JPH1110190A - Upward flow anaerobic treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make sludge, which ascends in a treatment tank in the company with an ascending flow from a biological sludge bed and accumulates on a treatment water discharge path, return surely to the biological sludge bed. SOLUTION: An upper part of a treatment tank 12 is partitioned into a treatment water discharge passage 16 and a gas collection part 20 having a space 18 for storing gas by dividing in a vertical direction, and the treatment water discharge passage 16 is connected underwater with a bottom end of the gas collection part 20 for communication with each other, and when sludge is accumulated on the treatment water discharge passage 16, water level in the treatment water discharge passage 16 is lowered by a water level regulator 24 using gas pressure generated in the treatment tank 12. The sludge is made to fall onto a biological sludge bed from a bottom end of the treatment water discharge passage 16 by a water level descending force at the time of lowering the water level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upflow anaerobic treatment apparatus, and more particularly to an upflow anaerobic treatment apparatus which generates gas when treating organic wastewater through a biological sludge bed.

[0002]

2. Description of the Related Art In recent years, anaerobic treatment of organic wastewater has attracted attention as a treatment method capable of recovering energy gas such as methane gas from organic wastewater. In this type of upflow anaerobic treatment equipment, the biological sludge bed is kept in a blanket state at a certain height, and a part of the biological sludge bed floating on the liquid surface of the treatment tank accompanying the treated water. It is important to return the sludge to the biological sludge bed again without flowing it out of the apparatus. When the biological sludge flows out of the apparatus, there is a problem in that the sludge amount on the biological sludge bed is reduced and the treatment capacity is reduced. Furthermore, if the sludge is entrained in the treated water, the quality of the treated water deteriorates, which is not preferable.

Conventionally, as a countermeasure, there are those described in, for example, JP-A-1-242197 and JP-A-6-19900. Japanese Patent Application Laid-Open No. 1-2242197 has a gas sludge separator formed so that the diameter of the upper side is gradually reduced above the biological sludge bed in the treatment tank, and the gas sludge separator rises with the upward flow. The sludge is caused to collide with the gas sludge separator, and the upward flow is reversed by the baffle plate.

In Japanese Utility Model Application Laid-Open No. 6-19900, a three-phase separator having a sludge impingement member is provided above a biological sludge bed in a treatment tank, and sludge that rises with the upward flow is removed. By colliding with a sludge colliding member, air bubbles adhering to the sludge are separated, and the sludge is easily settled.

[0005]

However, even if a gas sludge separator or a sludge impingement member is provided as in the prior art, the sludge that has risen in the treatment tank accompanying the upward flow flows into the upper part of the treatment tank. In particular, there is a drawback that the treated water is not fundamentally solved because it is deposited at a discharge portion leading to the trough.

[0006] In addition, gas is actively generated with the increase in gas generation activity in the biological sludge bed, and in addition to the upward flow of treated water,
Since the biological sludge soars due to the agitating action of the generated gas, it is not possible to prevent the sludge from flowing out only by its own weight sedimentation. The present invention has been made in view of such circumstances, and a part of the sludge which rises in the treatment tank accompanying the upward flow from the biological sludge bed and accumulates in the treated water discharge passage is surely removed from the biological sludge. An object of the present invention is to provide an upward anaerobic treatment device that can be returned to the floor.

[0007]

According to the present invention, in order to achieve the above object, organic wastewater is passed upward through an anaerobic biological sludge bed formed in a treatment tank to remove organic matter in the wastewater. In an upflow anaerobic treatment device that exhausts gas generated by the treatment to the outside of the treatment tank while performing the treatment, an upper part of the treatment tank is provided with a gas having a treated water discharge passage and a space for storing the gas. A partition member vertically partitioned into a collecting section, a lower end of the treated water discharge path and the lower end of the gas collecting section communicating with each other in water, and a partition member provided outside the processing tank and collected in a space of the gas collecting section. The water level of the gas collecting unit is adjusted by changing the gas pressure in the space by adjusting the exhaust pressure of the gas that has been exhausted, and the water level of the treated water discharge passage is linked to the adjustment of the water level of the gas collecting unit. Water level adjusting means for adjusting the water level, said water level adjusting means The water level lowering force when lowering the water level of the treated water discharge passage, the sludge deposited on the treated water discharge path, characterized in that dropping settle to the biological sludge bed from the lower end of the treated water discharge channel.

