JPS63252596A - Waste water treatment apparatus - Google Patents

Abstract

PURPOSE:To efficiently treat waste water, by dividing the interior of a container into upper and lower parts and constituting the upper part as an algae part where adhesive filamentous algae proliferate while constituting the lower part as a heterotrophic part where a heterotroph proliferates and allowing both parts to communicate with each other by a communication passage to form an endless flow passage where a water recirculation apparatus is arranged. CONSTITUTION:When air is introduced through an air diffusion pipe under pressure, a mixture of waste water and microbes is recirculated through an endless flow passage in the direction shown by an arrow. During the day, the adhesive filamentous algae (f) adhered to the upper adhesive surface (f) of an algae part (a) absorb sun rays to perform photosynthesis and, at the same time, absorb oxygen supplied by the air introduced under pressure, re-aeration and photosynthesis to proliferate. As a result, BOD, N and P in the waste water are removed to purify the waste water. In a heterotrophic part (h), aerobic bacteria absorb the residual oxygen from the algae part (a) to proliferate and BOD, N and P are similarly removed to purify the waste water. During the night, aerobic bacteria and adhesive filamentous algae (f) proliferate by oxygen supplied by the air introduced under pressure and re-aeration to purify the waste water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for the biological treatment of right-handed wastewater.

Conventionally, typical wastewater treatment methods using algae require high-rate oxidation methods. The high rate oxidation method is based on the coexistence of planktonic FJ species and aerobic bacteria, in which aerobic bacteria decompose and fix BOD sources using oxygen released as a result of photosynthesis of planktonic algae, and algae \.

It is necessary because it purifies wastewater by fixing P.

Treatment using algae, as typified by the high-rate oxidation method, has the advantages of being able to remove N and P, being energy-saving, and allowing the grown algae to be reused as feed and fertilizer. ) It is necessary to make the pond shallow in order to allow planktonic algae to predominately proliferate, resulting in a large site area and difficulty in stirring; (a) Planktonic algae are difficult to settle and are (1) Planktonic algae are easily preyed on by rotifers, daphnia, etc., and may disappear within a few days, resulting in a lack of stability. Because they are slow compared to aerobic bacteria and are planktonic in the treated water and runoff, in order to maintain the required algae concentrations and achieve treatment goals,
Treatment residence time needs to be longer than other treatment methods;
There are drawbacks such as.

The present invention was made in view of these problems,
The purpose of the present invention is to provide an inexpensive wastewater treatment device that uses sessile filamentous algae as type III and has an efficient and stable treatment capacity.

That is, the present invention provides an apparatus for biologically treating wastewater, the apparatus comprising: (a) a light source formed in a container for treating wastewater filled with a mixture of wastewater and microorganisms; (b) an algae section provided with an attachment surface that is irradiated with irradiation and allows adherent filamentous algae to adhere and proliferate; (c) a flow path communicating the algae section and the dependent section, and (d) a water circulation device for circulating wastewater through the algae section and the dependent section; and (d) a water circulation device. The interior was divided into upper and lower parts by partition walls, the upper part was configured as a navigational algae part that was irradiated with natural light, and the lower part was configured as the dependent part, and this algae part and the dependent part were connected by the communication channel. Waste water configured as one endless flow path, and characterized in that the water circulation device for starting a circulating flow of water along the endless flow path is provided within the communication flow path or above the communication flow path. This treatment device is capable of predominantly propagating adherent filamentous algae, and the action of the adherent filamentous algae can be used to efficiently purify septic wastewater.

Next, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is a longitudinal sectional view taken along the line AA in FIG. 1.

