JP7282730B2 - Wastewater treatment method and wastewater treatment equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wastewater treatment method and a wastewater treatment apparatus.

Industrial wastewater generated in various factories such as food processing factories, food manufacturing factories, beverage production factories, machine factories, automobile factories, etc., or kitchen wastewater generated in various facilities such as shopping centers, restaurants, supermarkets, hotels, hospital kitchens, etc. contains organic matter. Conventionally, water treatment has been carried out to remove organic substances contained in these wastewaters, detoxify them, and discharge them. Indicators for evaluating the quality of waste water include biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), pH, etc. It has been known.

FIG. 10 shows an example of a conventional wastewater treatment flow from a production plant. Wastewater discharged from the production plant is supplied to the regulating tank, and after being stored for a certain period of time while supplying agitation air as necessary to equalize the amount and quality of the wastewater, it is sent to the wastewater treatment facility.

However, the conventional method of installing an adjustment tank to equalize the amount and quality of water has the following problems.
(1) When receiving wastewater with large fluctuations in water quality, it is necessary to store the wastewater in the adjustment tank for about 24 hours to sufficiently homogenize the water quality before transferring it to the wastewater treatment facility. Therefore, it becomes necessary to install a relatively large-capacity regulating tank so that the capacity of the regulating tank can cover a day's worth of wastewater, requiring a large site area and high construction costs.
(2) If the capacity of the regulating tank cannot be increased, it will be difficult for the regulating tank to mitigate fluctuations in the amount and quality of the waste water, which may lead to deterioration of the treated water quality in the subsequent waste water treatment.
(3) For the purpose of improving the quality of treated water in the subsequent wastewater treatment, it is conceivable to provide a new facility separately, but the operation and management work of the wastewater treatment facility becomes more complicated.

By the way, the amount and quality of waste water generated in various factories or facilities may vary greatly depending on the items of production, production processes, and the like. For example, in a production factory that produces beverages, the production line is cleaned when switching production items. Washing may be performed multiple times a day, and may generate waste water with a BOD concentration that is about 2.8 times higher than that during normal beverage production, and about 50 times higher in terms of water volume per hour.

If a conventional wastewater treatment facility is to accept and treat such wastewater with large fluctuations in water volume and concentration, the treatment conditions of the wastewater treatment facility will need to be significantly changed. As a result, the wastewater treatment facility cannot follow changes in treatment conditions, and inadequately treated wastewater is discharged. In particular, when biological treatment is used for wastewater treatment equipment, the amount of organic matter that can be treated is determined to some extent with respect to the amount of microorganisms. Microorganisms themselves used for biological treatment do not rapidly increase in response to sudden changes in the properties of wastewater. Therefore, if the amount of organic matter in the inflowing wastewater increases rapidly, the organic matter cannot be sufficiently removed by biological treatment, and the quality of the treated water deteriorates.

As one of the methods for solving the above problem, for example, in Japanese Patent Application Laid-Open No. 8-267089 (Patent Document 1), the pH of the denitrification tank (reaction tank) is measured against the load fluctuation of the influent wastewater, and the result A method of adjusting the amount of influent wastewater and obtaining a stable denitrification reaction has been proposed.

In Japanese Patent Laid-Open No. 2015-155097 (Patent Document 2), among wastewater discharged from a manufacturing process, wastewater containing high-concentration organic chemicals is introduced into a high-concentration wastewater treatment line, and low-concentration organic chemicals are treated. A method of introducing wastewater containing is introduced into a low concentration wastewater treatment line is proposed.

JP-A-8-267089 JP 2015-155097 A

The method described in Patent Document 1 is characterized by performing stable denitrification wastewater treatment by controlling the amount of influent wastewater supplied to the reaction tank according to the pH in the reaction tank for biological treatment. I'm trying. However, the measured pH value in the reaction tank is affected by both the pH change of the influent wastewater itself and the pH change due to the biological treatment in the reaction tank. It may be difficult to determine whether it indicates an increase in the numerical value due to nitrogen reaction or an increase in the numerical value of the influent wastewater itself.