According to the present invention, the upper portion of the treatment tank is vertically divided into partitions by a partition member into a treated water discharge passage and a gas collecting portion having a space for storing the gas, and the treated water discharge passage is partitioned. And the lower end of the gas collecting section is communicated in water, and when sludge is deposited in the treated water discharge passage, the water level of the treated water discharge passage is adjusted by water level adjusting means using the pressure of gas generated in the treatment tank. Lower. The deposited sludge is dropped and settled on the biological sludge bed from the lower end of the treated water discharge channel by the water level lowering force at the time of lowering the water level.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the upward flow anaerobic treatment apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view illustrating a first embodiment of an upward flow anaerobic treatment device 10 according to the present invention.

The upward-flow anaerobic treatment device 10 mainly comprises
Treatment tank 12 in which organic wastewater as raw water is supplied in an upward flow
And a biological sludge bed formed at the lower part of the treatment tank 12 and reacting with the organic matter in the organic wastewater to treat the organic matter, and the upper part of the treatment tank 12 is formed by the treated water discharge passage 16 and the treatment. A partition member 22 for partitioning into a gas collecting portion 20 having a space 18 for storing gas, and a water level adjusting device 24 provided outside the processing tank 12 and adjusting the water level of the treated water discharge passage 16
And

The treatment tank 12 is formed in a cylindrical shape with only the upper surface opened, and a raw water supply pipe 26 is provided on the floor thereof, and a raw water supply pump 28 is provided in the raw water supply pipe 26. Thereby, the organic wastewater supplied into the treatment tank 12 by the raw water supply pipe 26 flows upward in the treatment tank 12 and rises. A biological sludge bed having a certain height is formed in a lower part in the treatment tank 12. Further, a trough-like trough 30 through which the processing water flows is provided in the upper inner periphery of the processing tank 12, and the processing water flowing into the trough 30 is discharged out of the processing tank 12 through the processing water pipe 31.

The partition member 22 is formed in a cylindrical shape smaller than the diameter of the processing tank 12 and only the lower end is opened, and the lower portion of the cylindrical shape is expanded in a trumpet shape. The lower half of the partition member 22 is disposed so as to be submerged under the surface of the wastewater stored in the treatment tank 12. This allows
An annular treated water discharge passage 16 formed by the side wall 12A of the treatment tank 12 and the partition member 22 is formed at an upper part in the treatment tank 12, and the treated water treated by the biological sludge bed is treated water discharged passage 16 Through the trough 30. In addition, partition member 2
A gas collection unit 20 having a space 18 for storing gas generated from the biological sludge bed is formed in an upper part of the inside 2.

The water level adjusting device 24 is provided outside the processing tank 12. The water level adjusting apparatus 24 is mainly connected to a water tank 34 to which gas discharged from the processing tank 12 is sent, and one end communicates with the space 18 of the gas collecting unit 20. The two communication pipes 36 and 38 each including a first communication pipe 36 and a second communication pipe 38 whose ends are located in the water in the water tank 34, and the two communication pipes 36 and 38 are provided for communication. Open / close valves 40 and 42 for opening and closing. In FIG. 1, the first and second communication pipes 36 and 38 are
Although the case where the communication pipes are branched from the middle is shown, the space 18 of the gas collecting unit 20 and the water tank 34 may be connected by independent communication pipes.

