JP2016123957A - Apparatus and method for treating waste water containing dissolved substance and volatile substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment apparatus and method using a water spray waste water treatment device, filled with microorganism holding carriers, to treat waste water containing odorants and volatile substances.SOLUTION: A waste water treatment apparatus includes: a closed or semi-closed tower having at a top thereof an introduction part of waste water containing dissolved substances and volatile substances and an introduction part of a gas containing oxygen and having a water tank at a bottom thereof; a water spraying chamber having a water spray device for spraying the waste water and installed in the tower to connect the waste water introduction part and the gas introduction part; a reaction part filled with microorganism holding carriers and disposed under the water spraying chamber in the tower; a space part located between the reaction part and the water tank and communicating with a blower sucking the gas and the volatile substances volatilized from the waste water so as to maintain the inside of the tower at a negative pressure; and a drainage device communicating with the water tank to discharge treated water. The waste water and the gas are made to pass through the microorganism holding carriers in the reaction part to oxidatively decompose the dissolved substances and the volatile substances in the waste water at the same time by microorganisms.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a treatment apparatus and a treatment method capable of simultaneously performing treatment of waste water containing dissolved substances and volatile substances and detoxification treatment of volatile substances volatilized from the waste water.

The wastewater treatment method using anaerobic microorganisms (hereinafter referred to as anaerobic treatment method) has advantages such as no need to supply oxygen into the treatment apparatus and a small excess sludge generation rate.
On the other hand, it is known that the organic matter removal rate in the wastewater of the anaerobic treatment method is limited to about 60%.
For this reason, a treatment method using an aerobic microorganism (hereinafter referred to as an aerobic treatment method) may be applied to the secondary treatment of the anaerobic treatment method.
Typical examples include the Upstream Anaerobic Sludge Blanket (UASB) method, which is a high-efficiency treatment method for high-concentration organic wastewater, and the standard activated sludge method for the most common aerobic treatment method. There are combinations.

By the way, in the anaerobic treatment method such as UASB, volatile substances such as methane, hydrogen sulfide, methyl mercaptan, methyl sulfide, and methyl disulfide are generated and decomposed into the treated water in the decomposition process of organic matter in the wastewater. Are known.
Methane is a greenhouse gas, and its emission to the atmosphere is not desirable. Methyl mercaptan, methyl sulfide, and methyl disulfide are “deodorant guides” (Ministry of the Environment, 2003) as typical odor substances in wastewater treatment. ).

Conventionally, as a method for treating waste water containing volatile substances, there is an aerobic treatment method using a standard activated sludge method in which the inside of a reaction tank is aerated (see, for example, Patent Document 1).
In a method using floating microorganisms such as a standard activated sludge method, a fixed bed bioreactor in which a microorganism holding carrier is immersed in a treated water tank has been proposed because there is a problem of bulking (see, for example, Patent Document 2).

However, in these methods, waste water that is to be treated is stored in a treated water tank that is a reaction tank that performs aerobic treatment, and oxygen gas or the like is aerated from the lower part of the tank. The treated water will be dropped and introduced into the treated water tank from the surface of the water.For example, when the secondary treatment of the anaerobic treatment method is provided in the previous stage and the aforementioned volatile substances are mixed in the treated water, the water surface of the water tank While raising the droplets in the tank, the vortex that engulfes the air up to several meters below the surface of the water at the upstream end of the aquarium is entrained and the air is entrained. Some of the volatile substances that have been evaporated. It is known that the transport speed when each volatile substance solution such as methane is dispersed in the air in the form of droplets is larger than the transport speed when the bubbles are dispersed in water from the gas interface. As a result, volatile substances are dispersed in the air on the surface of the water as splashes at the time of introduction.
Further, the remaining sporadic substances dissolved in the water to be treated must be aerated for imparting aerobic microorganism activity and further stirred with aerated bubbles. Volatile substances that are dissolved in water and should be able to be treated by aerobic microorganisms are positively struck out of water and volatilized. Moreover, the speed at which aeration bubbles rise in the water tank is fast, and even if the water tank depth is 4 m to 5 m, the water surface will reach the water surface in 10 seconds on average and fine bubbles in less than 30 seconds. Since there are few, control of activity provision is difficult. In other words, it is extremely difficult to control the sufficient contact time between aerobic microorganisms that sometimes do not readily grow and volatile substances having a low concentration in water.
And when the aeration bubbles rise from the water surface of the water tank to the air, the droplets bounce up from the surface of the liquid, and as described above, the volatile substance solution is transported when dispersed in the air as a droplet. Since the speed is higher than the transport speed that disperses from the gas interface into the water when dispersing from the bubbles into the water, the phenomenon further disperses volatile substances in the air above the water surface as splashes from the water surface downstream of the reaction tank. Is done.
Along with the part that was knocked out when introduced into the previous water tank, the volatile substance is left untreated or incomplete in the reaction tank, leaving the water surface of the reaction tank, and once volatilized. Since there is no mechanism to return to the reaction tank, it is not treated and discharged outside the treated water tank.
Therefore, for example, in a wastewater treatment system to which methods such as Patent Documents 1 and 2 are applied, a gas treatment device that treats gas discharged from the wastewater treatment device is required separately from the wastewater treatment device.
In order to detoxify a volatile substance that has not volatilized from the surface of the water to be treated and stayed in the water to be treated in the reaction tank in a complete organic substance decomposition reaction by an aerobic microorganism, as described above. Since there are few opportunities for contact between individual bubbles floating in the water tank and aerobic microorganisms that are thinly dispersed in the water to be treated, the reaction tank length that increases the residence time to the downstream weir of the reaction tank must be long. , The facility becomes a big deal.

