TWI795608B - sewage treatment system - Google Patents

Abstract

The present invention provides a sewage treatment system capable of positively maintaining the dissolved oxygen concentration of sewage flowing down a sewer pipe downstream of a relay pumping station, while at the same time changing the microbial state of the inner wall of the sewer pipe and preventing corrosion of the sewer pipe. The sewage treatment system of the present invention is equipped with a relay pumping station and sewage treatment equipment for sewage discharged from households or factories/enterprises, and the sewage treatment equipment is equipped with an initial sedimentation tank, a biological treatment tank and a final sedimentation tank, And the sewage from the aforementioned relay pumping station is received through the sewer pipeline and treated, and the sewage treatment system is characterized in that it has: dehydration means, microbial material manufacturing equipment, water supply means, microbial activation means, and oxygen supply means , sending the sewage containing the activated microbial material and the oxygen supplied by the oxygen supply means from the aforementioned relay pumping station to the aforementioned sewage treatment equipment.

Description

sewage treatment system

The present invention relates to a sewage treatment system, more specifically, to a sewage treatment system provided with a relay pumping station and sewage treatment equipment for sewage discharged from households or factories/businesses, etc., the sewage treatment The equipment has an initial sedimentation tank, a biological treatment tank and a final sedimentation tank, and receives sewage from the aforementioned relay pumping station through the sewer pipeline and processes it.

According to the sewage treatment system of the present invention, for example, deterioration of the sewer pipe downstream of the relay pumping station can be prevented.

As a method of treating liquid to be treated such as waste water and sewage, activated sludge treatment in which liquid to be treated is treated with activated sludge is widely performed.

For example, as widely disclosed in Japanese Patent Application Laid-Open No. 2013-233482, etc., the wastewater treatment system using the activated sludge method basically consists of an initial sedimentation tank (in addition, it is sometimes omitted in small-scale sewage treatment systems), a reaction tank and the final sedimentation tank. Furthermore, according to the activated sludge method, after the raw sludge is separated from the wastewater supplied in the initial sedimentation tank, oxygen is dissolved by aeration/ventilation in the reaction tank for the wastewater supplied through the flow path, and simultaneously Stirring and mixing, after suspending the activated sludge mainly composed of aerobic microorganisms, the activated sludge is settled in the final sedimentation tank supplied through the flow path, and the supernatant water is discharged as effluent. The reaction tank is also called aeration tank, reaction tank, ventilation tank, biological treatment tank, etc., and the aeration time is 6 to 14 hours. Part of the activated sludge settled in the final sedimentation tank is returned to the reaction tank as return sludge, and the rest is concentrated as excess sludge by mechanical thickening equipment.

As described above, although a part of the activated sludge deposited in the final sedimentation tank is effectively used, it does not stop there.

In the sewer pipes, sewage from households or factories/businesses etc. flows in all the time. Among them, human intestinal bacteria and microorganisms (mainly bacteria) from factories will flow in together. Sewage The water will get oxygen from the air when it flows down the sewer pipe, but not only that, but the oxygen uptake by the aforementioned microorganisms is generally easy to cause anoxic state. As a result, sulfate-reducing bacteria, which are anaerobic bacteria, become active, decompose organic matter using sulfate, and generate hydrogen sulfide gas. The hydrogen sulfide gas produced is responsible for the foul smell of sewage and becomes a dangerous poisonous gas when workers enter from the manhole. Furthermore, when this hydrogen sulfide gas is dissolved in the water film existing on the wall above the sewer pipe space, sulfuric acid-producing bacteria proliferate in the biofilm in the water film to generate sulfuric acid, causing the cement wall of the sewer pipe to corrode, Concrete pipes can become degraded/disintegrated. Prolonging the life of concrete pipes which are foundations of sewers is an extremely important issue in the maintenance and management of urban infrastructure.

In order to solve this kind of problem, Japanese Patent Publication No. 3-55199 proposes a device in which an oxidation (oxygen addition) device is set in the middle of the sewer pipe, and the sludge in the sewage flowing down from the sewer pipe is put into the oxidizer , add oxygen to it, and return it to the sewage flowing down from the sewer pipe again, thereby positively maintaining the dissolved oxygen concentration of the sewage.

According to the device described in the aforementioned patent publication, although it is true that the dissolved oxygen concentration of the sewage in the sewer pipe can be maintained positively, it does not stop there.

[Prior art literature]

[Patent Document]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2013-233482;

[Patent Document 2] Japanese Patent Application Publication No. 3-55199.

Therefore, the object of the present invention is to further provide the sewage that can positively maintain the dissolved oxygen concentration of the sewage flowing down from the sewer pipeline downstream of the relay pump station, and at the same time change the microbial state of the inner wall of the aforesaid sewer pipeline, and prevent the corrosion of the sewer pipeline. water treatment system.

Another object of the present invention is to provide a sewage treatment system provided with a microbial material manufacturing device that processes activated sludge and further produces effectively functioning microbial materials in a bioreactor.

The said subject is achieved by the sewage treatment system of this invention which consists of following (1)-(30).

