JPH0753750Y2 - Floating separation type purification device - Google Patents

Description

[Detailed description of the device]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flotation separation type purification device capable of separating pollutants with high efficiency.

2. Description of the Related Art A floating separation type purifying apparatus deposits bubbles on the surface of bubbles by mixing bubbles into the raw water, or fine bubbles attach to the contaminants to levitate the contaminants and float them. This is a purifying device that separates pollutants (hereinafter referred to as polluted bubbles) from water and discharges them to the outside, and there are various types (for example, JP-A-55-49185 and JP-A-6-1956).
Year 0, 63491). There are a forced separation type and a natural separation type as a separation method in the contaminant separation section where the contaminants float and gather once. In the former forced separation type, in the latter natural separation type configuration, a scraping machine or the like is provided in the vicinity of the pollutant separation section to scrape polluted bubbles and support discharge to the outside. Therefore, a specific configuration of the latter natural separation type will be described with reference to FIG. 6 (FIG. 6A is a top view of FIG. The levitation separation type purification device includes a main body 31, a contaminant separating section 32 provided in an upper part of the main body, a raw water inlet 33 and an aeration section 34 provided in a lower part of the main body (not shown, but raw water inflow). There is also an air supply device installed inside the pipe) and the treated water outlet 35, and a water level adjusting weir 36 attached to the treated water outlet 35 and provided with a water level adjusting portion 361 (in this example, a screw-shaped upper portion). The water level is adjusted by moving the engaged cylinder 361 up and down), and the treated water overflowing from the water level adjusting weir 36 is separated into the reflux pipe 37 and the contaminant separating unit 32. A discharge pipe 38 for discharging the polluted foam D thus formed is generally configured.

By the way, it is a reality that the above-mentioned conventional natural separation type floating separation type purification device cannot efficiently separate the polluted foam D from water. In order to efficiently separate and discharge the polluted foam D from water, it is necessary to control the water level of the main body 31 with high accuracy (preferably within 2 mm).
If this control is incomplete and the water level is low, contaminant D
Is not discharged, but is redissolved and refluxed from the reflux pipe 37 together with the treated water. On the contrary, if the water level is high, not only the pollutant D but also clean water will be discharged from the discharge pipe 38 to the outside,
I am forced to replenish water frequently. Example configuration (Fig. 6)
Control is performed by raising and lowering the cylinder 361 of the water level adjusting weir 36. However, the cause of the water level change that requires such water level control is the change in the flow rate of the pump 20 due to the change in voltage or the like, and the air to the air diffuser 34. There are fluctuations in the supply amount, and as shown in FIG. 7, there is a rise in the water level due to bubbles. It is virtually impossible to always manually control the water level against such indefinite fluctuation factors. Of course, this does not cause a problem when the floating separation type purification device is used and the discharge may contain a large amount of water. However, for example, when seafood is raised in an aquarium, cultivated, or stored as it is kept alive, a circulation system (that is, a reusable system) in which raw water is filtered by a filtration device and returned to the aquarium
It is necessary to use the purification device of. However, in this case, since the field area occupied by the filtration apparatus becomes large, a flotation separation type purification apparatus is an effective means for reducing the field area to about half or less. As shown in FIG. 5, the raw water sucked by the pump 20 from the water tank 10 is floated and separated by the purification device 30.
In this case, the contaminant D is forcibly separated into water and the contaminant D is discharged to the outside, while the water is further filtered by the filter device 40 and returned to the water tank 10. However, as described above, in the conventional floating separation type purification apparatus of the natural separation type, even the water is discharged together with the purification, and the water is reduced or all the contaminants reach the filtering apparatus 40 without any need. become. This poses a serious problem in maintaining the health of fish and shellfish and in economic terms. In particular, in the case of an aquarium of seafood, the raw water has a high viscosity of the pollutant bubbles D spreading in the pollutant separation section 32, so that the natural separation method is almost impossible. Therefore, in such a case, a forced separation type using a scraping machine is used. However, even with this forced separation type, there are new problems such as an increase in the number of steps for power control and maintenance of the scraping machine, and an unscraped surface due to the shaking of the water surface generated by the foam scraping machine itself. The present invention focuses on the above-mentioned problems of the prior art, and even if it is a natural separation type, it separates pollutants with high efficiency,
Moreover, it aims at providing the floating separation type | formula purification apparatus which can be discharged | emitted.

