A device and method for solidifying a silt ground

Abstract

The application provides a sludge ground solidification device and method, which comprises a sludge solidification mixer, a solidifying agent storage chamber, a sludge suction pipeline and a sludge injection pipeline. One end of the sludge suction pipeline is in contact with the sludge under the ground, and the other end is connected to the sludge solidification mixer. A suction pump is arranged on the sludge suction pipeline. The solidifying agent storage chamber is connected to the sludge solidification mixer through a solidifying agent transmission pipeline. A transmission pump is arranged on the solidifying agent transmission pipeline. The sludge solidification mixer is used for stirring the suctioned sludge and the solidifying agent to generate sludge to be solidified. One end of the sludge injection pipeline is connected to the sludge solidification mixer, and the other end is in contact with the sludge under the ground. An injection pump is arranged on the sludge injection pipeline, which is used for injecting the sludge to be solidified into the settlement space under the ground to realize the rapid filling and hardening of the sludge to be solidified. The application can rapidly solidify the sludge under the ground and form permanent hard soil material.

Description

Technical Field

[0001] This application relates to the technical field, and in particular to a device and method for solidifying silt foundations. Background Technology

[0002] With the rapid development of engineering construction, the demand for land has increased dramatically, and the contradiction between construction and land demand and land shortage has become increasingly prominent. To address the land shortage problem, a large number of land reclamation projects have emerged in coastal areas, and such projects and artificial island projects will continue to appear in the future. During the land reclamation process, a large amount of soft soil foundations, such as silt, are created. Traditional treatment of silt mostly uses the replacement method, which involves removing the soft soil within the roadbed area. Therefore, the replacement method is only suitable for reinforcing shallowly buried silt and is not suitable for replacing thick layers of silt. At the same time, since replacement requires first cleaning the silt and then backfilling with stable soil or rocks and compacting or tamping it, it requires a lot of resources. Therefore, the replacement method also has the problems of high cost and long construction period.

[0003] Existing technologies can also treat silt soil through in-situ solidification. However, existing in-situ solidification foundation structures for silt and soft soil foundations are inconvenient for draining water from the soft soil foundation during use, and the solidification effect on the soft soil foundation is not good. Installation and construction are also relatively inconvenient. Summary of the Invention

[0004] In view of this, this application proposes a silt foundation solidification device and method, which involves pumping silt from underground into a mixer, adding soil or silt solidification agent for mixing, and then re-injecting it into the foundation, so that the silt under the foundation can be quickly solidified to form a permanent hard soil material that can withstand a certain weight load.

[0005] In a first aspect, this application provides a silt foundation solidification device, comprising: a silt solidification mixer, a solidifying agent storage chamber, a silt suction pipe, and a silt injection pipe;

[0006] One end of the sludge suction pipe is in contact with the sludge under the foundation, and the other end is connected to the sludge solidification mixer. The sludge suction pipe is equipped with a suction pump for suctioning the sludge under the foundation and transporting it into the sludge solidification mixer.

[0007] The curing agent storage chamber is connected to the sludge solidification mixer via a curing agent transmission pipeline. The curing agent transmission pipeline is equipped with a transmission pump for transmitting a set amount of curing agent into the sludge solidification mixer.

[0008] The sludge solidification mixer is used to filter and neutralize the pumped sludge, remove harmful substances and elements, and then mix it with a solidifying agent to generate sludge to be solidified.

[0009] One end of the sludge injection pipe is connected to the sludge solidification mixer, and the other end is in contact with the sludge under the foundation. The sludge injection pipe is equipped with an injection pump, which is used to inject the sludge to be solidified into the settlement space under the foundation to achieve rapid filling and hardening of the sludge to be solidified.

[0010] Therefore, this application provides a silt foundation solidification device. Utilizing the fluidity of silt, a suction pump and silt suction pipe are used to draw silt from under the foundation and transport it to a silt solidification mixer. A solidifying agent is added to the mixer through a solidifying agent delivery pipe. The mixer then filters and neutralizes the drawn silt, removing harmful substances and elements. After thorough mixing with the solidifying agent, silt to be solidified is generated and injected into the settlement space under the foundation through an injection pump and silt injection pipe. This achieves rapid filling and hardening of the silt, thereby rapidly solidifying the silt under the foundation, preventing silt foundation settlement, and solving the settlement problem of building foundations and reclaimed land on silt-covered tidal flats.

