the device will be shut down for a long time, which will reduce the operating efficiency of the device and be economically disadvantageous.

[0026] Next, the filtered water from the ultrafiltration membrane 2 is pumped by a supply pump 8, pressurized by a high-pressure pump 9, and then supplied to the reverse osmosis membrane 3. Between the supply pump 8 and the high-pressure pump 9, chemicals such as a bactericide and a scale inhibitor are injected by a chemical injection device 10 to suppress fouling and scaling of the reverse osmosis membrane 3.

[0027] In addition, in the reverse osmosis membrane 3, when the raw water has a high salt concentration, such as in seawater desalination, the supply pressure may be boosted to about 8 MPa by the high-pressure pump 9 to obtain an effective osmotic pressure. In order to effectively utilize this energy, an energy recovery device 11 may be installed. The illustrated energy recovery device is a pressure exchange type, and is composed of an energy recovery device main body and a boost pump. This energy recovery device applies pressure to the concentrated water discharged from the reverse osmosis membrane 3, to the supply water to the reverse osmosis membrane branched at a branch 12 from the middle of the supply pump 8 and the high-pressure pump 9. The concentrated water from the reverse osmosis membrane 3 is discharged as concentrated water after pressure loss in the raw water side flow path of the reverse osmosis membrane 3, and is lower than the supply pressure to the reverse osmosis membrane 3 due to piping pressure loss in the concentrated water wiring and pressure loss in the energy recovery device. Even if pressure is applied to the supply water to the reverse osmosis membrane branched at the middle of the supply pump 8 and the high-pressure pump 9, the pressure will be lower than the discharge pressure of the high-pressure pump 9, so a boost pump is installed to boost the pressure. The pressurized feed water is then mixed at a mixer 13 between the high pressure pump 9 and the reverse osmosis membrane 3. Although a pressure exchange type is shown in the figure, a reverse pump type, a water wheel type, or a turbocharger type may also be used.

[0028] In this way, the flow of a water treatment process is composed of a combination of water flow (raw water, produced water, wastewater), water treatment devices (ultrafiltration membranes, reverse osmosis membranes (although not shown, sedimentation, flotation, centrifugation, coagulation, mixing, aerobic treatment, anaerobic treatment, filtration, squeezing, filter cloth, nanofiltration membranes, advanced oxidation, ion exchange, adsorption, absorption, deaeration, crystallization, distillation, heat exchange, and mineral addition may also be used)), energy recovery devices (reverse pump type, water wheel type, pressure exchange type, turbocharger), chemical injection devices, equipment (pumps, blowers, compressors, tanks), and piping connections (mixing, branching), and the water treatment process calculations are performed using these individually and in conjunction with each other.

[0029] Therefore, it is necessary to consider the required specifications while changing the treatment flow using these elements, and a water treatment process flow can be created and changed by arranging unit icons and connecting wiring between the unit icons that is oriented along the flow of the water treatment process.

[0030] Here, the unit icon means a water treatment unit process, and is characterized by at least one of the following: A. Water flow (raw water, produced water, wastewater) B. Water treatment equipment (sedimentation, flotation, centrifugation, coagulation, mixing, aerobic treatment, anaerobic treatment, sand filtration, squeezing, filter cloth, microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane, accelerated oxidation, ion exchange, adsorption, absorption, deaeration, crystallization, distillation, heat exchange, mineral addition) C. Energy recovery devices (reverse pump type, water wheel type, pressure exchange type, turbocharger) D. Chemical injection device E. Equipment (pumps, blowers, compressors, tanks) F. Piping connections (mixed, branched)

[0031] FIG. 2 is a flow diagram showing an example of a process calculation method for a water treatment process flow created by unit icons and wiring between the unit icons, and includes the following steps: A. determining the calculation order of the unit icons based on predetermined rules; after step BA, estimating at least one item of the flow rate, water quality, temperature, and water pressure of the treated water for each unit icon in accordance with the calculation order; after step CB, adjusting at least one item of the flow rate, water quality, temperature, and water pressure of the treated water estimated in step B so that no contradiction occurs in the material balance or energy balance for the water treatment process flow; and after step DC, determining whether or not steps B and C need to be repeatedly executed.

[0032] In addition, in the actual design of a water treatment process, the flow rate may be predetermined as a required specification, and the flow rate of each wiring may be determined so that no contradiction occurs in the flow rate balance before or after process A, as shown in Figure 3.

[0033] Similarly, there may be cases where the water quality, such as salt content, is predetermined as a required specification, and the water quality of each wiring may be determined so that no contradiction occurs in the water quality balance before or after the A process.

[0034] The rule for determining the calculation order of the A process is not particularly limited, and may be, for example, a rule for determining the calculation order based on the order in which the unit icons are arranged on the screen, a rule for determining the calculation order based on the order in which the user connects the wires, a rule for determining the calculation order based on the unit icon arranged at the top left of the screen moving to the bottom right, etc. An example of the rule for determining the calculation order of the A process will be described later.

[0035] Step B is a step of estimating at least one of the flow rate, water quality, temperature, and water pressure of the treated water, which are predetermined for each unit icon, and may include a step of determining predetermined calculation conditions and initial values ​​by user input, etc., before starting the water treatment process calculation, as necessary. Here, the predetermined calculation conditions and initial values ​​refer to, for example, the type and number of reverse osmosis membrane elements in the reverse osmosis membrane unit icon.

