JPH05345191A - Septic tank - Google Patents

Abstract

PURPOSE:To improve aeration effect of an aeration tank by positioning a cylindrical container- connecting filter material net wherein small bottles are arranged in parallel and molded above and below the aeration tank surrounding the small bottles and positioning the filter material net so as to arrange large opening hole parts of the small bottles to the lower side at the lower stage and the filter material net so as to arrange the large opening hole parts of the small bottles to the upper side at the upper stage. CONSTITUTION:A septic tank 14 is constituted of a precipitation tank 1 of the lowest stage storing a precipitate in a waste water, an aeration tank 2 of the middle stage collecting small bottles made of a synthetic resin material and having no top and no bottom and having a filtering effect and an air tank 3 of the uppermost stage wherein a flow-in pipe 20 for the waste water, a discharging pipe 5 of fresh water, etc., are positioned. In addition, small bottles are arranged in the transverse direction on the upper and lower stages of the aeration tank 2 and respectively fixed and large opening holes of the small bottles are respectively faced to the outside and a reverse washing pipe 8 positioned on the upper part of the precipitation tank 1 is placed on the lower stage and cylindrical container joined filter material nets 10 and 11 positioned below the water level of the air tank 3 are provided on the upper stage. As the result, cleaning effect can be accelerated even by the cylindrical container joining filler material nets to make a polyvinyl chloride plastic material and a shelf frame unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, when purifying wastewater such as human waste and wastewater, uses a small bottle made of synthetic resin as a purification filter material in the aeration tank, and lays this filter material freely and backwashes it. The present invention relates to a septic tank capable of improving the effect and significantly promoting the sewage purification function.

[0002]

2. Description of the Related Art Conventionally, in areas where sewerage is not complete, small-scale septic tanks are being used in order to deal with water quality regulations, environmental protection issues such as odors, and political issues such as water rights. Such a device mainly comprises a filtration means having a physical means using a filtration material and a biological means using an organic substance-decomposing bacterium. In particular, in order to maintain the processing capacity of this filtering means above a predetermined level, as a filtering material, gravel, activated carbon, charcoal, etc. or cement, fly ash, inorganic materials such as molded articles made of ceramics, or synthetic resin Various materials such as organic materials are used.

Further, in order to smooth the movement of the filter material by the aeration air for replacing old and new aerobic microorganisms that attach to the filter material, an inorganic material having a spherical shape or a shape close to a spherical shape is used. Be done. Further, in order to clean the filtration means and to activate various microorganisms to purify water, a backwash pipe or an air diffusing pipe is used to increase the oxygen concentration in the water, and the water flow causes the inside of the aeration tank to rise. Where oxygen concentration is high,
It can be maintained at various values such as low places.

There is a so-called sewage purification tank of the so-called Ishii type water circulation system of the activated sludge method that satisfies these conditions. (Isao Ishii, Kunihiro Yamada, "Sewer Revolution" Fujiwara Shoten) This sewage purification tank is the first septic tank in order from the sewage inlets such as night soil, kitchen water, laundry drain, bath water, etc.
The system comprises a second septic tank, a preliminary filtration tank, a first aeration tank, a second aeration tank, a precipitation tank, a third treatment tank, a disinfection tank, a precipitation tank, and a pump in this order. Of these, the above-mentioned filter material used was a Yakult container-shaped waste container with the bottom cut off.
The aeration tank, the second aeration tank, the third treatment tank, and the preliminary filtration tank are particularly characteristic.

The small bottle body of the Yakult waste container used as the filter material is obtained by cutting the bottom of the waste container. The so-called activated sludge method is used to propagate the microorganisms and to keep the propagated microorganisms healthy. It excels in satisfying the requirements. In other words, oxygen is blown into the sewage to aerate it,
The concentration of oxygen concentration in the wastewater can surely exist due to the undulations of the Yakult container, and it is possible to maintain a state in which many kinds of microorganisms can survive there.

Microorganisms have the property of adhering not only to the inside and outside of the container body but also to the front and back surfaces thereof, and actively exhibiting the purifying action of sewage. ..

