JP4024790B2 - Sewage treatment equipment - Google Patents

Description

  The present invention relates to a sewage treatment apparatus that treats sewage discharged from various industrial activities into a disposable form.

Examples of industries that generate sewage include dairy farming and pig farming. In these industries, a large amount of sewage mixed with manure is generated every day. Even in the fishery processing industry and the food manufacturing industry, a large amount of sewage is generated every day from fish seeds and various ingredients. Of course, these are not allowed to be discharged into rivers. It must be treated to meet disposal standards before it can be discarded.
One example of a conventional sewage treatment method is a treatment method using microorganisms. In this method, pollutants contained in sewage are decomposed by microorganisms. In order to perform the purification action by microorganisms actively, it is necessary to adjust the concentration of pollutants contained in the sewage to a concentration at which microorganisms can easily act (concentration adjustment). Its concentration is considerably lower than that of sewage discharged from such industries. Therefore, after adding a large amount of water and diluting it (sometimes adding tens of times the amount of raw sewage water), treatment with microorganisms was performed.
In addition, environmental issues have been attracting attention not only in Japan but also worldwide, and the standards for disposal of sewage are becoming stricter in order to convey the good environment to future generations.
Japanese Patent Laid-Open No. 2002-361489

The above-described sewage treatment method using microorganisms has the following problems.
(1) It is necessary to dilute the sewage in order to activate the purification action by microorganisms, but it could not be installed unless a large amount of water for diluting was available at a low price.
(2) As a result of adding a large amount of water to sewage, the total amount of sewage becomes large. Therefore, as a sewage treatment facility, a large facility for accommodating and moving a large amount of sewage is required, and expenses (electricity fee, chemical fee, etc.) for operating these facilities are increased and cost is increased. Becomes higher.
(3) Even when trying to discharge treated water to a nearby river, depending on the type of the river, the disposal standards may be strict and may not be released. In addition, although it can be discharged at this point, the disposal standards have been revised and if the same level of sewage treatment as before has been carried out, it will not be possible to release it in one or two years. (This is a very serious problem for establishments located on such land (eg, dairymen) where the existence of establishments is questioned). In the face of such a situation, there is a demand for a treatment method that allows treatment even if water is not discharged into the river, but it has not been able to meet the demand.
This invention makes it a subject to provide the sewage treatment apparatus which does not have the above problems.

In order to solve the above-mentioned problems, a sewage treatment apparatus according to the present invention has a structure of a steam heat source, a cooling water supply unit, and a heat exchanger, and compresses the steam from the steam heat source into high-temperature compression from an air source generation unit described later. the sewage to be treated and the air are mixed steam with evaporated moisture soil in water by the heat exchanger, a pressure control valve steam as a heat source is released into the atmosphere becomes more than a predetermined pressure has been attached heated the can portion, the evaporator top and bottom is communicated by the heating can portion and the upper communication pipe and the lower communicating pipe, the supply line is connected to the middle of the upper communicating tube, its liquid level wastewater to be treated A sewage supply unit that supplies the heating can and the evaporator while adjusting so as to be positioned in the upper communication pipe, and a structure of a heat exchanger, and the sewage evaporation vapor sucked from the evaporator and the cooling water supply unit Heat exchange with the cooling water from the A gas-liquid separation can for gas-liquid separation of the steam, connected to suck the gas input side is separated by the gas-liquid separation can suck air, the output side for discharging air which has a high temperature by compression of the hot compressed air as a heat source An air source generating unit connected to the heating can unit to supply, and the air source generating unit reduces the pressure in the heating can unit and the evaporator by air suction through the gas-liquid separation can. Evaporation of water contained in the sewage is facilitated, and moisture of sewage supplied one after another is evaporated, so that solid contaminants contained in the sewage increase in concentration and accumulate in the lower communication pipe. , constituting said solid contaminants and discarded dried sucking from the lower communication pipe, water contained in wastewater after the distilled water by cooling the sewerage evaporating vapor in the gas-liquid separation can, and discarded sucking Was

The heating can is composed of a main heating can and a preheating can, the preheating can has a heat exchanger structure, and sewage is first supplied from a sewage supply unit, and the preheated sewage is the main heat can. You may make it arrange | position so that it may be supplied to this main heating can and this evaporator from the middle of the upper communicating pipe which connects a heating can and an evaporator.
Further, the preheating can is supplied with steam directly supplied from a steam heat source as the heat source and steam after being used for heating by the main heating can. It is good also as what is provided with the pressure regulation valve made to discharge | release.