[0036] Here, for a unit icon with at least two or more inflow wirings such as mixed, in the first process calculation of the unit icon, the flow rate, water quality, temperature, and water pressure of at least one of the inflow wirings may be determined by input or calculation, and at least one of the flow rate, water quality, temperature, and water pressure of at least another inflow wiring may not be determined. In this case, it is possible to perform the water treatment process calculation of the unit icon by ignoring the inflow wiring for which one or more of the flow rate, water quality, temperature, and water pressure have not been determined, or by inputting some temporary value. However, if the deviation between the calculation result at this time and the final calculation result obtained by repeated calculation is too large, the water treatment process calculation may not converge or may take a long time to converge, so it is preferable to set the flow rate, water quality, temperature, and water pressure closer to the final calculation result. For example, one or more of the flow rate, water quality, temperature, and water pressure of the other inflow wiring for which the flow rate, water quality, temperature, and water pressure have been determined can be input to the inflow wiring for which one or more of the flow rate, water quality, temperature, and water pressure have not been determined.

[0037] Furthermore, as described above, when the flow rate of each wiring is determined before process B, it may be the case that the water quality, temperature, and water pressure of at least one inflow wiring have been determined by input or calculation, and one or more of the water quality, temperature, and water pressure of at least one other inflow wiring have not been determined. In this case, one or more of the water quality, temperature, and water pressure of the other inflow wiring, whose water quality, temperature, and water pressure have been determined, can be input into the inflow wiring for which one or more of the water quality, temperature, and water pressure have not been determined.

[0038] In process C, if there is a change in at least one of the items of flow rate, water quality, temperature, and water pressure in the wiring connected to one of the unit icons and the balance of flow rate, water quality, temperature, and water pressure in the unit icon connected to the other side of the wiring no longer matches, the material balance or energy balance is adjusted.

[0039] Here, cases where there is a change in at least one of the items of flow rate, water quality, temperature, and water pressure of the wiring connected to the unit icon are process B or process C itself, and by continuously adjusting the material balance or energy balance until the balance of flow rate, water quality, temperature, and water pressure is balanced for all arranged and connected unit icons, it is possible to ensure that there is no inconsistency in the material balance or energy balance of the entire water treatment process flow.

[0040] Here, a contradiction in the material balance or energy balance of a water treatment process flow or a unit icon refers to a state in which the error between the flow rate, or substances such as salts, or energy supplied to the entire system or each icon and the flow rate, or substances such as salts, or energy discharged from the entire system or each icon exceeds a predetermined specified value, and it can be determined that there is no contradiction when it falls below the predetermined specified value.

[0041] Furthermore, as mentioned above, in actual water treatment process designs, the flow rate may be predetermined as a required specification. Therefore, when the flow rate of the treated water changes, particularly in process B, it is preferable to adjust the flow rate of the raw water, the treated water, or both the raw water and the treated water so that no contradictions occur in the material balance for each unit icon in process C.

[0042] If the next step is proceeded to without resolving the contradiction in the material balance or energy balance of the water treatment process flow or the unit icon, an inappropriate initial value may be set in each unit icon, resulting in an inappropriate solution, an increased number of calculations until an appropriate solution is obtained, or the calculation may stop without a solution being obtained. Therefore, step C can contribute to improving the accuracy and speed of calculation.

[0043] In step D, it is sufficient to determine that the water treatment process calculation is terminated if the water treatment process calculation has reached a steady state, and that steps B and C are to be performed again if the steady state has not been reached; however, since this is generally applicable to any water treatment process, it is preferable to determine that repeated execution is required until at least one of the following, or both, is met: the error in the material balance of the water treatment process flow is below a predetermined specified value; or the difference between the estimated result of step B and the previous estimated result for at least one of the produced water unit icon and the wastewater unit icon is below a predetermined specified value.

[0044] An example of a rule for determining the calculation order of the A step will be described below.

[0045] As described above, the rules for determining the calculation order in process A are not particularly limited. However, since information on the water supplied to each unit icon other than the raw water needs to be received from a unit icon located upstream of the unit icon in question, it is preferable to have a rule for determining the calculation order in accordance with the direction of the wiring in order to prevent an inappropriate initial value from being set in process B, resulting in an inappropriate solution, an increase in the number of calculations required to obtain an appropriate solution, or the calculations stopping because no solution is obtained.

[0046] Furthermore, if there are unit icons that are not calculated in process B, there is a possibility that the balance of flow rate, water quality, temperature, or water pressure will not match in any of the unit icons or in the entire water treatment process flow, or that the user will not be able to obtain the solution he or she requires. Therefore, it is preferable to have rules that determine the calculation order for all unit icons that make up the water treatment process flow, without omissions.

[0047] Here, depending on the type of unit icon and its definition method, there may be a unit icon that does not require estimating any of the flow rate, water quality, temperature, and water pressure in process B. For example, if a produced water unit icon only receives the flow rate, water quality, temperature, and water pressure estimated in a unit icon located upstream of the produced water unit icon, the produced water unit icon does not need to estimate any of the flow rate, water quality, temperature, and water pressure in process B. In this case, there is no problem with the water treatment process calculation even if the calculation order is not set for the produced water unit, but this is synonymous with the case where the calculation order is set for the produced water unit icon while the processing of the produced water unit icon in process B does not change any of the flow rate, water quality, temperature, and water pressure, and in this embodiment, no distinction is made between these.

