JP2013240727A - Biological wastewater treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wastewater treatment apparatus generating no excess sludge.SOLUTION: A biological wastewater treatment apparatus includes a pretreatment tank X1 and at least one biodegradation-digestion tank A provided with an air diffuser 4, and a fixed filter bed 2 for anaerobic microorganisms disposed below a fixed filter bed 1 for aerobic microorganisms. An upper part of the biodegradation-digestion tank A is provided with an inflow port for allowing treated water to flow from the prior-stage pretreatment tank X1 or biodegradation-digestion tank A into the following biodegradation-digestion tank A, and a deepest part of the biodegradation-digestion tank A is provided with an outflow port for allowing the treated water to flow out to a subsequent-stage agglomeration separation tank B or biodegradation-digestion tank A.

Description

  The present invention relates to a biological wastewater treatment apparatus. More specifically, the present invention relates to a biological wastewater treatment apparatus using aerobic microorganisms and anaerobic microorganisms.

As a treatment facility for purifying wastewater with almost no generation of surplus sludge, “a treatment facility for organic wastewater having at least two biological treatment tanks, and a total capacity of the at least two biological treatment tanks” On the other hand, a fixed filter bed (4) is installed in a biological treatment tank corresponding to a volume of at least 1/2 or more, and the filter medium (8) of the fixed filter bed (4) has a specific surface area of 60 to 100 m ² / m ^3. And the filling rate of the filter medium (8) with respect to the tank volume of the biological treatment tank in which the fixed filter bed (4) is installed is 70 to 90% by volume. An organic wastewater treatment facility (Patent Document 1) is known.

JP 2006-263503 A

In the conventional treatment equipment, there is a problem that waste water cannot be purified in a state where there is almost no generation of excess sludge.
An object of the present invention is to provide a wastewater treatment apparatus in which excess sludge is not generated.

The features of the biological wastewater treatment apparatus of the present invention are a pretreatment tank (X),
An aeration tool (da), a fixed filter bed for aerobic microorganisms (ae) and at least one tank of a biodegradation digester tank (A) provided with a fixed filter bed for anaerobic microorganisms (an);
The main point is that the fixed filter bed for anaerobic microorganisms (an) is disposed below the fixed filter bed for aerobic microorganisms (ae).

  The biological wastewater treatment apparatus of the present invention can efficiently treat aerobic microorganisms and anaerobic microorganisms, and therefore does not generate surplus sludge (such as dead microorganisms).

It is a flow sheet (side view) showing typically one mode of the biological waste water treatment equipment of the present invention. In the biological wastewater treatment apparatus of the present invention, an aeration nozzle is used as an air diffuser, and bubbles supplied from the aeration nozzle in the ascending region (ua) rise together with the treated water, and a descending region ( It is the conceptual diagram (side view) which represented typically a mode that treated water descend | falls in da) and treated water convects (a broken line represents the flow of treated water). Of the biological wastewater treatment apparatus of the present invention, a gas-liquid mixing ejector is used as a diffuser, and the discharged mixed liquid is discharged on the upper part of the fixed filter bed (ae) for aerobic microorganisms. It is the conceptual diagram (side view) which represented typically a mode that the gas-liquid mixing ejector was arrange | positioned so that a direction might become a horizontal direction (a broken line represents the flow of treated water). Of the biological wastewater treatment apparatus of the present invention, a gas-liquid mixing ejector is used as a diffuser, and the discharged mixed liquid is discharged to the lower part of the fixed filter bed (ae) for aerobic microorganisms. It is the conceptual diagram (side view) which represented typically a mode that the gas-liquid mixing ejector was arrange | positioned so that a direction might become a horizontal direction (a broken line represents the flow of treated water). In the biological wastewater treatment apparatus of the present invention, a gas-liquid mixing ejector is used as a diffuser, and the gas-liquid mixing ejector is bubbled so that the discharging direction of the discharged mixed liquid is upward. It is the conceptual diagram (side view) which represented typically a mode that it has arrange | positioned to a raise area | region (ua) (a broken line represents the flow of treated water). It is the side view which represented the biodegradation digestion tank (A) prepared in the Example typically (a 3-digit number represents a dimension (mm)).

  As the pretreatment tank (X), a known pretreatment tank can be used, which is scattered in the presence of a raw water tank for adjusting the flow rate and concentration fluctuation of drainage, and agglomerates containing aerobic microorganisms. It includes a raw water adjustment tank (or aeration tank) that performs an air treatment to adsorb organic substances on the agglomerates and to grow aerobic microorganisms.

  Drainage pumped up from the raw water tank is usually passed through the screen and transferred to the raw water adjustment tank, but depending on the type of drainage, etc., it may be allowed to fall naturally without passing through the screen or through the screen. It is not necessary to have a raw water tank.