  Alternatively, in the sewage treatment apparatus described above, a plurality of combinations of heating cans and evaporators are provided, and the sewage sucked out from the lower communication pipe in the previous stage is supplied to the upper communication pipe in the next stage, and sucked out from the previous evaporator. Sewage evaporation vapor is supplied as a heat source for the next stage heating can, and the last stage evaporation can is connected to a gas-liquid separation can. It is configured to supply as a heat source. Solid pollutants contained in sewage are sucked out from the lower communication pipe at the last stage and discarded. It can also be discarded.

Further, sewage treatment apparatus of the present invention, a steam heat source, has a structure of the heat exchanger, the soil in water and sewage to be treated with steam from the steam heat source and below the air source generating portion by heat exchange The upper and lower parts communicate with each other by a heating can part provided with a pressure regulating valve for evaporating moisture and releasing the steam as a heat source to the atmosphere when the pressure exceeds a predetermined pressure, and the heating can part and the upper communication pipe and the lower communication pipe. The evaporator and the supply path are connected to the middle of the upper communication pipe, and the waste water to be treated is supplied to the heating can and the evaporator while adjusting the liquid level to be located in the upper communication pipe. The sewage supply unit and the input side for sucking air are connected to suck out the vapor in the evaporator , and the output side for discharging the air heated to high temperature by compression is connected to the heating can unit to supply the high-temperature compressed steam as a heat source. Air source Comprising a part, the air suction through the evaporator by the air source generating portion, the heating can part and evaporate in the can in the low pressure to facilitate the evaporation of water contained in the wastewater, sequentially supplied by sewage water is vaporized to be, solid pollutants contained in the wastewater so as to accumulate in the lower communicating tube as density large, the solid contaminants and dried sucking from the lower communication pipe waste And the water | moisture content contained in waste water is good also as a structure discharge | released in air | atmosphere in the form of vapor | steam from the pressure control valve of the said heating can part.

The heating can part is composed of a main heating can and a preheating can, and the preheating can has a heat exchanger structure. Sewage is first supplied from the sewage supply part, and the preheated sewage is supplied to the main heating can. You may make it be supplied to this main heating can and this evaporator from the middle of the upper communicating pipe which connects a can and an evaporator.
Further, the preheating can is supplied with steam directly supplied from a steam heat source as the heat source and steam after being used for heating by the main heating can. It is good also as what is provided with the pressure regulation valve made to discharge | release.

  Alternatively, in each of the sewage treatment apparatuses described above in which the input side of the air source generation unit is directly connected to the evaporator, a plurality of combinations of heating cans and evaporators are provided, and the sewage sucked from the lower communication pipe in the previous stage is provided. Supply to the upper communication pipe in the next stage, supply the sewage vapor evaporated from the previous stage evaporator as a heat source for the next stage heating can, and use the steam used as the heat source in the next stage heating can in the previous stage heating can The solid contaminant contained in the sewage is sucked out from the lower communication pipe of the last stage and discarded, and the moisture contained in the sewage is attached to the heating can part of the first stage. It can also be released into the atmosphere from the pressure regulating valve.

As described above, the sewage treatment apparatus of the present invention has the following effects.
(1) The water in the sewage can be discharged into the river in the form of distilled water, or it can be released into the atmosphere in the form of steam.
(2) Although the air source generator is used to evaporate sewage under low pressure, it does not release the high-temperature compressed air from the output side to the atmosphere, and as one of the heating sources of the heating can I used it. Therefore, energy can be reused.
(3) The location conditions of the sewage treatment apparatus are reduced and it becomes easy to install. For example, since it is not necessary to dilute sewage, it can be installed in a place where a large amount of water cannot be secured. Since sewage can be treated continuously rather than batchwise, it can be installed even if there is no land to build a large facility for storing sewage. Even if there is no nearby river that can discharge the water in the sewage, it can be installed because it only needs to be released into the atmosphere.
(4) Since the sewage is evaporated under a low pressure, it evaporates at a low temperature and requires less heating energy.
(5) Since the treatment is performed at a low temperature, the generation of a gas body is small and the generated odor is small.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the sewage treatment apparatus of the present invention. In FIG. 1, 1 is a sewage supply section, 2 is a steam heat source, 3 is a heating can section, 4 is an upper communication pipe, 5 is a lower communication pipe, 6 is an evaporator, 6V is a pressure regulating valve, and 7 is a gas-liquid separation can. , 8 is a cooling water supply unit, 9 is an air source generation unit, and L ₆ is a liquid level.
The sewage supply unit 1 is a part for storing sewage discharged from the office, and is, for example, a sewage storage tank provided with a pump. The steam heat source 2 is composed of, for example, a steam boiler, and provides steam for heating the sewage introduced into the heating can 3.
The heating can part 3 is a part that heats the sewage sent from the sewage supply part 1. Here, it has the same structure as a general heat exchanger, and heat of steam is transmitted to the sewage through the pipe wall surface to heat the sewage.

