JP2003053360A - Combined type sewage treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the flow resistance of sewage to contact materials and to enhance contact efficiency by making it possible to realize the environment approximate to a laminar state with respect to the sewage circulation in a contact aerator. SOLUTION: The contact materials 21 installed in the contact aerator are constituted by carrying and supporting porous ceramic particles 23 on one or both surfaces of fiber reinforced plastic(FRP) plates 22 bent and formed to a bellows shape. At this time, the contact materials are formed by spraying the porous ceramic particles 23 of about 1 mm in diameter on one surface just prior to hardening of the fiber reinforced plastic(FRP) plates 22 of about 1 to 1.2 mm at about 100 to 400 g per square meter. A plurality of the contact materials 21 are vertically arranged within the contact aerator in such a manner that the peaks and valleys of the bellows surfaces are aligned to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined treatment septic tank for purifying organic substances contained in organic wastewater such as human waste and gray water.

[0002]

2. Description of the Related Art Conventionally, in a combined treatment septic tank comprising a precipitation separation chamber, a contact aeration chamber, a precipitation chamber and a disinfection chamber, the contact aeration chamber is filled with a porous contact material. Deposition, denitrification, and BO removal of sewage due to aerobic microorganisms grown on the surface of this contact material and anaerobic microorganisms grown in the micropores of the contact material by stacking multiple contact material casings.
D, de-SS, de-ammonia, etc. are processed. Further, an air diffuser is arranged in a gap in the center of the pair of contact materials arranged opposite to each other in the contact aeration chamber, and one backwash pipe is arranged on each side of the air diffuser so as to be parallel to the air diffuser. ing. Further, conventionally, a contact material has been proposed in which a ceramic sheet is attached to both surfaces of a resin layer made of a fiber reinforced plastic material.

[0003]

However, in such a conventionally proposed combined treatment septic tank, a plurality of contact material casings filled with a porous contact material are stacked in the contact aeration chamber, so that the sewage The resistance to circulation increases and turbulent flow is generated, so that the contact efficiency with the contact material decreases. Further, in the contact material formed by sticking the ceramic sheets on both surfaces of the resin layer made of the fiber reinforced plastic material, the environment for the production of the microbial membrane is limited only to the sheet surface area. Is extremely low. Moreover, when the contact material is used for a long period of time, there is a possibility that the portion where the ceramic sheet is adhered to the resin layer may peel off. Further, conventionally, one backwash pipe is arranged on each side of the air diffusing pipe so as to be parallel to the air diffusing pipe. Therefore, when cleaning the contact material, only one backwash pipe is used. There was a problem that it was insufficient to remove the dirt attached to the.

Therefore, the present invention was created in view of the above existing circumstances, and realizes an environment close to a laminar flow state in which turbulent flow is eliminated with respect to wastewater circulation in a contact aeration tank. This will reduce the flow resistance of sewage to the contact material and improve the contact efficiency, as well as save space in the lateral direction during embedded installation, and improve the environment for growing microbial membranes on the contact material. Further, it is an object of the present invention to provide a combined treatment septic tank in which the backwash pipe can be improved so as to efficiently remove the dirt attached to the contact material.

[0005]

In order to achieve the above-mentioned object, in the present invention, a precipitation separation tank (2a, 2b) in which an anaerobic microorganism is grown and an aerobic microorganism are grown. The contact material 21 is vertically arranged, and the diffusing pipe 13 and the backwash pipe 14 connected to the air lift pump 12 are connected to the contact material 2
In a combined treatment septic tank comprising a contact aeration tank 3 arranged at the bottom, a settling tank 4, and a disinfection tank 5, each of which is partitioned and arranged via a partition wall, a contact material installed in the contact aeration tank 3. Reference numeral 21 denotes a fiber-reinforced plastic (FRP) plate 22 bent in a bellows shape, and supporting porous ceramic particles 23 on one or both surfaces thereof.
The contact material 21 has about 1 to 1.2 mm of porous ceramic particles 23 having a diameter of about 1 mm on one surface immediately before curing of a fiber reinforced plastic (FRP) plate 22 of about 100 to 400 g per square meter. It can be applied by spraying. A plurality of the contact materials 21 may be vertically arranged in the contact material mount 24 so that the peaks and the valleys of the bellows surface are aligned with each other. The backwash pipe 14
Is an air diffusing tube 1 arranged at the center bottom of the pair of contact material mounts 24.
On both sides of 3, a plurality of pipes along the longitudinal direction are formed in a generally rectangular ring shape so as to be horizontally arranged in a parallel state. Can be perforated at a predetermined interval. The contact aeration tank 3 is formed in a substantially vertically long hexagonal shape or a barrel shape in which the center of both sides is slightly outwardly protruded in a substantially V shape when viewed from the front and the vertical width is larger than the horizontal width. There can be something.