  The biodegradation digester (A) includes an air diffuser (da), an aerobic microorganism fixed filter bed (ae), and an anaerobic microorganism fixed filter bed (an).

  The fixed filter bed for aerobic microorganisms (ae) is not limited as long as it is composed of a biological carrier, but aerobic microorganisms are liable to settle, microorganisms are difficult to fall off as agglomerates, and sufficient air or oxygen is supplied. The treatment water is preferably composed of a biological carrier that is easy to circulate.

  In addition, the fixed filter bed for aerobic microorganisms (ae) is composed of a biological carrier in which aerobic microorganisms are liable to settle and is supplied with sufficient air or oxygen, but is not necessarily limited to those inhabited only by aerobic microorganisms, This does not exclude cases where anaerobic microorganisms live inside the biofilm (biolayer) formed on the biocarrier. Similarly, the fixed filter bed for anaerobic microorganisms (an) is composed of a biological carrier in which anaerobic microorganisms are liable to settle and is hardly supplied with air or oxygen, but is not necessarily limited to those inhabited by only anaerobic microorganisms. This does not exclude cases where aerobic microorganisms inhabit the surface layer of the biofilm (biolayer) formed on the carrier.

  Such a preferred biological carrier includes a biological carrier comprising at least a plurality of plates intersecting each other and having a plurality of through-holes of different sizes, for example, described in Chinese Utility Model Patent CN2016686549U. Preferred examples include the biological contact material structure, the packing for gas-liquid contact device described in Japanese Patent Publication No. 47-41225, and the filter material described in FIG.

  In the fixed filter bed (ae) for aerobic microorganisms, there are no restrictions on the installation method of the biological carrier, but from the viewpoint of maintenance and inspection, etc., a porous plate (metal mesh, punching metal and expanded metal) that can freely circulate liquid and gas Etc.) or a plurality of biological carriers are preferably installed in a container formed of a porous bag (such as a net bag).

  The fixed filter bed for anaerobic microorganisms (an) is not limited as long as it is composed of a biological carrier, but it is a biological carrier that is easy for anaerobic microorganisms to settle in, the microorganisms do not easily fall off as agglomerates, and the treated water is easy to circulate. Preferably, it is configured.

  Examples of such preferable biological carriers include those similar to the preferable biological carriers for constituting the fixed filter bed (ae) for aerobic microorganisms, and the same examples are preferably exemplified.

  In the fixed filter bed for anaerobic microorganisms (an), there are no restrictions on how to install the biological carrier, but from the standpoint of maintenance and inspection, etc., porous plates that can circulate liquid freely (such as wire mesh, punching metal, and expanded metal) Alternatively, it is preferable to hold and install a plurality of biological carriers in a container formed of a porous bag (such as a net bag).

  The anaerobic microorganism fixed filter bed (an) is not limited as long as it is arranged at the lower part of the aerobic microorganism fixed filter bed (ae), that is, the aerobic microorganism fixed filter bed (ae) is closer to the water surface. It is necessary that the fixed filter bed for anaerobic microorganisms (an) be installed at a position deeper than the aerobic microorganism fixed filter bed (ae). And it is preferable not to make the fixed filter bed for anaerobic microorganisms (an) adhere to the bottom of the deepest part, but to provide a space where treated water can go in and out under the fixed filter bed for anaerobic microorganisms (an) (FIG. 1, 2). Providing such a space makes it easier for the treated water to convect (circulate) in the biodegradation digester (A).

  The fixed filter bed for aerobic microorganisms (ae) and the fixed filter bed for anaerobic microorganisms (an) may be adjacent or close to each other, but bubbles can be supplied to the fixed filter bed for aerobic microorganisms (ae). It is preferable that the fixed filter bed for anaerobic microorganisms (an) is installed at a certain distance so that bubbles are not supplied. This fixed distance can be appropriately determined depending on the degree of drainage contamination corresponding to the amount of bubbles supplied, the amount of drainage, and the like.

  The size of the fixed filter bed for aerobic microorganisms (ae) and the fixed filter bed for anaerobic microorganisms (an) can be determined as appropriate according to the degree of wastewater contamination (BOD, COD, etc.) and the amount of wastewater. The size of the filter bed (an) is preferably larger than the size of the fixed filter bed (ae) for aerobic microorganisms, and more preferably the volume of the fixed filter bed (an) for anaerobic microorganisms is The size of the bed (ae) is 1.5 to 4 times, particularly preferably the volume of the fixed filter bed for anaerobic microorganisms (an) is 1.7 times the volume of the fixed filter bed for aerobic microorganisms (ae). The size is about 3.5 times.