The evaporator 6 is communicated with the sewage flow portion of the heating can 3 via the upper communication pipe 4 and the lower communication pipe 5, heated sewage is stored in the lower part, and the sewage from the sewage is stored in the upper part. Filled with steam. The heating can 3 and the evaporator ₆ are in communication with each other, and the liquid level L ₆ shown in the drawing indicates the liquid level of the sewage.
The gas-liquid separation can 7 is for introducing steam from the evaporator 6 and cooling it with cooling water from the cooling water supply unit 8 to liquefy water contained in the steam. The structure of the gas-liquid separation can 7 is the same as that of a general heat exchanger. The air source generation unit 9 sucks air on the input side thereof, thereby reducing the pressure in the gas-liquid separation can 7, the evaporation can 6, and the heating can 3 as the suction destination. On the other hand, the compressed air is discharged to the output side. The high-temperature compressed air is sent to the heating can part 3 and used as a part of the heating source.

The sewage treatment operation is as follows.
The sewage in the sewage supply unit 1 is put into the heating can 3, the lower communication pipe 5, and the evaporator 6 from the upper communication pipe 4. The liquid level L ₆ is adjusted so as to be located in the upper communication pipe 4. The reason for adjusting the position is to allow heated sewage to move cyclically through the upper communication pipe 4, the heating can part 3, the lower communication pipe 5, and the evaporator 6. The liquid level L ₆ is adjusted by a liquid level detector (not shown) and a sewage supply pump. When the liquid level L ₆ is lower than the predetermined level, the sewage supply pump for supplying sewage from the sewage supply unit 1 is driven, and when the liquid level L ₆ is higher than the predetermined level, the pump is stopped.

The air source generation unit 9 draws air not only from the gas-liquid separation can 7 but also from the evaporation can 6 and the heating can unit 3 through the can and makes the pressure low. Since the air in the gas-liquid separation can 7 is connected to the air in the evaporator 6, the pressure in the evaporator 6 is also lowered by lowering the gas-liquid separation can 7. However, if the pressure is too low, there is a dangerous aspect. Therefore, a pressure regulating valve 6V is provided so that the pressure does not fall below a predetermined low pressure. That is, when the pressure is lower than the predetermined pressure, the pressure regulating valve 6V is opened and outside air is introduced to prevent the pressure from being lower than the predetermined pressure. Furthermore, since the air in the evaporator 6 is connected to the air in the heating can 3, the pressure in the heating can 3 is also reduced.
Thus, since the inside of the heating can 3 and the evaporator 6 where the sewage is heated is kept at a low pressure, the boiling point of the sewage falls. Therefore, even if not much heat is applied from the steam heat source 2 or the like, steam is actively generated from the sewage. This vapor fills the evaporator 6.
Although the vapor | steam of the evaporator 6 is drawn into the gas-liquid separation can 7, it is cooled with the cooling water from the cooling water supply part 8 here, and is liquefied. The liquefied water is sucked out from the gas-liquid separation can 7 by a pump (not shown). Since this water is obtained by cooling the steam, it is distilled water that has been considerably purified, and can be discharged into rivers and the like.

On the other hand, the solid pollutant contained in the sewage gradually sinks, but the water contained in the sewage evaporates more and more, so that the concentration increases in the vicinity of the lower communication pipe 5 and accumulates. Therefore, sewage liquid containing a large concentration of this solid pollutant (sludge sludge-like liquid ... solid pollutant liquid) is sucked out from the middle of the lower communication pipe 5 by a pump (not shown) and separately dried ( Because it is sludge, it is low in water and easy to dry) and is discarded as a solid.
The air source generation unit 9 for sucking air from the gas-liquid separation can 7 and the like naturally performs the air compression operation, but does not directly release the compressed air into the atmosphere, Supply to can 3. Although it is a well-known phenomenon that when the air is compressed, it becomes a high temperature, but the high-temperature air is not released into the atmosphere, but is used as a part of the heat source of the heating can unit 3, thereby generating the air source generating unit 9. The energy used in can be reused.
The energy obtained by adjusting the temperature of the air to high temperature is the electric energy used for the operation of the air source generation unit 9, so that the electric energy is reused.

