JPS6219294A - Night soil septic tank - Google Patents

Abstract

PURPOSE:To raise the purification efficiency of sewage by providing two aeration chambers for aerating filtered sewage and packing small cylindrical bodies in the aeration chambers to enhance the aeration efficiency in the aeration chambers. CONSTITUTION:The first separation chamber 11, the second separation chamber 14, the third separation chamber 15, a reserve filter chamber 22 charged with a filter 23, the first aeration chamber 26, the second aeration chamber 27, a settling chamber 35 and a stabilization tank 36 charged with a filter medium 40 are successively arranged from an inlet 12 for water to be treated to a discharge port 38 to form each chamber of the septic tank. Aeration cylinders 28 which are vertically positioned at the central parts of the aeration chambers 26 and 27, small cylindrical bodies which are packed between the inner wall of the aeration chamber and the aeration cylinder 28, and an air feed pipe 33 which injects the air for stripping off a surplus microbe film deposited on the surface of the small cylindrical body and the air for injecting into the inner bottom part of the aeration cylinder 28 are provided. The sludge of the surplus microbe films on the inner bottom part of the aeration chamber is returned to the chamber 11 by the lifting action of the air injected from the feed pipe 33 through a return sludge pipeline 34.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention can purify domestic wastewater so that it can be reused, and can be useful for saving water resources or eliminating wastewater pollution. This relates to human waste septic tanks.

[Background of the invention]

In order to prevent wastewater pollution caused by the overflow of industrial wastewater, livestock wastewater, domestic wastewater, etc., a human waste septic tank for purifying these wastewaters has a structure as shown in FIG. 1. This human waste septic tank introduces waste water from a human waste water inlet 1 into a septic tank 2 to measure the decay of the waste, and then passes the water in this septic tank 2 through a preliminary filtration chamber 3 to a three-dimensional oxidation tank 4. to be introduced within. The flowing water that has been oxidized in the oxidation tank 4 is disinfected in the disinfection tank 5 and then discharged from the outlet 6, but this conventional human waste septic tank is equipped with an effective aeration mechanism. There were concerns that effective purification was difficult to achieve because of the lack of cleanliness.

[Purpose of the invention]

The present invention has been made by focusing on such conventional problems, and includes two aeration chambers (multi-stage) for aerating filtered wastewater, and improves the aeration effect in these aeration chambers. Therefore, it is an object of the present invention to provide a human waste septic tank in which the oxidation efficiency can be increased by filling the aeration chamber with a small cylinder made of plastic, for example.

[Embodiments of the invention]

The present invention will be explained in detail below based on the embodiment shown in FIGS. 2 and 3.

Reference numeral 10 denotes a human waste septic tank according to this embodiment, and this human waste septic tank can be applied to anything from a concrete structure constructed on site to a small scale structure that can be transported. 11 is the first
This first separation chamber 11 is provided with an inlet 12 and an exhaust port 13 through which wastewater such as industrial wastewater, livestock wastewater, domestic wastewater, etc. can flow. . 14 is a second separation chamber provided next to the first separation chamber 11; 15 is a third separation chamber provided next to the second separation chamber 14; The upper part of the partition wall 16 between the first separation chamber 14 and the second separation chamber 14 and the partition wall 17 between the second separation chamber 14 and the third separation chamber 15 are provided with running water 01.
8 and 19 are formed. 20 and 21 are buckles located close to the water inlets 18 and 19. Reference numeral 22 denotes a third separation chamber 15 (a secondary filtration chamber provided therein, and an appropriate quilter 2 is installed in this preliminary filtration chamber 22).
3 is filled. This child g4 filtration chamber 22 and the third
A water outlet 25 is formed at the lower part of the partition wall 24 between the separation chamber 15 and the separation chamber 15 . 26 is a first aeration chamber provided next to the preliminary filtration chamber 22; 27 is a second aeration chamber provided next to the first aeration chamber 26; A cylinder 28 is positioned in the vertical direction. Between this aeration cylinder 28 and the inner walls of the aeration chambers 26 and 27, a cylinder with a diameter of about 3 crn, for example, is installed to enhance the aeration effect of the treated water. A large number of small cylinders 29 made of plastic and having a length of about 5 crn are filled randomly.For example, the small cylinders 29 are formed by opening the bottom of a Yakult container.30 31 is a water outlet provided at the upper part of the partition between the preliminary filtration chamber 22 and the first aeration chamber 26, and 31 is a water outlet provided at the upper part of the partition between the first aeration chamber 26 and the second aeration chamber 27. The first aeration chamber 26
And at the inner bottom of the second aeration chamber 27, about 1 inch from the bottom of the 70 chamber
A shelf 32 is placed above the five saws, and the aeration cylinder 28 is held in an upright position in the center of this shelf. 66 is an air supply pipe, and the air supplied by this air supply pipe 66 is injected at the inner bottoms of both of the aeration cylinders 28. 34 are both aeration chambers 26.
The sludge return pipe 27 has an opening at its inner bottom, and the other end opening of this sludge return pipe 34 is located within the first separation chamber 11 . Through this sludge return pipe 64, the air injected from the air supply pipe 36 is used as a means for returning the sludge at the inner bottom of both aeration chambers 26 and 27 to the first separation chamber 11, based on the principle of an air lift pump. Use to send it back. 35 is a settling chamber provided next to the second aeration chamber 27; 66 is a stabilizing tank provided next to the settling chamber 35; 37 is a pump room provided next to the stabilizing tank 66; The treated water in the stabilizing tank 36 can be drained from the discharge port 68 by a pump (not shown) installed in the tank 67. Reference numeral 69 indicates a water outlet provided at the upper part of the partition wall between the second aeration chamber 27 and the settling chamber 35, and reference numeral 40 indicates a water inlet provided in the upper part of the partition wall between the second aeration chamber 27 and the settling chamber 35; The filter material is made by stacking charcoal, gravel packets, and coarse sand in this order from below on a shelf 41 provided above the Mffl, and the flowing water in this stabilizing tank 36 flows into the settling chamber 35.
Water is supplied from below, passes through the filter medium from below to above, and the supernatant water is discharged from the discharge port 38 by a pump.