  If the fixed filter bed for anaerobic microorganisms (an) is disposed below the fixed filter bed for aerobic microorganisms (ae), it is easy to supply air or oxygen to the fixed filter bed for aerobic microorganisms (ae). In addition to making it difficult for air or oxygen to come into contact with the fixed filter bed for anaerobic microorganisms, gases (methane, hydrogen sulfide, etc.) generated by anaerobic microorganisms are Since it is supplied to the fixed filter bed (ae) for aerobic microorganisms at the upper part and processed by aerobic microorganisms, it is difficult for these gases to be discharged to the outside of the biological wastewater treatment apparatus, so problems such as air pollution Does not occur. In addition, agglomerates that may fall off the fixed filter bed for aerobic microorganisms (ae) (sometimes dropped due to fluctuations in the amount of drainage) and floating agglomerates are received by the fixed filter bed for anaerobic microorganisms (an). The agglomerates are treated with anaerobic microorganisms, and excess agglomerates can be digested. Thus, when the fixed filter bed for anaerobic microorganisms (an) is arranged in the lower part of the fixed filter bed for aerobic microorganisms (ae), they can maintain a mutual assistance relationship.

  A barrier wall is arranged on the fixed filter bed (ae) for aerobic microorganisms so that the wall surface is vertical, and an ascending region (ua) in which bubbles supplied from the diffuser can rise to the surface of the treated water is provided. Is preferred. By providing this rising area (ua), a falling area (da) is formed in the fixed filter bed (ae) for aerobic microorganisms (see FIG. 2). In this ascending region (ua), a biological carrier may or may not be disposed. However, when a biological carrier is disposed in the ascending region (ua), no biological carrier is disposed in the descending region (da). Thus, it is preferable to arrange the biological carrier only in either the rising region (ua) or the falling region (da).

  When a blocking wall is arranged between the bubble rising region (ua) and the water falling region (da), a part of the porous plate that may constitute the aerobic microorganism fixed filter bed (ae) is used as the blocking wall. It may be replaced, or a blocking wall may be provided overlapping the porous plate.

  It is preferable to provide an ascending region (ua) in which treated water can rise from a deep part to a shallow part by arranging a barrier wall on the fixed filter bed (an) for anaerobic microorganisms so that the wall surface is in the vertical direction. By providing this rising area (ua), a falling area (da) is formed in the fixed filter bed (an) for anaerobic microorganisms (see FIG. 2). In this ascending region (ua), a biological carrier may or may not be disposed. However, when a biological carrier is disposed in the ascending region (ua), no biological carrier is disposed in the descending region (da). Thus, it is preferable to arrange the biological carrier only in either the rising region (ua) or the falling region (da).

  When a blocking wall is arranged between the bubble rising region (ua) and the water falling region (da), a part of the porous plate that may constitute the anaerobic microorganism fixed filter bed (an) is used as the blocking wall. It may be replaced, or a blocking wall may be provided overlapping the porous plate.

  When an ascending region (ua) is provided in the fixed filter bed for aerobic microorganisms (ae) and the fixed filter bed for anaerobic microorganisms (an) so that the wall surface is vertical, the aerobic microorganisms Each barrier wall may be arranged so that the virtual extension surface of the barrier wall arranged on the fixed filter bed (ae) and the virtual extension surface of the barrier wall arranged on the fixed filter bed for anaerobic microorganisms (an) overlap. preferable. That is, the rising region (ua) formed in the fixed filter bed for anaerobic microorganisms (an) and the rising region (ua) formed in the fixed filter bed for anaerobic microorganisms (an) are continuously formed. Is preferred. When the rising region (ua) is continuously formed in this way, a continuous flow of treated water from the deepest part of the biodegradation digester (A) to the surface of the treated water is likely to be formed. The treated water can easily descend to the deepest part in the descending region (da) (see FIG. 2).

The air diffuser (da) is not limited as long as it can supply air or oxygen to the aerobic microorganisms inhabiting the fixed filter bed (ae) for aerobic microorganisms, and an aeration nozzle and / or an ejector can be used.
Note that the ejector means that the main fluid (air, water, etc.) that flows through the pipe passes through a thinner pipe regardless of the mechanical movement of the pump, etc., and the pressure decreases and the pressure decreases. Is a member that sucks in other fluids (sub-fluids; air, water, etc.) from the suction port and mixes and discharges the fluids. A liquid-liquid mixing ejector that uses a liquid (water, etc.) as a main fluid, a gas (air or oxygen, etc.) as a subfluid, a liquid (water, etc.) as a main fluid, and a liquid (water, etc.) as a subfluid There is a mixed ejector.

  The installation position of the diffuser is preferably not arranged deeper (lower part) than the fixed filter bed (an) for anaerobic microorganisms. When the diffuser is placed deeper (lower part) than the fixed filter bed for anaerobic microorganisms (an), air or oxygen is supplied to the fixed filter bed for anaerobic microorganisms (an) and the growth of anaerobic microorganisms is inhibited. It becomes easy to be done. That is, an air diffuser is arranged so that air or oxygen can be supplied only to the fixed filter bed for aerobic microorganisms (ae) without being supplied to the fixed filter bed for anaerobic microorganisms (an). Is preferred. The air diffuser not only supplies air or oxygen, but the supply can raise the treated water as the bubbles rise. Therefore, it is preferable to install so that the bubbles supplied from the diffuser can rise in the ascending region (ua).