FIG. 2 is a diagram illustrating a general structure of the heat exchanger. Although the inside of the heating can part 3 and the gas-liquid separation can 7 is described as having the same structure as the heat exchanger, it is as shown in FIG. In FIG. 2, 10 is a heat exchanger, 11 is a vapor flow gap, 12 is a liquid flow pipe, 13 is a vapor inlet, 14 is a vapor outlet, 15 is a liquid inlet, and 16 is a liquid outlet.
Liquid enters from the liquid inlet 15, passes through the liquid flow pipe 12, and exits from the liquid outlet 16. Steam enters from the steam inlet 13, passes through the steam flow gap 11 (gap between the liquid flow pipes 12), and exits from the steam outlet 14. As the liquid passes through the liquid flow pipe 12, the liquid receives heat from the vapor through the pipe wall and is heated.

(First embodiment)
FIG. 3 is a diagram showing a first embodiment of the present invention. 1 corresponds to that of FIG. 1, 20 is sewage, 21 is a pump, 22, 23, 24 and 25 are pipes, 26 is a main heating can, 27 is a pressure regulating valve, 28 is a preheating can, 29 and 30 are pipes , 31 is a pump, 32 is a storage pit, 33 is a low pressure drying section, 34, 35, and 36 are pipes, 37 is a pump, 38, 39, and 40 are pipes, 41 is a pump, 42 is a check valve, and 43 and 44 are blower 45 is a pressure regulating valve, 46 is a pipe, L ₇ is a liquid level.

In this example, the heating can 3 is composed of a main heating can 26 and a preheating can 28. The internal structure of the preheating can 28 is the same as that of the main heating can 26 as a heat exchanger.
The air source generation unit 9 includes blowers 43 and 44, a pressure adjustment valve 45, and the like. The blower 43 sucks air from the gas-liquid separation can 7 through the pipe 38, and makes the inside low pressure. Since the air passage of the gas-liquid separation can 7 is connected to the evaporator 6 through the pipe 34, the air in the evaporator 6 is also sucked out, and the pressure in the evaporator 6 is also reduced. The sewage can be boiled and evaporated.)

Since air is discharged from the outlet of the blower 43, the air is slightly compressed on the outlet side. The compressed air enters the next stage blower 44 where it is further compressed. Therefore, since the air discharged to the outlet side of the blower 44 is compressed in two stages, it is high-temperature compressed air.
This air is supplied to the pipes 35 and 46. A pressure adjusting valve 45 is connected to the pipe 46, and when the pressure of air becomes equal to or higher than the pressure set by the pressure adjusting valve 45, the valve is opened and communicates with the atmosphere. As a result, the pressure of the air on the output side of the blower 44 is kept below the pressure set by the pressure adjustment valve 45. The high-temperature compressed air that has entered the pipe 35 is sent to the heating can 3 (first main heating can 26) and used as a heating source.

Now, the flow of sewage will be described. The sewage 20 of the sewage supply unit 1 is first sent to the preheating can 28 via the pipe 22 by the pump 21. What is used as a heating source for the preheating can 28 is steam sent from the steam heat source 2 via the pipe 24 and hot air sent via the pipe 25. This high-temperature air is the one in which the steam from the steam heat source 2 and the high-temperature compressed air from the air source generator 9 are used for heating in the main heating can 26 and then mixed and discharged in the main heating can 26. Therefore, it is air mixed with steam.
The steam-mixed air used for heating in the preheating can 28 accumulates in the preheating can 28 and is discharged to the atmosphere through the pressure regulating valve 27 when the pressure exceeds the pressure determined by the pressure regulating valve 27. (Note that the set pressures of the pressure regulating valve 27 and the pressure regulating valve 45 are substantially the same, as can be estimated from the above operation).

The sewage preheated by the preheating can 28 is put into the upper communication pipe 4 through the pipe 29. Since the amount of sewage to be introduced is adjusted so that the liquid level L ₆ is located in the upper communication pipe 4, the sewage is supplied to the main heating can 26, the lower communication pipe 5, the evaporator 6, and the upper communication pipe 4. Can flow through.
Heating in the main heating can 26 is performed by steam sent from the steam heat source 2 through the pipe 23 and high-temperature compressed air sent from the air source generation unit 9 through the pipe 35. This heating is performed under a low pressure much lower than the external atmospheric pressure. This is because the air source generation unit 9 operates to suck out air from the gas-liquid separation can 7 and to suck air out of the evaporation can 6 and the main heating can 26 through the gas-liquid separation can 7. When sewage is heated under low pressure, the water boils at a temperature much lower than 100 ° C. and evaporates. The reason why the low pressure environment is created by the air source generator 9 in the present invention is to evaporate the sewage with less heat.
Note that, as described above, the pressure regulating valve 6V attached to the evaporator 6 is for preventing the pressure from becoming lower than a predetermined low pressure.

