KR100481030B1 - Non-odor sludge drying system using closed system - Google Patents

Abstract

The present invention relates to a closed-type odorless sludge drying apparatus in which no odor is generated in drying sludge generated in various water treatment processes such as sewage treatment and wastewater treatment.

The present invention is composed of a sludge drying apparatus capable of largely drying sludge, a water condensation apparatus in which moisture evaporated from the sludge is condensed, and a deodorizing apparatus portion capable of removing odor generated by evaporation of water. The air flow is made to circulate by a guide system, and the flow path switching device is installed to change the flow path to the deodorizer by the amount of water. The apparatus of the present invention further includes a hot air generator for drying the sludge, a bottom heating device, a hot air temperature controller for controlling the temperature of the hot air, a temperature sensor, a blower for transferring evaporated water, and the like. .

Description

Non-odor sludge drying system using closed system

The present invention relates to a sludge drying apparatus, and more particularly, to a closed-type odorless sludge drying apparatus which is configured as a closed apparatus so that no odor is generated during drying.

Sludge is a kind of waste that is suspended from the liquid by floating or sedimentation, and is treated with water, industrial water, sewage / wastewater and general industrial (food, paper, pharmaceutical, manure, livestock, etc.). There are many sources of origin, including processes and product production processes.

Such sludge contains a large amount of water corresponding to about 70-80%, and due to the diversification of water treatment process and chemical process, the amount of generation of sludge along with organic / inorganic chemical waste is increasing rapidly.

Generally, sludge treatment methods include incineration, landfilling, composting, dumping at sea, and storage, and most of domestic treatment conditions depend on landfilling. However, while landfill has the advantage of low processing cost and mass processing, there are many problems such as water quality and soil pollution, landfill, and bad smell, and marine dumping also has the inevitable problem of marine pollution. It is time to come up with a solution. From January 1, 2001, the government enacted a law prohibiting direct landfilling for sludge (organic sludge). This is also a mandatory provision of landfill after incineration for sewage treatment plant sludge, which accounts for the majority of organic sludge.

In addition, in preparation for the growing number of odor-related complaints, from July 1, 2003, the odor prevention law is expected to be implemented.

Conventional sludge drying apparatus follows an open system, and a drying apparatus, a water condensation apparatus, and a deodorizing apparatus are separately installed outside. This may act to reduce waste heat and deodorization efficiency of the gas discharged from the drying apparatus.

Therefore, the present invention primarily aims to remove 70 to 80% of the moisture contained in the sludge to significantly reduce the volume of the sludge and to increase the recycling and incineration efficiency thereafter.

In addition, it is an object of the present invention to solve the problem of odor caused by drying the odor problem by solving the odor problem in the closed system drying apparatus.

The present invention provides a drying apparatus free of odor while drying sludge efficiently using a closed system. On the other hand, the general technique is that the drying device and the deodorizing device of the water condenser are combined in one unit process due to the characteristics of the closed system. In other words, the existing sludge drying apparatus follows an open system, and a drying apparatus, a moisture condensing apparatus, and a deodorizing apparatus are separately installed outside. This may act to reduce waste heat and deodorization efficiency of the gas discharged from the drying apparatus.

However, the closed odorless sludge drying apparatus of the present invention does not require an additional waste heat recovery device because no dry exhaust gas is discharged out of the apparatus until the sludge containing a large amount of water falls within 5% of the water content, and only heat insufficient in the apparatus is eliminated. Additional supply is possible. In addition, the water condensation unit and the deodorizer unit are included in the closed system, which has the advantage of removing both water-soluble and dry odors.

Accordingly, an object of the present invention is to provide a device capable of improving the efficiency of drying sludge, the simplicity of the drying step, the odorlessness, and lowering the drying cost as a closed system of odorless sludge drying apparatus incorporating the existing complex sludge drying apparatus. .

The present invention for achieving the above object is largely composed of a sludge drying device, a water condensation device, and a deodorizer, these are packaged so that the air is circulated by a closed system by the air guide device to constitute a single device There is a characteristic.

A condensate storage tank for storing the water condensed in the water condenser is further included, and a flow path switching device for changing the air flow path to either of the water condensation device and the deodorizer is installed. It is configured to include a hot air device for applying, a bottom heating device for heating the floor and a stirring device for stirring the sludge.

In addition, the controller is provided with a means for temperature setting, moisture value setting and operation time or operation control of each part. The temperature sensor and moisture sensor are installed in the jade guide device to adjust the device operation time as temperature control by temperature sensing. By controlling the moisture, by selectively changing the air flow path to the water condensation device or the deodorizing device to control the drying and deodorization process for water removal.

