JP2001062443A - Waste water discharging method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently deodorize and detoxicate the condensed and separated solid particles in food industry waste water or the like by mixing adsorbent with the waste water, bringing the waste water into direct contact with air having a specific temp., evaporating and separating water equal to or above a specific ratio in the waste water and dehydrating the evaporation residual liquid. SOLUTION: The waste water, such as seed rice sterilization waste water 14 is introduced into a waste waster treating vessel 3 from a waste water introducing port 27. A combustion exhaust gas is introduced into an introducing pipe 11 from a discharge port 13 of a combustion device 12, the waste water 14 is heated and introduced into a branched pipe part 9 to be mixed with air to form a gaseous mixture and the gaseous mixture is introduced into a waste water evaporation vessel 2 from an opening part 6 through a gaseous mixture introducing pipe 7. The heated waste water 14 is taken out from a take-out port 24 by a feed pump 25, introduced into a cleaning waste waster spray device 20 from a pipe passages 26 and sprayed from a nozzle 19. In such a case, the waste water is brought into direct contact with the air heated to <=60 deg.C and >=60 wt.% water in the waste water is evaporated and separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating wastewater, especially wastewater having odors such as food industry wastewater, livestock industry wastewater, and agricultural wastewater. The present invention relates to a wastewater treatment method and apparatus that concentrates and separates solid particles in wastewater by evaporating most of the water in the wastewater.

[0002]

2. Description of the Related Art Odors such as food industry wastewater, livestock industry wastewater and agricultural wastewater, especially odorous odors, are mainly organic wastewaters, contain solid particles, decay quickly, cause water pollution, and have a bad odor. In order to cause this, solid particles are separated by settling and separated, the supernatant is discharged, and the separated solid particles are used as fertilizers or incinerated.

[0003]

However, the wastewater from the food industry, livestock industry and agricultural wastewater, even after the solid particles have been separated, contain an organic component in the supernatant liquid. Medium and pesticides are toxic and are adsorbed and removed by the adsorbent filtration layer.To ensure sufficient contact with the adsorbent coagulant, multiple adsorbent filtration towers are installed, It is. Organic components dissolved in food industry wastewater or livestock industry wastewater undergo decay and generate an odor, and are treated with activated sludge or the like. In addition, harmful components in the exhaust gas are removed from the combustion gas generated in the incineration of the activated sludge waste by washing or the like. However, this exhaust gas treatment is problematic at high cost. An object of the present invention is to solve the problems associated with the treatment of organic components and pesticides in wastewater obtained by centrifuging solid particles of wastewater such as food industry wastewater, livestock industry wastewater, and agricultural wastewater. Further, the present invention relates to a wastewater obtained by centrifuging solid particles of wastewater such as food industry wastewater, livestock industry wastewater, and agricultural wastewater, a problem related to the treatment of organic components and pesticides, and a problem related to the treatment of combustion gas such as waste. It aims to solve the point.

[0004]

SUMMARY OF THE INVENTION The present invention provides a wastewater treatment method capable of detoxifying wastewater, such as food industry wastewater, livestock industry wastewater, and agricultural wastewater, and particularly odorous wastewater, while eliminating the odor. And a wastewater treatment apparatus. Another object of the present invention is to provide a wastewater treatment method and a wastewater treatment device that can provide the wastewater treatment and the wastewater treatment device and can perform the combustion gas treatment with a simple and small device.

That is, the present invention comprises mixing an adsorbent with wastewater,
The wastewater mixed with the adsorbent is brought into direct contact with air heated to a temperature of 60 ° C. or lower to evaporate and separate 60% by weight or more of the water in the wastewater, and to dewater the residual evaporation. The present invention also provides a wastewater treatment method for mixing wastewater containing solid particles with an adsorbent, and heating the wastewater mixed with the adsorbent to a temperature of 60 ° C. or lower with a combustion gas,
The heated wastewater is dispersed in the form of droplets in air heated to a temperature of 60 ° C. or lower by the combustion gas, and 60% by weight or more of the water in the wastewater is evaporated, whereby the solid particles are concentrated. The wastewater treatment method is characterized in that the evaporation residue is dewatered and solid particles in the wastewater are separated as a cake from the evaporation residue.