The first communication pipe 36 and the second communication pipe 38 are located in the water tank 34 with a water depth difference h. Thereby, the space 18 of the gas collection unit 20 and the water tank 34
When only the first communication pipe 36 is communicated between
Water depth difference h compared to the case where only the second communication pipe 38 is communicated.
Is applied to the first communication pipe 36, so that the gas becomes difficult to flow. Therefore, the space 18 of the gas collecting section 20
The pressure rises and lowers the water surface of the gas collecting unit 20 by a pressure corresponding to the water depth difference h. The water level of the gas collecting unit 20 at this time is indicated by A in the figure.

Conversely, when switching from a state in which only the first communication pipe 36 is in communication to a state in which only the second communication pipe 38 is in communication, the pressure in the space 18 of the gas collection unit 20 decreases. Then, the water surface of the gas collecting unit 20 is raised by a pressure corresponding to the water depth difference h. The water level of the gas collecting unit 20 at this time is indicated by B in the figure. Then, the gas collecting section 20 and the treated water discharge path 16
When the water level of the gas collecting part 20 drops to the water level A, the water level of the treated water discharge passage 16 rises to the position indicated by the water level C, and the gas collecting part 20 When the water level rises to the water level B, the treated water discharge passage 16 falls to the water level D.

When the water level of the gas collecting part 20 is lowered, that is, when the water level of the treated water discharge passage 16 is raised, the water depth difference h is increased from the upper end of the treated water discharge passage 16 to the trough 30. It is set so that the treated water overflows. A collision plate 44 having a triangular cross section is provided below the treated water discharge passage 16 in the inner periphery of the treatment tank 12. The collision plate 44 is used for the gas rising in the processing tank 12
The path is changed to the side, so that the gas is prevented from entering the treated water discharge path 16. Furthermore, the sludge which is going to enter the treated water discharge passage 16 along with the treated water is collided to separate gas from the sludge, thereby facilitating sedimentation.

The gas sent to the water tank 34 is sent to and stored in a storage tank such as a gas tank. Next, the operation of the upward flow anaerobic treatment device 10 configured as described above in the first embodiment will be described. The operation of the upflow anaerobic treatment device 10 is started with the open / close valve 40 of the first communication pipe 36 opened and the open / close valve 42 of the second communication pipe 38 closed. The organic wastewater is supplied as an upward flow from the raw water supply pipe 26 to the bottom of the treatment tank 12. Processing tank 1
The organic wastewater supplied to 2 reacts with the biological sludge in the biological sludge bed to decompose the organic matter in the wastewater and generate gas by decomposing the organic matter. The treated water in which the organic matter is decomposed in the biological sludge bed rises in the treatment tank 12 with the gas and a part of the biological sludge in the biological sludge bed, and passes through the treated water discharge passage 16 to the trough 30. Overflow. on the other hand,
The gas generated in the biological sludge bed rises in the processing tank 12 and is collected in the space 18 of the gas collecting unit 20. At this time, since only the first communication pipe 36 communicates between the space 18 of the gas collection unit 20 and the water tank 34, the space pressure of the gas collection unit 20 increases, and The water surface falls to the water level A. As a result, the water level of the treated water discharge passage 16 becomes C
Therefore, the treated water in the treated water discharge passage 16 overflows to the trough 30.

When the operation of the upward flow anaerobic treatment device 10 is continued, a part of the sludge of the biological sludge bed entrained by the treated water accumulates in the lower part of the treated water discharge passage 16, and the sedimentation interface rises. Sediment sludge flows out of the trough 30 together with the treated water.
Therefore, according to the present invention, when a certain amount of sludge accumulates in the treated water discharge passage 16 or periodically by a timer or the like, the second
The valve 42 of the communication pipe 38 is opened. In this case, the first communication pipe 36 is always open. As a result, the space pressure of the gas collecting unit 20 decreases, and the water level of the gas collecting unit 20 rises from A to B. In conjunction with this, the water level of the treated water discharge passage 16 drops from C to D. The sedimentation force is given to the sludge accumulated in the treated water discharge passage 16 by the water level lowering force when the water level falls from C to D. As a result, the sludge deposited in the treated water discharge passage 16 falls from the treated water discharge passage 16 and is returned to the biological sludge bed in the treatment tank.