JP-A-6-91289 Japanese Unexamined Patent Publication No. 7-116682

The fundamental problem of the existing technologies such as the above Patent Documents 1 and 2 is that, in the aerobic treatment method as the secondary treatment method of the anaerobic treatment method, waste water that is treated water containing volatile substances is used in the reaction tank. The purpose is to aerate and stir a gas containing oxygen gas from a lower part of the tank stored in a certain water tank. In this method, the air floating in the treated water tank after aeration is mostly released from the surface of the water in a short time of less than 30 seconds as described above due to buoyancy while touching part of the wastewater, and into the treated water. It is difficult to control the aerobic microorganisms present in contact with the volatile substances in the wastewater in a sufficiently active state and the aerobic treatment of the volatile substances with sufficient contact time.
Another problem with existing technology is that exhaust gas containing odor is generated as a secondary pollutant in wastewater treatment due to the above situation, so a gas treatment system is required separately from the wastewater treatment system. That is.

  The present invention has been made to solve these problems all at once. The purpose of the present invention is to fill a reaction part to suspend a microorganism holding carrier in the air in the treatment of waste water containing dissolved substances and volatile substances. The object is to propose a treatment apparatus and treatment method using a sprinkling wastewater treatment apparatus.

  The invention according to claim 1 is a sealed or semi-enclosed tower having a top part of an introduction part of waste water containing dissolved substances and volatile substances and a part of introduction of gas containing oxygen, and a water tank at the bottom part. A water sprinkling device for sprinkling the waste water, filled with a water sprinkling chamber provided in the tower so as to be connected to the waste water introduction portion and the gas introduction portion, and a microorganism holding carrier, and below the water sprinkling chamber The reaction unit disposed in the tower body, and located between the reaction unit and the water tank, and sucks volatile substances volatilized from the gas and the waste water so as to keep the tower body at a negative pressure. The waste water by passing through the microorganism holding carrier of the reaction section through the waste water and the gas, having a space portion communicating with the blower, and a drainage device communicating with the water tank and discharging treated water. Of aerobic microorganisms of soluble and volatile substances And performing simultaneous oxidative degradation.

The invention according to claim 2 is the treatment apparatus of the wastewater containing the dissolved substance and the volatile substance according to claim 1, wherein the microorganism holding carrier is a heterotrophic bacterium that aerobically oxidizes the dissolved substance. It holds ammonia, sulfur odor, and autotrophic bacteria that aerobically oxidize methane.
The invention according to claim 3 is the wastewater treatment apparatus containing the soluble substance and the volatile substance according to claim 1 or claim 2, wherein the microorganism-retaining carrier has water retention and has a hydraulic retention time. It is a resin-made sponge lump made of a porous material having a large number of voids to which microorganisms adhere, which is easy to ensure, and a large number of the resin-made sponge lumps are adjacent to each other via a space.

According to a fourth aspect of the present invention, there is provided a treatment apparatus for wastewater containing a soluble substance and a volatile substance according to the third aspect, wherein the microorganism-supporting carrier is a porous sponge made of a resin having a large number of voids to which microorganisms adhere. A resin sponge lump filled and held in a columnar frame is formed, and a large number of the resin sponge lump is suspended in the air in a state of being stacked and filled above the bottom net of the reaction unit. Features.
According to a fifth aspect of the present invention, in the wastewater treatment apparatus containing the soluble substance and the volatile substance according to the third aspect, the microorganism holding carrier has the resin sponge mass on both surfaces of a water guide sheet having a porous structure. A purification zone is formed in a state where a large number of triangular prisms are attached in parallel, and a plurality of the purification zones are arranged from above the reaction unit and suspended in the air.

The invention according to claim 6 is the wastewater treatment apparatus including the dissolved substance and the volatile substance according to any one of claims 1 to 5, wherein a plurality of the gas introduction parts are provided at the top part. It is characterized by that.
The invention according to claim 7 is the wastewater treatment apparatus including the soluble substance and the volatile substance according to any one of claims 1 to 5, wherein the space section includes a plurality of lead-out sections communicating with the blower. It is provided.
The invention according to claim 8 is the wastewater treatment apparatus including the soluble substance and the volatile substance according to any one of claims 1 to 7, wherein the reaction unit is divided into a plurality of reaction units, An intermediate space portion is formed between the reaction portions, and each of the intermediate space portions is provided with an introduction portion for a gas containing oxygen.

