KR101778781B1 - System for recycling sludge and method for recycling sludge using the same - Google Patents

Abstract

One embodiment of the present invention is a sludge recycling system including a sludge storage unit, a solidifying agent storage unit, a premixing unit, a mixing curing unit, and an air supply unit, A downcar traveling along the pair of rails; A relative vehicle traveling along a pair of rails formed parallel to each other in the width direction on the upper portion of the lower rail; A drive motor installed at an upper portion of the relative vehicle and having a hood at a lower portion thereof; A driving shaft connected to a lower portion of the driving motor, and a paddle provided on a lower side of the driving shaft and rotating; A plurality of through holes formed on a lower surface and a side surface of the mixed curing unit, And a gas outlet disposed at an upper end of the mixed curing part, wherein the plurality of mixed curing parts are disposed in parallel to each other.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge recycling system and a sludge recycling method using the sludge recycling system.

The present invention relates to a sludge recycling system and a sludge recycling method using the sludge recycling system.

Generally, sludge means a substance which is precipitated and separated in the process of treating sewage and wastewater, and has a high water content and organic matter content, which is likely to be decayed and difficult to treat.

These sludges are treated by landfilling underground, dumping into the ocean, incineration, and composting. Among the methods of treating sludge, marine dumping and landfill are relatively inexpensive and relatively simple to apply, but they are prohibited internationally because they cause environmental pollution.

On the other hand, when the sludge is incinerated, excessive cost is required to equip it, and there is also a problem of environmental pollution such as secondary pollutants. In addition, there are various attempts to compost the sludge, but it is difficult to secure the use of the produced compost, so that a large amount of sludge can not be treated.

Accordingly, various apparatuses and methods have been developed for solidifying sludge and using the sludge as a cover material for a landfill.

However, in the conventional apparatus and method, a lot of manpower has to be input, and additional environmental pollution may occur due to odor or wastewater generated in the solidification process, and excessive amount of solidifying agent is required to solidify the sludge, Lt; / RTI >

In addition, when the piping connecting the sludge and the solidifying agent is made by independent facilities, curing, and transferring processes are complicated, and when any one of the facilities is stopped due to malfunction, breakage, or the like, Not only the driving is interrupted but also the curing process can not be driven for a long time and the quality of the solidified product is uneven.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a method and apparatus for controlling odor and reducing the amount of solidifying agent, And to provide a sludge recycling system capable of producing solid cargo of uniform quality.

According to an aspect of the present invention, there is provided a sludge recycling system including a sludge storage unit, a solidifying agent storage unit, a premixing unit, a mixing curing unit, and an air supply unit, A lower rail running along a pair of rails formed parallel to each other in the longitudinal direction; A relative vehicle traveling along a pair of rails formed parallel to each other in the width direction on the upper portion of the lower rail; A drive motor installed at an upper portion of the relative vehicle and having a hood at a lower portion thereof; A driving shaft connected to a lower portion of the driving motor, and a paddle provided on a lower side of the driving shaft and rotating; A plurality of through holes formed on a lower surface and a side surface of the mixed curing unit, And a gas outlet disposed at an upper end of the mixed curing part, wherein the plurality of mixed curing parts are disposed in parallel to each other.

In one embodiment, the paddles may be provided on both lower sides of the drive shaft in pairs.

In one embodiment, the pair of paddles may be staggered.

In one embodiment, the drive motor may be capable of bi-directional rotation.

In one embodiment, the rotational speed of the paddles may be 100 to 200 rpm.

In one embodiment, the sludge recycling system may further include a shielding wall surrounding the plurality of mixed curing parts.

In one embodiment, the shielding wall may be made of fiber reinforced plastic (FRP).

According to another aspect of the present invention, there is provided a sludge recycling system comprising: (a) mixing a sludge and a solidifying agent to prepare a preliminary mixture; (b) introducing the preliminary mixture into the mixed curing part and mixing and curing the preliminary mixture while supplying air to produce a solidified product; And (c) discharging the gas to the outside of the mixed curing unit.

In one embodiment, the amount of the solidifying agent to be mixed in the step (a) may be 30 to 45 parts by weight based on 100 parts by weight of the sludge.

In one embodiment, step (b) may be performed at intervals of 1 hour to 3 hours.

In one embodiment, step (b) may be performed for 2 to 4 days.