Next, when the valve 42 of the second communication pipe 38 is opened, the water level of the gas collecting section 20 is gradually increased by the gas generated in the reaction tank 12 and is from the water level B to A. It decreases over time, and when it decreases to A, the outflow of the treated water resumes. Next, the second embodiment to the sixth embodiment of the upward flow anaerobic treatment device of the present invention will be described, and the same devices and members as those of the first embodiment will be denoted by the same reference numerals. The description is omitted here.

FIG. 2 is a cross-sectional view of an upward anaerobic treatment device 10 for explaining a second embodiment of the present invention. As shown in FIG. 2, the second embodiment is different from the first embodiment in that the treated water discharge passage 16 of the upflow anaerobic treatment device 10 described in the first embodiment is used.
Provided with a filter medium layer 46. This filter medium layer 46
It may be a fixed type or a floating filter medium layer using a floating filter medium in water. When a floating filter medium is used, it is necessary to dispose a supporting member such as a wire mesh above the floating filter medium layer.

According to the second embodiment of the present invention, the sludge deposited in the treated water discharge passage 16 is reliably captured by the filter medium layer 46 so as not to flow out of the treated water discharge passage 16 along with the treated water. can do. Further, when the water level in the treated water discharge passage 16 is lowered, the treated water in the treated water discharge passage 16 flows back through the filter medium layer 46 (flow reverse to the time of filtration), so that the washing of the filter medium layer 46 is automatically performed. Can be done In the cleaning of the filter medium layer 46, if the filter medium layer 46 is composed of a floating filter medium, the floating filter medium moves irregularly when the treated water flows backward, so that the cleaning effect is further enhanced due to the contact between the filter media and the like.

FIG. 3 is a cross-sectional view of an upflow anaerobic treatment device 10 for explaining a third embodiment of the present invention. As shown in FIG. 3, the third embodiment is different from the first embodiment in that a third communication pipe 48 with an on-off valve 47 is further provided on the two communication pipes 36 and 38 described in the first embodiment. Communication pipes 36, 38,
48, so that the water level of the gas collecting unit 20 can be changed in three stages of A, B, and E. Further, between the water level B and the water level E, a funnel-shaped scum collector 5 having an open upper surface.
0 was provided, and a scum storage tank 52 provided outside the processing tank 12 at a position lower than the scum collector 50 was communicated with a scum discharge pipe 54.

The difference in water depth between the three communication pipes 36, 38, 48 is determined by the difference in water depth h ₂ between the first communication pipe 36 having the largest water depth and the second communication pipe 38, and the _second difference. Communication pipe 38
And the third communication pipe 48 having the smallest water depth, h ₁ , and the first communication pipe 36 and the third communication pipe 48 have a water depth difference h ₀ (h ₀
= H ₁ + h ₂ ). Thereby, each communication pipe 36, 3
The relationship between 8, and 48 and the water level of the gas collecting part 20 and the treated water discharge passage 16 is as follows. When only the first communication pipe 36 is connected, the water level of the gas collecting part 20 is the lowest A. Water discharge path 16
Is the highest water level C at which the treated water overflows the trough. Similarly, when the water level of the gas trapping unit 20 when only the second communication pipe 38 is communicated is B, the water level of the treated water discharge passage 16 is D, and when only the third communication pipe 48 is communicated. The water level of the gas collecting section 20 is E, and the water level of the treated water discharge passage 16 is F.
Becomes