The processing tank 1, which has a large planar area, is partitioned into upper and lower sections by a partition wall 2, and the upper and lower sides are communicated with each other by communication channels C1 and C2 at both ends of the processing tank 1, so that the processing tank 1 is configured as one endless channel. An attachment surface t is formed on the upper surface of the partition wall 2, and the adherent filamentous algae f is allowed to adhere and grow on this surface. Thereby, the upper part of the partition wall 2 is the algae part a, and the lower part is the dependent part. The communication channel C1 opens at the bottom of the algae section a and extends vertically downward.
After reaching below the bottom surface of the processing tank 1, it is bent, extends vertically downward, and has a dependent portion opening at the bottom surface. The communication channel C2 is
The partition wall 2 is formed by being provided a little apart from the side chamber of the processing tank 1. A screen 4 for collecting detached adherent filamentous algae is provided in the communication channel C2. The partition wall 2 is provided low and slightly inclined toward the communication channel C2 side. A foam stopper 7 is provided at the inlet of the algae section a across the waterway.

A ventilation pipe 3 for starting a circulating flow of water is opened below one vertically installed side of the communication channel C1, and an aeration pipe 5 is provided in this opening, thereby forming a water circulation device. . A flow control valve 6 is provided in the ventilation pipe 3, and constitutes a flow rate conversion mechanism for the circulating flow.

When a gas such as air is pressurized through the aeration pipe 5, an upward flow is generated in the gas-liquid mixing system due to the air lift effect, and as a result, a circulating flow is formed in the direction of the arrow in the endless flow path. Oxygen, carbon dioxide, etc. in the gas are dissolved and supplied to the mixed liquid, and used for the growth of aerobic bacteria and adherent filamentous algae,
Purification is promoted.

Due to the operation of the water circulation device, the water surface slopes low in the direction of flow, so if the partition wall 2 is installed parallel to the still water surface, the water depth of the algae section a will be greater upstream and smaller downstream, and the algae will adhere to the water. The light m reaching the filamentous algae f becomes uneven,
This causes the inconvenience that the flow velocity becomes non-uniform. This problem can be solved by sloping the partition wall 2 low in the direction of flow. Bulkhead 2
The slope may be about 0.05 to 0.1%.

Another embodiment of the water circulation device is shown in FIGS. 3 and 4.

In FIG. 3, an axial flow pump consisting of an impeller 8, a motor 9, and a casing 10 is provided above the communication channel C1 to constitute a water circulation device. A vent pipe 3 opens below the impeller 8. The gas injected from this
Due to the shearing force of the water flow produced by the impeller 8, the bubbles are formed into fine bubbles, which move together with the liquid mixture within the communication channel C1, and are finally released from the water surface above the communication channel C1.

In FIG. 4, an underwater aerator 11 is provided below one vertical portion of the communication channel C1 to constitute a water circulation device. Since the underwater aerator 11 has a built-in motor, it has the effect of keeping and raising the temperature of the mixed liquid, and has a favorable effect on purification.

In the embodiments shown in FIGS. 2, 3, and 4, the communication channel C1 is extended downward, so the contact time between the pressurized gas and the mixed liquid is long, and oxygen, carbon dioxide, etc. High dissolution efficiency. Furthermore, in FIGS. 2 and 4, since the water depth at the gas injection site is large, the circulating flow rate of the mixed liquid obtained per unit power output is large. The water depth at the gas injection site is preferably 1 m or more.

Next, the operation will be explained using an actual example h1 shown in FIG.

When air is forced into the air diffuser 5@, the mixture of wastewater and microorganisms circulates in the endless flow path, as described above.

During the day, in the algae section a, the adherent filamentous algae f growing on the adhesion surface of the upper surface of the partition wall 2 absorb sunlight and perform photosynthesis, while at the same time absorbing the air injected through the aeration pipe 5. They absorb and respire by absorbing the dissolved and supplied substances from the water surface, the oxygen dissolved and supplied from the water surface by reaeration, and the oxygen generated as a result of photosynthesis. Mainly as a result of this multiplication, BOD sources, N, and P in the wastewater are removed from the wastewater, resulting in purification. In addition, in the dependent part, aerobic tIIl bacteria absorb the oxygen remaining as a result of the generation and consumption of oxygen in the algae part a and proliferate. This also similarly removes BOD sources, N, P, etc., and purifies the wastewater.

