KR20120090286A - Apparatus for regulating total solid concentration of food waste - Google Patents

Abstract

PURPOSE: An apparatus for adjusting the solid material concentration of food waste is provided to prevent the clogging phenomenon of a filtering part and to reduce the pulverizing load of a pulverizing part. CONSTITUTION: An apparatus for adjusting the solid material concentration of food waste includes a mixing part(10), a pulverizing part(20), a filtering part(30), a storing part(50), a measuring part(52), and a stirring part(60). Food waste and food waste effluent are introduced into the mixing part to be mixed. The pulverizing part is installed at the lower part of the mixing part. The filtering part is installed at the sidewall of the mixing part. The filtering part filters the pulverized food waste and discharges the filtered food waste. The storing part is installed around the sidewall of the mixing part and stores the discharged food waste. The stirring part is installed at the storing part and stirs the stored food waste and feed water. The measuring part is installed at the storing part and measures the solid material concentration of the stirred food waste. According to the measured solid material concentration of the food waste, the introducing amount of food waste and food waste effluent is controlled.

Description

Apparatus for regulating total solid concentration of food waste}

The present invention relates to a solid waste concentration control device for food waste, and more particularly, to a solid waste concentration control device for maintaining anaerobic digestion treatment by maintaining a constant solid concentration during the treatment of food waste.

In general, organic waste contains concentrated sludge, livestock manure, manure, food waste, drinking water, food waste, and the like as organic constituents.

Conventional organic wastes are generated in the form of solids or slurries with a water content of 78 to 96%, and organic matters in the sludge solids other than water are usually contained in various ranges of 50 to 95%, thereby extinguishing for energy recovery. Treatment efficiency is usually around 50%.

As of 2008, 398,303 tons / day of organic wastes are generated in Korea, most of them are recycled, and the remaining wastes are disposed of through ocean dumping, incineration and landfill, causing environmental and social problems. By 2011, the government has banned marine dumping of organic wastes, aiming to increase the recycling rate of organic wastes on land by 80%.

General recycling methods of organic waste include feed, composting, liquefaction, anaerobic digestion, aerobic digestion, etc. The double anaerobic digestion method is installed for the purpose of reducing sludge in sewage treatment plants. Food waste, drinking water, etc. are mostly aerobic oxidation and ocean dumping methods.

In particular, food waste treatment methods include feed, compost, and liquid fertilization, and the domestic application of the method of directly anaerobic digestion by sorting, crushing and crushing food without using such a method is not so long. It is true.

Anaerobic digestion of food waste during organic waste treatment mainly adopts a method of anaerobic digestion by mixing crushed food and negative waste water by placing a pulverizer in the pipe during the transfer of sorted and shredded food waste to the pump. .

However, since the characteristics of food waste are changed differently according to season, region, and day of the week in Korea, the concentration of solid food waste is changed accordingly, which affects the digestibility of microorganisms according to the change of solid food waste concentration. There is a problem that the anaerobic digestion efficiency of the waste is reduced.

The present invention has been made to solve the above-mentioned conventional problems, to maintain a constant concentration of solids of food waste supplied to the food anaerobic digestion tank to prevent the concentration of solids fluctuate according to season, day, date, region. Improves the efficiency of anaerobic digestion of food, reduces food waste accumulated in the mixing section, reduces the crushing load of the pulverization section, prevents blockage of the filtering section, and solids concentration of food waste that can easily detect the concentration of solids. It is an object to provide an adjusting device.

The present invention for achieving the above object, Food waste and food waste decanting solution flows into the mixing unit; A crushing unit installed under the mixing unit to crush the mixed food waste; A filtering unit installed on the side wall of the mixing unit and filtering the crushed food waste to be discharged to the outside of the mixing unit; A storage unit installed around the side wall of the mixing unit to store the discharged food waste; A stirring unit installed in the storage unit to stir the stored food waste and water supply; And a measuring unit installed in the storage unit to measure the solid concentration of the stirred food waste, wherein the mixing unit determines the inflow amount of the food waste and the food desorption liquid according to the solid concentration of the food waste measured by the measuring unit. It is characterized by controlling the solid concentration of food waste by controlling.

The filtering unit of the present invention includes a first perforated network formed on the lower sidewall of the mixing unit, and a second perforated network formed on the upper sidewall of the mixing unit and having a perforation hole having a larger size than the first perforated network.

Inside the first perforated network of the present invention is provided with a rotary scraper to prevent clogging of the perforated hole of the first perforated network.

