WO1998055407A1

WO1998055407A1 - Method and apparatus for treating wastewater

Info

Publication number: WO1998055407A1
Application number: PCT/JP1998/002501
Authority: WO
Inventors: Norihiko Hirano
Original assignee: Norihiko Hirano
Priority date: 1997-06-06
Filing date: 1998-06-05
Publication date: 1998-12-10
Also published as: KR20010029446A; CN1228064A; AU725812B2; AU7551098A; JP3285884B2; CN1095449C; KR100492683B1

Abstract

A method and apparatus for treating secondarily wastewater by circulating primarily treated water T1 after removal of dust and inclusions contained in wastewater inside a water line for biological treating, wherein a weir (5) for forming a shooting flow energy absorber having an openable lower portion is provided inside circulating water lines (3a, 3b, 3c) in order to conduct any of an aerobic treating by only an overflow, an anaerobic treating by only a underground flow and aerobic and anaerobic treatings by both of the overflow and the underground flow. In addition to the secondary treating using the shooting flow energy absorber, a higher-level treating is carried out by a biological treating using contact materials.

Description

Description Wastewater treatment method and equipment Technical field

The present invention relates to an inexpensive wastewater treatment apparatus that is suitable for wastewater, especially domestic wastewater, and small and medium-sized sewage treatment, has good treated water quality, is easy to maintain and manage, and is inexpensive. Background art

Conventionally, there is a “batch activated sludge method” for small and medium-sized sewage treatment. This involves intermittent aeration in a single tank and sedimentation and discharge.However, in order to stably treat the water to be treated with fluctuating water quality, it is necessary to carefully control its operation and maintain it. There is a problem that management is difficult.

Another well-known method is the contact aeration method, which is easier to maintain and maintain.However, this method alone does not adequately remove the nitrogen required at present. There is a problem that is.

In addition, there is the so-called “oxidation ditch method,” which is easy to maintain and withstand fluctuations in throughput. This method is a type of floating organism method, in which sewage is introduced into a circulating waterway, and aeration is performed while circulating the sewage to perform biological treatment.

In this method, in order to perform aeration and flow, a rotor system that mechanically agitates sewage to perform aeration and flow is generally used.However, this mechanical aeration cannot be deepened due to surface aeration. However, there is a problem that the installation area becomes large, and when a blow type that blows air is employed, a large power for flow is required.

Instead of such a mechanical aeration and flow method, a “aeration method using falling water flow” has also been proposed based on a method of providing a step in the circulation channel (Japanese Patent Publication No. Hei 11-37-1995). .

According to this method, although the above-mentioned problem of the mechanical aeration method is solved, it is a recent problem because the aeration and the flow source use a so-called head. The anaerobic treatment required to remove nitrogen and phosphorus becomes insufficient. Above all, anaerobic agitation, which is indispensable for efficient nitrogen removal, cannot be performed. As a result, there is a problem that advanced treatment of wastewater becomes difficult. Then, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a new wastewater treatment apparatus particularly suitable for small- and medium-sized sewage treatment. In other words, the present invention is to provide an advanced wastewater treatment apparatus with simple facilities, compact and inexpensive, easy maintenance, and good quality of treated water. Disclosure of the invention

In order to achieve the above object, the following measures are adopted.

Claim 1 is a secondary wastewater treatment method for biological treatment by circulating primary treatment water from which garbage and contaminants contained in wastewater are removed in a waterway, wherein: Weirs are formed to form an open flow deenergizer that can be opened.Aerobic treatment only by overflow, anaerobic treatment only by underflow, and aerobic treatment and anaerobic treatment by both overflow and underflow Adopt a wastewater treatment method that can also perform

In this method, aerobic treatment to oxidatively decompose organic substances and anaerobic treatment mainly to denitrification can be freely selected or combined, so efficient wastewater treatment suited to the characteristics of wastewater such as sewage can be achieved. It becomes possible.

The wastewater treatment according to claim 1, wherein the ratio of aerobic treatment to anaerobic treatment can be freely adjusted by adjusting the opening amount of the lower part of the weir. Adopt the method.

This means that the opening amount of the lower part of the weir can be adjusted so that aerobic treatment and anaerobic treatment can be freely selected or combined, as well as the ratio of overflow and underflow, that is, aerobic treatment. By adjusting the ratio of wastewater treatment and anaerobic treatment, efficient wastewater treatment suited to the properties of wastewater can be achieved.

Claim 3 is a secondary wastewater treatment device for biologically treating the primary treatment water from which wastewater and contaminants are removed from the wastewater in the circulation channel, wherein the treated water sucked from the terminal end of the circulation channel. Pump that discharges water to the beginning of the water channel, and circulation There will be a weir located in the middle of the canal and composed of vertical walls and sloped walls to reduce the discharge.

And, "the vertical movement of the weir main body itself", "the vertical slide of the open / close plate provided on the vertical wall surface of the weir main body, which is fixed with an opening formed between the weir main body and the water channel bottom", "the weir" Rotation of an on-off valve installed at the lower opening of the main body of the weir, which is fixed with an opening formed between the main body and the bottom of the waterway "," Tilt in the flow direction of the vertical wall constituting the main body of the weir " An anaerobic treatment is performed by passing underflow circulating water from the opening below the weir, and aeration is performed by blasting the circulating water overflowing from above the weir. A wastewater treatment device that can freely select either or both of pneumatic treatment.

