JPH0676A - Vertical low-temperature vacuum evaporation drier for treatment of distillation waste liquid of pot stilled low-class spirits - Google Patents

Abstract

PURPOSE:To obtain a solid material having excellent preservability and distributability by evaporating a distillation waste liquid of SHOCHU(low-class distilled spirits) at a low temperature under specific condition. CONSTITUTION:Distillation waste liquid of pot-stilled SHOCHU having a water- content of 91-94% is charged into a vertical vacuum evaporation drier 1 through a waste liquid charging port 21 and the drier pot is evacuated to -650mmHg with a water-seal vacuum pump 9. Hot water of >=65 deg.C is pumped from a hot- water tank 5 to a jacket to keep the temperature in the drier pot to 55-50 deg.C and the waste liquid is evaporated for 15-18hr under stirring with a stirrer 12. The distillation waste liquid is dried to a solid material having a water- content of <=10% and the evaporated steam is treated with a condenser 7 and a separator 8 provided with an overflow chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in the field of wastewater treatment as a middle-stage pretreatment device for the treatment of shochu distilled wastewater, starch wastewater, beer, whiskey wastewater, and tofu manufacturing wastewater. It is also used in the field of resource reuse such as feed and fertilization.

[0002]

2. Description of the Related Art In contrast to (claim 1), the hot air dryer of the prior art is a shochu distillation waste liquid having a water content of 94% and a water content of 10%.
Since it is a device that mixes the following beer lees, soy sauce lees, and bran, and put them in a dryer, then they are brought into contact with high-temperature gas near 500 ° C and instantly dried while being fluidized by a rotary stirring blade. , The shochu waste liquid was burnt and ended in failure. In addition, the conventional technology of drying the shochu distilled waste liquid with a vertical centrifugal thin film dryer is to put the distilled waste liquid into the can through the inlet nozzle, and the centrifugal force of the rotating blade creates a thin film on the inner surface of the can, which is the heat transfer surface. As a result, a concentrated liquid with a water content of 72% is formed while being heated by the steam outside the can and evaporating. Then add fusuma, dried starch residue, bran, etc. and put it in silage.
This is a method of fermenting for about 30 days to produce roughage, which has a water content of 7
The high labor cost of 2% resulted in failure due to the lack of access to the stock raising industry.

The conventional technique for (claim 2) is mostly a horizontal vacuum evaporator, and (a) in the case of a system in which the main body of the horizontal machine rotates, the shochu waste liquid dries to reach a water content of 10% and powder. However, since the powder protection device such as a bag filter and demister cannot be installed in the evaporative vapor discharge pipe provided inside the machine body because there is no space, the powder is clogged in the evaporative vapor discharge pipe and the vaporized vapor is blocked. The exhaust pipe or vacuum pump is blocked.
Therefore, the degree of decompression does not increase, the boiling temperature in the can becomes 80 ° C or higher, and "burning" of the shochu distilled liquid waste can be performed. (B) In the case where the horizontal stirring machine is fixed and the stirrer inside rotates, two bearings for the stirrer are required on the left and right, and it rotates while receiving the gravity of the stirrer working on the lower surface, causing uneven wear, It is impossible to achieve a high degree of vacuum because the density is impaired, and it is therefore impossible to perform low temperature drying at 50 ° C. or lower.

[0004]

In the prior art using the hot air drying method, it is necessary to "burn" the shochu distillery waste liquid to treat the waste, and it can be dried and stored with a water content of 10% or less without burning, and distributed. There has been a demand for an invention capable of producing a solid product of shochu lees having good properties.

