KR101365734B1 - The dehydration and aridity of the constructional sludge - Google Patents

Abstract

The present invention relates to an apparatus for dehydrating and drying constructional sludge. The purpose of the present invention is to minimize the water content rapidly by alternately performing the dehydrating and drying processes and to suppress odor generation. The apparatus for dehydrating and drying constructional sludge comprises: a sludge supply screw (10) for supplying the sludge; a vibrating dehydration screen (20) for dehydrating the sludge supplied from the sludge supply screw by vibration; a drying means (40) for drying the sludge which is dehydrated by the vibrating dehydration screen; an odor suppressing means (50) which sprays liquid potassium silicate to the dehydrated sludge dried by the drying means; and a discharging means (60) which transfers dried and deodorized sludge by the drying means and the odor suppressing means. The drying means comprises: a closing drying chamber (41); a transfer conveyor (42) which is mounted inside the drying chamber and transfers the dehydrated sludge; a mixing means for mixing the dehydrated sludge transferred by the transfer conveyor; and one or more hot air fan (43) for drying the moisture contained in dehydrated sludge transferred by the transfer conveyor by applying hot wind to the inside of the drying chamber. The odor suppressing means comprises: a liquid potassium silicate tank (51); a pump (52) moving the liquid potassium silicate stored in the liquid potassium silicate tank; a supplying pipe (53) which is piped inside the drying chamber and supplies the liquid potassium silicate transferred by the pump; and a nozzle (54) for spraying the liquid potassium silicate supplied from the supplying pipe.

Description

Construction sludge dehydration drying unit {THE DEHYDRATION AND ARIDITY OF THE CONSTRUCTIONAL SLUDGE}

The present invention relates to a construction sludge treatment apparatus, and more particularly, by treating the construction sludge in parallel with the dehydration and drying process to minimize the water content and reduce the odor generated during the treatment of sludge. It relates to a construction sludge dehydration drying apparatus to improve the environment.

Construction wastes generated in Korea amount to about 60 million tons per year, accounting for 53% of the total domestic waste. Construction waste can be divided into recyclable waste such as waste concrete, waste asphalt concrete, waste brick, waste block, waste wood, and waste such as construction sludge.

Construction sludge has high water content and is treated through waste concrete and other intermediate treatment processes. In other words, by dehydrating the water of the construction sludge to form a concentrated form with the lowest water content, the water content is reduced and the volume is minimized.

Looking at the conventional technologies for the treatment of construction sludge, Patent Application No. 10-1999-0055497 relates to a dewatering device that can facilitate the handling by reducing the volume of waste by removing the waste water or sludge moisture, the fine spacing between each other A plurality of triangular bar to maintain is composed of a cylindrical having a dewatering groove extending outward, the dewatering portion consisting of a plurality of flanges that are fixed to the outside of the triangular bar for holding and fixing the triangular bar, and on one side of the dewatering portion An inlet for injecting the formed dehydrated object, an outlet for discharging the dehydrated liquid formed on the outside of the dewatering part, a drive shaft positioned on the shaft of the cylindrical dewatering part, and having a plurality of transfer screws formed thereon, and driving means connected to the drive shaft. And, formed on one side of the drive shaft to discharge the solid sludge is discharged when the pressure is above a certain pressure The dewatering device by the configured triangular bar screen is presented.

Patent application No. 10-2009-0076181 relates to a unitary dehydration and concentration type coagulation reaction apparatus, wherein the outer container has a clearance to the upper side of the inner container in the state of receiving the inner container as the inner space, The space around the outer circumference of the inner container forms a space for a single discharge stage that introduces concentrated sludge with flocculant and separates it into water and dehydrated sludge, and uses the rotational force of the motor of the stirrer to By providing a cleaner with a brush to wipe the inner surface, it realizes the stirring action to increase the responsiveness of the sludge injected with the flocculant to promote the reaction and eliminates the screen clogging caused by the sludge particles. At the same time, it presents a technique for making concentrated sludge through the gravity action dehydration process.

The above techniques are only dehydration techniques as a technique for dewatering device for separating water and sludge by centrifugal type or gravity type, but they also suggest a technique for removing possible moisture by drying or rehydrating. not.