Note that 42 indicates a manhole.

The structure of this embodiment has been described above. Next, the operation will be described. The wastewater flowing in from the inflow pipe 12 first flows into the first
During this passage, solid matter is precipitated and separated, and decomposed by aeration due to sewage retention, and is separated into sewage, scum, and intermediate water.

Next, the second separation chamber 14 and the third separation chamber 15:: Therefore, the same process is repeated, and the supernatant water in the third separation chamber 15 is passed through the filter 23 in the preliminary filtration chamber 22. and filter to complete further processing. - The water to be treated after the next treatment, that is, the water to be treated that has passed through the filter 23, is supplied into the first aeration chamber 26.
Effective aeration is achieved in the inner part 6 by the air injected from the air supply pipe 36 and the packed bed of the small cylindrical body 29. Next, the same aeration action is repeated in the second aeration chamber 27 (2), and a secondary treatment is performed in which the precipitation chamber 35 (2) is supplied. Small cylinder 29 filled in second aeration chamber 27
The excess microbial film adhering to the surface of the small cylinder body 29 is removed by periodically interrupting aeration and injecting air from the air supply pipe 66 from the bottom of the packed layer of the small cylinder body 29. The excess microbial film is removed, and the precipitated sludge from the removed excess microbial film is transferred to the return piping,
Due to the action of the air lift pump due to the air jet force,
It is returned to the first separation chamber 11. The water to be treated that has been subjected to the secondary treatment in the first aeration chamber 26 and the second aeration chamber 27 flows from the bottom to the top in the filter medium 40 of the stabilization tank 66 after the settling chamber 35. The treated water that has passed through the filter medium 40 is sent to the drain port 38 by a pump action, and can be used, for example, as water for flushing toilets, watering trees, car washing, industrial water, and other miscellaneous uses. . When discharging this treated water,

A disinfection tank (not shown) is provided, and the water is disinfected with a solid chlorine agent (containing 70% chlorine) in the disinfection tank and then discharged.

[Effects of Examples]

Next, to describe the effect of the above purification effect, the BOD removal rate of the above-mentioned primary treated water was 30% as a result of measurement.
Moreover, the BOD removal rate of the final C-treated water that was subjected to secondary treatment and discharged from the drain port 68 after passing through the stabilization tank 66 was 70%, which was a good result. One of the reasons for this good result is '! The aeration effect and the microorganism removal effect in the J1 aeration chamber 26 and the M2 aeration chamber 27 may be enhanced. That is, both the above-mentioned aeration chambers 26
．． In order to increase the adhesion area of microorganisms, as well as to improve the efficiency of water swirling and the optimization of the cavities in the corrosive filter medium, a small cylindrical body formed by cutting the bottom of a Yakult container, for example, is used. 29, and is equipped with a mechanism that can periodically remove excess microbial film adhering to the surface of the small cylinder body 29. Therefore, according to this septic tank, anaerobic decomposition is efficiently performed with extremely little generation of scum, and a septic tank with excellent purification performance can be provided.

