JP2002239591A - Method for treating sewage of circulating flash toilet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating sewage of a circulating flash toilet solving the problem that a flash toilet requires a large quantity of washing water. SOLUTION: In the circulating type flash toilet for treating excretion sewage in an excretion cleaning tank according to an aerobic biological treatment method and using the cleaned excretion sewage as the washing water of the toilet, bacillus bacteria and photosynthetic bacteria are charged in the excretion cleaning tank and excretion sewage is cleaned while irradiated with visible light to enhance the cleaning ratio of excretion and the generation of a malodor is prevented and the formation amount of excess sludge is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying sewage of a circulating flush toilet set up in an outdoor work place, a construction site, a trade fair, an exposition hall, a seawater rakoba, a concert event hall, and the like.

[0002]

2. Description of the Related Art Washing toilets occupy the majority of Japanese toilets in terms of cleanliness and comfort. However, flush toilets require more than 8 liters of water when flushing manure only once.
Usually, such flush toilets are used in outdoor workplaces, construction sites,
It is difficult to set up in places where water is difficult to access, such as trade fairs, exposition halls, bathhouses, concerts and event venues,
The flush toilet is provided with a septic tank for treating human waste by aerobic biological treatment, and this is made possible only by a circulating flush toilet that reuses purified human waste water as toilet flush water. However, even with this type of circulating flush toilet, if the purification of human waste is insufficient, the flush water becomes polluted and emits an offensive odor, and the excess sludge generated by the purification increases and the frequency of pumping the toilet increases. There are, in particular,
Recycling-type flush toilets installed at trade fairs and expo halls where the number of visitors fluctuates greatly can not follow the purification function of the septic tank, which has the problem of impairing the cleanliness and comfort that are the advantages of flush toilets. .

[0003]

The human waste septic tank installed in the circulating flush toilet is treated by the activated sludge method. The purification of human waste by the activated sludge is performed by the aerobic bacteria constituting the activated sludge. Plays a role. That is, when human waste and activated sludge are brought into contact with each other while supplying sufficient oxygen, the soil in the human waste is adsorbed by the floc-forming bacteria formed from tens of types of soil bacteria, and the soil bacteria are used as a nutrient source for the soil bacteria. Proliferate and be purified. This activated sludge method is composed of an aeration tank for purifying activated sludge while supplying oxygen, and a sedimentation tank for settling and separating activated sludge to separate purified water and solids from solid and liquid. The activated sludge settled in the tank is returned to the aeration tank so that the activated sludge sensitivity in the aeration tank is kept constant. In order to operate the septic tank treated in this way efficiently, it is important to maintain the equilibrium between the adsorption and decomposition of filth biochemically. If it becomes lighter, the sedimentation becomes worse, and if the decomposition proceeds too much, the sludge disperses and the sedimentation and adsorption capacity decrease,
Clear treated water cannot be obtained. The generation of offensive odor and the increase in the amount of excess sludge occurring in the circulation type flush toilet are due to such modulation of activated sludge in the septic tank. The cause is largely due to the fluctuation of the load due to the increase and decrease of the amount of waste. However, temporary toilets set up at trade fairs and fairgrounds are unavoidable because of the fluctuations in septic tank load that accompany changes in the number of crew members. In order to solve such a problem, the present inventors have carried out research to maintain the function of activated sludge and to be resistant to load fluctuations, and as a result, have been able to develop the present invention.

[0004]

The sewage treatment method for a circulating flush toilet according to the present invention, which has solved the above-mentioned problems, comprises treating sewage wastewater by an aerobic biological treatment method in a sewage treatment tank, and removing the purified sewage wastewater. In a circulating flush toilet using the toilet flush water, Bacillus bacteria and photosynthetic bacteria are administered to a human waste septic tank, and purified while irradiating with visible light to improve the purification rate of human waste and prevent the generation of offensive odors. It is characterized in that the amount of excess sludge generated is reduced.

[0005] Bacillus bacteria are endophytic spores in bacteria, are rod-shaped cells, are aerobic or anaerobic heterotrophic bacteria, and Bacillus. Subtil
is (Bacillus subtilis). This Bacillus is characterized by the formation of thermostable spores and the cell division and proliferation at a very fast rate when fed.
The ability to assimilate and decompose organic matter is very high, but conversely, when the nutritional state deteriorates, spores are formed in the cells and a high bacterial concentration (109 cells / cc) can be maintained even in an oligotrophic state. By utilizing Bacillus bacteria having such characteristics as activated sludge bacteria, it becomes possible to cope with fluctuations in the quality of human wastewater.