[0007]

However, such a conventional septic tank requires a vinyl chloride vignette and a shelf frame material for fixing the vinyl chloride vignette in the upper and lower stages of the filter material, which leads to an increase in cost. It is not easy to assemble with it. In addition, L of FRP which attaches the PVC
Since it is necessary to manufacture a new mold shelf material, it has been insufficient to solve the present environmental protection problem as much as possible.

[0008]

In order to solve the above-mentioned problems, in the septic tank of the present invention, the bottom settling tank for accommodating the sediment in the wastewater and a small bottle made of synthetic resin material and having no bottom A small-scale aeration tank having a filtration effect and a middle-stage aeration tank, and a top-stage air tank in which a wastewater inflow pipe, a clear-flow discharge pipe, etc. are arranged, and the small bottles above and below the aeration tank. Are horizontally arranged in the same direction and fixed to each other, and the large opening holes of the vials are directed outward, respectively, and placed on a backwash pipe arranged above the precipitation tank in the lower stage, and below the water level in the air tank in the upper stage. It is characterized in that it is provided with a cylindrical container joining filter material network arranged.

[0009]

In the septic tank of the present invention, sewage is made to flow into the aeration tank, and the sewage is purified by the activity of various microorganisms that survive inside and outside the small bottle filled in the aeration tank. The heavy weight of is dropped into a settling tank to be settled. The cylindrical container joint filter net provided in the lower stage of the aeration tank has the large opening hole of each small bottle on the settling tank side, so it has the effect of reducing the flow rate of sewage in the settling tank, Is allowed to settle.

Air is sent into the draft tube by air diffusion from the air diffuser, and various sewage with various oxygen concentrations in the sewage flows from the large opening hole portion of each small bottle of the tubular container joint filter net to the small opening hole portion. Sewage is purified by an aeration tank filled with small bottles that flow through at random, facilitating the free movement of the small bottles in the septic tank, and a small opening hole for each small bottle in the upper tubular container-joined filter screen. The fresh water, which has turned from sewage to fresh water through the large opening hole, rises and flows out through the discharge pipe. This allows
It is possible to improve the aeration effect of the aeration tank while eliminating the need for a conventional vinyl chloride further shelf frame.

[0011]

Embodiments of the present invention will be described below with reference to FIG. 1 by taking a third processing tank as an example. In general, the third treatment tank is arranged next to the preliminary filtration tank and has a role of feeding it to the next-stage disinfection tank. Also, if the amount of wastewater treated is large,
It is set especially when it is not possible to obtain the desired fresh water with a low BOD value, when there is a room in the septic tank installation or cost, or when long-term system cleaning is not desired.

The septic tank 14 is divided into upper, middle, and lower three stages, of which 1 indicates a settling tank, and 1 indicates a sedimentation tank, which is determined by the specific gravity, shape, liquid density, viscosity, etc. of suspended solids contained in wastewater. The rate of precipitation is determined, but bath water from the inflow pipe, night soil,
Heavy objects, mainly sludge and food slag, accumulate at the bottom of the sedimentation tank depending on the inflow speed and type of domestic wastewater. These precipitated heavy matters are opened by opening the valve 17-1 from the blower pipe 17 and injecting air into the air lift 6 through the air diffusing pipe 18, whereby the heavy matters which are the sediments rise and are sucked out to the upper portion. It is returned to the first septic tank, which goes backward in the processing order (not shown) through the substance discharge pipe 16. Further, several columns for fixing the backwash pipe pedestal 7 are also arranged in the settling tank.

Reference numeral 2 denotes an aeration tank, which replenishes oxygen and agitates the mixed solution to increase the chances of contact between the pollutants and the activated sludge, and prevents the activated sludge from settling down. A large number of Yakult container-shaped vials 12 having appropriate aspects are randomly filled. As the aeration effect of this aeration tank, activated sludge inhabiting a wide variety of bacteria, protozoa, etc. is affected by many factors such as nutrition, water temperature, dissolved oxygen, and PH, and changes in the composition of microbial groups in the activated sludge. At the same time, the organic matter in the sewage is used as a nutrient source for the biochemical reactions of oxidation and assimilation to grow, and the sewage is gradually purified.