In the method described in Patent Document 2, wastewater containing high-concentration organic chemicals, wastewater containing low-concentration organic chemicals, and wastewater containing inorganic chemicals are each treated appropriately. This makes wastewater treatment more efficient. However, even in the method described in Patent Document 2, no countermeasures against sudden changes in the properties of waste water have been considered.

In view of the above problems, the present invention provides a wastewater treatment method and a wastewater treatment apparatus capable of equalizing sudden changes in the properties of wastewater discharged from production facilities with a smaller and simpler facility and realizing stable wastewater treatment at all times. I will provide a.

In order to solve the above problems, as a result of intensive studies by the present inventors, the concentration of wastewater generated from a production plant is measured in response to input of production information including at least production items and production processes from production equipment, Based on the concentration measurement results, it was found that it is effective to distribute and store the wastewater in a plurality of adjustment tanks in order to equalize the quality and quantity of the wastewater.

In one aspect of the embodiment of the present invention completed on the basis of the above knowledge, the concentration of wastewater from the production facility is measured in response to input of production information including at least the production item and the production process from the production facility, Distribute wastewater to a plurality of adjustment tanks based on the concentration measurement value of the wastewater and a predetermined concentration standard value, store the wastewater in the adjustment tank to equalize the water quality and concentration of the wastewater, and store the wastewater in the adjustment tank. a wastewater treatment method comprising feeding the treated wastewater to a biotreatable wastewater treatment facility.

In one embodiment of the wastewater treatment method according to the embodiment of the present invention, when the measured concentration value is equal to or higher than the concentration standard value, the wastewater is distributed to at least the first adjustment tank and the second adjustment tank, and then the second While adjusting the transfer amount of the wastewater in the first adjustment tank to the second adjustment tank, store the wastewater so that the concentration of the wastewater in the second adjustment tank is within the specified concentration range, and measure the concentration of the wastewater. When the value is less than the concentration standard value, the wastewater is distributed to the second adjustment tank and stored so that the concentration of the wastewater in the second adjustment tank is within the specified concentration range. and feeding the waste water in the second adjustment tank adjusted to the waste water treatment facility.

In another embodiment of the wastewater treatment method according to the embodiment of the present invention, when the measured concentration value is equal to or higher than the concentration standard value, the wastewater is distributed to the first adjustment tank and stored, and then the first The wastewater stored in the adjustment tank is sent to wastewater treatment equipment that performs at least aeration and biological treatment, and when the measured concentration value is less than the concentration standard value, the wastewater is distributed to the second adjustment tank. Then, the waste water stored in the second adjustment tank is fed to a waste water treatment facility that performs at least biological treatment.

In still another embodiment of the wastewater treatment method according to the embodiment of the present invention, the concentration of wastewater from the production facility is measured in response to input of production information including at least production items and production processes from the production facility. , when the measured concentration of the waste water is equal to or higher than the predetermined concentration standard value, the waste water is stored in the first adjustment tank, and then at least biological treatment is performed on the waste water stored in the first adjustment tank. After that, the wastewater after biological treatment is sent to the neutralization tank for neutralization treatment, and when the measured concentration value of the wastewater is less than the concentration standard value, the wastewater from the production facility is sent to the neutralization tank. have to pay.

In another aspect of the embodiment of the present invention, a plurality of regulating tanks for storing waste water from the production facility, and according to input of production information including at least production items and production processes from the production facility, a measuring means capable of measuring the concentration of the wastewater, a control means for controlling the distribution of the wastewater to a plurality of adjustment tanks based on the concentration measurement value of the wastewater and a predetermined concentration standard value, and the wastewater stored in the adjustment tank and a feeding means for feeding the discharged wastewater to the wastewater treatment facility.