(1) A sewage treatment system having a relay pumping station for sewage discharged from households or factories/businesses, etc., and sewage treatment equipment, the aforementioned sewage treatment equipment having an initial sedimentation tank, a biological treatment tank, and final sedimentation pond, and receive the sewage from the aforementioned relay pumping station through the sewer pipeline, and treat it. The feature of the aforementioned sewage treatment system is that it has: a dehydration means, which is connected to the aforementioned initial sedimentation tank and/or final sedimentation tank, It is used to receive the excess sludge from the initial sedimentation tank and/or the return sludge from the final sedimentation tank and dewater it; the microbial material manufacturing device, for the dewatered sludge from the dewatering means, maintains the temperature at Oxygen is supplied at a temperature of 60°C to 110°C, so that the Gram-positive aerobic microorganisms in the aforementioned dewatered sludge undergo aerobic fermentation, thereby decomposing and killing the Gram-negative anaerobic microorganisms, and simultaneously producing Microbial material containing spores (spores) of aerobic microorganisms generated after the aerobic fermentation; water supply means, which are used to deliver water from any system in the sewage treatment system to the microbial activation device described later; microbial activation A device that receives the microbial material from the aforementioned microbial material manufacturing device, supplies the microbial material with water from the aforementioned water supply means, and at the same time maintains the temperature of the water in the range of 10 degrees to 40 degrees, and maintains the oxygen concentration at 1~ 10mg/L, to germinate and activate the aforementioned spores of the aforementioned microbial material; and oxygen supply means, which supply oxygen to the sewage at any position in the aforementioned relay pumping station; wherein, from the aforementioned relay pumping station will contain the aforementioned activated The microbial material and the oxygen-supplied sewage supplied by the aforementioned oxygen supply means are sent to the aforementioned sewage treatment facility.

(2) The sewage treatment system as described in said (1) which maintains the temperature of the water from the said water supply means in the range of 15 degreeC - 40 degreeC.

(3) The sewage treatment system according to (1) above, wherein the water has been treated by the sewage treatment facility.

(4) The sewage treatment system according to (3) above, wherein the sewage treatment facility is provided with a disinfection tank for sterilizing water from the final sedimentation tank, and the water is water before disinfection in the disinfection tank .

(5) The sewage treatment system according to (1) above, wherein the water is sewage upstream of the pump of the relay pump station.

(6) The sewage treatment system according to any one of (1) to (5) above, wherein the oxygen supply means supplies oxygen to the sewage in the pump of the relay pumping station.

(7) The sewage treatment system according to any one of (1) to (6) above, wherein the water from the water supply means has the nutrients necessary for the germination of the spores.

(8) The sewage treatment system according to any one of (1) to (7) above, wherein the aerobic microorganisms include Gram-positive bacteria belonging to the phylum Firmicutes, bacteria belonging to the phylum Actinomycetes At least one of Gram-positive bacteria of the class Actinomycetes and Gram-positive bacteria of the phylum Chloroflexi, and yeasts are also included.

(9) The sewage treatment system according to any one of the aforementioned (1) to (8), wherein the aforementioned anaerobic and facultative anaerobic microorganisms are Gram species including Proteobacteria present in the intestinal tract. negative sulfate-reducing bacteria and/or Gram-negative microorganisms of the phylum Bacteroidetes.

(10) A sewage treatment system with a relay pumping station and sewage treatment equipment for sewage discharged from households or factories/enterprises, the aforementioned sewage treatment equipment has at least an initial sedimentation tank, a biological treatment tank and a final The biological treatment tank and the final sedimentation tank in the sedimentation tank receive and treat the sewage from the aforementioned relay pumping station through the sewer pipeline. The initial settling tank and the final settling tank in the final settling tank are connected to at least receive the return sludge from the final settling tank among the remaining sludge from the initial settling tank and the return sludge from the final settling tank, and carry it out Dehydration: A microbial material manufacturing device that supplies oxygen while maintaining the temperature at 60°C to 110°C to the dewatered sludge from the dewatering means, and uses Gram-positive aerobic microorganisms in the dewatered sludge carrying out an aerobic fermentation whereby Gram-negative anaerobic and facultative anaerobic microorganisms decompose and die, and at the same time produce a microbial material containing spores of the aerobic microorganisms produced after the aerobic fermentation; The first water supply means, which is used to deliver water from any system in the sewage treatment system to the first microbial activation device described later; the first oxygen supply means, which is used to supply oxygen to the first microbial activation device described later; The first microorganism activation device, which receives the microbial material from the aforementioned microbial material manufacturing device, and receives the supply of oxygen from the first oxygen supply means and water from the first water supply means, and at the same time maintains the temperature of the water at 10 temperature to 40 degrees, maintain the oxygen concentration at 1-10 mg/L, germinate and activate the aforementioned spores of the aforementioned microbial material, and supply the activated microbial material to the aforementioned biological treatment tank; the second water supply means is used for The second microbial activation device described later transports water from any system in the sewage treatment system; the second oxygen supply means is used to supply oxygen to the second microbial activation device described later; and the second microbial activation device receives water from the aforementioned The microbial material of the microbial material manufacturing device receives the supply of oxygen from the second oxygen supply means and water from the second water supply means, and at the same time maintains the temperature of the water at 10 degrees to 40 degrees, and maintains the oxygen concentration at 1~10mg/L, to germinate and activate the aforementioned spores of the aforementioned microbial material, and supply the activated microbial material to the aforementioned relay pump station.

