JP2000024643A - Waste water discharging section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste water discharging section capable of efficiently purifying waste water by freezing and defrosting the waste water containing garbage or the like to effectively utilize energy and simultaneously to accelerate to destroy the structure of the garbage material. SOLUTION: An ice heat storage tank 3 into which the water containing the garbage or the like flows in, a heat combination supply device 6 for concentrating and separating the contained solid matter by the difference of the freezing rate by giving cold to the waste water in the ice heat storage tank and for defrosting the frozen water to enable to destroy the structure of the contained solid matter by the freezing operation and the defrosting operation and a waste water treating tank 4 for purifying the defrosted waste water are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to purification of wastewater generated from condominiums and other wastewater produced in the treatment of wastewater from garbage, gray water and sewage, and more particularly to solid waste of kitchen refuse as a heat storage medium for power waste heat and industrial use. The present invention relates to a wastewater treatment device that stores ice heat using waste heat and nighttime electric power and uses the energy.

[0002]

2. Description of the Related Art With the spread of home appliances, computers, air conditioners, etc., the demand for electric power has been increasing rapidly year by year, and the peak load especially in summer has been increasing. However, there are many problems such as environmental conservation and difficulty in locating a power plant. It is also difficult to increase the power. Under these circumstances, in recent years, as a method of storing excess heat during the night by using surplus inexpensive nighttime power and leveling the peak power in the daytime, the method using ice heat storage has been mainly used for newly built commercial buildings. It has been spreading.

[0003] In the conventional ice heat storage method, cold heat is supplied to a refrigerant such as tap water or a heat storage material filled in an ice heat storage tank having an adiabatic closed structure via an external heat source, cooled to a temperature below ice temperature, and subjected to a freezing process. The basic principle is that the cold energy is stored in the form of ice, and the adiabatic stored ice is melted to recover and use the cold when necessary.

On the other hand, the amount of water used is increasing year by year, and limited water resources are not polluted and drained, but are reused or purified and discharged so as not to have an adverse effect on the environment. There is increasing recognition that conserving water resources is also an important initiative. In recent years, regarding the conservation of water resources, wastewater has been treated in factories, companies, or regions, and purified water has been reused as flush water for flush toilets and sprinkling water. Similar water reuse initiatives have also begun in residential areas such as and residential complexes.

[0005] In addition, kitchen waste such as garbage generated in restaurant kitchens and home kitchens is difficult to burn at high temperature because it accounts for 30% of combustible garbage and has a large amount of water. It is one of the hated things.

[0006] In the treatment of kitchen garbage, a system for purifying kitchen garbage with water and a system for purifying the kitchen garbage together with sewage have been proposed. Therefore, it has been attracting attention as a system that can save the trouble of garbage disposal.

[0007] As described above, the leveling of energy by ice storage and the treatment of wastewater containing kitchen waste are highly effective for environmental preservation and improvement of the living environment, and both systems use or treat liquid. Have in common. Focusing on this common point, a system in which the heat storage function and the water treatment function are docked has already been proposed.For example, a heat storage method for making ice and storing ice by directly using wastewater from a building or the like has been proposed.
It has been proposed in JP-A-6-18069 and JP-A-10-73290.

An ice heat storage method described in Japanese Patent Application Laid-Open No. 6-18069 discloses a method of supplying and circulating a refrigerant from a refrigerant supply device to a heat transfer tube immersed in treated sewage introduced into an ice heat storage tank. It is configured to partially make ice around and discharge remaining unfrozen residual water to the outside of the tank. FIG. 5 schematically shows the configuration.

In FIG. 5, the sewage to be treated is a sewage receiving tank 10.
1 and is taken out by the sewage feed pump 102 and sent to the screen device 103 to remove coarse dust and the like. The refuse removed by the screen device 103 is discharged to a drain tank 104. Then, the sewage to be treated from which the refuse is removed is sent to an oil-water separator 105 to separate the oil component, the oil component is discharged to a drainage tank 104, and the sewage to be treated excluding the refuse and the oil component is supplied to a treatment sewage receiving tank. Stored in 106.

