JPH03151097A - Cleaning device for sewage - Google Patents

Abstract

PURPOSE:To allow the sufficient treatment of even the waste water contg. BOD and COD components of a high concn. by providing a sludge digestion tank which is provided with an aerator in the bottom and digests sludge in aerobic environment and returning the digested sludge again to an aeration tank. CONSTITUTION:The aerobic environment is maintained in the sludge digestion tank 60 by the air supplied from an aerator 61 and the sludge 52 supplied from a settling tank 50 is activated and digested. The supernatant liquid thereof is returned to the 1st aeration tank 20, by which the cleaning effect of various kinds of living things from the Protozoa of the 1st aeration tank 20 to the Metozoa of the 2nd and 3rd aeration tanks 30, 40 is utilized. In addition, the food chain between these microorganisms is utilized, by which even the sludge generated in the sludge cleaning device is mostly digested in the device. The amt. of the remaining sludge is drastically decreased and the maintenance of the device is extremely facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sewage purification device that purifies various kinds of wastewater to be drained, and in particular, a high-concentration sewage purification device suitable for purifying high-concentration organic sewage. Regarding equipment.

[Prior Art] Conventionally, a purification method using microorganisms is widely known as a method for purifying wastewater. Further, for example, a treatment method using activated sludge organisms is also commonly used to treat high concentration waste liquid generated by artificial dialysis and the like. In other words, in a treatment device that uses activated sludge to treat high-concentration waste liquid from artificial dialysis, etc., aeration (aeration tank) is carried out for a long period of time while supplying sufficient air into the wastewater.
Next, it is sent to a sedimentation tank, where supernatant water is separated from the mixed liquid, and this supernatant water is disinfected with chlorine in a disinfection tank, and then discharged to the sewer system.

[Problems to be Solved by the Invention] However, the above-mentioned conventional methods and devices for purifying wastewater have a problem in that a sufficient purifying effect cannot be obtained. The highly concentrated waste fluid from the above-mentioned artificial dialysis, etc. contains protein metabolites such as urea, uric acid, creatinine, guanine derivatives, potassium, and phosphorus, as well as acetic acid and glucose contained in the dialysate. Contains large amounts of organic water pollutants such as Therefore, not only when these waste liquids are discharged into rivers as they are, but also when they are treated with the conventional wastewater purification methods and equipment mentioned above, there is a risk that the processing capacity will be exceeded, and in that case, high concentration BOD
These water pollutants, including COD components, are discharged directly into rivers.

In particular, these water pollutants are associated with high concentrations of BODl CO
Because they contain component D, if they are released in large quantities, rivers will be severely polluted, and stricter standards have been set for wastewater standards by the Prime Minister's Office Ordinance and sewerage standards set by each prefecture.

Therefore, in view of the above-mentioned problems in the prior art, the present invention aims to solve the problem of high concentrations of BOD and COD generated by artificial dialysis, etc.
To provide a sewage purification device which can sufficiently treat waste liquid containing components and does not accumulate much sludge in the device.

[Means for Solving the Problems] According to the present invention, the above object is to provide a raw water regulating tank that temporarily stores sewage from a sewage source and supplies the stored sewage to the downstream side at a constant flow rate; A plurality of aeration tanks are installed in series on the downstream side of the adjustment tank, a contact material with active microorganisms attached is placed inside the aeration tank, and an aerator is installed on the bottom of the aeration tank. In a wastewater treatment equipment equipped with a sedimentation tank for settling sewage and discharging the supernatant water, an aerator is further provided at the bottom, and the sedimentation tank takes in the sludge to create an aerobic environment. This is achieved by a sewage purification apparatus characterized in that a sludge digestion tank is provided below to digest sludge, and the sludge water digested in the sludge digestion tank is returned to the aeration tank.

[Function] That is, according to the above-mentioned sewage purification device, an aerator is provided on the bottom of the device, and a plurality of aeration tanks each having a contact material with active microorganisms attached therein are arranged in series to remove highly concentrated sewage. In addition to increasing the purification capacity, a sludge digestion tank is provided to take in and digest the sludge settled at the bottom of the settling tank, and the sludge water digested in this sludge digestion tank is returned to the aeration tank. This makes it possible to sufficiently digest the sludge generated by purifying highly concentrated sewage.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

First, attached FIG. 1 shows a sewage purification apparatus for purifying high-concentration waste liquid from artificial dialysis or the like.