(11) The sewage treatment system according to (10) above, wherein the temperature of the water from the first water supply means and the second water supply means is maintained within a range of 15°C to 40°C.

(12) The sewage treatment system according to (10) or (11) above, wherein the oxygen from the first oxygen supply means and the second oxygen supply means is supplied in the form of air.

(13) The sewage treatment system according to any one of (10) to (12), wherein the water supplied to the first microbial activation device and the second microbial activation device is overflow water from the initial sedimentation tank .

(14) The sewage treatment system according to any one of the aforementioned (10) to (12), wherein the aforementioned water supplied to the aforementioned first microbial activation device and the second microbial activation device is the sewage before entering the aforementioned initial sedimentation tank. water.

(15) The sewage treatment system according to any one of the aforementioned (10) to (12), wherein the water supplied to the first microbial activation device and the second microbial activation device has passed through the aforementioned sewage treatment equipment treated water.

(16) The sewage treatment system according to (15) above, wherein the sewage treatment facility is provided with a disinfection tank for sterilizing the water from the final sedimentation tank, and the first microbial activation device and the second microbial activation The aforementioned water supplied by the device is the water before being sterilized in the sterilizing tank.

(17) The sewage treatment system according to any one of (13) to (16) above, wherein the water from the first water supply means and the second water supply means has the nutrients necessary for the germination of the spores.

(18) The sewage treatment system according to any one of the aforementioned (10) to (17), wherein the aerobic microorganisms include Gram-positive bacteria belonging to the phylum Firmicutes, bacteria belonging to the phylum Actinomycetes Gram-positive Actinomycetes and at least one of the Gram-positive bacteria of Chloroflexi, and yeasts are also included.

(19) The sewage treatment system according to any one of the aforementioned (10) to (18), wherein the aforementioned anaerobic and facultative anaerobic microorganisms are Gram species including Proteobacteria present in the intestinal tract. negative sulfate-reducing bacteria, and/or Gram-negative microorganisms belonging to the phylum Bacteroidetes.

(20) A sewage treatment system with a relay pumping station and sewage treatment equipment for sewage discharged from households or factories/enterprises, the aforementioned sewage treatment equipment at least has an initial sedimentation tank, a biological treatment tank and a final The biological treatment tank and the final sedimentation tank in the sedimentation tank receive and treat the sewage from the aforementioned relay pumping station through the sewer pipeline. The initial settling tank and the final settling tank in the final settling tank are connected to at least receive the return sludge from the final settling tank among the remaining sludge from the initial settling tank and the return sludge from the final settling tank, and carry it out Dehydration: A microbial material manufacturing device that supplies oxygen while maintaining the temperature at 60°C to 110°C to the dewatered sludge from the dewatering means, and uses Gram-positive aerobic microorganisms in the dewatered sludge carrying out an aerobic fermentation whereby Gram-negative anaerobic and facultative anaerobic microorganisms decompose and die, and at the same time produce a microbial material containing spores of the aerobic microorganisms produced after the aerobic fermentation; The first water supply means, which is used to deliver water from any system in the sewage treatment system to the first microbial activation device described later; the first oxygen supply means, which is used to supply oxygen to the first microbial activation device described later; the first A microorganism activation device, which receives the microbial material from the aforementioned microbial material manufacturing device, and receives the supply of oxygen from the aforementioned second oxygen supply means and water from the second water supply means, and at the same time maintains the temperature of the water at 10 degrees ~ 40 degrees, maintain the oxygen concentration at 1~10mg/L, germinate and activate the aforementioned spores of the aforementioned microbial material, and supply the activated microbial material to the aforementioned biological treatment tank; The 1st' microbial activation device, which receives the microbial material from the aforementioned microbial material production device, and receives the supply of oxygen from the aforementioned first oxygen supply means and water from the first water supply means, and at the same time maintains the temperature of the water at 10°C~40°C, maintain the oxygen concentration at 1~10mg/L, germinate and activate the aforementioned spores of the aforementioned microbial material, and supply the activated microbial material to the aforementioned biological treatment tank; the second water supply means is used for Transport the water from any system in the sewage treatment system to the second microbial activation device described later; the second oxygen supply means, which is used to supply oxygen to the second microbial activation device described later; and the second microbial activation device, which receives from For the microbial material of the microbial material manufacturing device, the microbial material is supplied with water from the second water supply means, and at the same time, the temperature of the water is maintained in the range of 10 degrees to 40 degrees, and the oxygen concentration is maintained at 1 to 10 mg/L , germinate and activate the aforementioned spores of the aforementioned microbial material, and supply the activated microbial material to the aforementioned relay pump station.

(21) The sewage treatment system according to (20) above, wherein the temperature of the water from the first water supply means and the second water supply means is maintained within a range of 15°C to 40°C.

(22) The sewage treatment system according to (20) or (21) above, wherein the oxygen from the first oxygen supply means and the second oxygen supply means is supplied in the form of air.

(23) The sewage treatment system according to any one of the aforementioned (20) to (22), wherein the water supplied to the first microbial activation device, the first microbial activation device and the second microbial activation device is from The overflow water of the aforementioned initial sedimentation tank.

