JP2001079576A - Private sewage treatment tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-size private sewage treatment tank having enhanced performance. SOLUTION: This private sewage treatment tank is provided with: an anaerobic vessel impurity removal chamber N1 in which an inflow baffle B for allowing inflow water to be treated that is passed through a raw water inflow port 1, to flow into the chamber N1 along a peripheral wall W of the chamber N1, is placed; and also an anaerobic preliminary filtration chamber N2 which is placed adjacently to the anaerobic vessel impurity removal chamber N1 and has a high porosity filter medium F2 within and in which a water-to-be- treated transfer pump A for transferring the water to be treated to the downstream side is placed; wherein a partition wall W0 is formed between the anaerobic vessel impurity removal chamber N1 and the anaerobic preliminary filtration chamber N2 so that the wall height is lower than a set lower water level LWL of the anaerobic preliminary filtration chamber N2, and also, above the partition wall W0, a sludge storage space G for storing sludge as scum is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a septic tank.

[0002]

2. Description of the Related Art Conventionally, in this type of septic tank, a first water treatment tank into which water to be treated flows is provided as a sedimentation separation tank or an anaerobic filter bed layer for removing solids from raw water flowing into the tank. Formed ones are known and used for small household septic tanks and the like.

[0003]

However, such a septic tank occupies a relatively large space because sludge is stored as sediment by sedimentation and separation, and the ratio of the septic tank to the entire septic tank is large. In addition, with the development of a merged septic tank for home use today, the secondary treatment tank has been reduced in capacity by adopting a contact aeration method for biofilm treatment, but the sedimentation and separation tank occupies the secondary treatment tank. At present, it was difficult to reduce the volume.

Accordingly, it is an object of the present invention to provide a small-sized septic tank with high performance in view of the above-mentioned drawbacks.

[0005]

In order to achieve the above object, a characteristic structure of a septic tank according to the present invention is an anaerobic anaerobic tank provided with an inflow cylinder portion through which water to be treated flowing from an inlet of raw water flows along a peripheral wall. A tank contaminant removal chamber is provided, and an anaerobic preliminary filtration chamber provided with a carrier having a large void is provided adjacent to the anaerobic tank contaminant removal chamber, and the anaerobic preliminary filtration chamber is provided with:
Providing a treated water transfer pump for transferring treated water to the downstream side, forming a partition between the anaerobic tank contaminant removal chamber and the anaerobic preliminary filtration chamber lower than a set low water level of the anaerobic preliminary filtration chamber. Thus, a sludge storage space for storing sludge as scum is formed above the partition wall.

[Effects] In other words, the anaerobic tank contaminant removal chamber provided with an inflow cylinder such as a baffle and an inflow pipe for allowing the water to be treated to flow in from the inflow port of the raw water along the peripheral wall,
Since the flow of the water to be treated circulating in the entire anaerobic tank contaminant removal chamber is easily formed by the inflow of the raw water, the solid component is easily crushed by the flow of the water to be treated. Therefore, the solid components contained in the raw water are liable to be sufficiently decomposed by microorganisms, and are easily stored in the anaerobic tank contaminant removal chamber as a smaller-capacity scum. In addition, if an anaerobic preliminary filtration chamber is provided adjacent to the anaerobic tank contaminant removal chamber, for example, provided with a filter medium having a large void having a cell size of 80 mm, the anaerobic preliminary filtration chamber includes the anaerobic tank. Microbial decomposition for anaerobic treatment of organic components in the contaminant removal chamber proceeds. As the filter medium, a honeycomb net member, a corrugated plate member, a clogged filter medium, or the like is used. here,
If the anaerobic preliminary filtration chamber is provided with a treated water transfer pump for transferring treated water to the downstream side, the anaerobic preliminary filtration is performed by adjusting the water level in the upper space by controlling the treated water transfer pump. With the space above the filtration chamber as the whole septic tank, the peak of the inflow of the raw water to be treated can be cut and the flow rate can be adjusted, and the whole septic tank can be smoothly treated.