In the ice heat storage tank 108, a refrigerant is supplied from the refrigerant supply device to the heat transfer tube and circulated to make ice around the heat transfer tube, and the remaining non-freezing residual water remaining thereafter is discharged out of the tank by the residual water discharge pump 109. . At the stage of discharging the unfrozen residual water from inside the ice heat storage tank 108, a part of the treated sewage is passed from the treated sewage receiving tank 106 through the heat exchanger 110 for recovering residual water cooling heat, and the ice heat storage tank 10
The non-freezing residual water discharged from 8 is subjected to cold heat exchange, and the cold stored in the non-freezing residual water is collected in the treated sewage and stored in the cold treated sewage receiving tank 111 as the cold treated sewage.

[0011] The remaining treated sewage from the treated sewage receiving tank 106 is stored in the chilled sewage receiving tank 111 through the middle water chilled heat recovery heat exchanger 118 and sent to the ice heat storage tank 108 by the chilled sewage feed pump 112. Cold treatment sewage receiving tank 11
After the cold treated sewage from 1 drains the unfrozen residual water from the ice heat storage tank 108, the cold water is injected into the ice heat storage tank 108 from the cold water receiving tank 116 by the cold water circulation pump 121, and the cold water is loaded. Circulating water as a circulating water through a load circulating water line including a cold heat supply heat exchanger 114 and a pump 113,
A heat exchanger 1 for supplying cold energy to the cold stored by the ice around the heat transfer tubes.
14 to a load 115.

The cold water containing the thawed water in the ice heat storage tank 108 from which the cold heat has been completely recovered in the cold heat supply heat exchanger 114 is discharged as cold cold water into the cold cold water receiving tank 116 and stored. Cold and middle water feed pump 1 from the cold and middle water receiving tank 116
The cold water is taken out by 17 and passed through a heat exchanger 118 for recovering cold water from middle water to exchange heat with the treated sewage, and the cold stored in the cold water is recovered in the treated sewage. The cold water from which the cold energy has been recovered is stored in the middle water tank 119 as middle water, and is appropriately taken out by the middle water supply pump 120 and used as toilet water.

On the other hand, the apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 10-73290 is one in which an ice producing unit and a heat storage water tank are separated from each other, and ice is not made in the ice heat storage tank. And accumulate ice in the heat storage water tank,
Wastewater other than ice is discharged from the ice machine. FIG. 6 shows the outline.

Various wastewaters from buildings and the like are stored in a drainage tank 201 and sent to an ice maker 202. Ice machine 2
Numeral 02 is for producing pure ice by nighttime electric power controlled by the monitoring control device 203. Pure ice produced by the ice making machine 202 is accumulated in an ice heat storage water tank 204. The ice maker 202 is provided with a function of separating sewage,
The sewage separated by the ice making machine 202 is supplied to a sewage treatment apparatus 205.
Will be introduced. The condensate used for the load side air conditioner 206 is also introduced into the condensate water storage tank 207, and the condensate is also periodically made into pure ice by the ice maker 202.

[0015]

However, in the above-mentioned conventional heat storage method and waste water treatment apparatus, only a part of the water in the waste water is frozen in the ice heat storage.
It merely reuses part of the water and does not fully exploit the benefits of freeze-thaw processing in the heat storage tank.

In general, solids such as kitchen garbage are mostly vegetable waste, fish and shellfish and meat residues and bones, and all contain biological cells. For this reason, kitchen garbage itself is finely crushed by a crushing device such as a kitchen or kitchen disposer, but in particular, vegetables comprising fiber components are hardly destroyed by cells constituting the garbage. Therefore, when performing biological treatment or the like in the subsequent wastewater treatment tank, the cell membrane or cell wall functions as a kind of protective wall, which may cause a longer treatment time.

On the other hand, vegetables and the like have a very high internal water content, and it is understood that cell walls and cell membranes are affected by freezing when subjected to freezing and thawing. The freeze-thaw treatment is for reusing a part of water, and no consideration is given to the improvement of the treatment capacity in the subsequent wastewater treatment, and it is difficult to treat garbage such as vegetables having a strong cell membrane.

Therefore, the problem to be solved in the present invention is to promote efficient destruction of wastewater by promoting the destruction of the tissue of kitchen waste while effectively utilizing energy by freezing and thawing wastewater containing kitchen waste in the heat storage tank. It is an object of the present invention to provide a wastewater treatment device that can perform the treatment.