Here, since aerobic bacteria are planktonic, the places where they proliferate are not limited to the dependent parts, but proliferate everywhere as they circulate in the endless channel together with the wastewater. Carbon dioxide gas generated by respiration of aerobic bacteria is absorbed by the sessile filamentous algae f in the algae section a, and promotes oxygen generation and proliferation of the sessile filamentous algae f.

At night, aerobic bacteria, adherent filamentous algae, etc. proliferate by absorbing oxygen dissolved and supplied from the air injected through the aeration pipe 5 and oxygen dissolved and supplied from the water surface by reaeration. , wastewater is purified. Even at night, by irradiating with artificial light, wastewater can be purified in the same way as in the daytime.

The operation of the device, that is, the operation of the water circulation device and the blower (not shown), can be carried out in three ways: daytime, nighttime, or daytime and nighttime; however, in the present invention, since the action of adherent filamentous algae f is mainly utilized, It is preferable to drive only during the day or night.

The adherent filamentous algae f used in the present invention refers to algae among freshwater green algae that form a single filament and grow attached to other objects using appressoria, and the following algae are particularly effective. i.e. Phormidium II HOrffiiidiUI
II-5p.

Stigeoclonium gIStigeoclonium
sp.

1:l: t:' Ulotrix
sp.

Oedogonium Sp
.

Aomidoro Q Spirogyra Sp
; Draparnaldia
Sp.

The above-mentioned algae attach to other objects using appressoria called phlegms and grow as a filamentous ring system. This ring system is intertwined with each other to form a bundle. This ring system bundle overlaps each other in the vertical direction, forms a layer several centimeters thick over the entire upper surface of the partition wall 2, and extends several meters in length in the flow direction. The space between these ring systems provides a perfect home for microscopic animals such as rotifers and daphnia. Microscopic animals such as rotifers and daphnia often prey on planktonic algae.
The concentration of planktonic algae is maintained appropriately, thereby preventing coloration of the mixture, improving light transmission, and favoring the preferential growth of sessile filamentous algae f. Furthermore, the ring system bundle and the space between the ring systems serve as a so-called fixed bed, which is a habitat for aerobic bacteria, and has an advantageous effect on purification.

The salt stopper 7 prevents the bubbles from migrating to the water surface of the algae section a, scattering and reflecting light from the bubbles, and reducing the amount of light irradiated to the adherent filamentous algae f.

Thereby, the irradiated light can be effectively used for proliferation.

The grown attached filamentous algae f can be captured by the screen 4 provided in the communication channel C2 and easily harvested.

This harvest can be reused as feed, fertilizer, etc. The screen 4 may have an opening of about 10 to 30 mm. Usually algae part a
The average flow velocity may be about 20 to 300 m/sec.

If operation is continued at this flow rate, the ring system bundle, which has multiplied and reached several meters in length, will break off one after another and flow to the screen 4.
Since it is captured and accumulated here, it is only necessary to collect it periodically. If the cyclic flux accumulates on the screen 4, it will obstruct the circulation flow, so in order to prevent this, it is necessary to
Also, the area of the screen 4 may be increased so that a detour flow path for water can be formed. As a result, algae part a
In this case, the flow is always uniform and no dead area is formed.

In another harvesting method, the flow control valve 6 is further opened,
If the gas flow rate is increased and the flow velocity is temporarily increased to 30 to 400 m/sec or more, the ring system bundle will increase by 30 to 50 cm from the attached part.
It is cut off in the middle leaving m, carried by the flow, and captured by the screen 4. In this way, by using the flow rate conversion aperture structure, the adhesion m of the adherent filamentous algae f can be arbitrarily controlled, and at the same time, the collection can be carried out at a fixed time.

