JPS63105313A - Deodoring method - Google Patents

Abstract

PURPOSE:To deodorize a gas generating bad odor by a method wherein air containing odor gas generated from a sludge processing tank is supplied as fuel combustion air for a gas turbine generator producing a combustion temperature more than a specified temperature. CONSTITUTION:Air in a processing chamber 2 is guided from a suction duct 14 to a gas turbine generator 17 and supplied as fuel combustion air. Air in the processing chamber 2 contains bad odor gas such as hydrogen sulfide, phenol, mercaptan, ammonia, etc., generated from various sludge processing tanks, which are exposed to hot temperature of 800 deg.C or higher in a gas turbine generator 17, decomposed and deodorized. In this case, a branch pipe 29 is connected to a stack 20 through a three-way valve 30 to feed air from the processing chamber 2 directly into the stack 20. This branch pipe 29 may perform a direct discharging of gas into surrounding atmosphere from the stack 20 if a large amount of bad odor gas is not contained in the air in the processing chamber 2 and so supplying of air into the gas turbine generator 17 is not performed. With this arrangement, the gas turbine generator 17 is not broken by the bad odor gas.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a deodorizing method for deodorizing a bad odor generated from a sewage treatment tank of a sewage treatment facility.

<Conventional technology> Human waste and domestic wastewater led to the sewage treatment tank emit putrid odor,
Many odorous gases that cause ammonia odor and the like are generated and released into the atmosphere. For this reason, sewage treatment facilities are generally constructed in suburban areas, away from residential areas and downtown areas, taking residents' sentiments into consideration.

However, in this case, the sewage pipes that lead human waste and domestic wastewater from residential areas to sewage treatment facilities become longer and larger in diameter, requiring a great deal of labor to operate the facilities.

On the other hand, with the recent development of sewage treatment technology, it has become possible for sewage treatment facilities to bring sewage into compliance with environmental standards. Therefore, if odorous gases that cause bad odors can be made odorless, constructing sewage treatment facilities in residential areas will not only avoid aggravating residents' sentiments, but also shorten sewage pipes and make construction work easier. It becomes easy. Therefore, in order to deodorize such foul-smelling gases, there are two methods: 1. After acid washing and alkaline washing, the remaining components are adsorbed on activated carbon; This is done using a method that involves decomposition using microorganisms.

<Problems to be Solved by the Invention> However, none of the conventional methods can completely deodorize the malodorous gases generated in large quantities from sewage treatment facilities, and the operation is troublesome.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a deodorizing method capable of deodorizing a malodorous gas by a simple operation.

Means for Solving the Problems> To achieve the above object, the present invention provides fuel combustion air for a gas turbine generator that generates a combustion temperature of 800° C. or higher for air containing odor gas generated from a sewage treatment tank. It is characterized by being supplied as

<Embodiment> The present invention supplies odor gas generated from a sewage treatment tank to a gas turbine generator as fuel combustion air for the gas turbine generator. A gas turbine generator is generally constructed by being incorporated into a power generation device in a jet engine that serves as a driving source for an aircraft, a ship, or the like. This gas turbine generator can burn fuel at a high temperature of 800°C or higher. On the other hand, the odor gas generated from sewage treatment tanks is hydrogen sulfide.

Contains malodorous gases such as various phenols, mercaptans, ammonia, etc. These foul-smelling gases are 700
No decomposition or oxidation occurs near ℃.

It maintains a stable state without being reduced, and even if it is supplied as combustion air to a general incinerator or diesel engine, the odor cannot be removed. However, 80
When supplied as combustion air for a gas turbine engine (gas turbine generator) that generates high heat of 0°C or higher,
When exposed to high temperatures, it is decomposed into a single element or a state close to it, making it odorless. Furthermore, since it is essential to supply a large amount of combustion air to drive the gas turbine generator, even if a large amount of odor gas is generated from the sewage treatment tank, it will be possible to make all of it odorless. Furthermore, the electric power generated by driving the gas-turbine generator can be supplied to various facilities such as a gymnasium, a movie theater, etc. in a nearby residential area. Therefore, for example, if a sewage treatment facility is installed in the basement of a building, and a gas turbine generator is installed inside the same building, it will be possible to purify sewage, eliminate foul-smelling gases, and generate electricity at the same time. This allows sewage treatment facilities to be installed in residential areas, downtown areas, etc.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

<Embodiment> FIG. 1 is a schematic sectional view of an embodiment of the present invention, FIG. 2 is a plan view of the underground portion thereof, and FIG. 3 is a block diagram of the power generation system. Building 1 is built in a residential area or a downtown area, and constitutes various facilities such as a gymnasium, a movie theater, and an entertainment hall. The building 1 consists of an above-ground part and an underground part, and the above-mentioned various facilities are provided in the above-ground part, and the underground part is provided with a treatment room 2 for treating sewage and a power generation room 3 for generating electricity. Treatment room 2 handles human waste discharged from surrounding residential areas and downtown areas.