This highly concentrated waste fluid from artificial dialysis, etc. contains protein metabolites such as urea, uric acid, creatinine, guanine derivatives, potassium, and phosphorus, as well as large amounts of water pollutants such as acetic acid and glucose contained in the dialysate. , high concentration of BOD, C
Contains OD components. On the other hand, for example, the wastewater standards stipulated by the Prime Minister's Office Ordinance stipulate that the BOD and COD of wastewater discharged into rivers, etc. is 160 (ppm) or less, and the daily average value thereof is 120 (ppm) or less. . In contrast to these wastewater standard values, the BOD value of dialysate, which is a highly concentrated waste liquid from artificial dialysis, etc., is 5300 (ppm),
The COD value is 2300 (ppm), and the BOD value of dialysis wastewater is 4000 (ppm) and the COD value is 2000 (ppm), which is of course the same as the above wastewater standard value, but the BOD value of general household gray water is 500. (pl)m)
, even when compared to COD values of 200 (ppm), etc., the digit is thicker by more than one digit.

In the sewage purification apparatus of the present invention, such extremely high concentration waste liquid is sent out from a sewage source, which is a drainage facility of a hospital, for example, and flows into the raw water adjustment tank 10 as sewage. This raw water adjustment tank 10 is provided with a so-called sewage supply pump 12 for supplying the sewage 11 stored therein at a constant flow rate, and a level switch for controlling the operation and stop of this sewage supply pump 12. 13 are provided. That is, the sewage supply pump 12 is connected to the raw water adjustment tank 1.
When the sewage 11 flowing into the tank exceeds the upper limit level, it is activated and supplies the sewage 11 stored inside to the downstream side at a constant flow rate.

Due to the operation of the sewage supply pump 12, the level of the sewage 11 begins to fall, and the position of the level switch 13 also falls accordingly. And this level switch 1
3 reaches the lower limit level, the sewage supply pump 12 stops operating and stops supplying the sewage 11 to the downstream side. Further, an alarm level is further provided above the upper limit level, and when the liquid level of the waste water 11 stored in the raw water adjustment tank IO exceeds this alarm level, a buzzer is activated. The device is designed to issue a warning to the driver using a red light bulb.

A plurality of (three in the above embodiment) aeration tanks 20.30140 are arranged in series on the downstream side of the raw water adjustment tank 10 described above. Further, in the above embodiment, the first aeration tank 2
The 0 and 2nd aeration tank 30 are provided integrally, and the 3rd aeration tank 40 is provided separately from these. and,
This third aeration tank 40 is further provided with a settling tank 50.

Among these plurality of aeration tanks, first, the first aeration tank 20
As shown in the figure, an air supply nozzle 21 called an aerator is provided on the bottom surface, and contact materials 22, 22, etc. to which active microorganisms are attached are arranged inside the nozzle. The detailed internal structure of the first aeration tank 20 is as shown in the attached FIGS. 2(a) and (b). Contact material 22 with active microorganisms such as protozoa attached to two side walls, respectively.
．． 22... is attached. This contact material 22.
Although not shown in the figure, 22... is formed by stacking porous rod-shaped members such as ceramics in multiple stages, and a thin film of bacteria and microorganisms, which are protozoa, is formed on the surface. It settles on the body and decomposes organic matter.

Moreover, inside the first aeration tank 20, between the contact materials 22, 22, . . . so-called rectifier plates 23.
23 are arranged parallel to those surfaces, and furthermore, the aerator 21 is arranged at the center of the bottom surface of the tank 20. As shown in FIG. 3, this aerator 21 includes an opening 21 for introducing compressed air into the bottom of a cylindrical member in which a notch 21L211 is formed in the middle.
A guide vane part 213, 213 for rotating the introduced air bubbles is provided on the upper part of the guide vane part 213, and a plurality of semispherical protrusions 21 are provided above the guide vane part 213.
4.214... is provided. Further, reference numerals 215 and 215 in the figure indicate that the aerator 21 is connected to the tank 20.
This is the so-called support part when fixing to the bottom of the machine.