[0019]

SUMMARY OF THE INVENTION The present invention provides an ice heat storage tank into which wastewater containing kitchen waste and the like flows, and cools the wastewater in the ice heat storage tank to concentrate and separate solid components contained therein by a difference in freezing speed. A combined heat and heat supply device capable of defrosting the frozen wastewater and destroying the tissue of the solid content by the freezing and thawing operations, and a wastewater treatment tank for purifying the thawed wastewater. And

With this configuration, the degree of purification is improved by separating solids from the kitchen wastewater and destructing the tissue, and water can be reused and energy can be effectively used by storing heat.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is characterized in that an ice heat storage tank into which waste water including kitchen wastes flows in and a difference in the freezing rate of the solid component contained by applying cold to the waste water in the ice heat storage tank. The apparatus is provided with a cogeneration system capable of decomposing the frozen wastewater while concentrating and separating the frozen wastewater and destroying the tissue of the solid matter contained in the frozen and thawed operation, and a wastewater treatment tank for purifying the thawed wastewater. The wastewater treatment system is characterized by the fact that it cleans the garbage, etc., in which the tissue has been destroyed, so that the purification speed is increased, or the purification degree is improved, and the water is reused and the energy is efficiently used by storing heat. Can be performed simultaneously.

According to a second aspect of the present invention, in the ice heat storage tank,
The wastewater treatment apparatus according to claim 1, further comprising a freezing adjusting unit that freezes the wastewater from an upper position to a lower position, and collects clean water at an upper position and a tissue at a lower position. It is possible to concentrate and separate the paste-like solids that have been destroyed, etc., and have the effect that the clean water in the upper position can be separated and extracted and reused.

According to a third aspect of the present invention, in the ice thermal storage tank,
The wastewater treatment device according to claim 1 or 2, further comprising a molten water filtration unit for filtering the thawed wastewater, which has an effect of efficiently separating solids and water from the thawed wastewater.

According to a fourth aspect of the present invention, a coarse filtration unit is provided at a position near the lower side of the freezing adjustment unit, and the solid component remaining in the coarse filtration unit is supplied to the co-heating unit before the coarsely filtered wastewater. Since the wastewater treatment device according to claim 1, wherein the wastewater treatment device is frozen by a device, tissue destruction of kitchen garbage and the like remaining by rough filtration is efficiently performed, and the purification speed in the wastewater treatment tank is further increased, or It has the effect of further improving the degree of purification.

According to a fifth aspect of the present invention, there is provided the drainage temperature adjusting means for heating the wastewater containing the solid matter separated in the ice heat storage tank. Therefore, the temperature of the wastewater flowing into the wastewater treatment tank can be adjusted to a temperature suitable for wastewater treatment, and has the effect of stabilizing the performance of the wastewater treatment tank.

In the present invention, the concentration separation means that when kitchen wastewater is frozen, free water is frozen from the clean water due to the difference in the freezing speed of water and the solid component contained therein. When concentrated and denatured and coagulated, and then thawed, the water is easily dehydrated, and finally the solid remains in the form of a paste.

Hereinafter, the present invention according to the embodiment shown in the drawings will be specifically described. FIG. 1 shows an overall configuration diagram of a wastewater treatment apparatus according to an embodiment of the present invention.

In FIG. 1, a wastewater treatment apparatus 1 is a primary storage tank 2 for temporarily storing wastewater including kitchen waste and miscellaneous wastewater and adjusting the amount of wastewater to be treated in a later stage, and is connected to the primary storage tank 2 by piping. An ice heat storage tank 3 that performs an effect as a heat storage tank while performing freezing and thawing treatment of waste water and miscellaneous waste water containing kitchen waste, a waste water treatment tank 4 that purifies waste water discharged from the ice heat storage tank 3, The apparatus is provided with a cogeneration system 6 for generating and utilizing heat energy for cooling and heating the ice heat storage tank 3. An air-conditioning unit 8 is connected to the heat and heat supply device 6 that is operated and operated by the power supply unit 40 and receives air from the heat and heat supply device 6 to cool and heat the inside of a building or a room. The primary storage tank 2 is a sewage pipe 1 for supplying miscellaneous wastewater discharged from a toilet, a washroom, a washing machine, and a bath.
The sewage pipe 10 is connected to a flow path from a disposer 9 installed in a building kitchen or a home kitchen for crushing garbage.

