KR101135122B1 - Apparatus and method for processing sewage sludge using electric dehydration, microwave and hot wind - Google Patents

Abstract

PURPOSE: An apparatus and a method for treating sewage sludge are provided to reduce electricity consumption and to improving mechanical stability of the method. CONSTITUTION: A mixing tank(110) receives sewage sludge and polymer and mixes the sewage sludge and the polymer. A belt press(120) dehydrates sewage sludge discharged from the mixing tank. A first transferring conveyor(130) transfers sludge cake discharged from the belt press. An electro-osmosis dehydrator compresses and dehydrates the sludge cake from the first transferring conveyor. A second transferring conveyor(150) transfers the sludge cake from the electro-osmosis dehydrator. A sludge drying part(160) dries the sludge cake from the second transferring conveyor based on the irradiation of micro wave. A hot wind blower supplies hot wind into the drying part.

Description

Apparatus and method for sewage sludge treatment using electric dehydration, microwaves and hot air {APPARATUS AND METHOD FOR PROCESSING SEWAGE SLUDGE USING ELECTRIC DEHYDRATION, MICROWAVE AND HOT WIND}

The present invention relates to an apparatus and method for treating sewage sludge using electric dehydration, microwaves, and hot air, and in particular, a belt press, an electric dehydrator, and a dryer are sequentially connected and installed to gradually lower the water content of the sludge in each step. The present invention relates to an apparatus and method for treating sewage sludge using electric dehydration, microwaves, and hot air for discharging a dry matter.

Conventional methods for treating sewage sludge include incineration, landfill, ocean dumping, stabilization using slaked lime, and earthworm treatment.

However, such conventional treatment methods are often limited by environmental regulations. Therefore, it is urgent to develop a new treatment method that can suppress the environmental pollution as much as possible to avoid the above restrictions.

In particular, in the treatment of sewage sludge, drying and weight reduction are important. In the related art, weight reduction is achieved by a simple drying method of simply removing heat by applying heat to sewage sludge.

However, in the conventional weight reduction method, since the water of the sewage sludge is removed only by heating by a heat source, a considerable amount of energy is consumed for this purpose, resulting in excessive energy costs for the sewage sludge treatment.

Korean Patent Registration No. 10-0541159 (Sewage Sludge Treatment Apparatus and Method Using Microwave and Heating) has been developed by the present applicant to solve this problem.

The apparatus and method for treating sewage sludge using microwaves and heating can save energy consumed by decomposing, solubilizing and reducing sewage sludge generated in a sewage treatment plant, and improve anaerobic digestion efficiency for microorganisms in sewage sludge. As shown in FIG. 1, the sewage sludge and charcoal and activated carbon before the sewage sludge is introduced into the dryer 10 are provided with a dryer 10 for drying and reducing the sewage sludge generated in the sewage treatment plant as shown in FIG. 1. The stirring apparatus 20 is provided so that it may inject and stir and mix it, and the dryer 10 heats the microwave generator 11 which generate | occur | produces a microwave, and the inside of the dryer 10 to predetermined temperature. A hot air heater 12 is provided; The sewage sludge introduced into the dryer 10 is decomposed, solubilized and reduced by the combination of the microwave irradiation from the microwave generator 11 and the heating from the hot air heater 12. In Fig. 1, reference numeral 20 is a stirring tank, 30 is a centrifugal concentrator, 40 is a condenser, and 50 is a biofilter.

However, the conventional sewage sludge treatment apparatus and method using the microwave and heating is low in efficiency because it lowers the moisture content depending only on the dryer, and by lowering the moisture content in the dryer consumes a lot of electricity, and the mechanical stability is poor have.

The present invention is to solve the problems as described above, by connecting the belt press, the electric dehydrator and the dryer in order to gradually lower the water content of the sludge in each step to discharge the sludge cake to the dry to relatively increase the efficiency, It is an object of the present invention to provide an apparatus and method for treating sewage sludge using electric dehydration, microwave and hot air, which consume less electricity and have high mechanical stability.