In the combined treatment septic tank according to the present invention configured as described above, the porous ceramic particles 23 are supported on one or both sides of the fiber reinforced plastic (FRP) plate 22 bent in a bellows shape. The contact material 21 vertically arranged in the contact aeration layer 3 makes it possible to improve the environment for the growth of the microbial film on the contact material 21, and the contact material 21 itself vertically arranged has a bellows shape. Since it is present, the contact area of sewage can be increased and the degree of reinforcement can also be improved. Porous ceramic particles 23 having a diameter of about 1 mm are sprayed on one surface of the fiber-reinforced plastic (FRP) plate 22 having a diameter of about 1 to 1.2 mm immediately before curing by spraying about 100 to 400 g per square meter to be attached. The contact material 21 thus formed forms a protrusion on the surface of the contact material 21 to increase the surface area, thereby promoting generation of a microbial film, and also improving the degree of reinforcement of the contact material 21 itself. A plurality of contact materials 21 are vertically arranged in the contact material mount 24 so that the peaks and the valleys of the bellows surface are aligned with each other. The contact material 21 smoothly circulates the sewage in the vertical direction. Moreover, since the flow resistance is reduced, the contact material 2
(1) The contact of sewage with the surface is evenly performed to improve the sewage treatment capacity. A plurality of tubular bodies along the longitudinal direction are formed in a generally rectangular ring shape so as to be horizontally arranged in a parallel state,
The backwash pipe 14 having a plurality of air ejection holes 14a formed at predetermined intervals on the left and right side surfaces efficiently removes the dirt attached to the contact material 21. The contact aeration tank 3 is formed in a vertically long hexagonal shape or a barrel shape whose vertical width is larger than the horizontal width. The flow resistance of the sewage to the material 21 is reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
1 is a buried unit type combined treatment septic tank main body for purifying organic substances contained in organic wastewater, wherein the combined treatment septic tank main body 1 has anaerobic microorganisms grown therein as shown in FIGS. The sedimentation first chamber 2a, the sedimentation second chamber 2b, the contact aeration tank 3 in which aerobic microorganisms are grown, the sedimentation tank 4, and the disinfection tank 5 are partitioned and arranged through a partition wall, respectively. There is.

As shown in FIG. 3, the outer shape of the main body 1 of the combined treatment septic tank is substantially vertically long hexagonal or barrel-shaped as viewed from the front, and the vertical width thereof is larger than the horizontal width.
Etc., and has a shape in which the center of the side surface protrudes slightly outwards in a V shape, thereby eliminating the turbulent flow with respect to the wastewater circulation in the contact aeration tank 3. The laminar flow state is approximated to reduce the flow resistance of the dirty water to the contact material 21 and improve the contact efficiency, and at the same time, it is possible to save the space in the lateral width direction at the time of installation.

On the upper side of the outer wall of the sedimentation first chamber 2a, an inflow pipe 6 for introducing organic wastewater such as human waste and gray water is provided with an inflow baffle 7 arranged toward the bottom of the sedimentation first chamber 2a. Is connected through. Precipitation separation first chamber 2
On the side of the partition wall that separates a and the precipitation separation second chamber 2b, the advection baffle 8 is arranged toward the bottom on the side exposed to the precipitation separation first chamber 2a, and the side exposed to the adjacent precipitation separation second chamber 2b. An advection baffle 9 is arranged in the bottom of the column so as to communicate with the advection baffle 8.

The sedimentation separation first chamber 2a and the sedimentation separation second chamber 2b are communicated with each other through an opening on the upper side of the partition wall, and the wastewater supernatant flowing into the sedimentation separation first chamber 2a is sedimented and separated. It is designed to flow into the second chamber 2b. Further, the contact aeration tank 3 and the settling tank 4 are communicated with each other through an opening 4A below the partition wall so that the water treated in the contact aeration tank 3 flows into the settling tank 4. . Moreover, the settling tank 4 has a hopper shape in which the diameter is gradually reduced downward, and sludge is guided by the settling tank 4 and flows into the bottom of the contact aeration layer 3 through the opening 4A.