Since the water content of the shochu distilled liquid waste concentrate concentrated by the centrifugal thin film drying method and the dehydrated cake solid-liquid separated by a dehydrator such as a filter press medecant have a water content of up to 75%, they are transported to a ranch to remove fusuma and dried starch residue.・ 30 to 4 including bran
Fermented for 0 days for roughage or mixed with cow dung, chicken dung, etc.
It requires composting, fermenting for 14 to 20 days, and organic fertilizer, silage and composting facilities are required, and facility construction costs are high. The invention of a technology that enables organic fertilizer has been desired. Furthermore, in the case of a filter press decanter, it is a rich organic substance that appears at the same time.
There was a big problem in treating the liquid, and the solution was a problem.

In the case of a horizontal vacuum evaporator, the distance to the inlet of the evaporative vapor discharge pipe is short even if the shochu distillation waste liquid is solidified due to its structure and accumulates at the bottom of the circular can body.
Taking a vacuum evaporator for g treatment as an example, the distance from the layer surface of the dry solids to the evaporative vapor discharge pipe is 600 m / m, and there is no room to install a bag filter / demister to protect the vaporized vapor exhaust pipe. -60 using shochu distillery waste liquid
Even if the pressure is reduced to 0 mmHg and boiling evaporation is performed at 50 ° C. or less without burning, the powder is sucked when the water content of the solid content is around 20%, and the evaporative vapor discharge pipe is closed to prevent vacuuming. Become. Also, in the case of a horizontal vacuum evaporation can, if the agitating device is not installed inside and the can body rotation method is adopted, the vapor evaporation and discharge pipe connected to the water-sealed vacuum pump attached to the core of the can body will have structural fluctuations. It is easy to wake up and loses her tightness.
Further, if the can main body fixing system is provided with an internal agitator, the lower surfaces of the left and right bearings are liable to be lost due to gravity and the airtightness is impaired. Therefore, a fundamental improvement by the invention has been desired.

[0007]

In order to solve the above problems, in the present invention, a dehydrator such as a hot air dryer, a centrifugal thin film dryer, a filter press, a decanter, a belt press, or the like, causes clogging immediately. As shown in Fig. 1, without using a precision filter such as a ceramic filter or membrane.
By using a vertical vacuum evaporation can to reduce the degree of vacuum to -650 mmHg and evaporate it by boiling at an internal temperature of 50 ° C or less, the shochu distilled waste liquid is evaporated without burning, and the solid content of water content is 10% or more. did. The evaporated component was reduced to a liquid by a condenser / separator to give colorless and transparent condensed water. Can temperature is 50 ~
The temperature of hot water in the jacket is 60 ~
Since it suffices to use 65 ° C, a large amount of warm waste water discharged from the distillation kettle cooler of the shochu factory is heated to 60-65 ° C by adding the residual heat of the existing boiler and then sent to the jacket, which makes it an economical and practical device for utilizing waste heat.

Since the conventional decompression / vacuum dryer is a horizontal type, (a) the gravity of the lower surface acts on the bearing portion, causing a loss of weight and impairing the airtightness. (B) The vertical vacuum evaporation drying can was used to solve the problem that the distance between the evaporation outlet and the powdered solids was short and there was no room to install a bag filter. Airtightness is easy to leak The outer shaft seal of the can is located in one place on the top, leaks hardly occur, the degree of pressure reduction is easy to increase, and the manufacturing is easy. Since the upper half of the vertical vacuum evaporative drying can has a space inside it, demisters are installed alternately as shown in Fig. 2 so that the evaporative vapor discharge pipe is not blocked by the scattering of powder, and a bag filter is also installed to add powder. Completely prevent body blockage,
The problem was solved by succeeding in setting the degree of pressure reduction to -650 mmHg.

[0009]

The SS treatment of shochu distillery waste liquid is indispensable as a pretreatment of the waste liquid for water treatment. The reason for this is, for example, in the case of barley shochu distillation waste liquid, BOD 80,000 mg / lS
S40,000 mg / l Organic matter 110,000 mg /
Since it is a concentrated waste liquid of 1 or more, if the SS is not removed to some extent even if the treatment is planned by methane fermentation / yeast treatment, it takes a long time to decompose the substrate, which makes the facility very large and economical. Although there is a problem that it becomes worse and it is not put to practical use, the present invention utilizes the fact that boiling evaporation can be performed at a low temperature by reducing the pressure, and it becomes possible at a reduced pressure degree of -650 mmHg.
The basic technology is to completely evaporate SS by boiling and evaporating the shochu distillation waste liquid at the following temperatures to form a solid content with a water content of 10% or less.