Features of the present invention for achieving the above object,

A mixing tank that receives sewage sludge and a polymer and mixes them; A belt press for dewatering sewage sludge discharged from the mixing tank; A primary transport conveyor for transporting the sludge cake discharged from the belt press; An electric permeation dehydrator for compressing and dehydrating the sludge cake introduced from the primary transport conveyor at a high temperature; A secondary transport conveyor for transporting the dry sludge cake discharged from the electroosmotic dehydrator; A sludge drying unit for drying the dry sludge cake introduced from the secondary transfer conveyor using hot air and microwaves; And a deodorizing unit which deodorizes water vapor and odor emitted from the electric permeation dehydrator and the sludge drying unit and releases it to the atmosphere.

Here, the wastewater discharged from the mixing tank, the belt press and the electroosmotic dehydrator is discharged to the wastewater treatment plant for reprocessing.

Here, also, the belt press and the electroosmotic dehydrator are supplied with miscellaneous water to wash the belt press and the electroosmotic dehydrator.

Here, the sludge drying unit includes a dryer for irradiating microwaves to the sludge cake introduced from the secondary conveying conveyor and drying the microwave; A hot air fan for supplying hot air to the dryer; A heat exchanger for exchanging heat of steam discharged from the dryer and supplying the heat to the hot air fan; A blower installed between the hot air blower and the heat exchanger to supply combustion air to the hot air blower; An export conveyor for discharging the sludge cake discharged from the dryer; And a hopper in which the dry sludge cake to be taken out of the carrying conveyor is stored.

Here, the dryer is installed alone or a plurality of parallel connection is installed.

Here, if a plurality of the dryer is installed, a screw-type third conveying conveyor is installed at the front end of the dryer to distribute and supply the sludge cake to each dryer.

Here, the deodorizing unit comprises a wet dust collector for collecting dust contained in the water vapor discharged from the heat exchanger of the sludge drying unit; A wet deodorizer for deodorizing the odor discharged from the sludge drying unit and the wet dust collector and discharging it into the atmosphere; A washing water storage tank for supplying and storing time constant and discharging the sewage discharged from the dust collector to a manhole; A washing water supply pump supplying the washing water stored in the washing water storage tank to the wet dust collector; A water storage tank in which time constant water is supplied and stored, and discharges wastewater discharged from the wet deodorizer to a manhole; And a water supply pump for supplying the water stored in the water storage tank to the wet deodorizer.

According to another aspect of the present invention,

A sewage sludge treatment method using the sewage sludge treatment apparatus using electric dehydration, microwaves and hot air, comprising: a mixing step of mixing and discharging sewage sludge and a polymer from a mixing tank; A dewatering process of dewatering and discharging sewage sludge discharged from the mixing tank by a belt press; A primary conveying process of conveying the sludge cake discharged from the belt press to a primary conveying conveyor; An electropermeation dehydration process of compressing and dehydrating the sludge cake transferred from the primary transport conveyor to the electroosmotic dehydrator at a high temperature; A second conveying process of conveying the sludge cake discharged from the electroosmotic dehydrator to a secondary conveying conveyor; A drying step of drying the sludge cake transferred from the secondary conveying conveyor to the sludge drying unit by using hot air and microwaves; And a deodorization process of deodorizing water vapor and odor generated by the secondary dehydration process and the drying process and releasing it to the atmosphere.

According to the present invention, the sewage sludge treatment apparatus and method using the electric dehydration and microwave and hot air configured as described above, by connecting the belt press, the electric dehydrator and the dryer in sequence to gradually lower the water content of the sludge in each step to dry sludge Emissions to the cake can increase efficiency, consume less electricity and increase mechanical stability.