In this means, when a weir that allows the weir body to move up and down is fixed to the bottom of the tank, treated water can be overflowed from above the weir and only aerobic treatment by spray jumping can be performed. it can. Further, when the weir body is fixed above the water channel, only the anaerobic treatment can be performed by allowing the circulating water to flow downward from below the weir without overflowing the treated water from above the weir. Furthermore, when the weir body is fixed at an intermediate position in the vertical direction of the water channel, the treated water overflows from above the weir and circulating water flows downward from the opening below the weir, resulting in aerobic treatment and anaerobic treatment. Can perform both types of processing.

In this way, if only the position of the weir is adjusted according to the properties of the treated water, either aerobic treatment or anaerobic treatment or both can be arbitrarily and appropriately selected.

Next, in a case where a means for vertically moving an opening / closing plate provided on a vertical wall surface of a weir body fixed by forming a sedimentation opening portion with the bottom of the waterway is adopted, the opening / closing plate is provided with an aerobic treatment and Acts as an adjusting member that allows one or both of the anaerobic treatments to be appropriately selected.

That is, by appropriately selecting the fixing position of the opening / closing plate, the opening amount of the sedimentation opening / the position of the upper end of the weir changes, and the ratio between the aerobic treatment and the anaerobic treatment can be adjusted more easily. .

When a rotatable on-off valve is installed in the sedimentary opening formed between the fixed weir body and the water channel bottom, the on-off valve changes the opening amount of the sedimentation opening, The ratio between the aerobic processing and the anaerobic processing can be easily adjusted. Further, in the means for tilting the vertical wall constituting the weir main body with respect to the inclined wall, the tiltable vertical wall is adjusted so that one or both of the aerobic treatment and the anaerobic treatment can be appropriately selected. It will act as a member. That is, the opening amount of the deposition opening changes depending on the amount of tilt, and the ratio of aerobic processing to anaerobic processing is easily adjusted.

According to a fourth aspect of the present invention, there is provided the wastewater treatment apparatus according to the third aspect, wherein an angle of a slope formed on the downstream side of the weir main body is variable.

The weir with a variable angle of the flushing water surface is capable of freely adjusting the falling angle and falling speed of the circulating water overflowing from above the weir, thereby adjusting the amount of the splashing water, that is, the amount of aeration. Fulfill.

In Claims 5 and 6, a sinking weir is provided at the bottom of the circulation channel around the weir body described in Claims 3 and 4, respectively.

These sinking weirs disturb the flow of circulated treated water that flows below and below the weir, thereby amplifying the effect of anaerobic agitation.

In Claims 7 and 8, in the wastewater treatment apparatus described in Claims 5 and 6, respectively, the discharge port of the circulating pump is provided for forming a subsurface formed below the weir. Provided toward the deposition opening.

The outlets of the circulating pumps provided to these sinking openings ensure that the circulating water flows downflow through the sinking openings and that the circulating water strikes the sinking weirs. The effect of the anaerobic stirring is further amplified.

In claim 9, the wastewater treatment device that performs secondary treatment by charging the secondary treated water treated by the wastewater treatment method described in claim 1 or claim 2 A large number of flexible fibrous contact materials having portions that oscillate due to the circulating flow are installed in the circulation channel at intervals in the flow direction, and the contact materials carry organisms to form a biological treatment zone. While performing aeration upstream of the biological treatment zone, the secondary treatment water is circulated and flowed to perform aerobic treatment and anaerobic treatment.

In claim 10, any of claims 3 to 8 may be used. A flexible fibrous contact material having a portion that oscillates by a circulating flow by a wastewater treatment device that performs secondary treatment by charging secondary treatment water treated by the wastewater treatment device described in any of the above. A large number of wastewater treatment plants are installed in the circulation channel at intervals in the direction of the flow channel, and a biological treatment zone is formed by supporting organisms on the contact material.Aerobic and anaerobic treatment is performed by circulating and flowing the secondary treated water. I do.

In the means of Claims 9 or 10, in addition to the secondary treatment using the jet deenergization, a higher-order treatment by biological treatment using a contact material is performed. More purified treated water can be obtained.

Further, in these means, since a “flexible fiber contact material having a portion that swings by a circulating flow” is used, the flow resistance of the contact material with respect to the circulating flow is reduced. In addition, the loading of organisms becomes efficient and strong, and an excellent biofilm is formed.

In Claims 11 and 12, a strand obtained by bundling fibers is used as the flexible fibrous contact material according to any one of Claims 9 and 10. -With these means, the strands of the bundles oscillate and disperse in the water, increasing the surface area where organisms attach and form biofilms.

In claims 13 to 16, the flexible fibrous contact material described in each of claims 9 to 12 is made of carbon fiber.

Carbon fiber has excellent bioadsorption properties and functions as a more effective contact material. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view schematically showing a first embodiment of a primary and secondary treatment stage before a higher treatment of a wastewater treatment apparatus according to the present invention.