Further, the present invention provides a wastewater evaporation treatment tank having a side wall provided with an air introduction opening and a bottom plate provided with a wastewater discharge opening, and a lower part of the wastewater evaporation treatment tank. A circulating water removal opening containing an adsorbent,
A wastewater treatment tank provided with a wastewater introduction opening and a sediment discharge opening, and a wastewater storage section through which a heating pipe connected to the combustor is provided, and a bottom plate of the wastewater evaporation treatment tank. A tubular connection member, one end of which is connected to the opening for discharging the washing wastewater and the other end of which is located in the wastewater reservoir of the wastewater treatment tank, and the position of the air introduction opening in the wastewater evaporation treatment tank. A wastewater dispersion device is provided at a higher position, and a mist separator is provided at an outlet side of the wastewater dispersion device.The wastewater dispersion device of the wastewater evaporation treatment tank is provided with a wastewater treatment tank. The wastewater treatment apparatus is connected to a pipeline connected to a circulating water extraction opening via a liquid feed pump, and the present invention is further provided with an air introduction opening. Side walls and bottom with wastewater discharge openings A wastewater evaporation treatment tank supported by an upper support frame member, and a wastewater removal opening, a wastewater introduction opening, and a sediment removal opening containing an adsorbent below the wastewater evaporation treatment tank. Part is provided,
One end is provided at a wastewater treatment tank supported by a lower support frame member, and a wastewater discharge opening at a bottom plate of the wastewater evaporation treatment tank. A tubular connection member connected to the other end of the wastewater treatment tank and located in a wastewater storage section of the wastewater treatment tank, and in the wastewater evaporation treatment tank,
A wastewater dispersion device is provided above the position of the air introduction opening, and a mist separator is provided on the outlet side of the wastewater dispersion device, and the mist separator is provided below the wastewater dispersion device. A water droplet disperser is provided at a position, and a combustion gas outlet of a heating pipe of the wastewater treatment tank is connected to an air introduction pipe connected to an air introduction opening of the wastewater evaporation treatment tank. The wastewater dispersing device of the wastewater evaporation treatment tank is connected to a pipeline connected to a circulating water extraction opening of the wastewater treatment tank via a liquid feed pump, and the upper support frame member is connected to the lower support frame member. A wastewater treatment apparatus characterized by being supported.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, wastewater is
Wastewater containing organic matter such as food industry wastewater, livestock industry wastewater, and agricultural wastewater, containing or not containing solids, and particularly having odor. In the present invention, an adsorbent is mixed with wastewater having such an odor in order to prevent the odor generated during evaporation from the wastewater. Such adsorbents are preferably fine in correspondence with the solids in the wastewater. In the present invention, as the adsorbent, generally used adsorbents such as activated carbon, zeolite, and polymer adsorbent can be used. However, the adsorbent is preferably flammable so that it can be incinerated, and has a large specific surface area so that odor components can be quickly adsorbed and removed in a wastewater treatment tank, for example, porous solid particles. Alternatively, it is preferably in the form of fine solid particles. Therefore, it is preferable to use porous solid particles or fine powdered activated carbon as the adsorbent. In the case of using activated carbon, it is necessary to add, for example, 0.05% by weight or more to wastewater in order to achieve a deodorization of 50% or more. For example, 0.1% by weight or more is required. The amount of the adsorbent used varies depending on the type of wastewater to be deodorized and the type of adsorbent, and depending on the wastewater, it may be necessary to add the adsorbent in an amount of several percent by weight.

In the present invention, the water in the wastewater is separated by evaporation. By the water evaporation separation, the amount of the residual evaporation of the wastewater can be reduced. A solid such as an adsorbent is separated from the evaporation residue having a reduced amount. The amount of the evaporation residue from which the solids such as the adsorbent have been separated is small,
Since harmful components and odorous components are adsorbed and separated by the adsorbent,
The residue that has been evaporated and dried is incinerated. In the present invention, the water separated by evaporation is 60% by weight or more,
It is preferably at least 80% by weight, more preferably at least 90% by weight. In the present invention, in order to evaporate and separate the water in the wastewater, in the wastewater evaporation treatment tank, the wastewater is dispersed in fine droplets and mixed with air heated to a temperature of 60 ° C. or lower, for example, combustion gas. , And is brought into contact with air heated to a temperature of 60 ° C. or less by waste heat of the combustion gas. As described above, by contact with air heated to a temperature of 60 ° C. or less by the waste heat of the combustion gas, the water content of the waste water is forcibly and quickly evaporated, that is, rapidly evaporated to contain the adsorbent and the adsorbent. It becomes slurry-like washing wastewater in which solid particles are concentrated. The washing wastewater flows into the wastewater treatment tank from the washing wastewater discharge opening at the bottom of the wastewater evaporation treatment tank via the tubular connecting pipe. In the present invention, the flue of the combustion device is passed through the wastewater treatment tank, and the wastewater containing fine solid particles is heated to 60 ° C. by the combustion gas passing through the flue before being dispersed by the wastewater dispersion device. Heated to the following temperature.

