JPH0775708B2 - Submersible sewage purification method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for purifying wastewater such as pond water and an apparatus therefor.

(Prior Art) Fertilizers and pesticides for turf growth flow into the pond water of a golf course due to rainwater, and wastewater from clubhouses is discharged and polluted. Discharging this water as it is pollutes the river. Therefore, it is necessary to install a sewage treatment device. The device is usually installed on the ground, and a method is used in which it is sent from a waste water tank to a device outside the pond by a suction pipe, and the water treated there is sent back by a drain pipe.

This conventional device requires sedimentation in a sedimentation tank before drainage, and this sedimentation waste increases according to the amount of wastewater treated, and it is essential for maintenance to remove it regularly. .

In addition, since the pond water actually becomes a sewage pond, it was always polluted and had an offensive odor.

In addition, a device such as a waste water tank provided on the ground often spoils the landscape, and consideration may be given to hiding trees by planting trees around them.

There is also a vertical purification method in which a case having buoyancy is floated to create a vertical water flow in the case, and sewage is biologically purified and discharged in the process of the flow.

Although this method can be expected to partially purify the vicinity of the device, it does not positively generate a horizontal water flow, so that the entire large pond water cannot be efficiently and thoroughly purified. In addition, if the installation location of the device is shallow, there is a problem that the water may become muddy by flying up to the sludge that has settled to the bottom.

(Problems to be Solved by the Invention) The present invention has been made in view of such conventional circumstances,
A method and apparatus for purifying sewage that keeps pond water constantly treated by submerging the entire apparatus, does not require periodical sediment removal work, and does not impair the landscape on the ground. Is.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention submerges and fixes a submerged-type sewage purification device equipped with a water flow generating means for purifying sewage by microorganisms, By continuously inhaling sewage from one side of the sewage purification device by the water flow generation means to purify the sewage and discharging the purified water from the other side, a stirring water flow that circulates horizontally in a certain direction is generated, and This is a method of purifying the entire range that the stirring water flow reaches.

Further, a water inlet is provided on one side of the case to be submerged in water, a drain port is provided on the other side, and a filter is attached to the water inlet.
An apparatus for carrying out the above method, which comprises a water flow generator, a sewage purification device using a microorganism adhering material, and a bubble generator for supplying oxygen to the microorganism adhering material in this case.

(Example) The Example of this invention is described based on drawing.

<Method> FIG. 1A shows a pond in which sewage is collected, and shows a state in which two submerged sewage purification devices are installed in the circulating water flow direction. In FIG. 2B, 1 is a case in which a water flow generator 5 and a sewage purification device 6 are incorporated, which is submerged in water as shown in FIG. If it is submerged, it may be in the middle or completely submerged in the pond.

Now, in this water, the water flow generator 5 sucks the sewage F into the case 1 from one side, and the sewage F is microbially treated by the sewage purification device 6 filled with the microorganism adhesion material 7 to purify the water. The purified water G is discharged from the other side to the outside of the case 1.

In this way, the entire water treatment is carried out in water, and a horizontal circulating water flow E of a fixed direction is made in every corner of the whole pond water to stir the whole pond water to constantly purify the whole pond water. The generation of the circulating water flow is weak at a position far away from, and in that case, as shown in FIG. 1, an appropriate number of submerged sewage purification devices are installed in a fixed horizontal direction along the flow. Then, a circulating purified water flow in a certain direction is generated to every corner of the pond water.

<Device> As shown in FIGS. 2 to 4, the entire device forms a capsule-shaped case. The size can be made according to the depth and breadth of the pond to be installed, but the size shown in the figure is about 5
m, width about 2m, height 0.7m.

The case 1 is provided with a water suction port 2 on one side and a drainage port 3 on the other side, a filter 4 is attached to the water suction port 2, and a water flow generator 5 of a screw is provided on the discharge port 3.

Although the position of this screw is the drainage port 3 in the figure, it is also possible at the side of the water intake port 2 or at an intermediate position because it creates a constant flow in the sewage purification device 6 described later.

In order to adjust the flow of the water, the outside of the case is covered with a mesh filter 13 for preventing dust intrusion to provide a damper 14 for adjusting the water flow. Further, the inside close to the water inlet 2 and the outlet 3 are provided. A rectifying device 15 is provided in the vicinity of the inside.