FIG. 2 is a view taken along the line X--X in FIG. 1 of the embodiment. FIG. 2 (a) shows a state in which a movable weir body provided in the apparatus is fixed to the tank bottom. (B) is a view showing that the dam body is fixed at a substantially middle position in the vertical direction of the tank, and (c) is a view that the dam body is fixed at an upper position of the tank. FIG. Fig. 3 is a view taken along the line X-X in Fig. 1 showing a modification of the weir. Fig. 3 (a) shows a vertical slide type open / close plate provided on the vertical wall part on the upstream side of the fixed weir. Fig. 3 (b) shows a state where the opening / closing plate is fixed at the upper position. It is a figure showing signs that a deposition opening is formed below.

Fig. 4 is a view taken along the line X-X of Fig. 1 showing another modified example of the weir. Fig. 4 (a) shows a state where the on-off valve provided at the lower opening of the fixed weir is in a vertical state and is deposited. FIG. 4B is a view showing a state in which the opening is closed, and FIG. 4B is a view showing a state in which the on-off valve is in a horizontal state and opens an area below the weir main body.

Fig. 5 is a view taken along the line XX of Fig. 1 showing still another modification of the weir. Fig. 5 (a) shows that the lower end of the tiltable vertical wall forming the weir is fixed to the tank bottom. (B) is a view showing that the vertical wall is tilted to the downstream side to form a deposition opening in the lower region of the weir main body.

Fig. 6 shows that the discharge port of the circulating pump is provided toward the sedimentation opening below the movable weir, and that the sinking weir is formed at the bottom of the tank around the sedimentation opening. It is an X-X arrow view.

FIG. 7 is a simplified plan view of a wastewater treatment apparatus provided with a labyrinth-like circulating water channel according to a second embodiment of the present invention.

FIG. 8 is a simplified plan view of a spiral wastewater treatment device according to a third embodiment of the present invention.

Fig. 9 is a simplified plan view showing a wastewater treatment system in which a primary treatment system and a secondary treatment system using a jet streamer and a high-order treatment system with contact materials are installed side by side ₍ Fig. 1 ₎ . 0 is an external perspective view showing the wastewater treatment apparatus in a simplified manner, omitting a primary treatment part and the like.

FIG. 11 is a partial cross-sectional view taken along the line X--X shown in FIG. 9 showing a state where the contact material is attached to the circulation channel.

FIG. 12 is a schematic diagram showing another embodiment of the high-order processing apparatus.

Figures 13 and 13 show experimental data obtained when wastewater treatment was performed with a secondary treatment device using a jet streamer and a secondary treatment device using a contact material. (A) shows the BOD concentration. FIG. 4B is a diagram showing a change, (b) is a diagram showing a change in total nitrogen concentration, and (c) is a diagram showing a change in ammonia nitrogen concentration. BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described based on examples.

First, a secondary processing method and apparatus using the jet deenergization will be described with reference to FIGS. 1 to 8 attached.

First, reference numeral 1 (1a, 1b, 1c) shown in FIGS. 1 to 8 indicates a processing tank body.

A substantially rectangular treatment tank main body 1a constituting the wastewater treatment apparatus according to the first embodiment of the present invention in FIG. 1 is provided with one end open in the central longitudinal direction of the region in the treatment tank. A partition wall 2a is formed, and a U-turn circulating water passage 3a partitioned by the partition wall 2a is formed.

In the vicinity of the circulating water channel 3a, a primary treatment apparatus I including a screen device, a sedimentation tank, a sludge dewatering facility, a flow control tank, and the like (not shown) is installed. Raw wastewater R such as sewage first flows into the primary treatment equipment I, and is subjected to so-called “primary treatment” that removes trash and contaminants in the raw wastewater R.

Then, in the primary treatment device I, the flow rate is adjusted to become primary treatment water T 1, which flows from the primary treatment device I to the circulation water channel 3 a constituting the primary treatment device Π.

Next, the circulation pump denoted by reference numeral 4 is composed of a suction pipe 9a connected to the end 7a of the circulation channel 3a and a discharge pipe 9b connected to the beginning 7b of the circulation channel (the discharge port of the circulating water is connected to the It is used to circulate and process the treated water in the circulation channel 3a.

By changing the discharge amount (or discharge speed) of the treatment water discharged from the circulation pump 4, the circulation speed of the treatment water can be appropriately selected.

Reference numeral 5 shown in FIG. 1 indicates a weir body, and the width of the circulation channel 3a is set in the middle of the circulation channel 3a at a position close to the beginning 7b of the channel at a predetermined interval from the end 7b. It is installed to partition in the direction.

The reason why the weir body 5 was installed at a position close to the water channel start end 7b in this manner is that anaerobic agitation described later is performed by effectively utilizing the flow rate of the treated water discharged from the circulation pump 4 through the discharge pipe 9b. This is because the biological treatment can be performed efficiently, and the biological treatment can be performed efficiently. Here, the weir main body 5a shown in FIG. 2 shows an embodiment of a weir installed so as to be movable in the vertical direction by a method in which the main body 5a itself is appropriately selected.

