JP2004358343A - Recycling water generation device, and recycling water generation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recycling water generation device and a recycling water generation method where, at the time when, by removing suspended solids in waste water used for food processing, the water is made reutilizable, the recycling water of high water quality can be generated with high efficiency while attaining the remarkable reduction of backwashing water. <P>SOLUTION: Used water which has been used for food processing is introduced into a drum filter 2, and crude garbage in the used water is removed by primary treatment with the drum filter 2. The used water freed from the crude garbage is introduced into a treatment tank 3, and impurities in the water are floated up to the water face together with bubbles by foam fractionation. Air is blown to the floated-up bubbles by a blower 7. Thus, the impurities in the treated water are forcedly exhausted to the outside of the treatment tank 3 together with the bubbles. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００６７】
この実験結果から明らかなように、本実施形態に係る海苔抄き水処理装置Ｃを使用して浄化処理を行った場合には、一般細菌や大腸菌を全く含まず、略無色透明で良好な水質の再生利用水が生成されていることが判る。
【００６８】
−その他の実施形態−
上述した実施形態では、乾燥海苔生産システムにおける海苔抄き水処理装置Ｃとして本発明を適用した場合について説明した。本発明はこれに限らず、その他の食品加工に使用された排水中の懸濁物質等を除去して再生利用水を生成する処理装置に適用することも可能である。
【００６９】
また、上述した実施形態では、処理水の殺菌・脱色のための手段として、「排水ピットＤの内部への酸化剤の添加」「処理タンク３の内部への酸化剤の添加」「処理タンク３内の水の電気分解」「気泡発生装置６によるオゾンの供給」を行うようにしていた。本発明は、これに限らず、これら手段のうちの何れか一つまたは複数を選択的に実施するようにしてもよい。
【００７０】
更に、上述した実施形態に係る海苔抄き水処理装置Ｃでは、架台１の上部にドラムフィルタ２を設置していた。本発明はこれに限らず、海苔抄き水処理装置Ｃの設置スペースとして高さに制約がある場合には、ドラムフィルタ２を架台１の横に設置するようにしてもよい。この場合、ドラムフィルタ２で濾過した排水を処理タンク３の内部へ搬送するためのポンプが必要になる。
【００７１】
加えて、一次処理において使用する濾過器としては、ドラムフィルタ２に限らず、傾斜板式スクリーン等の種々の濾過器が適用可能である。
【００７２】
【発明の効果】
以上のように、本発明では、食品の加工に使用された使用済み水を再利用可能とするための手段として泡沫分離を使用し、この泡沫分離によって水面に浮遊した気泡に対して送風を行い、これによって、処理水中の不純物を気泡と共に貯留槽の外部に向けて強制的に搬送するようにしている。このため、濾過による使用済み水の浄化を採用していないため逆流洗浄が不要になる。従来では、逆流洗浄に要する水量が多く必要になってしまい、水をリサイクルすることの本来の目的である「節水」を大きく阻害してしまっていたが、本発明によれば、貯留槽に貯留された使用済み水の殆どを再生利用水として生成することが可能となり、食品加工システム全体として大幅な節水を実現しながらも水質の良好な再生利用水を生成することが可能となる。
【００７３】
また、気泡供給手段によって使用済み水中に連続的に供給される気体としてオゾンを採用したり、貯留槽内に貯留されている使用済み水中や一次処理の前段階における使用済み水中に殺菌剤を添加したり、貯留槽内に貯留されている使用済み水を電気分解する電気分解手段が設けた場合には、処理水の殺菌・脱色を効果的に行うことができ、更に水質の良好な再生利用水を生成することが可能になる。
【００７４】
更に、一次処理を行う構成としてメッシュ式の濾過器を備えさせた場合において、このメッシュ式の濾過器を貯留槽の上方に設置し、このメッシュ式の濾過器において粗ゴミが除去された使用済み水を貯留槽内に落下供給するようにした場合には、濾過器から貯留槽内に使用済み水を搬送するための特別な搬送駆動源は必要なくなり、コストの低廉な再生利用水生成装置を実現することが可能となる。また、再生利用水生成装置の設置スペースの小型化を図ることも可能になる。
【図面の簡単な説明】
【図１】実施形態に係る乾燥海苔生産システムにおける濃度調整槽、海苔抄機、海苔抄き水処理装置の設置状態を示す模式図である。
【図２】海苔抄き水処理装置を示す図である。
【図３】処理タンクの外観を示す図であって、（ａ）は平面図、（ｂ）は正面図、（ｃ）は側面図である。
【図４】乾燥海苔生産システムの概略を説明するためのブロック図である。
【符号の説明】
Ｃ 海苔抄き水処理装置（再生利用水生成装置）
２ ドラムフィルタ（濾過器）
３ 処理タンク（貯留槽）
５ 逆洗浄用ポンプ
６ 気泡発生装置（気泡供給手段）
７ ブロア（送風手段）
８ 電気分解装置（電気分解手段）
９４ 逆流洗浄水配管[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides, for example, a recycled water generation apparatus applied to a case where laver paper used in a production process of dried laver is made reusable and the like, and a recycled water generation method performed by the apparatus. According to. In particular, the present invention relates to a measure for generating recycled water having good water quality with high efficiency.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a dry nori (plate nori) production plant requires 1-2 liters of water per sheet nori, and a plant producing 10,000 sheets of nori per hour takes one hour. 10-20m per ³ Need water. Therefore, when the factory is operated for 10 hours a day, the amount of water used per day is 100 to 200 m. ³ It will also extend to. Most of the used water amount is consumed as laver drawing water used when laminating paper leaf-like laver with a laver cage in a laver machine.