In one embodiment, the wastewater treatment apparatus according to the embodiment of the present invention is connected to a plurality of adjustment tanks and includes switching means for switching the supply of wastewater among the plurality of adjustment tanks, and the concentration measurement value is When the reference value is exceeded, the control means controls the switching means to distribute the wastewater to at least the first adjustment tank and the second adjustment tank, and the concentration of the wastewater in the second adjustment tank reaches the specified concentration. The transfer amount of waste water in the first adjustment tank to the second adjustment tank is controlled so as to be within the range, and when the measured value of the concentration of the waste water is less than the concentration reference value, the control means switches to the switching means. is controlled to distribute the wastewater to the second adjustment tank, and the supply amount of the wastewater flowing into the second adjustment tank is adjusted so that the concentration of the wastewater in the second adjustment tank is within the specified concentration range. Control.

According to the present invention, a wastewater treatment method and a wastewater treatment apparatus are provided that can equalize sudden changes in the properties of wastewater discharged from a production facility with a smaller and simpler facility and realize stable wastewater treatment at all times. can.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic showing an example of the waste water treatment apparatus which concerns on the 1st Embodiment of this invention. It is an example of the list|wrist showing the production information input into the control means of the waste water treatment apparatus which concerns on the 1st Embodiment of this invention. 4 is a graph showing an example of a BOD-TOC conversion formula showing an example of production information of the wastewater treatment apparatus according to the first embodiment; FIG. 4 is a flow diagram showing an example of switching control of inflow waste water to a plurality of adjustment tanks in the waste water treatment apparatus according to the first embodiment; It is a schematic diagram showing an example of a waste water treatment apparatus according to a second embodiment of the present invention. 7 is a graph showing an example of BOD meter indicated value-BOD (JIS-compliant) conversion formula showing an example of production information of the wastewater treatment apparatus according to the second embodiment. FIG. 10 is a flow diagram showing an example of switching control of inflow waste water to a plurality of adjustment tanks in the waste water treatment apparatus according to the second embodiment; It is a schematic diagram showing an example of a waste water treatment apparatus according to a third embodiment of the present invention. It is a schematic diagram showing an example of a waste water treatment apparatus according to a fourth embodiment of the present invention. 1 is a schematic diagram showing an example of a conventional treatment flow for waste water generated in a production plant; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are denoted by the same or similar reference numerals. It should be noted that the embodiments shown below are examples of apparatuses and methods for embodying the technical idea of the present invention. It does not specify anything.

(First embodiment)
The wastewater treatment apparatus according to the first embodiment of the present invention, as shown in FIG. measuring means 2, control means 3 for controlling the distribution of wastewater to a plurality of adjustment tanks 6 based on the concentration measurement value of the wastewater and a predetermined concentration reference value, and the wastewater stored in the adjustment tank 6 A feeding means 8 for feeding to the waste water treatment facility 7 is provided.

The number of adjustment tanks 6 is not particularly limited. In the example shown in FIG. 1, the adjustment tanks 6 include a first adjustment tank 6a, a second adjustment tank 6b, . . . The first adjustment tank 6a, the second adjustment tank 6b, . The first wastewater treatment facility 7a, the second wastewater treatment facility 7b, . . . are connected to the n-th wastewater treatment facility 7n. Treated water treated by the first waste water treatment equipment 7a, the second waste water treatment equipment 7b, .

Pipes for supplying wastewater generated in the production equipment 1 to each adjustment tank 6a, 6b, . 6a, 6b, . . . 6n, and switching means 5a, 5b, . It is

As the switching means 5a, 5b, . The switching means 5a, 5b, . . . 5n are electrically connected to the control means 3. The switching means 5a, 5b, . The valves provided in the switching means 5a, 5b, . . .

The first adjustment tank 6a, the second adjustment tank 6b, . . Water level information measured by the water level gauges 16a, 16b, . . . The control means 3, based on the water level information measured by the water level gauges 16a, 16b, . Judgment of acceptability of waste water and control of supply can be performed.