The heat cogeneration device 6 may be any heat cycle device that can generate and use cold and hot heat, but the use of the power source 40 can be reduced by using waste heat in a power plant or an industrial area. In such a case, a means such as a heat pump or an absorption refrigeration cycle that can use waste heat is desirable because energy can be saved.

In the arrangement of the above-described devices, the wastewater treatment apparatus 1 includes a wastewater supply pump 1 for controlling the transfer of wastewater stored in the primary storage tank 2 to the ice heat storage tank 3.
1. A thawing water discharge pump 12 for controlling the transfer of the thawing water from the ice heat storage tank 3 to the wastewater treatment tank 4, and an initial melting water pump 13 for discharging the initial melting water during the thawing processing of the ice heat storage tank 3 are incorporated. It is.

Inside the ice heat storage tank 3, there is provided a filtration unit 21 for taking out the initial melt water during the freeze-thaw treatment and filtering and remaining solid matter, and is connected to the co-heating unit 6 on the upper and lower sides. An upper ice storage tank heat exchanger 30a and a lower ice storage tank heat exchanger 30b that freeze-thaw the kitchen wastewater and store heat energy are disposed, respectively.

In the wastewater treatment tank 4, a purification treatment section 22 for purifying wastewater by biological treatment, coagulation treatment, electrolytic purification, or the like, and a sedimentation section for sedimenting the sludge of the treated water from the purification treatment section 22 are provided. 23 are provided. Purification processing unit 2
2 incorporates a heating heat exchanger 32 connected to the cogeneration system 6 for temperature adjustment inside. The settling unit 23 is capable of separating sludge 24 therein and treated water 25 in which the sludge 24 has settled and purified, and a pump for distributing the treated water 25 to a wastewater utilization facility or the like. A water discharge pipe 26 is connected through the connection 15.

In the above arrangement, the kitchen garbage discharged is pulverized while being supplied with water by a disposer 9 installed in a kitchen of a building or a home kitchen, and discharged to the primary storage tank 2 as a crushed product of the kitchen. Is done. At the same time, miscellaneous wastewater from the washroom and the washing machine is also discharged to the primary storage tank 2 through the sewage pipe 10. Then, the wastewater primarily stored in the primary storage tank 2 is supplied to the ice heat storage tank 3 by the operation control of the drainage supply pump 11.
Supplied to

In the ice heat storage tank 3, drainage from the primary storage tank 2 flowing into the ice heat storage tank 3 is performed by the upper ice heat storage tank heat exchanger 30 a and the lower ice heat storage tank heat exchanger 30 b connected to the cogeneration unit 6. Is frozen at a temperature below the ice temperature, and then thawed at a temperature above the ice temperature.

Here, in the ice heat storage tank 3, the freezing and thawing treatment of the waste water is performed in a batch system. That is, the treated water generated during the middle of the day is stored in the primary storage tank 2 and is transferred to the ice heat storage tank 3 by controlling the operation of the drainage supply pump 11 at an early time at night. When a certain amount of wastewater is stored in the ice heat storage tank 3, the cogeneration unit 6 is operated to send cold heat to the upper ice heat storage tank heat exchanger 30a and the lower ice heat storage tank heat exchanger 30b to start the freezing process. Then, the contents of the ice heat storage tank 3 are frozen.

The upper ice storage tank heat exchanger 30a is an ice storage tank 3
Is located above, first, when the cold heat is sent to the upper ice storage tank heat exchanger 30a, the freezing process starts from above,
It gradually spreads downward. That is, it freezes gradually from the upper side to the lower side. Note that the number of the ice storage tank heat exchangers is not limited to two, and any number may be provided, as long as the heat can be gradually frozen from the upper side to the lower side.

Hereinafter, the frozen state will be described. In the freezing of an aqueous solution, the freezing start temperature of pure water is 0 ° C.
It is. However, in the case of an aqueous solution containing kitchen waste or the like, the freezing point of water is lowered, and the freezing temperature is reduced in correlation with the concentration of solid components such as kitchen waste.