As a method of moving the weir main body 5a up and down, for example, a side end of the weir main body 5a is fitted in an up / down groove provided on a side wall of a water channel, and is appropriately moved to an arbitrary position while sliding up and down. Arbitrary means such as a method of fixing the dam body 5a and a rack and pinion mechanism on the side wall of the weir and the side wall of the water channel, and setting and fixing the weir body 5a at an arbitrary position by rotating gears, etc. Can be adopted.

It is preferable that the position of the weir main body 5a be adjusted mechanically and automatically. In this case, the gear of the rack and pinion is driven by power, or the weir main body 5a is simply It is conceivable to hang it with a lane-like object and fix it at an appropriate position.

As shown in FIGS. 2 (a) to 2 (c), the weir body 5a is used when treated water overflowing from the upstream vertical wall 6a and the upper part of the weir body 5a falls obliquely downward. It has a shape with a sloping wall 6b that serves as a water surface.

That is, the vertical wall 6a is arranged toward the upstream side and has a function of blocking the treated water, while the slope wall 6b is blocked by the vertical wall 6a, and It functions as a gazebo for the treated water overflowing from the upper end, and constitutes a so-called “granulated flow”.

Here, the inclined wall 6b is engaged with the vertical wall 6a so that the angle α can be changed. This engagement can be achieved by, for example, pivotally connecting the vertical wall 6a and the running water sloping wall 6b to fix the sloping wall 6b at an arbitrary angle.

By changing the angle α, the speed and the angle at which the treated water flows down the inclined wall 6b can be changed. That is, it is possible to adjust the aerobic treatment by changing the state in which the treated water is jetted and jumped to change the amount of air entrainment, that is, the amount of aeration. Normally, the processing is performed by adjusting the angle ct of the inclined wall 6b to about 45 ° ± 5 to 10 °.

Hereinafter, the primary and secondary wastewater treatment methods using the wastewater treatment device according to the present embodiment will be specifically described. First, as described above, raw wastewater R such as sewage is supplied to a screen device (not shown) for removing solids, a sedimentation tank (not shown) for settling and removing suspended substances, and the flow rate is adjusted. After flowing into the primary treatment device I, which is composed of a flow control tank (not shown), which is turned into primary treated water T1, it is supplied to the circulation channel 3a and biologically treated (screen device, sedimentation tank) Appropriate equipment can be used for each pretreatment device such as a flow control tank according to the properties of the treated water.)

Activated sludge for the treatment of suspended organisms is charged in the circulation channel 3a in advance, and is circulated together with the inflowing treated water. For this reason, pollutants in the treated water are biologically decomposed and removed under anaerobic and / or aerobic conditions while circulating and flowing (hereinafter referred to as “secondary treatment”).

Then, the secondary treated water T 2 is withdrawn from the circulation water channel 3 a by, for example, an overflow pipe (or a communication pipe), and a post-treatment device (not shown) such as a sedimentation treatment tank (when the secondary treatment is terminated) ) Or to a higher-order processing device described below (for further higher-order processing). In addition, any means can be used as appropriate as a means for supplying and extracting the treated water.

Here, the “secondary treatment” will be described in more detail. In the secondary treatment device provided with the jet deenergization, when only aeration treatment is performed first, as shown in FIG. a is fixed to the bottom B of the tank, and all the circulated treated water overflows and splashes from above the weir body 5a, and so-called "aeration" is performed using the entrainment of air. As a result, the amount of dissolved oxygen in the treated water is increased, and active biological treatment by aerobic microorganisms is performed (hereinafter, referred to as “aerobic treatment”). On the other hand, when performing biological treatment of the circulated treated water with anaerobic microorganisms, as shown in Fig. 2 (c), the weir body 5a is placed above to block the surface area of the circulating water, Underflow water is formed by circulating treated water from the sedimentation opening 8 formed between a and the tank bottom B.

In this case, since the treated water does not overflow from the upper part of the weir body 5a, aeration is not performed, and only the underflow water is anaerobically treated biologically (hereinafter, referred to as "anaerobic treatment").

Also, as shown in Fig. 2 (b), weir body 5a is fixed at a substantially middle position in the vertical direction. Then, a part of the circulated treated water overflows from above the weir main body 5a and is jetted out to perform aerobic treatment, and the deposition opening formed between the weir main body 5a and the tank bottom B. From 8, it is also possible to perform anaerobic treatment of underflow water by passing circulating treated water. In this way, the ratio of the aerobic treatment to overflow water and the anaerobic treatment to underflow water is freely adjusted by adjusting the fixed position of the weir body 5a in the vertical direction according to the properties of the treated water. can do. For example, in the case of wastewater containing a large amount of ammonia nitrogen, increase the amount of anaerobic treatment to promote nitrification and denitrification.

That is, the secondary treatment device according to the present invention can not only perform aerobic treatment by aeration and anaerobic treatment without exposure to air at the same time, but also adjust the ratio of both treatments appropriately to obtain a wide range of properties. This is useful as a wastewater treatment device that can handle treated water.