In the present invention as described above, the closed odorless sludge drying apparatus is a sludge drying apparatus, a moisture condensing apparatus, and a deodorizing apparatus formed of a closed system, and is composed of one apparatus. Therefore, when the sludge containing water is introduced into the apparatus, the water is primarily evaporated by hot air. The evaporated water contains a large amount of water-soluble odorous substances, which are condensed by water condensation apparatus connected to the water to remove the water-soluble odorous substances, and the dry air is circulated back to the drying apparatus to absorb water again.

This process is repeated until the moist sludge is completely dried. After the sludge is completely dried, the air circulating in the device will circulate only the very low dry air and leave only a few dry odors. At this stage, the air flow is changed from the water condenser to the deodorizer and continues to circulate in the apparatus until the dry odorous substances contained in the dry air are completely removed.

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

<Example>

1 is a block diagram of a closed system odorless sludge drying apparatus according to the present invention. As shown therein, a drying apparatus 10 for drying the sludge by applying heat in the tank to evaporate moisture, and a hot air for drying the sludge by blowing hot air into the drying apparatus 10 and blowing the evaporated moisture. Apparatus 20, a water condensation apparatus 30 for condensing water evaporated from the sludge, a deodorizing apparatus 40 capable of removing the odor generated by the water evaporation, and the water condensation apparatus 30 The condensate storage tank 50 for storing the water condensed in the water, and the water and air evaporated from the sludge drying apparatus 10 through the deodorizer 40 and the water condenser 30 in parallel to the condensate storage tank The air guide device 60 which is sent into the 50 and passes through the hot air device 20 again and blown to the drying device 10, and the drying in which the water in the air guide device 60 becomes less than a predetermined value. Deodorizer (40) side only when And an air flow path switching device 70 for changing the air flow path.

The temperature sensor 81 for detecting the temperature of the hot air in the air passage of the guide device 60, the moisture detection sensor 82 for moisture detection, and the sensing temperature of the temperature sensor 81 to match the set temperature Control the flow path switching device 70 to adjust the hot air temperature of the hot air device 20, and to change the flow path to the deodorizing device 40 when a predetermined moisture or less by the moisture detection of the water detection sensor 82. It further comprises a controller 80 for the operation control of. That is, the controller 80 is configured to set the flow path switching according to the temperature setting, the operation control, and the moisture detection, the flow path switching according to the predetermined operation time, and is configured to control the temperature control and the flow path switching by the set values.

The drying apparatus 10 includes a drying tank 11 for drying evaporation of moisture by heat inside the sludge, and a sludge stirring apparatus 12 for stirring the sludge in the drying tank 11 in a drying process. It is composed of a bottom heating device 13 for applying heat at the bottom of the drying tank (11).

The air guide device 60, the air duct communicating with the upper portion of the drying device 10 passes through the deodorizing device 40 and the water condensing device 30 in parallel to dry air to the hot air device 20 It consists of a duct pipe to form a closed system to circulate to the drying device 10, the water evaporated to a predetermined position connected from the drying device 10 to the deodorizing device 40 and the water condensing device 30 side It is configured to further include a blower 61 for blowing.

The deodorizing device 40 and the water condensing device 30 form through holes at end portions of the duct lowered downward of the air guide device 60, respectively, and are connected to the side walls, and the duct connected to the condensate storage tank 50. Through holes are formed in the side walls of the deodorizing device 40 and the condensation device 30 and the through holes formed in the lower side walls of the condensation device 30 are installed in parallel.

In addition, opening and closing holes are provided in each of the through holes of the water condensing device 30 and the deodorizing device 40, and each opening and closing hole is selectively selected by the deodorizing device 40 and the water condensing device 30 by the flow path switching device 70. It is configured to open and close to form an air flow path.

The deodorizer 40 is known to remove odors in the dry air by using an adsorbent therein, and any kind of adsorbent may be used, but any of these may be used, but activated carbon is most preferred.

The present invention configured as described above can be largely divided into sludge drying, water condensation and odor removal, and the odors are prevented from leaking to the outside by treating them in one closed system.

First, the sludge containing moisture flows into the sludge drying apparatus 10 and then heats the sludge in the drying tank 11 by the hot air blower 20 and the bottom heating device 13. At this time, by continuously stirring the sludge by the stirring device 12, it is dried evenly.