According to one aspect of the present invention, by increasing the frequency of air contact between the sludge and the solidifying agent mixture by rotation of the paddle in the mixing and curing process, it is possible to improve the water reducing effect and produce a solid product of uniform quality, Accordingly, the amount of solidifying agent can be greatly reduced.

In addition, the mixing, curing, and transferring processes are carried out in one facility, thereby simplifying the entire process, enabling intensive management of facilities, and enhancing convenience in terms of maintenance.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a conceptual diagram of a sludge recycling system according to an embodiment of the present invention.
2 is a perspective view of a mixed curing part according to an embodiment of the present invention.
3 is a front view of the mixed curing part according to one embodiment of the present invention.
4 is a side view of a mixed curing part according to an embodiment of the present invention.
5 is a schematic view of a method for recycling sludge according to an embodiment of the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

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

Sludge  Recycling system

1 is a conceptual diagram of a sludge recycling system according to an embodiment of the present invention. FIGS. 2 to 4 are a perspective view, a front view, and a side view, respectively, of a mixed curing part according to an embodiment of the present invention.

1 to 4, a sludge recycling system according to an aspect of the present invention includes a sludge storage unit 100, a solidifying agent storage unit 200, a premixing unit 300, a mixed curing unit 400, The sludge recycling system according to any one of claims 1 to 4, further comprising: a lower cradle (410) running along a pair of rails (401) formed in parallel to each other in the longitudinal direction on the mixed cradle (400); A relative vehicle 420 traveling along a pair of rails 412 formed in parallel to each other in the width direction on the lower rail 410; A driving motor 430 installed on the upper portion of the relative vehicle 420 and having a hood 433 formed at a lower portion thereof; A driving shaft 431 connected to the lower portion of the driving motor 430 and a paddle 432 provided on a lower side surface of the driving shaft 431; A plurality of through holes (402) formed on a lower surface and a side surface of the mixing cure unit (400) connected to the air supply unit (500); And a gas discharge port 440 installed at the upper end of the mixed curing part 400. The plurality of mixed curing parts 400 may be installed in parallel with each other.

The sludge may be a functional sludge containing a certain amount of water, specifically, about 80% by weight of water, and examples thereof include domestic sewage, industrial wastewater, animal manure, and food sludge. It is not.

Since the solidifying agent has a function of absorbing heat and absorbing moisture when reacted with the sludge containing water, it can not only reduce the moisture content of the sludge but also re-sludge the treated sludge solidification .

Specifically, the solidifying agent may be any one selected from the group consisting of paper milled materials, quicklime, light dolomite, cement, biomass softening material, sewage sludge incineration ash, inorganic sludge dried material, and combinations of two or more thereof, but is not limited thereto .

Since the solidifying agent may have a problem of quality deterioration due to premixing depending on the type of the component, the solidifying agent storage unit 200 may include a plurality of independent storage units Lt; / RTI >

The sludge storage part 100 and the solidifying agent storage part 200 are provided on the line connected to the premixing part 300 so as to supply a predetermined amount of solidifying agent and sludge to the premixing part 300, (Not shown) may be provided.

In the premixer 300, the premix may be prepared by premixing the sludge and the solidifying agent in the mixed curing unit 400 before the mixture is introduced. Accordingly, the preliminary mixture is introduced into the mixed curing part 400 and mixed again, and at the same time, the curing process is performed, so that the solidification efficiency, that is, the water content reduction efficiency of the sludge can be improved.

An inlet (not shown) connected to the premixing unit 300 may be provided upstream of the mixed curing unit 400. When a certain amount of the premixture is introduced through the inlet, the lower car 410, The driving motor 420, the driving motor 430, and the paddle 432 may be driven to mix and cure the premixture.

Concretely, the lower cage 410 can reciprocate in the longitudinal direction along a pair of rails 401 formed parallel to each other on the upper part of the mixed curing part 400, and the upper part of the lower cage 410 The relative difference 420 can be reciprocated in the width direction along a pair of rails 412 formed in parallel to each other.

That is, the lower vehicle 410 and the opposite vehicle 420 can reciprocate in the vertical direction, and the driving motor 430 can be moved in a zigzag form on the basis of one round trip of the lower vehicle 410 You can drive.

In order to improve the driving performance by reducing the friction when the lower vehicle 410 and the relative vehicle 420 are running, a pair of rails, which are respective traveling paths, are provided on the lower or the side of the lower vehicle 410 and the relative vehicle 420, A pair of wheels 411 and 421 contacting the wheels 401 and 412 may be provided.