[0003]
In general, producers of plate laver are involved in everything from laver cultivation to plate laver processing, and there are concerns about water shortages in some areas. It is the current situation. In other words, the contaminants and the like contained in the laver paper used in the processing of the laver (used laver water) are removed and purified, and the water can be reused as laver water. I have.
[0004]
Hereinafter, a dried laver production system in the case of treating and recycling (reusing) waste water (used laver drawing water) containing pollutants and the like will be described with reference to the block diagram of FIG.
[0005]
As shown in FIG. 4, the dried laver production system mixes and stirs the harvested laver original algae and the seawater for washing in the agitation washing tank a, and cuts (minces) the laver original algae for washing. Thereafter, the shredded nori original algae is sent to a concentration adjusting tank b in which fresh water is stored, where the mixed water of the nori original algae and fresh water is adjusted to a predetermined concentration (appropriate concentration) suitable for papermaking. Adjusted. Then, the mixed water is sent to a laver paper making machine c, where paper-like laver is made by a laver cage.
[0006]
After the dried laver is dried by the dryer d, it is peeled off from the laver cage by the peeler e, sorted, baked laver processed (sterilized), and then shipped as a product.
[0007]
On the other hand, the wastewater (used laver-making water) discharged from the laver-making machine c is treated by the treatment device f so that it can be reused. The water treated and purified by the treatment device f is returned to the concentration adjusting tank b and reused as laver water. It should be noted that tap water is replenished to the concentration adjusting tank b in order to compensate for the shortage of laver drawing water.
[0008]
As the above-mentioned processing device f for purifying used laver drawing water, those disclosed in the following Patent Documents 1 and 2 are known. These patent documents disclose that by performing a two-stage filtration step, pollutants of the laver drawing water are removed, and the laver drawing water is purified and made reusable.
[0009]
Specifically, Patent Document 1 discloses a configuration in which the primary filter is a screen made of a wire mesh of 40 to 400 mesh, and the secondary filter is a sand filter. On the other hand, Patent Literature 2 discloses a configuration in which a primary-side filter is a punching metal tube and a secondary-side filter is a filter tube (unglazed, filter paper tube, activated carbon) having minute holes.
[0010]
[Patent Document 1]
JP 2002-282865 A
[Patent Document 2]
JP 2001-269141 A
[0011]
[Problems to be solved by the invention]
However, since the pollutants in the laver paper water are suspended substances (Suspended Solid: SS component) containing a large amount of organic substances such as laver leaf debris, laver granule protein, laver plastids, etc. In the disclosed technology, clogging of the filter medium frequently occurs.
[0012]
For this reason, when the filter medium is clogged, it is necessary to perform a backwashing treatment of the filter medium by a large-scale backwashing device. As a result, there has been a problem that the equipment cost is increased, and the production cost of laver is also increased due to complicated processes.
[0013]
In addition, since both the primary side filter and the secondary side filter require periodic backwashing, a large amount of water is required for the backwashing. This will greatly hinder a certain “water saving by recycling water”. In particular, in the secondary-side filter, clogging is likely to occur frequently due to the fine mesh for filtration, and the backwash water used in the secondary-side filter is “ It greatly hindered water saving.
[0014]
The above-mentioned problem occurs not only in the processing apparatus for laver-making water but also in various processing apparatuses that reuse the water by removing suspended substances and the like in wastewater used for food processing. ing.