In the present invention, the wastewater treated by the wastewater treatment method and apparatus is provided with coarse solid particles present in the wastewater so as not to hinder the spraying, spraying or spraying in the wastewater evaporation treatment tank. It is preferable that they have been removed in advance by, for example, a sieving device such as a screen, a solid-liquid separator such as a sedimentation tank or a centrifuge. In this case, the solid particles contained in the wastewater treated by the wastewater treatment device are the solid particles.
The particle size is smaller than that which can be separated by a liquid separator. Therefore, the solid particles contained in the wastewater treated by the wastewater treatment method and apparatus of the present invention have a particle size equal to or less than the particle size separable by the solid-liquid separator, for example, solid particles having a particle size of 5 mm or less, preferably Solid particles having a particle size of 1 mm or less, more preferably fine solid particles having a particle size of 0.5 mm or less.

The wastewater in the wastewater treatment tank is forcibly dispersed into fine droplets from a wastewater dispersing device in a wastewater evaporation treatment tank as cleaning wastewater. For that purpose, the wastewater in the wastewater treatment tank is sent to the wastewater dispersion device by a liquid sending pump such as a sand pump and a circulation pump. At the lower part of the wastewater treatment tank, there is provided an opening for discharging wastewater for washing, which is connected to a liquid feed pump such as a sand pump or a circulation pump via a pipeline. When the residual amount of waste water evaporation in the waste water treatment tank is reduced, the level of the reduced liquid level is detected, for example, by a liquid level switch of a float method, and the operation of the liquid feed pump is stopped to feed the waste water for cleaning. The liquid supply by the pump is stopped, and the evaporating process in the wastewater evaporating tank is stopped. The wastewater evaporation residue in which the evaporation of the wastewater is stopped has solid particles including the adsorbent concentrated therein and is in the form of sludge, and a sludge discharge device such as a submersible pump, a sand pump or a sludge conveyor is provided from the wastewater treatment tank. Is taken out through. The sludge-like wastewater evaporation residue taken out from the wastewater treatment tank is subjected to dehydration treatment by a dehydration treatment device such as compression filtration or centrifugal filtration, and the obtained filter cake is used as a fertilizer or incinerated. The amount of filtrate generated by dehydration treatment such as compression filtration or centrifugal filtration is small. For example, the filtrate is heated by waste heat and evaporated to dryness.

As described above, according to the present invention, the water in the wastewater is separated as steam and is not discharged to rivers or the like. The filtrate generated by dehydration is almost purified because the harmful substances in the wastewater are adsorbed by the adsorbent, and can be evaporated using waste heat. It is processed. In the present invention, the odor generated by the wastewater is adsorbed and removed by the adsorbent added to the wastewater. Further, in the present invention, activated carbon, zeolite,
Wastewater for circulation as wastewater for cleaning from a wastewater treatment tank containing fine solid particles of an adsorbent such as a polymer adsorbent is sprayed on gas in a wastewater evaporation treatment tank, and steam and combustion evaporate from the wastewater treatment tank The carbon dioxide gas, the combustion slag, the harmful gas, and the like in the combustion gas are brought into contact with the air containing the gas, contacted with the cleaning wastewater, absorbed and adsorbed, and separated.

In the present invention, the wastewater evaporation treatment tank connected to the wastewater treatment tank is formed to function as a wastewater evaporation treatment tank for exhaust gas and / or a dust collection chamber. For this purpose, in the present invention, a shower unit provided with a wastewater dispersion device such as a fountain nozzle, a watering nozzle or a spray nozzle is provided above the air introduction opening to which the air introduction pipe unit is connected, and below the shower unit, A wastewater dispersion adjusting member having pores such as a porous plate or a porous member for further dispersing water droplets formed by spraying or watering is provided. By this wastewater dispersion adjusting member, fine droplets of the cleaning wastewater are further finely dispersed and formed in a thin layer to form a wet wall. The fine droplets and / or thin layers of the cleaning wastewater containing the finely dispersed adsorbent are in direct contact with the combustion gas and air, and the dust contained in the combustion gas and air is The droplets come into contact with the dispersed droplets and also come into contact with the pore surfaces wetted with the cleaning wastewater in the pores of the water droplet adjusting member and are collected. A mist separator is provided above the shower part of the wastewater evaporation treatment tank, so that mist of cleaning wastewater used for cleaning is collected, and the mist escapes to the atmosphere. Not to be.