At this time, the driving motor 430 provides power to the driving shaft 431 so that the paddle 432 coupled to the driving shaft 431 rotates, and the preliminary mixture of the sludge accumulated in the mixed curing part 400 and the solidifying agent And the sludge can be solidified by mixing.

The mixture of the sludge and the solidifying agent is thrown upward and backward of the paddle 432 by the rotational force of the paddle 432 rotating from the lower part of the mixed curing part 400 in the running direction of the lower car 410 Not only can the sludge solidification efficiency be improved by bringing the sludge into contact with the air, but also the respective mixture particles can uniformly contact with the air, so that the quality of the solidified product can be made uniform.

At this time, the rotational speed of the paddle 432 may be 100 to 200 rpm, preferably 120 rpm. If the rotational speed of the paddle 432 is less than 100 rpm, the air contact frequency of the mixture relatively decreases, and the effect of reducing the water content due to curing may not be realized sufficiently. If the rotational speed of the paddle 432 is more than 200 rpm, , The surrounding environment, and the like.

Further, by throwing the mixture above and behind the paddle 432, the frequency of contact with air is increased compared with the conventional curing process, so that the amount of the solidifying agent can be reduced, thereby reducing the cost of raw materials.

As used herein, the term " curing " refers to the process of forming a solidified product by reducing the water content of the sludge by bringing the sludge mixed with the solidifying agent into contact with air, It can be used as a cover material such as a landfill.

Meanwhile, the paddles 432 may be provided on both lower sides of the driving shaft 431 in order to improve mixing and curing efficiency. That is, compared to the case where the paddles 432 are provided as a pair, the amount of mixture to be contacted per rotation of the paddle is doubled, so that mixing and curing efficiency can be improved.

When the pair of paddles 432 are provided symmetrically with each other, a non-contact surface between the paddle 432 and the preliminary mixture accumulated in the mixed curing portion 400 is generated when the driving motor 430 travels And the mixing and curing efficiency may be lowered. Accordingly, the pair of paddles 432 are provided to be shifted from each other (not shown) to minimize the non-contact surface, thereby improving the mixing and curing efficiency.

That is, the contact and non-contact surfaces that may occur as one of the pair of paddles 432 travels can be contacted by the other paddle staggered with the one paddle, thereby improving mixing and curing efficiency.

In order to further improve the mixing and curing efficiency, the driving motor 430 may be bi-directionally rotatable. The rotation direction of the paddle 432 may be changed as the driving motor 430 changes its direction of rotation so that the direction of rotation of the paddle 432 during the reciprocating travel of the lower vehicle 410 may be reversed .

That is, when the lower carriage 410 travels downstream in the upstream direction of the mixed curing part 400, the driving motor 430 moves the paddle 432 from the lower part of the mixed curing part 400 in the upstream direction And when the lower carriage 410 travels in the upstream direction downstream of the mixed curing portion 400, the rotation direction is reversely changed, and mixing and curing are repeated to increase the efficiency further .

Meanwhile, a hood 433 for preventing scattering of the mixture to be thrown above and behind the paddle 432 may be formed in the lower part of the relative car 420. Accordingly, the hood 433 may be a primary means for protecting a worker, a nearby environment, and the like from harmful substances that may occur during driving the mixed curing unit 400. The hood 433 may be formed around the lower end surface of the driving motor 430. However, the present invention is not limited thereto.

A plurality of through holes 402 connected to the air supply unit 500 may be formed on a lower surface and a side surface of the mixed curing unit 400 to increase the contact frequency between the mixture and air. That is, air can be infiltrated into the mixture particles to improve the solidification efficiency of the sludge, and it is possible to further improve the solidification efficiency according to the increased air contact frequency as compared with the case where the through holes are formed only on the lower surface or the side surface of the mixed curing part 400 Lt; / RTI >

During the mixing and curing process, ammonia (NH ₃ ) or the like, which generates an odor, is generated in an excessive amount, thereby hindering the working environment. In order to prevent this, a gas outlet 440 for discharging the gas may be formed at the upper end of the mixed curing part 400.

The gas discharged through the gas outlet 440 may be collected by a malodor removing unit (not shown) interlocked with the outside of the mixed curing unit 400, and treated with sulfuric acid or the like to be cleaned or deodorized.