(24) The sewage treatment system according to any one of (20) to (22) above, wherein the water supplied to the first microbial activation device, the first microbial activation device and the second microbial activation device is The sewage before the aforementioned initial sedimentation tank.

(25) The sewage treatment system according to any one of the aforementioned (20) to (22), wherein the aforementioned water supplied to the first microbial activation device, the first microbial activation device and the second microbial activation device has been Water treated by the aforementioned sewage treatment equipment.

(26) The sewage treatment system according to (25) above, wherein the sewage treatment equipment is equipped with a disinfection tank for sterilizing the water from the final sedimentation tank, and the first microbial activation device, the first microorganism The aforementioned water supplied by the activation device and the second microorganism activation device is water before disinfection in the disinfection tank.

(27) The sewage treatment system according to any one of (20) to (26) above, wherein the water from the first water supply means and the second water supply means has the nutrients necessary for the germination of the spores.

(28) The sewage treatment system according to any one of (20) to (27) above, wherein the aerobic microorganisms include Gram-positive bacteria belonging to the phylum Firmicutes and bacteria belonging to the phylum Actinomycetes. At least one of Gram-positive Actinomycetes and Chloroflexi gram-positive bacteria, and yeasts are also included.

(29) The sewage treatment system according to any one of the aforementioned (20) to (27), wherein the aforementioned anaerobic and facultative anaerobic microorganisms are Gram species including Proteobacteria present in the intestinal tract. negative sulfate-reducing bacteria, and/or Gram-negative microorganisms belonging to the phylum Bacteroidetes.

In the sewage treatment system of the present invention, a microbial material manufacturing device is provided, and the dewatered sludge comprising excess sludge from the initial sedimentation tank and/or return sludge from the final sedimentation tank is treated by the microbial material manufacturing device, By producing microbial materials containing spores of aerobic microorganisms and supplying them to the sewage at the relay pumping station in an activated state, the bacterial conditions on the wall of the sewer pipe starting directly below the relay pumping station can be improved to Good condition, thereby preventing corrosion of sewer pipes and prolonging life.

In the sewage treatment system of the present invention, a microbial material production device is provided so that microorganisms useful for sewage treatment mainly exist in the form of spores, and the microbial material produced by the microbial material production device is germinated by the aforementioned microbial activation device , and useful microorganisms for the decomposition of organic matter in sewage, that is, bacteria belonging to the Gram-positive Bacillus class of Firmicutes, and/or bacteria belonging to the Gram-positive Actinomycetes class of Actinomycetes, and / or Gram-positive bacteria of the Chloroflexi phylum are in an abundant state. According to the above, since the treatment in the biological treatment tank is carried out by the microorganisms from the activated sludge and the microorganism activation device, it is possible to decompose the organic matter of the sewage sludge very efficiently.

Usually, in the bacterial phase of activated sludge, Proteobacteria, Bacteroidetes, etc. are the most, but among the microbial materials in the sewage treatment system of the present invention, bacteria belonging to the Gram-positive Bacillus class of Firmicutes, The presence of Gram-positive Actinomycetes belonging to the phylum Actinobacteria and Gram-positive bacteria of the phylum Chloroflexi is in an abundant state (for example, among the microorganisms in the microbial material, more than 50% of actinomycetes are contained , more than 20% of Firmicutes, more than 10% of Chloroflexi) exist, so in the activated sludge biological treatment tank, even if the presence of the aforementioned Proteobacteria, Bacteroidetes, etc. decreases, the concentration of activated sludge MLSS increases To operate at 2000-4000mg/L, because the activated sludge has good settling property and BOD reduction, it can be stably purified Therefore, for the previous problems, namely (1) improvement of puffing problem, (2) improvement of nitrification and denitrification, (3) improvement of dephosphorization treatment and (4) improvement of foaming/scum problem in the final sedimentation tank All valid.

10: Sewage treatment system

20: Relay pumping station

50: Sewage treatment equipment

52: Initial sedimentation tank

54: Biological treatment tank

56: Final sedimentation tank

58: Disinfection tank

60: Dehydration device

62: Microbial material manufacturing device

70: Microbial activation device

72: water supply means

74: Oxygen supply means

100: sewer pipes

110: Sewage treatment system

170: The first microbial activation device

172: The first means of water supply

174: The first means of oxygen supply

180: The second microorganism activation device

182: Second water supply means

184: Second means of oxygen supply

P: pump

FIG. 1 is a conceptual diagram showing the composition of a sewage treatment system according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing the composition of a sewage treatment system according to another embodiment of the present invention.

Hereinafter, a sewage treatment system 10 according to an embodiment of the present invention will be described with reference to the drawings.

The sewage treatment system 10 is equipped with a relay pumping station 20 and a sewage treatment equipment 50 for sewage discharged from households or factories/enterprises, etc. sewage and treat it. Similar to equipment based on the usual activated sludge method, this sewage treatment equipment 50 has an initial sedimentation tank 52, a biological treatment tank (aeration tank) 54, a final sedimentation tank 56, and a disinfection tank 58, and the sewage is purified through the above components , disinfection, and discharge through sewer pipes. The above-mentioned configuration of the sewage treatment facility 50 is a common configuration in the sewage treatment system 10 of this type, so a more detailed description thereof will be omitted. Moreover, the relay pumping station 20 is equipped with the pump P connected to the sewer pipe extending from each household, factory, etc.