Although not shown, a water quality measuring meter is provided for measuring the water quality of the waste water flowing into the first adjusting tank 6a, the second adjusting tank 6b, . . . Based on the measurement result, it is possible to confirm whether the waste water in the first adjustment tank 6a, the second adjustment tank 6b, . . . may have been This makes it possible to more accurately control the inflow load amount of wastewater flowing into the first wastewater treatment facility 7a, the second wastewater treatment facility 7b, ..., the n-th wastewater treatment facility 7n. Wastewater treatment including biological treatment can be performed more stably in the equipment 7a, second wastewater treatment equipment 7b, . . . , n-th wastewater treatment equipment 7n. Furthermore, a flow meter may be provided to measure the flow rate of waste water flowing into the first adjustment tank 6a, the second adjustment tank 6b, . . . , the n-th adjustment tank 6n.

The production facility 1 is not limited as long as it generates waste water containing organic matter in the production of products. Specifically, various factories such as food processing factories, food manufacturing factories, beverage production factories, machine factories, automobile factories, etc., or various facilities such as shopping centers, restaurants, supermarkets, hotels, hospital kitchens, etc. included as 1.

The wastewater generated from the production equipment 1 is not particularly limited, and may be wastewater to which an inorganic coagulant, an organic coagulant, a pH adjuster (acid or alkali), or the like has been added in advance. Examples of organic substances in wastewater include carbohydrates, proteins, lipids, nucleic acids, vegetable oils, animal oils, mineral oils, alcohols, fatty acids, surfactants, and paints. Organic substances may be substances derived from animals or plants, chemically synthesized substances, substances produced from these substances, or decomposed substances.

The measuring means 2 includes a water quality measuring device capable of measuring the concentration of waste water. Specifically, various water quality measuring instruments such as a BOD meter, a TOC meter, a COD meter, a dissolved oxygen meter, and a sludge concentration meter can be used as the measurement means 2, for example. Among them, a BOD meter and a TOC meter can be preferably used for measuring the concentration of organic matter in waste water.

The measuring means 2 measures the concentration of wastewater from the production facility 1 in accordance with the input of production information including at least production items and production processes from the production facility 1 to the control means 3 . For example, the information on the production items input to the control means 3 may include the type of production item, the number of production items, the product name, and the like. For example, if the production facility 1 is a drinking water factory, products such as types of drinking water (tea drinks, carbonated drinks, coffee drinks, fruit drinks, dairy drinks, sports drinks, mineral water, other soft drinks) The type of product, its production quantity, product name, etc. are included as production item information.

As information on the production process, the specific production process flow for producing each production process, the operating status of each production process flow, and the appropriate interval between one production process flow and the next production process flow. including information on cleaning processes performed, maintenance and outages due to factory shutdowns, etc. The cleaning process includes information on initial rinsing, chemical recovery, chemical discharge, intermediate rinsing, final rinsing, alkali circulation, acid circulation, hot water supply, chlorine supply, etc. For each process, the cleaning time for each product item is specified. The length, frequency, and presence/absence of cleaning processes are determined.

As other production information, it is possible to include organic substance concentration information in waste water for each production item generated by production. For example, the production information can include information on the correlation between the BOD and TOC of a certain production item, information on conversion from the BOD indication value to the BOD concentration conforming to the JIS method, and the like. For example, when the inflow load of wastewater in biological treatment in the wastewater treatment facility 7 is controlled by BOD, a BOD meter may be used as the measuring means 2 to directly measure the BOD in the wastewater in real time. However, the measurement method using the BOD meter is not a method according to the JIS method (JIS K0102), but rather an estimated value using, for example, absorbance. . Further, for example, when a TOC meter is used as the measuring means 2, it is necessary to estimate the BOD concentration from the TOC concentration measurement value. required in advance. The organic substance concentration information in the wastewater for each production item is input to the control means 3 .

In response to the input of the production information, that is, every time the production information is changed, the changed production information is input to the control means 3, so that the control means 3 can control the production according to the production status of the production equipment 1. Since the increase/decrease in the amount of water and the concentration level of the wastewater generated from the equipment 1 can be estimated with higher accuracy, the wastewater can be dispensed and treated with higher efficiency. Further, by inputting information on the production process to the control means 3 at any time, it becomes possible for the control means 3 to use it as a trigger for starting switching control to the plurality of adjustment tanks 6 .