Here, when the valve 17-2 of the blower pipe 17 is opened and air is ejected from the air diffuser 4 into the draft tube 13, sewage is pushed up from the draft tube 13 and boiled from its upper hole. And the draft tube 13
When sewage enters from the lower opening of the aeration tank 2, the water flow is circulated from the top to the bottom of the aeration tank 2. Therefore, the peculiar shape of the tubular container joining filter material nets 11 and its small opening hole portion 2
By having 2, 23 and large opening holes 24, 25, the water flow circulates throughout the aeration tank 2, and a variety of environments from high oxygen concentration to low oxygen concentration are generated, and aerobic and anaerobic treatment is performed. Are carried out at the same time, and the purification efficiency is much improved.

Reference numeral 3 denotes an air tank, which is an inflow pipe 20 for introducing dirty water, an outflow pipe 5 for outflowing fresh water to the disinfecting layer, an air diffuser 18 for sending air to the air lift 6 of the precipitation tank 1, and an air for the aeration tank 2. Pipe 8 for sending air to the air diffuser 4 and backwash pipe 8
1. Further, valves 17-1 to 17-4 for opening / closing air blow to each of the air diffusers 18 and 4 and the pipe 8-1 and adjusting the air amount thereof, an air blow pipe 17 for feeding air, and the like are arranged, and a water level (indicates the amount of fresh water). There is air above WL). Valve 17-4 here
Is for adjusting the amount of air blown by the degree of opening together with each valve 17-1 to 3, a cleaning pipe 19 for cleaning the sludge of the settling tank 1 is provided, and the outflow of the outflow pipe 5 is the level of the fresh water ( When WL) becomes higher than the outflow pipe 5, fresh water flows out. The fresh water is sent to the next disinfection tank, where it is chlorinated. Chlorination kills pathogenic bacteria that live in the treated water and improves the sanitary safety of the treated water.

Reference numeral 7 denotes a backwash pipe pedestal, which is made of something like Gotoku and serves as a stand on which several columns and circular or square backwash pipes are placed from the bottom of the septic tank container 14, for example, a strong one. Made of plastic material. Reference numeral 8 denotes a backwash pipe, which is assembled in a lattice shape on the backwash pipe pedestal 7, and the backwash pipes 8 are respectively passed through the pipes 8-1 and sometimes the valves 17-
If 3 is opened, each part of the backwash pipe 8, for example, every 15 cm,
Air is ejected from a hole having a small diameter, for example, 2 mm. By ejecting air from the backwash pipe 8 into the dirty water, the circulation of the water flow in the aeration tank is speeded up, and the sludge inside and outside the small bottle-shaped filter material is washed out.

Reference numerals 10 and 11 denote cylindrical container-bonding filter screens, in which Yakult container-shaped small bottles are arranged in the same direction side by side and are gathered side by side. For example, about 150 blocks each having a square shape or It is manufactured by tying it around in a fan shape with tape and burying it in a liquid of FRP material (fiber reinforced plastic material), taking it out and drying it. The cylindrical container joining filter material net 10 arranged in the lower part of the aeration tank 2 is placed on the upper part of the backwash pipe 8, and as shown in FIG. The large opening hole portion 24 is arranged on the settling tank side, and is placed so as to cover the entire horizontal circumference of the septic tank. With the construction of the tubular container joining filter screen 10, the large opening hole on the settling tank side can reduce the flow rate of the sewage water in the settling tank and the flow rate of the sewage water by the backwash pipe 8 to improve the sludge settling effect. To do. Further, on the aeration tank 2 side, due to the slowness of the flow velocity, the small bottle, which is the same as the cylindrical container joining filter screen 10, is made to dance smoothly. Here, in the tubular container joining filter nets 10 and 11, the width of the three-dimensional mesh is the guideline 85 of the Ministry of Health and Welfare.
% Or more is sufficient, and small bottle 2 in water flow circulation and aeration tank 2
Effectively performing the dance of 1.