[0048] In addition, it is preferable to provide a rule for preventing the calculation order of one unit icon from overlapping with the calculation order of another unit icon, since there is a risk that the calculation order may be opposite to the wiring direction contrary to the above explanation, or that the calculation may not proceed because the unit icon to be calculated next after a certain unit icon is not determined in step B. Examples of the rule for preventing the overlapping of calculation orders include a rule for setting the calculation order in order from 1 so that overlaps do not occur, and a rule for setting a calculation order for one of the unit icons where the calculation order overlaps does not overlap with the calculation order set for another unit icon.

[0049] Furthermore, for the same reason as the rule for avoiding duplication of calculation orders, it is preferable to provide a rule for avoiding overwriting of a calculation order when the calculation order is set to a certain unit icon, except for the case where duplication is avoided when the calculation order is duplicated. For example, the rule for avoiding overwriting of the calculation order may be a rule for prohibiting the change of a calculation order once set to any unit icon, or a rule for returning the calculation order to the original calculation order when it is overwritten.

[0050] FIG. 4 is a flow diagram showing an example of a method for determining the calculation order of unit icons in Process A, which includes a rule for determining the calculation order according to the direction of wiring, a rule for determining the calculation order for all unit icons forming a water treatment process flow without omission, a rule for preventing the calculation order of one unit icon from overlapping with the calculation order of another unit icon, and a rule for preventing the calculation order from being overwritten when a calculation order is set for a unit icon. Process A is made up of the following processes A1 to A5.

[0051] Each process is as follows: A1. Select one of the raw water unit icons, set the calculation order of the selected raw water unit icon to "1", then deselect the raw water unit icon, select the unit icon one step downstream through the outflow wiring coming out of the raw water unit icon, and proceed to the A2 process below; A2. Set the calculation order of the unit icon selected in A1 or any of A4 and A5 described below to a value that is 1 plus the maximum value of the calculation order already set for all unit icons that form the water treatment process flow, and proceed to the A3 process below; A3. If the unit icon selected in A1 or any of A4 and A5 described below is not a produced water unit icon or a wastewater unit icon, proceed to the A4 process below, and A1 and the A4 process described below. A step of deselecting the unit icon selected in either step A4 or A5 if the unit icon selected is a produced water unit icon or a wastewater unit icon, and proceeding to step A5 below; A step of deselecting the unit icon selected in either step A4.A1 or step A4 or A5, passing through one of the outflow wirings exiting from the unit icon, selecting the unit icon one step downstream, and proceeding to step A2 below; A5. A step of selecting the unit icon into which the outflow wiring flows if there is an outflow wiring in the water treatment process flow that has not yet passed flowing out from the unit icon whose calculation order has been determined, and proceeding to step A2, and completing step A if there is no outflow wiring that has not yet passed flowing out from the unit icon whose calculation order has been determined.

[0052] Here, the A3 process skips the A4 process if there is no wiring downstream of the unit icon selected in any of the A1, A4, or A5 processes so that the A4 process does not become impossible to carry out. Examples of unit icons that do not have wiring downstream include the produced water unit icon and the drainage unit icon.

[0053] In addition, in step A4, when there are two or more outflow wirings downstream from a unit icon, such as a reverse osmosis membrane unit icon and a branch unit icon, it is preferable to determine in advance which outflow wiring to select from by a predetermined rule, for example, that in the case of a reverse osmosis membrane unit icon, the permeate is preferentially selected, which makes it possible to efficiently and completely determine the calculation order for all unit icons that make up the water treatment process flow.

[0054] In addition, in step A5, if there are multiple unpassed outgoing wirings flowing out from a unit icon for which the calculation order has already been determined, any one of the unit icons to which the relevant outgoing wiring is connected as an incoming wiring may be selected. However, it is more preferable to predefine a predetermined rule, for example, a rule to preferentially select a unit icon into which a wiring flowing out from a unit icon installed further upstream flows, as this enables the process to proceed to the next step more quickly.

[0055] Fig. 7 is a flow diagram showing an example of a water treatment process according to this embodiment, and an example of a method for determining the calculation order of unit icons in steps A1 to A5 will be described with reference to Fig. 7. Here, in step A4, a rule is set such that, among permeated water and concentrated water of the reverse osmosis membrane unit icon, the permeated water is preferentially selected.

[0056] In this case, first, in process A1: "A1. Select one of the raw water unit icons, set the calculation order of the selected raw water unit icon to "1", then deselect the raw water unit icon, pass through the outflow wiring coming out of the raw water unit icon and select the unit icon one step downstream, and proceed to process A2 below", raw water unit icon 1 is selected, the calculation order is determined as "1", selection moves from raw water unit icon 1 to high-pressure pump unit icon 9, and proceeds to process A2.

[0057] Next, in step A2: "A step of adding 1 to the maximum value of the calculation order already set for all unit icons forming the water treatment process flow as the calculation order of the unit icon selected in steps A2.A1 or A4 or A5 described below, and proceeding to step A3 below", the calculation order of the high-pressure pump unit icon 9 is determined to be "2", which is the maximum calculation order up to that point plus 1, and processing proceeds to step A3.