The structure for converting the flow rate may be a structure for controlling the rotational speed of the motor used in the water circulation device, or a structure for controlling the number of water circulation devices, and can be easily constructed by those skilled in the art.

In any case, in the high-rate oxidation method using planktonic algae, a sedimentation tank, a flocculant, a centrifuge, etc. are required for the separation and recovery of planktonic algae, whereas in the present invention, Adhesive filamentous algae f can be easily separated and collected using a coarse screen, and has good ventilation, so it can be easily dried.
The cost of reusing it as feed and fertilizer is low.

In addition, in the high rate oxidation method using floating Pa,
The water depth needs to be 60 cm or less in order to allow light to penetrate to the ground, thereby keeping the pond in an aerobic state and allowing floating algae to dominate. For this reason, the water temperature is easily affected by the outside temperature, making it difficult to apply the high rate oxidation algorithm in cold regions. In the present invention, the treatment I'!
! The inside of the tank 1 is divided into upper and lower parts by the partition wall 2, and the adherent filamentous algae f is grown on the upper part of the partition wall 2, so if the water depth of the algae section a is set appropriately, the total water depth of the treatment tank 1 can be set arbitrarily. Furthermore, when water is not circulated at night, convection within the treatment tank 1 is hindered by the presence of the partition wall 2, making it difficult to cool down and making the water cloudy due to heat retention, allowing for efficient purification even in cold regions.

FIG. 5 is a longitudinal sectional view showing another embodiment of the device of the present invention. This example is a case of a deep processing tank where there is no need to extend the communication channel C1 downward from the bottom of the processing tank 1, and the partition wall 2 is provided slightly below the water surface, and an adhesion surface is formed on the upper surface of the partition wall 2. The sessile filamentous algae f adheres to and grows on this. In this case, since the adhesion area of the adherent filamentous algae f is small compared to the tank volume, the effect of the adherent filamentous algae f is small. However, if the treated water storage tank is configured as in this embodiment, additional removal of N and P can be expected with simple modification.

If it is desired to maximize the purification effect of the adherent filamentous algae f and increase its yield, it goes without saying that the area of the facility should be increased and the water depth should be reduced in view of construction costs. In such a case, as in the embodiment shown in FIGS. 2 and 4, by extending the communication channel C1 downward from the bottom of the processing tank 1 and sending air from below, the
While the inside can be stirred, the efficiency of supplying oxygen, carbon dioxide, etc. is also increased. Also in the embodiment shown in FIG. 3, the injected gas such as air is atomized by the impeller 6 and moves through the communication channel C1 for a sufficient amount of time, so that oxygen,
The supply efficiency of carbon dioxide gas, etc. increases.

The gas to be injected may normally be air, but if the adhesive filamentous algae f
It is effective to use carbon dioxide gas-enriched air if you want to increase the number of harvest ports, or if the main purpose is to remove N and P from wastewater with a low BOD, that is, to perform tertiary treatment.

In all of the above-mentioned embodiments, all have the function of venting rli gas or carbon dioxide gas, but this is not an essential condition of the present invention, and the structure may be configured as shown in FIG. 6th
The figures are longitudinal sectional views showing another embodiment of the invention. In this embodiment, an elongated treatment 491 is divided into upper and lower parts by a partition wall 2, and the upper and lower parts are communicated by communication channels C1 and C2 provided at both ends of the partition wall 2, and the communication channel C1 includes a motor 9, a casing 10, and an impeller 8. An axial flow pump consisting of the bulkhead 2 is provided.
An attachment surface t is formed on the upper surface, and the adherent filamentous algae f adheres to and grows on this surface. The communication flow path C1 does not extend downward from the bottom of a1, and does not have a ventilation function for oxygen or carbon dioxide gas.In this example, purification is performed mainly during light irradiation, as in a normal high-rate oxidation pond. In other words, during the day, in the algal zone a, the adherent filamentous algae f growing on the attachment surface t absorb sunlight and carry out photosynthesis, and at the same time absorb dissolved oxygen and They absorb oxygen generated as a result of photosynthesis, perform respiration, and multiply. Mainly as a result of this proliferation, BOD sources, N, and P in the wastewater are removed from the wastewater, resulting in purification.
In the dependent part t], aerobic bacteria absorb the oxygen remaining as a result of the generation and consumption of oxygen in the algae part a and multiply. This also similarly removes BOD sources, N, P, etc., and purifies the wastewater. Compared to the other embodiments, this embodiment has a simpler l, so the construction cost is lower, and since ventilation is not provided, the power cost is also lower.