An example of production information is shown in FIG. The example of FIG. 2 shows an example of a production processing flow when manufacturing a product name "AA" as a production item. In the example of FIG. 2, for the product name "AA", at least seven production process flows for controlling the production facilities provided in the production facility 1 are provided, and information on each production process flow is sent to the control means 3. can be entered. The list in FIG. 2 can also include the operating status of each production processing flow.

For example, the operating state of the treated water from the extractor system is the operating status of the "treated water_extracting device system" for outputting the control signal. can be input to the control means 3 according to the operating status It's like

For example, when information that the product name "AA" is manufactured as the production item and that "(6) product_CIP system" is "in operation" as the production process information is input to the control means 3, the control means 3 can perform operation control on the production equipment 1 such as "for XX seconds, the valve into which the waste water with the higher concentration enters is closed". The production information can be customized accordingly by analyzing and modifying the production information list for each production item information respectively. The list of production information is optimized when manufacturing new production items.

The control means 3 receives the input of the production information, compares the concentration measurement value of the waste water measured by the measurement means 2 with a predetermined concentration reference value, and determines whether the concentration measurement value is equal to or higher than the concentration reference value or the reference value. The distribution of waste water to a plurality of adjustment tanks 6 is controlled based on whether the value is less than the value. The concentration reference value can be appropriately set according to, for example, the sludge load amount of wastewater treatment provided in the wastewater treatment facility 7 and the capacity of each adjustment tank 6 .

FIG. 3 shows an example of conversion formula information indicating the correlation between TOC and BOD in wastewater generated by production of certain production items (products 1 and 2) in the production facility 1. As shown in FIG. When a TOC meter is used as the measurement means 2, the control means 3 can convert the TOC concentration in the wastewater measured by the measurement means 2 using the conversion formula of FIG. 3 into the BOD concentration. In the control means 3, as a program for determining the concentration standard value, for example, the concentration standard value is determined from the inflow BOD amount (kg-BOD/day) and the wastewater discharge amount (m ³ /day) from the design calculation sheet and actual values. A program for calculating is preferably provided in advance, and the concentration reference value is determined according to the program. The density reference value may be preset by the operator.

For example, the control means 3 compares the BOD concentration measurement value converted from the TOC with a predetermined concentration reference value, and based on the relationship between the BOD concentration measurement value and the concentration reference value, the switching means 5a, 5b, . . 5n valves are controlled to open and close, and waste water is supplied to the first adjustment tank 6a, the second adjustment tank 6b, . . .

Specifically, when the concentration measurement value is equal to or higher than the concentration reference value, the control means 3 opens the valve provided in the switching means 5 capable of accepting high-concentration wastewater, and the switching means 5 capable of accepting low-concentration wastewater is opened. outputs a control signal to close the valve provided in the As a result, the switching means 5 is controlled to open and close, and the waste water flows into an arbitrary adjusting tank 6 .

When the concentration measurement value is less than the concentration reference value, the control means 3 closes the valve provided in the switching means 5 capable of accepting high-concentration wastewater and opens the valve provided in the switching means 5 capable of accepting low-concentration wastewater. Outputs a control signal to Then, the switching means 5 is controlled to open and close, and the waste water flows into an arbitrary adjustment tank 6 .

FIG. 4 is a flowchart showing an example of switching control of inflowing wastewater to a plurality of adjustment tanks in the wastewater treatment apparatus according to the first embodiment. Wastewater from the production facility 1 is supplied to the first adjustment tank 6a, the second adjustment tank 6b, . . . Then, the first wastewater treatment equipment 7a, the second wastewater treatment equipment 7b, . .. The quality and quantity of the waste water supplied to the n-th waste water treatment facility 7n can be made uniform.

As described above, according to the wastewater treatment apparatus and the wastewater treatment method according to the first embodiment of the present invention, even when the quality and quantity of wastewater from the production facility 1 suddenly fluctuates, the production information can be input. , the amount and quality of the wastewater supplied to the first wastewater treatment equipment 7a, second wastewater treatment equipment 7b, . . . n-th wastewater treatment equipment 7n can be made uniform. As a result, stable treatment can be performed in the first wastewater treatment equipment 7a, the second wastewater treatment equipment 7b, .

