JPH0130552B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultra-separate sewage treatment method in which sewage generated from each household is classified by type, collected and treated separately according to sewage concentration.

<Prior Art> In general, sewerage drainage systems are classified into combined systems and separate systems. In this case, even though it is called a separate system, it simply separates and discharges rainwater and domestic wastewater and leads this sewage pipe to a centralized sewage treatment plant, and does not lead to fundamental reform of sewage treatment plants, which are becoming larger in scale. .

That is, the conventional sewage treatment method is such that all the sewage generated from each household is conveyed through the same pipe using a water transportation system. The most important point here is that a considerable amount of water is required to transport the fecal mass, which is an organic solid that is drained from flush toilets (of course, it is used for bathing, washing, etc.). (Although draining water is also effective.) For this reason, in order to transport large amounts of wastewater collected from households, the pipes must have a large diameter, and must be buried deeply, which increases construction costs. It is not easy to construct or manage (sewer pipes have few economies of scale). especially,
If this modern sewage system is introduced into rapidly changing rural areas, it will no longer be possible to use the organic fertilizers from manure that was available in the old storage latrines.

In addition, when there was no sewage system, household gray water would exist as running water in side gutters, etc.
As sewage systems are developed, running water disappears, resulting in waterless villages unless alternative water is introduced separately. Furthermore, the sewerage charges associated with the installation of a complete sewerage system include the problem of inconsistency, as the water usage fee is immediately treated as the sewerage usage fee.

<Problems to be Solved by the Invention> In view of the above-mentioned circumstances, the present invention has been developed to treat sewage to the extent possible for each household and to directly drain it into waterways, thereby minimizing the amount of sewage sent to public sewage treatment plants. year,
Furthermore, the present invention provides a super-separate wastewater treatment method aimed at reducing sewerage costs.

<Means for Solving the Problems> The present invention is designed to collect relatively low-concentration wastewater, such as household wastewater discharged from each household, bathroom water, laundry rinse water, etc., by using a dedicated branch pipe. The treated water is guided to simple water treatment tanks such as contact oxidation tanks placed at appropriate locations in the mansion, and the treated water is directly discharged into gutters and waterways, and is also used in kitchens, dirty laundry water, and flush toilets. The human waste discharged from the septic tank is once received in a septic tank, and the highly concentrated sewage such as liquefied solids overflowing from the septic tank is transferred to an organic wastewater tank, which is installed separately with a separate pipe that is different from the above-mentioned pipe. This is a sewage treatment method in which organic water flows into the water supply and only the sewage from the organic water supply is directed to a public sewage treatment plant.

If such a method is adopted, it will be possible to place a flow meter at the outlet of the organic water supply, which is a highly concentrated sewage pipe directly facing a public sewage treatment plant, and the actual sewerage usage fee can be converted. . In addition, since clean water that has been purified in-house (simple water treatment) flows into the gutters and waterways, an unspoiled community environment is created. Furthermore, in a self-septic tank, the human waste is made sterile and odorless in a short period of time by adding a fermentation accelerator, and can be easily treated at home as a high-grade fertilizer. Therefore, the amount of nitrogen flowing into the organic water supply system is reduced by the amount consumed in fields (especially in rural areas), and the amount of nitrogen in treated water, which suffers from excess nitrogen, is reduced.
Phosphorus levels will also be reduced. Of course, if each unit is equipped with a septic tank and the urine is putrefied, most of the fecal pathogens will be killed, so there will be no need to sterilize the treated water.

<Example> The following is a description based on drawings of a facility implementing the present invention.

A branch pipe 2 is installed from the bathroom 1a or laundry 1b, which drains relatively low-concentration sewage in the house 1, and a contact oxidation tank 3, which serves as a simple water treatment tank, is connected to the tip of the pipe 2. Facing the outside gutter 4. In addition, another branch pipe 5 is installed from the kitchen 1c, the laundry 1b, etc., which drains relatively high concentration wastewater, and an overflow port 6a of the septic tank 6 connected to the toilet 1d is installed in the middle of the pipe 5. The pipe 5 is branched and connected, and the tip of the pipe 5 faces an organic water supply 8 which is a public sewer outside the mansion via a flow meter 7.

Here, for example, the bathroom 1a or the laundry 1
The relatively low concentration wastewater a discharged from the tank b is treated in a contact oxidation tank 3 with a branch pipe 2 for a contact time of about one day. This contact oxidation tank 3 is
As shown in FIG. 2, it consists of a coarse dirt removal net box 3a, a sedimentation tank 3b, and a contact material tank 3c. For example, if the bath water is 100%/day/person and the laundry rinse water is 50%/day/person, the length is 1.0m x depth 0.8m x width.
In the settling tank 3b of 0.5 m, approximately 15% of the inflow water is removed after 0.5 days of retention, and the BOD becomes about 30 to 50 ppm. In 0.5 days, the removal rate will be approximately 60%, and the final discharged water quality will be approximately BOD 12 to 20 ppm.