[0006] Photosynthetic bacteria are a kind of sulfur bacteria that inhabit the hydrosphere and are distributed in the anaerobic layer in water in nature.
It grows by performing oxygen-free photosynthesis using light as an energy source, and has an advanced denitrification function. This photosynthetic bacterium can be classified into a red sulfur bacterium involving sulfur, a green sulfur bacterium, and a red non-sulfur bacterium not involving sulfur.Bacteria used as activated sludge for human waste treatment are either anaerobic or aerobic. Red non-sulfur bacteria that can grow even under the environment of the present invention are particularly preferable, and typical examples thereof are Rhodopseudomonas and Rhodospi-ri.
llum and Rhodomicrobium. Since photosynthetic bacteria grow under photosynthesis, they need light to grow, but red non-sulfur bacteria can oxidize organic matter and acquire energy under aerobic conditions without light under aerobic conditions. Can grow like heterotrophic bacteria.

[0007] When Bacillus is administered to a human waste septic tank, the Bacillus is activated immediately in response to the organic matter contained in the night soil, but when the amount of the organic matter is large, the Bacillus grows at a very high speed and can cope with a high load. . Also, when photosynthetic bacteria are administered to the night soil septic tank, malodor components such as ammonia, hydrogen sulfide, mercaptan, and lower fatty acids generated in the process of night soil rot are absorbed, decomposed and removed. Since the effect is higher when light is applied than when light is not applied, treatment is performed while irradiating the septic tank with visible light.

In the present invention, it is important that Bacillus bacteria and photosynthetic bacteria coexist in the activated sludge in the septic tank.
In particular, when photosynthetic bacteria coexist with heterotrophic bacteria, the functions of nitrogen fixation and decomposition of organic matter are enhanced by the biochemical metabolism of biochemical energy substances such as ATP and ADP secreted by the photosynthetic bacteria. Bacillus bacteria that coexist with
The amount of excess sludge generated is reduced. Activated sludge is purified by the adsorption of sewage in human waste to floc-forming bacteria such as Zoogloea and Escherichia, so the amount of sludge generated is 30% or more of the amount of sewage, but Bacillus and photosynthetic bacteria coexist Activated sludge is less than 10%. Therefore, in the present invention, it is an important requirement that bacillus bacteria and photosynthetic bacteria be administered and coexist in the human waste septic tank.

[0009]

Next, the method of the present invention will be described with reference to the drawings. Flush toilet 1, sewage receiving tank 2, screen 3,
In a well-known circulation type flush toilet as shown in FIG. 1 composed of a human waste purification tank 4, a sedimentation tank 5, a water supply tank 6, and a storage tank 7, manure received in the flush toilet 1 is supplied from a line 15. It is washed away by human waste purified water,
It is sent to the sewage receiving tank 2 via the line 16. In the sewage receiving tank 2, a degassing pipe 26 is installed. In the sewage receiving tank 2, the human wastewater is agitated by air (nu) sent from the blower 18 via the line 19 and the line 25, and organic matter in the wastewater is hydrolyzed. Decompose and solubilize. When the solubilized sewage aerated liquid (c) is pumped by a pump 8 and hanged on a screen 3 via a line 9, solids such as dust paper and absorbent cotton in the sewage are removed as scum (h), and the scum is removed. The removed sewage is sent to the septic tank 4 via the line 17.

The above-mentioned human waste purification tank 4 is provided with an air diffuser 27 for biochemically treating human waste water, and is stirred by air (nu) supplied from the blower 18 through the lines 19 and 23. However, the activated sludge that grows in the human waste septic tank 4 contains 0. 4-0. It is adjusted to a solids concentration of 6%, where organics are removed by adsorption and oxidative decomposition. When this activated sludge (d) is introduced into the sedimentation tank 5 from the line 10 under natural flow, the activated sludge having a high specific gravity is settled and separated and accumulates at the bottom of the sedimentation tank 5. The settled sludge is pumped up by operating the air lift 11 by air (nu) supplied from the prower 18 through the line 23, and returned to the urine purification tank 4 through the line 32. By this operation, the activated sludge in the human waste purification tank 4 is maintained.
Next, the clarified water separated from the sedimentation tank 5 is received in the water supply tank 6 via the line 13 and stored therein, and the purified water stored therein is pumped by the pump 14 to be used as washing water for manure (li). Then, the water is supplied from the line 15 to the flush toilet 1.