In the present invention, the air is heated by mixing with the combustion gas passed through the wastewater treatment tank in order to increase the evaporation of the wastewater sprayed for cleaning and evaporation into the wastewater treatment tank. Here, the air flow may be an air flow including dust. In this case, the wastewater evaporation treatment tank functions as a wastewater evaporation treatment tank for the combustion gas, and also as a cleaning and dust collection chamber for removing dust and harmful gas components such as soot in the combustion gas and dust in the air flow. I do. In the present invention,
The adsorbent has a specific surface area that is large enough to be brought into contact with the waste liquid to adsorb odor components, and a particle size that does not easily settle, for example, a particle size of 37 μm (400 mesh) or less,
Preferably, the thickness is 10 μm. The particle size of the adsorbent can be 5 mm or less, like the solid particles in the wastewater. In this case, in order to suspend the adsorbent in the wastewater, it is preferable to provide a stirring device in the wastewater treatment tank so that the wastewater containing the adsorbent can be stirred.
In this way, the adsorbent can be reliably sent into the wastewater evaporation treatment tank without causing the adsorbent to settle in the wastewater treatment tank.

According to the present invention, in the wastewater evaporative treatment tank, the thick slurry wastewater in which the adsorbent and the solid particles are concentrated flows down from the bottom of the wastewater evaporative treatment tank into the wastewater treatment tank through a tubular connecting pipe. . In the wastewater treatment tank, a heated air stream is introduced through a blower pump to discharge water vapor generated in the wastewater treatment tank, and the pressure becomes higher than in the wastewater treatment tank. Therefore, in order to prevent heated air from flowing into the wastewater treatment tank, the end of the tubular connecting member is positioned within the wastewater in the wastewater treatment tank in the wastewater evaporation treatment tank, and the liquid is sealed by the tubular connection member. Have been. In the present invention, the upper opening of the wastewater treatment tank is covered by a bottom member of the wastewater evaporation treatment tank. The temperature of the waste liquid in the wastewater treatment tank is 60 ° C. or less, and the generated steam can be released to the atmosphere. A flue gas pipe such as a flue is formed through the wastewater of a wastewater treatment tank. One or more combustion gas pipes in the wastewater treatment tank can be provided. At the bottom of the wastewater treatment tank, there is provided an outlet for wastewater evaporation residual liquid in the form of slurry by evaporating water in the wastewater evaporation treatment tank to concentrate solid particles.

In the present invention, an upper support frame member having an upper support and a holding frame can be provided for holding the wastewater evaporation treatment tank, and a lower support and a holding frame for holding the wastewater treatment tank are provided. A lower support frame member can be provided. Holding the wastewater evaporation treatment tank on the upper support frame member,
The wastewater treatment tank can be held by the lower support frame member, and the upper support frame member can be fixed to the lower support frame member. However, the wastewater evaporative treatment tank or the upper support frame member holding the wastewater evaporative treatment tank is suspended by a hanging device such as a wire rope, or is supported by a lifting device such as a hydraulic elevator or the like. The upper support frame member can be movably attached to the lower support frame member with or without a guide member. As described above, when the upper support frame member is provided so as to be vertically movable with respect to the lower support frame member, evaporation of the cleaning wastewater is repeatedly performed in the wastewater evaporation tank 2, and the wastewater in the wastewater treatment tank is evaporated. Even if the amount of water is reduced by evaporation, by lowering the upper support frame member with respect to the lower support frame member, the tip of the tubular connection member is always positioned in the wastewater of the wastewater treatment tank, and the inside of the wastewater evaporation treatment tank is Can be maintained by water sealing.

According to the present invention, an adsorbent is mixed with waste water containing fine solid particles, and the waste water mixed with the adsorbent is brought into direct contact with air heated to a temperature of 60 ° C. or lower by a combustion gas, 60% by weight or more of water in the wastewater is evaporated and separated, and the evaporation of the wastewater in which the solid particles are concentrated is dehydrated. Therefore, the wastewater containing organic substances having an odor is
The adsorbent is added, and the odor is eliminated by direct contact with the heated air using the combustion heat of the combustion gas, and a part of the water in the wastewater is evaporated and separated as water vapor. The harmful components in the air heated by the above are separated and removed in the wastewater. The wastewater in which the adsorbent and the solid particles are concentrated in this way is repeatedly evaporated, and becomes a slurry-like wastewater evaporation residue in which the adsorbent and the solid particles are concentrated,
It is taken out of the wastewater treatment tank and dewatered to form a filter cake, which can be used as fertilizer or can be incinerated.Therefore, there is almost no wastewater, and the wastewater is deodorized and the combustion gas is treated. Can be done simultaneously.