[0015]
The present invention has been made in view of such a point, and an object of the present invention is to remove the suspended substances and the like in wastewater and make it possible to reuse the water. It is an object of the present invention to provide a recycled water generation device and a recycled water generation method capable of generating highly efficient recycled water with high efficiency while achieving a significant reduction.
[0016]
[Means for Solving the Problems]
-Summary of the invention-
In order to achieve the above object, the present invention uses foam separation as a means for making used water used for food processing reusable, and this foam separation removes air bubbles floating on the water surface. In this way, air is blown, thereby forcibly transporting impurities in the treated water together with bubbles to the outside of the storage tank.
[0017]
-Solution-
Specifically, it is assumed that a recycled water generating apparatus for processing used water used for food processing so that it can be reused. This reclaimed water generator is provided with a storage tank, a bubble supply unit, and a blowing unit. The storage tank stores the used water from which coarse dust has been removed by the primary treatment. The bubble supply unit continuously supplies gas into the used water stored in the storage tank in the form of bubbles. The air blowing means performs air blowing for transporting the air bubbles floating on the surface of the used water along with the gas supply from the air bubble supply means to the outside of the storage tank on the water surface. Thereby, the impurities in the used water are discharged to the outside of the storage tank together with the bubbles, and the treated water remaining in the storage tank can be taken out as recycled water.
[0018]
According to this specific matter, firstly, the used water (used seaweed making water) used for processing of food (for example, production of dried seaweed) is temporarily stored in a storage tank after coarse dust is removed by the primary treatment. Will be stored. In this storage tank, gas is continuously supplied in the form of bubbles by the bubble supply means. Thereby, impurities in the used water are taken into the bubbles and float on the surface of the used water. Then, air blowing from the air blowing means is performed on the air bubbles floating on the surface of the used water, and the air bubbles taking in the impurities are conveyed on the water surface toward the outside of the storage tank, For example, it is discharged from the outlet of the storage tank. In this way, the impurities in the used water are continuously discharged from the storage tank. Therefore, the treated water remaining in the storage tank becomes purified water containing almost no impurities, and is taken out from the storage tank as water (seaweed water) that can be reused for processing food.
[0019]
Through the above operation, the used water is purified and the recycled water is generated. That is, in the operation of generating the recycled water in the present solution means, the backwashing is unnecessary because purification of the used water by filtration is not adopted. In the past, a large amount of water was required for backwashing, which greatly hindered the "water saving" that is the original purpose of water recycling. Most of the stored used water can be generated as recycled water, and significant water saving can be realized in the food processing system as a whole.
[0020]
Specifically, as a configuration for performing the primary treatment, coarse dust in used water is removed by a mesh-type filter. According to this, only minute impurities flow into the storage tank together with the used water, and the impurities can be easily taken in by the bubbles and floated on the water surface, and the recycled water can be used. Purification efficiency can be improved. In addition, by using a filter only for the primary treatment with a relatively coarse mesh, the frequency of the backwashing operation for this filter can be reduced, and the amount of backwash water used can be reduced. Significant water saving can be realized for the whole system.
[0021]
In this case, there is provided a backwashing water takeout means for taking out a part of the treatment water from the storage tank and making it usable as backwashing water for backwashing the mesh type filter. According to this, a special tank for storing the backwash water is not required, and the configuration of the recycled water generation device can be simplified and downsized.
[0022]
Specifically, air or ozone is employed as the gas continuously supplied to the used water by the bubble supply means. In particular, when ozone is employed, it becomes possible to sterilize and decolorize the treated water using the ozone. That is, the ozone can have both a function as a source of bubbles and a function for sterilizing and decolorizing the treated water.
[0023]
Further, the following are listed as configurations for sterilizing and decolorizing treated water. In other words, a configuration in which a disinfectant is added to the used water stored in the storage tank, a configuration in which an electrolysis means for electrolyzing the used water stored in the storage tank is provided, and in a stage prior to the primary treatment, In this configuration, a bactericide is added to used water. According to these specific items, sterilization and decolorization of the treated water can be effectively performed, and it is possible to generate recycled water having good water quality.
[0024]
When a mesh-type filter is provided as a configuration for performing the primary treatment, the mesh-type filter is installed above the storage tank, and the used filter from which coarse dust is removed in the mesh-type filter. The water is dropped and supplied into the storage tank. According to this, a special transport drive source for transporting the used water from the filter into the storage tank is not required, and a low-cost reclaimed water generation device can be realized.