In order to achieve the above object, the flotation separation type purification apparatus according to the present invention will be described with reference to FIG. 1 in the contaminant separation section 32 of the flotation type purification apparatus. An overflow port 41 that joins the reflux pipe 37 of the floating separation type purification device is provided, and above the overflow port 41, the contamination bubble D is prevented from flowing into the overflow port 41 and the contamination bubble D is discharged. A discharge cover 42 that rides over to the side is provided.
The upward flow of water from the lower side of the overflow port 4
The baffle plate 43 for preventing the direct inflow to the No. 1 is provided.

Originally, the idea of obtaining treated water from the pollutant separation section 32 as in the above-mentioned configuration was not common knowledge in this type of apparatus. That is, according to the above-mentioned structure, as shown in FIG. 3, the raw water reaches the pollutant separation part 32 as an upward flow. At this time, since there is the baffle plate 43 below the overflow port 41, it does not flow directly into the overflow port 41. The upper part of the polluted water in the pollutant separation unit 32 is the polluted foam D, and the lower part is water. The overflow port 41 is submerged in such lower water, and a part of the water becomes overflow water ω. The amount of the overflow water ω is generally determined by the water level adjusting weir 36, but as described above, it varies due to various factors of varying water level. In the discharge cover 42, the contaminated foam D overflows the outlet 4
Since the overflow water ω is water from the pollutant separation section 32, it also has no remarkable dirt because it also serves as a baffle that prevents the water from flowing into the water 1. Further, the amount thereof is small, and when it joins the treated water in the reflux pipe 37, it is diluted. On the other hand, the polluted foam D is pushed by the rising water flow from below and is also carried on the overflow water flow to ride over the upper surface of the discharge cover 42 and is discharged to the outside from the discharge pipe 38.

Embodiments will be described below with reference to the drawings. First
The embodiment is shown in Fig. 1 (Fig. 1 (a) is a top view of Fig. 1 (b)).
Further, as shown in FIG. 2 which is a partially enlarged view of FIG. 1, the contaminant separation unit 32 of the flotation separation type purification device 30 which is a natural separation type together with the water level determination weir 412 of the contaminant separation unit 32 in the prior art. A water level determination weir 411 is provided. The water level determination weir 411 is provided lower than the water level determination weir 412. A baffle plate 43 is provided below the water level determining weir 411 on the liquid side, and the water level determining weir 41 is provided on the opposite side to the liquid side.
The levitation separation type purification device 30 for overflow water ω from 1
An auxiliary reflux pipe 44 is provided to join the original reflux pipe 37. Further, above the water level determining weir 411, there is provided a discharge cover 42 over which the polluted foam D rides. This discharge cover 4
The liquid side end of 2 is closer to the water level determining weir 4 than the liquid side end of the baffle plate 43.
Located on the 11 side and submerged to the upper level of the baffle plate 43,
The water outlet 41 is provided at the liquid side end of the discharge cover 42. In the above configuration, the overflow port 41
Is a gap between the baffle plate 43 and the liquid side end of the discharge cover 42, a gap between the water level determining weir side 411 and the lower surface of the discharge cover 42,
It is composed of an auxiliary reflux pipe 44. Therefore, the separated water also flows in this order to reach the reflux pipe 37, where it joins the normal treated water. On the other hand, the polluted foam D is pushed by the rising water flow from below, and is also carried on the water flow of the overflow water to pass over the upper surface of the discharge cover 42 and is discharged to the outside from the discharge pipe 38. The second embodiment is shown in FIG. This is the first
The main part in the embodiment is integrally configured. That is, the overflow port 41, the discharge cover 42, and the baffle plate 43 are integrally formed. Items of other examples are listed as follows. (1) In the first embodiment, the water level determining weir 412 in the prior art was kept alive, but the water level determining weir 412 is eliminated according to the overflow flow rate and the degree of various uncertain factors of water level variation, and all the water level determining weirs 411. There is also a need to do. (2) In the second embodiment, as shown in FIG. 4, the box shape is used. However, for example, the overflow port 41 is formed into a curved shape, and the discharge cover 42 and the baffle plate 43, which are also curved surfaces, are provided above and below the overflow port 41. It may be arranged freely, for example. (3) In the second embodiment, the integral type is used, but the overflow 41 and the discharge cover 42 may be integrated or the overflow port 41 and the baffle plate 43 may be integrated partially. The experimental results of the above-mentioned examples and points to be noted from the experiments will be described below. (Results) In the example, when the floating separation type purification device having a capacity of 800 liters was used to purify the flat culture seawater having a total water amount of 5 m ³ , about 20 l of the polluted foam D was discharged per day.
Its chemical oxygen demand (COD) is about 600 ppm (total COD excluded is 12 g per day). This is a value that is 2 to 10 times higher than the similar test result of the conventional device. Next, when the flat culture was carried out for 6 months using the device of the present invention having a capacity of 1/10 of the water tank and the filtration device having a capacity of 1/3 of the water tank, supplementation of seawater was insignificant. (As far as the applicant is aware, there are no reports of such successful aquaculture). (Points to be noted) (1) Speaking of the relation with the water level adjusting weir 36, the water level height of the water level adjusting weir 36 depends on the type of the pollution bubble D, but the height of the surface of the discharge cover 42 overcoming the contaminants and the overflow. It is close to the water level of the mouth 41, and in the first embodiment, it is 2 to 30 mm from the height of the surface of the discharge cover 42 over which contaminants pass.
The effect is that the lower part is good. If it is higher than this, pure water comes to flow out from the upper surface of the discharge cover 42, and if it is lower than this, the polluted foam D becomes difficult to be discharged and forced separation by a scraper or the like becomes necessary. . (2) Basically, the position of the baffle plate 43 is effective if it is lower than the set water level (that is, the height of the surface of the discharge cover 42 over which the contaminants pass). However, from the set water level 5 mm to 3
Ideally, the lower part is about 00 mm. If the position of the baffle plate 43 is too high, it becomes difficult for the dirty bubbles D on the surface of the water to come into contact with the baffle plate 43, and it becomes difficult to move the horizontal direction turbulent flow at this contact portion to hinder the growth of the dirty bubbles D. Come here. Therefore, the discharge of the polluted foam D does not go smoothly. On the contrary, baffle plate 4
If the position of 3 is too low, air bubbles will rise around the baffle plate 43 and the effect of the baffle plate 43 in the present invention will be halved.