The compressed air (indicated by the white arrow in the figure) introduced from the opening 212 formed at the bottom of this aerator 21 becomes bubbles and rises. At that time, as the bubbles rise, The liquid remaining inside the aerator 21 also rises. As a result, as shown by the arrow in the figure, a notch 211 provided in the cylindrical side wall of the aerator 21
．． 211, a water flow is generated in which the liquid on the outer periphery flows into the inside thereof, and along with this water flow, the first aeration tank 2
The sludge that settles on the bottom of the tank will also be circulated and transported. These bubbles continue to rise together with the liquid, but as shown by the arrow in the figure, the air bubbles rise in the upper guide vane section 213.
．． 213, and further collides with the spherical protrusions 214, 214, etc. on the upper part, and spreads out and rises.

As described above, the compressed air bubbles introduced from the bottom of the aerator 21 rise toward the surface of the wastewater, as shown in FIG. The liquid in 20 is stirred, creating turbulence. In addition, as shown in FIG. 2(a), the above-mentioned turbulent flow is rectified in parallel between the contact materials 22, 22 by the parallel rectifying plates 23, 23 provided in the aeration tank 20. It goes to every part.

The air bubbles diffused by this stirring turbulent water flow are uniformly supplied to the surface of the contact material 22, 22... and activate the bacteria and microorganisms that have settled in a thin film on the surface, thereby causing the sewage water to Digest and decompose organic matter.

In addition, the first aeration tank 20 and the next second aeration tank 3
The fluid flow between 0 and 0 is fluidly coupled by so-called overflow, in which the supernatant flows out into the next tank by overflow.

Next, the second and third aeration tanks 30.40 are also provided with air supply nozzles 31.41 called aerators on their bottom surfaces, and inside them are contact materials 32.32.42 with active microorganisms attached. .42 is placed. -For example,
The detailed internal structure of this second aeration tank 30 is shown in the attached FIGS. 4(a) and 4(b), and this structure is the same for the third aeration tank 40. Also, between the second aeration tank 30 and the third aeration tank 40, similarly to the above,
The supernatant flows out by overflow into the next tank, so-called fluidly connected by overflow, that is, in FIGS. 4(a) and (b), the above-mentioned second tank
The aeration tank 30 also has a box-shaped outer shape, and contact materials 32, 32 to which active microorganisms are attached are attached to a pair of side walls.

This contact material 32.32 is also formed by stacking a plurality of porous rod-shaped members, such as ceramics, on the surface of which there are protists and even...
A wide variety of living organisms, including metazoan organisms, are used to decompose organic matter and utilize the purifying action of these various living organisms.

Inside the second aeration tank 30, a so-called current plate 33.33 is provided between the contact material 32.32.
are arranged parallel to their surfaces, and the aerator 31 is arranged parallel to the contact material 32, 32.
It is arranged at a corner of the bottom surface of the second aeration tank 30, apart from the second aeration tank 30.

This aerator 31 has the same structure as the aerator 21 shown in FIG. 3 above, and its operation is similar to that shown in FIG.
This is the same as shown in the figure, and the compressed air introduced from the opening formed at the bottom of the aerator 31 becomes bubbles and rises, and at that time, as the bubbles rise, the aerator 3
1. The liquid that stays inside rises as well, and as a result,
The liquid on the outer periphery of the aerator 31 flows into the notch provided in the cylindrical side wall of the aerator 31, and a water flow that circulates inside the second aeration tank 30 is generated. This bubble is
After that, the liquid continues to rise together with the liquid, but it is rotated by the guide vane at the top of the liquid, and further, it collides with the spherical protrusion on the top of the liquid, causing it to spread and rise.

As mentioned above, the bubbles of compressed air introduced from the bottom of the aerator 31 are
The aerator 31 rises toward the surface of the sewage inside the second aeration tank 30, but since this aerator 31 is placed at the corner of the bottom of the second aeration tank 30, as shown by the arrow in the figure, As the bubbles rise, a water flow circulates inside the tank 30. As shown in FIG. 4(a), this circulating water flow stably flows in parallel between the contact materials 32, 32 by the parallel rectifying plates 33, 33, and some of them A laminar flow is formed. Oxygen is introduced into the wastewater in such a stable flow including laminar flow, and oxidation, microbial growth, and purification are efficiently performed.