[0025]
The recycling water generation method implemented in any one of the above-described solving means in the recycling water generation device is also included in the technical idea of the present invention. In other words, the used water from which coarse dust has been removed by the primary treatment is stored in a storage tank, gas is continuously supplied to the used water in the form of bubbles, and the surface of the used water is supplied along with the gas supply. Air is blown to convey air bubbles floating on the surface of the water toward the outside of the storage tank, thereby discharging impurities in the used water to the outside of the storage tank together with the air bubbles, and processing remaining in the storage tank. This is a method for producing recycled water in which water is taken out as recycled water. According to this method, the same operation and effect as those of the above-described solving means can be obtained.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a case will be described in which the present invention is applied as a laver drawing water treatment device (recycled water generation device) in a dried laver production system. The overall configuration and production process of this dried laver production system are substantially the same as those described with reference to FIG. 4 above, and thus description thereof will be omitted. Only the configuration up to the processing device and the processing operation will be described.
[0027]
FIG. 1 is a schematic diagram illustrating a state in which a concentration adjusting tank A, a laver sheeting machine B, and a laver sheeting water treatment apparatus C are installed in the dried laver production system according to this embodiment. FIG. 2 is a view showing the laver-making water treatment apparatus C (the gantry 1 of the laver-making water treatment apparatus C is indicated by a virtual line).
[0028]
Fresh water is stored in the concentration adjusting tank A, and the nori original algae shredded in a stirring and washing tank (not shown) is mixed into fresh water in the concentration adjusting tank A, and this mixed water is suitable for papermaking. The density is adjusted to a predetermined density (appropriate density). Then, the mixed water is sent to the laver paper making machine B, where paper leaf-like laver is made by a laver cage.
[0029]
Then, the wastewater (used laver-making water) discharged from the laver paper machine B is once collected and stored in the drainage pit D, and then driven by the pump D1 installed in the drainage pit D. And supplied to the laver-making water treatment apparatus C.
[0030]
-Explanation of the configuration of the seaweed water treatment device C-
Hereinafter, the configuration of the seaweed making water treatment apparatus C will be described. As shown in FIG. 1 and FIG. 2, the laver-making water treatment apparatus C includes a gantry 1 for accommodating each device. Is installed. Further, inside the gantry 1, a processing tank 3 as a storage tank, a processing water pump 4, a backwashing pump 5, a bubble generator 6 as a bubble supply unit, and a blower 7 as a blowing unit are accommodated. As shown in FIG. 2, the layout of each device accommodated in the gantry 1 is such that the processing tank 3 is provided on one side (the right side in the figure) of the gantry 1 and the other side of the gantry 1 (in the figure). On the left side), a treated water pump 4, a backwashing pump 5, and a bubble generator 6 are provided. The treated water pump 4 and the backwashing pump 5 are provided at the bottom of the gantry 1. The bubble generator 6 is installed above the backwashing pump 5. The blower 7 is installed above the processing tank 3. That is, the processing tank 3, the processing water pump 4, the backwashing pump 5, the bubble generator 6, and the blower 7 are installed in a single package inside the gantry 1. Hereinafter, each member will be described.
[0031]
The drum filter 2 is installed inside a filter cover 21 attached to the upper part of the gantry 1, and is formed by, for example, a metal mesh of # 60 (60 mesh) formed in a drum shape. The drum filter 2 is supported so as to be rotatable around the axis of the drum extending in the horizontal direction. The drum filter 2 is rotatable about the axis by receiving a driving force from a motor (not shown).
[0032]
The first supply pipe 91 extending from the discharge side of the pump D1 installed in the drain pit D is open inside the drum filter 2, and the waste water (used seaweed) stored in the drain pit D (Making water) is continuously supplied to the inside of the drum filter 2. As a result, coarse dust (nori leaf debris and other solid matter) contained in the laver paper water remains inside the drum filter 2, and the coarse dust is removed from the laver paper water.
[0033]
Further, a collecting pan 22 is provided below the drum filter 2, and the seaweed water passing through the drum filter 2 is collected by the collecting pan 22. Further, a second supply pipe 92 is connected to the recovery pan 22, and the laver drawing water in the recovery pan 22 flows down into the treatment tank 3 by the second supply pipe 92. .
[0034]
3A and 3B show the appearance of the processing tank 3, wherein FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a side view. As shown in these figures, the processing tank 3 has a substantially rectangular parallelepiped shape, and is composed of a relatively large container having a height of, for example, 1000 mm.
[0035]
In addition, as shown in FIG. 3B, a treated water outlet 31, a backwash water outlet 32, and a drain outlet 33 are formed near the lower end of the side wall of the treatment tank 3, respectively.