  When an aeration nozzle is used as an air diffuser, the bubbles supplied from the aeration nozzle rise in the treated water, thereby causing convection in the treated water in the biodegradation digester (A), and the rising bubbles It is preferable to arrange an aeration nozzle so that it can rise to the surface of the treated water without being obstructed by the fixed filter bed (ae) for aerobic microorganisms, and more preferably, a blocking wall is arranged as described above to provide a rising region. (I) the ascending region (ua) formed in the fixed filter bed for an aerobic microorganism (an), (ii) the ascending region (ua) formed in the fixed filter bed for an aerobic microorganism (an) and anaerobic Aeration between the ascending region (ua) formed on the fixed filter bed for microorganisms (an) or (iii) the ascending region (ua) formed on the fixed filter bed for anaerobic microorganisms (an) It is placing the nozzle.

  When the aeration nozzle is arranged in this manner, the bubbles and the treated water rise together while the bubbles and the treated water are mixed in the ascending region (ua), and then the mixed solution of the bubbles and the treated water is produced in the descending region (da). Since it descends in contact with the fixed filter bed for aerobic microorganisms (ae), bubbles are consumed by the aerobic microorganisms, and the treated water descends while being purified, and most of the treated water is fixed by the fixed filter bed for anaerobic microorganisms ( an) and a part of the treated water is again raised in the ascending region (ua) while the bubbles and the treated water are mixed and mixed (circulation of treated water) (see FIG. 2).

  When an ejector is used as an air diffuser, a main fluid is treated water, and a gas-liquid mixed ejector using air or oxygen as a subfluid is used. The gas-liquid mixing ejector may be disposed anywhere as long as it can supply a liquid mixture of air or oxygen and treated water to the fixed filter bed for aerobic microorganisms (ae), but the fixed filter bed for anaerobic microorganisms (an) It is possible to arrange so that the mixed liquid is difficult to come into contact with, and the fixed filter bed for aerobic microorganisms (ae) and the fixed filter bed for anaerobic microorganisms (an) are not directly sprayed with the mixed liquid. preferable. That is, in the upper and / or lower part of the fixed filter bed for aerobic microorganisms (ae), the discharge direction of the discharged mixed liquid is ± 30 (preferably ± 20, more preferably ± 10 with respect to the horizontal direction or the horizontal direction. ) The gas-liquid mixing ejector is arranged so as to be in the direction of the angle (see FIGS. 3 and 4), or a rising region (ua) is provided as in the case of using an aeration nozzle, and this bubble rising region (ua ), It is preferable to arrange the gas-liquid mixing ejector so that the discharging direction of the discharged mixed liquid is upward (see FIG. 5). When the gas-liquid mixing ejector is arranged in this manner, the bubbles and the treated water rise together while being mixed in the bubble rising region (ua), and then the mixed solution of the bubbles and the treated water is preferred in the water descending region (da). Since it descends in contact with the fixed filter bed for aerobic microorganisms (ae), bubbles are consumed by aerobic microorganisms and the treated water descends while being purified, and a part of the treated water is fixed for anaerobic microorganisms (an ) And a part of the treated water is again raised in the bubble rising region (ua) while the bubbles and the treated water are mixed and mixed (circulation of treated water) (see FIG. 5).

If the aeration nozzle and / or gas-liquid ejector cannot be used to sufficiently circulate the treated water to the fixed filter bed for anaerobic microorganisms (an), the treated water can be treated using a liquid-liquid mixing ejector, a stirring blade, a circulation pump, etc. You may help circulation of. Of these, a liquid-liquid mixing ejector is preferable from the viewpoint of maintenance and inspection.
In addition, in order to promote the circulation of treated water, a barrier wall similar to the barrier wall that can be installed in the fixed filter bed for aerobic microorganisms (ae) is provided in the fixed filter bed for anaerobic microorganisms, and the circulation flow is in a certain direction. You can also prompt.

  The aeration nozzle can be used without limitation as long as it can be aerated, but an aeration board structure described in Chinese Utility Model Patent CN201668653U is preferably exemplified. Moreover, as an ejector, if a gas-liquid mixing or liquid-liquid mixing can be performed, there will be no restriction | limiting, For example, a bubbling jet nozzle and a tank mixing eductor (Spraying System Japan Co., Ltd.) can be shown.

  Regarding the diffuser (da), the fixed filter bed for aerobic microorganisms (ae), and the fixed filter bed for anaerobic microorganisms (an), the size, shape, etc. of each can be determined as appropriate according to the degree of drainage contamination, the amount of drainage, etc. .