Further, in the secondary treatment device according to the present invention, as shown in FIG. 3, a weir body 5b provided with an opening / closing plate 11 which can be slid vertically along the vertical wall 6a is used. Can also.

The weir body 5b is fixed at a substantially intermediate position of the tank 1a, and a deposition opening 8 is always formed between the weir body 5b and the tank bottom B. However, when the opening / closing plate 11 attached to the vertical wall 6a of the main body 5b slides up and down along the vertical wall 6a, the deposition opening 8 can be freely opened and closed.

As shown in FIG. 3 (b), the opening / closing plate 11 is provided so as to be slidable up to a position higher than the upper end of the fixed weir body 5b. Therefore, it is possible to completely block the flow of the surface water of the circulating treatment water and perform only the anaerobic treatment on the underflow water passing through the sedimentation opening 8.

By adjusting the position of the open / close plate 11, the circulating water overflows from above the fixed weir body 5b, and at the same time, the circulating water passes through the sedimentation opening 8 to form underflow water. It is possible, and the ratio of both can be selected as appropriate. As shown in FIG. 4, instead of the opening / closing plate 11, an opening / closing valve 12 in the form of a butterfly valve or the like may be installed so as to cross the tank 3 a at the deposition opening 8. In this configuration, the on-off valve 12 is rotated as shown in FIGS. Then, the opening amount of the sedimentation opening 8 is adjusted to adjust the quantitative ratio of the overflow or the underflow. Further, a weir body 5c having a vertical wall 6a formed in a plate shape as shown in FIGS. 5 (a) and 5 (b) may be employed. By tilting the vertical wall 6a in the downstream direction around the upper end of the weir main body 5c to form the deposition opening 8, underflow water can also be formed.

By adjusting the amount of tilt of the vertical wall 6a, it becomes possible not only to allow the circulating water to overflow from above the fixed weir body 5c but also to allow the circulating water to pass through the sedimentation opening 8. The ratio can also be appropriately selected. In this respect, it is similar to the weir bodies 5a and 5b described above.

In the case of the weir bodies 5b and 5c, as in the case of 5a, the angle of the slope 6b is made variable, and the speed and angle at which the treated water flows down the slope 6b are changed. It is possible.

Next, FIG. 6 shows an embodiment in which a sinking weir 10 is provided on the tank bottom B around the deposition opening 8 in the area below the weir main body 5a.

The sinking weir 10 in the present embodiment plays a role of disturbing the underflow water (the treated water flowing through the tank bottom B) passing through the sedimentation opening 8, and the provision of the sinking weir 10 enables anaerobic stirring. The effect can be amplified.

In this case, if the discharge pipe 9b is installed so as to discharge the circulating treated water in the direction of the sinking weir 10, the circulating treated water will efficiently collide with the sinking weir 10, so that the effect of anaerobic agitation is surely enhanced. (Even if weir bodies 5b and 5c are adopted, similar effects can be obtained by providing sinking weir 10).

In the embodiment described above, the U-turn circulating water channel 3a provided with the partition wall 2a along the longitudinal direction of the treatment tank main body 1a is adopted.However, in a narrow installation space, As in the embodiment shown in FIG. 7, it is possible to form a partition wall 2b in a zigzag shape on a substantially square tank body 1b to form a labyrinth-shaped circulation water passage 3b.

In the case of this embodiment, the entire wastewater treatment device can be made planar and more compact. The shape of the dam body 5 (5a, 5b, 5c), the mounting method, and the setting method of the sinking weir 10 and the discharge pipe 9b are described in Figs. The configuration is the same as shown in FIG.

Furthermore, as in the embodiment shown in FIG. 8, the circulation channel 3c may be formed in a planar spiral using a spiral (or spiral) tank 1c. In this case, the flow in the circulation channel 3c is smoothed, and the secondary treatment water T2 is discharged into the space formed in the center, so that the space in the center is, for example, settled. If used as a tank, the equipment can be configured more compactly. Next, an embodiment relating to a higher-order treatment apparatus installed to further purify the treated water secondary-treated by the above-described means will be described with reference to FIGS. 9 to 12. FIG.

First, reference numeral に shown in FIGS. 9 and 10 indicates a secondary processing device using a jet deenergization device, and reference numeral 示す shown in the drawing indicates a higher-order processing device using a contact material.

Both devices [pi, IE are arranged in parallel, Overall, rectangular and have _c each device [pi which have the appearance and, in the processing tank 1 of 1Pai, the partition walls 2 a, 2 each one is released c is formed to form U-turn shaped circulation channels 3a and 3d. As described above, the secondary treatment device Π is provided with a weir body 5 (5a, 5b, 5c) for reducing the jet flow as described above, in the middle of the circulating water channel 3a. The contact material holding rods 13 are provided at predetermined intervals above the waterway so as to cross the circulation waterway 3d, and a plurality of fibrous contact materials 14 are provided on each of the rods 13 for a predetermined time. It is vertically suspended at intervals.