According to the present invention, there is provided a wastewater evaporation treatment tank having a side wall provided with an air introduction opening and a bottom plate provided with a wastewater discharge opening, and supported by an upper support frame member. An opening for discharging wastewater containing an adsorbent, an opening for introducing wastewater, and an opening for discharging sediment are provided below the wastewater evaporation treatment tank, and a heating pipe connected to a combustor is penetrated. One end is connected to a wastewater treatment tank which is provided with a wastewater reservoir and is supported by a lower support frame member, and the other end is connected to a wastewater discharge opening of a bottom plate portion of the wastewater evaporation treatment tank, and the other end is a wastewater reservoir of the wastewater treatment tank In the wastewater evaporation treatment tank, a wastewater dispersing device is provided above the position of the air introduction opening, and an outlet side with respect to the wastewater dispersing device. The mist separator is located A water droplet disperser is provided below the dispersing device, and a combustion gas outlet of a heating tube of the wastewater treatment tank is connected to an air introduction opening of the wastewater evaporation treatment tank. The wastewater dispersing device of the wastewater evaporation treatment tank is connected to a pipeline connected to a circulating water extraction opening of the wastewater treatment tank via a liquid feed pump, and the upper support frame member is Since the wastewater is supported by the lower support frame member, the wastewater to which the adsorbent is added is preheated by using the combustion heat of the combustion gas, and the preheated wastewater is mixed with the combustion gas to heat the air. In the stream, dispersed in the form of fine droplets, the solid particles and the adsorbent in the wastewater are concentrated by generating steam while eliminating the odor of the wastewater. Separates moisture in water as water vapor, and also adsorbs And waste water evaporator bottoms which solid particles are concentrated is removed from the waste water treatment tank,
After being dehydrated and separated into a filter cake and a filtrate, the filter cake can be used as it is as a fertilizer or can be incinerated, the filtrate has a small amount, and harmful components are collected in the cake together with the adsorbent. Therefore, the residue is evaporated to dryness by waste heat of flue gas or the like, and the dried and solidified residue is incinerated. According to the present invention, as described above, the detoxification treatment and the treatment of the combustion gas can be simultaneously performed while deodorizing the wastewater.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings, but the present invention is not limited by the following examples and descriptions. FIG. 1 is a schematic explanatory view of a wastewater treatment apparatus according to one embodiment of the present invention.

In the embodiment shown in FIG. 1, a wastewater treatment apparatus 1 includes a wastewater evaporation treatment tank 2 and a wastewater treatment tank 3. The wastewater evaporation tank 2 is supported by an upper support 4, and the wastewater treatment tank 3 is supported by a lower support. In the wastewater evaporation treatment tank 2, a mixed gas introduction pipe 7 of combustion exhaust gas and air is connected to an opening 6 on one side. The mixed gas introduction pipe 7 is connected to a branch pipe section 9 via a blower 8. One pipe of the branch pipe section 9 is an air introduction pipe section 10. In this example, air from the atmosphere is introduced into the air introduction pipe section 10. The other pipe of the branch pipe section 9 is a combustion exhaust gas pipe 11.

A flue gas exhaust pipe 11 such as a flue is connected to a flue gas exhaust port 13 of a combustion device 12 and is subsequently provided through the inside of the wastewater treatment tank 3. The wastewater 14 in the wastewater treatment tank 3 is provided to be heated by the generated heat. In this example, a connection pipe member 16 is connected to the bottom 15 of the wastewater evaporation treatment tank 2, and the lower end 17 of the connection pipe member 16 is located near the bottom 18 of the wastewater treatment tank 3.

In this embodiment, a cleaning wastewater spray device 20 having a plurality of cleaning wastewater spray nozzles 19 is provided above the opening 6 for introducing the mixed gas in the wastewater evaporation treatment tank 2, and below it. A regulator 22 having a plurality of ventilation holes 21 is provided at a position located above the opening 6 for introducing the mixed gas. A mist separator 23 is provided at the upper end of the wastewater evaporation treatment tank 2, and the mist is discharged by the mist separator 23 into the wastewater evaporation treatment tank 2 by the washing wastewater spray device 20. Before being collected. Cleaning wastewater spray device 2
Reference numeral 0 denotes a pipe 26 connected to a cleaning wastewater outlet 24 provided at a position slightly higher than the bottom 18 of the wastewater treatment tank 3 (for example, a position at a height of 80 mm) via a liquid feed pump 25. Connected. In this example, the wastewater treatment tank 3 is provided with a wastewater inlet 27 at an upper part thereof, and a bottom part 1 thereof.
8 is provided with a sediment discharge port (not shown). In this example, the surrounding member 30 surrounds between the wastewater evaporation treatment tank 2 and the wastewater treatment tank 3.

