JP3343611B2 - Wastewater treatment equipment for food processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject apparatus extremely reduced in equipment cost by effectively putting the amorphous broken small pieces of a PET bottle becoming industrial waste to practical use as a filter medium. SOLUTION: Microorganism culturing filter parts 1 housing broken small pieces 1' of a PET bottle are formed in a necessary number of small-sized aeration tanks a1 storing sewage (water to be treated) treated per a day in a food processing factory and the sewage (water to be treated) passed through each microorganism culturing filter part 1 is sent to the adjacent small-sized aeration tank a1 from the bottom of each tank al and, after the operation in the food processing factory is completed, the sewage (water to be treated) of the group of the small-sized aeration tanks a1 is forcibly circulated for a predetermined time by a circulating means 3 and a sensor means 4 of sewage (water to be treated) is provided to the desired small-sized aeration tank a1 and drain means 5 of sewage (water to be treated) are provided at a position higher than the height levels of the microorganism culturing filter parts 1 of the small-sized aeration tanks a1. The drain means 5 automatically drain cleaned water above the microorganism culturing filter parts 1 when the sensor means 4 detects that sewage is cleaned up to predetermined water quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for treating wastewater for food processing.

[0002]

[Technical background and its problems] If a wastewater (treated water) discharged from a single food processing plant such as a fishery processing plant is more than 50 tons per day, it is legally regulated to treat and discharge wastewater. There is, but less than 50 tons of sewage (treated water)
There is no legal regulation for wastewater treatment. by the way,
Small and medium-sized food processors that produce less than 50 tons of sewage (processed water) are far more numerous than large-scale food processors, and wastewater is discharged without sewage treatment without legal restrictions. If it continues, it will lead to marine pollution as well as rivers and lakes, which is not desirable from an ecological point of view.

However, a large-scale and large-scale sewage treatment facility on the premise of 50 tons or more cannot be reached by small and medium-sized food processors. Coveted.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to make effective use of irregularly crushed small pieces of plastic bottles, which are industrial waste, as a filter medium. Another object of the present invention is to provide a wastewater treatment apparatus for food processing, which has a very low facility cost.

[0005]

The technical measures taken to solve the above-mentioned object are as follows: each of a required number of small aeration tanks capable of sharing and storing treated water discharged in one day in a food processing plant; A microbial culture filter unit containing crushed small pieces of PET bottles is provided, and treated water is passed from the small aeration tank on the upstream side to the small aeration tank on the downstream side through the microbial culture filter unit and communicated so that water can be sent from the bottom of the tank, The processing water in the small aeration tank group is forcibly circulated by the circulation means for a predetermined time after the operation of the food processing plant, and a sensor means for detecting the quality of the processing water in the desired small aeration tank is provided. The gist is that a drainage means for treated water is provided at a position higher than the culture filter section height level. Here the small aeration tank is
It is preferable to use a 1-ton tank of FRP because it is mass-produced and inexpensive. The predetermined working time of the circulating means is a time required for purifying the water to at least a level that can be used as intermediate water such as flush water for toilets, and the minimum time depends on the degree of contamination of the sewage (treated water). It is set for 14 hours and 16 hours when the dirt is severe. Further, an example of the sensor means is an infrared sensor that detects the degree of water pollution.

[0006] The number of the small aeration tanks is used in such a manner as to share and store the total amount of wastewater (treated water) generated during the operation of the food processing plant. For example, when 5 tons of wastewater (processed water) is generated in one day's operation, the amount of stock for constantly immersing the microbial culture filter unit is added, and in the case of a 1 ton tank, about 8 pieces are used. Wastewater generated during operation (treated water)
The water is collected in the water collecting tank and started to be discharged into the most upstream small aeration tank. At the end of the operation, the water is shared and stored in all the small aeration tanks. Then, after the operation is completed, the circulating means is operated for 14 hours by using the night before the operation of the food processing plant, and the stagnant sewage (processed water) is forcibly circulated in each small aeration tank at a very low speed, and the PET bottle is discharged. It passes between irregularly broken crushed pieces and decomposes dissolved organic matter contained in sewage (treated water) with aerobic microorganisms attached and propagated there. The sensor means periodically detects water quality, outputs an output signal to the control unit, and the control unit compares the output signal with a stored value based on the output signal, and performs an arithmetic processing to determine that the water has been purified to the stored value or more. In such a case, a distress display is displayed so that the attending manager is made aware of this, and the opening of the drainage means is urged. This drainage means is linked with the sensor means and the control unit, and controls to automatically open when the sensor means performs arithmetic processing that the sensor means has been purified from a predetermined stored value, considering workability. It is suitable.