As the water in the sewage evaporates, the concentration of the solid contaminant accumulated in the lower communication pipe 5 increases. The sewage liquid that has become thick due to the concentration of solid contaminants is taken out through the pipe 30 connected to the lower communication pipe 5. The extraction is performed by a pump 31 provided in the middle of the pipe 30. The taken out sewage liquid is first stored in the storage pit 32 and then sent to a drying unit, for example, the low-pressure drying unit 33, and discarded as a solid such as powder.
On the other hand, the water evaporated from the sewage is first accumulated in the upper space of the evaporator 6 and then sucked out to the gas-liquid separator 7 through the pipe 34.

In the gas-liquid separator 7, the steam sucked out from the evaporator 6 is cooled with cooling water. The cooling water is supplied from the cooling water supply unit 8 through the pipe 36 by the force of the pump 37, and is recovered to the cooling water supply unit 8 through the pipe 39.
When the steam is cooled, the water is liquefied to become water, which is discharged to the outside by the pump 41. Although the discharge to the outside can be performed as appropriate, for example, at least a certain amount is left at the bottom of the gas-liquid separation can 7 and the discharge is performed when more than that amount is accumulated. That is, the liquid level L ₇ collected at the bottom of the gas-liquid separation can 7 is detected by a detector (not shown). When the liquid level L ₇ exceeds a predetermined value, the pump 41 is driven and passes through the pipe 40. And suck it out. The pump 41 is stopped when the liquid level L ₇ is equal to or less than a predetermined value, it stops the suction of water.
Since this water is produced by distillation, it naturally does not contain solid contaminants and can be discharged into rivers and the like if it meets other standards (eg, acceptable standards for phosphorus and nitrogen). The check valve 42 provided in the middle of the pipe 40 is for preventing water from flowing back by being pushed by the atmospheric pressure when the force of the pump 41 becomes weak.

On the other hand, the air from which moisture has been removed in the gas-liquid separation can 7 is still warm, although the temperature is somewhat lowered. This air is sucked out through the pipe 38 to the air source generator 9. As described above, the air sucked into the air source generation unit 9 is heated to a high temperature by compression by the blowers 43 and 44 in the air source generation unit 9, and the pressure is adjusted by the action of the pressure adjustment valve 45, so that the pipe 35 To the main heating can 26. Thus, as described above, a part of the electric energy used in the air source generation unit 9 is reused as heating energy.
In the example of FIG. 3, steam similar to that used in the main heating can 26 is used as the heat source for the preheating can 28, but other types of heat sources (eg, electric heat) may be used.

The characteristics of the sewage treatment apparatus of the present invention described above are summarized as follows.
(1) It is not necessary to dilute the concentration of sewage for treatment (a large amount of dilute water is unnecessary), and treatment can be performed as long as it has fluidity that can be pumped. For this reason, there is no need for equipment for changing the quality and properties of sewage.
(2) Since the wastewater can be processed while being sent continuously, the generated wastewater can be immediately sent to the treatment (in batch processing where a certain amount of water is stored and then left until the order of treatment comes) Therefore, hygiene management is difficult.)
(3) Since the sewage is heated and evaporated under a low pressure much lower than the atmospheric pressure, less heat energy is required for evaporation and the sewage can be evaporated in a short time.
(4) Since the treatment is performed at a low temperature, the generation of a gas body from the solid contaminants is small, and therefore the odor is small.
(5) The sewage can be finally processed into a form that can be easily discarded, such as a dry solid (eg, powder) and distilled water.
(6) Since the high-temperature compressed air that comes out of the air source generation unit necessary for realizing the low-pressure environment is used as part of the heat source for evaporation, the energy is reused. Less energy is required (in some cases, the steam from the steam heat source is stopped in the middle of the process, and only the high-temperature compressed air from the air source generator is sufficient.)

(Second Embodiment)
FIG. 4 is a diagram showing a second embodiment of the present invention. The reference numerals correspond to those in FIG. 3, and 47 is a pressure regulating valve. The difference from the first embodiment in FIG. 3 is that the preheating can 28 is not used in the heating can 3 and only the main heating can 26 is used.
Depending on the place where the sewage treatment apparatus is installed, a strong steam heat source 2 may be secured. For example, a food company or the like already has a powerful steam boiler installed, from which it can get as much steam as a heating source. In such a place, the preheating can 28 can be omitted.

