JPH0623383A - Water purifying apparatus - Google Patents

Abstract

PURPOSE:To easily establish a water purifying system to an existing basin and to perform the maintenance control thereof after establishment in a technically and economically advantageous manner. CONSTITUTION:A water purifying system is constituted of the purifying structure main body 3 arranged to an almost central part of a basin 2, the suction port 4 continued to the purifying structure main body 3 to introduce the circumferential water into the main body 3 and the biological membrane tank unit 5 and inherent bacteria supply cartridge moored in the circumferential water of the purifying structure main body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention utilizes the water purification power of specific bacteria to purify the water quality of a large-capacity artificial pond. The present invention relates to a water purification system in which a bacteria unit and a biofilm tank unit are moored.

[0002]

2. Description of the Related Art As a conventional water purification system for artificial ponds of this kind, a bioreactor is installed on the land around the artificial pond, and a device for forcibly causing circulation in the pond water and aeration are generated. The present inventors have developed a device in which devices are individually installed.

[0003]

However, in such a conventional water purification system, a large-scale civil engineering work must be carried out in order to install various devices, and there is a difficulty in cost, and There is a limit to the capacity of the aeration system to be installed, and there are technical and economical problems with the circulation filtration system adopted.

Particularly, in a closed artificial pond, a high level of eutrophication causes abnormal growth of algae.

There are many substances that cause eutrophication, but nitrogen and phosphorus are the most important substances that must be suppressed. By controlling these, the internal productivity can be reduced. , Is the shortest method to achieve the purpose of water purification.

There is a physicochemical method using a chemical as a method of removing these nutrient algae, but it causes secondary pollution such as treatment of facilities and generated substances and the cost thereof, and is always put to practical use in ordinary ponds and the like. Not easy to do.

[0007] In order to solve such a problem, the inventors of the present invention have conducted an earnest research by focusing on the fact that the biological treatment method has no fear of causing secondary pollution and no fear of environmental pollution. When I was conducting an experiment, the biofilm utilization method,
We have found that the water purification of closed water has the following advantages.

(1) Suitable for removing nitrogen. Nitrifying bacteria and denitrifying bacteria, which have a low specific growth rate, cannot be washed away in aeration tanks such as the activated sludge method, but they can live in biofilms regardless of the stagnant time of wastewater. I understand.

(2) The variety of microorganisms involved in purification is high. This is because biodiversity increases, interactions are complicated, stable ecosystems are constructed, and it is possible to cope with changes in environmental conditions.

(3) Depending on the degree of purification, a dominant microbial membrane suitable for each is constructed.

(4) The food chain becomes long. This is because the number of organisms having a higher nutritional level than the number of organisms that prey on bacteria increases, so that the proportion of energy that is dissipated increases and the amount of sludge generated is greatly reduced.

(5) The activated sludge method has a BOD of 50 to 6
When the amount is 0 mg / l or less, the aggregation of microorganisms does not proceed sufficiently, but with a biofilm, it is possible to do so even with wastewater with a low BOD, which is suitable for cleaning ponds.

(6) Phosphorus is introduced into cells RN under aerobic conditions
It is a biological phosphorus removal method that is excessively incorporated as A.

The present invention has been completed on the basis of the above new knowledge in order to solve the problems of the prior art. It can be easily installed in an existing pond, and the maintenance management after installation is technically and economically possible. It is an object of the present invention to provide a novel water purification system that can be advantageously performed.

[0015]

As means for solving the above problems, the water purification system according to the first invention is
An inlet for introducing pond water from the outer peripheral portion, and means for communicating with the inlet and ejecting the pond water above the water surface of the pond, and further introducing the fountain ejected by the means downward A purification structure body having a slide so that most of it sinks below the water surface, an indigenous bacterial unit moored below the water surface on the outer periphery of the purification structure body, and the indigenous bacteria And a biofilm tank unit moored at the outer periphery of the purification structure main body and at a plurality of places below the water surface of the outer periphery of the indigenous bacterial unit, which is formed by filling a filter cage that is a source of It is characterized by being done.