[0011] Optionally, a control center is also included, which is communicatively connected to the sludge solidification mixer, suction pump, transfer pump and injection pump respectively;

[0012] The control center is used to control the speed at which the suction pump draws sludge and the injection pump injects sludge according to the mixing ratio; the control center is also used to control the amount of curing agent transferred by the transfer pump according to the volume of the sludge drawn and the curing speed, and to control the sludge curing agitator to stir the drawn sludge and curing agent.

[0013] Therefore, the sludge solidification process can be automated through the control center, avoiding equipment damage or poor solidification effect caused by human error.

[0014] Optionally, the lower end of the sludge solidification mixer is also equipped with a heater for heating during the mixing process and for discharging the generated water.

[0015] As mentioned above, the temperature during the curing process has a certain impact on the curing speed and hardness of sludge. Usually, heating and stirring are carried out during the stirring process of the sludge curing mixer. The temperature depends on the type of curing agent, the composition of sludge, and the water content of sludge. The sludge to be cured at high temperature needs to be cooled and the water released during the curing process. In order to promote the effective curing of sludge, the temperature of the cured sludge should be monitored at the same time, and the water should be extracted and discharged in time, which is conducive to improving the curing speed and quality.

[0016] Optionally, holes are drilled in the foundation surface so that the sludge suction pipe and the sludge injection pipe extend into the lower part of the foundation and come into contact with the sludge under the foundation.

[0017] By configuring the number and location of foundation boreholes, the foundation surface does not collapse during the sludge suction and injection processes, while simultaneously meeting the mixing capacity of the sludge solidification mixer.

[0018] Therefore, holes are drilled on the foundation surface for sludge extraction and injection without compromising the foundation's service function. A reasonable ratio of the total flow rate of the sludge extraction holes to the total flow rate of the sludge injection holes is required. Several holes are drilled into the ground from the foundation or ground surface without compromising the foundation's support function. These holes are used to pump the sludge out into the sludge solidification mixer, while other holes are used to inject the sludge to be solidified back into the settlement space under the foundation. The diameter and flow rate of the holes should be large enough to meet the requirements of rapid extraction and injection of large flow rates of sludge, thereby achieving rapid filling and hardening of the sludge to be solidified.

[0019] Optionally, a flow meter is installed on the sludge suction pipe to monitor the flow rate of sludge suction; a flow meter is installed on the curing agent transmission pipe to monitor the flow rate of curing agent transmission; and a flow meter is installed on the sludge injection pipe to monitor the flow rate of sludge injection.

[0020] Therefore, the sludge suction flow rate and the injection flow rate into the settling space must be kept in dynamic balance. By monitoring the suction port flow meter, injection port flow meter and solidifying agent delivery port flow meter of the sludge solidification mixer, it is ensured that the mixture in the sludge solidification mixer is neither overflowing nor empty, and at the same time, it is ensured that the foundation settling space is filled with sludge to be solidified.

[0021] Optionally, the pumping pressure of the suction pump, transfer pump, and injection pump can be dynamically adjusted according to the stirring speed of the sludge solidification mixer.

[0022] As described above, the pressure variables of the sludge suction and injection pumps are adjustable. The pump output pressure range must not only be large enough, but also dynamically adjust the suction flow rate and injection flow rate in a timely manner based on the measurement results of the flow meter. This ensures that there is always sludge for mixing inside the sludge solidification mixer, and that there is sufficient capacity to fill the foundation settlement space, thus forming a dynamic balance adjustment of the sludge storage in the sludge solidification mixer.

[0023] Secondly, this application provides a method for solidifying silt foundations, characterized in that it includes:

[0024] The silt under the foundation is sucked out by the suction pump on the silt suction pipe and transported to the silt solidification mixer.

[0025] The set amount of curing agent is transferred to the sludge curing mixer through the transfer pump on the curing agent transfer pipeline.

[0026] The sludge is filtered and neutralized by a sludge solidification mixer to remove harmful substances and elements, and then mixed with a solidifying agent to generate sludge to be solidified.

[0027] By using an injection pump on the sludge injection pipeline, the sludge to be solidified is injected into the settlement space under the foundation, thereby achieving rapid filling and hardening of the sludge.

[0028] Optional, also includes:

[0029] The sludge solidification mixer, suction pump, transfer pump, and injection pump are controlled separately through the control center;

[0030] The speed at which the suction pump draws sludge and the speed at which the injection pump injects sludge are controlled according to the mixing ratio.