  The invention according to claim 9 is the operation method of the wastewater treatment apparatus containing the soluble substance and the volatile substance according to any one of claims 1 to 8, wherein the wastewater containing the soluble substance and the volatile substance is disposed. A step of sucking oxygen-containing gas from the oxygen-containing gas introduction portion by the blower while supplying the wastewater from the wastewater introduction portion; and a step of uniformly spraying the wastewater into the watering chamber by the water spraying device; The sprinkled wastewater flows down toward the reaction section, and volatile substances volatilized from the wastewater into the sprinkling chamber flow down toward the reaction section in a state of co-current with the wastewater by suction of the blower. A step of allowing the waste water to pass through in the reaction section, thereby causing simultaneous oxidative decomposition of the dissolved substances and volatile substances in the waste water by aerobic microorganisms; The step of releasing the gas from which the volatile substances have been removed from the exhaust part of the space part into the atmosphere as exhaust gas by the blower, and the inside of the space part flowing down from the reaction part was stored in the water tank. And a step of discharging treated water by the drainage device.

According to the present invention, by using a sprinkling treatment structure in which a microorganism holding carrier is suspended in the air, a gas containing oxygen necessary for oxidative decomposition of an object to be treated is supplied in parallel to the sprinkling, thereby The dissolved substance and the volatile substance can be reliably passed through the reaction part (microorganism holding part).
According to the present invention, since a large amount of oxygen-containing gas can be passed through the reaction part, the aerobic microorganisms adhering to the carrier are sufficiently separated from volatile substances that are odorous components that easily volatilize from the waste water. In an active state and aerobic treatment of volatile substances with sufficient contact time can be promoted and treated.
According to the present invention, a DHS (Downflow Hanging Sponge) having a large gas-liquid contact area due to a huge area for holding liquid as a sprinkling treatment structure in which a microorganism holding carrier is suspended in the air is used. By supplying a gas containing oxygen necessary for oxidative decomposition in parallel to the water spray, the volatile substances that have moved to the gas side once sprinkled on the microorganism-supporting carrier are transferred to the aerobic microorganisms. Sufficient amount of aerobic microorganisms adhering to the carrier and volatile substances that are easily volatile from the wastewater on the surface of the microorganism-retaining carrier that stores the treated water with a very large surface area. It is possible to promote and treat the direct contact in the active state and the contact through the water film to be treated, and the aerobic treatment of the volatile substance with sufficient contact time.
According to the present invention, a DHS using a DHS that has a large gas-liquid contact area due to its enormously large area for holding liquid as a sprinkling type treatment structure in which a microorganism holding carrier is suspended in the air, By supplying a gas containing oxygen necessary for oxidative decomposition of water in parallel with the water spray, aerobic microorganisms can be easily volatilized from the wastewater by keeping them in one place with water retention. The aerobic treatment of the volatile substance can be promoted and processed while ensuring sufficient contact with the volatile substance as the odor component in a sufficient active state.

According to the present invention, by introducing a gas containing oxygen so that the inside of the apparatus has a slight negative pressure, for example, untreated volatile substances in the upper part of the reaction unit or the like can be reliably prevented from leaking outside the apparatus. be able to.
According to the present invention, since the treatment of the dissolved substance and the volatile substance can be performed by a single wastewater treatment apparatus, it is compact and economical.
According to the present invention, since energy for supplying oxygen into the apparatus can be reduced, it is energy saving and economical as compared with the conventional method.

It is a schematic diagram which shows the reaction tank which concerns on 1st embodiment of this invention. It is a front view of the microorganisms holding carrier used in 1st embodiment of this invention. It is a top view of the microorganisms holding carrier used in 1st embodiment of this invention. It is a perspective view of the microorganisms holding carrier used by 1st embodiment of this invention. It is a schematic diagram which shows the reaction tank which concerns on 2nd embodiment of this invention. It is a schematic diagram which shows the reaction tank which concerns on 3rd embodiment of this invention. It is the schematic which shows the example which applied the reaction tank which concerns on 1st embodiment of this invention to the secondary treatment apparatus of anaerobic treated water (treated water).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a reaction tank 10 according to a first embodiment to which a treatment apparatus for wastewater containing a soluble substance and a volatile substance of the present invention is applied.
The outer shape of the reaction vessel 10 is formed of a sealed tower body 20. The sealed tower body 20 is provided with an introduction part 22 for waste water containing dissolved substances and volatile substances (hereinafter referred to as treated water) and an introduction part 23 for gas containing oxygen at the top part 21. . In FIG. 1, the introduction portion 22 of the water to be treated is indicated by an arrow, but the tapping is similar to the introduction portion 23 of the gas containing oxygen, and only tapping or watering is performed depending on the specifications of the watering device 26 described later. The chamber 25 may be piped. Further, the sealed tower body 20 is provided with a water tank 24 on the bottom side.