The water purification system according to the second aspect of the present invention has a suction port for introducing pond water from the outer peripheral portion and means for connecting the suction port to the pond water and ejecting the pond water above the water surface of the pond. A purifying structure main body installed at a substantially central position of the pond, a stirring means and an intrinsic bacteria unit provided under the water surface on the outer periphery of the purifying structure main body, and a filter medium which is a source of the intrinsic bacteria. A biofilm tank unit that is filled inside and is moored at a plurality of locations below the water surface on the outer periphery of the purification structure body and on the outer periphery of the indigenous bacterial unit;
It is characterized by being composed of.

[0017]

In the structure of the above-mentioned claim 1, the water ejected from the ejection means onto the water surface is guided by the introduction slide to uniformly distribute the biofilm in the process of falling into the gap between the purification structure body and the indigenous bacterial unit. It is purified by passing through the tank at a constant speed and is evenly dispersed.

At this time, the indigenous bacteria which are inactivated from the indigenous bacterial unit into the biofilm tank are activated and proliferated by the filter material of the biofilm tank to promote purification of water passing through the biofilm tank. At the same time, a part of it mixes with the water and diffuses outside, contributing to the purification of outside water.

Further, in the structure of claim 2, the water in the pond can be circulated by jetting the water from the jetting means onto the surface of the water, and at the same time, the water of the dissolved oxygen is added to the biofilm tank by the stirring means. Inherent bacteria induced in the biofilm tank in a deactivated state from the indigenous bacterial unit as it is sprayed and vigorously agitated are activated by the filter media of the biofilm so that the growth efficiency is increased. Let Therefore, while facilitating the purification of water passing through the biofilm tank, a part of the water is mixed with the water and diffused to the outside, thereby contributing to the purification of external water.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an embodiment of the present invention will be described below with reference to the drawings.

[0021]

[Embodiment 1] FIG. 1 is a plan view of a water purification system according to an embodiment of the present invention, and FIG. 2 is a longitudinal side view of the same water purification system.

As shown in the figure, this water purification system 1
Is a purification structure main body 3 arranged substantially in the center of the pond 2, an inlet 4 for communicating with the purification structure main body 3 to introduce water on the outer periphery, and moored in water around the structure main body 3. The biofilm tank unit 5 is mainly configured.

Specifically, as shown in FIG. 4, the purification structure main body 3 has a bottom plate 7 having a predetermined area which is placed substantially in the center of the platform 6, and a bottom plate 7 placed substantially in the center of the bottom plate 7. A can body 9 that is placed and connected to a water conduit 8, and a cylindrical float 11 that is connected to the upper part of the can body 9 through a cylindrical net 10.
An introduction slide 12 attached to the upper edge of the flow 11 and opening downward in an umbrella shape to the outer periphery of the can body 9; and a tapered surface 13 above the float 11, and
Hole 15 having the same diameter as that of the center hole 14 of the float 11
It is composed of a truncated conical cylinder 16 having the above and a jetting means 17 provided inside thereof.

The platform 6 is about 3.9m x 3.9m = 15.21m
^It consists of a flat plate with an area of ² (about 4 and a half), but a squid-like structure body can be adopted.

The bottom plate 7 is made of a flat flat plate, and the lower end edge of the introduction slide 12 extends horizontally more outward than the virtual intersecting portion which extends and descends, and has an area sufficient to guide the descending fountain horizontally outside. There is.

The jetting means 17, specifically, is placed in the center of the can body 9 and has a submersible pump 19 having a large number of suction holes 18 below, and from above the submersible pump 19 to the center hole 14 of the float 11. It is composed of an extending nozzle 20 and an air suction port 21 that communicates with the central hole 15 from the outer circumference of the truncated cone 16.