[0036]
The treated water outlet 31 is an opening for taking out purified water that has been treated inside the treatment tank 3. The treated water outlet 31 and the concentration adjusting tank A are connected by a treated water return pipe 93, and the treated water return pipe 93 is provided with the treated water pump 4. That is, by driving the treated water pump 4, the water inside the treated tank 3 is returned to the concentration adjusting tank A via the treated water return pipe 93. A discharge pipe 93a for discharging the treated water as required is connected to the treated water return pipe 93.
[0037]
The backwash water take-out port 32 is an opening for taking backwash water used for backwashing the drum filter 2. Therefore, a backwash water pipe 94 is connected to the backwash water outlet 32, and the backwash pump 5 is provided in the backwash water pipe 94. Further, the downstream end of the backwash water pipe 94 is open above the drum filter 2. For this reason, by driving the backwashing pump 5, a part of the water in the processing tank 3 is supplied from above the drum filter 2 to the inside of the drum filter 2 through the backwash water pipe 94. The coarse dust and the like adhering to the inner surface of No. 2 are washed away. In this way, the backwash water pipe 94 and the backwash pump 5 constitute the backwash water take-out means of the present invention. A backwash water recovery pan 23 is provided inside the drum filter 2 at a position opposite to the downstream end of the backwash water pipe 94, and the washed back trash is collected together with the backwash water. It is collected by the pan 23 and discharged from the drum filter 2.
[0038]
The drain outlet 33 is an opening that is opened when water in the processing tank 3 is drained when the processing tank 3 is washed.
[0039]
On the other hand, as shown in FIG. 3C, a bubble generation water take-out port 34 and a bubble supply port 35 are formed near the lower end of the other side wall of the processing tank 3, respectively.
[0040]
The bubble generation water outlet 34 is for extracting water used for generating bubbles in the bubble generation device 6 from the treatment tank 3. For this reason, the bubble generation water outlet 34 and the bubble generator 6 are connected by a bubble generation water outlet pipe 95, and the bubble generation water outlet pipe 95 is connected to the processing tank 3 by driving the bubble generator 6. Part of the water inside is taken out and introduced into the bubble generator 6.
[0041]
The bubble generator 6 includes a drive source such as a cascade pump inside, and generates fine bubbles by stirring and mixing the water and the air introduced from the bubble generation water extraction pipe 95. ing.
[0042]
The bubble generator 6 and the bubble supply port 35 are connected by a bubble supply pipe 96, and fine bubbles generated inside the bubble generator 6 are supplied into the processing tank 3 by the bubble supply pipe 96. It has become. The supply of air bubbles into the processing tank 3 causes bubbles in the water in the processing tank 3 to float on the water surface. At this time, impurities in the water (in addition to suspended substances, Fungi, plankton, and other organic substances) are taken into the air bubbles and float on the water surface. That is, only the impurities in the water float on the water surface by the foam separation.
[0043]
A baffle plate 39 is provided between the opening position of the bubble generation water outlet 34 and the opening position of the bubble supply port 35 to prevent the bubbles supplied from the bubble supply port 35 from short-circuiting to the bubble generation water outlet 34. Is provided.
[0044]
On the other hand, as shown in FIG. 3B, an air inlet 36 and a bubble outlet 37 are formed near the upper end of the side wall of the processing tank 3.
[0045]
The air introduction port 36 is an opening for introducing the air from the blower 7 into the processing tank 3. Therefore, the blow-in port 36 and the blower 7 are connected by a blower tube 97, and the blower 7 is driven to blow air at a predetermined wind speed from the blower tube 97 into the processing tank 3. It has become.
[0046]
Further, the bubble discharge port 37 is an opening for discharging the bubbles conveyed by the air blowing to the outside of the processing tank 3. Therefore, a bubble discharge pipe 98 is connected to the bubble discharge port 37.
[0047]
The ventilation path from the blower 7 will be specifically described. As shown in FIG. 3A, a baffle plate 38 is attached to the internal space of the processing tank 3 so that air from the blower 7 is not short-circuited from the air inlet 36 to the bubble outlet 37. That is, the baffle plate 38 is formed of a plate material extending from a substantially intermediate position between the formation position of the air introduction port 36 and the formation position of the bubble discharge port 37 on the inner surface of the processing tank 3 toward the center of the processing tank 3. A path from the air inlet 36 to the center of the processing tank 3 and a path from the center of the processing tank 3 to the bubble outlet 37 are formed. As a result, the air blown from the blower 7 flows in a substantially U-shape inside the processing tank 3 as shown by an arrow in FIG. 3A, and most of the air bubbles floating on the water surface are removed from the air outlet 37. To lead to.