In the second embodiment, the sewage 20 of the sewage supply unit 1 is put into the upper communication pipe 4 through the pipe 22. Steam from the steam heat source 2 is supplied only to the main heating can 26. The pressure adjustment valve 47 attached to the main heating can 26 corresponds to the pressure adjustment valve 27 attached to the preheating can 28 in FIG. When the pressure of the high-temperature compressed air mixed with steam for heating in the main heating can 26 becomes equal to or higher than the value set by the pressure control valve 47, it opens to the atmosphere and releases the high-temperature compressed air mixed with steam into the atmosphere. To do.
Since the operation of other parts is the same as that of the first embodiment, the description thereof is omitted.

(Third embodiment)
FIG. 5 is a diagram showing a third embodiment of the present invention. The reference numerals correspond to those in FIG. The difference from the first embodiment of FIG. 3 is that the gas-liquid separation can 7 is not provided.
This embodiment is implemented when the place which discards the water distilled with the gas-liquid separation can not be secured (for example, when there is no river to discharge near). In the first and second embodiments, the distilled water coming out of the gas-liquid separation can 7 is discharged to a nearby river or the like, but the discharge standard is strict depending on the type of river, and even the distilled water is discharged. It may not be possible.
For example, phosphorus or nitrogen may be included depending on the type of sewage, but in that case, some of the distilled water from the gas-liquid separation can 7 shown in FIGS. If the content exceeds the discharge standard of the nearby river, it cannot be discharged there.

In the third embodiment, the vapor obtained by evaporating the sewage is not liquefied and is finally released into the atmosphere as the vapor. Even if it contains a little phosphorus or nitrogen as described above, it can be released into the atmosphere without being caught by the release standard.
In the third embodiment, the steam generated by the evaporation of the sewage is sucked out directly from the evaporator 6 through the pipe 34 to the air source generator 9. From the outlet of the air source generation unit 9, high-temperature compressed air mixed with steam is discharged, sent to the main heating can 26 through the pipe 35, and further sent to the preheating can 28 through the pipe 25.
After being used as a part of the heating source in the main heating can 26 and the preheating can 28, it is finally discharged into the atmosphere from the pressure regulating valve 27 attached to the preheating can 28. That is, the water in the sewage is discarded in the form of steam released from the preheating can 28 to the atmosphere. Therefore, the sewage treatment apparatus of the third embodiment can be installed even in a place where there is no river or the like that discharges distilled water.
Since the operation of other parts is the same as that of the first embodiment, the description thereof is omitted.

(Fourth embodiment)
FIG. 6 is a diagram showing a fourth embodiment of the present invention. The reference numerals correspond to those in FIGS. The difference from the third embodiment of FIG. 5 is that the preheating can 28 is not used in the heating can 3 and only the main heating can 26 is used. This embodiment, like the second embodiment of FIG. 4, has already installed a powerful steam heat source, from which a steam as a heating source can be obtained as much as possible (eg, a food company, etc.) However, it is carried out when there is no river nearby where distilled water from sewage can be discharged.
Moisture in the sewage is released into the atmosphere through the pressure regulating valve 47 of the main heating can 26, and solid contaminants in the sewage are discarded in the form of powder or the like from the low-pressure drying unit 33.
Since the operation of each part of the apparatus is the same as that of FIGS. 4 and 5, the description thereof is omitted.

(Fifth embodiment)
FIG. 7 is a diagram showing a fifth embodiment of the present invention. The reference numerals correspond to those in FIG. 6, 50 is the first stage heating evaporation section, 51 is the second stage heating evaporation section, 52 and 53 are pipes, 54 is a pump, 4B is an upper communication pipe, 5B is a lower communication pipe, 6B is an evaporator, 6BV is a pressure regulating valve, 26B is a main heating can, 34B is a pipe, and L _6B is a liquid level.
In this embodiment, the main heating can 26 and the evaporator 6 of the fourth embodiment (FIG. 6) are cascade-connected in two stages. The first stage heating evaporator 50 is mainly composed of the main heating can 26 and the evaporator 6, and the second stage heating evaporator 51 is mainly composed of the main heating can 26B and the evaporator 6B.

Steam (sewage evaporation) discharged from the evaporator 6 of the first stage heating evaporator 50 through the pipe 34 is introduced as a heating source for the next stage main heating can 26B. The liquid (liquid with a high solid contaminant concentration) accumulated in the lower communication pipe 5 of the first stage heating evaporator 50 is put into the upper communication pipe 4B of the next stage through the pipe 52 and the pump 54. And it is heated and evaporated again by the main heating can 26B and the evaporator 6B. As a heating source for the main heating can 26B, in addition to the steam from the pipe 34, high-temperature compressed air supplied from the air source generator 9 through the pipe 35, and steam supplied from the steam heat source 2 through the pipe 23B There is. However, the steam from the steam heat source 2 is only used in an auxiliary manner (for example, only for a while at the beginning of the operation of the apparatus, or when the temperature falls).