Further, if a partition wall between the anaerobic tank contaminant removal chamber and the anaerobic pre-filtration chamber is formed lower than a set low water level of the anaerobic pre-filtration chamber, the anaerobic tank contaminant removal chamber is removed from the anaerobic tank contaminant removal chamber. The entire water passage through which the water to be treated flows into the anaerobic preliminary filtration chamber becomes an integral large space, which is formed as a flow rate adjusting function and a sludge storage space for storing scum. Therefore, in the sludge storage space, not only scum generated in the anaerobic tank contaminant removal chamber but also scum generated in the anaerobic preliminary filtration chamber can be stored. In addition, since the filter medium provided in the anaerobic preliminary filtration chamber has a large space, in the anaerobic preliminary filtration chamber, fine solid components are easily floated due to generation of anaerobic gas. In addition, since scum is likely to be generated, the form is more suitable for storing sludge in a scum state, and in general, storing sludge as scum rather than storing as settled sludge increases the density of sludge. It is known that it can function with a small volume, which is useful for reducing the volume of the whole septic tank. For example, when sludge is stored as settled sludge, only the solid component ratio can be concentrated at about 3.7 ppm.
It is known that the density can be increased to about pm.

Further, downstream of the anaerobic preliminary filtration chamber,
An anaerobic filter bed tank is provided, and if a biological filtration tank or a carrier filtration tank is provided downstream of the anaerobic filter bed tank, the biological filtration tank or the carrier filtration tank effectively blocks and concentrates the generated sludge, To help aerobic treatment of treated water efficiently,
This contributes to the reduction of the capacity of the whole septic tank, and at the same time, it functions synergistically to reprocess the concentrated sludge in the anaerobic tank contaminant removal chamber.

Further, if the upper side of the partition is inclined toward the anaerobic tank contaminant removal chamber, the flow of the water to be treated in the anaerobic tank contaminant removal chamber is easily guided and circulated, and It is preferable because sludge can be more easily made to scum in the chamber impurity removing chamber.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the septic tank of the present invention comprises, in order from the upstream side, an anaerobic tank contaminant removal chamber N1, an anaerobic preliminary filtration chamber N2, an anaerobic filter bed tank N3, a carrier fluidizing tank E1,
A carrier filtration tank E2 and a treatment water tank T are provided in this order, and the raw water flowing from the inflow port I is processed while being sequentially transferred, and is discharged from the discharge port Z to the outside.

The anaerobic tank contaminant removal chamber N1 is provided with an inflow baffle or an inflow pipe B as an inflow cylinder for allowing the water to be treated flowing from the inflow port I of the raw water to flow along the peripheral wall W. The configuration is such that a circulating flow of the water to be treated is formed in the anaerobic tank contaminant removal chamber N1 by the inflow of the raw water, and the water to be treated is temporarily stored and crushed to promote scumming.

The anaerobic preliminary filtration chamber N2 is provided adjacent to the anaerobic tank contaminant removal chamber N1 and has a cell size of 80%.
mm filter medium F2. Further, the anaerobic preliminary filtration chamber N2 is provided with a treated water transfer pump A for transferring the treated water to the downstream side, and the water level is adjusted in the anaerobic preliminary filtration chamber N2 to perform the water treatment smoothly. The space G above the anaerobic pre-filtration chamber N2 is formed as a peak cut and flow rate adjusting portion for buffering the inflow of the body water to be treated.

Here, a partition W0 between the anaerobic tank contaminant removal chamber N1 and the anaerobic preliminary filtration chamber N2 is provided with a set low water level L at which the anaerobic preliminary filtration chamber N2 regulates the flow rate of the water to be treated.
It is formed lower than WL and is formed in a sludge storage space for storing sludge as scum above the partition wall W1. Further, an upper side of the partition wall W0 is provided so as to be inclined toward the anaerobic tank contaminant removal chamber N1 side, and the configuration is such that circulation of the water to be treated in the anaerobic tank contaminant removal chamber N1 is favorably performed. ing.

An anaerobic filter bed tank N3 having an anaerobic filter bed F3 is provided downstream of the anaerobic preliminary filtration chamber N2. In addition to digesting water by anaerobic treatment, the generated sludge can be stored as scum or settled sludge.