Due to this action, the temperature inside the can is 50 ° C., and the temperature of the hot water inside the outer can jacket is 60 to 65 ° C.
Using the waste heat of the shochu factory as a heat source, it can be operated sufficiently.

[0011]

[Effects of the Invention] Almost all the B-type shochu distillation waste liquid that currently discharges 500,000 m ³ per year only in the Kyushu area is dumped in the ocean,
Prior to the cancellation of ocean dumping at the end of 1995, there is an urgent need to establish technology for distilling wastewater treatment on land, but BOD80,00
0 mg / l SS 40,000 mg / l Organic matter 11
The treatment technology is difficult to establish due to the high-concentration waste liquid of up to 10,000 mg / l, and the high-concentration SS has been a bottleneck in establishing the treatment technology. According to the present invention, SS has a solid content with a water content of 10% or less, SS of the evaporated water is almost zero, BOD is 4,000 mg / l or less, and the amount is 60% or less of the waste liquid stock solution. Therefore, the problem of land treatment technology establishment will be solved all at once and its effect will be great.

Further, according to the present invention, the amount of waste liquid discharged per day is 0.
At a small-scale shochu factory of 5-10 m ³ or less, it is possible to treat concentrated shochu waste liquid simply by installing a commercial septic tank on this equipment. The small-scale Otsuna shochu factories with a shochu distilled effluent discharge amount of 0.5 to 10 m ³ or less extend to 300 or more of the Otsuna shochu factories, which are 370 factories nationwide, and the effect of the device of the present invention is We think that it is possible to solve the problems of waste liquid treatment all at once. It can also be used in tofu factories, beer factories, miso and soy sauce factories, and I think the effect of the invention is great.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a vertical decompression / low humidity evaporation drying apparatus.

[Explanation of symbols]

 1 Vertical vacuum evaporative drying can 2 Cooler 3 Distillation temperature drainage tank 4 Existing boiler 5 Hot water storage tank 6 Disinfection compressor 7 Condenser 8 Separator with overflow chamber 9 Water-sealed vacuum pump 10 Degassing / deodorizing tower 11 Bag filter inspection port 12 Deceleration stirrer with mechanical seal 13 Vent solenoid valve 14 Line pump for cold water 15 Line pump for hot drain tank 16 Line pump for hot water 17 Cold / hot water supply pipe 18 Cold / hot water discharge pipe 19 Safety valve 20 Lower outlet 21 Waste liquid inlet 22 Hot drain Supply pipe 23 Steam supply pipe 24 Well water 25 Compressor air supply pipe 26 Evaporative vapor discharge pipe 27 Condenser discharge pipe 28 Separator discharge pipe 29 Water-sealed vacuum pump discharge pipe 30 Drain pipe

[Fig. 2] 1 vertical vacuum evaporating and drying can 2 vertical vacuum evaporating can inner 3 external vertical vacuum evaporating can 4 can 5 jacket 5 bag filter inspection port 6 bag filter 7 speed reducer with mechanical seal 8 demister 9 stirring blade with demister 10 Lower Teflon bearing 11 Lower scraping stirring blade 12 Evaporative vapor discharge pipe 13 Compressor air supply pipe 14 Waste liquid input port 15 Cold / hot water discharge pipe 16 Cold / hot water supply pipe 17 Lower discharge port 18 Safety valve 19 Ventilation on-off valve 20 Heat retention and racking 21 blade

Claims (2)