Although the filter medium layer 46 described in the second embodiment is not shown in FIG. 3, a filter medium layer 46 may be provided. According to the third embodiment of the present invention, when only the first communication pipe 36 is communicated, the operation is started with the water level of the gas collection unit 20 in the A state, and the sludge is accumulated in the treated water discharge passage 16. Only the second communication pipe 38 is communicated to lower the water level of the treated water discharge passage 16 from C to D to drop sludge. Then, when a lot of scum (floating sludge) comes to float on the water surface of the gas collecting unit 20, only the third communication pipe 48 is connected to raise the water level of the gas collecting unit 20 to E. Thereby, the scum collector 50 is submerged and the water including the scum floating on the water surface flows into the scum collector 50.
As a result, scum that adversely affects the gas collection and deteriorates the quality of the treated water can be removed.

FIG. 4 is a cross-sectional view of an upflow anaerobic treatment device 10 for explaining a fourth embodiment of the present invention. As shown in FIG. 4, the fourth embodiment is different from the first embodiment in that the treated water discharge passage 16 of the upflow anaerobic treatment device 10 described in the first embodiment is used.
Is closed at the upper end. That is, the space 56 of the treated water discharge passage 16 and the space 58 of the water tank 34 are
And the trough 30 is U-shaped and one end of the U-shaped pipe is located on the treated water discharge passage 16 side.
The other end was opened to the atmosphere side. Also, trough 3
An auxiliary trough 60 is provided outside the zero and the treated water pipe 31 communicates with the auxiliary trough 60. As a result, the space 56 of the treated water discharge passage 16 is sealed with the water of the trough 30 to shut off the treated water discharge side of the treated water discharge passage 16 from the atmosphere.
The treated water overflows from the trough 30 to the auxiliary trough 60 and is discharged out of the treatment tank 12 via the treated water pipe 31.

According to the fourth embodiment, a part of the gas entering the treated water discharge passage 16 can be sent to the water tank 34 without being released to the atmosphere. Further, it is possible to promote effective use of gas. FIG. 5 shows a modification of the fourth embodiment, in which the end of the air supply pipe 62 on the water tank 34 side is located at the same water depth as the second communication pipe 38, and the valve 64 is connected to the second communication pipe 38. Is provided. Further, the upper portion of the treated water discharge passage 16 is formed in a U-shaped tubular shape, and one end of the U-shaped tube is connected to the treated water discharge passage 16.
And the other end is opened to the atmosphere. Thus, the space 56 of the treated water discharge passage 16 is sealed with the water of the treated water discharge passage 16. In this case, the trough 30 is provided outside the treated water discharge passage 16 on the atmospheric side.

According to this modification, at the start of operation, the gas collection unit 20 is opened by the first communication pipe 36 which is always open.
And the water tank 34 are communicated. As a result, the water depth difference h between the first communication pipe 36 and the air supply pipe 62 causes the gas trapping section 2
Since the pressure of the space 18 of 0 becomes higher than the pressure of the space 56 of the treated water discharge passage 16, the water level of the gas collecting unit 20 is pushed down to A. Therefore, the water level of the treated water discharge passage 16 becomes C, and the treated water overflows into the trough 30. Then, when the sludge accumulated in the treated water discharge passage 16 is dropped, the valve 64 of the second communication pipe 38 is opened to allow communication between the gas collection unit 20 and the water tank 34. As a result, the difference in water depth between the second communication pipe 38 and the air supply pipe 62 disappears, so that the pressure in the space 18 of the gas collection unit 20 and the space 56
And the water level of the gas collecting unit 20 rises to B. Since the water level of the treated water discharge passage 16 falls from C to D in conjunction with this rise, the accumulated sludge falls. Thereafter, when the valve 64 of the second communication pipe 38 is closed, the pressure gradually increases due to the gas generated in the reaction tank 12,
The water level drops from the water level B to A over a period of time, and when the water level drops to A, the overflow of the treated water starts again.