Similarly, the tubular container joining filter material net 11 shown in FIG. 2 (a) is placed on the mounting table 9 having a shape of Gotoku or is tied with a string from the upper portion by a predetermined suspending member (not shown) for stability. Bind to. The tubular container joining filter material net 11 has a small opening 23
Is arranged on the aeration tank side, and the large opening hole portion 25 is arranged on the air tank side, and the whole horizontal circumference of the septic tank is covered below the water level (WL).
With the configuration of the tubular container joining filter material net 11, the flow velocity can be increased by the small opening hole portion 23 on the aeration tank side due to the slow or slow flow velocity or during backwashing, and the randomly arranged vials can be pressed. Without making the dance smooth, the sludge inside the small bottle is washed out. The large opening hole portion 25 on the air layer side has an effect of lowering the flow velocity of the fresh water in the upper portion and precipitating the precipitate if left.

The platform 9 is also in the form of a grid, for example 150 m.
The ends may be adhesively fixed to the peripheral wall of the septic tank with a bar or a pipe (plastic material) at intervals of about m. The draft tube 13 passes through the tubular container joining filter material nets 11 and 11 and the aeration tank 2. Reference numeral 14 denotes a septic tank, which is made of concrete material or FRP material. Reference numeral 15 is a manhole, which is used for internal inspection and maintenance of the septic tank 14.

FIG. 2A shows a part of the tubular container joining filter material net 11 in the upper stage of the aeration tank, and FIG. 2B shows a part of the configuration of the cylindrical container joining filter material net 10 in the lower stage of the aeration tank. 2 shows a cylindrical Yakult container-shaped vial filled in the aeration tank, 22 and 23 show small opening holes, 24 and 25 show large opening holes, and FIG. Is a view of these bottles from below or above, and 26 is a band strap gathering about 150 of these small bottles 21 and tied around them, and fixing them by immersing them in the FRP liquid and then pulling them up and drying them. The cylindrical container joining filter material nets 10 and 11 are formed, and a space is created inside and outside the vial 21 to effectively bend the water flow. At present, it is being proved that due to the inner diameter and uneven shape of the vial in the aeration tank, microbial growth occurs moderately and that it is effective for the aeration effect. Further, the Yakult (registered trademark) container is a material that does not contain the toxic styrene monomer, which is a general plastic container, but contains rubber, and that microorganisms are easily attached to the roughness of the surface irregularities.

In a septic tank equipped with such a tertiary treatment tank, the BOD value of 10 ppm or less, which is the standard of the Environmental Agency, is
It has been proved that the level is always 1 to 3 ppm.
In addition, this vial is a waste for lactic acid bacteria drinks, and it is appropriate from the viewpoint of the global environment, but not limited to this shape, the vial's inner diameter, height, unevenness, etc. may be any shape that enhances the aeration effect. It is not limited to Yakult container shape. The material of the draft tube, backwash tube, etc. may be semi-permanent such as PVC, PP, FRP.

Further, although the embodiment of the septic tank according to the present invention has been described with reference to an example of a so-called tertiary treatment tank, even if this is a primary aeration tank, a secondary aeration tank or a preliminary filtration tank, the present invention The effect of can be fully exhibited. Further, the shape of the septic tank is not limited to the hopper type, and the deep aeration tank method can be used.

Further, in the above embodiment, the activated sludge method was used as an example. However, a digestion method using anaerobic microorganisms may be used, and the size of the septic tank can be increased by arranging a plurality of the tubular container-joined filter screens horizontally. The effect which is not limited to this can also be produced.