[0048]
The opening position of the air inlet 36 is set slightly higher than the opening position of the bubble outlet 37. This is because, when the water level in the processing tank 3 rises abnormally, excess water overflows from the bubble discharge port 37 so that water does not enter the blower inlet 36 toward the blower 7.
[0049]
-Composition for sterilization and decolorization-
The present laver-making water treatment apparatus C employs the following configuration for sterilizing and decolorizing the water in order to improve the quality of the treated water.
[0050]
First, as a first means, an oxidant as a germicide is added to the inside of the drain pit D. Specific examples of the oxidizing agent include sodium hypochlorite (alkali hypochlorite) and chlorine dioxide (ClO). ₂ ) Is adopted. The oxidizing agent may be added by an adding operation by an operator, or an oxidizing agent adding device for automatically adding the oxidizing agent periodically may be provided.
[0051]
As a second means, an oxidizing agent is added to the inside of the processing tank 3. As this oxidizing agent, as in the case described above, sodium chlorite (alkali hypochlorite) and chlorine dioxide (ClO ₂ ) Is adopted. The addition of the oxidizing agent to the treatment tank 3 may be performed by an adding operation by an operator, or an oxidizing agent adding device that automatically adds the oxidizing agent periodically may be provided. .
[0052]
Further, as a third means, there is provided an electrolyzer 8 as an electrolyzer for electrolyzing water in the processing tank 3. That is, both positive and negative electrodes (made of titanium, platinum, etc.) are installed inside the processing tank 3 and a power source (battery) is connected to these electrodes. Since some (about 1%) salinity (salt in seawater) remains in the water in the treatment tank 3, electrolysis can be performed by energizing both electrodes. Chlorine will be evolved. Thereby, water is sterilized and decolorized by chlorine generated by the electrolysis.
[0053]
Further, as a fourth means, ozone may be applied instead of the air as a gas for generating bubbles in the bubble generator 6. In other words, the water in the processing tank 3 is supplied with ozone bubbles to sterilize and decolorize the water.
[0054]
-Explanation of the seaweed making water treatment operation-
Next, the operation of the laver-making water treatment apparatus C configured as described above will be described.
[0055]
First, the wastewater (used laver-making water) discharged from the laver paper machine B is temporarily stored in the drainage pit D, and then driven by the pump D1 installed in the drainage pit D. It is supplied to the inside of the drum filter 2 of the laver-making water treatment apparatus C by the first supply pipe 91. At this time, the drum filter 2 is not rotating, and the laver sheet water from which coarse dust has been removed by the drum filter 2 passes through the drum filter 2 and is collected by the collection pan 22.
[0056]
The laver drawing water collected in the collecting pan 22 then flows down into the processing tank 3 via the second supply pipe 92.
[0057]
On the other hand, in the bubble generation device 6, water and air (or ozone) introduced from the bubble generation water take-out pipe 95 are stirred and mixed to generate fine bubbles. 3. As a result, bubbles are generated in the water inside the processing tank 3, and the bubbles float on the water surface. At this time, impurities in the water are taken into the bubbles and float on the water surface. That is, only the impurities in the water float on the water surface by the foam separation.
[0058]
The blower 7 is driven in parallel with the foam separation operation, and the air generated by the blower 7 is sent from the air blowing pipe 97 into the processing tank 3. Due to this air blowing, the bubbles having taken in the impurities are conveyed as indicated by arrows in FIG. 3A, flow toward the bubble discharge port 37, and are forcibly discharged from the bubble discharge pipe 98 to the outside of the processing tank 3. Is done. As a result, the impurities are discharged to the outside of the processing tank 3 together with the bubbles. In this way, the impurities in the wastewater are continuously discharged from the processing tank 3, and the water remaining in the processing tank 3 becomes purified water containing almost no impurities.
[0059]
In parallel with such a wastewater purification operation, the treated water pump 4 is driven, and water (treated water) inside the treatment tank 3 is supplied to the concentration adjusting tank A via the treated water return pipe 93 as recycled water. Will be returned. In addition, in this concentration adjusting tank A, tap water is replenished in order to make up for the shortage of laver drawing water. As a drive control operation of the treated water pump 4, a water level sensor is provided in the treated tank 3, and the drive control of the treated water pump 4 is performed according to an output signal of the water level sensor. For example, a water level sensor for detecting that the water level in the treatment tank 3 has reached the upper limit (the water level at which the water surface reaches the bubble discharge port 37) and the water level at the lower limit (the water level at which the water surface reaches the bubble generation water outlet 34) And a water level sensor for detecting that the water level has reached the lower limit. When it is detected that the water level has reached the lower limit, the treated water pump 4 is stopped. Is controlled to drive.