FIG. 7 is a longitudinal sectional view C showing another embodiment of the device of the present invention. The dependent portion is divided into three parts by the partition wall 12 and the σ partition wall 13, and each part is communicated with each other to form one endless flow path. The flow area of each of these three sections is the algae section a.
The flow area of the flow path is approximately the same as or smaller than the flow area of the flow path. Therefore, a substantially equal flow rate is maintained within the flow path, making it possible to increase the capacity of the dependent part [), and at the same time, preventing the deposition of solid matter such as SS and bacterial cells in the dependent part.

In addition, if the raw wastewater has high turbidity or chromaticity and low transparency, Honjitsu/Iiii! By configuring as in the example,
The water depth of the algae section a can be appropriately set to be shallow.

FIG. 8 is a longitudinal cross-sectional view showing another embodiment of the device of the present invention. In order to uniformly cover the flow velocity in the endless flow path, the lower part of the endless flow path is divided equally by partition walls 2. An attachment surface t on which adherent filamentous algae adheres is provided above and parallel to the partition wall 2. The adhesion surface t may be configured like the upper surface of the partition wall 2 described above, or may have a net shape. In FIG. 8, the attachment surface t is configured as a continuous surface parallel to the partition wall 2, but
(2) Since the yarn bundle has a length of 0.5 to several meters, it may be constructed as a discontinuous surface consisting of a plurality of surfaces parallel to the partition wall 2. Further, the attachment surface t may be constructed by erecting a net-like or porous plate material against the partition wall 2 at a position that does not impede the flow, for example, parallel to the flow. Further, the upper end of the plate is preferably provided slightly below the water surface. When the upper end of the board is located above the water surface rather than slightly below it, the flow velocity across the adhesion surface becomes smaller, so the adherent filamentous algae floats above the water surface due to oxygen bubbles generated as a result of photosynthesis, and this oxygen is directly absorbed. It spreads throughout the country and its purification ability decreases considerably.

In this example as well, similar to the effect of the embodiment shown in FIG. 7, substantially equal flow velocities can be obtained within the flow paths. In addition, if the raw wastewater has high turbidity or chromaticity and low transparency, the adhering surface t
The water depth can be appropriately set to be shallow.

In any case, in the present invention, all the wastewater can be brought into contact with the adherent filamentous algae f periodically and reliably by the 52 positions of the partition wall 2, and the inside of the treatment tank 1 can be maintained in an energy-saving manner and reliably. At the same time, the oxygen generated by photosynthesis is dissolved in the circulating wastewater and is immediately transported to the subordinate parts at the bottom where it is consumed, so that the oxygen stagnates in the surface layer and becomes supersaturated and diffuses into the atmosphere. Therefore, oxygen generated through photosynthesis can be used effectively without loss.

In addition, since the partition wall 2 is set to 322 (322) and the sessile filamentous algae are allowed to adhere and proliferate on the top thereof, the irradiated light is preferentially used for the sessile filamentous algae f, and does not reach the bottom of the treatment tank 1. The growth of algae is suppressed, and this synergistic effect allows the sessile filamentous algae f to become the dominant species.At the same time, the capacity of the dependent part can be freely set, without increasing the h&crotch area. , processing retention days can also be increased.