It processes domestic wastewater to meet environmental standards, and various sewage treatment tanks are installed.

This sewage treatment tank is a sand settling tank4. Aeration tank5. Sedimentation tank 6, nitrification tank 7. Denitrification tank8. A coagulation and sedimentation tank 9, a flow rate adjustment tank, a deaeration tank, and a disinfection tank (all not shown) are appropriately connected in the middle. The sand settling tank 4 removes foreign substances such as soil and sand 2 paper from the wastewater flowing in from the introduction pipe 10, and the aeration tank 5
Aeration is performed to settle the sludge in a settling tank 6 following the aeration tank 5. The nitrification tank 7 mainly oxidizes and decomposes ammonia, and the denitrification tank 8 reduces and removes nitrogen oxides, thereby reducing the BOD and COD of wastewater by 3g and decomposing phosphorus compounds and nitrogen compounds, which meet environmental standard values. The sewage that conforms to the requirements is discharged into a river or the like from a discharge pipe 11 through a coagulation and sedimentation tank 9. Incidentally, a series of such sewage treatment tanks are arranged in plural rows in the treatment chamber 2, so that even a large amount of sewage can be handled. Such a processing room 2 includes an above-ground part 2 power generation room, and a conc IJ-1 wall from other rooms.
It is isolated by a door and maintains negative pressure inside. This negative pressure condition is maintained by the fan 12 in this embodiment. That is, in the processing chamber 2, an air supply duct 13 and an air intake duct 14 are arranged facing each other above the sewage treatment tank, and the fan 12 is attached to the air intake duct 14. Therefore, when the fan 12 is driven, the pressure inside the processing chamber 2 is reduced by the air intake duct 14, and outside air flows in from the air supply duct 13. A pressure state is obtained. In this way, processing chamber 2 is connected to building 1.
By isolating the processing chamber 2 from other rooms and maintaining a negative pressure inside the processing chamber 2, the air inside the processing chamber 2 is transferred to the intake duct 4.
There is no possibility of leakage from any other part except for the tank, and even if the door of the treatment chamber 2 is opened, it is a one-way flow where outside air just flows in. This means that the bad odor generated from the sewage treatment tank will not leak outside, especially in the above ground area. This eliminates the possibility of causing discomfort in all types of facilities.

The power generation room 3 is isolated by a concrete wall like the processing room 2, and a generator 17 is installed inside to supply electricity to various equipment such as lighting fixtures and air conditioners in various facilities installed above ground. supply. In the present invention, a gas turbine generator is used as the generator 17. This gas turbine generator 17 burns at a high temperature of 800° C. or higher, and uses this high temperature to eliminate bad odors and effectively utilize thermal energy. First, deodorization of bad odors is performed by guiding the air in the processing chamber 2 through the intake duct 1-14 to the gas turbine generator 17 and supplying it as fuel combustion air.

In addition, effective use of thermal energy is achieved by gas turbine generators17.
This is done by directing the exhaust gas from the heat exchanger 18 to the heat exchanger 18. Here, the gas turbine generator 17 generates noise when it is driven, but this noise is a high frequency sound wave generated from the high rotation speed of the gas turbine generator 17, so it is easily absorbed by the surrounding concrete walls. It is not transmitted to the outside world.

Therefore, the noise does not reach each facility of building 9,
No noise disturbance will occur.

Next, the above system will be explained with reference to FIG.

In the figure, 19 is a fuel tank and 20 is a chimney.