[0060]
Further, as described above, since the present laver-making water treatment apparatus C employs various means for sterilizing and decolorizing water, colorless and transparent water is generated with almost no germs and the like.
[0061]
Further, a water level sensor (not shown) is provided inside the drum filter 2, and when the water level in the drum rises to a predetermined water level or more due to clogging of the drum filter 2, the backwashing operation of the drum filter 2 is performed. Is This backwashing operation is performed by driving the backwashing pump 5 and rotating the drum filter 2. That is, a part of the water in the treatment tank 3 is supplied from above the drum filter 2 toward the inside of the drum filter 2 through the backwash water pipe 94, whereby the coarse dust adhering to the inner surface of the drum filter 2 is removed. Etc. are to be washed away. The washed-out coarse dust is collected in the backwash water recovery pan 23 together with the backwash water and discharged from the drum filter 2. The rotation speed of the drum filter 2 during this backwashing operation is 1 rpm, the backwash time is about several tens of seconds, and about 10 liters of backwash water is used. Further, the backwashing operation of the drum filter 2 may be performed at predetermined time intervals without providing the water level sensor.
[0062]
By performing the above operations continuously, the amount of backwash water used is extremely small, and the operation of generating recycled water can be performed with high efficiency. That is, in the operation of generating the recycled water according to the present embodiment, the secondary treatment (the treatment in the treatment tank 3) does not employ the purification by filtration, so that the backwash is unnecessary. In the past, a large amount of water was required for backwashing of a filtration device that performed secondary treatment, which greatly hindered the "water saving" that is the original purpose of recycling water. According to the embodiment, most of the wastewater stored in the treatment tank 3 can be generated as recycled water, and significant water saving can be realized in the entire dried laver production system.
[0063]
In the present embodiment, an oxidizing agent as a germicide is added to the inside of the drain pit D, which is a stage before the primary treatment. For this reason, it becomes possible to sterilize the drum filter 2 and each pipe, and it is possible to sterilize the entire laver-making water treatment apparatus C, and to perform the reaction time with the sterilizing agent and the stirring time of the sterilizing agent in the wastewater. Therefore, the wastewater can be sufficiently sterilized and decolorized.
[0064]
In addition, air bubbles can be discharged by blowing air from the blower 7, and unnecessary gas in the processing tank 3 can be discharged by the blowing air. That is, both of these discharge operations can be performed by one blower 7, and the apparatus can be simplified and the cost can be reduced.
[0065]
-Experimental example-
Next, a description will be given of an experimental example performed to confirm the quality of the recycled water generated by the laver-making water treatment apparatus C according to the present embodiment. In this experimental example, the water quality of the wastewater discharged from the laver papermaking machine B when the purification treatment of the wastewater was not performed, and the laver in a state where the processing operation by the laver papermaking water treatment apparatus C was continuously performed for a predetermined time. This was performed by comparing the water quality of the wastewater discharged from the paper machine B. The results are shown in Table 1 below.
[0066]
[Table 1]

[0067]
As is clear from the experimental results, when the purification treatment was performed using the seaweed-making water treatment apparatus C according to the present embodiment, it contained almost no general bacteria or Escherichia coli, and was almost colorless and transparent and had good water quality. It can be seen that recycled water is generated.
[0068]
-Other embodiments-
In the above-described embodiment, a case has been described in which the present invention is applied as the nori sheeting water treatment apparatus C in the dried nori production system. The present invention is not limited to this, and can also be applied to a treatment apparatus that generates suspended water and the like by removing suspended substances and the like in wastewater used for other food processing.
[0069]
In the above-described embodiment, as means for sterilizing and decolorizing treated water, “addition of oxidizing agent to inside of drainage pit D”, “addition of oxidizing agent to inside of treatment tank 3”, “treatment tank 3” Electrolysis of water in the inside "and" supply of ozone by the bubble generator 6 ". The present invention is not limited to this, and one or more of these means may be selectively implemented.
[0070]
Furthermore, in the laver-making water treatment apparatus C according to the above-described embodiment, the drum filter 2 is installed above the gantry 1. The present invention is not limited to this, and the drum filter 2 may be installed beside the gantry 1 when the installation space of the laver-making water treatment apparatus C is limited in height. In this case, a pump for transferring the wastewater filtered by the drum filter 2 to the inside of the processing tank 3 is required.