Examples of the soluble substance contained in the wastewater include organic substances, ammoniacal nitrogen, hydrogen sulfide, and the like. Further, volatile substances contained in the wastewater are NH ₃ , H ₂ S, mercaptans, CH ₄ and the like.
The introduction portion 22 of the water to be treated and the introduction portion 23 of the gas communicate with a sprinkling chamber 25 provided immediately below the top portion 21 of the tower body 20. The sprinkling chamber 25 is provided with a sprinkler 26 for sprinkling the water to be treated introduced from the introduction portion 22 of the water to be treated.

The sprinkler 26 is, for example, a bowl shape or a tube shape in which a large number of holes are provided on the bottom surface so that the water to be treated supplied from the introduction portion 22 of the water to be treated can be uniformly sprinkled in the water sprinkling chamber 25. Alternatively, a bowl-shaped water channel 26a provided with a weir at the upper end of the side surface is provided. In the fixed type, a large number of the water passages 26a are arranged vertically and horizontally in the water sprinkling chamber 25. In the case of the rotary type, the water passage 26a is arranged in a straight line around the center of the flat surface of the water sprinkling chamber 25, or radially when there are two or more. Extended and arranged. In the case of the rotary type, the sealed tower body 20 is preferably a cylindrical tower body.
In the present embodiment, the watering device 26 is provided with a motor 26b above the center of the plane center of the watering chamber 25, which is in the vicinity of the treated water introduction part 22, and the treated water introduced from the treated water introduction part 22 is supplied. In the case of two or more, it is guided to the water channel 26a that is extended radially, and the water channel 26a is rotated so that the water to be treated is uniformly sprayed in a plane in the water spray chamber 25. Has been. In the case of the rotary type, if a water turbine that rotates in a horizontal plane is installed below the introduction portion 22 of the water to be treated near the center of the water spray chamber 25 and the water turbine and the water channel 26a are linked, the motor 26b Even if there is no such power, the water to be treated that is falling can rotate the water wheel to rotate the water.
The water sprinkling chamber 25 has a volatile substance volatilized from the water to be treated (hereinafter referred to as the gas to be treated) and the water to be treated when the water to be treated introduced from the introduction portion 22 of the water to be treated is sprinkled by the water sprinkler 26. It is necessary to cover the treated water so that it does not scatter. Therefore, in this embodiment, the tower body 20 is comprised with the sealed structure.

Immediately below the sprinkling chamber 25, a reaction unit 28 filled with a microorganism holding carrier 29 is arranged in the tower body 20. The reaction unit 28 has a watering treatment structure in which a microorganism holding carrier 29 is suspended in the air. The microorganism holding carrier 29 is made of, for example, a resin sponge lump made of polyurethane or the like. The microorganism holding carrier 29 is preferably porous and water-retaining in order to increase the processing efficiency. A porous and water-retaining material can increase the microorganism retention density and ensure the hydraulic residence time. Porous resin sponge lump having a large number of voids to which microorganisms adhere is filled or suspended in the reaction unit 28 such that at least part of the resin sponge lump is adjacent to each other through a space. It has become.
For example, as shown in FIGS. 2 and 3, the microorganism holding carrier 29 is filled and held in a plastic frame body 51 formed in a cylindrical shape with a resin sponge lump 50 to form a carrier element 52. The carrier element 52 may be suspended in the air in a state where the carrier element 52 is stacked and filled above the bottom net portion of the reaction unit 28.
The frame body 51 includes a plurality of annular bodies 51a formed in an annular shape, connecting members 51b arranged at regular intervals in the circumferential direction of the annular body 51a so as to integrally connect the annular bodies 51a, and the frame body 51 A porous cylindrical body support 51c attached in a cross shape so as to extend in the radial direction is provided on an annular body 51a disposed on one end side in the longitudinal direction.
Thus, the resin sponge mass 50 is accommodated in a frame 51 to form a carrier element 52, and the carrier element 52 has a length L of about 50 mm and a diameter D of about 30 mm.
Further, for example, as shown in FIG. 4, the microorganism holding carrier 29 is a state in which a large number of resin sponge lumps 61 are attached in parallel to each other on both surfaces of a water guide sheet 60 such as a net member having a porous structure. The purification zone 62 may be used, and a plurality of purification zones 62 may be arranged from above the reaction unit 28 and suspended in the air via a hanging member 63 provided in the purification zone 62.
A sprinkling treatment structure in which the microorganism holding carrier 29 provided with the resin sponge lump 50 and the purification zone 62 is suspended in the air is referred to as DHS.
The microorganism-supporting carrier 29 includes heterotrophic bacteria that aerobically oxidize dissolved substances, and autotrophic bacteria that aerobically oxidize ammonia, sulfur-based odors (hydrogen sulfide, methyl sulfide, etc.) and methane. Holding.