Now, when the temperature of the upper heat storage tank heat exchanger 30a of the ice heat storage tank 3 is lowered below the freezing point, the aqueous solution near the upper heat storage tank heat exchanger 30a tends to freeze. At this time,
When freezing is performed gently without adding agitation or the like, freezing starts from an aqueous solution having a low concentration of solid components such as kitchen waste, that is, a high freezing temperature. As a result, in the process of freezing, a layer of ice closer to fresh water having less solid components is formed near the upper ice storage tank heat exchanger 30a, and the solid components become more distant from the upper ice storage tank heat exchanger 30a. Many ice layers are formed.

The upper ice storage tank heat exchanger 30a is an ice storage tank 3
The freezing process starts from the top and gradually spreads downward, adding the sedimentation effect of the solid component due to gravity, so that clean ice is formed upward, and solids gradually increase from the top to the bottom. Rich ice is formed. After a certain period of time, if the freezing has progressed from the vicinity of the upper ice storage tank heat exchanger 30a of the ice storage tank 3 to the vicinity of the portion where the lower ice storage tank heat exchanger 30b is disposed, the lower ice storage tank heat exchanger 3
0b is supplied with cold heat to freeze below the ice heat storage tank 3 as well.

When the whole of the ice heat storage tank 3 is frozen, finally solidified substances such as kitchen refuse which have settled are also frozen. At this time, vegetable scraps and the like contained in kitchen waste also freeze the solution and tissue in the cells constituting them, so that the cells such as vegetable scraps are destroyed by the effects of ice volume expansion and freeze denaturation during freezing. Becomes brittle.

On the next day, the frozen wastewater is thawed while recovering the cold heat by the upper heat storage tank heat exchanger 30a and the lower heat storage tank heat exchanger 30b of the ice heat storage tank 3. The recovered cold heat is sent to an air conditioning unit 8 installed in a building or a room to be used as a heat source for cooling or the like.

When the above-mentioned freeze-thaw treatment is performed, solids such as kitchen garbage are also frozen and then thawed, so that vegetable garbage having a high water content is particularly degraded by the expansion deformation of ice and the denaturation by freeze-thawing. Tissue cells are destroyed. In addition, ice of clean water is formed upward due to the influence of freezing point depression and then thawed. Therefore, when the wastewater is thawed from the upper heat storage tank heat exchanger 30a, the initial melting water at the time of thawing becomes solid component. Melts out as water with little water. This is controlled by the operation of the initial molten water pump 13 through the filtration unit 21 to discharge the water from the discharge pipe 26.
Water. As a result, the wastewater in the ice heat storage tank 3 is concentrated by the amount of the released clean water. After the thawing process, the wastewater is transported to the wastewater treatment tank 4.

As described above, according to the present invention, the garbage in the wastewater can be denatured and coagulated in the freezing and thawing treatment, and the solid-liquid separation can be facilitated. Here, the denaturation and aggregation of kitchen waste in drainage will be described.

In a state in which the solids such as the crushed garbage are in a suspended state, pore water having a weak binding force exists around the particles of the solids such as the crushed garbage. When freezing garbage wastewater containing solid matter such as crushed garbage containing pore water, it starts freezing from water with high purity and a high freezing point, and freezes as the ice grows. I do. As a result, the pore water existing between the solids is easily sucked out by the growing ice and disappears, and as a result, the solids such as the crushed garbage approach and aggregate. When the freezing temperature is further reduced and the freezing proceeds, the internal water inside the cells such as garbage as a solid material such as crushed garbage is frozen, the cell wall is broken, and the internal water is also sucked out. This further improves cohesion and dehydration.

As described above, as a result of the freeze-thaw treatment, solids such as kitchen garbage in a suspended state are easily aggregated and dehydrated, so that solid-liquid separation can be easily performed.
Conventionally, there is no technical idea about such solid-liquid separation by denaturation aggregation, and concentration and separation can be easily and effectively obtained by freezing operation and denaturation aggregation.