[0007] Further, the time-up time of the timer means interlocked with the circulation means which operates after the operation of the food processing plant is completed, and the delay time (for example, about 10 minutes) after the operation time of the circulation means (for example, 14 hours) is added. Even if the sensor means exceeds the operating time of the circulating means, the drain means is automatically opened when the timer means times out because the wastewater (processed water) cannot be purified to the stored value or more even if the sensor means exceeds the operating time of the circulating means. It is preferable that a warning is given by a warning means together with the drainage of the intermediate treatment wastewater. The warning may be a buzzer or lighting of an identification light.

In this way, it is possible to urge the administrator to perform maintenance and inspection of the cleaning failure. The drained wastewater (processed water) in the intermediate treatment stage is stored in a temporary storage tank,
Pump up the water collection tank again and discharge it to the small upstream aeration tank.

[0009] The microbial culture filter section is composed of several water-permeable cases for accommodating crushed small pieces of PET bottles, each case being supported detachably with respect to the tank, and the bottom of a small aeration tank. In addition, it is preferable that an outlet of a natural water supply pipe for supplying water to the adjacent downstream tank is opened.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show an embodiment of a sewage treatment apparatus for marine products as an apparatus for treating sewage for food processing of the present invention, and reference numeral A denotes the sewage treatment apparatus for marine products.

The sewage treatment apparatus A for marine processing comprises a required number of small aeration tanks a1, a microbial culture filtration unit 1 provided in each small aeration tank a1, and a small aeration tank a1.
Natural water pipe 2, small aeration tank a
It comprises a circulating means 3 for forcibly circulating one group, a sensor means 4, a draining means 5, and the like.

As the small aeration tank a1 described above, a mass-produced and inexpensive 1-ton FRP tank is used as described above. The small number of aeration tanks a1... Are installed in a small number of aeration tanks a1.
Are provided, and each of the upper opening portions is openably and closably covered so as to prevent emission of odor to the outside. The small aeration tank a1 has a raised bottom shape, and the lower space 100 is provided with a piping space of the natural water supply pipe 2 or a diffuser pipe (or diffuser plate) 6 for supplying water to the tank a1 downstream.
The nozzle 16 of the diffuser pipe 6 (or diffuser plate) faces the inside from the bottom of each tank a1 and is constantly aerated.

As shown in FIG. 2, the microbial culture filter unit 1 includes a plurality of rectangular parallelepiped cases (hereinafter, referred to as first cases) 11 made of synthetic resin or metal meshes. Each of the box-shaped cases (hereinafter, referred to as a second case) 21 made of a metal net is configured to house the crushed small pieces 1 ′ of the PET bottle, and the first case 1
Reference numeral 1 denotes a rectangular frame in a plan view so as to surround a central portion of each small aeration tank a1 so as to be detachable, and the second case 21 has a space in the center with an upper part closed as shown in FIG. The first case 11 is loosely fitted to the inside of the first case 11 so that it can be inserted and removed. The second case 21 may be divided into a plurality of parts in the vertical direction, and may be constituted by the divided bodies.

The first case 11 and the second case 21
In both cases, the height is about 1/3 of the small aeration tank a1 (30
cm to 40 cm), a lifting means 7 such as a handle is attached to the top surface, and the top surfaces 11a and 21a are pivotally supported to be openable and closable when necessary.

The support means 200 of the first case 11 includes:
A U-shaped guide rail (described below with reference numeral 200) is required to stand upright with the lower end fixed to the bottom of each tank a1. Both ends can be inserted into and removed from the guide rail 200, As shown in the figure, it is framed in a rectangular frame shape in plan view.

The crushed small pieces 1 ′ of the plastic bottle in the first case 11 accommodate coarser pieces than the crushed small pieces 1 ′ accommodated in the second case 21. The crushed small piece 1 ′ of the PET bottle is an irregular shape having a shape of about 10 mm even for coarse grain and about 5 to 6 mm for fine grain, and is suitable as a home for aerobic microorganisms with an irregular shape. Can create an environment.

Each natural water pipe 2 has a small aeration tank a1.
The outlet at one end is connected to the bottom of the tank, and the inlet at the other end is connected to the upper wall of the adjacent downstream tank a1.

The circulating means 3 is provided in the forced circulation pipe 13 for communicating the most upstream small aeration tank a1 from which the wastewater (treated water) is discharged and the most downstream small aeration tank a1, and the forced circulation pipe 13 is provided. And the circulation pump 23 is driven for a predetermined time in conjunction with the end of the operation of the fishery processing plant to drive each of the small aeration tanks a1.
Is controlled so as to forcibly circulate the sewage (treated water) stored at a low speed.