Here, heterotrophic bacteria have a relatively high growth rate, and can be easily used by, for example, separating standard activated sludge from a sewage treatment plant and inoculating it in the microorganism holding carrier 29. In addition, since the autotrophic bacteria have a relatively slow growth rate, they are allowed to grow naturally in the microorganism-supporting carrier 29 after taking a certain amount of time after inoculating the standard activated sludge.
A space 30 is provided in the tower body 20 between the reaction unit 28 and the water tank 24. The space portion 30 is provided with an exhaust portion 31 that communicates with a blower 32 such as a fan that sucks a gas containing oxygen so as to keep the inside of the tower body 20 at a negative pressure.

The water to be treated in the water tank 24 is drained outside the apparatus through a drain apparatus 33 such as a pump.
In the present embodiment, since the oxygen supply into the reaction vessel 10 is a suction type, the inside of the tower body 20 has a negative pressure, and thus leakage of the gas 27 to be processed does not occur. There is no problem as long as it is a sealed or semi-sealed type. Conversely, when the oxygen supply is a push-in type (the inside of the tower body 20 is positive pressure), it must be a completely sealed type.
Further, in the present embodiment, in order to supply a gas containing oxygen from the outside of the reaction vessel 10, a gas containing part 23 and an exhaust part 31 are provided. It is desirable that the oxygen-containing gas introduction section 23 and the exhaust section 31 are arranged so that supply oxygen hardly flows.

The reaction vessel volume design is designed with TOD (Total Oxygen Demand) volume load (substance load to be treated per reaction vessel volume) as in the case of normal biological wastewater treatment. For example, TOD = cBOD + oxygen sulfide + sulfur oxide oxygen + methane oxide oxygen +. In the present embodiment, the volume load (load per effective microbe holding carrier volume) is, for example, ≦ 3 kg-TOD / m ³ / day. Here, the effective volume of the microorganism holding carrier means a volume in which the microorganism holding carrier 29 to be used can hold the water to be treated. DHS, which is a sprinkling treatment structure in which the above-described resin sponge lump 50 and the microbial holding carrier 29 provided with the purification zone 62 are suspended in the air, has a water holding property and has a large effective area for the microbial holding carrier because of its porosity. For example, the bulk volume of the microorganism holding carrier 29 is 1 m ³ , the amount of water to be treated therein is 0.7 m ³ regardless of air suspension, and the effective volume of the microorganism holding carrier is 0.7 m ³ . In other types of microorganism-supporting carriers floating in the water tank (for example, carriers with low water retention such as hard resin such as Raschig rings and pole rings), the effective volume of the microorganism-supporting carrier is 1/100 to less than 1/1000 compared to this. .

In this embodiment, since it blows in the reaction tank 10, it is set as the reaction tank shape suitable for the LV (linear velocity) reference value of ventilation. The SV (space velocity) of air blowing is naturally determined by the volume load and the LV. From the actual performance value of DHS, which is a sprinkling type processing apparatus in which the microorganism holding carrier 29 is suspended in the air, LV (air), which is the LV of the blowing, is <5 m / h, and SV (air), which is the blowing SV, is <5 h ^−. If it is ¹ , performance will be demonstrated. These values are used as reference values, but it is confirmed that there is no deviation during the design. If the height of the reaction part and the space part is set to 4 m to 5 m, the air residence time can be about 1 hour or more from LV (air). This is because the microbe holding carrier 29 can hold the water to be treated, and the effective volume of the microbe holding carrier 29 and the pores of the porous microbe holding carrier 29 that earns the water to be treated are divided into small air flows. Show. This also makes the oxygen utilization efficiency very high, ≦ 10%.
Further, the blast volume is calculated based on the oxygen demand for each substance to be treated shown in Table 1 (based on the stoichiometry assuming that the substance to be treated is completely oxidized), the TOD of the water to be treated shown in Table 2, 3 is determined by calculating the required oxygen amount (AOR (Actual Oxygen Requirement)) (quoting AOR in a general aerobic treatment method).
Table 4 shows the calculation of the required total air volume (Gs) (when the supply oxygen form is air).

Next, the operation of this embodiment will be described.
First, for example, while supplying anaerobic treated water such as UASB treated water from the introduction portion 22 of the water to be treated, for example, the air (O ₂ concentration 0.232 kgO ₂ / kgAir) is gas by the blower 32 as a gas containing oxygen. Is sucked from the introduction part 23.
The pH of the water to be treated is preferably in the neutral range. When the treated water to be introduced is, for example, sewage or medium-temperature anaerobic treated water, the pH is in a neutral range (about pH 6 to 8), and thus it is not necessary to adjust the pH of the incoming treated water. The water temperature is preferably 20 ° C to 39 ° C.