Downstream of the anaerobic filter bed tank N3, a carrier flow tank E1 and a carrier filtration tank E2 are provided as shown in FIG. The carrier fluidizing tank E1 is a carrier C which is formed so as to be able to flow with the water to be treated in a state where microorganisms are supported.
1 is held and held, and the carrier C is supplied by air supply.
A diffuser tube D1 for flowing the liquid C1 is provided, and an air diffuser is provided inside the diffuser tube D1, and the carrier C is supplied by supplying air bubbles from the diffuser.
1 is made to flow in the carrier flow tank E1. With such a configuration, the water to be treated flowing into the carrier fluidization tank E1 is purified by aerobic decomposition by aerobic microorganisms. The water to be treated which has undergone such treatment passes through the advection wall section 3 provided on the first partition wall W1 that separates the carrier flow tank E1 from the adjacent carrier filtration tank E2.
2 is advected. The advection wall portion 3 is formed in a lattice shape or a comb blade shape, and is configured to prevent the advection of the carrier but allow the advection of sludge or water to be treated.

The filter tank E2 is formed by filling a carrier C2 having a specific gravity higher than that of water at a high density up to a predetermined height. In addition, at a position lower than the predetermined height of the second partition wall W2 that separates the filtration tank E2 and the treatment water tank T1 provided adjacent to the filtration tank E2, a filtration wall portion that allows the water to be treated to flow freely. 4 is formed. As a result, the water to be treated including the sludge flowing to the filtration tank E2 is transferred to the carrier C.
2 is filtered through the deposited filtration layer B, and contains almost no solid content.
Advected to 1. In addition, the second partition W2 is connected at an upper end to the side wall of the septic tank, and the treated water tank T
1 is disposed so as to be hidden below the filtration tank E2. The filter wall portion 4 is formed in a lattice shape, and is configured to prevent the flow of the carrier C2 but allow the flow of sludge and water to be treated. Further, an air diffuser D2 as an agitator for diffusing the carrier C2 and agitating the inside of the filtration tank is provided at a lower portion of the deposited filtration layer. The air is diffused from the air diffuser D2 in a small time zone, so that the carrier can be backwashed and regenerated. Further, the advection wall portion 3 is provided in the air diffusion tube D2.
To the advection wall 3
, And the advection wall diffuser Da, which is configured to be raised along the advection wall 3 on the carrier flow tank E1 side,
And similarly, it diffuses toward the filtration wall part 4, and it is comprised so that the bubble by the diffusion may pass through the filtration wall part 4 and be raised along the filtration wall part 4 at the said treatment water tank T1 side. A filter wall diffuser Db is provided to wash the advection wall 3 and the filter wall 4, respectively, to prevent clogging and the like.

Here, the advection wall 3 and the filtration wall 4
Is provided at a position lower than a predetermined height, which is the height of the upper end of the pile of the sedimentary filtration layer B, so that the to-be-treated water always passes through the sedimentary filtration layer B after a predetermined distance. Any structure may be used as long as it allows the advection of water and filters the water to be treated in the sediment filtration layer B. The carrier C1 has a specific gravity of 0.9 or more and 1.2 or less, which can flow together with the water to be treated, and the carrier C2 has a specific gravity of 1 or more and 1.2 or less.

Further, the carrier fluidizing tank E1 is provided with an air lift pump A1 for transferring the water to be treated to the anaerobic tank contaminant removal chamber N1, and the sludge generated by the water treatment is treated together with the water to be treated in the anaerobic tank. The carrier filtration tank E2 is provided with an air lift pump A2 for transferring the water to be treated to the anaerobic tank contamination removal chamber N1, while being configured to be transferable to the inflow baffle B of the contamination removal chamber N1. The sludge generated by the regeneration of the carrier C2 is passed through the carrier filtration tank E2.
It can be transferred from inside to the anaerobic tank contaminant removal chamber N1 together with the water to be treated.

Even if a large amount of water to be treated flows into the purification tank above the steady water level of the carrier fluidizing tank E1 and the carrier filtering tank E2, the carriers C1 and C2 in the tank flow out to other tanks. The outflow prevention member 5 for preventing outflow is made of a net material finer than the carrier, and is configured to be divided into a plurality of pieces and taken out of the manhole H. The outflow prevention member 5 is provided with an opening 5a in a part, and a duct-shaped carrier input portion 5b is extended. Thereby, even if air is diffused in the carrier fluidizing tank E1 and the filtering tank E2 to form a convection of the water to be treated, the flow is formed so as to flow smoothly without being hindered by the outflow preventing member 5. You. Further, in the case where the carrier is filled in the carrier fluidizing tank E1 and the carrier filtration tank E2 or the carrier is exchanged, the carrier can be easily charged and sucked through the carrier charging section 5b.