  The biodegradation digester tank (A) may be provided with at least one tank, preferably 2-10, more preferably 3-8, particularly preferably 4-6. In addition, when installing a some biodegradation digester (A), it is preferable to install a biodegradation digester (A) in series.

  When a plurality of biodegradation digesters (A) are installed in series, among all biodegradation digesters (A), the air supply is increased as the front stage is increased, and the air is increased in the rear stage. Alternatively, it is preferable to reduce the supply amount of oxygen. This is because the organic content in the wastewater is efficiently treated in the former stage, and the agglomerates (including both floating and dropped) are efficiently treated in the latter stage.

  Although there is no restriction on the position of the outlet of the treated water to the biodegradation digester (A), the treated water is supplied from the pretreatment tank (X) or the biodegradation digester (A) to the biodegradation digester (A). It is preferable to provide the inlet for making it flow in in the upper part of a biodegradation digester (A). Moreover, it is preferable to provide the outflow port for making treated water flow out into a post-treatment tank (Y) or a biodegradation digester (A) in a back | latter stage in the deepest part of a biodegradation digester (A) (FIG. 1, FIG. 6). When the inlet is provided in the upper part of the biodegradation digester (A), the waste water first comes into contact with the fixed filter bed for aerobic microorganisms (ae), and then the fixed filter bed for anaerobic microorganisms (an). The waste water can be purified more efficiently. Moreover, when the outlet is provided at the deepest part of the biodegradation digester (A), the flow of treated water from the aerobic microorganism fixed filter bed (ae) to the anaerobic microorganism fixed filter bed (an) is promoted, Further, the waste water can be purified more efficiently, and the treated water can be more easily convected (circulated) in the biodegradation digester (A).

It is preferable to install a post-treatment tank (Y) in the biological wastewater treatment apparatus of the present invention.
The post-treatment tank (Y) includes an agglomeration separation tank (B) and an inorganic substance separation tank (C).

  The agglomeration separation tank (B) is a separation tank for separating the agglomerate and the treated water, and includes an inlet for allowing treated water from the biodegradation digester (A) to flow in, It has a return port for returning to the treatment tank (X) and a discharge port for discharging the treated water or discharging it to another post-treatment tank, and does not have other outflow ports. That is, the agglomeration separation tank does not have an outlet for discharging excess agglomerates (or excess sludge) to the outside of the biological wastewater treatment apparatus.

  As a return destination of the agglomerate, a raw water adjustment tank is preferable, but it may also be returned to the biodegradation digester tank (A).

In the biological wastewater treatment apparatus of the present invention, microorganisms (aerobic microorganisms, anaerobic microorganisms) ingest organic matter in the wastewater, and discharge gas (carbon dioxide, methane, ammonia, hydrogen sulfide, etc.) and water. However, among these gases, the gas (methane, ammonia, hydrogen sulfide, etc.) emitted by anaerobic microorganisms is re-ingested by aerobic microorganisms and converted into carbon dioxide and water, and its own cells. The organic component contained in the wastewater is converted into water and carbon dioxide, which are released to the outside of the biological wastewater treatment apparatus.
However, in addition to these, microorganisms ingest and discharge inorganic substances (nitrate ions, sulfate ions, phosphate ions, metal ions, and compounds composed of these) (or exist without being ingested). Some inorganic substances (nitrate ions, sulfate ions, etc.) may be converted to ammonia, nitrogen, hydrogen sulfide, etc. by returning the agglomerates and food chains, but metal ions (In particular, heavy metal ions), phosphate ions, and the like are released to the outside of the biological waste water treatment apparatus as they are contained in the discharged water (or treated water).
Therefore, the biological wastewater treatment apparatus of the present invention is provided with an inorganic substance separation tank (C) for separating and removing metal ions (particularly heavy metal ions) and phosphate ions from treated water immediately before being discharged. It is preferable.

  An inorganic substance separation tank (C) is installed in the back | latter stage of an agglomeration separation tank (B), and is for isolate | separating an inorganic substance and treated water. In particular, it separates heavy metal atoms and phosphorus atoms that would be problematic if released while contained in the effluent water, and discharges only treated water from which these atoms have been removed.

  The inorganic substance separation tank (C) is preferably filled with an inorganic substance separating material capable of separating and removing metal ions (particularly heavy metal ions) and phosphate ions from treated water immediately before being discharged. Inorganic substances may be removed.

  As the inorganic substance separating material, activated carbon, zeolite, diatomaceous earth, activated clay, or the like may be used, but a charcoal / metal porous composite constituted by metal particles and charcoal particles being in contact with each other and being porous is preferable.

  Examples of such a charcoal / metal porous composite include a water treatment charcoal-metal composite described in JP2011-25160, and a TERRAST series (charcoal / metal porous composite; Aoyama Ecosystem Co., Ltd.). ) Can be preferably used.