Next, the water to be treated is uniformly sprayed into the watering chamber 25 by the watering device 26. In order to uniformly disperse in the microorganism holding carrier 29 of the reaction unit 28, the water droplets are sprinkled as small water droplets, so that a part of the volatile substance is positively volatilized from the water to be treated as the gas 27 to be treated. A gas 27 to be processed is generated in the watering chamber 25 by gasification.
Next, the treated water sprayed flows down toward the reaction unit 28. At the same time, the to-be-treated gas 27 flows down toward the reaction section 28 in parallel with the to-be-treated water by the suction of the blower 32. The treated water that flows down passes through the surface and the pores of the porous microorganism holding carrier 29, and part of the treated water remains on the surface of the microorganism holding carrier 29 due to the water retention property of the microorganism holding carrier 29. It becomes. The gas 27 to be treated also licks the water to be treated such as in the pores of the porous microorganism holding carrier 29 that increases the surface area of the water to be treated while passing through the pores of the porous microorganism holding carrier 29 that increases the surface area. However, a part of the volatile substance is moved to the treated water side to be dissolved or comes into contact with the surface of the microorganism. The dissolved volatile substance is oxidatively decomposed mainly by the action of autotrophic bacteria growing in the pores of the porous microorganism holding carrier 29 having water retention.
Next, both the dissolved substance and the volatile substance, which are the objects to be treated, pass through the reaction part 28, the dissolved substances are mainly accompanied by the water to be treated, and the volatile substances are also treated with the water to be treated. The volatile substances in the gas to be treated are dissolved again in the water to be treated or the surface of the microorganisms are touched by the volatile substances in the gas to be treated. Due to the action of vegetative bacteria and autotrophic bacteria, dissolved substances and volatile substances are simultaneously oxidized and decomposed.

In the reaction unit 28, for example, autotrophic bacteria in which components such as hydrogen sulfide and mercaptans among volatile substances contained in the gas 27 to be treated are dissolved on the microorganism-supporting carrier 29 after being dissolved in the water to be treated. It is oxidized and decomposed to sulfuric acid by the action of. The gas 27 to be treated passes through the pores of the porous microorganism holding carrier 29 that obtains a porous and water-retaining surface area, and passes through the pores of the porous microorganism holding carrier 29 that obtains the surface area of the water to be treated. While licking the surface of the water to be treated, a part of the volatile substance is moved to the side of the water to be treated and dissolved. The gas 27 to be treated has an LV (air), that is, an air residence time of about 1 when the combined height of the reaction part 28 and the space part 30 is set to 4 to 5 m thanks to the microorganism holding carrier 29 of the reaction part 28. Since it takes a very long time and is in contact with the water to be treated thinly spread on the microorganism holding carrier 29, it is possible to promote the dissolution of the volatile substance in the water to be treated.
In addition, most of the dissolved organic matter in the water to be treated and the main component of the accompanying substances are decomposed to carbon dioxide by the action of heterotrophic bacteria growing on the microorganism holding carrier 29 via the water to be treated. The Ammonia nitrogen is also decomposed to the final form of nitrate nitrogen.
Next, the to-be-processed gas 27 from which the component of the volatile substance has been removed is released from the exhaust part 31 of the space part 30 into the atmosphere as exhaust gas by the blower 32.
Next, the water to be treated that has undergone oxidative decomposition in the reaction unit 28 flows down into the space 30 as treated water, is stored in the water tank 24, and is drained out of the apparatus by the drainage device 33.

As described above, according to the present embodiment, the gas containing oxygen necessary for the oxidative decomposition of the object to be processed is supplied in parallel to the water spray, so that the dissolved substance and the volatile substance are reacted with the reaction unit. The inside of 28 can be reliably passed.
According to the present embodiment, untreated volatile substances leak out of the reaction tank 10 by introducing a gas containing oxygen by suction of the blower 32 so that the inside of the reaction tank 10 has a slight negative pressure. Can be surely prevented.
According to this embodiment, since processing of a soluble substance and a volatile substance can be performed with the processing apparatus of a single waste water, it is compact and economical.
According to the present embodiment, energy for supplying oxygen into the reaction vessel 10 can be reduced, which is energy saving and economical as compared with the conventional method.

FIG. 5 shows a reaction tank 10A according to a second embodiment to which the wastewater treatment apparatus of the present invention is applied.
In the present embodiment, in order to increase the inflow / outlet of the gas containing oxygen and make the flow in the reaction tank 10A uniform, two oxygen introduction portions 23 and two exhaust portions 31 are provided, This is different from the first embodiment.
In the present embodiment, the oxygen-containing gas introduction section 23 and the exhaust section 31 are larger than those in the first embodiment, so that an even flow in the reaction vessel 10A can be easily ensured.
In the present embodiment, the case where two oxygen-containing gas introduction portions 23 and two exhaust portions 31 are provided has been described. However, the present invention is not limited to this, and the oxygen-containing gas introduction portion 23 and exhaust gas are provided. If three or more parts 31 are provided, it is easier to ensure an even flow in the reaction vessel 10A.
Also in this embodiment, the same operational effects as in the first embodiment can be achieved.