  The steam-mixed high-temperature air used in the main heating can 26B is sent to the main heating can 26 through the pipe 53, and again used as one of the heating sources. In the main heating can 26 </ b> B, steam slightly lowered in temperature from the evaporator 6 is used as one of the heat sources. Therefore, it is conceivable that the heating energy is slightly less than that in the main heating can 26. Even in such a case, the set pressure of the pressure regulating valve 6BV may be set slightly lower than the set pressure of the pressure regulating valve 6V in order to sufficiently evaporate. This is because if the pressure is further reduced, the boiling point of the sewage is further lowered, and it will evaporate well even with less heating energy.

The sewage evaporation vapor collected in the evaporator 6B is sucked out to the air source generator 9 through the pipe 34B. The steam is converted into high-temperature compressed air by the air source generator 9, sent to the main heating can 26 B through the pipe 35, used for heating, and further passed through the pipe 53 to the main heating can 26. Steam used for heating (steam sent from the evaporator 6 through the pipe 34 is mixed with steam from the air source generation unit 9 in the main heating can 26B and sent to the main heating can 26 through the pipe 53. .) And finally, it is discharged into the atmosphere from a pressure regulating valve 47 attached to the main heating can 26.
Eventually, the water evaporated from the sewage in the first stage heating evaporator 50 and the second stage heating evaporator 51 is finally released from the pressure regulating valve 47 to the atmosphere. On the other hand, the solid contaminant liquid whose concentration is further increased in the second stage heating evaporation section 51 is sucked out from the lower communication pipe 5B through the pipe 30 by the pump 31, processed in the low pressure drying section 33, etc. The solid matter.
Although FIG. 7 shows an example of two-stage cascade connection, three or more stages can be used. 7 shows the fourth embodiment (FIG. 6) cascaded, but other embodiments (FIGS. 3 to 5) can also be cascaded.

The block diagram which shows the structure of the sewage treatment apparatus of this invention Diagram explaining the general structure of a heat exchanger The figure which shows the 1st Embodiment of this invention The figure which shows the 2nd Embodiment of this invention The figure which shows the 3rd Embodiment of this invention The figure which shows the 4th Embodiment of this invention The figure which shows the 5th Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sewage supply part, 2 ... Steam heat source, 3 ... Heating can part, 3V ... Pressure control valve, 4, 4B ... Upper communication pipe, 5, 5B ... Lower communication pipe, 6, 6B ... Evaporator, 6V, 6BV ... Pressure regulating valve, 7 ... Gas-liquid separation can, 8 ... Cooling water supply unit, 9 ... Air source generation unit, 10 ... Heat exchanger, 11 ... Steam flow gap, 12 ... Liquid flow pipe, 13 ... Steam inlet, DESCRIPTION OF SYMBOLS 14 ... Steam outlet, 15 ... Liquid inlet, 16 ... Liquid outlet, 20 ... Sewage, 21 ... Pump, 22, 23, 23B, 24, 25 ... Pipe, 26, 26B ... Main heating can, 27 ... Pressure control valve, 28 ... Preheating can, 29, 30 ... Pipe, 31 ... Pump, 32 ... Storage pit, 33 ... Low pressure drying section, 34, 34B, 35, 36 ... Pipe, 37 ... Pump, 38, 39, 40 ... Pipe, 41 ... Pump 42 ... Check valve, 43, 44 ... Blower, 45 ... Pressure adjustment valve, 46 ... -Flops, 47 ... pressure regulating valve,
50 ... 1st stage heating evaporation part, 51 ... 2nd stage heating evaporation part, 52, 53 ... Pipe, 54 ... Pump, L ₆ , L _6B , L ₇ ... Liquid level

Claims (8)