  In the charcoal / metal porous composite, it is considered that the metal and charcoal are in contact with each other to form a battery, and in the water, the metal elutes, and this metal supplements the inorganic substance and is considered to coagulate and precipitate. It is done. Therefore, the metal of the charcoal / metal porous composite can be appropriately determined depending on the type of inorganic substance to be separated, but aluminum and iron are preferable because many kinds of inorganic substances can be coagulated and precipitated.

  The biological wastewater treatment apparatus of the present invention can be purified regardless of the type, concentration, amount, etc., as long as the wastewater contains organic components and can be biologically purified. For example, it can be applied to domestic wastewater, household wastewater, manure wastewater, factory wastewater, manufacturing wastewater generated in the middle of the manufacturing process, and the like.

<Example 1>
Stainless steel expanded metal (SW36mm, LW101.6mm) side wall and bottom, cylindrical outer wall with a diameter of 210mm x height 500mm in the center of a rectangular parallelepiped of width 740mm x depth 740mm x height 500mm 3) is provided so that the wall surface is in the vertical direction, and the inside is filled with a biological contact material structure described in Chinese Utility Model Patent CN2016686549U as a biological carrier, and a fixed filter bed for aerobic microorganisms (1) Was prepared.

  A cylindrical barrier wall with a diameter of 210 mm and a height of 1000 mm at the center of a cube of stainless steel expanded metal (SW 36 mm, LW 101.6 mm), having a side and bottom surface and having an outer dimension of width 740 mm × depth 740 mm × height 1000 mm. 3) is provided so that the wall surface is in the vertical direction, and the inside is filled with a biological contact material structure described in Chinese Utility Model Patent CN2016686549U as a biological carrier, and the fixed filter bed for anaerobic microorganisms (2) Was prepared.

  For anaerobic microorganisms such that the bottom surface of the fixed filter bed for anaerobic microorganisms (2) is 200 mm from the bottom surface of the rectangular parallelepiped stainless steel tank in a rectangular parallelepiped stainless steel tank with an internal size of width 750 mm × depth 750 mm × height 2200 mm Four fixed angle bars for holding the fixed filter bed (2) are attached, and the fixed angle bar holds the fixed filter bed for anaerobic microorganisms (2), and the fixed filter bed for aerobic microorganisms (1 The fixed filter bed for aerobic microorganisms (1) was suspended from the upper end of the rectangular parallelepiped stainless steel tank so that the upper surface of) was 200 mm from the upper end of the rectangular parallelepiped stainless steel tank.

  Anaerobic microorganisms so that bubbles can rise in the ascending region (ua) surrounded by the cylindrical barrier (3) of the fixed filter bed for aerobic microorganisms (1) and the fixed filter bed for anaerobic microorganisms (2) An aeration nozzle (4; an aeration panel structure described in Chinese Utility Model Patent CN2016686553U) is installed in the center of the cylindrical barrier wall (3) of the fixed filter bed (2), and this is connected to the air transfer pipe. Connected.

  An inlet (7) for inflow of treated water is provided near the upper end of the rectangular parallelepiped stainless steel tank, and an outlet (8) for outflow of treated water is provided near the bottom of the rectangular parallelepiped stainless steel tank for biodegradation digestion A tank (A) was prepared (see FIG. 6). Similarly, a total of 4 biodegradation digesters (A) were prepared.

  A receiving port (12) for receiving drainage is provided in the vicinity of the upper end of a rectangular parallelepiped stainless steel tank having a width of 400 mm, a depth of 750 mm, and a height of 2200 mm. A raw water tank (X1) was prepared with a stainless steel tank height of about 1000 mm.

  Installed in the aeration nozzle (4; aeration board structure described in Chinese Utility Model Patent CN16166653U) in the vicinity of the bottom center of a rectangular parallelepiped stainless steel tank of width 400mm x depth 750mm x height 2200mm. An inlet (7) for connecting the transfer pipe and allowing the drainage to flow in is provided near the upper end of the rectangular parallelepiped stainless steel tank, and an outlet (8) for allowing the treated water to flow out is provided near the bottom of the rectangular parallelepiped stainless steel tank. The raw water adjustment tank (X2) was prepared by providing the return mass inlet (11) for receiving the return mass from the mass separation tank.

  A rectangular pyramid with a bottom of 400mm x 400mm x 500mm in height is provided at the bottom of a rectangular parallelepiped stainless steel tank with internal dimensions of width 400mm x depth 400mm x height 2200mm. An outlet (10) for returning and collecting agglomerates is provided in the section, and an inlet (7) for allowing the treated water to flow in is provided in the vicinity of 1000 mm from the upper end of the rectangular parallelepiped stainless steel tank. 8) was provided near the upper end of the rectangular parallelepiped stainless steel tank to prepare an agglomeration separation tank (B).

