JP4465669B2 - Washing water recycling equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a water recycling apparatus used for cleaning an apparatus mainly in a production process using organic substances such as food industry and brewing industry.
[0002]
[Prior art]
Conventionally, the cleaning water of the apparatus is cleaned using fresh water such as tap water, and the cleaning waste water is discharged to the waste water treatment apparatus without being treated. During this time, the cleaning apparatus tends to be automated with the automation of the apparatus. The current automatic cleaning apparatus performs uniform cleaning regardless of the degree of contamination of the cleaning surface, and therefore consumes a larger amount of water than manual cleaning by an operator. In addition, when a large apparatus is automatically cleaned, a large amount of washing water is required, so that the amount used for the large amount of water rises and wastewater treatment costs are required. In addition, the introduction of automatic cleaning increases the size of the wastewater treatment facility, which increases the facility cost.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to reduce the consumption of water as washing wastewater and to store the wastewater without deteriorating the quality of the recycled water, thereby reducing the burden on the wastewater treatment facility. It is to provide a cleaning water recycling apparatus.
0004
[Means for Solving the Problems]
According to claim 1 of the present invention, in the washing water recycling apparatus, the recovery tank (1) for storing the finish treated water and the new water tank (17) for storing the fresh water are connected via the cleaning water switching valve (3). Selectively connected to the cleaning tank (4) and using this cleaning tank (4) to supply cleaning water to the cleaning device (8) (18), and a recovery pump (13) to recover cleaning waste liquid The recovery route (19) for transporting the treated water from the recovery tank (13) through the filtration device (14), the supply route (18) and the recovery route (19) without passing through the cleaning device (8) A bypass path (20) to be connected is provided, and the chemical solution is added to the circulation path (21) constituted by the supply path (18), the recovery path (19), and the bypass path (20) without passing through the cleaning device (8). A bacteriostatic or bactericide supply device (30) comprising a tank (22) and a metering tank (23) is provided.
[0005]
According to claim 2 of the present invention, in the recycling apparatus 2 according to claim 1, an organic substance adsorbing device (15) is provided in the recovery path (19).
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a flow diagram of a washing water recycling apparatus according to the present invention.
FIG. 2 is a flow chart of a continuous batch type adsorption apparatus.
[0007]
At the beginning of the primary cleaning, the finishing water stored in the collection tank 1 is used. Finished treated water is introduced from the recovery tank 1 to the cleaning water pump 4 via the valve 2a and the cleaning water switching valve 3. Finished treated water pumped by the cleaning pump 4 is ejected from the ejection nozzles 9a and 9b in the cleaning apparatus 8 via the bypass valve 5 and the valve 6 or 7, and the apparatus to be cleaned 10 is cleaned. In the apparatus to be cleaned 10, there are apparatuses such as a solid culture apparatus and a rice wheat steaming apparatus, but it is also possible to clean a single apparatus or a plurality of apparatuses simultaneously.
[0008]
The cleaning waste liquid discharged from the apparatus to be cleaned 10 is sent from the valve 11 via the bypass bubble 12 to the filtration apparatus 14 by the recovery pump 13. The filtration device 14 may have a performance enough to filter out suspended substances that are insoluble solids. When performing sophisticated filtration, it is possible to incorporate a microfiltration device, an ultrafiltration device, or the like. By passing through the filtering device 14, the cleaning waste liquid becomes finished treated water, and is recovered into the recovery tank 1 via a cartridge-type adsorption device 15 and a switching valve 16, which will be described later. The collected finishing water is continuously recycled for cleaning.
[0009]
At the end of the primary cleaning, the generated cleaning waste liquid is filtered by the filtering device 14, and then drained from the drain switching valve 16. That is, since the final treated water is used for cleaning while being filtered, and finally drained, the amount of waste water and dirt are small, and the burden of wastewater treatment is reduced.
[0010]
After the treated water in the recovery tank 1 is drained, finish cleaning, which is secondary cleaning, is performed. Fresh water in the fresh water tank 17 that stores fresh water such as tap water is introduced into the washing pump 4 from the valve 2b via the washing water switching valve 3. The fresh water pumped from the cleaning pump 4 is jetted from the nozzles 9a and 9b of the cleaning device 8 from the bypass valve 5 or the valve 6 or 7 to finish and clean the device 6 to be cleaned.