The aforementioned sewage treatment system 10 is further equipped with a dewatering device 60, which is connected to the aforementioned initial sedimentation tank 52 and final sedimentation tank 56, and is used to receive excess sludge from the initial sedimentation tank and return sludge from the final sedimentation tank, and dehydrate it. In this dehydrator 60, only one of the above-mentioned excess sludge and return sludge may be received and dehydrated. As this dehydration device 60, it can be a device that performs any form of dehydration methods such as centrifugal separation type, filter press type, mechanical concentration type, etc. By this dehydration device 60, the aforementioned excess sludge and/or return sludge are made into water-containing Dewatered sludge with a rate of 65~85%.

To this dehydration device 60, a microbial material production device 62 is connected. This microbial material manufacturing device 62 supplies oxygen to the dewatered sludge from the dewatering device 60 while keeping the temperature at 60°C to 110°C, so that the Gram-positive aerobic microorganisms in the dewatered sludge are well aerobic fermentation. Through this aerobic fermentation, Gram-negative anaerobic microorganisms are decomposed and killed, and at the same time, the water and nutrients in the dewatered sludge consumed in this aerobic fermentation are depleted, thereby aerobic microbes Spores are formed by living organisms, and this effect is utilized to produce microbial materials that contain spores of beneficial aerobic microorganisms as little as possible containing harmful Gram-negative anaerobic and facultative anaerobic microorganisms. This microbial material manufacturing apparatus 62 is equipped with a heater for the above-mentioned temperature management, and also includes an oxygen (air) supply device as necessary.

In addition, in the prior art (refer to Japanese Patent Application Laid-Open No. 2001-271510), there is a technique of directly adding a fermented product (for fertilizer) which is almost equivalent to the microbial material of the present invention to sewage sludge, but the purpose is to promote The purpose of sedimentation of activated sludge is different from the purpose of the present invention. Also, starting from the aforementioned prior art, it is also conceivable to directly add the fermented product to the aforementioned bioreactor, but there are a large number of other microorganisms (Gram-negative bacteria, etc.) that consume nutrients preferentially in the aforementioned bioreactor, and are used for the production of spores. Germinated nutrients and the like are exhausted or reduced, and therefore, spores directly added to the bioreactor do not germinate or require a long time to germinate. Therefore, it is considered that the exertion of the sewage treatment function of useful microorganisms is limited.

The sewage treatment system 10 of this embodiment includes a microorganism activation device 70 installed or connected to the aforementioned relay pump station 20 . The microorganism activation device 70 is connected with a water supply means 72 for delivering water from any system in the sewage treatment system to the microorganism activation device 70 , and an oxygen supply means 74 for delivering oxygen to the microorganism activation device 70 . The water supplied as the aforementioned water supply means 72 is preferably the sewage before receiving treatment (for example, the sewage upstream of the pump P of the aforementioned relay pumping station 20) or the final sedimentation tank 56 flowing out from the disinfection tank 58. water. These waters contain the nutrients necessary for the germination of the aforementioned spores, and can simultaneously provide the moisture and nutrients necessary for the germination of the spores.

In addition, the oxygen supplied from the oxygen supply means 74 may be supplied in the form of air. In this case, there is no need to specially set up an oxygen generating device or an oxygen tank. Also, when the oxygen concentration in the sewage is considered to be sufficient for germination, air may also be introduced into the sewage in the aforementioned pump P or the sewage just discharged from the pump P.

The aforementioned microbial activation device 70 receives the microbial material from the aforementioned microbial material manufacturing device 62, supplies the microbial material with water from the aforementioned water supply means 72, and at the same time maintains the temperature of the water in the range of 10 degrees to 40 degrees, and lowers the oxygen concentration. Maintain at 1~10mg/L to germinate and activate the aforementioned spores of the aforementioned microbial material. In order to maintain the aforementioned water temperature within the aforementioned range, cooling and heating equipment may also be provided. In addition, in order to maintain the oxygen concentration within the aforementioned range, oxygen (air) is supplied from the aforementioned oxygen supply means 74 . Oxygen (air) from the aforementioned oxygen supply means 74 is also supplied to the sewage at any one of the aforementioned relay pumping stations 20 to increase the amount of dissolved oxygen in the sewage. In addition, in this microorganism activation device 70, the spores usually germinate after more than 5 minutes after the germination environment is ready, so it is relatively Preferably, the microbial material stays in the microbial activation device 70 for more than 5 minutes before being put into sewage (such as the sewage in the aforementioned pump).

With the above configuration, in the sewage treatment system 10, in the sewer pipe downstream of the relay pumping station 20, regardless of the oxygen consumption of the germinated aerobic microorganisms and the aerobic microorganisms originally present in the sewage, All of the sewage is in a state in which sufficient oxygen is dissolved and present (a state in which the oxygen concentration is increased).