Further, the outflow prevention member 5 is provided with a diffuser tube insertion hole 5c through which the diffuser tube D1 can be inserted and removed, and the air supply tube connected to the diffuser tube D1 has the diffuser tube D1. In a state in which the trachea is fixed in the carrier flow tank E1,
A cover member 5d for covering the diffuser tube insertion hole 5c is integrally connected to prevent the carrier from flowing out. The air supply pipes and the like are arranged in the space above the carrier filtration tank E2, and the pipes above the carrier flow tank E1 are minimized.

The treated water tank T allows only the clean supernatant portion which has passed through the filtration tank E2 to be discharged to the outside, and the water to be treated flows into the disinfecting tank Q provided at the upper part, and the solid disinfectant Q
After being disinfected by contacting with No. 1, it is discharged to the outside of the tank.

Thus, the carrier flow tank E1 and the filtration tank E2 are provided in an open state on the water surface, and are arranged in a state where the carrier can be easily exchanged and the water quality can be easily checked from the upper space. In this case, it can be easily performed from above through the manhole H provided in the septic tank without disassembling the inside of the septic tank.

With the above-described configuration, a septic tank with five tanks is formed. Conventionally, a septic tank comprising a sedimentation separation tank or an anaerobic filter bed tank and a contact aeration tank has a capacity of 3.8 m ³ or 2.8 m ³ . On the other hand, in the case of the present invention, the anaerobic impurity removing tank 0.57 m ³ , the anaerobic preliminary filtration chamber 0.42
m ^3, the anaerobic filter bed tank 0.5 m ^3, the carrier fluidizing tank 0.2 m ^3, carrier filtration tank 0.1 m ^3, total 1.9 treatment water tank 0.19 m ³
It can be seen that it works well with a small capacity of 8 m ³ , which indicates that it contributes to downsizing of the whole septic tank.

[Alternative Embodiment] In the previous embodiment, the anaerobic filter bed tank and the carrier fluidizing tank were employed downstream of the anaerobic preliminary filtration chamber. However, the present invention is not limited to such a configuration. Various configurations such as a contact aeration tank can be employed. Among them, the above-mentioned carrier filtration tank and the configuration that can efficiently block sludge components and remove it from the water to be treated, such as the biological filtration tank that filters the water to be treated with a high-density filter medium, are used in the upstream anaerobic tank. Cooperation with the removal chamber is preferable because it easily contributes to sludge digestion effectively.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a septic tank according to the present invention.

FIG. 2 is a longitudinal perspective view of a carrier fluidizing tank of the purification tank according to the present invention.

[Explanation of symbols]

 I Inflow port W Perimeter wall B Inflow baffle N1 Anaerobic tank contaminant removal chamber F2 Filter media A Treated water transfer pump W0 Partition wall N2 Anaerobic preliminary filtration chamber LWL Set low water level G Sludge storage space

Claims (3)

[Claims] An anaerobic tank contaminant removal chamber provided with an inflow cylinder portion through which the water to be treated flowing from an inlet of raw water flows along a peripheral wall is provided, and an anaerobic tank contaminant removal chamber is provided adjacent to the anaerobic tank contaminant removal chamber. An anaerobic preliminary filtration chamber equipped with a filter medium having a large void is provided, and the anaerobic preliminary filtration chamber is provided with a to-be-treated water transfer pump for transferring the to-be-treated water to the downstream side, A septic tank in which a partition wall with the anaerobic preliminary filtration chamber is formed lower than a set low water level of the anaerobic preliminary filtration chamber, and formed in a sludge storage space for storing sludge as scum above the partition wall. 2. The septic tank according to claim 1, wherein an anaerobic filter bed tank is provided downstream of the anaerobic preliminary filtration chamber, and a biological filtration tank or a carrier filtration tank is provided downstream of the anaerobic filter bed tank. 3. The septic tank according to claim 1, wherein an upper side of the partition wall is inclined toward the anaerobic tank contaminant removal chamber side.