The purification structure body 3 is anchored to the platform 6 by an anchor 22 so that the upper part thereof slightly projects above the water surface.
Is moored.

The suction port 4 is mounted on the bottom portion 23 of the pond 2 so as to suck the water around it and feed it to the jetting means 17 through the water conduit 8. In FIG. 2, it is placed at two symmetrical positions with respect to the purification structure main body 3, but it may be placed at one place, or at least three places. .

The introduction slide 12 is adapted to uniformly guide and lower the fountain to a constant depth in the outer circumference of the water. Further, an indigenous bacteria supply cartridge 24 is unitized and installed on the outer periphery of the lower end thereof.

As a representative of indigenous bacteria, BSK bacteria (Bacillus
Subtilis Kubota) is often used. BSK bacteria are found in soil, belong to Bacillus subtilis, are Gram-positive bacteria having antagonistic activity against harmful bacteria such as spoilage bacteria, and are reducing bacteria, and are similar to standard Bacillus subtilis, The nature is different. Under the microscope, it was observed as a long chain when alone or in the double type. And, this BSK bacterium has already been applied for as a biologic, and at that time, it was deposited as Microtechnology Research Institute No. 9643.

BSK for biofilm system (biofilm tank unit)
BSK bacteria can be predominantly formed by adding bacteria at any time, and the advantages thereof are as follows.

(1) The processing speed for improving the transparency of pond water is faster than other biosystems (FIG. 8).

(2) The function of reducing nitrogen and phosphorus in the pond water is improved.

(3) Decomposition efficiency of organic matter is 2 of activated sludge method.
Double.

(4) The biodegradation of many pesticides can be accelerated.

(5) It can contribute to the odor control of the pond.

Further, the BSK bacterium itself can be stably grown by fixing on a specific microbial bed (for example, the filter medium of the examples).

As shown in FIG. 3, the biofilm tank unit 5 is a unit (group) of twelve biofilm tanks 25 moored along the edge of the bottom plate 7 on the outer periphery of the purification structure body 3.
And moored along the edge of the platform 6 16
It is composed of a unit (group) of individual biofilm tanks 25.

Each biofilm tank 25 moored in this way
Specifically, as shown in FIG. 4, the cylindrical net basket 26 is
A float 27 installed above the net basket 26, a filter material 28 filling the net basket 26, and the float 27 extending downward from the center of the net basket 26 from its lower end surface 29. The mooring rope 30 is exposed and connected to the platform 6.

As the filter medium 28, a contact agent called Bios (trade name) having a specific gravity of 0.9 is often used, but fibrous activated carbon felt (trade name ACF) is also used. In addition to various bacteria, algae, Daphnia, red worms, protozoa, and BSK bacteria, the filter medium 28 easily adheres.

Further, the biofilm tank unit 5 may be moored by suspending each biofilm tank 25 on the squid 31, as shown in FIGS. 5 to 7. In this case, the float is unnecessary as a constituent member of the biofilm tank 25, and conversely, a sink (not shown) may be used.

The squid 31 is manufactured by assembling the pipes of a certain standard with the pipe 32, but the squid 31 is assembled to be connected at the site so that workability and maintainability can be facilitated.
Further, since it is not directly connected to the central purification structure body 3, partial replacement maintenance is easy.

Next, the operation of the embodiment constructed as described above will be described.

The water in the pond 2 sucked in through the suction port 4 is introduced into the purifying structure main body 3 through the water conduit 8 and the submersible pump 1
Each of the biofilm tanks 25 is unitized by being sprayed into the air above the water surface by the spraying means 17 including the nozzles 20 and the like, being aerated well, descending along the introduction slide 12, and colliding with the bottom plate 7. Is evenly guided. At that time, a part of the guided water passes through the united indigenous bacteria supply cartridge 24 and passes through the biofilm tank 25 at a constant speed.