FIG. 6 is a sectional view of an upflow anaerobic treatment device 10 for explaining a fifth embodiment of the present invention, which is a combination of the second embodiment and the fourth embodiment. is there.
Therefore, according to the fifth embodiment, both effects described in the second and fourth embodiments can be obtained. FIG. 7 is a cross-sectional view of an upward anaerobic treatment device 10 for explaining a sixth embodiment of the present invention, which is a combination of the third embodiment and the fourth embodiment.

Therefore, according to the sixth embodiment, the third
And both effects described in the fourth embodiment can be obtained.

[0030]

EXAMPLE An experiment was conducted to confirm the effect of the upward anaerobic treatment apparatus of the present invention. FIG. 8 shows the processing tank part of the test apparatus used for the confirmation test, and FIG. 9 shows the test results. In the embodiment, the SS concentration (suspension concentration) of the sludge suspended in the treated water in the treated water discharge passage 16 immediately after returning the accumulated sludge dropped from the treated water discharge passage 16 by the operation of the water level adjusting device 24 is determined. The difference was checked depending on the height of the water discharge passage 16 (immediately after the return in FIG. 9).

As a comparative example, the SS concentration of the sludge suspended in the treated water in the treated water discharge passage 16 when the accumulated sludge was not dropped from the treated water discharge passage 16 for 70 hours by operating the water level adjusting device 24 was determined. It was checked (no return in FIG. 9). In addition, the SS concentration of the sludge suspended in the treated water in the treated water discharge passage 16 after 60 minutes and 90 minutes immediately after the return was examined (after 60 minutes and 90 minutes in FIG. 9).

As shown in FIG. 8, the sampling of the treated water in the treated water discharge passage 16 is performed by connecting sampling pipes 70, 70... With a valve to tank heights of 290 cm, 320 cm, and 340 cm from the bottom of the treatment tank 12. The treated water was sampled also from the overflow position of the trough 30 406 cm from the bottom while being provided at each position. Although not shown, the tank height at a position below the treated water discharge passage 16 is 230c.
A sampling pipe with a valve was also provided at the position of m.

In FIG. 9, ─ indicates the result of the example, and ─ indicates the result of the comparative example. Dotted lines are the results after 60 minutes and 90 minutes. ●
And ○ show the height position of the sampling pipe 70 with a valve. As can be seen from the results of FIG. 9, in the case of the embodiment immediately after the fall of the deposited sludge, the SS concentration of the sludge suspended in the treated water in the treated water discharge passage 16 is such that the tank height is 406 to 320 cm.
Was almost zero. This means that the treated water discharge passage 16
Shows that the sludge entrained in the treated water flowing into the trough 30 from the upper end of the sludge is substantially zero. Further, at a tank height of 290 cm, which is the lower end position of the treated water discharge passage 16, the SS concentration of the sludge suspended in the treated water was about 18000 mg / l, which was equivalent to the SS concentration at a tank height of 230 cm.

On the other hand, in the case of the comparative example in which the sediment sludge was not dropped for 70 hours, the SS concentration was about 3000 mg even at a tank height of 406 cm where the treated water in the treated water discharge passage overflowed to the trough.
/ L. This indicates that the interface of the accumulated sludge has risen to the overflow position to the trough, and a large amount of sludge flows out of the treated water flowing into the trough 30 from the upper end of the treated water discharge passage 16. Means that. Furthermore,
The SS concentration is about 30,000 when the tank height is 320 to 340 cm.
mg / l, which was an extremely high concentration.

From the results 60 minutes and 90 minutes immediately after the return shown by the dotted lines, it can be seen that the interface of the accumulated sludge is rising in a short time, and that the SS concentration itself is also increasing. Do you get it.

[0036]

As described above, according to the upflow anaerobic treatment apparatus of the present invention, when sludge is deposited in the treated water discharge passage, the water level adjusting means utilizing the pressure of the gas generated in the treatment tank. , The water level of the treated water discharge passage is lowered, and the sludge deposited by the water level lowering force at the time of lowering the water level is settled on the biological sludge bed from the lower end of the treated water discharge passage.