Further, the filter 4 has a streamlined shape toward the outside so as not to be blocked by inhalation or catching of large dust. This prevents the biomodule 7 and the screw 5 described later from being destroyed.

In addition, a sewage purification device 6 using microorganisms is provided in the case 1.

This sewage purification device 6 is filled with biomodules (trade name of Civil Engineering Research Center) as a microbial adhering material 7 at a uniform density in an aggregated state. This biomodule is a special structure for growing microorganisms, and has a shape in which fibers of a predetermined length are planted in a string. Many kinds of microorganisms adhere to and grow on this, and microorganisms suitable for the sewage environment propagate.
And the excess sludge treated by the self-digestion of this microorganism is extremely small. Even if a little excess sludge comes out, it is discharged by the flow, so that the sludge hardly stays in the device. For this reason, it is not necessary to perform the regular work of removing the settled dirt as in the conventional case.

Further, a bubble generator 8 is provided in the middle stream of the biomodule. This bubble generator 8 floats the intake port 9 on the water and connects it to the air pump 11 with a flexible air pipe 10.
Air is always sent to the bubble port 12 arranged at the bottom to constantly generate bubbles. The generated bubbles are discharged to the surface of the water through the gaps of the damper 14 or the like, but can be discharged by providing a discharge port in the upper part of the case 1.

Further, a leg 16 whose length can be adjusted is provided at the bottom of the case 1 so that it can be sunk at a set height from the bottom of the pond.

A float chamber can be provided inside the case 1 or a floating bag can be attached to the outside to float in the water. In this case, it can be towed by connecting to a ship on a river or sea.

Since there is a possibility that the upper part of the device will appear above the water due to an abnormal drop in the water surface, a mode in which a decorative shaped object such as rock is attached to the outer surface of the upper part of the case 1 for camouflage is possible.

(Test Example) The effect of the following comparative experiment was simulated and examined.

As shown in the flow chart of FIG.
They were classified into types and the degree of purification was examined under the same conditions.

A: Untreated raw water is overflowed.

B: Air is blown with a blower to generate bubbles and agitate.

C: Sends air with a blower and allows raw water to permeate the microbial adherent. This is the simulation device of the present invention.

Raw water is collected from the algae and other algae generated in the actual golf course pond and filtered through a 1 μm filter.
Send to B and C.

Test period September 1 start Water temperature 20 ° C October 2 Change water temperature Water temperature 30 ° C October 30 End Analysis item and measurement method Analysis item: Measurement method PH: JIS-K-0102-12-1 SS: JIS -K-0102-14-1 COD: JIS-K-0102-17 BOD: JIS-K-0102-21 T-N: JIS-K-0102-45 T-P: JIS-K-0102-46 Fe: JIS-K-0102-57-2 D0: JIS-K-1002-32-1 Chromaticity: Appendices 6-1 of the Ministry of Health and Welfare Ordinance 56 6-1 Permeability: JIS-K-0102-9 Since it takes a long time, the test was started after the seed sludge was attached in advance.

The test results are shown in Tables 1 and 2 below.

Table 1 shows the difference in BOD (Biological Oxygen Demand) values when the water temperature is 20 ° C assuming spring and autumn seasons.

At the BOD value of 25 September, in the case of A, 13.8 mg / l, B was 9.3 mg / l, and C was 2.5 mg / l, and the purification of C was remarkable. This shows the biological treatment effect of the microbial adherent. Almost no generation of SS (suspended substance) was observed.

Table 2 shows the case where the water temperature is 30 ° C assuming summer.
The test in Table 1 was continued. And on October 8th, BOD was 12.3 mg / l for A and B was 11.0 mg / l
C is 2.7 mg / l, which is the same as the result of September 25 above.
Is remarkable, which also shows the biological treatment effect of the microbial adhering material.

Regarding SS (suspended substance), A and B increased in sequence from October 8 to October 25, due to the propagation of planktonic algae such as planktonic cyanobacteria and diatoms. However, the value of C was low. This is because the filamentous algae such as red-green algae that adhere to the microorganism-adhering material propagate, but few algae that float in water. The presence of these algae was confirmed under a microscope.

Further, when the transparency was measured on October 14, the case of A was 60 degrees and the C was 90 degrees, showing a remarkable improvement. This is due to the difference in the abundance of algae floating in water indicated by the SS value above. Even in the chromaticity measured on October 5, A had a yellowish tint at 52 degrees and Supports breeding.