Some of the inactivated BSK bacteria in the indigenous bacteria supply cartridge 24 are activated and proliferated on the spot by satisfying conditions such as oxygen due to aeration, nutrient sources mixed with guided water, and temperature. Then, it is guided to and attached to each biofilm tank 25. In addition, some other inactivated BSK bacteria are directly guided to and attached to each biofilm tank 25, where the conditions such as oxygen, nutrients, and temperature are fulfilled, activated, and proliferated. .

The water passing through each biofilm tank 25 is
Therefore, the activated and proliferating BSK bacteria are mixed and uniformly diffused to the outside. The diffused BSK bacteria decompose by decomposing organic substances mixed in outside water, biodegrading pesticides, and reducing nitrogen and phosphorus to purify them.

The water thus decomposed and purified is further
The purifying structure main body 3 and the ejection means 1 are sucked from the suction port 4.
The circulation is repeated to 7, and the same treatment with BSK bacteria is carried out for further purification.

When the purification power of the pond water declines,
B by replacing the indigenous bacteria supply cartridge 24
Reinforces SK bacteria and sustains purification action.

[0049]

Second Embodiment Next, FIGS. 10 and 11 show another embodiment of the water purification system 1 according to the present invention. The water purification system 1 is a purification structure arranged substantially in the center of a pond 2. The object main body 3, the agitating means 35, 35 provided in water around the structure main body 3, the indigenous bacteria unit 24, and the biofilm tank unit 5 are mainly configured.

The purifying structure main body 3 is provided with a jetting means 17 at a central portion between a top plate 36 and a bottom plate 37 having a predetermined area, and agitating means 35, 35 on both sides of the jetting means 17.
Is provided. Further, the floats 11 and 11 are provided on the outer side of the back surface of the top plate 36, and the indigenous bacteria unit 24 is provided on the outer periphery of the lower portion of the ejection means 17.

The jetting means 17 is composed of a horizontal pump 19 and a nozzle 20 provided at the center of the upper part of the submersible pump 19. The tip of the nozzle 20 is projected above the water surface.

Next, the stirring means 35, 35 are the submersible pump 3
8 and 38, nozzles 39 and 39 provided vertically on the submersible pumps 38 and 38, and nozzles 40 and 40 provided horizontally on the side. The nozzles 39, 39 are projected from the surface of the water, and the nozzles 40, 40 face the biofilm tank unit 5 moored in water on the outer periphery of the indigenous bacteria unit 24.

Next, the operation of the embodiment having the above-mentioned structure will be explained. The water in the pond sucked from the suction port 4 is introduced into the purification structure main body 3 from the water pipe 8, and the submersible pump 19, the nozzle 20, etc. It is jetted onto the surface of the water by the jetting means 17 and is well aerated and falls, so that the water in the pond 2 is circulated.
Moreover, the biofilm tank unit 5 is provided by the stirring means 35, 35.
As the dissolved oxygen water is sprayed and strongly agitated, the indigenous bacteria introduced into the biofilm tank in a deactivated state from the indigenous bacterial unit 24 are dissolved oxygen in the water and coexist. When the conditions such as the nutrient source and the temperature are satisfied, the filter medium 28 of the biofilm tank unit 5 is activated and proliferates at a remarkable speed.

The water passing through each biofilm tank 25 is
It is activated and proliferated there. Purifies by decomposing organic substances mixed with BSK bacteria, biodegrading pesticides, and reducing nitrogen and phosphorus. The water purified in this way is further circulated to the jetting means 17 and the stirring means 35,
It will be further purified.

In this embodiment, FIGS. 1 to 9 are used.
The same reference numerals denote the same parts, and the description thereof will be omitted.

[0056]

As described above, according to the present invention of claim 1, since the water purification system is constructed by combining the biological membrane tank with the main body of the purification structure with the circulating water suction port installed in the pond, Exert the effect of.

(1) Nitrogen and phosphorus in the pond can be efficiently reduced by biological treatment (FIGS. 8 and 9).