[0024]

INDUSTRIAL APPLICABILITY In the septic tank of the present invention, sewage is allowed to flow in, heavy substances in the water settle at the bottom of the settling chamber, and the large bottles of each of the cylindrical container-bonded filter nets placed under the aeration tank are The opening hole reduces the flow rate of sewage at the bottom of the tank to promote the sedimentation effect of the settling tank, and the sewage flows upstream through the other small opening hole, and the aeration chamber filled with randomly arranged small bottles. The sewage is purified by the sewage, facilitating the dancing of the small bottle during backwashing with the backwash pipe, and the clear stream made of sewage into fresh water rises up the tubular container joint filter net at the upper part of the aeration tank and the small opening at the bottom The hole increases the flow velocity in the aeration tank to enhance the effect of the aeration tank of the small bottle, which is a filter material, and the large opening hole on the other side weakens the flow velocity in the upper part, so that fresh water is discharged by the discharge pipe.

[0025] The purifying action can be promoted even with the tubular container-joint filter material net of this filter material, the PVC plastic material which is a conventional off-the-shelf product and the shelf frame are unnecessary, and the aeration effect of the aeration chamber is effectively made. Can be improved. It also contributes to the effective use of waste.

[Brief description of drawings]

FIG. 1 is a drawing showing a septic tank according to the present invention.

FIG. 2 is a drawing showing a part of a tubular container joining filter screen according to the present invention.

[Explanation of symbols]

 1. Settling tank 2. Aeration tank 3. Air tank 4. Air diffuser 8. Backwash tube 10,11. Cylindrical container joint filter mesh 14. Septic tank container 17-1 to 4 valve 21 Small bottle

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[Procedure amendment]

[Submission date] June 25, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

In order to solve the above-mentioned problems, in the septic tank of the present invention, the bottom settling tank for accommodating the sediment in the wastewater and a small bottle made of synthetic resin material and having no bottom A small-scale aeration tank having a filtration effect in the middle stage and a top-level air tank in which an inflow pipe for sewage and a discharge pipe for a clear stream are arranged, and the small bottle is at least in the lower stage of the aeration tank. Are arranged side by side in the same direction and are fixed to each other, and are arranged on the upper part of the precipitation tank so that the large opening hole portion of the small bottle faces the precipitation tank side and the small opening hole portion of the small bottle faces the aeration tank side. A person characterized by having a tubular container joining filter screen arranged on a backwash pipe.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

In the septic tank of the present invention, sewage is caused to flow into the aeration tank and various microorganisms that survive inside and outside the small bottle filled in the aeration tank purify the sewage. The heavy weight of is dropped into a settling tank to be settled. The cylindrical container joint filter net provided in the lower stage of the aeration tank has the large opening hole of each small bottle on the settling tank side, so it has the effect of reducing the flow rate of sewage in the settling tank, Is allowed to settle.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Air is sent into the draft tube by air diffusion from the air diffuser, and various sewage with various oxygen concentrations in the sewage flows from the large opening hole portion of each small bottle of the tubular container joint filter net to the small opening hole portion. Sewage is purified in an aeration tank filled with small bottles that flow through at random, and the small opening holes of each small bottle in the tubular container joint filter screen allow free movement of the small bottles inside the aeration tank. It facilitates and flows through the large opening hole portion from the small opening hole portion of each small bottle of the tubular container joining filter material net, and rises and circulates in the draft tube. During this circulation, the fresh water is discharged from the discharger by being pushed by the inflowing waste water. As a result, it is possible to eliminate the need for a conventional vinyl chloride net and further a shelf frame and effectively improve the aeration effect of the aeration tank.

Claims (1)

[Claims] 1. A lowermost settling tank for accommodating sediment in wastewater, a middle-stage aeration tank having a filtration effect by collecting small bottles made of synthetic resin and having a bottomless bottom, and a wastewater inflow pipe. A septic tank consisting of an uppermost air tank in which a discharge pipe of fresh water and the like are arranged, and the small bottles are laterally arranged and fixed to the upper and lower stages of the aeration tank, and the large opening holes of the small bottles are placed outside respectively. Toward, the lower stage is mounted on a backwash pipe arranged in the upper part of the precipitation tank, and the upper stage is equipped with a cylindrical container joining filter screen arranged below the water level of the air tank. Septic tank