In addition, there is a technology (Registration No. 10-1222452) that can be dewatered and dried sludge.

Patent No. 10-1222452 has the advantage of minimizing the moisture content and minimizing the volume by dehydrating and drying the sludge, but it does not remove the odor that sludge has. Frequent complaints have been received, and environmental improvement is required.

Patent Application No. 10-1999-0055497 Patent Application No. 10-2009-0076181

The present invention is to solve the problems as described above, by treating the construction sludge in parallel with the dehydration and drying process to quickly minimize the moisture content and reduce the odor generated during the treatment process of sludge and the environment of the sludge treatment site The purpose is to provide a construction sludge dehydration drying apparatus that can improve the.

Construction sludge dewatering drying apparatus according to the present invention, the sludge supply unit for supplying the construction sludge; A vibration dewatering screen for dewatering sludge supplied by the sludge feeder by vibration; Drying means for drying the dewatered sludge dewatered by the vibrating dewatering screen; Odor reduction means for spraying liquid potassium silicate on the dewatered sludge dried by the drying means; And a discharge means for transferring the sludge dried and deodorized by the drying means and the odor reducing means, wherein the drying means includes a hermetic drying chamber, a dry transfer means installed in the drying chamber and transferring dehydration sludge, A brush mixing the dewatering sludge conveyed by the dry conveying means, and applying one or more hot air to the inside of the drying chamber to dry moisture contained in the dewatering sludge conveyed by the dry conveying means, and the odor reducing means includes: A liquid potassium silicate tank, a pump for pumping the liquid potassium silicate stored in the liquid potassium silicate tank, a supply pipe for supplying the liquid potassium silicate pumped by the pump and installed inside the drying chamber, and installed in the drying chamber. And a nozzle for injecting liquid potassium silicate supplied from the supply pipe. The.

According to the construction sludge dehydration drying apparatus according to the present invention, a construction sludge having a high moisture content can be changed into a dry sludge having a low water content through a continuous process of dehydration and drying, so that a dry sludge having an appropriate moisture content can be obtained without using an additional facility. Reliability as a dry sludge manufacturing facility can be improved, and recycling or disposal of sludge becomes easy.

1 is a block diagram of a construction sludge dehydration drying apparatus according to the present invention.

As shown in Figure 1, the construction sludge dewatering drying apparatus according to the present invention, by applying the sludge supply screw 10, the sludge supply screw 10 to supply the construction sludge 1, the construction sludge is supplied to the construction sludge Vibration dewatering screen 20 to shake off the moisture contained in the water, the water collecting box 30 to collect the water dehydrated by the vibration dewatering screen 20, dewatering sludge dehydration by the vibration dewatering screen 20 (2) ) Drying means 40 for drying), odor reducing means 50 for removing odors from the drying atmosphere by the drying means 40, and drying sludge 3 (dried by drying means 40). It becomes a reusable state can be referred to as earth and sand) is composed of a discharge means (60) for discharging.

The sludge supply screw 10 is installed in the screw case 11 and rotates by a motor to supply the construction sludge 1 to the lower vibration dewatering screen 20 through a discharge port by a predetermined amount.

Vibration dewatering screen 20 is equipped with a plurality of dehydration hole is installed through a vibration motor and coil spring, etc. by applying vibration to the construction sludge (1) supplied from the sludge supply screw 10 to build the construction sludge (1) The water contained in the sludge (1) is dehydrated.

The vibrating dewatering screen 20 is sealed through the loop 21 so that fine particles, moisture, and odors do not leak to the outside during the dehydration process of the construction sludge (1), and of course, the inlet and dewatering sludge into which the construction sludge (1) is introduced ( The outlet 2) is discharged.

When the dewatering sludge 2 dewatered from the vibrating dewatering screen 20 is transferred to the drying chamber 41 of the drying means 40, a closed connection duct is configured so that fine particles, moisture, and odors do not leak to the outside. The connection duct is preferably flexible or configured in the form of a wrinkle film in view of the vibration of the vibration dewatering screen 20.

The collecting box 30 is a tub installed at the bottom of the vibrating dewatering screen 20 and collects water dewatered from the vibrating dehydrating screen 20.