On the other hand, the purification treatment section 22 of the wastewater treatment tank 4 mainly purifies wastewater by decomposing or coagulating solids in the wastewater and fixing, decomposing and oxidizing soluble organic components. The sludge 24 generated in the purification processing section 22
, And the purified water 25 becomes purified water which is desirable to discharge. The treated water 25 is discharged from a water discharge pipe 26 to an intermediate water utilization facility or the like, and the settled sludge 24 is periodically sucked out by a vacuum car or the like and taken out.

Further, when the purification means in the purification section 22 is susceptible to the temperature of water such as a biological treatment method, an extreme decrease in temperature is not preferable for maintaining the treatment capacity. It is preferable to heat and keep the temperature by the heating heat exchanger 32.

FIG. 2 shows an overall configuration diagram of a wastewater treatment apparatus according to another embodiment of the present invention. This example is different in that a coarse filtration panel 19 is rotatably provided instead of the lower ice heat storage tank heat exchanger 30b in the configuration of FIG. 1, and the other configuration is the same. Note that the same components as those in the example of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

The coarse filter panel 19 is a plate-like material having a large number of holes formed therein. The coarse filter panel 19 is incorporated in the ice heat storage tank 3 and removes relatively large solid matter in wastewater including garbage from the primary storage tank 2. Filter. Then, it has a role of dropping the solid matter subjected to the freeze / thaw processing under the rotation control by the coarse filtration panel drive unit 20 using a motor into the wastewater.

FIG. 3 is a schematic view showing the coarse filtration panel 19 and its driving section. In order not to interfere with the upper ice storage tank heat exchanger 30a, the panel is rotated in the range indicated by the arrow in the figure. Control.

The passing particle size of the solids passing through the holes of the coarse filtration panel 10 is about 0.5 to 5.0 mm in which solids such as vegetable chips pulverized by the disposer 9 remain, and is 1 m.
m is preferable. In addition, the coarse filtration panel 1
Reference numeral 9 may be any type, such as a double-opening structure in which the left and right are gear-coupled or a roll-in type, as long as a relatively large solid can be retained and subsequently discharged.

In the waste water purifying apparatus shown in FIG. 2, when waste water is supplied from the primary storage tank 2 to the ice heat storage tank 3, the coarse filtration panel 19 is held in a substantially horizontal posture as shown in FIG. . Then, the supplied wastewater containing garbage and the like hits the coarse filtration panel 19 and is roughly filtered, and relatively large solid garbage remains on the coarse filtration panel 19. At this time, since the relatively large solid garbage remains on the rough filtration panel 19 and the upper ice heat storage tank heat exchanger 30a is disposed in the vicinity thereof,
When cold heat is supplied to the upper ice storage tank heat exchanger 30a, residual kitchen waste on the coarse filtration panel 19 freezes first.

In the configuration in which the coarse filtration panel 19 is provided, the kitchen waste remaining thereon is placed near the upper ice storage tank heat exchanger 30a. 3 can be achieved without freezing the whole. Therefore, for example, even when the heat storage amount is small, the ice heat storage tank 3
It is not necessary to freeze the whole, and even when it is not possible to store sufficient cold heat, the tissue cells of vegetable waste can be destroyed, and the processing performance of the wastewater treatment tank 4 at the subsequent stage can be stabilized.

FIG. 4 shows an overall configuration diagram of a wastewater treatment apparatus according to still another embodiment of the present invention. This example has a configuration in which a thawed water storage tank 17 between the ice heat storage tank 3 and the wastewater treatment tank 4 is incorporated. And this thawing water storage tank 1
A drainage adjustment pump 18 is provided in the flow path between the drainage treatment tank 4 and the drainage treatment tank 4 while adjusting the flow rate of the wastewater. And a heat exchanger 37 for keeping and heating the water for adjusting the temperature of the waste water. The other configuration is the same as the example of FIG.

In the configuration shown in FIG. 4, the wastewater defrosted in the ice heat storage tank 3 is stored in the defrosted water storage tank 17 via the defrosted water discharge pump 12. At this time, the temperature of the wastewater is generally a low temperature of about 5 to 15 ° C. However, if the treatment method of the purification processing unit 22 of the subsequent wastewater treatment tank 4 is a biological method or the like affected by the temperature, Temperatures as low as 5-15 ° C are not preferred.