As a result of the increase in the oxygen concentration of sewage, the inactivation of sulfate-reducing bacteria which are anaerobic bacteria, and the suppression of hydrogen sulfide production, the production of sulfuric acid can be prevented by the inhibition of sulfuric acid-producing bacteria, and at the same time by good Oxygen microorganisms improve the bacterial condition in the biofilm on the wall of the sewer pipe starting directly below the relay pumping station to a good state where no sulfuric acid-producing bacteria exist, thereby preventing the generation of sulfuric acid, preventing corrosion of the sewer pipe, and prolonging life. And at the same time, the purification of the sewage itself can be realized through the activities of the aforementioned aerobic microorganisms, reducing the burden on subsequent equipment.

Hereinafter, a sewage treatment system 110 according to another embodiment of the present invention will be described with reference to FIG. 2 . Descriptions of components/members described with reference to FIG. 1 are omitted.

The sewage treatment system 110 includes a first microorganism activation device 170 installed or connected to the sewage treatment facility 50 . The microorganism activation device 170 is connected with a first water supply means 172 for delivering water from any system in the sewage treatment system to the microorganism activation device 170 . To this microorganism activation device 170, the 1st oxygen supply means 174 for sending oxygen to this microorganism activation device 170 is connected as needed. The water supplied as the first water supply means 172 is preferably the sewage before treatment (for example, the sewage upstream of the pump P of the aforementioned relay pumping station 20), from the final sedimentation tank 56 before the disinfection tank 58 outflow of water. These waters contain the nutrients necessary for the germination of the aforementioned spores, and can simultaneously provide the moisture and nutrients necessary for the germination of the spores.

When the amount of dissolved oxygen in water from the first water supply means 172 is insufficient, oxygen is supplied from the first oxygen supply means 174 . This supplied oxygen may be supplied in the form of air. In this case, there is no need to specially set up an oxygen generating device or an oxygen tank.

The aforementioned first microorganism activation device 170 receives the microbial material from the aforementioned microbial material manufacturing device 62, supplies the microbial material with water from the aforementioned first water supply means 172, and simultaneously maintains the temperature of the water in the range of 15°C to 40°C 1. Maintain the oxygen concentration at 1-10 mg/L to germinate and activate the aforementioned spores of the aforementioned microbial material. In order to maintain the aforementioned water temperature within the aforementioned range, cooling and heating equipment may also be provided. Also, in order to maintain the oxygen concentration within the aforementioned range, the Oxygen (air) supply of the oxygen means 174 . In addition, in the microorganism activation device 170, the spores germinate more than 5 minutes after the germination environment is prepared, so they stay in the microorganism activation device 170 that does not contain Gram-negative bacteria that compete with microbial materials as much as possible. Put into the biological treatment tank 54 again more than 5 minutes.

With the above configuration, in the sewage treatment system 110, microorganisms (aerobic) formed by germinating spores in the microbial material from the microbial material manufacturing device 62 in the biological treatment tank 54 are additionally supplied to normal activated sludge , together with the useful microorganisms in the activated sludge, it can effectively decompose the organic matter in the sewage.

In addition, in the present invention, the aerobic microorganisms include, for example, Gram-positive bacteria belonging to the phylum Firmicutes, and/or bacteria belonging to the gram-positive Actinomycetes belonging to the phylum Actinomycetes, Furthermore, yeast may be mentioned depending on the case.

On the other hand, examples of the above-mentioned anaerobic and facultative anaerobic microorganisms include microorganisms of Gram-negative sulfate-reducing bacteria of the phylum Proteobacteria present in the intestinal tract, and/or microorganisms of the phylum Bacteroidetes. Gram-negative microorganisms.

This sewage treatment system 110 further includes a second microorganism activation device 180 installed or connected to the aforementioned relay pump station 20 . This microorganism activation device 180 is connected with the second water supply means 182 for delivering water from any system in the sewage treatment system to the second microorganism activation device 180, and for delivering oxygen to the second microorganism activation device The second oxygen supply means 184 of 180 . The water supplied as the aforementioned second water supply means 182 is preferably sewage before treatment (for example, sewage upstream of the pump P of the aforementioned relay pumping station 20), from the final sedimentation tank 56 before the disinfection tank 58 outflow of water. These waters contain the nutrients necessary for the germination of the aforementioned spores, and can simultaneously provide the moisture and nutrients necessary for the germination of the spores.

Also, the oxygen supplied from the second oxygen supply means 184 may be supplied in the form of air, similarly to the first oxygen supply means 174 described above. In this case, there is no need to specially set up an oxygen generating device or an oxygen tank. Also, when the oxygen concentration in the sewage is considered to be sufficient for germination, air may be introduced into the sewage in the pump P or the sewage just discharged from the pump P.

Similar to the aforementioned first microorganism activation device 170, the aforementioned second microorganism activation device 180 receives the microbial material from the aforementioned microbial material manufacturing device 62, supplies the microbial material with water from the aforementioned second water supply means 182, and simultaneously The temperature is maintained in the range of 15 degrees to 40 degrees, and the oxygen concentration is maintained at 1 to 10 mg/L, so that the aforementioned spores of the aforementioned microbial materials can germinate and live. change. In order to maintain the aforementioned water temperature within the aforementioned range, cooling and heating equipment may also be provided. In addition, in order to maintain the oxygen concentration in the aforementioned range, oxygen (air) is supplied from the aforementioned second oxygen supply means 184 . Oxygen (air) from the second oxygen supply means 184 is also supplied to the sewage at any one of the relay pump stations 20 to increase the amount of dissolved oxygen in the sewage. In addition, in this microorganism activation device 180, similar to the above, spores usually germinate more than 5 minutes after the germination environment is prepared. The microorganism activation device 180 stays in the sewage for more than 5 minutes before throwing in the sewage (such as the sewage in the aforementioned pump).