[Claims] 1. A Boiled Shochu distilled effluent having a water content of 91 to 94%, which is charged from the waste liquid charging port of FIG.
The apparatus is intended for drying to a solid content of 0% or less, and is mainly composed of the vertical vacuum evaporative drying can of FIG. 1 (1). Using the water-sealed vacuum pump shown in FIG. 1 (9), the pressure inside the can was reduced to -650 mmHg,
When hot water having a temperature of 65 ° C or higher made by the existing boiler of (4) and the hot water storage tank of (5) is sent to the jacket of the vertical vacuum evaporation drying can of (1) by the hot water line pump of (16), The temperature in the can of the vertical vacuum evaporation drying can of 1) is 55-
Keep at 50 ° C. When the decompression degree in the can is −650 mmHg, the shochu distillation waste liquid causes boiling evaporation at around 50 ° C., and the water content of the waste liquid starts to evaporate. When evaporation is continued for 15 to 18 hours at a low temperature of 55 ° C. or lower while continuing to stir with the mechanical stirrer with mechanical seal of (12), the evaporation waste liquid having a water content of 91 to 94% is a solid having a water content of 10% or less. It will be a minute. On the other hand, the vaporized vapor passes through the vaporized vapor exhaust pipe of (26) connected to the upper part of the bag filter inspection port of (11), then the condenser of (7), the agglomerator exhaust pipe of (27), and (8). ) Is introduced to the separator with the overflow chamber. The temperature of the steam drops to 40 ° C and is separated into water and water by the separator with an overflow chamber in (8). For gas, the separator discharge pipe in (28), the water seal vacuum pump in (9), and the water seal in (29). Type vacuum pump exhaust pipe, (1
It is released into the atmosphere from the deaeration and deodorization tower of 0). The colorless and transparent condensed water separated by the separator with an overflow chamber in (8) is discharged through the condensed water discharge pipe in (31) after diluting or simple water treatment. In this way, the shochu distillation waste liquid having a water content of 91 to 94% is evaporated at a low temperature for 15 to 18 hours to form a solid having a water content of 10% or less. 2. In the case of shochu distillery waste liquid, the water content of distilling waste liquid of potato shochu made from potato, which is a vegetable, and rice shochu / barley shochu made from rice that has been refined to 65% / rice brewed / wheat is reduced. When it is less than 10%, it is gradually pulverized to 1 cubic cm.
It becomes as light as 0.35 g per ^{3 and is} sucked when vacuum is drawn, and the evaporation vapor discharge pipe connected to the vacuum pump is closed to prevent pressure reduction and stop the function. In the present invention, first, the evaporation can main body is a vertical vacuum evaporation drying can as shown in FIG. 2 (1), and the evaporation vapor discharge pipe of FIG. 2 (12) is further connected.
The bag filter inspection port of (5) is attached with the bag filter of (6) that can be removed and cleaned, and has a structure for preventing the powder from being mixed into the evaporative vapor discharge pipe (12). Further, the depth dimension of the can in the vertical vacuum evaporation can of (2) is more than twice the depth dimension when the input distillation waste liquid is charged into the can, and the water content is 1
When the powder solid content is 0%, there is a space such that the depth of the powder solid at the bottom of the can is 1/5 or less of the depth of the inner can. Demister, (9)
The stirring blades with a demister of No. 3 are alternately attached, and most of the scattered powder is captured by the demister before the powder reaches the bag filter of (6). Therefore, there is no blockage of the vacuum pump circuit due to scattered powder, -650 mm
It is easy to maintain a reduced pressure of Hg or higher. Furthermore, FIG.
Since the vertical vacuum evaporation and drying can of (1) is vertically installed with the speed reducer with mechanical seal of (7) and the lower Teflon bearing of (10) is also provided in the bottom of the can, Like a horizontal vacuum dryer, it has a structure that does not cause airtight leak due to unevenness due to gravity on the bottom surface of the bearing device due to the weight of agitating blades and shafts.
A device that is easy to maintain a decompression degree of g or more.