As shown in FIGS. 3 and 4, a pair of partition walls partitioning the second settling separation chamber 2b and the contact aeration tank 3 are exposed at a predetermined interval on the side exposed to the second settling separation chamber 2b. An advection baffle 10 is arranged, and a sludge extraction pipe 11 is arranged on the side exposed to the contact aeration tank 3. In the contact aeration tank 3, a pair of contact material pedestals 24, each of which has a contact material 21 having a substantially vertical pentagon shape to be described later, are mounted, and a pair of contact material pedestals 24 connect the sediment separation second chamber 2b and the sedimentation tank 4 in a direction perpendicular to the wastewater inflow path. It is arranged opposite to.

As shown in FIG. 8, the contact member 21 has a diameter of about 1 mm on one or both sides of a fiber reinforced plastic (FRP) plate 22 which is formed into a bellows shape and has a plate thickness of about 1 to 1.2 mm. About 100 to 400 g per 1 square meter of the porous ceramics-based particles 23 are spread and attached, and when the contact material 21 is processed and formed, the surface (one surface) of the fiber reinforced plastic (FRP) plate 22 is Immediately before hardening, the porous ceramic particles 23 are evenly dispersed and prepared. The reason for dispersing such porous ceramic particles 23 is to promote the generation of the microbial film by forming protrusions on the surface of the contact material 21 to increase the surface area. Aerobic microorganisms grow on the fine pores and the surface of the porous ceramic particles 23 supported on the fiber reinforced plastic (FRP) plate 22.

In the present embodiment, the bellows surface of the contact material 21 is formed in a triangular zigzag type in cross section, and a plurality of contact materials 21 are arranged in the contact material mount 24 so that the peaks and valleys of the bellows surface are formed. The contact members 2 are vertically arranged so that they are aligned with each other, and the upper and lower parts are riveted with the pressing plates 24A.
1 is arranged (see FIG. 7). In addition, it may be formed on a bellows surface having a rectangular or trapezoidal zigzag type (see FIG. 9A) or a corrugated type (see FIG. 9B).

As shown in FIG. 5, an air lift pump 12 is disposed on the side of the partition wall that separates the contact aeration tank 3 and the precipitation tank 4 from the side exposed to the contact aeration tank 3. The air diffusing pipe 13 arranged between the pair of facing contact material mounts 24 is communicated with the air diffusing valve 13A or the like.
The air lift pump 12 also includes a pair of contact material mounts 24.
At the bottom of the air diffuser 13 and on both sides of the air diffuser 13.
The backwash pipe 14 arranged in parallel with the backwash pipe 14 is communicated with the backwash valve 14A, the air lift adjusting valve 14B, the air relief valve 14C, the air relief pipe 14D, and the like. As shown in FIG. 6, the backwash pipe 14 is formed into a substantially rectangular ring shape so that three pipe bodies along the longitudinal direction are horizontally arranged at the bottom of the pair of contact material mounts 24 in parallel. A plurality of air ejection holes 14a are formed in the left and right side surfaces of the backwash pipe 14 at predetermined intervals. The backwash pipe 14 is used when the contact material 21 is washed, and closes the air diffuser valve 13A and the like and backwash valve 14
It is performed by opening valve A and the like.

The air diffuser 13 is connected via a sludge measuring device 15
It is connected to the sludge transfer pipe 16 arranged with a slight gradient toward the sedimentation separation first chamber 2a, and the sludge transfer pipe 16 crosses the upper part of the sedimentation separation second chamber 2b and is placed on the sedimentation separation first chamber 2a. It faces the upper end side of the inflow baffle 7 that faces the bottom of the first settling separation chamber 2a.

In the upper center of the settling tank 4, a scum baffle
A disinfection tank 5 comprising a disinfection cylinder, disinfection partition wall, etc. loaded with a water collection toy, overflow cough, chlorine, etc. is arranged, and the supernatant of the treated water that has flowed into the settling tank 4 is a scum baffle / water collection toy. -It is designed to flow into the disinfection tank 5 through the overflow.
Further, a discharge pipe 17 is arranged at a side wall portion of the disinfection tank 5 located on the water surface in order to overflow the supernatant of the disinfection tank 5 into a river or the like.

On the upper surface of the combined treatment septic tank main body 1, a manhole 18A communicating with the precipitation separation first chamber 2a, a manhole 18B communicating with the precipitation separation second chamber 2b, and a manhole 18C communicating with the contact aeration tank 3 and the precipitation tank 4. Are formed respectively. Further, the manhole 18A side is provided with an odor vent 19 for discharging the odor inside and keeping the inside at a constant atmospheric pressure.