[0058] Next, in step A3: "A step of transitioning to step A4 below if the unit icon selected in step A3.A1 or any of steps A4 and A5 described below is not a produced water unit icon or a drainage unit icon, and transitioning to step A5 below if the unit icon selected in step A1 or any of steps A4 and A5 described below is a produced water unit icon or a drainage unit icon," since the high-pressure pump unit icon 9 is neither produced water nor drainage water, transition is made to step A4.

[0059] Next, in step A4: "A step of deselecting the unit icon selected in step A4.A1 or any one of steps A4 and A5, passing through one of the outflow wirings coming out of the unit icon, selecting the unit icon one step downstream, and proceeding to step A2 described below," the selection moves from the high-pressure pump unit icon 9 to the reverse osmosis membrane unit icon 3, and the process returns to step A2.

[0060] Similarly, by repeating steps A2, A3, and A4, the calculation order of the reverse osmosis membrane unit icon 3 is successively determined to be "3," the calculation order of the product water unit icon 4 is successively determined to be "4," and so on.

[0061] In step A3 immediately after the calculation order of the produced water unit icon 4 is determined, the selected unit icon is the produced water, so after the selection of the produced water unit icon 4 is deselected, the process moves to step A5.

[0062] Next, in step A5: "A5. If there is an unpassed outflow wiring flowing out from a unit icon for which the calculation order has been determined in the water treatment process flow, select the unit icon into which the outflow wiring flows and proceed to step A2, and if there is no unpassed outflow wiring flowing out from a unit icon for which the calculation order has been determined, terminate step A," since the reverse osmosis membrane unit icon 3 corresponds to the case in step A5 where "there is an unpassed outflow wiring flowing out from a unit icon for which the calculation order has been determined," the unit icon into which the unpassed outflow wiring flows, i.e., the drainage unit icon 14, is selected, and step A2 is resumed.

[0063] After the calculation order of the drainage unit icon 14 is determined to be "5" by step A2, the process goes through step A3 to step A5 in the same manner as when the produced water unit icon 4 is selected.

[0064] At this point, the case applies in process A5 where "there are no unpassed outflow wiring flowing out from the unit icon for which the calculation order has been determined", so process A ends here and the unit icon calculation order of the unit icons that make up Figure 7 is as follows: raw water unit icon 1: "1", high-pressure pump unit icon 9: "2", reverse osmosis membrane unit icon 3: "3", produced water unit icon 4: "4", drainage unit icon 14: "5".

[0065] Fig. 5 is a flow chart showing another example of a method for determining the calculation order of the unit icons in step A, which includes a rule for determining the calculation order according to the direction of the wiring, a rule for determining the calculation order for all unit icons forming the water treatment process flow without omission, a rule for preventing the calculation order of one unit icon from overlapping with the calculation order of another unit icon, and a rule for preventing the calculation order from being overwritten when the calculation order is set for one unit icon, as in Fig. 4. This determination method includes a step A6 between steps A4 and A2 in Fig. 4, which transitions to step A5 if the calculation order of the unit icon selected in any of steps A1, A4, and A5 has been determined, and transitions to step A2 if the calculation order of the unit icon selected in any of steps A1, A4, and A5 has not been determined, so as not to violate the above-mentioned rules even in a water treatment process flow including wiring with a more complicated circulation, and in A5, if there is an outgoing wiring that has not yet passed out of the unit icon whose calculation order has been determined, the unit icon into which the outgoing wiring flows is selected and transitions to step A6.

[0066] FIG. 8 is a flow chart showing another example of the water treatment process of this embodiment, and an example of a method for determining the unit icon calculation order in steps A1 to A6 will be described with reference to FIG.

[0067] As in the case of Figure 7, in the A4 process, the rule is that the permeate and concentrated water of the reverse osmosis membrane unit icon are to be preferentially selected, and further, in the A4 process, the rule is that the right outflow wiring is to be preferentially selected between the right and left outflow wiring of the branch unit icon 12, and further, in the A5 process, the rule is that the unit icon into which the wiring flowing out from the unit icon installed further upstream is to be preferentially selected.

[0068] At this time, similarly to the case of FIG. 7, the calculation orders of the raw water unit icon 1 and the subsequent mixing unit icon 13 are determined to be "1" and "2", respectively, by steps A1 and A2.

[0069] Furthermore, after passing through steps A3 and A4, the process proceeds to step A6, in which the first high pressure pump unit icon 15 is selected and the process proceeds to step A5 if the calculation order of the unit icon selected in any of steps A1, A4, and A5 has been determined, and the process proceeds to step A2 if the calculation order of the unit icon selected in any of steps A1, A4, and A5 has not been determined. At this time, the first high pressure pump unit icon 15 corresponds to the case of "the calculation order of the unit icon selected in any of steps A1, A4, and A5 has not been determined" in step A6, and therefore the process proceeds to step A2.

[0070] Similarly, by repeating steps A2, A3, A4, and A6, the calculation order of the first high-pressure pump unit icon 15, the first reverse osmosis membrane unit icon 17, the second high-pressure pump unit icon 16, the second reverse osmosis membrane unit icon 18, and the first product water unit icon 19 is determined to be "3," "4," "5," "6," and "7," respectively.

[0071] In step A3 immediately after the calculation order of the first product water unit icon 19 is determined, since the first product water unit icon 19 is a product water unit icon, selection of the first product water unit icon 19 is cancelled and the process moves to step A5.