As described above, according to the flotation separation type purification apparatus of the present invention, the contaminant separation section is provided with an overflow port which joins the reflux pipe, and a discharge cover 42 above the overflow port.
Since the lower baffle plate 43 is appropriately arranged, the contaminant can be separated and discharged with high efficiency even in the case of the natural separation type floating separation type purification device. For example, in the conventional technology, even if it is a purification system for water for fish farming, to which it was difficult to apply the floatation separation type purification apparatus of the prior art, if the floatation separation type purification apparatus of the present invention is attached, it is possible to maintain the health of fish and shellfish. It is possible to easily achieve enhancement, reduction of replenishment of water, omission of the forced discharge mechanism, downsizing of the filtering device, and the like.

[Brief description of drawings]

1 and 2 are views of a floating separation type purification apparatus according to a first embodiment of the present invention, wherein FIG. 1 (a) is a top view and FIG.
Is a front view, FIG. 2 is a partially enlarged view, FIG. 3 is a diagram for explaining the operation of the present invention, FIG. 4 is a partially enlarged view of the flotation type purification apparatus according to the second embodiment, and FIG. FIG. 6 is a diagram of a circulation type purification system when a flotation type purification device is installed in fish and shellfish aquaculture, etc. FIG. 6 is a diagram of an example of a conventional flotation type purification device, (a) is a top view, ( b) is a front view, and FIG. 7 is a view for explaining the conventional operation. 30 ...... Floating separation type purification device 31 ...... Main body 32 …… Contaminant separation part 33 …… Raw water inlet 34 …… Aeration part 35 …… Treatment water outlet 36 …… Water level adjusting weir 37 …… Recirculation pipe 38 ・ ・ ・… Discharge pipe 41 …… Overflow port 42 …… Discharge cover 43 …… Baffle plate D …… Contaminated foam

Claims (1)

[Scope of utility model registration request] 1. An overflow port 41, which joins a reflux pipe 37 of the flotation type purification device, is provided in a pollutant separation part 32 of the flotation type purification device, and a polluted bubble D is provided above the overflow port 41. A discharge cover 42 is provided to prevent the polluted foam D from flowing into the overflow port 41 and to pass over to the discharge side. Further, below the overflow port 41, a rising water flow from below directly flows into the overflow port 41. A flotation separation type purification device characterized by a structure including a baffle plate 43 for preventing such a situation.