Thus, a part of the sludge accumulated in the treated water discharge passage accompanying the upward flow from the biological sludge bed can be reliably returned to the biological sludge bed. Therefore, while improving the quality of the treated water discharged from the treatment tank,
Since the sludge on the biological sludge bed does not decrease, the treatment performance can be maintained high.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view for explaining a first embodiment of an upward anaerobic treatment device of the present invention.

FIG. 2 is a longitudinal sectional view illustrating a second embodiment of the upward flow anaerobic treatment device of the present invention.

FIG. 3 is a vertical cross-sectional view illustrating a third embodiment of the upward flow anaerobic treatment device of the present invention.

FIG. 4 is a longitudinal sectional view illustrating a fourth embodiment of the upward flow anaerobic treatment device of the present invention.

FIG. 5 is a longitudinal sectional view for explaining a modification of the fourth embodiment of the upward flow anaerobic treatment device of the present invention.

FIG. 6 is a longitudinal sectional view illustrating a fifth embodiment of the upward flow anaerobic treatment device of the present invention.

FIG. 7 is a longitudinal sectional view illustrating a sixth embodiment of the upward flow anaerobic treatment apparatus of the present invention.

FIG. 8 is an explanatory view for explaining a test apparatus of the upward anaerobic treatment apparatus of the present invention.

FIG. 9 is an explanatory view illustrating an embodiment of the upward flow anaerobic treatment device of the present invention and a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Upflow type anaerobic treatment apparatus 12 ... Treatment tank 16 ... Treated water discharge path 18 ... Space of gas collection part 20 ... Gas collection part 22 ... Partition member 24 ... Water level adjustment device 26 ... Raw water supply pipe 28 ... Raw water Supply pump 30 Trough 34 Water tank 36 First communication pipe 38 Second communication pipe 40, 42, 47 Open / close valve 44 Impact plate 46 Filter medium layer 48 Third communication pipe 50 Scum collection Container 56: Space of treated water discharge channel 62 ... Air supply pipe 70 ... Sampling pipe with valve

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Naoki Abe 1-1-1 Uchikanda, Chiyoda-ku, Tokyo Inside Hitachi Plant Construction Co., Ltd.

Claims (4)

[Claims] An organic wastewater is treated by passing an organic wastewater in an upward flow through an anaerobic biological sludge bed formed in a treatment tank, and a gas generated by the treatment is discharged from the treatment tank. In the upward flow anaerobic treatment device, the upper part of the treatment tank is vertically partitioned into a treated water discharge passage and a gas collecting part having a space where the gas is stored, and the treated water discharge passage is provided. And a partition member at which the lower end of the gas collection unit communicates in water; and a gas pressure in the space, which is provided outside the processing tank and adjusts exhaust pressure of gas accumulated in the space of the gas collection unit. Water level adjusting means for adjusting the water level of the gas collecting section by changing the water level of the gas collecting section, and adjusting the water level of the treated water discharge passage in conjunction with the adjustment of the water level of the gas collecting section. Water level drop when the water level of the treated water discharge channel is lowered by means Accordingly, the treated water discharge passage to the deposited sludge, the treated water discharge passage upflow anaerobic treatment apparatus characterized by dropping settle to the biological sludge bed from the lower end of. 2. The water level adjusting means is provided outside the processing tank, and a water tank to which gas discharged from the processing tank is sent, one end of which is communicated with a space of the gas collecting unit, and 2. An upward flow, comprising: two or more communication pipes positioned so as to have different water depths in the water in the water tank; and valve members provided in each of the communication pipes. Anaerobic treatment device. 3. An upflow anaerobic treatment apparatus according to claim 1, wherein a filter medium layer for catching sludge entrained by said upflow is provided in said treated water discharge passage. 4. An upward anaerobic treatment apparatus according to claim 1, further comprising scum removing means for removing scum floating on the liquid surface of said gas collecting section.