Since the present example is configured as described above,
For example, seed rice disinfecting wastewater containing an ipconazole agent (Teclead (trade name), manufactured by Kumiai Chemical Co., Ltd.) and a fenitrothion agent (Sumithion (trade name, manufactured by Hokuko Chemical Co., Ltd.) as a seed disinfectant is formed at the upper part of the wastewater treatment tank 3. The wastewater is introduced into the wastewater treatment tank 3 from the wastewater inlet 27 that has been used. In this example, the wastewater 14 contains 0.1% by weight of powdered activated carbon.
Was added. The combustion exhaust gas flows from the combustion exhaust gas outlet 13 of the combustion device 12 into the combustion exhaust gas conduit 11, and the slurry-like wastewater 1 containing the solid particles in the wastewater treatment tank 3 is discharged.
4 is heated to a temperature of 60 ° C. or lower, flows into the branch pipe section 9 and mixes with the introduced air to form a mixed gas of air and combustion exhaust gas. The mixed gas of the air and the combustion exhaust gas is introduced into the wastewater evaporation treatment tank 2 from the opening 6 through the mixed gas introduction pipe 7 of the air and the combustion exhaust gas.

The slurry wastewater 14 containing the solid particles heated in the wastewater treatment tank 3 by the combustion exhaust gas is used to remove the washing wastewater provided at the bottom 18 of the wastewater treatment tank 3 by driving a liquid feed pump 25. It is taken out from the port 24, introduced into the washing wastewater spraying device 20 through the conduit 26, and sprayed from the washing wastewater spray nozzle 19. The atomized fine droplets of the sprayed slurry-like cleaning wastewater are uniformly dispersed by the regulator 22. The mist-like fine droplets of the dispersed slurry-like washing wastewater come into contact with the mixed gas of the air and the combustion gas introduced from the mixed gas introduction opening 6 in the wastewater evaporation treatment tank 2, Part of the water content of the slurry-like washing wastewater evaporates to form steam, and flows out of the outlet 28 of the wastewater evaporation treatment tank 2 together with the mixed gas. The mixed gas stream containing water vapor is collected and separated by the mist separator 23 while flowing through the mist separator 23. On the other hand, the drops of the slurry-like washing wastewater from which a portion of the moisture has been evaporated fall to the bottom 15 of the wastewater evaporation treatment tank 2 and flow down from the connecting pipe member 16 into the wastewater treatment tank 3 to further reduce the solid particle concentration. Form high slurry washing wastewater.

During the process of spraying and evaporating the slurry-like washing wastewater, the amount of the washing wastewater in the wastewater treatment tank 3 decreases, and the slurry-like washing wastewater reduces the concentration of solid particles in the wastewater. It becomes denser and eventually forms a sludge-like waste liquid. The liquid level 29 of the washing wastewater in the wastewater treatment tank is detected by a liquid level gauge provided in the wastewater treatment tank, and when the liquid level of the washing wastewater in the wastewater treatment tank falls below a certain level, the liquid sending pump 25 is detected. Is stopped, the sludge-like wastewater evaporation residue in the wastewater treatment tank 3 is taken out by a submersible pump and dehydrated, and the adsorbent and solid particles of the filter cake are incinerated. In this example, the wastewater treatment could be performed in a state where the seed disinfectant and the insecticide odor of the seed rice disinfection wastewater were deodorized.

In this example, powdered activated carbon is used as an adsorbent used for odor control during the evaporation and concentration of wastewater. Regarding the deodorization rate of the powdered activated carbon, when the added amount of the powdered activated carbon was 0.1% by weight, the deodorization rate of the seed disinfecting solution was 1
Although it was 00%, the addition amount of powdered activated carbon was 0.05% by weight.
At that time, the deodorization rate was 50% or less. Further, in this example, the combustion exhaust gas is mixed with air, but may be a gas flow containing dust.

In this example, as a seed disinfectant, an ipconazole agent (Teclead (trade name), manufactured by Kumiai Chemical Co., Ltd.) and a fenitrothion agent (Sumithion (trade name),
Seed disinfection wastewater including Hokusei Chemical Co., Ltd.) is treated, but befurazoate (Hellseed (trade name), manufactured by Hokuko Chemical Co., Ltd.) as a seed disinfectant and 5-ethyl-
Seed disinfection wastewater containing 5,8-dihydro-8-oxo [1,3] dioxolo [4,5-g] quinoline-7-carboxylic acid (oxolinic acid) (Stana (trade name), manufactured by Hachishu Chemical Co., Ltd.) In this case, the same result as that of the present example was obtained. In addition, tetrachloroisophthalonitrile (TP
N) (Daconil (trade name)), oxolinic acid 2
0.0% and prochloraz 5.0% (oxolinic acid / prochloraz agent) (sportac stana (trade name)), 2- (thionanomethylthio) benzothiazole (TCMTB) (ichiban (trade name)) and triflumizole Similar results were obtained using the wastewater treatment method and the wastewater treatment apparatus performed in this example for the seed paddy disinfection wastewater containing (Trifmin (trade name)) as a seed disinfectant. In addition, N-trichloromethylthiotetrahydrophthalimide (captan agent) (orthoside (trade name)) (manufactured by Sankei Chemical Co., Ltd.) as a fungicide and vorthiophos (toction (trade name)) as an insecticide (manufactured by Nippon Bayer and Agrochem) With respect to the lily root disinfection wastewater containing, the same result was obtained by using the wastewater treatment method and the wastewater treatment apparatus performed in this example.