1 is a system diagram showing the configuration of a sewage sludge treatment apparatus using a conventional microwave and heating.
Figure 2 is a schematic diagram schematically showing the configuration of the sewage sludge treatment apparatus using electric dehydration, microwaves and hot air according to the present invention.
Figure 3 is a system diagram showing the configuration of the mixing tank, the belt press and the electric penetration dehydrator of the sewage sludge treatment apparatus using electric dehydration, microwaves and hot air according to the present invention.
Figure 4 is a system diagram showing the configuration of the sludge drying unit of the sewage sludge treatment apparatus using electric dehydration and microwave and hot air according to the present invention.
Figure 5 is a schematic diagram showing the configuration of the deodorizing portion of the sewage sludge treatment apparatus using electric dehydration and microwave and hot air according to the present invention.
6 is a process chart for explaining the sewage sludge treatment method using the electric dehydration and microwave and hot air according to the present invention.

Hereinafter, with reference to the accompanying drawings the configuration of the sewage sludge treatment apparatus using electric dehydration and microwave and hot air according to the present invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Figure 2 is a schematic view showing the configuration of the sewage sludge treatment apparatus using electric dehydration and microwave and hot air according to the present invention, Figure 3 is a mixing tank of the sewage sludge treatment apparatus using electric dehydration and microwave and hot air according to the present invention And is a schematic diagram showing the configuration of the belt press and the electric penetration dehydrator, Figure 4 is a schematic diagram showing the configuration of the sludge drying unit of the sewage sludge treatment apparatus using electric dehydration and microwave and hot air according to the present invention, Figure 5 is This is a system diagram showing the structure of the deodorizing unit in the sewage sludge treatment apparatus using electric dehydration, microwaves and hot air.

2 to 5, the sewage sludge treatment apparatus 100 using electric dehydration, microwaves, and hot air according to the present invention includes a mixing tank 110, a belt press 120, and a primary transport conveyor 130. ), An electroosmotic dehydrator 140, a secondary transfer conveyor 150, a sludge drying unit 160, and a deodorizing unit 170.

First, the mixing tank 110 receives sewage sludge and polymer, mixes them, converts them into a gel state, and discharges them. Here, the wastewater discharged from the mixing tank 110 is discharged to the wastewater treatment plant and reprocessed.

Then, the belt press 120 dehydrates the sewage sludge in the gel state discharged from the mixing tank 110 to discharge the sludge cake (SC). Here, the belt press 120 is provided with a recycling system 121 and a washing pump 123, the inside of the belt press is washed by the general purpose water, the wash water and waste water is discharged to the wastewater treatment plant. Here, two or more belt presses 120 may be installed in parallel or in series connection.

In addition, the primary transport conveyor 130 transfers the sludge cake (SC) discharged from the belt press 120.

In addition, the electroosmotic dehydrator 140 compresses and dehydrates the sludge cake SC introduced from the primary transfer conveyor 130 at a high temperature. Here, the electric penetration dehydrator 140 is provided with a washing water tank 141 and a high pressure washing pump 143, the inside of the electrofiltration dehydrator 140 is washed by the general purpose water, the general purpose water is supplied to the internal cooling water, the coolant is the wash water tank 141 Is recovered and discharged to the wastewater treatment plant.

On the other hand, the secondary transfer conveyor 150 transfers the sludge cake (SC) discharged from the electro-osmotic dehydrator (140).

The sludge drying unit 160 includes a dryer 161, a hot air blower 162, a heat exchanger 163, a blower 164, a transport conveyor 165, and a hopper 166.

The dryer 161 irradiates microwaves to the sludge cake (SC) introduced from the secondary transfer conveyor 150 to dry. Here, the dryer 161 has a sealed structure, and a multi-stage conveyor 161a and a plurality of microwave generators 161b are provided therein, and the microwave generator 161b is disposed in the sludge cake SC that is transferred to the conveyor. Irradiates a microwave having a frequency of 2.45 GHz at, and dries the sludge cake (SC) by hot air supplied from the hot air blower 162. Here, the dryer 161 is installed alone or two or more are installed in parallel or in series connection, as shown in Figure 4 when a plurality of dryers 161 are installed in front of the dryer 161 in the form of a screw A tertiary transfer conveyor 161c is installed to distribute and supply the sludge cake SC to each dryer 161.