The fibrous contact material 14 shown enlarged in Fig. 11 is a strand that binds a necessary amount of ultra-fine carbon fiber and the like.The holding rod 13 is a steel bar whose surface is covered with PVC. Insulating the fiber. Here, the holding rod 13 is supported by a receiver 20 attached to the upper part of the side wall of the tank main body 1 forming the circulation channel 3d (see FIG. 11).

Hereinafter, the high-order treatment will be described in detail. The secondary treatment water T 2 treated by the secondary treatment device 取 is taken from the circulation channel 3 a by the overflow pipe (or communication pipe) 15. Then, it flows into the sedimentation tank 16 of the high-order processing tank Π. In the sedimentation tank 16, the secondary treatment water T2 is solid-liquid separated into settled sludge and supernatant water.

Here, instead of the overflow pipe (or connecting pipe) 15, an air-lift pump 2 1 (Not shown in Fig. 10; refer to Fig. 12). In this case, a method in which aeration and flow promotion are performed at the same time is adopted, and the secondary treated water T2 may be pumped and dropped into the water channel 3d. In this case, aeration by dropping can be further performed, so that the efficiency of aerobic treatment (oxidative decomposition of organic matter, nitrification of ammonia nitrogen) and anaerobic treatment (denitrification of nitrate nitrogen) can be increased. it can. Depending on the properties of the water to be treated, any pumping device such as an Archimedes pump can be used.

Subsequently, the secondary treated water T 2 flowing into the water channel 3 d is discharged from the settling tank 16 to the biofilm zone 19 a formed at a predetermined portion of the circulation water channel 3 d (the fibrous contact material 14 In the area of the circulating water channel).

Here, at the start of the advanced treatment using biofilm zone 19a, seed sludge is put into a water channel and acclimated for a necessary period as in the conventional activated sludge method or biofilm catalytic oxidation method. . Thereby, a strong and large amount of biofilm can be formed on each fibrous contact material 14.

As a result, on the upstream side of biofilm zone 19a, the remaining dissolved oxygen causes biological oxidation by aerobic treatment, and the remaining components not treated by the secondary treatment are removed and dissolved. Anaerobic denitrification is performed in the downstream region where oxygen is consumed.

When setting the range of this biofilm zone 19a, take into account the quality of the water to be treated and the quality of the effluent, and adjust the spacing, quantity, aeration rate, and circulation speed of the fibrous contact materials 14 as appropriate. .

In this case, in this embodiment, since the holding rod 13 to which the contact member 14 is fixed is placed on the circulation channel 3d and is detachably provided, the adjustment work is easy. The method of attaching the contact material 14 is not limited to the embodiment, and any appropriate method can be adopted. However, if a means for detachably attaching from the upper part of the waterway is adopted, the biological treatment zone 19 a Setting work becomes easy.

In addition, in this embodiment, since strands in which ultrafine fibers are bundled are used, each single fiber is separated in a waterway, and microorganisms adhere to the surface of each single fiber. It has a high density and adheres firmly and hardly peels off. Furthermore, take each contact material 14 so that it hangs under water and swings. As a result, the formation of biofilms is easy and robust.

The carbon fiber used for the contact material 14 has a strong and thick biofilm, high biological treatment efficiency (SS, BOD, TN, TP removal rate and removal rate) and high quality of treated water. It can be. Above all, it has been confirmed that the PAN-based carbon fiber has better adhesion of microorganisms.

As described above, since the fibrous contact material 14 hangs down in the circulation channel 3d, the circulating flow of the treated water is not hindered, and the biological treatment is performed without blocking due to sludge. In addition, the biofilm density is high because the ultrafine fiber contact material 14 is used. Therefore, the treatment efficiency is high, the sludge is not separated, and the solid-liquid separation of the treated water is simplified. Also, compared to conventional circulating channel treatment, sludge accumulation does not occur, so that the flow rate can be reduced and the treatment efficiency can be further improved and the quality of treated water can be improved.

The high-order treated water T 3 biologically treated while flowing through the above-mentioned biofilm zone 19 a becomes the circulating water 3 d after the pollutants still contained in the treated water are removed in the final treatment tank 17. , Is subjected to the necessary post-treatment 18 and discharged.

FIG. 12 shows an embodiment of another high-order processing apparatus having a compact shape. In this embodiment, the secondary treatment water T2 flows into the settling tank 16 by appropriate means, is then pumped up by the air lift pump 21a, and is aerated and flows by dropping into the circulation channel 3e. The promotion is carried out at the same time.

Thereafter, the biofilm zone 19 b having the same configuration as that of the embodiment shown in FIGS. 9 and 10 was disposed at the terminal end 22 of the circulation waterway 3 e while performing biological treatment such as denitrification. Pumped by the air lift pump 21b, dropped into the starting end 23 of the circulating water channel 3e, and further circulated repeatedly (in the embodiment of the secondary treatment Π shown in FIGS. 9 and 10). Also, treated water is extracted from the 3d end of the circulating water channel by an air lift pump (not shown), dropped and flowed to the 3d starting end of the circulating water channel, and the circulating flow is repeated.)