The examples of the treatment of the seed paddy disinfection wastewater and the lily root disinfection wastewater according to the present embodiment have been described above. The present invention is applied to wastewater having odors such as food industry wastewater, livestock industry wastewater, and other agricultural wastewater. However, similar results were obtained.

In this embodiment, when the wastewater is evaporated under blowing, the amount is 1 to 2 ml per 1 m3 of air. In this embodiment, the air flow contacted by the combustion exhaust gas is heated to 6 ml / m3 due to heating. Since the evaporation amount is as large as 12 to 12 ml, the evaporation time of wastewater can be shortened. In this example, the wastewater evaporation residue remaining at the end was taken out of the wastewater treatment tank 3 by a suction pump, dehydrated by a filter press, made into a cake, and incinerated.

In the present embodiment, the wastewater treated by the wastewater treatment apparatus 1 has been subjected to coarse dust removal by a centrifugal separator, but the coarse waste has been removed by a screen or other sieve or by a sedimentation tank. Even when the supernatant is used, the same result as in this example can be obtained. In this example, a filter press is used for the dehydration treatment of the sludge-like wastewater evaporation residue, but a centrifugal dehydrator and a sedimentation filtration device can be used.

In this embodiment, the wastewater evaporating tank 2 is held by an upper column 4 by a holder 31, and the wastewater tank 3 is held by a lower column 5 by a holder 32. In this example, the upper support 4 is fixed to the lower support 5, and the tubular connecting member 16 formed at the bottom 15 of the wastewater evaporative treatment tank 2 in order to maintain the pressure in the wastewater evaporative treatment tank 2,
In order to maintain the pressure in the wastewater evaporation treatment tank 2 by liquid sealing, the tip is formed long so as to be located near the bottom 18 of the wastewater treatment tank 3. However, the wastewater evaporative treatment tank 2 or the upper support 4 holding the wastewater evaporative treatment tank 2 is hung by a hanging tool such as a wire rope or supported by a lifting device such as a hydraulic elevator. 2 or the upper support 4 with or without a guide member,
It can be movably attached to the lower support 5. In this case, even though the washing wastewater is repeatedly evaporated in the wastewater evaporation treatment tank 2 and the amount of wastewater in the wastewater treatment tank is reduced by evaporation of water, the upper support 4 is connected to the lower support 5.
, The distal end of the tubular connecting member 16 can be always positioned in the wastewater of the wastewater treatment tank 3, and the pressure in the wastewater evaporation treatment tank 2 can be maintained by water sealing.
The length of the tubular connecting member formed at the bottom 15 of the wastewater evaporation treatment tank 2 can be shorter than that of the tubular connecting member 16 shown in FIG.

[0031]

According to the present invention, waste water containing fine solid particles is mixed with an adsorbent, and the waste water mixed with the adsorbent is heated to a temperature of 60 ° C. or less by combustion gas. Is dispersed in the form of droplets in air heated to a temperature of 60 ° C. or less by the combustion gas, and the water content of the wastewater is reduced to 60%.
By evaporating more than weight percent, the solid particles in the wastewater are concentrated,
The wastewater evaporation residue in which the solid particles are concentrated is subjected to dehydration treatment, and the solid particles in the residue are separated from the wastewater evaporation residue as a cake. Treatment can be carried out and the amount of wastewater discharged can be significantly reduced.