Furthermore, for C, which is the simulation device of the present invention, the BO
It was confirmed that in any of the test items other than D, SS, transparency, and chromaticity, the purification effect was superior to other test items.

As described above, C, which is the simulation device of the present invention, can be confirmed to have a great effect particularly in BOD as compared with the other methods A and B. This is because purification is performed by flowing sewage and allowing it to permeate the microorganism-adhering material. It is shown to be effective, and since B is more effective than A in the case of sending air by a blower, it can be interpreted that the effect is enhanced by sending air (oxygen) and stirring.

[Operation and Effect of the Invention] The present invention is as described above, and almost all of the device is submerged in the pond water, and the agitation water flow is continuously maintained for a long period of time in the horizontal direction by the submersion-type sewage purification device to generate pond water. A horizontal circulating water flow is generated, and in the equipment, organic substances that are the source of pollution are decomposed by microorganisms, and the water purified by the submersion type wastewater purification device rides on the circulating water flow and diffuses extensively and mixes with the surrounding wastewater. As a result, the entire pond water can be constantly maintained in a purified state, and an offensive odor and floating algae can be prevented from occurring.

The device is filled with microbial adhering material in a uniform density in an aggregated state, and a bubble generating device is installed upstream or midstream of this microbial adhering material. Since the amount of water can be passed through the inside of the apparatus, the ability of decomposing microorganisms is efficiently increased, and almost no precipitate is generated. Therefore, the work of removing the precipitate is not required, and maintenance after installation is easy. In addition, since the filter does not allow dust to enter the case, the internal device is not destroyed, and the trouble required for maintenance of the device is almost unnecessary. In other words, the function can be maintained for a long period of time while being buried.

Moreover, since the installation is completed simply by transporting the device completed in the factory to the destination and immersing it in the water, it is not necessary to install equipment, which requires a long construction period as in the past.

Furthermore, most of the equipment is below the surface of the water so that the landscape on the ground is not compromised.

Therefore, the present device can be used not only in golf courses but also in polluted lakes, ponds, dams, rivers, and seas, and it greatly contributes to improving the quality of sewage water and preventing pollution.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a conceptual diagram.
Fig. 2 is a schematic plan view of a pond, (b) is a partially enlarged vertical side view of the same as above, Fig. 2 is a perspective view of the whole apparatus, Fig. 3 is a cross sectional plan view of the same as above, Fig. 4 is a side view of the same above, and Fig. 5 is a test example. Flow chart. 1 ... Case, 2 ... Water inlet, 3 ... Drainage port, 4 ... Filter, 5 ... Water flow generator, 6 ... Sewage purification device,
7 ... Microorganism adhering material, 8 ... Bubble generator, 9 ... Intake port, 10 ... Air pipe, 11 ... Air pump, 12 ... Bubble port, 13 ... Net filter, 14 ... Damper, 15 …… Rectifier, 16 …… Legs, A …… Pond water, B …… Water surface, C …… Pond bottom, D …… shore, E …… Water flow, F …… Dirt water, G …… Purified water.

Claims (7)

[Claims] 1. A submersible type sewage purification apparatus equipped with a water flow generating means for purifying sewage by microorganisms is submerged and fixed in position, and sewage is sucked from one side of the sewage purification apparatus by the water flow generating means to purify sewage. Then, by continuously discharging the purified water from the other side, a stirring water flow that circulates horizontally in a fixed direction is generated, and the entire range reached by the stirring water flow is purified. 2. A submerged case is provided with a water intake port in the front and a drainage port in the rear, a filter is attached to the water intake port, and a water flow generator and a sewage purification device using a microorganism adhering material are provided in the case. A submersible sewage treatment apparatus comprising: and a bubble generator that supplies oxygen to the microorganism-adhering material. 3. The submersible sewage purification device according to claim 2, wherein the water flow generator is a screw. 4. The submersible sewage treatment apparatus according to claim 2, wherein a damper for adjusting the water flow is provided on the wall surface of the case. 5. The submersible sewage treatment apparatus according to claim 2, wherein the shape of the water inlet is a streamlined filter toward the outside. 6. The submersible sewage treatment apparatus according to claim 2, wherein a rectifying device is provided in the vicinity of the water intake port. 7. The submersible sewage treatment apparatus according to claim 2, wherein a rectifying device is provided in the vicinity of the discharge port.