The drying means 40 is installed in the hermetic drying chamber 41, the drying chamber 41, and the drying conveying conveyor 42, which transfers the dewatering sludge supplied from the vibration dewatering screen 20, inside the drying chamber 41. It is composed of one or more hot air blowers (43) for blowing the hot air to dry the dewatering sludge (2) conveyed through the dry transfer conveyor (42).

The drying chamber 41 is a closed type in which only the inlet of the dewatering sludge 2 and the outlet of the drying sludge 3 are opened.

The bottom of the drying chamber 41 may be provided with a collecting box 45 for collecting the liquid or particulate waste generated in the drying chamber 41. The collecting box 45 may be configured to be stored in the drying chamber 41 or may be integrally formed with a drain hole.

The dry conveying conveyor 42 conveys the dewatering sludge 2 while rotating in an endless track. The dry conveying conveyor 42 is a material that is not thermally deformed and may be both without holes and with holes.

The hot air blower 43 blows air heated by heating means such as a hot wire or a boiler (temperature for dehydrating water from the dewatering sludge, which may be, for example, a temperature of 80 to 110 ° C.), into the drying chamber 42. The drying chamber 41 is then formed in a drying atmosphere of the dewatering sludge to dry the dewatering sludge.

The operation of the hot air fan 43 and the heating means may be controlled based on a detection value of a temperature sensor that senses a temperature inside the drying chamber 41. For example, the controller may be configured to adjust the current temperature detected by the temperature sensor. By comparing the preset reference temperature, if the current temperature is lower than the reference temperature, it is determined that the drying rate is low. Therefore, the operation rate of the heating means and the hot air blower 43 is increased to supply heat of a higher temperature, and the current temperature is set to the reference temperature. If satisfied, control to maintain current operation.

When the dewatered sludge 2 is dried by hot air, the dewatered sludge 2 at the bottom of the dry conveying conveyor 42 is discharged in a non-dried state because no hot air is applied. In order to solve this disadvantage, a disturbing brush 44 is applied.

The disturbing brush 44 is rotated by a motor (slow speed) and disturbs the dewatering sludge 2 which is transported on the dry conveying conveyor 42 so that all the dewatering sludge 2 is dried.

The dried sludge dried in the drying chamber 41 is freely dropped from the discharge end of the dry transfer conveyor 42 to the scraper type discharge conveyor 61.

The present invention can be applied to the microwave oscillator to the drying means (40). The microwave oscillator may increase the drying efficiency by drying the dewatering sludge transferred along the dry conveying conveyor 42 by oscillating the dry microwave wave.

In addition, the dehydration sludge 2 may be sprayed with water (which may be steam) to increase the drying efficiency of the water contained in the dewatering sludge 2. Spray means for spraying water to the dewatering sludge (2) may use the water collected in the collecting tank (30).

It is composed of a pump, a supply pipe for supplying the water pumped by the pump, the spray nozzle for spraying the water supplied by the supply pipe in order to water the water collected in the collecting tank 30 into the drying chamber 41. Heating means for steaming the water supplied through the supply pipe may be further applied. The water to be sprayed serves to dry the moisture of the dehydrated sludge (2) to enable rapid drying.

The odor reduction means 50 includes a liquid potassium silicate tank 51 in which liquid potassium silicate is stored, a pump 52 for pumping liquid potassium silicate stored in the liquid potassium silicate tank 51, a liquid potassium silicate tank 51 and Supply pipe 53 for supplying the liquid potassium silicate, which is piped over the drying chamber 41 and pumped by the pump 52, installed inside the drying chamber 41, and sprays the liquid potassium silicate supplied from the supply pipe 53 It consists of one or more nozzles 54.

Discharge means 60 is for transporting the dry sludge (3) discharged from the drying chamber 41, for example, a scraper-type discharge conveyor (61) having a plurality of scrapers (62) on the surface rotates in an infinite orbit, The scraper type discharge conveyor 61 may be configured as a sealed discharge case 63 installed therein. The sealed discharge case 63 discharges and transfers the dry sludge 3 discharged from the drying chamber 41 by communicating with the discharge end of the drying chamber 41 (communicating through a separate duct). The scraper 62 is used to allow the moisture in the dried sludge heated by the hot air to dry faster than the general conveyor by allowing the dried sludge to be inverted several times, mixed with each other, and exposed to the air during the transfer of the dried sludge. That is, since there is a limit in increasing the size of the drying chamber 41, the drying efficiency may not be great in the process of passing through the drying chamber 41, and the scraper 62 mixes the dry sludge having heat to prevent all moisture. To dry quickly.