Next, an example of the operation of the embodiment configured as described above will be described. As shown in FIG. 2, the discharged organic sewage such as human waste and gray water is first introduced into the precipitation separation first chamber 2a of the combined treatment septic tank main body 1 through the inflow pipe 6, and is contained in the sewage here. The relatively large suspended solids are precipitated, and the anaerobic microorganisms growing in the precipitation separation first chamber 2a are dephosphorized, denitrified, de-BOD, de-S
S, deammonification, etc. are processed.

Next, the supernatant of the sewage treated in the sedimentation separation first chamber 2a flows into the sedimentation separation second chamber 2b via the advection baffle 8 and advection baffle 9 and is further treated there by anaerobic microorganisms. The sludge floating in the sedimentation separation second chamber 2b is drawn out to the center of the bottom inside the contact aeration layer 3 via the sludge drawing pipe 11, and is floated through the contact material 21 by the air pressure from the diffuser pipe 13. During this time, air is absorbed in the dirty water, and as the air floats, circulating flows in opposite directions are generated in the dirty water.

At this time, the organic matter contained in the wastewater is circulated in the contact aeration layer 3 to be uniformly dispersed, and the contact material 2
No. 1 is oxidatively decomposed by the aerobic microbial membrane produced by the porous ceramic particles 23 carried on the fiber reinforced plastic (FRP) plate 22. Contact material 2 at this time
No. 1 is prepared by evenly dispersing the porous ceramic particles 23 immediately before the surface (one side) of the fiber reinforced plastic (FRP) plate 22 is hardened, and projections are formed on the surface of the contact material 21 to form a surface area. Is increased, the micropores of the porous ceramic particles 23 supported on the fiber reinforced plastic (FRP) plate 22 are formed, and an environment where aerobic microorganisms easily grow is formed on the surface. There is. The water treated in the contact aeration layer 3 flows into the next settling layer 4 through the opening 4A below the partition wall, and a small amount of sludge contained in the water settles on the inner bottom of the settling layer 4. To be done.

The sludge and the treated water that have flowed into the bottom of the contact aeration layer 3 are returned by the air lift pump 12 to the sedimentation first chamber 2a through the sludge transfer pipe 16, and the same treatment steps as described above are repeated thereafter. . And the sediment layer 4
The supernatant of the treated water that has flowed into the tank is discharged into the disinfecting layer 5, is sterilized with chlorine, and is then discharged to a river or the like through the discharge pipe 17.

[0022]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is possible to realize an environment close to a laminar flow state in which turbulent flow is eliminated with respect to the circulation of waste water in the contact aeration tank, and the contact material is In addition to reducing the flow resistance of sewage and improving the contact efficiency, it is also possible to save space in the lateral direction when installing underground, and it is possible to improve the environment for growing microbial membranes on the contact material It is possible to provide a combined treatment septic tank in which the backwash pipe can be improved so that the attached dirt can be efficiently removed.

That is, in the present invention, the precipitation separation tanks (2a, 2b) in which the anaerobic microorganisms are grown and the contact material 21 in which the aerobic microorganisms are grown are vertically arranged and connected to the air lift pump 12. Air diffuser 13 and backwash tube 1
A contact aeration tank 3 having 4 arranged at the bottom of the contact material 21, a settling tank 4, and a disinfecting tank 5 are installed in the contact aeration tank 3 in a combined treatment septic tank comprising partition walls. This is because the contact material 21 is formed by supporting the porous ceramic particles 23 on one side or both sides of a fiber reinforced plastic (FRP) plate 22 bent in a bellows shape. It is possible to improve the environment for the growth of the microbial film at the same time, and since the contact material 21 itself standing vertically has a bellows shape, it is possible to increase the contact area of sewage and also improve the degree of reinforcement. be able to.

The contact material 21 has porous ceramic particles 23 having a diameter of about 1 mm on one side immediately before curing of a fiber reinforced plastic (FRP) plate 22 having a diameter of about 1 to 1.2 mm and a diameter of about 100 per square meter. Since about 400g is sprayed and formed, the protrusions are formed on the surface of the contact material 21 to increase the surface area, which can promote the generation of the microbial film, and the reinforcement degree of the contact material 21 itself is improved. Can be made.

Since a plurality of the contact materials 21 are vertically arranged in the contact material mount 24 so that the peaks and the valleys of the bellows surface are aligned with each other, the sewage circulation along the vertical direction. Since the flow is performed smoothly and the flow resistance is reduced, the contact of the sewage with the surface of the contact material 21 is evenly performed, and the sewage treatment capacity can be improved.