[0031] Based on the volume of sludge being pumped and the solidification rate, the amount of solidifying agent being pumped is controlled, and the sludge solidification agitator is controlled to mix the pumped sludge and solidifying agent.

[0032] Optional, also includes:

[0033] During the mixing process of the sludge solidification mixer, the mixer is heated according to the set temperature, and the generated water is discharged.

[0034] Optional, also includes:

[0035] After the sludge solidification process is completed, the suction port and injection port of the sludge solidification agitator are closed. A softener or solvent is added to the sludge solidification agitator, and after stirring, the injection port is opened to discharge the dissolved and softened sludge to be solidified from the injection port.

[0036] These and other aspects of this application will become more apparent in the description of the following embodiments(s). Attached Figure Description

[0037] Figure 1 A schematic diagram of a silt foundation solidification device provided in an embodiment of this application;

[0038] Figure 2 A flowchart of a silt foundation solidification method provided in an embodiment of this application.

[0039] It should be understood that the dimensions and shapes of the block diagrams in the above structural diagrams are for reference only and should not constitute an exclusive interpretation of the embodiments of this application. The relative positions and inclusion relationships between the block diagrams presented in the structural diagrams are only schematic representations of the structural relationships between the block diagrams, and are not intended to limit the physical connection methods of the embodiments of this application. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings.

[0041] In view of the settlement problem of building foundations and land reclamation on silt beaches near the sea, this application provides a silt foundation solidification device and method. The silt is pumped from underground into a mixer, soil or silt solidification agent is added and stirred, and then reinjected into the foundation, so that the silt under the foundation is quickly solidified to form a permanent hard soil material that can withstand a certain weight load.

[0042] like Figure 1 As shown, this application provides a silt foundation solidification device, referring to... Figure 1 As shown, the device includes: a sludge solidification mixer 100, a solidifying agent storage chamber 200, a sludge suction pipe 301, a sludge injection pipe 401, and a control center 500.

[0043] The sludge suction pipe 301 has several sludge suction pipes at one end. By drilling holes in the cement foundation, these sludge suction pipes can contact the sludge under the foundation through a portion of the holes in the foundation. The other end of the sludge suction pipe 301 is connected to the sludge solidification mixer 100. The sludge suction pipe 301 is equipped with a flow meter 302 and a suction pump 303. The suction pump 303 is used to suction the sludge under the foundation and transport it into the sludge solidification mixer 100. The flow meter 302 is used to monitor the flow rate of the sludge suction pump 303.

[0044] The curing agent storage chamber 200 is connected to the sludge solidification agitator 100 through the curing agent transmission pipe 201. The curing agent transmission pipe 201 is equipped with a flow meter 202 and a transmission pump 203. The transmission pump 203 is used to transmit a set amount of curing agent into the sludge solidification agitator 100, and the flow meter 202 is used to monitor the flow rate of the curing agent transmitted by the transmission pump 203.

[0045] The sludge solidification mixer 100 is used to filter and neutralize the pumped sludge, remove harmful substances and elements, and then mix it with a solidifying agent to generate sludge to be solidified.

[0046] One end of the sludge injection pipe 401 is connected to the sludge solidification mixer 100, and the other end is provided with several sludge injection pipes. These several sludge injection pipes contact the sludge under the foundation through another part of the holes on the foundation. The sludge injection pipe 401 is equipped with a flow meter 402 and an injection pump 403. The injection pump 403 is used to inject the sludge to be solidified into the settlement space under the foundation to achieve rapid filling and hardening of the sludge to be solidified. The flow meter 402 is used to monitor the flow rate of the sludge injected by the injection pump 403.

[0047] The control center 500 is communicatively connected to the aforementioned sludge solidification mixer 100, flow meter 202, transfer pump 203, flow meter 302, suction pump 303, flow meter 402, and injection pump 403. The control center 500 collects the flow rate of the sludge being pumped (monitored by flow meter 302) and the flow rate of the injected sludge (monitored by flow meter 402), and controls the sludge pumping speed of suction pump 303 and the sludge injection speed of injection pump 403 based on the mixing ratio. The control center 500 also collects the flow rate of the solidifying agent (monitored by flow meter 202), and controls the amount of solidifying agent transferred by transfer pump 203 based on the volume of sludge being pumped and the solidification speed, and controls the sludge solidification mixer 100 to mix the pumped sludge and solidifying agent. This control center 100 enables automated control of the sludge solidification process, avoiding equipment damage or poor solidification results caused by human error.