  An inflow port (7) for inflowing treated water is provided near the center of the bottom of a rectangular parallelepiped stainless steel tank (C1) having a width of 400 mm × depth of 400 mm × height of 2200 mm, and the treated water is adjacent to the tank. An outflow port (8) for flowing out into a cylindrical stainless steel tank (C2; width 400 mm × depth 400 mm × height 2200 mm in internal dimensions) is provided near the upper end of the rectangular parallelepiped stainless steel tank (C1). A rectangular pyramid with a bottom of 400 mm x 400 mm x 500 mm in height is provided at the bottom of C2) so that the bottom is on the top and the top is on the bottom. An inflow port (7) for allowing treated water to flow in from the outflow port (8) of (C1) is provided near a height of 1000 mm of the rectangular parallelepiped stainless steel tank (C2). A discharge port (13) for discharging treated water is provided in the vicinity of the upper end of the tank (C2), and the carbon / metal porous composite (TERRAST Fe; iron and charcoal) is further provided in the rectangular parallelepiped stainless steel tank (C1). A porous composite, Aoyama Ecosystem Co., Ltd., packed in a polyethylene mesh bag is loaded, the inside of the rectangular parallelepiped stainless steel tank (C1) is filled with a carbon metal porous composite, and an inorganic substance separation tank ( C) was prepared.

  Four biodegradation digesters (A) are arranged in series, the raw water adjustment tank (X2) is placed in front of the first biodegradation digester (A), and the raw water tank (X1) is placed in front of this. In addition, the agglomeration separation tank (B) is arranged after the last stage biodegradation digestion tank (A), and then the inorganic substance separation tank (C) is installed so that each tank is in series. Connect the outlet (8) and inlet (7), connect the blower to the air transfer pipe, return the agglomerate separation tank (B), return the agglomerate (10), and return the raw water adjustment tank A biological wastewater treatment apparatus of the present invention was prepared by connecting the agglomerate inlet (11) with a pipe and, if necessary, providing a transfer pump in the middle of each pipe (see FIG. 1).

Using the biological wastewater treatment apparatus of the present invention, VOC removal scrubber wastewater (about 9000 liters / day) in a chemical factory is treated, and JIS K0102: 2008 “21. Biochemical oxygen consumption (BOD), 32. Accepted wastewater and discharge according to “Dissolved oxygen (32.3 diaphragm electrode method)”, “17. Oxygen consumption by potassium permanganate at 100 ° C. (COD _Mn )”, “14.2 Total evaporation residue” For water, BOD, COD and total evaporation residue were measured and the results are shown in Table 1 (units are in ppm).
In addition, after 97 days of waste water treatment, generation of surplus agglomerates (or surplus sludge) was not observed, and the amount of return agglomerates was also small.

  The VOC-removal scrubber wastewater is stored in the scrubber tank and reused by circulation and replaced with fresh water at a rate of once a week. It was tested to do. Further, after 57 days to 97 days, the total evaporation residue was not measured.

<Example 2>
The coating line pretreatment waste water (330 liters / day) was treated for 3 days using an apparatus 1/2 the size of the biological waste water treatment apparatus prepared in Example 1, and after 3 days, JIS K0102: 2008, “45. Total nitrogen, 45.2 UV spectrophotometry”, “46. Total phosphorus, 46.3.2 Nitric acid-perchloric acid decomposition method”, “53. Zinc, 53.3 ICP emission spectroscopy” In accordance with “59. Nickel, 59.3 ICP Emission Spectroscopy”, “34. Fluorine, 34.1 Lanthanum-Alizarin Complexone Spectrophotometry”, the total amount of nitrogen, total phosphorus, Zinc, nickel and fluorine were measured and the results are shown in Table 2 (units are in ppm).
In addition, after the waste water treatment on the 3rd, generation of surplus agglomerates (or surplus sludge) and return agglomerates were not observed.

<Example 3>
Device of 1/2 size of biological waste water treatment device prepared in Example 1 (However, the inorganic substance separation tank (C) is not provided, and the outlet of the treated water in the agglomeration separation tank (B) is discharged. Was discharged from here as a mouth), and the waste water from the soap factory (1000 liters / day) was treated for 22 days. After 22 days, JIS K0102: 2008 “21. Biochemical oxygen consumption (BOD), 32. “Dissolved oxygen (32.3 diaphragm electrode method)” and “Environment Agency Notification No. 64, Annex 4 (hexane extractant; acidify the sample to hydrochloric acid with a pH of 4 or less, extract oil in the sample with hexane, about 80 The method of measuring the mass of the substance remaining by volatilizing hexane at ℃, the residue includes mineral oil, animal and vegetable oils and other non-volatile substances. BOD and Nor The content of extract of malhexane was measured, and these results are shown in Table 3 (all units are ppm).
Moreover, after the waste water treatment on the 22nd, generation of surplus agglomerates (or surplus sludge) and return agglomerates was not observed.