FIG. 6 shows a reaction tank 10B according to a third embodiment to which the wastewater treatment apparatus of the present invention is applied.
This embodiment is different from the first embodiment in that the oxygen-containing gas introduction portions 23 are provided in multiple stages from the side of the tower body 20.
In the present embodiment, the reaction unit 28 is divided into three, an intermediate space 34 is formed between the reaction units 28, and oxygen-containing gas introduction units 23 are additionally provided.
According to this embodiment, in each reaction part 28, the flow which the to-be-processed water and the to-be-processed gas 27 flow down in a cocurrent state is accelerated | stimulated rather than 1st embodiment. The pressure loss of the reaction unit 28 is about several Pa.
It is also possible to provide a throttle in the gas introduction part 23 near the exhaust part 31 so that the inputs from the respective gas introduction parts 23 are equalized.
Also in this embodiment, the same operational effects as in the first embodiment can be achieved.

FIG. 7 shows an example in which the reaction tank 10 according to the first embodiment is applied to a secondary treatment apparatus for anaerobic treated water (treated water).
The raw wastewater introduced into the anaerobic treatment tank 40 is molasses wastewater. The treated water derived from the anaerobic treatment tank 40 is anaerobic treated water of raw waste water. The volume of the reaction vessel 10 is 22 m ³ .
Next, a processing flow will be described based on FIG.
First, the water to be treated derived from the anaerobic treatment tank 40 is supplied from the waste water introduction part 22 of the reaction tank 10 into the sprinkling chamber 25, and the atmosphere (O ₂ concentration 0.232 kgO ₂ / O ₂₎ as a gas containing oxygen. kgAir) is sucked into the reaction vessel 10 from the gas inlet 23 by the blower 32.

Next, the water to be treated is uniformly sprinkled into the watering chamber 25 by the water sprinkler 26, and the water to be treated 27 is generated from the water to be treated in the watering chamber 25 by this watering.
Next, the water to be treated that has been sprinkled flows down toward the reaction unit 28. At the same time, the to-be-treated gas 27 flows down toward the reaction section 28 in parallel with the to-be-treated water by the suction of the blower 32.
Next, the dissolved substance and the volatile substance, which are the objects to be processed, pass through the reaction unit 28, so that the dissolved substance and the volatile substance are simultaneously oxidized and decomposed by the action of the aerobic microorganism.

Next, the to-be-processed gas 27 from which the odor component is removed is released into the atmosphere as exhaust gas by the blower 32 from the exhaust part 31 of the space part 30.
Next, the water to be treated that has undergone oxidative decomposition in the reaction unit 28 flows down into the space 30 as treated water, is stored in the water tank 24, and is sent out of the apparatus by the drainage device 33.

The processing capability in this embodiment is as shown in Table 5. Hereinafter, a description will be given based on Table 5.
The main components of the water to be treated are organic matter (COD _cr : expressed as the amount of organic matter in chemical oxygen demand), ammoniacal nitrogen, and dissolved hydrogen sulfide. Since it is difficult to directly measure dissolved hydrogen sulfide in the water to be treated, the concentration of hydrogen sulfide (as one of the gases to be treated 27) volatilized in the watering chamber 25 inside the reaction tank 10 was measured as the atmosphere in the upper part of the reaction tank. Similarly, mercabtans, which are representative odor substances, were also measured.

After operating the motor 26b of the water sprinkler 26 and the blower 32 attached to the reaction tank 10, the water to be treated derived from the anaerobic treatment tank 40, which is the upstream UASB tank in FIG. When the water is supplied from the unit 22 and sprayed evenly in the water sprinkling chamber 25, the atmosphere at the upper part of the reaction tank is in the column of the upper atmosphere of the reaction tank in Table 5 and 62 ppm of hydrogen sulfide and 0.45 ppm of mercaptans. However, in the exhaust gas column for collecting the exhaust gas downstream of the blower 32 that directly derives the air in the space 30 below the reaction unit 28, both hydrogen sulfide and mercaptans are very low at 0 ppm. Treated well.
From Table 5, it can be seen that hydrogen sulfide and mercaptans, which are volatile substances, as well as COD _cr and ammonia nitrogen, which are soluble substances, were oxidatively decomposed (COD _cr concentration of 1,100 mg / L in treated water is the wastewater) Derived from unique coloring components, biodegradation is very difficult).
It can be seen that most of the COD _cr component was successfully decomposed to carbon dioxide and ammoniacal nitrogen to the final oxidized form nitrate nitrogen.
Odorous components such as hydrogen sulfide and mercaptans are oxidatively decomposed to sulfuric acid. Sulfate sulfur, which was not detected in the water to be treated, appeared at a high concentration in the treated water, indicating that hydrogen sulfide and mercaptans were appropriately oxidized and decomposed.