In this series of methods, the purification function of the activated sludge held in the night soil purification tank 4 plays an important role.
Activated sludge is composed of various aerobic bacteria, and the amount of food (organic matter in manure) given to the aerobic bacteria,
It is important to balance the number of aerobic bacteria retained in the aeration tank and the three components of oxygen supply to promote the growth of aerobic bacteria. For this purpose, in the method of FIG. 1, in order to keep the amount of sewage sewage supplied as food for aerobic bacteria constant, the hydrolyzed sewage aeration liquid (c) is quantitatively supplied to the purification tank 4 by the pump 8. ing. Then, the amount of air (nu) is adjusted by the valve 21 so that the amount of oxygen given to the activated sludge (d) is optimized. Further, in order to extract the increased amount of activated sludge (d), excess sludge (g) is taken out from the sedimentation tank 5 to the storage tank 7 via the line 12.

If the state of the activated sludge (d) is poor, the quality of the purified water will be poor, and the toilet will have a bad smell. Also,
The amount of excess sludge also increases. Such modulation of activated sludge (d) is largely due to fluctuations in the quantity and quality of manure (li). In particular, in the sewage receiving tank 2 that hydrolyzes manure (li),
In the course of hydrolysis, spoilage bacteria proliferate, producing odor components such as ammonia, hydrogen sulfide, indole, skatole, mercaptan, volatile amines, and fatty acids, which are the source of malodor in toilets. The administration of Bacillus bacteria and photosynthetic bacteria to such a circulating flush toilet improves these problems.

According to this method, Bacillus bacteria and photosynthetic bacteria are administered to a human waste septic tank treated by the activated sludge method. First, when the bacillus (a) is administered to the sewage receiving tank 2, spores of the bacillus germinate in the sewage receiving tank 2,
It grows with nutrients from the organic matter in night soil. Its growth rate of Bacillus fast higher the concentration of organic substances as a nutrient, initially 10 ³ cells / ml approximately a was the bacteria number, a 10 ⁹ cells / ml to about 5 days in human waste more than 1% BOD Also reach. Such a rapid growth of Bacillus bacteria rapidly purifies night soil with a high BOD. Then, when photosynthetic bacteria (B) are fed to the wastewater receiving tank 2, the lower fatty acids produced by Bacillus bacteria are fed. The photosynthetic bacteria (b) grow and adsorb unpleasant odor components generated during the purification process, and are decomposed and removed. At this time, the Bacillus bacteria and the photosynthetic bacteria grown in the sewage receiving tank 2 are transferred to the human waste purification tank 4 by the pumping of the wastewater aeration liquid (c) by the pump 8, so that they become a group of activated sludge (d) and purify the human waste. continue.

In activated sludge in which Bacillus bacteria and photosynthetic bacteria coexist, the rate of oxidative decomposition of organic substances adsorbed by activated sludge is improved, and the amount of excess sludge generated is reduced. Also,
Activated sludge in which Bacillus bacteria and photosynthetic bacteria coexist consumes less oxygen. In the ordinary Kisa sludge method, the amount of air is adjusted so that the dissolved oxygen concentration in the human waste septic tank 4 is maintained at 3 to 5 ppm. However, the dissolved oxygen concentration is about 1 to 2 ppm in activated sludge where Bacillus bacteria and photosynthetic bacteria coexist. Therefore, the valve 21 is adjusted to reduce the amount of air. Since the photosynthetic bacterium works well when irradiated with visible light, an electric lamp 28 and an electric light 29 are installed in the sewage receiving tank 2 where the photosynthetic bacterium inhabits and the urine purification tank 4, and electricity is supplied from the electric wirings 30 and 31 to emit light. It is good to brighten the inside of the tank.

The Bacillus bacterium utilized in the present invention may be any gram-positive aerobic spore-forming bacterium that is compatible with the water environment, and Bacillus. Su
btilis (Kingus fungus) is known, but Ba grows at low temperature.
cillus. globisporus or Ba, known as a thermophilic bacterium
ci11us. StearothermoPhilus can also be used. In addition,
The number of Bacillus bacteria administered to the night soil purification tank 4 is not limited, but the number of Bacillus bacteria administered is 1 × 10 5 in the wastewater receiving tank 2.
^It is more preferable to adjust the amount to be ³ particles / ml or more.

As described above, the photosynthetic bacterium utilized in the present invention is particularly suitable for a red non-sulfur bacterium which inhabits by photosynthesis in an anaerobic and aerobic environment as described above. Representative examples thereof include Rhodopseudomonas and Rhodospi. -rillum, Rhodom
There is icrobium. Although the number of photosynthetic bacteria to be administered to the night soil purification tank is not limited, it is more preferable to adjust the number of bacteria to be administered to the wastewater receiving tank 2 to be 1 × 10 ³ cells / ml or more.