After the high-order treatment, the high-order treatment water T3 is withdrawn from the middle of the circulation channel 3e or is withdrawn from the final treatment tank provided in the space formed inside the circulation channel 3e. 17, After post-treatment in post-treatment tank 18, it is discharged outside the equipment. Based on Fig. 13 below, experimental data obtained when aerobic treatment was performed by the secondary treatment device using the jet deenergization and aerobic / anaerobic treatment by the high-order treatment device using the contact material explain.

In the experiment, the BOD concentration, total nitrogen concentration, and ammonium nitrogen concentration were measured for the influent raw water (R), secondary treated water (T 2), and higher treated water (T 3) on June 6, 1997. The measurements were taken on June 27 and July 3 of the same year.

Figure 13 shows the measurement results with the concentration (mg ZL) on the vertical axis and each measurement day on the horizontal axis. For each measurement day, the inflow raw water (R), secondary treated water (T 2), high-order water It is the measured value of the treated water (T 3) in a bar graph.

First, as shown in Fig. 13 (a), in each measurement S, the BOD concentration in the secondary treated water (T 2) was greatly reduced compared to the BOD concentration in the inflow raw water (R), It can be seen that the water is further reduced by the secondary treatment water (T 3).

In other words, a combination of aerobic secondary treatment and anaerobic high-order treatment is effective.In anaerobic treatment in the high-order treatment process, the contact filter media captures aerobic effluent sludge and exhibits stable purification capacity. It became clear that.

Next, as shown in Fig. 13 (b), it was confirmed that the treatment of total nitrogen was clearly performed even within a short period of time (about one month) from the start-up, and the data on July 3 was confirmed. In, total nitrogen shows a concentration of 10 mg / L or less. If the anaerobic treatment capacity of the contact filter media is further increased, it can be expected that the total nitrogen concentration will be further reduced.

As shown in Fig. 13 (c), the concentration of ammonia nitrogen decreases with time, and nitrification, which is a prerequisite for total nitrogen removal, has progressed favorably. However, it can be seen that most of the ammonia nitrogen in the inflowing raw water R is nitrified.

As described above, in any of the above embodiments, the quality of treated water can be improved with a simple device. Industrial applicability As is clear from the above description, the industrial applicability of the invention disclosed by the present application is as follows.

(1) In the waterway for biological treatment by circulating wastewater, weirs are formed that form a downwardly openable jet flow deceleration.Aerobic treatment only by overflow, anaerobic treatment only by underflow, and overflow A wastewater treatment method that can perform both aerobic and anaerobic treatments by both flow and submerged flows makes it possible to freely select or combine aerobic and anaerobic treatments. Efficient secondary wastewater treatment suited to the characteristics of wastewater is possible.

(2) Aerobic and anaerobic treatments by adjusting the amount of opening below the weirs provided in the waterway to enable the ratio of aerobic and anaerobic treatments to be adjusted. Not only can be freely selected or combined, but also the ratio of aerobic treatment and anaerobic treatment can be freely adjusted according to the characteristics of wastewater, achieving efficient secondary wastewater treatment Can be.

(3) More specifically, the treated water is circulated by a circulation pump that discharges from the end to the beginning of the circulation channel, and is disposed in the middle of the circulation channel, and is composed of vertical walls and inclined walls. An open / close plate provided on the vertical wall surface of the weir main body, which is provided with a weir that reduces the jet flow and moves the weir main body up and down integrally, or forms an opening between the bottom of the waterway and is fixed By moving the open / close valve installed in the opening below the weir body fixed by forming an opening with the bottom of the waterway, or by forming a weir body, and forming a plate shape Aerobic treatment in which the circulating water overflowing from the upper part of the weir is tilted by the tilted vertical wall, and / or anaerobic treatment in which the underflow circulating water passes through the opening below the weir. It is possible to provide a wastewater treatment apparatus in which either one can be freely selected.

That is, if the vertically movable weir body is fixed at the upper position, overflow of the circulating water from above the weir is eliminated, and only from the submerged opening formed between the weir and the bottom of the circulating water channel. Only anaerobic treatment can be performed by discharging circulating water. When the weir body is fixed to the bottom of the tank, only the aerobic treatment by the blast water can be performed by overflowing the treated water from above the weir body. When the weir body is fixed at a middle position in the vertical direction of the waterway, the treated water overflows from above the weir and Only the anaerobic treatment can be performed by passing underflow circulating water only from the side. -In this way, the aerobic treatment and / or the anaerobic treatment by passing underflow circulating water from the opening below the weir by means that can freely select the position of the weir main body. Can be provided.

(4) Opening and closing valves are provided at the opening between the fixed weir body and the bottom of the waterway when the opening / closing plate provided on the vertical wall surface of the weir body is fixed with an opening formed between the bottom of the waterway and the waterway. When installed, one or both of aerobic treatment and anaerobic treatment can be appropriately and easily selected by adjusting the vertical position of the open / close plate and the rotational position of the open / close valve.

(5) Even when the vertical wall forming the weir body is tilted with respect to the inclined wall, the tiltable vertical wall can appropriately select one or both of aerobic treatment and anaerobic treatment. The amount of tilting changes the opening amount of the sedimentation opening to easily adjust the ratio of aerobic treatment to anaerobic treatment.