As a result, the gas content of ammonia and the like in the solidified product finally formed by mixing and curing can be greatly reduced. Specifically, when the solidified material is used as a cover material, ammonia gas is contained in the solidified material at 70 ppm or less, so that occurrence of odor can be remarkably reduced.

When the curing of the sludge in the mixed curing unit 400 is completed and the solidified material is formed, the mixed curing unit 400 may be discharged through an outlet (not shown) provided downstream of the mixed curing unit 400. At this time, as the driving motor 430 changes the direction of rotation, the rotation direction of the paddle 432 is changed to discharge the solidified material out of the outlet.

That is, the driving motor 430 and the paddle 432 mix and cure the sludge according to the rotation direction of the sludge to form a solidified product, and transfer the solidified product to the outside of the mixed curing part 400 Can be performed simultaneously. Accordingly, the process can be simplified and the process efficiency can be improved as compared with the conventional sludge recycling system in which the mixing, curing, and transferring processes are performed by separate facilities.

In addition, the lower carriage 410, the relative carriage 420, and the driving motor 430 may include one or more control units (not shown) connected thereto to implement automation of the process. The control unit may include a plurality of control units for controlling the lower vehicle 410, the relative vehicle 420, and the driving motor 430, and may be configured to control all of them according to a central control method.

This series of processes can be repeated until the sludge exhibits a moisture content that can be used as a soil material, specifically, a water content of about 45%, thereby producing a solid material of uniform quality as compared with a conventional sludge recycling system. Also, the introduction and discharge of the sludge and the solidifying agent into the inlet and the outlet of the mixed curing unit 400 can be continuously performed, thereby improving the overall process efficiency.

Furthermore, a plurality of the mixing curing portions 400 are provided, and they are installed in parallel to each other to produce a large amount of solidified material. This may be suitable for a large-scale process for producing the solidified product, and if the driving of the mixed curing part is stopped due to malfunction, breakage, or the like, it may mean that the remaining mixed curing part can be operated without being affected.

Meanwhile, the sludge recycling system may further include a shielding wall (not shown) surrounding the plurality of mixed curing parts 400 as a secondary means for more effectively preventing the mixture from scattering to the outside.

The hood 433 prevents scattering of the mixture out of each mixed curing part 400 while the shielding wall functions to prevent scattering of the mixture out of the plurality of mixed curing parts 400 . Specifically, the shielding wall may be made of fiber reinforced plastic (FRP).

The term " fiber reinforced plastic (FRP) " as used herein means a plastic composite material reinforced with glass and carbon fibers, and is a high performance and high-functional material excellent in light weight, corrosion resistance, moldability and the like. When the shielding wall is formed of a fiber-reinforced plastic material, it is possible to realize an excellent lifetime characteristic as compared with other materials, thereby increasing the replacement cycle and improving the economical efficiency.

The solidified product produced in the mixed curing unit 400 may be transferred to the solidified product storage unit 600 interlocked with the outside of the mixed cured product 400. The solidified product stored in the solidified product storage unit 600 may be packed It can be completed as final product.

Sludge  How to recycle

FIG. 5 illustrates a sludge recycling method according to an embodiment of the present invention. According to another aspect of the present invention, there is provided a sludge recycling method using the sludge recycling system, comprising the steps of: (a) mixing a sludge and a solidifying agent to prepare a preliminary mixture; (b) introducing the preliminary mixture into the mixed curing part and mixing and curing the preliminary mixture while supplying air to produce a solidified product; And (c) discharging the gas to the outside of the mixed curing part. The above-mentioned sludge recycling system, in particular, the driving principle of the mixed curing section, is as described above.

The step (a) is a step of preparing a preliminary mixture by pre-mixing the sludge and the solidifying agent before the mixture is introduced into the mixed curing part, wherein the preliminary mixture of the sludge and the solidifying agent is prepared in the preliminary mixing part of the sludge recycling system .

At this time, the sludge and the solidifying agent may be fed into the premixing unit at one time or sequentially. Also, in the case of sequentially injecting the sludge, the sludge may be injected first, and the solidifying agent may be injected first.

The amount of the solidifying agent mixed in the step (a) may be 30 to 45 parts by weight, preferably 35 to 40 parts by weight based on 100 parts by weight of the sludge by using the sludge recycling system. If the content of the solidifying agent is less than 30 parts by weight based on 100 parts by weight of the sludge, the amount of the solidifying agent for reacting with the sludge may be insufficient to lower the solidification efficiency of the sludge. If the amount is more than 45 parts by weight, The unreacted solidifying agent may remain and the economical efficiency may be lowered.