Furthermore, according to the concentration of the waste water, the waste water is distributed and stored in the first adjustment tank 6a, the second adjustment tank 6b, ... the n-th adjustment tank 6n, so that fluctuations in the amount of water can be assumed. Compared to the case where a relatively large-scale storage tank is provided alone, the volume of the biological treatment tank required as a whole can also be reduced.

(Second embodiment)
In the wastewater treatment apparatus according to the second embodiment of the present invention, as shown in FIG. 5, a first wastewater treatment facility 7a connected to a first adjustment tank 6a performs at least aeration treatment and biological treatment. It differs from the wastewater treatment apparatus shown in FIG. 1 in that the second wastewater treatment facility 7b, which is provided with treatment facilities and connected to the second adjustment tank 6b, is provided with wastewater treatment facilities for at least biological treatment. In the example of FIG. 5, the adjustment tank 6 is composed of two tanks, a first adjustment tank 6a and a second adjustment tank 6b. However, even in the example of FIG. 5, the number of adjustment tanks 6 may of course be two or more.

In the waste water treatment apparatus of FIG. 5, an example using a generally available BOD meter as the measuring means 2 will be described. FIG. 6 is information of a conversion formula showing the correlation between the BOD value in accordance with the JIS method in the wastewater generated by the production of a certain production item and the indicated value of the BOD meter as the concentration measurement value by actual measurement of the measurement means 2. For example. Based on the correlation shown in FIG. 6, the control means 3 estimates the BOD value based on the JIS method from the concentration measurement value measured by the measurement means 2. FIG.

When the estimated concentration measurement value is equal to or higher than the concentration reference value, the control means 3 distributes the waste water to the first adjustment tank 6a of FIG. Then, the waste water stored in the first adjustment tank 6a is fed through the feeding means 8a to the first waste water treatment facility 7a for at least aeration treatment and biological treatment. On the other hand, when the estimated concentration measurement value is less than the concentration reference value, the switching means 5a is closed and the switching means 5b is opened to distribute and store the waste water to the second adjustment tank 6b, and the second adjustment tank The waste water stored in 6b is fed through the feeding means 8b to the second waste water treatment facility 7b for at least biological treatment.

As shown in FIG. 7, for example, when the BOD concentration standard value is 1000 mg/L, when the BOD measurement value in the waste water is 1000 mg/L or more, the waste water is supplied to the first adjustment tank 6a, and the BOD measurement is performed. If the value is less than 1000 mg/L, the waste water is supplied to the second adjustment tank 6b and stored for a certain period of time.

According to the wastewater treatment apparatus and the wastewater treatment method according to the second embodiment, suitable biological treatment can be performed in each wastewater treatment facility 7 according to the concentration of the wastewater. As a result, regardless of rapid fluctuations in water quality and water volume, it is possible to always discharge treated water of stable quality to the outside.

(Third Embodiment)
In the waste water treatment apparatus according to the third embodiment of the present invention, as shown in FIG. It differs from the waste water treatment apparatus according to the first and second embodiments in that the Further, the second adjustment tank 6b is provided with measuring means 11 for measuring the concentration of the waste water in the second adjustment tank 6b. In the example of FIG. 8, a TOC meter for measuring the TOC of waste water is arranged as the measuring means 11, but any concentration measuring device can be used. A measurement result of the measuring means 11 is input to the control means 3 .

The control means 3 receives an input of production information from the production facility 1, compares the concentration measurement value of the waste water measured by the measurement means 2 with a predetermined concentration reference value, and determines that the concentration measurement value is equal to or higher than the concentration reference value. In this case, for example, the wastewater from the production facility 1 is distributed to the first adjustment tank 6a and the second adjustment tank 6b according to the volumes of the first adjustment tank 6a and the second adjustment tank 6b. After that, the control means 3 receives the input of the measurement result of the concentration of the waste water in the second adjustment tank 6b from the measurement means 11, and the concentration of the waste water in the second adjustment tank 6b becomes within the specified concentration range. , the waste water in the first adjustment tank 6a is transferred to the second adjustment tank. The transfer amount adjusts the opening and closing of the valve via the switching means 10 . The wastewater in the second adjustment tank 6b that has been adjusted within the specified concentration range is fed to the wastewater treatment facility 7 via the feeding means 8. As shown in FIG.