The present invention provides a wastewater evaporative treatment tank having a side wall provided with an air introduction opening, and a bottom plate provided with a washwater discharge opening, and a lower part of the wastewater evaporative treatment tank. An opening for removing circulating water containing an adsorbent, an opening for introducing wastewater and an opening for removing sediment are provided, and a wastewater reservoir through which a heating pipe connected to the combustor is provided is provided. A wastewater treatment tank, and a tubular connecting member having one end connected to the washing water discharge opening of the bottom plate of the wastewater evaporation treatment tank and the other end located in the wastewater storage section of the wastewater treatment tank. In the evaporation tank, a wastewater dispersing device is provided above the position of the air introduction opening, and a mist separator is provided on the outlet side of the wastewater dispersing device. The wastewater dispersion device in the evaporative treatment tank is Since it is connected to the conduit connected through a liquid feeding pump to the opening, and can be downsized compared with the conventional waste water treatment apparatus it does not require a large location, excellent economically.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a wastewater treatment apparatus according to one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wastewater treatment device 2 wastewater evaporation treatment tank 3 wastewater treatment tank 4 upper support 5 lower support 6 opening 7 mixed gas introduction pipe 8 blower 9 branch pipe section 10 air introduction pipe section 11 combustion exhaust gas pipe 12 combustion device 13 combustion gas Discharge port 14, waste water 15 bottom of waste water evaporation treatment tank 2 16 connection pipe member 17 lower end of connection pipe member 16 18 bottom of waste water treatment tank 3 19 cleaning waste water spray nozzle 20 cleaning waste water spray device 21 vent hole 22 regulator 23 Mist separator 24 Cleaning wastewater outlet 25 Liquid feed pump 26 Pipeline 27 Wastewater inlet 28 Wastewater evaporation treatment tank 2 outlet 29 Liquid level of wastewater treatment tank 3 30 Enclosure member 31, 32 Holder

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2B101 AA01 CB06 4D024 AA10 AB04 BA02 BA07 BA17 BB01 BC04 DB01 DB06 4D034 AA17 AA26 BA01 CA01 CA19 CA21

Claims (6)

[Claims] 1. An adsorbent is mixed with wastewater, and the wastewater mixed with the adsorbent is brought into direct contact with air heated to a temperature of 60 ° C. or lower to evaporate and separate 60% by weight or more of water in the wastewater. And a dewatering treatment of the evaporation residue. 2. An adsorbent is mixed with waste water containing solid particles,
The wastewater mixed with the adsorbent is heated to 60 ° C. by the combustion gas.
The wastewater is heated to the following temperature, and the heated wastewater is dispersed in the form of droplets in air heated to a temperature of 60 ° C or less by the combustion gas to evaporate at least 60% by weight of water in the wastewater. A dewatering treatment of the evaporation residue in which the solid particles are concentrated, and separating the solid particles in the wastewater as a cake from the evaporation residue. 3. The wastewater treatment method according to claim 1, wherein the wastewater is food industry wastewater, livestock industry wastewater, or agricultural wastewater from which coarse solid particles have been separated. 4. A wastewater evaporative treatment tank having a side wall part provided with an air introduction opening and a bottom plate part provided with a wastewater discharge opening, and an adsorbent is provided below the wastewater evaporative treatment tank. A wastewater treatment tank provided with a circulating water removal opening, a wastewater introduction opening and a sediment removal opening, and a wastewater reservoir through which a heating pipe connected to a combustor is penetrated. And a tubular connection member having one end connected to the opening for washing wastewater discharge of the bottom plate portion of the wastewater evaporation treatment tank and the other end located in the wastewater storage section of the wastewater treatment tank,
In the wastewater evaporation treatment tank, a wastewater dispersion device is provided above the position of the air introduction opening, and a mist separator is provided at an outlet side with respect to the wastewater dispersion device, The wastewater treatment device is characterized in that the wastewater dispersion device of the wastewater evaporation treatment tank is connected to a pipe connected to a circulating water extracting opening of the wastewater treatment tank via a liquid feed pump. 5. A wastewater evaporation treatment tank which has a side wall provided with an air introduction opening, and a bottom plate provided with a wastewater discharge opening, and is supported by an upper support frame member. An opening for discharging wastewater containing an adsorbent, an opening for introducing wastewater, and an opening for discharging sediment are provided below the wastewater evaporation tank, and a wastewater reservoir through which a heating pipe connected to a combustor is penetrated. Part is provided, the wastewater treatment tank supported by the lower support frame member, and one end is connected to the wastewater discharge opening of the bottom plate part of the wastewater evaporation treatment tank, and the other end is located in the wastewater storage part of the wastewater treatment tank. A tubular connecting member,
In the wastewater evaporation treatment tank, a wastewater dispersion device is provided above the position of the air introduction opening, and a mist separator is provided at an outlet side with respect to the wastewater dispersion device, A water droplet disperser is provided below the wastewater dispersion device, and a combustion gas outlet of a heating pipe of the wastewater treatment tank is connected to an air introduction opening of the wastewater evaporation treatment tank. Connected to a pipe, the wastewater dispersing device of the wastewater evaporation treatment tank is connected to a pipe line connected to a circulating water extraction opening of the wastewater treatment tank via a liquid feed pump,
The said upper support frame member is supported by the said lower support frame member, The wastewater treatment apparatus characterized by the above-mentioned. 6. The wastewater treatment apparatus according to claim 4, wherein the wastewater is food industry wastewater, livestock industry wastewater or agricultural wastewater from which coarse solid particles are separated.