The backwash pipe 14 includes a pair of contact material mounts 24.
On both sides of the air diffusing pipe 13 arranged at the center bottom of the back washing pipe 14, a plurality of tubular bodies along the longitudinal direction are horizontally arranged in parallel and are formed in a substantially rectangular ring shape. Since a plurality of air ejection holes 14a are formed at a predetermined interval in this, it is possible to efficiently remove the dirt attached to the contact material 21.

The contact aeration tank 3 has a substantially vertically-elongated hexagonal shape or a barrel shape in which the center of both sides is slightly outwardly protruded in a substantially V shape when viewed from the front and the vertical width is larger than the horizontal width. Since the sewage is formed, the sewage circulation inside can be made to be close to a laminar flow state in which turbulent flow is eliminated, and the flow resistance of the sewage to the contact material 21 can be reduced.

[Brief description of drawings]

FIG. 1 is a flowchart illustrating a wastewater flow channel according to an embodiment of the present invention.

FIG. 2 is a sectional view of the combined treatment septic tank as viewed from the side.

FIG. 3 is a sectional view of the combined treatment septic tank as seen from the front.

FIG. 4 is a schematic plan view around the contact material of the contact aeration layer.

FIG. 5 is a front view of the contact aeration layer with the contact material removed.

FIG. 6 is a schematic plan view of a state in which the contact material of the contact aeration layer is also removed.

FIG. 7 is a perspective view of the contact material mount.

FIG. 8 is likewise an overall perspective view of a contact member.

9A and 9B show another example of the contact material, wherein FIG. 9A is a cross-sectional view of a trapezoidal zigzag type contact material, and FIG. 9B is a cross-sectional view of a corrugated contact material.

[Explanation of symbols]

1 merger processing septic tank body 2a Precipitation separation first chamber 2b Precipitation separation second chamber 3 Contact aeration layer 4 sedimentation layer 4A open part 5 disinfection layer 6 inflow pipe 7 Inflow baffle 8, 9, 10 advection baffle 11 Sludge extraction pipe 12 Air lift pump 13 Air diffuser 14 Backwash pipe 15 Sludge metering device 16 Sludge transfer pipe 17 Discharge pipe 18A, 18B, 18C manhole 19 Odor mouth 21 Contact material 22 Fiber reinforced plastic (FRP) plate 23 Porous ceramic particles 24 Contact material stand

Claims (6)

[Claims] 1. A settling / separation tank in which anaerobic microorganisms are grown, and a diffusing pipe and a backwash pipe in which a contact material in which aerobic microorganisms are grown are vertically arranged and connected to an air lift pump are provided at the bottom of the contact material. In the combined treatment septic tank in which the contact aeration tank and the contact aeration tank are arranged by partition walls, the contact material installed in the contact aeration tank is a fiber-reinforced plastic (FRP) bent into a bellows shape. A combined treatment septic tank characterized in that one or both sides of a plate carry porous ceramic particles. 2. The contact material comprises porous ceramic particles having a diameter of about 1 mm on one side immediately before hardening of a fiber reinforced plastic (FRP) plate having a diameter of about 1 to 1.2 mm, and the contact material is about 100 to about 100 per square meter. The combined treatment septic tank according to claim 1, wherein about 400 g is sprinkled and formed by adhesion. 3. The combined treatment septic tank according to claim 1, wherein a plurality of the contact materials are vertically arranged in the contact material mount so that the peaks and the valleys of the bellows surface are aligned with each other. 4. The backwash pipe is generally formed so that a plurality of pipe bodies along the longitudinal direction are horizontally arranged in parallel on both sides of an air diffusing pipe arranged at the center bottom of a pair of contact material mounts. The combined treatment septic tank according to any one of claims 1 to 3, wherein the combined treatment septic tank is formed in a rectangular ring shape, and a plurality of air ejection holes are formed at predetermined intervals on the left and right side surfaces of the backwash pipe. 5. The contact aeration tank has a substantially vertical hexagonal shape or a barrel shape in which the center of both sides slightly protrudes outward in a substantially V shape when viewed from the front and the vertical width is larger than the horizontal width. The merged treatment septic tank according to any one of claims 1 to 4, which is formed in. 6. The combined treatment septic tank further comprises a settling tank,
The combined treatment septic tank according to claim 1, further comprising a disinfection tank.