[0072] Here, in the case in step A5 where "there is unpassed outflow wiring flowing out from the unit icon for which the calculation order has been determined," two such icons apply: the first reverse osmosis membrane unit icon 17 and the second reverse osmosis membrane unit icon 18. As described above, the rule is to preferentially select the unit icon into which the wiring flowing out from the unit icon installed further upstream flows in, so at this point in time, the drainage unit icon 14 into which the concentrated water of the first reverse osmosis membrane unit icon 17 flows in is selected, and the process moves to step A6.

[0073] At this time, the calculation order of the drainage unit icon 14 has not been determined, so the process proceeds to step A2, where the calculation order of the drainage unit icon 14 is determined to be "8," and the selection of the drainage unit icon 14 is deselected in the subsequent step A3, and the process proceeds to step A5.

[0074] At this point in time, the only unit icon that corresponds to the case in step A5 where "there is an unpassed outflow wiring flowing out from the unit icon whose calculation order has been determined" is the second reverse osmosis membrane unit icon 18, so the branch unit icon 12 into which the concentrated water of the second reverse osmosis membrane unit icon 18 flows is selected, and the process proceeds to step A6.

[0075] Here, since the rule has been established that "between the right and left exit wiring of the branching unit icon 12, the right exit wiring is selected preferentially," the calculation orders of the branching unit icon 12 and the second product water unit icon 20 are determined to be "9" and "10," respectively, by going through steps A6, A2, A3, A4, A6, and A2 in order.

[0076] Next, in step A3, since the second product water unit icon 20 is product water, the selection of the second product water unit icon 20 is cancelled and the process moves to step A5. At this time, since the branch unit icon corresponds to the case in step A5 where there is an unpassed outgoing wiring flowing out from the unit icon whose calculation order has been determined, the mixed unit icon 13 into which the outgoing wiring to the left of the branch unit icon flows is selected and the process moves to step A6.

[0077] Here, the calculation order of the mixed unit icon 13 has already been determined as "2," and since this corresponds to the case in which "the calculation order of the unit icon selected in any of steps A1, A4, or A5 has been determined" in step A6, the process moves to step A5.

[0078] At this point, the case applies in process A5 where "there are no unpassed outflow wiring flowing out from the unit icon for which the calculation order has been determined", so process A ends here, and an example of the unit icon calculation order for the unit icons that make up Figure 8 is as follows: raw water unit icon 1: "1", mixing unit icon 13: "2", first high-pressure pump unit icon 15: "3", first reverse osmosis membrane unit icon 17: "4", second high-pressure pump unit icon 16: "5", second reverse osmosis membrane unit icon 18: "6", first produced water unit icon 19: "7", drainage unit icon 14: "8", branching unit icon 12: "9", second produced water unit icon 20: "10".

[0079] Fig. 6 is a flow chart showing another example of a method for determining the calculation order of unit icons in step A, which includes a rule for determining the calculation order according to the direction of wiring, a rule for determining the calculation order for all unit icons forming the water treatment process flow without omission, a rule for preventing the calculation order of one unit icon from overlapping with the calculation order of another unit icon, and a rule for preventing the calculation order from being overwritten when a calculation order is set for one unit icon, as in Fig. 4 and Fig. 5. This calculation method includes step A7 in Fig. 5, which selects a raw water unit icon for which the calculation order has not been determined and transitions to step A2 if there is a raw water unit icon for which the calculation order has not been determined, and terminates step A if there is no raw water unit icon for which the calculation order has not been determined, and each of steps A2, A3, A4, and A6 targets the unit icon selected in any of steps A1, A4, A5, and A7, so as not to violate the above rules even when the water treatment process flow includes two or more raw water unit icons.

[0080] FIG. 9 is a flow chart showing another example of the water treatment process of this embodiment, and an example of a method for determining the unit icon calculation order in steps A1 to A7 will be described with reference to FIG.

[0081] As in the case of Figure 8, in the A4 process, the rule is that the permeate and concentrated water of the reverse osmosis membrane unit icon will preferentially select the permeate, in the A4 process, the rule is that the right outflow wiring will preferentially select the right outflow wiring of the branch unit icon 12 as between the right and left outflow wiring, and in the A5 process, the rule is that the wiring flowing out from the unit icon installed further upstream will preferentially select the unit icon into which it flows.

[0082] In this case, as in the case of Figure 8, the calculation order is determined by each of the processes A1, A2, A3, A4, A5, and A6 as follows: first raw water unit icon 21: "1", first mixing unit icon 23: "2", second mixing unit icon 24: "3", first high-pressure pump unit icon 15: "4", first reverse osmosis membrane unit icon 17: "5", second high-pressure pump unit icon 16: "6", second reverse osmosis membrane unit icon 18: "7", first product water unit icon 19: "8", drainage unit icon 14: "9", branching unit icon 12: "10", second product water unit icon 20: "11".

[0083] In step A5 after the calculation order of the second produced water unit icon 20 has been determined, the case corresponds to "the case where there are no unpassed outflow wiring flowing out from the unit icon whose calculation order has been determined" in step A5, so the process proceeds to step A7, "a process of selecting a raw water unit icon for which the calculation order has not been determined if there is a raw water unit icon for which the calculation order has not been determined, and proceeding to step A2, and ending step A if there are no raw water unit icons for which the calculation order has not been determined." Since the second raw water unit icon 22 corresponds to "the case where a raw water unit icon for which the calculation order has not been determined exists" in step A7, the second raw water unit icon 22 is selected and the process proceeds to step A2.