Since photosynthetic bacteria do not grow in an anaerobic dark environment, they may be sterilized by feeding on heterotrophic bacteria in a septic tank with a small amount of light, and must be supplemented to eliminate the adverse effects. . The frequency depends on the optical conditions of the septic tank, but is empirically about once a month.

[0018]

Next, the details of the present invention will be described with reference to examples, but it goes without saying that the present invention is not limited to these examples. . As a temporary toilet at the construction site of the road laying, a circulating flush toilet for about 50 workers constructed by the process shown in FIG. 1 was set up. This circulation type flush toilet was operated by the activated sludge method at first, but since the number of workers has increased to about 100, the amount of manure has doubled, the purification function has been reduced, and various adverse effects will occur. Became. The adverse effects were, for example, the deterioration of the water quality of the purified water and the generation of odor caused by the deterioration of the water quality, and an increase in the amount of excess sludge. In the early days when the number of workers was 50, the quality of purified water was B0D 80 to 120 pp.
m range, but the BOD
160 to 450 ppm. As a result, the odor coming from the flush toilet is 2 ppm or less of ammonia and 0. Ten . 2 ppm, methyl mercaptan 0. 0
2 to 0. 6 ppm to 15 pp ammonia
m, hydrogen sulfide 1-3 ppm, methyl mercaptan 1-2 pp
m. And the frequency of pumping excess sludge is also 3
What was once a month has become a frequency once a month. In view of the above, the sewage receiving tank 2 of the circulation type flush toilet and the 100W electric lights 28 and 29 are mounted on the upper part of the human waste purification tank 4 in the situation as described above.
Bacillus bacterium and photosynthetic bacterium equivalent to 1/00 were administered, and the urine treatment was continued while irradiating the light with the electric lights 28 and 29. One month later, the water quality of the purified water was 60 pp BOD.
m or less, and the unpleasant odors coming from the flush toilet 1 were also 0.5 ppm or less for ammonia, 0.001 ppm or less for hydrogen sulfide, and 0.0002 ppm or less for methyl mercaptan. And the extraction of excess sludge has been reduced to once every six months. The Bacillus used in this example was thermophilic Bacillus Bacillus. Stearothemophi
lus. The photosynthetic bacterium is a purely cultured red non-sulfur bacterium collected from a paddy field, and the bacterial species is Rhodopseudomonas. capsulata.

[0019]

As apparent from the above description, the present invention provides:
The human wastewater is treated by an aerobic biological treatment method in a human wastewater purification tank, and in a circulation type flush toilet using the purified human wastewater as a flushing water for the toilet, Bacillus bacteria and photosynthetic bacteria are administered to the human wastewater purification tank and irradiated with visible light. As it purifies the wastewater, it improves the purification rate of human waste, prevents the generation of offensive odor, and reduces the amount of excess sludge generated. Improves the quality of human waste water by resolving all problems, such as being less susceptible to load fluctuations in recirculating flush toilets that overcome the biggest problems, generating bad odors when the purification function deteriorates, and increasing the frequency of sludge pumping. As a result, an unpleasant odor could be prevented, and the amount of excess sludge could be reduced. Therefore, the present invention is extremely effective in developing a circulating flush toilet set up in an outdoor work place, a construction site, a trade fair, an exposition hall, a beach, a concert / event hall, and the like.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 flush toilet 2 sewage receiving tank 4 human waste purification tank 5 sedimentation tank 6 water supply tank 7 storage tank 11 air lift 18 blower 26 diffuser tube 27 diffuser tube 28 electric light 29 electric lamp ivanarusu bacteria mouth photosynthetic bacteria c sewage aeration liquid d activated sludge sedimentation liquid To purified water G surplus sludge

Claims (4)

[Claims] Claims: 1. A circulating flush toilet using human waste soil treated by an aerobic biological treatment method in a human waste septic tank and using the purified human waste water as a toilet flush water, wherein Bacillus bacteria and photosynthetic bacteria are administered to the human waste septic tank; A sewage treatment method for a circulating flush toilet characterized by improving the purification rate of human waste by irradiating with visible light, preventing the generation of offensive odor, and reducing the amount of excess sludge generated. 2. The method for treating sewage in a circulating flush toilet according to claim 1, wherein the number of Bacillus bacteria administered to the human waste septic tank is adjusted to 1 × 10 ³ / ml or more in the sewage receiving tank. 3. The method according to claim 1, wherein the photosynthetic bacterium to be administered to the human septic tank is a red non-sulfur bacterium. Red non-sulfur bacteria 4. The sewage of a circulating flush toilet according to claim 1 or 2, wherein the number of photosynthetic bacteria administered to the night soil septic tank is adjusted to 1 × 10 ³ / ml or more in the sewage receiving tank. Processing method.