FIG. 9 is a plan view showing another embodiment of the present invention.

The processing tank 1 is configured as one meandering waterway, and this waterway is divided into upper and lower parts by a partition wall 2, and the upper and lower sides are communicated at both ends of the waterway, so that the inside of the processing tank is configured as one endless flow path. That is, the device shown in FIGS. 1 and 2 is made meandering in a plane. If a long and narrow site cannot be used, if the structure is configured as in this embodiment, the power cost for water circulation will not increase.

FIG. 10 is a longitudinal sectional view showing yet another embodiment of the present invention. A communication channel C1 provided with an aeration pipe 5 for water circulation is provided in the middle part of the processing tank 1, and a communication channel C2 is provided at both ends of the processing tank 1.
The inside of the processing tank 1 is configured as a 1° endless flow path that branches into two in the middle and becomes one flow path again.

FIG. 11 is a longitudinal sectional view showing yet another embodiment of the present invention. 2! A communication channel C1 is provided at both ends of the burial tank 1 with aeration pipes 5 for water circulation, and a communication channel C2 is provided in the middle of the processing tank 1. It is configured as an endless flow path.

FIG. 12 is a combination of FIGS. 10 and 11, and shows another embodiment of the present invention in a longitudinal sectional view. Diffuser pipes 5 for water circulation 1) at both ends and in the middle of the treatment tank 1
A communication flow path c1 is provided, and each communication flow path C1 is
A communication flow path c2 is provided in the middle of the processing tank 1, and the inside of the processing tank 1 is configured as one endless flow path that intersects in the middle.

Actual hFJt shown in FIGS. 10, 11 and 12
For example, it solves problems such as insufficient dissolved elements in the latter half of the dependent part when the treatment tank 1 is excessively long, or extreme differences in water depth and flow velocity at both ends of the algae part a. be.

In all of the above embodiments, the attachment surface t on which the adherent filamentous algae f adheres is preferably a rough or porous surface.

Sessile filamentous algae f often attaches to these and proliferates.

13 and 14 are explanatory diagrams showing a part of the AA longitudinal section and B-8 longitudinal section of the apparatus shown in FIG. 1, respectively. The partition wall 2 is formed of corrugated asbestos slate C and is installed so that its uneven parts are parallel to the flow, and its upper surface is roughened to form an adhesion@1. Along this attachment surface t, the adherent filamentous algae f forms an uneven layer,
Propagates adherently.

In this case, compared to the case where the attachment surface t is formed as a uniform plane, the attachment area and light-receiving area per unit facility area increase, the irradiation light intensity is spatially diluted, and light energy is converted into algae. Efficiency increases, growth rate per unit facility area increases, and purification! 2! The burrowing capacity and the yield of sessile algae are increased.

Moreover, when the partition wall 2 itself is used as the attachment surface t in this way, there is no need to install a separate attachment surface, construction is simple, and construction costs are low. At the same time, the flow resistance in the PJ section a is reduced, and the power cost for forming the circulating flow is also reduced.

In addition, in order to configure the partition wall 2 as an attachment surface t, a porous material such as cloth as the attachment surface t may be adhered to the upper surface of the board forming the partition wall 2, or gravel, artificial grass, etc. The partition wall 2 may also be formed at the same time. In any case,
Construction is easy.

Next, the advantages of the present invention will be summarized.

(1) Greater water depth than normal high rate oxidation method,
It has excellent heat retention properties and can effectively utilize oxygen generated through photosynthesis.

(2) Even in a shallow and wide processing tank, it can be stirred completely in an energy-saving manner, promoting the growth of microorganisms, and preventing sedimentation and putrefaction of solid matter.

(3) There is no 5vash out of algae, and an appropriate amount of algae can be maintained with simple operations.This allows the retention time to be set arbitrarily to meet the treatment target, and it is stable against fluctuations in load amount. Can be processed.