(6) By providing a sinking weir at the bottom of the circulating water channel around the weir, the flow of the circulating water is disturbed to generate the stirring effect, and the effect of anaerobic stirring of the underflow circulating water can be amplified. By providing the discharge port of the circulation pump toward the immersion opening, the effect of anaerobic stirring can be further amplified.

(7) The treated water can be circulated smoothly by providing a zigzag partition wall on the substantially square tank body and forming a circulating water channel in the shape of a lapis, or by forming a planar spiral water channel. However, efficient secondary wastewater treatment is possible even in a narrow place.

(8) In addition to the above-mentioned effects of the secondary treatment device using the jet streamer, the wastewater treatment by the high-order treatment device that forms the biofilm zone in the circulation channel using the contact material reduces the organic matter. Decomposition, removal and denitrification can be performed effectively.

(9) The present invention not only provides an efficient aerobic and anaerobic wastewater treatment method and apparatus suitable for medium- and small-scale sewage treatment that is simple, compact, inexpensive, and easy to maintain and maintain, but also provides wastewater. A wastewater treatment method and a wastewater treatment device capable of freely performing treatment according to the properties of the wastewater can be provided.

Claims

The scope of the claims -

1. In the secondary wastewater treatment method where biological treatment is performed by circulating the primary treated water from which waste and contaminants are removed from the wastewater,

In the waterway, a weir is formed to form a discharge deceleration that can be opened in the lower region, and aerobic treatment by only overflow, anaerobic treatment by only underflow, aerobic by both overflow and underflow, and A wastewater treatment method characterized by the ability to perform either anaerobic treatment or anaerobic treatment.

2. The wastewater treatment method according to claim 1, wherein the ratio of aerobic treatment to anaerobic treatment can be freely adjusted by adjusting the amount of lower opening of the weir.

3. In the secondary wastewater treatment equipment that treats the primary treated water from the wastewater from which waste and contaminants have been removed in the circulation channel,

A circulating pump for discharging treated water sucked from the end of the circulating water channel to the beginning of the water channel, and a weir disposed in the middle of the circulating water channel and composed of a vertical wall and a sloping wall to form a jet flow deceleration,

Vertical movement of the weir body itself, vertical slide of an open / close plate provided on the vertical wall surface of the weir body fixed with an opening formed between the weir body and the waterway bottom, and an opening between the weir body and the waterway bottom The opening and closing valve provided at the lower opening of the weir main body where the portion is formed and fixed, and the vertical wall constituting the weir main body is tilted in the direction of the flow path. Anaerobic treatment by passing underflow circulating water through the opening on one side, and / or aerobic treatment by aerating by circulating water overflowing from above the weir to allow aerating Wastewater treatment equipment characterized by the following:

4. The wastewater treatment apparatus according to claim 3, wherein an angle of a slope formed on a downstream side of the weir main body is variable.

5. The wastewater treatment apparatus according to claim 3, wherein a sinking weir is provided at a bottom of the circulation channel around the weir body.

6. The wastewater treatment apparatus according to claim 4, wherein a sinking weir is provided at a bottom of the circulating water channel around the weir main body.

7. The drainage treatment apparatus according to claim 5, wherein the discharge port of the circulation pump is provided toward an underflow forming deposition opening formed below the weir.

8. The drainage treatment device according to claim 6, wherein a discharge port of the circulation pump is provided toward a submerged flow opening formed below the weir.

9. A wastewater treatment apparatus that performs the secondary treatment by adding the secondary treatment water treated by the wastewater treatment method according to claim 1 or 2, further comprising:

By providing a large number of flexible fibrous contact materials having portions that oscillate due to the circulating treated water at predetermined intervals in the flow channel direction in the circulating water channel, the living materials can be carried on the contact materials. A wastewater treatment apparatus, wherein a biological treatment zone is formed, and aerobic treatment and anaerobic treatment are performed by circulating and flowing secondary treatment water.

10. A wastewater treatment device that performs the secondary treatment by adding the secondary treatment water treated by the wastewater treatment device according to any one of claims 3 to 8 to the wastewater treatment device. 10. ,

By providing a large number of flexible fibrous contact materials having portions that oscillate due to the circulating treated water at predetermined intervals in the flow channel direction in the circulating water channel, the living materials can be carried on the contact materials. A wastewater treatment apparatus, wherein a biological treatment zone is formed to circulate and flow secondary treatment water to perform aerobic treatment and anaerobic treatment.

11. The wastewater treatment apparatus according to claim 9, wherein the flexible fibrous contact material is a strand in which fibers are bundled.

12. The wastewater treatment apparatus according to claim 10, wherein the flexible fibrous contact material is a strand in which fibers are bundled.

13. The wastewater treatment apparatus according to claim 9, wherein the flexible fibrous contact material is carbon fiber.

14. The wastewater treatment apparatus according to claim 10, wherein the flexible fibrous contact material is carbon fiber.

15. The wastewater treatment apparatus according to claim 11, wherein the flexible fibrous contact material is carbon fiber.

13. The wastewater treatment apparatus according to claim 12, wherein the flexible fibrous contact material is carbon fiber.