The said measuring part of this invention measures the resistance value of a torque meter, and calculates the solid waste concentration of food waste based on the said resistance value.

As described above, according to the present invention, by adjusting the amount of food waste and food desorption liquid introduced into the mixing unit according to the concentration of the solids measured by the measuring unit of the storage unit, the concentration of the solids is kept constant, which is supplied to the food anaerobic digestion tank. It maintains the solid concentration of food waste to prevent the concentration of solids from changing according to season, day of the week, date and region, thereby improving the efficiency of food anaerobic digestion.

By forming a perforated network having perforated holes having different sizes of perforated holes in the filtering part provided on the side wall of the mixing part, it is possible to reduce food waste accumulated in the mixing part to reduce the crushing load of the pulverizing part.

It is possible to prevent the clogging of the filtering unit by installing a rotary scraper inside the filtering unit.

By calculating the concentration of the solid by the correlation equation based on the resistance of the torque meter measured by the measuring unit, the effect of being able to easily detect the concentration of the solid is provided.

1 is a block diagram showing a solids concentration control device of food waste according to an embodiment of the present invention.
2 is an enlarged view of a portion “A” of FIG. 1.
Figure 3 is a block diagram showing a solid concentration control device of food waste according to an embodiment of the present invention.
Figure 4 is a graph showing the correlation between the solids concentration and the torque meter in the solids concentration control device of food waste according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a block diagram showing a solid waste concentration control device of the food waste according to an embodiment of the present invention, Figure 2 is an enlarged view of the "A" of Figure 1, Figure 3 is an embodiment of the present invention Figure 4 is a block diagram showing a solid waste concentration control device of the food waste, Figure 4 is a graph showing the correlation between the solid concentration and the torque meter in the solid waste concentration control apparatus according to an embodiment of the present invention.

As shown in Figure 1, the solid waste concentration control device of the food waste of the present embodiment is a mixing unit 10, crushing unit 20, filtering unit 30, storage unit 50, measuring unit 52, stirring unit It consists of (60) to adjust the solids concentration of food wastes to discharge the food wastes to the food anaerobic digestion tank to be anaerobic digestion treatment.

The mixing part 10 is a mixing drum in which food waste flows in from the bottom and food desorbing fluid flows in from the top and is mixed with each other. 14, the food waste inlet valve 15, the emergency discharge valve (16).

The mixing tank 11 is formed as a cylindrical drum, and food waste and food desorption fluid flow in and are mixed with each other, and a plurality of discharge holes 12 are formed at equal intervals around the top of the side of the mixing tank 11. In the case of food waste and food desorption fluid overflow from the).

The inlet valve 13 of the food stripping liquid is formed at the upper end of the mixing tank 11, so that the inflow amount of the food stripping liquid supplied to the mixing tank 11 from the external food stripping liquid storage tank can be adjusted. The intake valve 13 of the food leaving solution is controlled by the control unit 70 installed separately from the outside to control the inflow amount of the food leaving solution.

The water level detector 14 penetrates the inside of the mixing tank 11 to detect the water level inside the mixing tank 11, and it is preferable to use an ultrasonic level sensor as the water level detector 14.

Food waste input valve 15 is formed at the bottom of the mixing tank 11, it is possible to adjust the inflow amount of the food waste to be supplied to the mixing tank 11, the primarily ground crushed food. The food waste inlet valve 15 is controlled to open and close the amount of food waste is controlled by the control unit 70 is provided separately from the outside to adjust the inflow of food waste.

Emergency discharge valve 16 is formed at the bottom of the mixing tank 11, the connection passage is blocked or opened in an emergency, such as an abnormality of equipment to discharge the mixture of food waste and food desorption liquid to the outside.

Therefore, the mixing unit 10 may control the inflow amount of the food waste and the food leaving solution according to the solid concentration of the food waste measured by the measuring unit 52 to adjust the solid concentration of the food waste.

The crushing unit 20 is a crushing means for crushing the food waste mixed in the mixing unit 11 of the mixing unit 11 of the mixing unit 10, consisting of a blade 21, the motor 22 have.

The blade 21 is rotatably installed in the lower portion of the mixing tank 11 of the mixing section 10 to rotate the particles of food waste to a predetermined size by rotation, the blade 21 is a motor 22 Directly connected, the blade 21 is rotated by the driving force of the motor 22. The pulverization unit 20 is controlled by the control unit 70 is provided separately to the rotational speed of the motor 22 to adjust the size of the crushed particles of food waste.