The hot air fan 162 supplies the high temperature hot air generated by using electric energy to the dryer 161.

The heat exchanger 163 exchanges and discharges heat of steam discharged from the dryer 161, and supplies heat-exchanged air to the hot air blower 162. Here, the bypass pipe 163a is connected to the front end and the discharge end of the heat exchanger 163, the valve 163b may be installed to immediately discharge the water vapor.

The blower 164 is installed between the hot air blower 162 and the heat exchanger 163 to supply combustion air to the hot air blower 162 with heat-exchanged air discharged from the heat exchanger 163.

The export conveyor 165 takes out the sludge cake SC discharged from the dryer.

The hopper 166 is stored in the sludge cake (SC) taken out of the conveyor 165 is carried out to the outside.

In addition, the deodorizing unit 170 is a wet dust collector 171, a wet deodorizer 172, a washing water storage tank 173, a washing water supply pump 174, a water storage tank 175, water It consists of a feed pump 176.

The wet dust collector 171 collects dust contained in water vapor discharged from the heat exchanger 163 of the sludge drying unit 160. Here, the wet dust collector 171 sprays the washing water in two stages to increase dust collection efficiency to collect dust contained in the water vapor.

The wet deodorizer 172 deodorizes the odor discharged from the sludge drying unit 160 and the wet dust collector 171 and releases it to the atmosphere.

The washing water storage tank 173 is supplied with and stored with the time constant water, and discharges the sewage discharged from the dust collector to the manhole (not shown).

The washing water supply pump 174 supplies the washing water stored in the washing water storage tank 173 to the wet dust collector 171.

The water storage tank 175 is supplied with the time constant water and stored, and discharges the sewage discharged from the wet deodorizer 172 to the manhole.

The water supply pump 176 supplies the water stored in the water storage tank 175 to the wet deodorizer 172.

Hereinafter, the sewage sludge treatment method using electric dehydration and microwaves and hot air according to the present invention will be described in detail with reference to the accompanying drawings.

6 is a process chart for explaining the sewage sludge treatment method using the electric dehydration and microwave and hot air according to the present invention.

Referring to FIG. 6, when sewage sludge and polymer are introduced into the mixing tank 110, the mixing tank 110 mixes them and converts them into a gel state and discharges them (S100-mixing process).

When the sewage sludge in the gel state is introduced into the belt press 120 from the mixing tank 110, the belt press 120 dewaters it and discharges the sludge cake SC (S110-dehydration process). At this time, the water content of the sludge cake (SC) maintains about 80%.

Subsequently, the sludge cake SC discharged from the belt press 120 is introduced into the electroosmotic dehydrator 140 through the primary transfer conveyor 130 (S120-1 primary transfer process).

Subsequently, the electroosmotic dehydrator 140 compresses and dehydrates the injected sludge cake SC at a high temperature state (S130-electroosmotic dehydration process). At this time, the water content of the sludge cake (SC) is maintained about 60%.

The sludge cake SC discharged from the electrofiltration dehydrator 140 is transferred through the secondary transfer conveyor 150 and introduced into the dryer 161 of the sludge drying unit 160 (S140-2nd transfer process).

Then, the dryer 161 of the sludge drying unit 160 is microwaves while sequentially transporting the sludge cake (SC) through the conveyor (161a) while maintaining the high temperature state by the hot air generated from the hot air blower 162. Microwaves generated from the generator 161b are irradiated to dry the sludge cake SC, and then transferred to the hopper 166 through the export conveyor 165 and stored (S150-drying process). At this time, the water content of the sludge cake (SC) is maintained about 20 ~ 10%.

Meanwhile, the water vapor discharged from the heat exchanger 163 of the sludge drying unit 160 is supplied to the wet dust collector 171 of the deodorization unit 170, and after the dust is removed by the washing water, the water vapor is supplied to the wet deodorizer 172. Malodor is removed and released into the atmosphere (S160-deodorization process).