(2) In particular, since construction works such as civil engineering work and special pits are not required, the facility cost can be reduced.

(3) The state of the biofilm responds to changes in the water quality of the pond water, and sludge accumulated on the biofilm and the like also becomes exfoliated sludge that is automatically dropped and removed to the ground floor, which is excellent in maintainability. There is.

(4) Since the pond water is repeatedly purified by circulation, a large amount of water quality can be purified only by using dissolved oxygen by the aeration effect of the fountain in a small facility. It can be small.

(5) By forming an anaerobic part in a part of the biofilm, it can be useful for activation of denitrifying bacteria, and can further promote the reduction of nitrogen.

(6) When the intake port for pond water is provided deeply,
It is useful for destroying the water temperature separation layer in summer, eliminating anaerobes in the deep layer, and reducing biological production due to the high temperature of surface water.

(7) Depending on conditions such as pond area, water capacity, and water depth, it is possible to make a design corresponding to each.

(8) Since most of the purification structure body and the biofilm tank unit are moored under the surface of the water, the landscape of the surface of the water is not impaired and only a small electric installation box is required for the land portion.

(9) In order to maintain the balance of various elements required for the activity of the indigenous bacteria, the speed of water depth purification can be promoted by artificially supplying the carbon source required as an energy source.

(10) The floating platform can automatically respond to changes in water level and can maintain a certain landscape.

Further, in addition to the same effects as the above-mentioned claim 1, the invention of claim 2 can satisfactorily circulate the water in the whole pond by providing the stirring means, and can also dissolve the water of dissolved oxygen in the biofilm tank. By spraying with, it is possible to measure the activation of indigenous bacteria induced in the biofilm tank in a deactivated state and increase the efficiency of growth.

[Brief description of drawings]

FIG. 1 is a plan view of a water purification system according to the present invention.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is an enlarged plan view of an essential part of the above water purification system.

FIG. 4 is an enlarged vertical cross-sectional view of the main part of the above water purification system.

FIG. 5 is a vertical cross-sectional view of a modified example of the above water purification system.

FIG. 6 is a plan view of a modification example of the above.

FIG. 7 is an enlarged perspective view of a main part of the above modification.

FIG. 8 is a graph showing the relationship between the transparency and the elapsed time when the transparency change in the circulation in the biofilm tank by BSK bacteria is compared with other bacteria.

FIG. 9 is a graph showing the relationship between the amount of treated water and the improvement in investment when the water purification system and the conventional reactor system are compared.

FIG. 10 is a plan view showing another embodiment of the water purification system.

11 is a side view of the main part of FIG.

[Explanation of symbols]

 1 Water purification system 2 Pond 3 Purification structure main body 4 Intake port 5 Biofilm tank unit 24 Inherent bacterial unit (cartridge)

Claims (2)

[Claims] 1. A suction port for introducing pond water from an outer peripheral portion, and means for communicating with the suction port and for spouting the pond water above the water surface of the pond, further comprising a fountain jetted by the means. A main body of the purification structure installed at a substantially central position of the pond so that most of it has a slide that guides and introduces it below the water surface,
An indigenous bacterial unit moored below the water surface of the outer periphery of the purification structure body and a filter medium that is a source of the indigenous bacteria are filled in a net basket, and the outer periphery of the purification structure body and the indigenous A water purification system comprising: a biofilm tank unit moored at a plurality of places below the water surface on the outer periphery of the bacteria unit. 2. A suction port for introducing pond water from an outer peripheral portion, and means for connecting to the suction port and ejecting the pond water above the water surface of the pond, and are installed at a substantially central position of the pond. The purification structure main body, a stirring means and an intrinsic bacteria unit provided below the water surface on the outer periphery of the purification structure main body, and a filter medium that is a source of the intrinsic bacteria are filled in a net basket, A water purification system comprising: a biofilm tank unit moored at a plurality of locations below the water surface on the outer periphery of the main body and on the outer periphery of the indigenous bacteria unit.