The filtering unit 30 is installed on the side wall of the mixing unit 10 to filter the food waste crushed by the crushing unit 20 to be discharged to the outside of the mixing unit 10, the first perforated network 31 and the first It consists of two perforated networks (32).

The first perforated network 31 has a plurality of perforated holes are formed in the lower side wall of the mixing section 10 to filter the food waste to be discharged to the outside of the mixing section 10, the first perforated network 31 in the 1 It is preferable that the rotary scraper 40 is provided so that the perforation hole of the perforation network 31 may be prevented.

The scraper 40 is made rotatable to prevent food waste from being blocked in the perforation hole of the first perforation network 31, and consists of a motor 41, a rotation shaft 42, and a blade 43.

The motor 41 is installed on the upper portion of the mixing section 10, and provides a rotational driving force to the blade 43 through the rotating shaft 42, the brush is installed on the side end of the blade 43 of the blade 43 When the rotation is in contact with the perforated hole of the first perforated network 31 to prevent the perforated hole is blocked by the food waste attached thereto.

The second perforation network 32 has a plurality of perforation holes are formed on the upper sidewall of the mixing section 10, a perforation hole having a larger size than the perforation holes of the first perforation network 31 is formed through the first perforation network 31 Food waste not discharged to the outside will be discharged to the outside.

As shown in FIG. 2, the perforated hole of the first perforated network 31 has a diameter d1 of 10 mm, and the perforated hole of the second perforated network 32 has a diameter d2 of 15 mm. It is preferable to prevent the food waste having a size larger than 10 mm from being accumulated in the mixing section 10 so that an excessive load is applied to the pulverizing section 20.

The storage unit 50 is a sealed storage means installed around the side wall of the mixing unit 10, and stores the food waste discharged through the filtering unit 30 in the mixing unit 10, the storage tank 51, the water level detector ( 53), the feed water valve 54, the adjustment product discharge valve 55, and the drain valve 56.

The storage tank 51 is a sealed storage tank installed around the side wall of the mixing unit 10 and communicates through the mixing unit 10 and the filtering unit 30 to store the food waste discharged from the mixing unit 10.

The water level detector 53 is installed through the inside of the upper end of the reservoir 51 to detect the water level inside the reservoir 51, and it is preferable to use an ultrasonic level sensor as the water level detector 53.

The water supply valve 54 is installed at the upper end of the storage tank 51, so that the time water stored in the external storage tank can adjust the amount of water supplied into the storage tank 51. The adjuster discharge valve 55 is installed at the lower side of the side wall of the reservoir 51 to adjust the discharge amount of the adjuster for adjusting the level of food waste stored in the reservoir 51 is discharged to the outside. The drain valve 56 is installed at the lower side of the side wall of the reservoir 51 to discharge the food waste stored in the reservoir 51 to the outside.

The measuring unit 52 is installed through the storage tank 51 upper end of the storage unit 50 to measure the solids concentration of the food waste stored in the storage tank 51. As the measuring unit 52, it is preferable to use a torque meter as a solids measuring sensor for measuring the rotational resistance value of food waste using a blade.

Four months from August 2010 to November 2010 to determine the correlation between the resistance value of the torque meter and the solids concentration so that the solids concentration can be calculated by the resistance value of the torque meter measured by the measuring unit 52. In the meantime, the results of measuring the resistance value of the torque meter and the concentration of the solid in the solid concentration control device of the present embodiment are shown in Table 1 in detail.

date
Solid Concentration (%) Resistance value of torque meter (Hz) Hz × 10 Hz 2010.08.11 10.05 0.67 6.70 2010.08.23 8.02 0.56 5.60 2010.08.30 8.19 0.56 5.60 2010.09.08 7.93 0.55 5.50 2010.09.10 8.29 0.57 5.70 2010.09.13 8.15 0.55 5.50 2010.09.15 8.38 0.58 5.80 2010.09.27 9.96 0.67 6.70 2010.10.07 10.50 0.69 6.90 2010.10.12 9.43 0.62 6.20 2010.10.19 10.29 0.67 6.70 2010.10.21 10.23 0.67 6.70 2010.10.28 10.49 0.69 6.90 2010.11.02 9.51 0.63 6.30 2010.11.04 9.19 0.63 6.30 2010.11.09 8.53 0.60 6.00

As described above, the measured resistance value of the torque meter and the concentration of the solids are shown in a graph as shown in FIG. 4 and the correlations thereof are converged. As a result, the correlation as shown in Equation 1 below can be inferred.