21 is a heat storage tank, 22 is an air conditioning device, and 23 is a hot water tank. A gas path 24 for exhaust gas from the gas turbine generator 17 is branched into a first gas path 25 connected to the heat exchanger 18 and a second gas path 26 connected to the chimney 20. After leaving the heat exchanger 18, the gas line 25 is connected to a second gas line 26. Valves 27 and 28 are provided on each gas IIIj 25 and 26 to open and close the gas path and adjust the flow rate.The exhaust gas from the pin generator 17 is mainly guided from the first gas path 25 to the heat exchanger 18. It is also possible to lead the gas directly to the chimney 20 from the second gas path 26 and release it into the atmosphere. The gas turbine generator 17 is supplied with fuel such as heavy oil from the fuel tank 19, and
Air for fuel combustion is supplied from the processing chamber 2. The air in the treatment chamber 2 contains foul-smelling gases such as hydrogen sulfide, phenol, mercaptan, and ammonia generated from various sewage treatment tanks.
When exposed to high temperatures of 00°C or higher, these decompose and become odorless. In this case, a large amount of air is required to drive the jet engine, but since all of this air is supplied from the treatment chamber 2, even if a large amount of foul-smelling gas is generated from the sewage treatment tank, it can be completely odor-free. It has become. A branch pipe 29 is connected to the chimney 20 via a three-way valve 30, and acts to directly guide air from the processing chamber 2 to the chimney 20. The branch pipe 29 is used when the air in the processing chamber 2 does not contain a large amount of foul-smelling gas and does not cause any foul odor to be felt by the surroundings, and discharges directly into the atmosphere from the chimney 20.
Air is not supplied to the gas turbine power generator 8!17. As a result, the gas turbine generator 17 is not damaged by foul-smelling gas, and its life can be extended.

The heat exchanger 18 receives exhaust gas from the gas turbine generator 17, and heats water using the latent heat of the exhaust gas. This heating is carried out in two stages to obtain hot water at a temperature of about 80-85°C and thermal storage water at a lower temperature than the hot water (about 55-65°C). In the figure, 30 is a high-temperature circulation path through which high-temperature water circulates, which includes the high-temperature section 18a of the heat exchanger 18, the hot water tank 23, and the air-conditioning device 2.
2 and connected so that high drought circulation occurs. Further, 31 is a heat storage circulation path through which heat storage water circulates, and is connected between the heat storage section 18b of the heat exchanger i18 and the M heat tank 21 so that the heat storage water circulates. Therefore, the high-temperature exhaust gas discharged from the gas turbine generator 17 becomes a degraded product and is discharged from the chimney 20, and the latent heat of the exhaust gas is converted into thermal energy of water, and the thermal energy is effectively utilized as described below. . First, high-drought water is led from the high-temperature circulation path 30 to the hot water HII 23 and the air-conditioning device 22 . The hot water tank 23 supplies high-temperature water to water pipes, shower equipment, baths, etc. connected to the building.

On the other hand, each hall 37 is formed in the building 1 according to its purpose, and each hall 37 is equipped with an air conditioner 3 for heating and cooling.
8 is provided. The heating and cooling device 22 uses, for example, a beat pump, and drives each air conditioner 38 by high water shortage. Therefore, hot water supply, cooling and heating are performed using the high temperature water from the heat exchanger 18, and power can be saved since a power source is not required for these drives. Next, the heat storage water stored in the heat storage tank 21 is applied to the floor heating of the building l through the pipe 39. For this reason, a plurality of pipelines 40 through which heat storage water flows are installed under the floor of the building 1, and when heat storage water is supplied to the pipelines 40 by a pump (not shown), the entire floor becomes hot. It is heated and has underfloor heating.

As a result, the latent heat of the exhaust gas is used for floor heating, making it possible to effectively utilize thermal energy.

Unlike air-conditioned heating, which forces warm air into the room, such floor heating does not generate noise due to airflow. Therefore, since heating can be performed without noise disturbance, this is particularly effective when the building 1 is a facility where noise is a concern, such as a concert hall or conference hall. Furthermore, it is also possible to increase the amount of water stored in the heat storage tank 21 since the yield of heat storage water is greater than that in a high drought, and to supply water to a hot water tank or the like.

<Effects of the Invention> As described above, according to the present invention, the malodorous gas generated from the sewage treatment tank is guided to the gas turbine generator as fuel combustion air and decomposed, so that the malodor can be completely odorless. Can be done. As a result, even if the sewage treatment facility is installed in a residential area, it will not emit a bad odor and will not aggravate residents' sentiments, making it easier to construct the sewage treatment facility and sewage pipes.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an embodiment of the present invention, FIG. 2 is a plan view of the underground portion, and FIG. 3 is a block diagram of the power generation system. 1... Building, 2 Processing room, 3... Power generation room, 4.5,
6, 7, 8, 9...Sewage treatment tank, 12...Fan, 1
3... Air supply duct, 14 - Intake duct j..., 17...
Gas turbine generator, 18... Heat exchanger, 20... Chimney, 21... Heat storage tank, 22... Air conditioning device, 23...
Hot water tank, 30.31...Circulation path, 40...Pipeline.

Claims (1)

[Claims] The air containing odor gas generated from the sewage treatment tank is heated to 800℃.
An odor elimination method characterized by supplying air as fuel combustion air to a gas turbine generator that generates a combustion temperature above.