[0071]
In addition, the filter used in the primary treatment is not limited to the drum filter 2, and various filters such as an inclined plate type screen can be applied.
[0072]
【The invention's effect】
As described above, in the present invention, foam separation is used as a means for enabling reuse of used water used for food processing, and blowing is performed on bubbles floating on the water surface by the foam separation. Thereby, the impurities in the treated water are forcedly transported together with the bubbles to the outside of the storage tank. For this reason, since the purification of the used water by filtration is not adopted, the backwashing becomes unnecessary. In the past, a large amount of water was required for backwashing, which greatly hindered the "water saving" that is the original purpose of recycling water. Most of the used water that has been used can be generated as recycled water, and it is possible to generate recycled water with good water quality while realizing significant water saving in the food processing system as a whole.
[0073]
In addition, ozone may be used as a gas continuously supplied to the used water by the bubble supply means, or a bactericide may be added to the used water stored in the storage tank or to the used water in the stage before the primary treatment. If the electrolysis means is provided to electrolyze the used water stored in the storage tank, the sterilization and decolorization of the treated water can be performed effectively, and the water can be recycled with good quality. Water can be generated.
[0074]
Furthermore, when a mesh type filter is provided as a configuration for performing the primary treatment, the mesh type filter is installed above the storage tank, and the used filter from which the coarse dust is removed in the mesh type filter is used. When the water is dropped into the storage tank, a special transport drive source for transporting the used water from the filter into the storage tank is not required, and a low-cost reclaimed water generator is provided. It can be realized. In addition, it is possible to reduce the installation space of the recycled water generation device.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an installation state of a concentration adjusting tank, a laver papermaking machine, and a laver papermaking water treatment apparatus in a dried laver production system according to an embodiment.
FIG. 2 is a view showing a laver-making water treatment apparatus.
3A and 3B are views showing the appearance of a processing tank, wherein FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a side view.
FIG. 4 is a block diagram for explaining an outline of a dried laver production system.
[Explanation of symbols]
C Seaweed water treatment equipment (recycled water generation equipment)
2 Drum filter (filter)
3 treatment tank (storage tank)
5 Backwashing pump
6 Bubble generator (bubble supply means)
7 blower (blowing means)
8. Electrolysis equipment (electrolysis means)
94 Backwash water piping

Claims (9)

In a recycled water generation device for processing used water used for food processing so that it can be reused,
A storage tank for storing used water from which coarse dust has been removed by primary treatment,
Bubble supply means for continuously supplying gas to the used water stored in the storage tank in a bubble form,
Blowing means for blowing air for transporting bubbles floating on the surface of the used water with the gas supply from the bubble supply means on the water surface toward the outside of the storage tank,
An apparatus for generating recycled water, wherein impurities in the used water are discharged to the outside of the storage tank together with bubbles, and the treated water remaining in the storage tank can be taken out as recycled water. The recycled water generating apparatus according to claim 1,
In the primary treatment, a recycled water generation device is configured to remove coarse dust in used water by a mesh-type filter. The recycled water generation device according to claim 2,
Reclaimed water characterized by being provided with a backwashing water takeout means for taking out part of the treated water in the storage tank and making it usable as backwashing water for backwashing a mesh-type filter; Generator. The recycled water generation device according to claim 1, 2 or 3,
The gas continuously supplied to the used water by the bubble supply means is air or ozone. The recycled water generation device according to any one of claims 1 to 4,
A recycled water generating apparatus characterized in that a disinfectant is added to used water stored in a storage tank. The recycled water generation device according to any one of claims 1 to 5,
An apparatus for generating recycled water, comprising an electrolyzing means for electrolyzing used water stored in a storage tank. The recycled water generation device according to any one of claims 1 to 6,
A recycled water generating apparatus characterized in that a bactericide is added to used water at a stage prior to a primary treatment. The recycled water generation device according to claim 2,
The mesh-type filter is installed above the storage tank, and the used water from which coarse dust has been removed in the mesh-type filter is configured to be dropped and supplied into the storage tank. Recycling water generator. A recycled water generation method implemented in the recycled water generation device according to any one of claims 1 to 8,
The used water from which coarse dust has been removed by the primary treatment is stored in a storage tank, and gas is continuously supplied to the used water in the form of bubbles, and the gas is supplied and floats on the surface of the used water. Blowing is performed to convey the generated bubbles to the outside of the storage tank on the water surface, thereby discharging the impurities in the used water to the outside of the storage tank together with the bubbles, and treating the treated water remaining in the storage tank. A method for producing recycled water, wherein the method is taken out as recycled water.

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