10, 10A, 10B Reaction tank 20 Sealed tower body 21 Top 22 of sealed tower body 20 Introduced part 23 of water to be treated 23 Introduced part of gas containing oxygen 24 Water tank 25 Sprinkling chamber 26 Sprinkler 26a Water channel 26b Motor 27 Processed gas 28 Reaction part 29 Microorganism holding carrier 30 Space part 31 Exhaust part 32 Blower 33 Drainage device 40 Anaerobic treatment tank

Claims (9)

A closed or semi-enclosed tower with a water tank at the bottom and a waste water introduction part containing dissolved substances and volatile substances at the top and a gas introduction part containing oxygen,
A watering device for sprinkling the wastewater, a watering chamber provided in the tower body so as to be connected to the introduction portion of the wastewater and the introduction portion of the gas;
A reaction part that is filled with a microorganism-retaining carrier and is arranged in the tower below the watering chamber;
A space part located between the reaction part and the water tank and communicating with a blower for sucking volatile substances volatilized from the gas and the waste water so as to keep the inside of the tower at a negative pressure;
A drainage device communicating with the water tank and discharging treated water;
By passing the waste water and the gas through the microorganism-supporting carrier in the reaction section, the dissolved substance and the volatile substance are subjected to simultaneous oxidative decomposition by aerobic microorganisms. Wastewater treatment equipment containing volatile substances. In the processing apparatus of the wastewater containing the soluble substance and volatile substance of Claim 1,
The microorganism-retaining carrier retains heterotrophic bacteria that aerobically oxidize the dissolved substance and autotrophic bacteria that aerobically oxidize ammonia, sulfur-based odor, and methane. Wastewater treatment equipment containing volatile substances and volatile substances. In the processing apparatus of the wastewater containing the soluble substance and volatile substance of Claim 1 or Claim 2,
The microorganism-supporting carrier is a porous resin sponge lump having a large number of voids to which microorganisms adhere, which has water retention and facilitates a hydraulic retention time. An apparatus for treating wastewater containing dissolved substances and volatile substances, characterized in that at least a part thereof is adjacent to each other through a space. In the processing apparatus of the wastewater containing the soluble substance and volatile substance of Claim 3,
The microorganism holding carrier is a resin sponge lump in which a porous resin sponge having a large number of voids to which microorganisms adhere is filled and held in a columnar frame material, and a large number of the resin sponge lump is formed. An apparatus for treating wastewater containing a soluble substance and a volatile substance, wherein the apparatus is suspended in the air in a state of being stacked and filled above the bottom net part of the reaction part. In the processing apparatus of the wastewater containing the soluble substance and volatile substance of Claim 3,
The microorganism holding carrier is a purification zone in a state where a large number of the resin sponge masses are attached in parallel on both sides of a water guide sheet having a porous structure, and a plurality of the purification zones are formed from above the reaction part. A wastewater treatment apparatus containing dissolved substances and volatile substances characterized by being suspended in the air side by side. In the processing apparatus of the wastewater containing the soluble substance and volatile substance in any one of Claims 1 thru | or 5,
A plurality of the gas introduction sections are provided at the top. A treatment apparatus for wastewater containing a soluble substance and a volatile substance. In the processing apparatus of the wastewater containing the soluble substance and volatile substance in any one of Claims 1 thru | or 5,
The space part is provided with a plurality of outlet parts communicating with the blower. A treatment apparatus for wastewater containing a soluble substance and a volatile substance. In the processing apparatus of the wastewater containing the soluble substance and volatile substance in any one of Claims 1 thru | or 7,
The reaction part is divided into a plurality of reaction parts, an intermediate space part is formed between the reaction parts, and an oxygen-containing gas introduction part is provided in each of the intermediate space parts. Wastewater treatment equipment containing dissolved and volatile substances. In the operation method of the wastewater treatment apparatus containing the soluble substance and the volatile substance according to any one of claims 1 to 8,
Sucking a gas containing oxygen from the introduction part of the gas containing oxygen by the blower while supplying waste water containing the soluble substance and the volatile substance from the introduction part of the waste water;
Watering the wastewater uniformly into the watering chamber by the watering device;
The sprinkled waste water is caused to flow down toward the reaction section, and volatile substances volatilized from the waste water into the sprinkling chamber are caused to flow down toward the reaction section in parallel with the waste water by suction of the blower. Process,
In the reaction part, by allowing the wastewater to pass therethrough, simultaneous oxidative decomposition by aerobic microorganisms of the dissolved substances and volatile substances in the wastewater; and
Discharging the gas from which the volatile substances have been removed from the exhaust portion of the space portion into the atmosphere as exhaust gas by the blower;
And a step of discharging the treated water stored in the water tank by flowing down from the reaction section into the space section by the drainage device. A method for treating wastewater containing dissolved substances and volatile substances.

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