However, x is the concentration (%) of solids, and y is the resistance value (x10 Hz) of a torque meter.

Therefore, the measuring unit 52 can measure the resistance value of the torque meter and calculate the solid waste concentration of the food waste based on the resistance value and the above equation (1).

The stirring unit 60 is installed through the upper end of the storage tank 51 of the storage unit 50 to agitate the food waste stored in the storage tank 51 and the water supplied to the storage tank 51, and the motor 61. ), A rotating shaft 62, and a blade 63.

The motor 61 is installed on the upper portion of the storage unit 50, and provides a rotational driving force to the blade 63 through the rotation shaft 62, a plurality of blades 63 are installed on the rotation shaft 62, the blade ( The food waste stored in the storage tank 51 and the water supply supplied to the storage tank 51 are stirred by the rotation of 63.

Hereinafter, with reference to Figure 3 will be described in detail the operation of the solid waste concentration control device of the food waste of the present embodiment.

Firstly, the ground food waste is introduced into the mixing unit 10 through the food waste inlet valve 15, and the food leaving solution flows into the mixing unit 10 through the inlet valve 13 of the food leaving solution and mixes the mixture. In the section 10, the food waste is mixed with the food leaving solution and diluted.

In the food waste mixed with the food desorption liquid, the solids contained therein are crushed to a predetermined particle size by the pulverizing unit 20 and discharged to the storage unit 50 through the filtering unit 30, and then stored in the storage unit 50. The solid matter concentration of the food waste is calculated by the control unit 70 by the measured value by the measuring unit 52.

The control unit 70 maintains the solids concentration of the food waste stored in the storage unit 50 by adjusting the input amount of the food waste and the food desorption liquid introduced into the mixing unit 10, and then discharges the food waste into the anaerobic digestion tank.

Therefore, it is possible to maintain a constant solid concentration of food waste discharged to the food anaerobic digestion tank by the solid concentration control device of the present embodiment.

As described above, according to the present invention by adjusting the input amount of the food waste and the food desorption solution fed into the mixing unit according to the concentration of the solids measured by the measuring unit of the storage unit to maintain a constant concentration of the solid, it is supplied to the food anaerobic digestion tank It maintains the solid concentration of food waste to prevent the concentration of solids from changing according to season, day of the week, date and region, thereby improving the efficiency of food anaerobic digestion.

In addition, by forming a perforated network in which the perforated holes having different sizes of perforated holes are formed in the filtering part installed on the side wall of the mixing part, the food waste accumulated in the mixing part can be reduced to reduce the crushing load of the pulverizing part, and a rotary type inside the filtering part. By installing a scraper, it is possible to prevent clogging of the filtering part, and by calculating the concentration of the solids by the correlation equation based on the resistance value of the torque meter measured by the measuring unit, the concentration of the solids can be easily detected. .

The present invention described above can be embodied in many other forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be interpreted limitedly.

10: mixing unit 20: grinding unit
30: filtering unit 40: scraper
50: storage 60: stirring
70: control unit

Claims (4)

Food waste and the mixing portion in which the food desorbent is introduced and mixed;
A crushing unit installed under the mixing unit to crush the mixed food waste;
A filtering unit installed on the side wall of the mixing unit and filtering the crushed food waste to be discharged to the outside of the mixing unit;
A storage unit installed around the side wall of the mixing unit to store the discharged food waste;
A stirring unit installed in the storage unit to stir the stored food waste and water supply; And
It is installed in the storage unit; measuring unit for measuring the concentration of solids of the stirred food waste; includes;
The mixing unit, the solids concentration control device of the food waste, characterized in that for controlling the inflow of food waste and food desorption liquid in accordance with the solid concentration of the food waste measured in the measuring unit to adjust the concentration of food waste. The method of claim 1,
The filtering unit may include a first perforated network formed on the lower sidewall of the mixing unit, and a second perforated network formed on the upper sidewall of the mixing unit and having a perforation hole having a larger size than the first perforated network. Concentration control device. The method of claim 2,
And a rotary scraper is installed inside the first perforated network to prevent a blockage of the perforated hole of the first perforated network. The method of claim 1,
And the measuring unit measures a resistance value of the torque meter and calculates a solid concentration of food waste on the basis of the resistance value.

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