Construction sludge dehydration drying method according to the present invention is as follows.

1. Construction sludge input.

For example, construction sludge having a moisture content of 75% or more is introduced into the screw case 11, and the sludge supply screw 10 inputs the construction sludge 1 to the vibration dewatering screen 20 by a predetermined amount.

2. Dehydration.

The vibration dewatering screen 20 shakes off the moisture contained in the construction sludge 1 by applying vibration to the construction sludge 1. The dewatered water from the construction sludge 1 is collected in the collecting box 30 at the bottom of the vibrating dewatering screen 20, and the dewatering sludge 2 is transferred to the drying chamber 41.

3. Dry.

The inside of the drying chamber 41 maintains a dry atmosphere by the high temperature heat blown by the hot air blower 43.

The dewatering sludge 2 introduced into the drying chamber 41 moves in the drying chamber 41 by the dry transfer conveyor 42, and in this process, moisture is dried by the drying atmosphere inside the drying chamber 41. In addition, the disturbing brush 44 disturbs the dewatering sludge 2 moving on the dry conveying conveyor 42, thereby overturning the dewatering sludge 2 buried on the bottom side of the dry conveying conveyor 42, thereby displacing all the dewatering sludges (2). To dry.

4. Eliminate odors.

The pump 52 of the odor reducing means 50 pumps the liquid potassium silicate stored in the liquid potassium silicate tank 51, and the liquid potassium silicate is injected into the drying chamber 41 through the nozzle 54. Liquid potassium silicate removes the odor of dehydrated sludge (2). Liquid potassium silicate forms a thin film on the surface of dried sludge (dry soil) and reduces the leakage of soil odor as it dries. (Real effect of more than 90% in actual odor test)

5. Exhaust.

The dried sludge (3) in which moisture is dried while moving inside the drying chamber (41) is discharged and transported through the scraper-type discharge conveyor (61), and in this process, the dried sludge (3) is inverted and mixed by the scraper (62). Quickly dry moisture in all areas.

10: sludge supply screw, 20: vibration dewatering screen
30: collecting box, 40: drying means
41: drying chamber, 42: dry conveying conveyor
43: hot air fan, 44: disturbing brush
50: odor reduction means, 51: liquid potassium silicate tank
52 pump, 53 supply pipe
54: nozzle,

Claims (3)

A sludge feeder for supplying construction sludge;
A vibration dewatering screen 20 for dewatering sludge supplied from the sludge feeder by vibration;
Drying means (40) for drying the dewatered sludge dehydrated by the vibrating dewatering screen;
Odor reduction means (50) for injecting liquid potassium silicate to the dehydrated sludge dried by the drying means;
It includes a discharge means for transporting the sludge dried and deodorized by the drying means and odor reduction means, 60
The drying means is a hermetic drying chamber (41), a drying conveying means installed in the drying chamber and conveying the dewatering sludge, disturbing means for mixing the dewatering sludge conveyed by the dry conveying means, hot air inside the drying chamber. Adding one or more hot air blowers 43 for drying the moisture contained in the dewatering sludge conveyed by the dry transfer means,
The odor reduction means includes a liquid potassium silicate tank, a pump for pumping the liquid potassium silicate stored in the liquid potassium silicate tank, a supply pipe for supplying the liquid potassium silicate piped inside the drying chamber and pumped by the pump, and the drying And a nozzle installed inside the chamber and including a nozzle for injecting liquid potassium silicate supplied from the supply pipe. The water collecting box for collecting water dewatered by the vibrating dewatering screen, and spraying means for spraying water collected in the water collecting box into the drying chamber to help dry the dewatering sludge. Construction sludge dehydration drying unit. The construction sludge dewatering and drying apparatus according to claim 1 or 2, wherein the drying means includes a microwave oscillator mounted inside the drying chamber and oscillating microwaves to dry the moisture of the dewatering sludge.

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