[Summary of the invention]

As described above, 1=the present invention provides a first separation chamber 11, a second separation chamber 1 from the inlet 12 of the water to be treated to the direction of the drain 68.
4. A third separation chamber 15, a preliminary filtration chamber 22 loaded with a filter, a first aeration chamber 26, a second aeration chamber 27, a settling chamber 35, and a stabilization tank 36 loaded with a filter medium are formed in this order, and the above-mentioned Inside the first aeration chamber 26 and the second aeration chamber 27, an aeration cylinder 2 is provided.
8, a large number of small cylinders 29 to be filled between the aeration chamber wall and the aeration cylinder, air for peeling off excess microbial film attached to the surface of the small cylinders 29, and the aeration cylinder. An air supply pipe for injecting air toward the inner bottom of the aeration chamber, and a sludge of excess microbial film that has settled at the bottom of the aeration chamber.
This human waste septic tank is characterized in that it is equipped with a sludge return pipe for returning sludge to the separation chamber of '!51 by the action of an air lift pump using air injected from the air supply pipe.

〔Effect of the invention〕

Therefore, according to this human waste septic tank, especially in the aeration tank, the aeration effect and the separation and recovery of excess microorganisms are effective due to the large number of small cylinders filled, and the mixing rate of BOD and coliform bacteria is reduced. Therefore, cleaning of sewage can be achieved efficiently. In addition, the excess microbial film attached to the surface of the small cylinder can be effectively and periodically removed and returned by air jet force, so it can be used for a long period of time without reducing purification efficiency. effective.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view showing a conventional human waste septic tank. Fig. 2 is an explanatory cross-sectional view showing an embodiment of the human waste septic tank according to the present invention, and Fig. 3 is an explanatory plan view of the same. 10... Human waste septic tank 11... 1st
Separation chamber 12...Inlet 13.
...Exhaust port 14...Second separation chamber 15
...Third separation chamber 16...Dividing wall
17...Dividing wall 18.19...Drain port
20.21... Buckle 22... Pre-filtration chamber 23... Filter 24... Division wall 25... Water outlet 26... First aeration chamber 27... Second aeration chamber 28
... Aeration cylinder 29 ... Small cylinder body 3
0... Water outlet 31... Water outlet 32... Shelf 66... Air supply pipe 34... Sludge return pipe 35.
...Sedimentation chamber 36...Stabilization tank 67
...Pump chamber 68...Discharge port
39... Water outlet 40... Filter material
41...Shelf 42...Spontaneous writing of amendment to manhole procedure) February 22, 1985 Patent Application No. 157851 2, Title of invention Human waste septic tank 3, Patent applicant related to the person making the amendment case 4 , Agent 5, Date of amendment order 6, Number of inventions increased by amendment (1) In the second line of page 5 of the specification, the phrase "vessel..." was replaced with "vessel and this (= similar form)"Container...". (21 In the fourth line of page 5 of the specification, the text "sweat port...
Line up the blue pipes of mm, 16 mm, and 20 mm.
1' A constriction pharyngeal device is installed which selectively opens and closes the mouth of the pipe according to the volume. ” I am corrected. (3; The description of "Brief explanation of drawings" on pages 11 to 14 of the specification sheet is corrected as shown in the attached sheet. Brief explanation of drawings Figure 1 is a cross-sectional explanatory diagram showing a conventional human waste septic tank. The figure is an explanatory cross-sectional view showing an embodiment of the human waste septic tank according to the present invention, and Fig. 3 is a plan cross-sectional view of the same.The fourth factor is an enlarged cross-sectional view of the small cylinder. ...First
Separation chamber 12...Inlet 16.
...Exhaust port 14...Second separation chamber 15
...Third separation chamber 16...Dividing wall
17...Dividing wall 18.19...Drain port
20.21... Buckle 22... Pre-filtration chamber 26... Filter 24... Division wall 25... Water outlet 26... First aeration chamber 27... Second
Aeration chamber 28...Aeration cylinder 29.
... Small cylinder body 30 ... Water outlet 31
...Water outlet 62...Shelf 6
6...Air supply pipe 64...Sludge return pipe
35...Sedimentation chamber 66...Stabilization tank
67... Pump chamber 68... Discharge port
39... Water outlet 40... Filter material
41...shelf 42...manhole

Claims (1)

[Claims] From the inlet 12 of the water to be treated toward its outlet 38, the first separation chamber 11, the second separation chamber 14, and the third separation chamber 15
, a preliminary filtration chamber 22 loaded with a filter, a first aeration chamber 26, a second aeration chamber 27, a sedimentation chamber 35, and a stabilization tank 36 loaded with a filter medium. The second aeration chamber 27 includes an aeration cylinder 28 positioned upright in the center of the aeration chamber, a large number of small cylindrical bodies 29 filled between the inside of the aeration chamber and the aeration cylinder, and Air for peeling off the excess microbial film attached to the surface of the cylinder 29, and an air supply pipe for injecting air toward the inner bottom of the aeration cylinder, and the excess microbial film precipitated at the bottom of the aeration chamber. A human waste septic tank characterized in that it is equipped with a sludge return pipe for returning the sludge to the first separation chamber by an air lift pump action using air injected from the air supply pipe.