The sensor means 4 uses an infrared sensor or the like for detecting the degree of water pollution, and is attached to a tank wall portion above the microorganism culture filter section 1 in a desired small aeration tank a1. In the present embodiment, it is attached to the most downstream small aeration tank a1, detects the degree of water pollution periodically, such as every one hour, and compares the predetermined storage value stored in the controller C with the predetermined storage value. The control is performed so that the drain means 5 is automatically opened when the predetermined stored value is cleared.

The drainage means 5 is an electromagnetic switching valve in the present embodiment, and is provided at a position slightly higher than the height level of the microorganism culturing filter 1 at each natural water discharge pipe 2 and the starting pipe section 13a of the forced circulation pipe 13. Have been.

The control section C has a built-in timer means (not shown) which starts together with the circulation means 3 after the operation at the fishery processing plant is completed. This timer means, for example, 1
The time is up when 0 minutes have passed, and the means 8 for forcibly opening the drainage means 5 and issuing a warning, for example, a buzzer and an identification lamp, are linked via the control unit C by the time-up signal.

The electromagnetic switching valve 5 includes a water storage tank 300.
Alternatively, the other end of the drain pipe 9 connected to the temporary storage tank 400 is connected, and an electromagnetic switching valve 19 for switching the flow path to the water storage tank 300 or the temporary storage tank 400 is provided in the middle of the drain pipe 9. I have.

A vent pipe a2 is connected to each of the small aeration tanks a1, and the vent pipes a2 are assembled into a blower a3 via a deodorizing device a4 provided in the blower a3 or on the upstream side thereof. Each small aeration tank a
It is configured to deodorize the odor filled in 1 and exhaust it to the outside. The vent pipe a2 is not connected at one end thereof to the lid so as to communicate with the inside, but is connected at the upper end of the wall of each small aeration tank a1 which does not come into contact with the treated sewage so as to communicate with the inside. Is of course also good.

In the sewage treatment apparatus for fishery processing configured as described above, the operation of the fishery processing plant is performed from the uppermost stream of the small aeration tank a1 constantly aerated from the air diffuser (or diffuser plate) 6. As a result, sewage (treated water) starts to be supplied (discharged) from the water collection tank 500, and at the end of operation, for example, at 5:00 in the evening, all the tanks a1 are filled with sewage (treated water) to the same height level. The circulating means 3 continues to be driven for a predetermined set time (14 hours) in conjunction with the main switch for terminating the operation of fishery processing, and circulates wastewater (treated water) stored in all the tanks a1 at a low speed. The sewage (processed water) at the time of circulation passes through the coarse crushed pieces (crushed pieces of PET bottles) 1 ′ contained in the first case 11 group framed in a rectangular shape in a plan view as described above, Subsequently, the crushed small pieces (crushed small pieces of PET bottles) 1 ′ contained in the second case 21 are in contact with and pass through the same, and finally the natural water pipe 2 connected to the bottom of the central space of the tank 1 is adjacent to the small crushed pieces 1 ′. Water is sent to the downstream small aeration tank a1 to be provided, and this circulation is repeated for each small aeration tank a1, and the operation is continued until the operation time of the circulation means 3 is up.
The dissolved organic matter contained in the sewage (treated water) is decomposed by aerobic microorganisms adhered and propagated at the time of passage between the crushed small pieces 1 ′ accommodated in the first case 11 group and the second case 21, and the sewage (treatment) Water).

The sewage (treated water) to be treated is 5 tons, and a 1 ton tank and 8 pieces are used based on the amount of stock water for preventing the aerobic microorganisms attached to the microorganism culture filter unit 1 from being killed. After the operation was completed, before the operation, the forced circulation time was designated as 14 hours by a changeover switch of an operation panel associated with the control unit C, and according to an experiment in which the forced circulation was performed, the sensor means 4 was controlled in 13 hours and 30 minutes. The electromagnetic switching valve 5 automatically opens the drain pipe 9 upon detecting that the water has been purified to the stored value or more in the part C, and drains purified water from the microorganism culture filter part 1. This purified water had, of course, both a biological oxygen demand (BOD) and a chemical oxygen demand (COD) of about usable middle water such as toilet flush water.
The purified water is once stored in the water storage tank 300.

If the case 11 or 21 constituting the microorganism culturing and filtering unit 1 is clogged and is not purified to a predetermined storage value or more within a predetermined forced circulation time, the control unit C similarly controls the electromagnetic switching valve. 5, the drainage pipe 9 is automatically opened, and the electromagnetic switching valve 19 of the drainage pipe 9 is also controlled to guide the sewage (treated water) in the intermediate treatment stage to the temporary storage tank 400. I have. The sewage (treated water) in the intermediate treatment stage of the temporary storage tank 400 is configured so that the sewage (treated water) is pumped up to the water collecting tank 500. Although the wastewater (treated water) in the water storage tank can be drained to sewage as it is, it is preferable to use it as washing water for factories and local toilets.