Next, the settling tank 50 provided downstream of the third aeration tank 40 has a sludge settling tank 51 which is an inverted triangular pyramid, and the supernatant overflowing from this sludge settling tank 51 is then Discharged into rivers, etc. as wastewater. Further, at the bottom of the sludge process S tank 51, a pipe 6 is provided for taking in the sludge 52 to be settled.
3 is placed. This pipe 53 is further connected to a sludge digestion tank 60, and at the bottom of this sludge digestion tank 60, an aerator 61 similar to the above is arranged. The inside of this sludge digestion tank 60 is placed in an aerobic environment by the air supplied from the aerator 61, and the sludge 52 supplied from the settling tank 50 is activated and digested. and,
Another pipe 62 provided at the upper part of this sludge digestion tank 60 allows the upper supernatant to be returned to the first aeration tank 20.
It is designed to be returned to the

In this way, the first to third aeration tanks 20.30.4
The sludge 5 treated with 0 and settled at the bottom of the sludge settling tank
2 is taken into the sludge digestion tank 60 and digested, and further,
By adopting a structure in which the two-liquid liquid is returned to the first aeration tank 20, from the protozoa in the first aeration tank 20 to the metazoa in the second and third aeration 1=330.40. By utilizing the purifying action of a wide variety of organisms up to the level of sewage purification, and by utilizing the food chain between these microorganisms, it becomes possible to digest most of the sludge generated inside the sewage purification device within the device. The amount of sludge remaining inside the sewage purification device is greatly reduced, and the maintenance of the device becomes very simple. In addition, in FIG.
Furthermore, it is an air pump for supplying compressed air to the bottom of the sludge settling tank 51, and in addition, the reference numeral 71
is a solenoid valve for controlling opening and closing of compressed air supplied from the air pump 70 to the bottom of the sludge settling tank 51.

Furthermore, in the above embodiment, a sewage purification device is shown in which the aeration tank is provided in three stages, each of which has a contact material 22,22 on which bacteria and microorganisms are deposited in a thin film form. However, the present invention is not limited to this, and it is clear that the number can be set in accordance with the concentration of wastewater and the processing capacity necessary for digesting the wastewater. Further, the return of the supernatant from the sludge digestion tank 60 is not necessarily limited to the first aeration tank 20, and even if the structure is such that the supernatant is returned to the second or third aeration tank, the above-mentioned method may be used. Naturally, almost the same effect can be obtained.

[Effects of the Invention] As is clear from the above explanation, according to the sewage purification apparatus of the present invention, waste fluid containing high concentrations of BOD and COD components generated from, for example, artificial dialysis, etc. can be removed from protozoa and By utilizing the purifying action of a wide variety of organisms, including animals, it is possible to sufficiently digest and purify the sludge that is generated within the equipment. Since sludge is self-processed through digestion circulation, there is no accumulation of sludge within the device, making it possible to provide a sewage purification device that has high purification ability and is easy to maintain. also has very good effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall structure of a sewage purification device that is an embodiment of the present invention, and FIGS. FIG. 3 is a top view and a cross-sectional view showing the structure of the tank, FIG. (b) is a top view and a sectional view showing the structure of a second aeration tank, which is another component of the sewage purification device.

Claims (1)

[Claims] A raw water adjustment tank that temporarily stores wastewater from a wastewater source and supplies the stored wastewater to the downstream side at a constant flow rate, and a plurality of contact materials attached to active microorganisms that are installed in series downstream of the raw water adjustment tank. A wastewater treatment device equipped with an aeration tank disposed inside the aeration tank and equipped with an aerator on the bottom, and a sedimentation tank in which wastewater purified through the plurality of aeration tanks is settled and the supernatant water is discharged. Further, an aerator is provided at the bottom, and a sludge digestion tank is provided for taking in the sludge settled at the bottom of the settling tank and digesting the sludge in an aerobic environment, and the sludge is digested in the sludge digestion tank. A sewage purification device characterized in that sludge water is returned to the aeration tank.