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

110: mixing tank 120: belt press
130: first conveying conveyor 140: electric penetration dehydrator
150: secondary conveying conveyor 160: sludge drying unit
170: deodorization unit SC: sludge cake

Claims (8)

A mixing tank that receives sewage sludge and a polymer and mixes them;
A belt press for dewatering sewage sludge discharged from the mixing tank;
A primary transport conveyor for transporting the sludge cake discharged from the belt press;
An electric permeation dehydrator for compressing and dehydrating the sludge cake introduced from the primary transport conveyor at a high temperature;
A secondary transport conveyor for transporting the sludge cake discharged from the electroosmotic dehydrator;
A dryer for irradiating microwaves to the sludge cake introduced from the secondary conveying conveyor, a hot air for supplying hot air to the dryer, and a heat exchanger for exchanging heat of steam discharged from the dryer to the hot air. And a blower installed between the hot air blower and the heat exchanger to supply combustion air to the hot air blower, an export conveyor for discharging the sludge cake discharged from the dryer, and a hopper for storing the sludge cake discharged from the discharge conveyor. Sludge drying unit; And
Electrical dehydration and sewage sludge treatment apparatus using microwave and hot air, characterized in that the deodorization unit for deodorizing the water vapor and odor discharged from the heat exchanger of the electrical penetration dehydrator and the sludge drying unit to release to the atmosphere. The method of claim 1,
Waste water discharged from the mixing tank, the belt press, and the electric penetration dehydrator,
Sewage sludge treatment apparatus using electric dehydration, microwaves and hot air, characterized in that discharged to the wastewater treatment plant. The method of claim 1,
The belt press and the electric penetration dehydrator,
Sewage sludge treatment apparatus using electric dehydration, microwaves and hot air characterized in that the water supply is supplied to wash the belt press, and to cool the electric penetration dehydrator. delete The method of claim 1,
The dryer,
Sewage sludge treatment apparatus using electric dehydration, microwave and hot air, characterized in that the installation alone or a plurality of parallel connection. The method of claim 5, wherein
When a plurality of dryers are installed, a third type conveying conveyor having a screw type is installed at the front end of the dryer to distribute and supply the sludge cake to each dryer, and the sewage sludge treatment apparatus using microwave and hot air. . The method of claim 1,
The deodorizing unit,
A wet dust collector for collecting dust contained in water vapor discharged from the heat exchanger of the sludge drying unit;
A wet deodorizer for deodorizing the odor discharged from the sludge drying unit and the wet dust collector and discharging it into the atmosphere;
A washing water storage tank for supplying and storing time constant and discharging the sewage discharged from the dust collector to a manhole;
A washing water supply pump supplying the washing water stored in the washing water storage tank to the wet dust collector;
A water storage tank in which time constant water is supplied and stored, and discharges wastewater discharged from the wet deodorizer to a manhole; And
Sewage sludge treatment apparatus using electric dehydration, microwave and hot air, characterized in that the water supply pump for supplying the water stored in the water storage tank to the wet deodorizer. In the sewage sludge treatment method using the sewage sludge treatment apparatus using electric dehydration and microwave and hot air of claim 1,
A mixing step of mixing and discharging sewage sludge and polymer in the mixing tank;
A dewatering process of dewatering and discharging sewage sludge discharged from the mixing tank by a belt press;
A primary conveying process of conveying the sludge cake discharged from the belt press to a primary conveying conveyor;
An electropermeation dehydration process of compressing and dehydrating the sludge cake transferred from the primary transport conveyor to the electroosmotic dehydrator at a high temperature;
A second conveying process of conveying the sludge cake discharged from the electroosmotic dehydrator to a secondary conveying conveyor;
A drying step of drying the sludge cake transferred from the second conveying conveyor and introduced into the sludge drying unit using hot air and microwaves; And
The sewage sludge treatment method using electric dehydration, microwave and hot air, characterized in that the deodorization step of deodorizing the steam and odor generated in the secondary dehydration process and drying process to release to the atmosphere.

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