 Water evaporated from the drying apparatus 10 flows to the water condenser 30 and the deodorizer 40 through the air guide device 60, and the blower 61 in the guide device 60 receives the evaporated water. The included air is blown to the deodorizing device 40 and the water condensation device 30 side.

The water condensation device 30 is set to a low temperature so that the air containing the water transferred as the temperature is lowered through the guide device 60 is condensed in the water condensation device 30 and collected in the condensate storage tank 50. And, the dry air continues to be sent to the hot air apparatus 20 through the guide device 60 and heated with hot air in the hot air apparatus 20 and circulated to the drying apparatus 10. This circulation continues until the water of the sludge introduced into the sludge dryer 10 is completely evaporated.

When the moisture contained in the sludge is completely evaporated, there is no moisture in the air circulated in the apparatus, and only the odorous substance is mixed with the air. The moisture sensor 82 detects whether the controller 80 is dry air without moisture, When the controller 80 detects moisture below a predetermined level (eg, 5% or less moisture), the controller 80 controls the switching device 70 to change the flow path of air from the water condenser 30 to the deodorizer 40. .

 The flow path switching device 70 may be configured to install a solenoid opening and closing opening in the through hole of the deodorizing device 40 and the water condensation device 30 to switch the flow path. Then, the moisture detection sensor 82 is installed together with the temperature sensor 81 to compare the moisture detection value in the controller 80 with the set value, when the set value is less than the set value is judged to be a dry state to switch the air flow path to the deodorizing device 40 side. To control.

Therefore, the integrated process of removing moisture first and odor second is performed together in one device. The rate at which the water evaporates or the rate at which the water is condensed may be controlled by controlling the temperature of the temperature sensor 71 and the controller 80.

2 and 3 show the sludge drying curve and the water condensation amount carried out by the present invention. Sludge drying and water condensation were obtained at the same time, sludge drying was found to be lowered from 83% to 3% moisture content, and moisture condensation was also very efficient.

The present invention does not require an additional water condensation device and a dry exhaust gas treatment device for drying the sludge. Since the structure of the whole device is simple and the closed system, there is no emission of odorous substances to the outside. It is effective to maintain cleanliness and comfort.

1 is a block diagram of a closed system odorless sludge drying apparatus according to the present invention.

2 and 3 are exemplary views showing the sludge drying curve and the water condensation amount according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: drying apparatus 11: drying tank

12: stirring device 13: base heating device

20: hot air device 30: moisture condensation device

40: deodorizing device 50: condensate storage tank

60: air guide device 61: blower

70: flow path switching device 80: controller

81: temperature sensor 82: humidity sensor

Claims (4)

A drying apparatus for drying the sludge by applying heat in the tank to evaporate moisture; A hot air device for blowing hot air into the drying device to dry the sludge and for blowing evaporated water; A water condenser for condensing water evaporated from the sludge; Deodorizing device that can remove the odor generated with the water evaporation; Condensate storage tank for storing the water condensed in the water condensation device; An air guiding device for circulating air by passing moisture and air evaporated from the sludge drying device selectively through a deodorizing device and a water condensation device by changing a flow path and passing the hot air device again to form a closed system to the drying device; A closed system odorless sludge drying apparatus, comprising an air flow path switching device for changing the air flow path to the deodorizing device only when the air in the air guide device is in a dry state in which moisture is below a predetermined value. The method of claim 1, Install a temperature sensor for detecting the temperature of the hot air in the air passage of the guide device, and a moisture detection sensor for moisture detection, Adjusting the hot air temperature of the hot air device to adjust the detected temperature of the temperature sensor to the set temperature, and controls the flow path switching device to change the flow path to the deodorizing device when the water is less than the predetermined moisture by the water detection sensor, The closed system odorless sludge drying apparatus further comprises a controller for starting operation of the device and controlling heating and blowing by a user's operation. The method of claim 1, wherein the drying apparatus, A drying tank for drying the sludge by evaporating moisture by heat from inside, A sludge agitator for agitating sludge in the drying tank during the drying process, Closed odorless sludge drying apparatus comprising a bottom heating device for applying heat in the lower portion of the drying tank. According to claim 1, The air guide device, The air duct communicating with the upper part of the drying device 10 is passed through the deodorizing device and the water condensing device in parallel to the duct pipe for circulating in a closed system to the hot air device and the drying device, in the drying device A closed system odorless sludge drying apparatus, characterized in that it further comprises a blower for blowing the water evaporated to a predetermined position connected to the deodorizing device and the water condenser.