(4) Sessile filamentous algae f is difficult to be preyed upon by microscopic animals;
It can be processed stably throughout the year.

(5) Algae can be easily and reliably separated and recovered, and the recovered material is suitable as feed or fertilizer.

(6) Similar to the high rate oxidation method, N,
P can also be efficiently removed.

(7) The ring system bundle formed by the adherent filamentous algae f becomes a fixed bed of microorganisms that generate oxygen and have a purifying function.

As described above, according to the apparatus of the present invention, wastewater can be efficiently and highly processed and at the same time can be converted into a useful resource.

Furthermore, the apparatus of the present invention can be used for mass culture of adherent algae such as seaweed using an artificial culture solution.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention. FIG. 2 is a longitudinal sectional view taken along the line A-A of the device shown in FIG. FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention. FIG. 4 is a longitudinal sectional view showing yet another embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing another embodiment of the present invention. FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention. FIG. 7 is a longitudinal sectional view showing yet another embodiment of the present invention. FIG. 8 is a longitudinal sectional view showing yet another embodiment of the present invention. FIG. 9 is a plan view showing another embodiment of the present invention.
FIG. 10 is a longitudinal sectional view showing yet another embodiment of the present invention. FIG. 11 is a longitudinal sectional view showing yet another embodiment of the present invention. FIG. 12 is a longitudinal sectional view showing yet another embodiment of the present invention. 13 is an enlarged view of a part of the AA vertical section in FIG. 1, and FIG. 14 is an enlarged view of a part of the B-Bit 2 cross section in FIG. 1. 1 is a treatment tank, 2 is a partition wall, 3 is a ventilation pipe, 4 is a screen,
5 is a diffuser pipe, 6 is a flow control valve, 7 is a foam stopper, 8 is an impeller, 9 is a motor, 10 is a casing, 11 is an underwater aerator, 112 is a partition, 13 is a partition, at is an algae part, h is a subordinate , C1 is a communication channel, C2 is a communication channel, f is an adherent filamentous algae, t is an attachment surface, and b is a bubble.

Claims (1)

[Claims] 1. A device for biologically treating wastewater, the device being formed in a container for treating wastewater filled with a mixture of wastewater and microorganisms, (a ) an algae section provided with an attachment surface that is irradiated with light and allows adherent filamentous algae to adhere and grow; and (b) an algae section that connects the inflow and outflow sections of the algae section and allows heterotrophic microorganisms to grow therein. (c) a channel communicating the algae section and the dependent section, and (d) a water circulation device for circulating wastewater through the algae section and the dependent section; and (d) a water circulation device. The interior is divided into upper and lower parts with partition walls, the upper part is configured as the algae part that is irradiated with natural light, and the lower part is configured as the dependent part,
The algae part and the dependent part are configured as one endless flow path connected by the communication flow path, and the water circulation device for starting the circulating flow of water along this endless flow path is installed in the communication flow path or A wastewater treatment device characterized in that it is provided above a communication flow path. 2. The wastewater treatment device according to claim 1, wherein the water circulation device is equipped with a flow rate conversion mechanism. 3. Claim 1 or 2, characterized in that the partition wall is slightly sloped slightly toward the outlet side of the algae section.
Wastewater treatment equipment as described in section. 4. The wastewater treatment apparatus according to claim 1, 2, or 3, characterized in that a foam stopper is provided at the inlet of the algae section. 5. To capture detached adherent filamentous algae in the upper part or inside of the communication channel on the outflow side of the algae section,
The wastewater treatment apparatus according to claim 1, 2, 3, or 4, characterized in that a screen is provided. 6. The wastewater treatment apparatus according to claim 1, 2, 3, 4, or 5, wherein the upper surface of the partition wall is configured as an attachment surface. 7. Claim 1, wherein the attachment surface is configured as an uneven surface parallel to the flow direction.
The wastewater treatment device according to item 1 or 2 or 3 or 4 or 5 or 6.