In the step (b), the premix prepared in the step (a) is injected into the mixed curing part, and the mixed mixture is injected into the mixed curing part from the air injecting part through a plurality of through- The air can be injected and the pre-mixture can be mixed and cured simultaneously by driving the undercarriage, the relative car, the driving motor, and the paddle.

At this time, the step (b) may be performed for one hour to three hours, preferably two hours apart. If the step (b) is carried out at a time interval of less than one hour, malfunction due to overheating may occur in the mixed curing part. If the step (b) is performed at a time interval exceeding 3 hours, the air contact frequency of the mixture of the sludge and the solidifying agent And the mixing and curing efficiency may be lowered.

Also, the step (b) may be carried out for 2 to 4 days. The period of 2 days to 4 days means the time taken for the premix introduced into the front end of the mixed curing part to move to the rear end, that is, the residence time.

If the step (b) is carried out for less than 2 days, the curing time of the mixture is relatively short and the effect of reducing the water content of the sludge may be insignificant. If the curing time is more than 4 days, the water content Additional processing may be performed on the cargo that is unnecessary, resulting in energy loss.

In addition, when the premix is continuously introduced into the front end of the mixed curing section which is empty, the premix introduced first may be cured for 2 to 4 days and then discharged at the rear end of the mixed curing section. Subsequently, Curing for the same period of time and solidifying and discharging continuously, the recycling method may be performed continuously. Such a continuous recycling method can significantly improve the sludge treatment efficiency compared to the conventional discontinuous method, for example, the batch method.

In the step (c), ammonia gas or the like, which is generated excessively in accordance with the mixing and curing process of the step (b), may be removed to protect the operator, the nearby environment, and the like. At this time, as described above, it can be trapped and removed by a malodor removing apparatus interlocked with the outside of the mixed curing part.

The mixing and curing are completed in the step (b), and the solidified material from which the gas is removed in the step (c) finally shows a water content of about 45%, and can be used as a landfill material such as a landfill.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: sludge storage part
200: solidifying agent storage part
300:
400: mixed curing part
401: Rail
402: through hole
410: Lower car
411: Wheels
412: rail
420: Relative car
421: Wheels
430: drive motor
431: drive shaft
432: paddle
433: Hood
440: gas outlet
500: air supply part
600: high cargo storage section

Claims (11)

A sludge recycling system comprising a sludge storage, a solidifying agent storage, a premixing part, a mixing curing part, and an air supply part,
A lower crawler running along a pair of rails formed parallel to each other in the longitudinal direction on the upper part of the mixed curing part;
A relative vehicle traveling along a pair of rails formed parallel to each other in the width direction on the upper portion of the lower rail;
A drive motor installed at an upper portion of the relative vehicle and having a hood at a lower portion thereof;
A driving shaft connected to a lower portion of the driving motor, and a pair of upper and lower side surfaces of the driving shaft. The driving shaft rotates at a speed of 100 to 200 rpm and is moved in the longitudinal direction and the width direction by the lower and upper portions, A paddle for mixing, curing and transporting a mixture of pre-mixed sludge and solidifying agent;
A plurality of through holes formed on a lower surface and a side surface of the mixed curing unit, And
A plurality of mixed curing portions including a gas outlet provided at an upper end of the mixed curing portion;
Characterized in that the paddles are adapted to project the mixture above and behind the paddles.
delete delete The method according to claim 1,
Wherein the drive motor is bi-directionally rotatable.
delete The method according to claim 1,
Wherein the sludge recycling system further comprises a shielding wall surrounding the plurality of mixed curing parts.
The method according to claim 6,
Characterized in that the shielding wall is made of fiber reinforced plastic (FRP).
Use of the sludge recycling system of any one of claims 1, 4, 6, and 7,
(a) mixing the sludge and the solidifying agent to produce a premixture;
(b) introducing the preliminary mixture into the mixed curing part and mixing and curing the preliminary mixture while supplying air to produce a solidified product; And
(c) discharging the gas to the outside of the mixed curing part.
9. The method of claim 8,
Wherein the content of the solidifying agent mixed in the step (a) is 30 to 45 parts by weight based on 100 parts by weight of the sludge.
9. The method of claim 8,
Wherein the step (b) is performed at intervals of 1 to 3 hours.
11. The method of claim 10,
Wherein the step (b) is carried out for 2 to 4 days.

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