The purified water treated in this way (treated water) can be directly discharged into the side gutter 4, resulting in a waterway that does not run dry and a well-hydrated community.

On the other hand, high-concentration wastewater b discharged from the kitchen 1c, laundry 1b, etc. (however, in the laundry 1b, rinse water and dirty water can be separated by using a switching valve or by directly distributing water through branch pipes 2 and 5, respectively. ), and the organic water is discharged into the organic water supply 8 through a separate branch pipe 5 separated from the above. In this case, since the flowmeter 7 is disposed in the branch pipe 5, only the amount flowing into the organic water supply 8 can be reliably ascertained.

Furthermore, human waste c from the toilet 1d also flows into this branch pipe 5. That is, so-called human waste c such as urine and feces discharged from the toilet 1d is immediately led to a nearby septic tank 6 and stored in the septic tank 6 for about 100 days, where the effects of the fermentation accelerator are not affected. This overflow port 6a is rotten to a considerable extent and made sterile and odorless.
It is then dropped into the branch pipe 5. Of course, if such a septic tank 6 that becomes a private septic tank is provided, this overflow tank section 6
The draining lid 6c in b is removed, and the sterile and odorless night soil c can be pumped out as needed and used as organic fertilizer for fields A, etc. (it is also ideal for rural villages). Moreover, if this septic tank 6 is provided at the shortest distance from the toilet 1d, the amount of flushing used in the toilet 1d can be minimized, leading to economical use of water and downsizing of the septic tank.

<Effects of the Invention> As described above, the ultra-separate sewage treatment method of the present invention separates domestic wastewater into low-concentration sewage and high-concentration sewage in each household with its own separate pipes, and Low-concentration wastewater can be directly discharged into nearby gutters or waterways by simply passing through a contact oxidation tank or the like for simple purification, thereby making it possible to immediately reuse the water that constantly moistens the waterways. Of course,
This simple water treatment tank is not limited to the catalytic oxidation tank shown in the figure, but may be of other types. In addition, by adopting a method in which only highly concentrated sewage (including human waste) is discharged into the organic water supply that goes to the public sewage treatment plant, the pipe for the organic water supply only needs to be of the smallest diameter.
Construction costs, management costs, etc. are reduced compared to conventional pipes that simply collect all wastewater. Moreover, by locating the septic tank near the toilet, the conditions for transporting the feces by water are minimized, and the amount of water used for flushing is also minimized, resulting in a water-saving type of system. Of course, if the wastewater from the kitchen etc. is passed through a simple net (not shown), the amount of floating substances in the wastewater will be reduced to a minimum, and the amount of wastewater flowing into the treatment plant can be minimized. Furthermore, human waste is made sterile in advance in the septic tank, so sterilization at the treatment plant is also omitted.

Furthermore, the advantage of the method of the present invention is that only the amount of sewage flowing into the organic water supply can be measured using a flowmeter, so the actual sewerage usage fee is calculated (until now, the sewerage fee was based on the amount of water used). Since it was considered the amount of sewage water, it was inconvenient that all the water that did not flow directly into the sewer, such as when watering the garden, was converted into the amount.)
It has the following effects.

[Brief explanation of drawings]

The drawings show the apparatus used in the method of the present invention; FIG. 1 is a layout diagram, FIG. 2 is an explanatory diagram of a contact oxidation tank serving as a simple water treatment tank, and FIG. 3 is an explanatory diagram of a septic tank. 1...house, 1a...bathroom, 1b...laundry place,
1c...Kitchen, 1d...Toilet, 2...Diversion piping,
3...Contact oxidation tank, 4...Gutter, 5...Diversion piping, 6...Septic tank, 7...Flow meter, 8...Organic water supply.

Claims (1)

[Claims] 1. Among domestic wastewater discharged from households, low-concentration wastewater such as bathroom water and laundry rinse water is
Using dedicated piping via a switching valve, the water is directly discharged into gutters and waterways through a simple water treatment tank that serves as a contact oxidation tank, creating a never-depleting water flow, and at the same time, the human waste discharged from the toilet is first putrefied in a septic tank. Sterile,
A super-separated wastewater system characterized in that the odorless and highly concentrated overflow is made to flow into an organic water supply pipe dedicated to wastewater in a separate pipe together with highly concentrated dirty water from the kitchen and laundry drained by switching the switching valve. Water treatment methods.