Then, the temperature of the waste water is heated to 15 to 50 ° C. by using the heat exchanger 37 for keeping heat in the thawed water storage tank 17. 25-40 ° C as temperature suitable for biological treatment
It is preferable to be within the range.

Further, by controlling the operation of the drainage adjusting pump 18 to stabilize the amount of wastewater flowing into the downstream wastewater treatment tank 4, the operation of the wastewater treatment tank 4 can be stabilized.

The heating operation in the thawing water storage tank 17 is performed as follows.
If it is used as pre-cooling of the refrigerant on the return side of the air conditioning unit 8 during the cooling operation, or as auxiliary heat release during the freezing operation of the ice heat storage tank 3, the cold heat of the thawed water storage tank 17 is effectively used. Available to

[0059]

According to the first aspect of the present invention, kitchen waste and the like in which tissues and the like are destroyed are subjected to wastewater purification, so that the purification speed is increased, the degree of purification is improved, and water is reused and energy is efficiently used by storing heat. Becomes possible at the same time.

According to the second aspect of the present invention, clean water can be collected at the upper position, and paste-like solids with broken tissue can be concentrated and separated at the lower position, and the clean water at the upper position can be separated and extracted. And can be reused.

According to the third aspect of the present invention, solids and water can be efficiently separated from the thawed wastewater.

According to the fourth aspect of the present invention, tissue destruction of kitchen garbage and the like remaining by the coarse filtration is efficiently performed, the purification speed in the wastewater treatment tank is further increased, and the purification degree can be further improved.

According to the fifth aspect of the present invention, the temperature of the wastewater flowing into the wastewater treatment tank can be adjusted to a temperature suitable for wastewater treatment.
The performance of the wastewater treatment tank can be stabilized.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a wastewater treatment apparatus according to an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a wastewater treatment apparatus according to another embodiment of the present invention.

FIG. 3 is a schematic diagram of a coarse filtration device used in the configuration of FIG. 2;

FIG. 4 is an overall configuration diagram of a wastewater treatment apparatus according to still another embodiment of the present invention.

FIG. 5 is a diagram showing a conventional technique described in Japanese Patent Application Laid-Open No. 6-18069.

FIG. 6 is a diagram showing a conventional technique described in JP-A-10-73290.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wastewater treatment apparatus 2 Primary storage tank 3 Ice heat storage tank 4 Wastewater treatment tank 6 Cogeneration system 8 Air conditioning unit 9 Disposer 10 Sewage piping 11 Wastewater supply pump 12 Thawing water discharge pump 13 Initial melting water pump 15 Water discharge pump 17 Thawing water storage tank Reference Signs List 18 Drainage adjustment pump 19 Coarse filtration panel 20 Coarse filtration panel drive unit 21 Filtration unit 22 Purification treatment unit 23 Settling unit 24 Sludge 25 Purification treatment water 26 Discharge pipe 30a Upper ice storage tank heat exchanger 30b Lower ice storage tank heat exchanger 32 Heat exchanger for heating 37 Heat exchanger for insulated heating 40 Power supply

Claims (5)

[Claims] 1. An ice heat storage tank into which wastewater containing kitchen waste and the like flows in, and a cooling water is given to the wastewater in the ice heat storage tank to concentrate and separate solid components contained in the ice heat storage tank at different freezing speeds and to thaw the frozen wastewater. A waste heat treatment apparatus comprising: a heat and heat supply device capable of destroying the tissue of the solid content by the freezing operation and the thawing operation; and a waste water treatment tank for purifying the thawed waste water. 2. The wastewater treatment apparatus according to claim 1, wherein the ice heat storage tank is provided with a freezing adjusting section for freezing the wastewater from an upper position to a lower position. 3. An ice heat storage tank is provided with a molten water filtration section for filtering thawed waste water.
The wastewater treatment device as described in the above. 4. A coarse filtration unit is provided at a position near the lower side of the freezing adjustment unit, and solid components remaining in the coarse filtration unit are frozen by the cogeneration device before the coarsely filtered wastewater. The wastewater treatment device according to claim 1, wherein 5. The wastewater treatment apparatus according to claim 1, further comprising a wastewater temperature adjusting means for heating wastewater containing solid matter separated in the ice heat storage tank.