[0084] After the calculation order of the second raw water unit icon 22 is determined to be "12" in step A2, it moves on to steps A3, A5, and A7 in that order. At this point, since the case in step A7 corresponds to "there is no raw water unit icon for which the calculation order has not been determined," step A is terminated, and an example of the unit icon calculation order of the unit icons constituting Figure 9 is as follows: first raw water unit icon: "1", first mixing unit icon: "2", second mixing unit icon: "3", first high-pressure pump unit icon: "4", first reverse osmosis membrane unit icon: "5", second high-pressure pump unit icon: "6", second reverse osmosis membrane unit icon: "7", first produced water unit icon: "8", drainage unit icon: "9", branching unit icon: "10", second produced water unit icon: "11", second raw water unit icon: "12".

[0085] In this way, process A, which is composed of one or more of processes A1 to A7, can quickly and thoroughly determine the calculation order for all unit icons that form the water treatment process flow, from the raw water toward the downstream side, thereby contributing to improving the calculation accuracy and speed of the entire water treatment process calculation.

[0086] As shown in the schematic diagram of a system configuration as an example of an embodiment of the present invention in Fig. 10, the water treatment process calculation method may be stored in a computer-readable recording medium on which the program is recorded, as a program that can be read by a computer 30. In this case, the water treatment process calculation program is stored in a recording medium such as the computer's hard disk.

[0087] As an example, the computer 30 includes a water treatment process calculation program 31, a water treatment process input means 32, a water treatment process storage means 33, a water treatment process calculation result storage means 41, and a water treatment process calculation result output means 42. The water treatment process calculation program 31 is also composed of a water treatment process reading means 34, a unit icon calculation order determining means 35, a unit icon calculation order determining rule storage means 36, a unit icon calculation means 37, a material or energy balance calculation means 38, a convergence determination means 39, and a water treatment process calculation result saving means 40.

[0088] As shown in the schematic diagram of a system configuration that is another example of an embodiment of the present invention in FIG. 11, the system that stores the recording medium may be a server 44 such as an on-premise server or a cloud server.

[0089] In the example of Fig. 11, the entire system is composed of a computer 30 and a server 44. The computer 30 is equipped with a water treatment process input means 32, a water treatment process calculation result output means 42, and a browser 43 that enables access to these. The server 44 is equipped with a water treatment process calculation program 31, a water treatment process storage means 33, and a water treatment process calculation result storage means 41. The configuration of the water treatment process calculation program 31 is the same as that of Fig. 10.

[0090] In this way, when the water treatment process calculation program is stored in the server 44, it is even more preferable to configure a system in which the program is accessed via the browser 43 on the computer 30 and the water treatment process calculation program is executed to perform calculations.

[0091] This application is based on a Japanese patent application (Patent Application No. 2023-11786) filed on January 30, 2023, the contents of which are incorporated by reference into this application. [Explanation of symbols]

[0092] 1: Raw water 2: Ultrafiltration membrane 3: Reverse osmosis membrane 4: Produced water 5: Raw water pump 6: Filtrate water branch 7: Air washing blower 8: Supply pump 9: High pressure pump 10: Chemical injection device 11: Energy recovery device 12: Branching 13: Mixed 14: Drainage 15: First high pressure pump 16: Second high pressure pump 17: First reverse osmosis membrane 18:Second reverse osmosis membrane 19: First produced water 20: Secondary production water 21: Daiichi Gensui 22: Second raw water 23:First mixture 24:Second mixture 30: Computer 31: Water treatment process calculation program 32: Water treatment process input means 33: Water treatment process storage means 34: Water treatment process reading means 35: Unit icon calculation order determination means 36: Unit icon calculation order determination rule storage means 37: Unit icon calculation means 38:Material or energy balance calculation tool 39: Convergence judgment means 40: Means for storing water treatment process calculation results 41: Water treatment process calculation result storage means 42: Means for outputting water treatment process calculation results 43: Browser 44: Server

Claims

1. A process calculation method for a water treatment process having a plurality of water treatment unit processes, comprising: A process calculation method for a water treatment process, characterized in that a water treatment process flow formed by a process of arranging unit icons of water treatment unit processes and wiring between the unit icons includes at least one raw water unit icon, one produced water unit icon, and one wastewater unit icon, and comprises the following steps A to D. A. A process for determining the calculation order of the unit icons, including the following steps A1 to A5: A1. A process of selecting one of the raw water unit icons, setting "1" in the calculation order of the selected raw water unit icon, deselecting the raw water unit icon, passing through the outflow wiring coming out of the raw water unit icon and selecting the unit icon one downstream, and proceeding to the following A2 process. A2. A step of setting the calculation order of the unit icon selected in the step A1 or any one of the steps A4 and A5 described below to a value obtained by adding 1 to the maximum value of the calculation order already set for all the unit icons forming the water treatment process flow, and proceeding to the step A3 described below. A step of moving to the step A4 below if the unit icon selected in the step A1 or any of the steps A4 and A5 described later is not the produced water unit icon or the drainage unit icon, and deselecting the unit icon and moving to the step A5 below if the unit icon selected in the step A1 or any of the steps A4 and A5 described later is the produced water unit icon or the drainage unit icon A4. A process of canceling the selection of the unit icon selected in any one of the processes A1, A4, and A5 described later, passing through one of the outflow wirings coming out of the unit icon, selecting the unit icon one downstream, and moving to the process A2. A5. A step of selecting a unit icon into which an outgoing wiring flows in the water treatment process flow when the outgoing wiring has not yet passed out of the unit icon whose calculation order has been determined, and proceeding to the step A2 when the outgoing wiring has not yet passed out of the unit icon whose calculation order has been determined. B. After the step A, a step of estimating at least one of the flow rate, water quality, temperature, and water pressure of the treated water for each of the unit icons according to the calculation order. C. After the step B, a step of adjusting at least one of the flow rate, water quality, temperature, and water pressure of the raw water or treated water estimated in the step B so that no contradiction occurs in the material balance or energy balance of the water treatment process flow. D. A step of determining whether or not the steps B and C are to be repeatedly performed after the step C.