In addition to the forced circulation time of the circulation means 3, the time-up time of the timer means (not shown) is
The time can be adjusted by operating a time setting switch of an operation panel (not shown) linked to the control unit C.

The apparatus for treating wastewater for food processing of the present invention may be buried underground. Further, the present invention includes a configuration in which a microbial culture filter section containing crushed small pieces of a PET bottle is layered on the bottom of each small aeration tank, and the second case 21 shown in the above embodiment is covered from above. The case in which the coarse crushed small piece of the pet bolt is accommodated and the case in which the fine crushed small piece of the pet bolt is accommodated may be configured so that the case accommodating the coarse crushed small piece is positioned on the upper side. Things.

[0029]

As described above, the present invention focuses on the irregular shape of the crushed small pieces of plastic bottles, and uses it as an aerobic microorganism adhering matter to wastewater (treated water) from a food processing plant. Because it is designed to decompose dissolved organic matter, etc., contained wastewater for food processing, which contributes to prevention of environmental pollution in rivers, lakes, marshes, oceans, etc., effectively utilizes industrial waste (crushed small pieces of PET bottles). In addition, it can be provided at low cost, and can contribute to the preservation of the global environment from the viewpoint of the use of industrial waste, which is optimal for small and medium-sized food processors. In addition, mass-produced FR as a small aeration tank
By using a P1 ton tank, further inexpensiveness is achieved. In addition, when the drain means automatically opens when the sensor means detects that the water has been purified to a predetermined quality, the waste water (treated water) is drained without the need for a manager involved in food processing. It is very convenient because it can be used as toilet flush water. Furthermore, the microbial culture filter section is composed of several water-permeable cases for accommodating crushed small pieces of plastic bottles, and when each case is supported so as to be able to be inserted and removed from the tank, remove it when clogging. ,
Can be washed in water using the open space outside the tank.
Further, when the timer means set to the same time as or slightly longer than the operation time of the circulation means (for example, 14 hours), when the time is up, it is determined that the sewage could not be purified to a value equal to or more than the storage value of the control unit, so that it is interrupted. If the system is configured to drain sewage (processed water) at the treatment stage and warn with a warning means, it will prompt the administrator to check for purification failure, and make sure that each of the microorganism culture filters is close to the top. As the water level in the tank drops, it is easy to visually check which case of which tank is clogged, and maintenance and inspection can be performed more easily and reliably.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing an apparatus for treating wastewater for food processing.

FIG. 2 is an enlarged perspective view showing a microorganism culturing filter part, which is partially cut away.

[Explanation of symbols]

A: Wastewater treatment equipment for food processing a1: Small aeration tank 2: Natural water pipe 3: Circulation means 4: Sensor means 5: Drainage means (electromagnetic switching valve) 1: Microorganism culture filter layer 1 ': Crushed pieces 11: Storage Case (first case) 21: accommodation case (second case) 8: means for issuing an alarm 9: drain pipe 19: solenoid switching valve 300: water storage tank 400: temporary storage tank 500: water collection tank

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI C12N 1/00 C12N 1/00 S // (C12N 1/00 C12R 1:00 C12R 1:00)

Claims (4)

(57) [Claims] 1. A microbial culture filter unit accommodating crushed small pieces of a PET bottle is provided in each of a required number of small aeration tanks capable of sharing and storing treated water discharged in one day in a food processing plant,
The treated water passes from the small aeration tank on the upstream side to the small aeration tank on the downstream side and passes through the microbial culture filtration unit to be able to send water from the bottom of the tank, and after the operation of the food processing plant, the processing of the small aeration tank group for a predetermined time Water is forcibly circulated by the circulating means, a sensor means for detecting the quality of the treated water is provided in a desired small aeration tank, and the treated water is located at a position higher than the height of the microorganism culture filter of the small aeration tank. An apparatus for treating wastewater for food processing, comprising a drainage means. 2. The apparatus according to claim 1, wherein said drainage means automatically opens when the sensor means detects that the water has been purified to a predetermined quality. 3. The timer means is started up in conjunction with the operation of the circulating means. When the timer means does not detect that water has been purified to a predetermined quality by the elapse of the predetermined operation time of the circulating means. 3. The wastewater for food processing according to claim 1 or 2, wherein the drainage means is automatically opened when the time is up, and a means for issuing a warning when the drainage means is automatically opened is linked to the timer means. Processing equipment. 4. The microbial culture filter unit for accommodating the crushed small pieces of the PET bottle is composed of several water-permeable cases accommodating the crushed small pieces, and each case is supported so as to be able to be inserted into and removed from a tank. The wastewater for food processing according to any one of claims 1 to 3, wherein an outlet of a natural water pipe for supplying water to the adjacent downstream tank is opened at the bottom of the small aeration tank. apparatus.