The high-concentration wastewater whose concentration measured value is equal to or higher than the concentration standard value can be quantitatively transferred from the first adjustment tank 6a to the second adjustment tank 6b. The transfer amount is adjusted so that the TOC concentration of the waste water in the second adjustment tank 6b is constant. Since the waste water is homogenized in the second adjustment tank 6b, the amount of organic matter flowing into the subsequent waste water treatment facility 7 can be made constant. When the concentration measurement value is less than the concentration reference value, the wastewater from the production facility 1 is distributed to the second adjustment tank 6b and stored therein.

According to the wastewater treatment apparatus and the wastewater treatment method according to the third embodiment, even when a rapid increase in the amount and concentration of wastewater occurs, the first adjustment tank 6a receives wastewater with large property fluctuations. Since the quality and quantity of water can be uniformized in the second adjustment tank 6b, the quality and quantity of the wastewater to be supplied to the wastewater treatment facility 7 in the subsequent stage can be efficiently uniformized. As a result, sudden fluctuations in the properties of waste water discharged from production equipment can be made uniform with smaller and simpler equipment, and stable waste water treatment can be realized at all times.

(Fourth embodiment)
The wastewater treatment apparatus according to the fourth embodiment of the present invention, as shown in FIG. When the concentration becomes equal to or higher than the predetermined concentration reference value, the switching means 5b is closed, the switching means 5a is opened, and the waste water is stored in the first adjustment tank 6a. When the concentration measurement value of the wastewater is less than the predetermined concentration standard value, the switching means 5a is closed, the switching means 5b is opened, the wastewater is fed to the neutralization tank provided in the first wastewater treatment facility 7a, and the second Used as a regulating tank.

In addition, in the example of FIG. 9, for the sake of explanation, an example in which one each of the first adjustment tank 6a, the first wastewater treatment facility 7a and the feeding means 8a is provided is described, but two or more of each are arranged. Of course, it is also good.

Depending on the product manufactured by the production facility 1, the concentration of organic substances in the waste water may be so low that biological treatment is not required. According to the wastewater treatment apparatus according to the fourth embodiment, wastewater that does not require biological treatment is directly supplied to the neutralization tank provided in the first wastewater treatment facility 7a via the switching means 5b, and By discharging wastewater as it is after summation treatment, the amount of wastewater flowing into the biological treatment can be reduced, and the treatment burden of the biological treatment can be reduced, so that more efficient wastewater treatment can be performed.

Although the present invention has been described by the above embodiments, the statements and drawings forming part of this disclosure should not be understood to limit the present invention. That is, the present disclosure is not limited to the above-described embodiments, and it goes without saying that the constituent elements can be combined with each other, modified, and embodied without departing from the scope of the present disclosure.

Examples of the present invention are presented below along with comparative examples, which are provided for a better understanding of the invention and its advantages and are not intended to be limiting of the invention.

(Example 1)
In the beverage production factory, the amount of organic matter increased as the number of production items increased, so we optimized the processing equipment. In the first embodiment, the production item information from the beverage production factory includes production item "AA" as shown in FIG. , and information on the production process is input to the control means each time the production process flow and operating status change. The control means presets a concentration standard value in each production process based on the input of production information, and determines high-concentration BOD wastewater based on the set concentration standard value and the concentration measurement result of the wastewater measured by the measuring means. and low-concentration BOD wastewater, and were separately flowed into two adjustment tanks having capacities shown in Table 1.

After that, the wastewater is stored in each adjustment tank while being aerated as necessary, and after equalizing the concentration of organic matter, it is flowed with microorganisms in each of the high-concentration biological treatment tank and the low-concentration biological treatment tank. After biological treatment using a carrier, it was discharged into the sewage system. For comparison, the same biological treatment as in Example 1 was performed using a conventional single regulating tank for storage. Table 1 shows an example of the adjustment method according to the prior art and the specifications and water quality of the adjustment method according to Example 1.