<Example 4>
Device of 1/2 size of biological waste water treatment device prepared in Example 1 (However, the inorganic substance separation tank (C) is not provided, and the outlet of the treated water in the agglomeration separation tank (B) is discharged. The wood processing factory effluent (1000 liters / day) was treated for 24 days using this as a mouth.) After 24 days, “21. Biochemical oxygen consumption (BOD) of JIS K0102: 2008, 32. “Dissolved oxygen (32.3 diaphragm electrode method)”, “17. Oxygen consumption by potassium permanganate at 100 ° C. (COD _Mn )” and “Environment Agency Notification No. 64 Annex 4 (Hexane extract)” Based on the results, the BOD, COD _Mn, and normal hexane extractable substance contents were measured for the receiving waste water and the discharge water, and the results are shown in Table 4 (all units are ppm).
Moreover, after the waste water treatment on the 24th, generation of surplus agglomerates (or surplus sludge) and return agglomerates was not observed.

  As described above, the biological wastewater treatment apparatus of the present invention is capable of efficiently purifying surplus agglomerates (or surplus sludge) even if it is wastewater from a chemical factory containing a hardly decomposable substance. The occurrence of no occurrence was observed, and there was no or little amount of return mass.

1 Fixed filter bed for aerobic microorganisms (ae)
2 Fixed filter bed for anaerobic microorganisms (an)
3 Blocking Wall 4 Aeration Nozzle 5 Gas-Liquid Mixing Ejector 6 Surface of Treated Water 7 Inlet for Treated Water 8 Outlet for Treated Water 9 Intake Port for Inorganic Substances 10 Inlet Port for Returning Agglomerates 11 Return Inlet Mass Inlet 12 Accepting Wastewater Mouth 13 Outlet for treated water

ua rising area da falling area X1 pretreatment tank (raw water tank)
X2 Pretreatment tank (raw water adjustment tank)
A Biodegradation digester B Bump separation tank C Inorganic substance separation tank

Claims (12)

A pretreatment tank (X);
An aeration tool (da), a fixed filter bed for aerobic microorganisms (ae) and at least one tank of a biodegradation digester tank (A) provided with a fixed filter bed for anaerobic microorganisms (an);
A biological wastewater treatment apparatus, comprising a fixed filter bed for anaerobic microorganisms (an) below a fixed filter bed for aerobic microorganisms (ae). A plurality of biodegradation digesters (A) are installed in series,
The biological waste water treatment apparatus according to claim 1, wherein the number of installation is 2 to 10. An inlet for allowing treated water to flow into the biodegradation digester (A) from the pretreatment tank (X) or the biodegradation digester (A) in the previous stage is provided at the top of the biodegradation digester (A),
The biological body according to claim 1 or 2, wherein an outlet for allowing the treated water to flow out to the post-treatment tank (Y) or the biodegradation digester (A) in the latter stage is provided at the deepest part of the biodegradation digester (A). Wastewater treatment equipment. An aerobic microorganism fixed filter bed (ae) is provided with an ascending region (ua) in which a barrier wall is arranged in a vertical direction so that bubbles supplied from the diffuser can rise to the surface of the treated water. Item 4. The biological wastewater treatment apparatus according to any one of Items 1 to 3. Any one of Claims 1-4 which arrange | positions the barrier | blocking wall in the fixed filter bed (an) for anaerobic microorganisms so that a wall surface may become a perpendicular direction, and provides the raise area | region (ua) which a process water can rise from a deep part to a shallow part A biological wastewater treatment apparatus according to claim 1. The biological waste water treatment apparatus according to claim 4 or 5, wherein a diffuser is disposed in the ascending region (ua). The biological waste water treatment apparatus according to claim 1, wherein the diffuser is an aeration nozzle and / or an ejector. The biological carrier constituting the fixed filter bed for aerobic microorganisms (ae) and the fixed filter bed for anaerobic microorganisms (an) includes at least a plurality of plates intersecting each other, and a plurality of through-holes having different sizes are provided on the plates. The biological waste water treatment apparatus according to any one of claims 1 to 7. As a post-treatment tank (Y), a separation tank for separating agglomerates and treated water,
Inlet for inflowing treated water from the biodegradation digester (A), return port for returning the agglomerate to the pretreatment tank (X), and discharging the treated water to another post-treatment tank The biological waste water treatment apparatus in any one of Claims 1-8 which installs the agglomeration separation tank (B) which has a discharge port for doing and does not have another outflow inlet. The inorganic substance separation tank (C) for separating an inorganic substance and treated water is installed as a post-treatment tank (Y) in the subsequent stage of the agglomeration separation tank (B). Biological wastewater treatment equipment. The biological waste water treatment apparatus according to claim 10, wherein the inorganic substance separation tank (C) is filled with a charcoal / metal porous composite composed of porous metal particles and charcoal particles. The biological wastewater treatment apparatus according to claim 11, wherein the metal is aluminum and / or iron.

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