With the above configuration, in the sewage treatment system 110, in the sewer pipes downstream of the relay pumping station 20, regardless of the oxygen consumption of the aerobic microorganisms that germinated and the aerobic microorganisms originally present in the sewage , the sewage becomes a state in which sufficient oxygen is dissolved and exists (a state in which the oxygen concentration increases).

As a result of the increase in the oxygen concentration of sewage, the inactivation of sulfate-reducing bacteria which are anaerobic bacteria, and the suppression of hydrogen sulfide production, the production of sulfuric acid can be prevented by the inhibition of sulfuric acid-producing bacteria, and at the same time by good Oxygenated microorganisms improve the bacterial condition in the biofilm on the wall of the sewer pipe starting directly below the relay pumping station to a good state, thereby inhibiting the production of sulfuric acid, preventing corrosion of the sewer pipe, prolonging the life, and at the same time The purification of the sewage itself is realized by the activities of the aforementioned aerobic microorganisms, reducing the burden on subsequent equipment.

In addition, in the present invention, the above-mentioned aerobic microorganisms include, for example, Gram-positive bacteria belonging to the phylum Firmicutes, bacteria belonging to the gram-positive Actinomycetes belonging to the phylum Actinobacteria, and Chlorophyta. At least one of the Gram-positive bacteria of the phylum Bacteria, and yeasts may also be used depending on the case.

On the other hand, examples of the above-mentioned anaerobic and facultative anaerobic microorganisms include microorganisms of Gram-negative sulfate-reducing bacteria of the phylum Proteobacteria present in the intestinal tract, and/or microorganisms of the phylum Bacteroidetes. Gram-negative microorganisms.

This application is based on Japanese Patent Application No. 2018-209391, Japanese Patent Application No. 2018-235072 and Japanese Patent Application No. 2019-149266 (claiming domestic priority of Japanese Patent Application No. 2018-235072), Japanese Patent Application No. 2019-149267 (claiming 209391) to claim priority.

10: Sewage treatment system

20: Relay pumping station

50: Sewage treatment equipment

52: Initial sedimentation tank

54: Biological treatment tank

56: Final sedimentation tank

58: Disinfection tank

60: Dehydration device

62: Microbial material manufacturing device

70: Microbial activation device

72: water supply means

74: Oxygen supply means

100: sewer pipes

P: pump

Claims (23)