2. Before or after the step of determining the calculation order of the unit icons in the step A, calculating a flow balance for the water treatment process flow; Or calculating a water quality balance for the water treatment process flow; At least one of the following is provided: The process calculation method for a water treatment process according to claim 1 .

3. When the flow rate of the treated water is estimated in the step B, In the C step, adjusting the flow rate of the raw water or the treated water so that an error in material balance for each unit icon is equal to or less than a predetermined specified value; The process calculation method for a water treatment process according to claim 1 .

4. In the step of estimating at least one of the flow rate, water quality, temperature, and water pressure of the treated water for each unit icon according to the calculation order of the step B, When the water treatment process flow includes a mixing unit icon having at least two inlet lines, And, when the flow rate, water quality, temperature, and water pressure of at least one of the inflow wirings of the unit icon is determined by input or calculation, and at least one of the flow rate, water quality, temperature, and water pressure of another inflow wiring is not determined, Inputting one or more of the flow rate, water quality, temperature, and water pressure of the inflow wiring, the flow rate, water quality, temperature, and water pressure of which have been determined, into the inflow wiring, the one or more of which have not been determined, and estimating at least one of the flow rate, water quality, temperature, and water pressure of the treated water; The process calculation method for a water treatment process according to claim 1 .

5. 2. The process calculation method for a water treatment process according to claim 1, wherein the unit icon is at least one of the following:

1. Water flow (raw water, produced water, wastewater) 2. Water treatment equipment (sedimentation, flotation, centrifugation, coagulation, mixing, aerobic treatment, anaerobic treatment, filtration, squeezing, filter cloth, microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane, accelerated oxidation, ion exchange, adsorption, absorption, degassing, crystallization, distillation, heat exchange, mineral addition) 3. Energy recovery devices (reverse pump type, water wheel type, pressure exchange type, turbocharger) 4. Chemical injection device 5. Deaeration device 6. Equipment (pumps, blowers, compressors) 7. Piping connections (mixed, branched)

6. When the water treatment process flow is provided with a circulation line, The following A6 step is performed after the A4 step, In the step A5, when there is an unpassed outgoing trace flowing out from the unit icon whose calculation order has been determined, the step A6 is performed by selecting a unit icon into which the outgoing trace flows. The process calculation method for a water treatment process according to claim 1 . A6. When the calculation order of the unit icon selected in any one of the steps A1, A4, and A5 is determined, proceed to the step A5; A step of moving to the step A2 when the calculation order of the unit icon selected in any one of the steps A1, A4, and A5 has not been determined.

7. When the water treatment process flow includes two or more raw water unit icons, In the step A5, The process includes the following step A7 to which the process proceeds when there is no unit icon whose calculation order has not been determined one step downstream of the unit icon whose calculation order has been determined, Each of the steps A2, A3, A4, and A6 is directed to a unit icon selected in any of the steps A1, A4, A5, and A7. The process calculation method for a water treatment process according to claim 6. A7. When the raw water unit icon for which the calculation order has not been determined is present in the water treatment process flow, select the icon and proceed to step A2; a step of terminating the step A when there is no raw water unit icon for which the calculation order has not been determined;

8. In the step of determining whether or not the step B and the step C are to be repeatedly performed in the step of the step D, When the error in the mass balance of the water treatment process flow is equal to or less than a predetermined specified value, When the difference between the estimation result of the B process and the previous estimation result in at least one of the produced water unit icon and the drainage unit icon is equal to or less than a predetermined specified value, and determining that the execution is required repeatedly until at least one or both of the following conditions are satisfied. The process calculation method for a water treatment process according to claim 1 .