[0011]
The finished cleaning waste liquid discharged from the apparatus to be cleaned 10 is sent from the valve 11 to the filtration apparatus 14 by the recovery pump 13 via the bypass valve 12. By passing through the filtration device 14, the finishing washing waste liquid becomes finished treated water, and is collected into the collection tank 1 via the drainage switching valve 16. The collected finishing water is continuously recycled for finishing washing.
[0012]
A path for transporting cleaning water from the recovery tank 1 and the fresh water tank 12 to the cleaning device 8 using the cleaning pump 4 is defined as a supply path 18. A path for transporting treated water from the recovery pump 13 to the recovery tank 1 via the filtration device 14 is referred to as a recovery path 19. A bypass path 20 is defined between the bypass valve 5 and the bypass valve 12 that connect the supply path 18 and the recovery path 19 without going through the cleaning device 8. A route constituted by the supply route 1, the recovery route 19 and the bypass route 20 without passing through the cleaning route 8 is defined as a circulation route 21.
[0013]
When the finish treated water is collected in the collection tank 1 and the finish cleaning is completed as the secondary cleaning, the bypass valve 5 and the bypass valve 12 are switched. Finished treated water in the collection tank 1 circulates in the circulation path 21. A supply device 30 for adding a bacteriostatic agent or a bactericide by the chemical tank 22 and the metering pump 23 is configured between the recovery tank 1 and the washing water switching valve 3. Various agents can be used as a bacteriostatic agent or a bactericide, but when used for washing food production machines, it is preferable to use sodium hypochlorite specified for food additives. . The above-described supply device 30 for adding a bacteriostatic agent or a bactericidal agent is not particularly limited as long as it is a pipe in the circulation path 21 in which the finish treated water is circulated.
[0014]
By adding sodium hypochlorite to the finish treated water at a concentration of about 5 ppm and circulating for 5 to 10 minutes, the piping in the circulation path 14 and the inside of each device are bacteriostatically or sterilized.
Sodium hypochlorite, which had a concentration of about 5 ppm, reacts with soluble organic matter in the finishing water and is reduced to about 2 ppm. The final treated water containing about 2ppm of remaining sodium hypochlorite is stored in the recovery tank 1, so it is used for the next primary cleaning while preventing the growth of microorganisms and maintaining the water quality. can do.
[0015]
Finished treated water containing about 2ppm of sodium hypochlorite is drained after the remaining sodium hypochlorite is consumed by contact with organic substances in the next primary cleaning. There is no impact on wastewater treatment by biological treatment.
0016
Taking a solid culture device as an example, the conventional automatic cleaning used about 6t of fresh water and discharged about 6t of waste water. In the apparatus of the present invention, temporary cleaning is performed using 2t of the finishing treated water collected in the previous cleaning, and the entire amount is drained. Next, finish cleaning with 2t of fresh water and collect the whole amount for the next primary cleaning. For one cleaning, 2t of fresh water and 2t of drainage are sufficient. For this reason, the amount of new water and wastewater will be 1/3 of the conventional amount.
[0017]
As a method for recovering the finished treated water in a highly clean state, it is possible to incorporate a microfiltration device and an ultrafiltration device or a microfiltration device and a reverse osmosis membrane device in the filtration device 14. However, the ultrafiltration device and the reverse osmosis membrane device are high in apparatus cost and maintenance cost, and particularly require maintenance techniques.
[0018]
The above-described cartridge-type adsorbing device 15 can be easily exchanged by filling the column with an adsorbent such as various organic polymers adsorbing organic substances and porous inorganic sintered bodies. By providing the cartridge type adsorption device 15 between the filtration device 8 and the drainage switching valve 16, it is possible to collect the finished treated water in a highly clean state. If the cartridge-type suction device 15 is used, it can be easily replaced, and no technique is required for maintenance.
[0019]
Further, when draining, similarly, by providing the cartridge type adsorption device 15, drainage with higher cleanliness can be performed. If the waste water has a high cleanliness, a large amount of waste water can be treated even in an existing waste water treatment device, so that it is not necessary to enlarge the waste water treatment device when the device is enlarged. In addition, since the drainage load on the wastewater treatment apparatus is reduced and stabilized, the wastewater after the wastewater treatment can be discharged stably.
[0020]
In the case of using an adsorbent that is not suitable for the method of filling the column and using it, a continuous batch type adsorption device 24 as shown in FIG. 2 may be provided. The continuous batch type adsorption device 24 includes a supply switching valve 25, mixing tanks 26a and 26b, a discharge switching valve 27, and an adsorbent filtering device 28.