A sewage treatment system having a relay pumping station for sewage discharged from households or factories/businesses, etc., and sewage treatment equipment having an initial settling tank, a biological treatment tank, and a final settling tank, and The sewage from the relay pumping station is received through the sewer pipeline and treated. The sewage treatment system is characterized by: dehydration means connected to the initial sedimentation tank and/or final sedimentation tank for receiving The remaining sludge from the initial sedimentation tank and/or the return sludge from the final sedimentation tank are dewatered; the microbial material manufacturing device maintains the temperature of the dewatered sludge from the dewatering means at 60°C~ Oxygen is supplied in a state of 110°C, and Gram-positive aerobic microorganisms in the dewatered sludge undergo aerobic fermentation, thereby decomposing and killing Gram-negative anaerobic and facultative anaerobic microorganisms, And at the same time, produce microbial materials containing spores (spores) of aerobic microorganisms generated after the aerobic fermentation; water supply means, which are used to deliver water from any system in the sewage treatment system to the microorganism activation device described later a microbial activation device, which receives the microbial material from the microbial material manufacturing device, supplies the microbial material with water from the water supply means, and at the same time maintains the temperature of the water in the range of 10°C to 40°C, and maintains the oxygen concentration At 1 ~ 10mg/L, the spores of the microbial material are germinated and activated; and oxygen supply means, which supply oxygen to the sewage at any position in the relay pumping station; wherein, from the relay pumping station will contain The activated microbial material and the oxygenated sewage supplied by the oxygen supply means are sent to the sewage treatment facility. The sewage treatment system described in claim 1, wherein the temperature of the water from the water supply means is maintained in the range of 15°C to 40°C. The sewage treatment system as described in item 1 or item 2 of the scope of the patent application, wherein the water has been treated by the sewage treatment equipment. The sewage treatment system as described in item 3 of the scope of the patent application, wherein the sewage treatment equipment is equipped with a disinfection tank for disinfecting the water from the final sedimentation tank, and the water is the water before disinfection in the disinfection tank water. The sewage treatment system as described in item 1 of the scope of the patent application, wherein the water is sewage upstream of the pump of the relay pumping station. The sewage treatment system as described in item 1 or item 2 of the scope of the patent application, wherein the means for supplying oxygen supplies oxygen to the sewage in the pump of the relay pumping station. The sewage treatment system as described in item 1 or item 2 of the patent application, wherein the water from the water supply means has the nutrients necessary for the germination of the spores. The sewage treatment system as described in item 1 or item 2 of the scope of the patent application, wherein the aerobic microorganisms include Gram-positive bacteria belonging to the phylum Firmicutes and Gram-positive bacteria belonging to the phylum Actinomycetes. At least one of Gram-positive bacteria of the class Actinomycetes and Chloroflexi, and also yeast. The sewage treatment system as described in item 1 or item 2 of the scope of patent application, wherein the anaerobic and facultative anaerobic microorganisms are Gram-negative sulfuric acid including Proteobacteria present in the intestinal tract Microorganisms of salt-reducing bacteria, and/or Gram-negative microorganisms of the phylum Bacteroidetes. A sewage treatment system with a relay pumping station and sewage treatment equipment for sewage discharged from households or factories/businesses, etc., and the sewage treatment equipment has at least an initial sedimentation tank, a biological treatment tank and a final sedimentation tank The biological treatment tank and the final sedimentation tank, and receive the sewage from the relay pumping station through the sewer pipeline, and treat it. The sewage treatment system is characterized in that it has: a dehydration means, which is at least the same as the initial sedimentation tank and a final settling tank connection in the final settling tank for receiving and dewatering at least the remaining sludge from the initial settling tank and the return sludge from the final settling tank; A microbial material manufacturing device that supplies oxygen while maintaining a temperature of 60°C to 110°C to the dewatered sludge from the dewatering means, and dehydrates the sludge by Gram-positive aerobic microorganisms in the dewatered sludge. Aerobic fermentation, whereby gram-negative anaerobic and facultative anaerobic microorganisms decompose to death death, and at the same time produce microbial material containing spores of aerobic microorganisms generated after the aerobic fermentation; the first water supply means, which is used to deliver any one of the wastewater from the sewage treatment system to the first microbial activation device described later. The water in the system; the first oxygen supply means, which is used to supply oxygen to the first microbial activation device described later; the first microbial activation device, which receives the microbial material from the first microbial material production device, and accepts the microbial material from the first The supply of oxygen from the oxygen means and water from the first water supply means, and at the same time maintain the temperature of the water at 10°C~40°C and the oxygen concentration at 1~10mg/L to germinate the spores of the microbial material and Activation, supplying the activated microbial material to the biological treatment tank; the second water supply means, which is used to transport water from any system in the sewage treatment system to the second microbial activation device described later; the second oxygen supply means , which is used to supply oxygen to the second microorganism activation device described later; The supply of water, and at the same time maintain the temperature of the water at 10°C~40°C, and maintain the oxygen concentration at 1~10mg/L, so that the spores of the microbial material will germinate and activate, and the activated microbial material will be supplied to the relay pumping station. The sewage treatment system described in claim 10, wherein the temperature of the water from the first and second water supply means is maintained in the range of 15°C to 40°C. The sewage treatment system described in claim 10, wherein the oxygen from the first oxygen supply means and the second oxygen supply means is supplied in the form of air. The sewage treatment system as described in claim 10 of the patent application, wherein the water supplied to the first microbial activation device is the overflow water from the initial sedimentation tank. The sewage treatment system as described in item 10 of the patent application, wherein the water supplied to the first microbial activation device is sewage before entering the initial sedimentation tank. The sewage treatment system as described in claim 10 of the patent application, wherein the water supplied to the first microorganism activation device is water that has been treated by the sewage treatment equipment. The sewage treatment system as described in item 15 of the scope of patent application, wherein the sewage treatment equipment is equipped with a disinfection tank for disinfecting the water from the final sedimentation tank, and the water supplied to the microbial activation device is The water before disinfection in the disinfection tank. The sewage treatment system as described in claim 10 of the patent application, wherein the water supplied to the second microbial activation device is the overflow water from the initial sedimentation tank. The sewage treatment system as described in item 10 of the patent application, wherein the water supplied to the second microorganism activation device is sewage before entering the initial sedimentation tank. The sewage treatment system as described in item 10 of the patent application, wherein the water supplied to the second microorganism activation device is water that has been treated by the sewage treatment equipment. The sewage treatment system described in claim 19 of the patent application, wherein the second sewage treatment equipment is equipped with a disinfection tank for disinfecting the water from the final sedimentation tank, and the water supplied to the microbial activation device It is the water before disinfection in the disinfection tank. The sewage treatment system as described in claim 10 of the patent application, wherein the water from the first water supply means and the second water supply means has the nutrients necessary for the germination of the spores. The sewage treatment system as described in any one of items 10 to 17 of the scope of patent application, wherein the aerobic microorganisms include Gram-positive bacteria belonging to Firmicutes, Actinomycetes At least one of Gram-positive bacteria of the phylum Actinomycetes and gram-positive bacteria of the phylum Chloroflexi, and yeasts are also included. The sewage treatment system as described in any one of the 10th to 17th claims of the patent application, wherein the anaerobic and facultative anaerobic microorganisms are Gram including Proteobacteria present in the intestinal tract Bacteroides-negative sulfate-reducing microorganisms, and/or Gram-negative microorganisms belonging to the phylum Bacteroidetes.

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