According to Example 1, it can be seen that the volume of the adjustment tank and the volume of the biological treatment tank can be reduced, and the BOD concentration of the treated water can be reduced, with the quality of the treated water being almost the same as that of the conventional technology.

In this way, according to the present disclosure, a wastewater treatment method and wastewater that can equalize sudden changes in the properties of wastewater from production equipment with a smaller and simpler equipment and realize stable wastewater treatment at all times. Processing equipment can be provided.

Reference Signs List 1 production equipment 2 measuring means 3 control means 4 flow meters 5, 5a, 5b, 5n switching means 6 adjusting tank 6a first adjusting tank 6b second adjusting tank 6n nth adjustment Tank 7 Wastewater treatment equipment 7a First wastewater treatment equipment 7b Second wastewater treatment equipment 7n n-th wastewater treatment equipment 8, 8a, 8b, 8n Feeding means 10 Switching means 11 Measuring means 16a, 16b, 16n... Water level gauge

Claims (5)

measuring the concentration of wastewater from the production facility according to the input of production information including at least the production item and the production process from the production facility;
Distributing the wastewater to a plurality of adjustment tanks based on the concentration measurement value of the wastewater and a predetermined concentration reference value,
Storing the wastewater in the adjustment tank to equalize the water quality and concentration of the wastewater;
A wastewater treatment method, characterized in that the wastewater stored in the adjustment tank is fed to a wastewater treatment facility capable of biological treatment. When the concentration measured value is equal to or higher than the concentration reference value, after the wastewater is distributed to at least the first adjustment tank and the second adjustment tank, the second storing the wastewater so that the concentration of the wastewater in the second adjustment tank is within a specified concentration range while adjusting the amount transferred to the adjustment tank;
When the concentration measurement value of the wastewater is less than the concentration standard value, the wastewater is distributed to the second adjustment tank, and the concentration of the wastewater in the second adjustment tank is within the specified concentration range. and storing the waste water as
2. The wastewater treatment method according to claim 1, wherein the wastewater in the second adjustment tank adjusted within the specified concentration range is fed to the wastewater treatment facility. When the measured concentration value is equal to or higher than the concentration reference value, the wastewater is distributed to and stored in the first adjustment tank, and then the wastewater stored in the first adjustment tank is at least aerated. And feeding to the wastewater treatment facility for biological treatment,
When the concentration measured value is less than the concentration standard value, the wastewater is distributed to and stored in a second adjustment tank, and the wastewater stored in the second adjustment tank is subjected to at least biological treatment. 2. The waste water treatment method according to claim 1, wherein the waste water is supplied to said waste water treatment facility. a plurality of regulating tanks for storing wastewater from production equipment;
measuring means capable of measuring the concentration of the wastewater from the production facility in response to input of production information including at least the production item and the production process from the production facility;
control means for controlling distribution of the waste water to the plurality of adjustment tanks based on the concentration measurement value of the waste water and a predetermined concentration reference value;
A waste water treatment apparatus comprising: a feeding means for feeding the waste water stored in the adjustment tank to a waste water treatment facility. Switching means connected to the plurality of adjustment tanks for switching supply of the waste water among the plurality of adjustment tanks,
When the concentration measured value is equal to or higher than the concentration reference value, the control means controls the switching means to distribute the waste water to at least the first adjustment tank and the second adjustment tank, and the second controlling the transfer amount of the waste water in the first adjustment tank to the second adjustment tank so that the concentration of the waste water in the adjustment tank is within the specified concentration range;
When the concentration measurement value of the wastewater is less than the concentration standard value, the control means controls the switching means to distribute the wastewater to the second adjustment tank, 5. A waste water treatment apparatus according to claim 4 , wherein the amount of waste water supplied to said second adjustment tank is controlled so that the concentration of said waste water in said waste water is within said specified concentration range.

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