A steam heat source,
A cooling water supply unit;
Has a structure of the heat exchanger to evaporate the vapor to below air source water soil in water and sewage by heat exchange to be treated with the hot compressed air is mixed steam from generator from the steam heat source In addition, a heating can part provided with a pressure regulating valve that discharges into the atmosphere when the steam as a heat source exceeds a predetermined pressure, and
An evaporator whose upper and lower sides communicate with each other through the heating can part and an upper communication pipe and a lower communication pipe;
A sewage supply unit that is connected to the middle of the upper communication pipe and supplies the heated can and evaporator while adjusting the level of the sewage to be treated in the upper communication pipe ,
A gas-liquid separation can having a heat exchanger structure, heat-exchanging the sewage evaporating vapor sucked out from the evaporator and the cooling water from the cooling water supply unit, and performing gas-liquid separation of the sewage evaporating vapor;
It connected to suck the input side to suck the air separated by the gas-liquid separation can gases, air source is output to discharge the air to a high temperature is connected to the heating can section so as to supply hot compressed air as a heat source by compression With a generator,
Soil water supplied one after another by sucking air through the gas-liquid separation can by the air source generation unit to make the inside of the heating can and the evaporator low and to easily evaporate water contained in the waste water. by water is evaporated, the solid pollutants contained in the wastewater so as to accumulate in the lower communicating tube as density large, the solid contaminants and discarded dried sucking from the lower communication pipe,
The sewage treatment apparatus is characterized in that water contained in sewage is sucked and discarded after the sewage evaporation vapor is cooled by the gas-liquid separation can to form distilled water.
The heating can part is composed of a main heating can and a preheating can,
The preheating can has a heat exchanger structure, and sewage is first supplied from a sewage supply unit, and the preheated sewage is heated from the middle of the upper communication pipe connecting the main heating can and the evaporator. The sewage treatment apparatus according to claim 1, wherein the sewage treatment apparatus is disposed so as to be supplied to the can and the evaporator. The preheating can is supplied with steam directly supplied from the steam heat source as its heat source and steam after being used for heating by the main heating can, and when the steam exceeds a predetermined pressure, it is released to the atmosphere. The sewage treatment apparatus according to claim 2, further comprising a pressure regulating valve. In the sewage treatment apparatus according to claim 1, 2 or 3, a plurality of combinations of heating cans and evaporators are provided,
Supply the sewage sucked from the lower communication pipe in the previous stage to the upper communication pipe in the next stage,
Supply the sewage evaporation vapor sucked out from the previous evaporator as a heat source for the next heating can,
The last stage evaporator is connected to a gas-liquid separator,
The steam used as the heat source in the heating can part of the next stage is supplied as the heat source of the heating can part of the previous stage,
The solid pollutants contained in the sewage are sucked out from the lower communication pipe at the last stage and discarded, and the water contained in the sewage is made into distilled water in a gas-liquid separation can and then sucked out and discarded. A featured sewage treatment device. A steam heat source,
Has a structure of the heat exchanger, and a sewage to be treated with steam from the steam heat source and below the air source generator with evaporating moisture soil in water by heat exchange, the steam as a heat source is more than the predetermined pressure A heated can part attached with a pressure regulating valve to be released into the atmosphere when
An evaporator whose upper and lower sides communicate with each other through the heating can part and an upper communication pipe and a lower communication pipe;
A sewage supply unit that is connected to the middle of the upper communication pipe and supplies the heated can and evaporator while adjusting the level of the sewage to be treated in the upper communication pipe ,
It is connected to the input side to suck the air suck vapor in the evaporator, and an air source generating portion is output to discharge the air to a high temperature is connected to the heating can section so as to supply the hot compressed steam as a heat source by compression With
The suction of air through the evaporator by the air source generator facilitates the evaporation of moisture contained in the sewage by reducing the pressure in the heating can and the evaporator, and the moisture of the sewage supplied one after another by There is evaporated, the solid pollutants contained in the wastewater so as to accumulate in the lower communicating tube as density large, the solid contaminants and discarded dried sucking from the lower communication pipe,
The sewage treatment apparatus is characterized in that the moisture contained in the sewage is discharged into the atmosphere in the form of steam from the pressure regulating valve of the heating can.
The heating can part is composed of a main heating can and a preheating can,
The preheating can has a heat exchanger structure, and sewage is first supplied from a sewage supply unit, and the preheated sewage is heated from the middle of the upper communication pipe connecting the main heating can and the evaporator. 6. The sewage treatment apparatus according to claim 5, wherein the sewage treatment apparatus is disposed so as to be supplied to the can and the evaporator. The preheating can is supplied with steam directly supplied from the steam heat source as its heat source and steam after being used for heating by the main heating can, and when the steam exceeds a predetermined pressure, it is released to the atmosphere. The sewage treatment apparatus according to claim 6, further comprising a pressure regulating valve. In the sewage treatment apparatus according to claim 5, 6 or 7, a plurality of combinations of heating cans and evaporators are provided,
Supply the sewage sucked from the lower communication pipe in the previous stage to the upper communication pipe in the next stage,
Supply the sewage evaporation vapor sucked out from the previous evaporator as a heat source for the next heating can,
The steam used as the heat source in the heating can part of the next stage is supplied as the heat source of the heating can part of the previous stage,
Solid pollutants contained in the sewage are sucked out from the lower communication pipe in the last stage and discarded, and the moisture contained in the sewage is sent to the atmosphere from the pressure control valve attached to the heating can part in the first stage. A sewage treatment apparatus characterized by being discharged.

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