9. A computer for performing process calculations for a water treatment process having a plurality of water treatment unit processes, a water treatment process flow formed by a water treatment process flow input means for arranging unit icons of water treatment unit processes and wiring between the unit icons and stored in a water treatment process flow storage means, the water treatment process includes at least one raw water unit icon and one produced water unit icon or one drainage unit icon; A water treatment calculation program characterized by functioning as a means for reading the water treatment process flow from the water treatment process flow storage means for use in each of the following means A to D. A. A means for determining the calculation order of the unit icons, which comprises the following means A1 to A5, which are stored in advance in a unit icon calculation order determination rule storage means: A1. A means for selecting one of the raw water unit icons, setting "1" in the calculation order of the selected raw water unit icon, and then canceling the selection of the raw water unit icon, passing through the outflow wiring coming out of the raw water unit icon and selecting the unit icon one downstream, and transitioning to the following A2 means. A2. A means for setting a value obtained by adding 1 to the maximum value of the calculation order already set for all the unit icons forming the water treatment process flow as the calculation order of the unit icon selected in the means A1 or any one of the means A4 and A5 described below, and transitioning to the means A3 described below. A3. A means for transitioning to the below-mentioned A4 means when the unit icon selected in the above A1 or any of the means A4 and A5 described later is not the produced water unit icon or the drainage unit icon, and for deselecting the unit icon and transitioning to the below-mentioned A5 means when the unit icon selected in the above A1 or any of the means A4 and A5 described later is the produced water unit icon or the drainage unit icon A4. A means for canceling the selection of a unit icon selected in any one of the means A1, A4, and A5 described later, passing through one of the outflow wirings coming out of the unit icon, selecting a unit icon one downstream, and shifting to the means A2. A5. A means for selecting a unit icon into which the outgoing wiring flows when there is an outgoing wiring that has not yet passed out of the unit icon whose calculation order has been determined in the water treatment process flow, and transitioning to the A2 means, and for terminating the A means when there is no outgoing wiring that has not yet passed out of the unit icon whose calculation order has been determined. B. A means for estimating at least one of the flow rate, water quality, temperature, and water pressure of the treated water for each of the unit icons in accordance with the calculation order. C. A means for adjusting at least one of the flow rate, water quality, temperature, and water pressure of the raw water or treated water, which are estimated by the means B, so that no contradiction occurs in the material balance or energy balance of the water treatment process flow. D. A means for determining whether or not the B means and the C means need to be repeatedly executed; A means for storing the water treatment process calculation results in a water treatment process calculation result storage means for use in the water treatment process calculation result output means.

10. before or after the means for determining the calculation order of the unit icons of the A means, means for calculating a flow balance for said water treatment process flow; or means for calculating a water quality balance for said water treatment process flow; The water treatment calculation program according to claim 9, further causing the computer to function as at least one of the above.

11. When the flow rate of the treated water is estimated in the B means, The C means adjusts the flow rate of the raw water or the treated water so that the error in the material balance for each of the unit icons is equal to or smaller than a predetermined specified value.

10. The water treatment calculation program according to claim 9.

12. A means for estimating at least one of the flow rate, water quality, temperature, and water pressure of the treated water for each unit icon in accordance with the calculation order of the means B, When the water treatment process flow includes a mixed unit icon having at least two or more inflow lines, and the flow rate, water quality, temperature, and water pressure of at least one of the inflow lines of the unit icon are determined by input or calculation, and at least one of the flow rate, water quality, temperature, and water pressure of at least another inflow line is not determined, The present invention is characterized in that at least one of the flow rate, water quality, temperature, and water pressure of the treated water is estimated by inputting one or more of the flow rate, water quality, temperature, and water pressure of the inflow wiring, the flow rate, water quality, temperature, and water pressure of which are determined, into the inflow wiring, the flow rate, water quality, temperature, and water pressure of which are not determined. The water treatment calculation program according to claim 9.

13. The unit icon is at least one of the following: The water treatment calculation program according to claim 9.

1. Water flow (raw water, produced water, wastewater) 2. Water treatment equipment (sedimentation, flotation, centrifugation, coagulation, mixing, aerobic treatment, anaerobic treatment, filtration, squeezing, filter cloth, microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane, accelerated oxidation, ion exchange, adsorption, absorption, degassing, crystallization, distillation, heat exchange, mineral addition) 3. Energy recovery devices (reverse pump type, water wheel type, pressure exchange type, turbocharger) 4. Chemical injection device 5. Deaeration device 6. Equipment (pumps, blowers, compressors) 7. Piping connections (mixed, branched)

14. When the water treatment process flow is provided with a circulation line, After the A4 means, the computer is further caused to function as the following A6 means, said A5 means, when there is an unpassed outgoing trace flowing out from the unit icon for which the calculation order has been determined, selects a unit icon into which the outgoing trace flows and transitions to said A6 means; The water treatment calculation program according to claim 9. A6. A means for shifting to the A5 means when the calculation order of the unit icon selected in any one of the means A1, A4, and A5 has been determined, and for shifting to the A2 means when the calculation order of the unit icon selected in any one of the means A1, A4, and A5 has not been determined.

15. When the water treatment process flow includes two or more raw water unit icons, The A5 means causes the computer to further function as the following A7 means for transitioning when there is no unit icon whose calculation order has not been determined one downstream of the unit icon whose calculation order has been determined, Each of the means A2, A3, A4, and A6 is directed to a unit icon selected in any of the means A1, A4, A5, and A7. The water treatment calculation program according to claim 14. A7. When the raw water unit icon for which the calculation order has not been determined is present in the water treatment process flow, the icon is selected and the process proceeds to the A2 means; means for terminating the means A when there is no raw water unit icon for which the calculation order has not been determined;

16. The D means is When the error in the mass balance of the water treatment process flow is equal to or less than a predetermined specified value, When the difference between the estimation result of the B means and the previous estimation result for at least one of the produced water unit icon and the drainage unit icon is equal to or less than a predetermined specified value, and determining that the B means and the C means need to be repeatedly executed until at least one or both of the following conditions are satisfied. The water treatment calculation program according to claim 9.

17. A computer-readable recording medium having recorded thereon the water treatment calculation program according to any one of claims 9 to 16.

18. 18. A water treatment process calculation system, wherein the recording medium according to claim 17 is a server, and the server can be accessed via a browser to perform calculations of a water treatment process.

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