[0021]
Finished treated water supplied from the filtration device 14 of the recovery path 19 is introduced into one of the mixing tanks 26a and 26b from the supply switching valve 25, and is mixed with the adsorbent by the stirring blades 29a and 29b, thereby causing soluble contamination. The substance is adsorbed and removed. Supply of the adsorbent to the mixing tanks 29a and 29b may be automatic quantitative supply. After the fixed amount of finished treated water is supplied to the mixing tank 26b, the supply switching valve 25 is switched to supply the fixed amount of finished treated water to the mixing tank 26b.
[0022]
While supplying a certain amount of finished treated water to the mixing tank 26b, the finished treated water and the used adsorbent in the mixing tank 26a are discharged from the discharge switching valve 27 into the adsorbent filtering device 28. The treated water and the used adsorbent are separated by the adsorbent filtration device 28, and the finished treated water is collected or drained from the drainage switching valve 16 to the collection tank 1. The used adsorbent is discharged from the adsorbent filtration device 28.
[0023]
When finishing treatment water and used adsorbent are discharged from the mixing tank 26a, the finishing treatment water is supplied again from the supply switching valve 25 to the mixing tank 26a, and the mixing tank 26b is used with the finishing treatment water from the discharge switching valve 27. The spent adsorbent is discharged to the adsorbent filtering device 28. Thus, by using the mixing tanks 26a and 26b alternately, it is possible to continuously treat the finish treated water.
[0024]
In the above embodiment, the cleaning switching valve 3, the bypass valve 5, the valves 6, 7, the bypass valve 12, the drain switching valve 16, the supply switching valve 25, and the discharge switching valve 27 can be electromagnetic valves.
[0025]
【The invention's effect】
By reusing the treated treated water while filtering, the amount of fresh water used and the amount of drainage can be greatly reduced. Moreover, the used fresh water can be stored without deteriorating the water quality, and can be reused as the final treated water for the next washing. By drastically reducing the amount of wastewater, it is possible to expand the facilities and introduce automatic cleaning without increasing the size of the wastewater treatment facility.
[0026]
By providing an adsorption device that is easy to maintain, it becomes possible to increase the cleanliness of the finish treated water. Moreover, since the cleanliness of waste water can be increased, the load on wastewater treatment can be greatly reduced.
[0027]
As a result of the above, the wash water can be recycled without reducing the consumption of fresh water by recycling the wash water, and can be stored without deteriorating the quality of the recycled water, greatly reducing the load on the wastewater treatment facility. Recycling equipment can be provided.
[Brief description of the drawings]
FIG. 1 is a flow diagram of a cleaning water recycling apparatus according to the present invention.
FIG. 2 is a flow diagram of a continuous batch type adsorption apparatus.
[Explanation of symbols]
1 Collection tank
2a, 2b valve
3 Washing water switching valve
4 Cleaning pump 5 Bypass valve 6a, 7b Valve 8 Cleaning device
9a, 9b nozzle
10 Equipment to be cleaned
11 Valve
12 Bypass valve
13 Collection pump
14 Filtration equipment
15 Cartridge-type suction device
16 Drain switch valve
17 New water tank
18 Feeder
19 Collection route
20 Bypass path
21 Circulation pathway
22 Chemical tank
23 Metering pump
24 Continuous batch adsorption equipment
25 Supply switching valve
26a, 26b mixing tank
27 Discharge switching valve
28 Adsorbent filtration device
29a, 29b stirring device
30 Feeder

Claims (2)

A recovery tank (1) for storing the treated water and a fresh water tank (17) for storing fresh water are selectively connected to the cleaning pump (4) via the cleaning water switching valve (3). Supply path (18) for transporting cleaning water to the cleaning device (8) using (4), and a recovery tank (13) from the recovery pump (13) for recovering cleaning waste liquid via the filtration device (14) A recovery route (19) for transporting the treated water to the water and a bypass route (20) connecting the supply route (18) and the recovery route (19) without passing through the cleaning device (8) are provided. 8) Bacteriostatic consisting of chemical tank (22) and quantitative tank (23) in circulation path (21) consisting of supply path (18), recovery path (19) and bypass path (20) without going through Cleaning water recycling device with a chemical or disinfectant supply device (30). The apparatus for recycling linear water according to claim 1, wherein an adsorption device (15) for organic matter is provided in the recovery path (19).

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