[0048] It should be noted that the curing agent in this embodiment does not cause any pollution to the surrounding soil, silt, or seawater, and has good environmental performance. The ratio of the curing agent mixed with the silt depends on the volume of the silt to be cured and the curing speed. Different types and models of curing agents have different curing speeds. An optimal ratio needs to be determined based on the volume of the silt to be cured, the settling space to be filled, and the speed of silt extraction and filling. The composition and water content of the silt are also important factors affecting the curing speed and hardening degree, and need to be considered comprehensively. An automatic ratio control method should be adopted to achieve automatic ratio control, so as to ensure that the silt to be cured begins to cure within 12 to 48 hours.

[0049] In some embodiments, since the temperature of the curing process has a certain influence on the curing speed and hardness of the sludge, a heater 101 can also be provided at the lower end of the sludge curing mixer 100 to heat and stir during the stirring process of the sludge curing mixer 100. The temperature of the heater 101 depends on the type of curing agent, the composition of the sludge, and the moisture content of the sludge. The high-temperature sludge to be cured needs to be cooled and moisture released during the curing process. In order to promote the effective curing of the sludge, the temperature of the cured sludge should be monitored at the same time, and the moisture should be extracted and discharged in time, which is beneficial to improving the curing speed and quality.

[0050] In this embodiment, before drilling holes in the foundation, the location and depth of the holes need to be rationally configured, with the principle that the number and location of the holes should not affect the foundation support strength. If necessary, the heavy load on the foundation can be removed. The support strength should be checked before drilling. The drilling depth should be based on reaching the depth of the silt. Before drilling, the thickness of the cement foundation should be detected and confirmed using a ground-penetrating instrument or a cement ultrasonic thickness gauge. Then, holes are drilled on the foundation surface for silt extraction and injection without damaging the foundation's service function. A reasonable ratio of the total flow rate of the silt extraction holes to the total flow rate of the silt injection holes is required. Several holes are drilled from the foundation or ground surface into the ground. These holes are used to extract the silt using a suction pump into a silt solidification mixer. Other holes are used to inject the silt to be solidified back into the settlement space under the foundation. The diameter and flow rate of the holes should be large enough to meet the requirements of rapid extraction and injection of large flow rates of silt, achieving rapid filling and hardening of the silt to be solidified.

[0051] In this embodiment, the sludge suction flow rate and the injection flow rate into the settling space during the sludge solidification process must maintain a dynamic balance. This is achieved by monitoring the flow meters at the suction port, injection port, and solidifying agent delivery port of the sludge solidification mixer to ensure that the mixture inside the mixer does not overflow or become empty, while simultaneously ensuring that the foundation settling space is filled with sludge to be solidified. Furthermore, the pressure variables of the sludge suction pump and injection pump are adjustable. Their pump outlet pressure range must be sufficiently large, and the suction and injection flow rates must be dynamically adjusted based on the flow meter measurements to ensure that there is always sludge for mixing inside the sludge solidification mixer and sufficient capacity to fill the foundation settling space, thus achieving a dynamic balance in the sludge content within the mixer. Simultaneously, the sludge suction pump and injection pump must possess good wear resistance and anti-sludge clogging capabilities.

[0052] It should also be noted that the sludge to be solidified is prone to solidification in an air-exposed space, which can quickly clog the suction port and injection port of the mixer. The residual sludge solidifies on the inner wall of the mixer and the mixing head or rotor, affecting the normal use of the mixer in subsequent processes. Therefore, it is necessary to close the suction port and injection port of the sludge solidification mixer when the sludge solidification process is completed. After adding a softener or solvent into the sludge solidification mixer and stirring, the injection port is opened to discharge the dissolved and softened sludge to be solidified, thereby achieving the function of automatic cleaning and removal of residual sludge.

[0053] The silt foundation solidification device provided in this embodiment can be assembled in a mobile, modular manner, either as a whole or as components such as mixers, suction units, or injection units. It can be quickly assembled to meet the needs of road or rail transport, fulfilling hoisting requirements. It also features rapid module replacement for easy on-site maintenance and repair. Furthermore, the device can be powered by industrial electricity, mains power, or batteries to meet the engineering construction needs of silt solidification in various scenarios.

[0054] like Figure 2 As shown in the embodiments of this application, a method for solidifying silt foundations is also provided, the method comprising:

[0055] S10: The sludge under the foundation is sucked up by the suction pump on the sludge suction pipe and transported to the sludge solidification mixer.

[0056] S20: The set amount of curing agent is transferred to the sludge curing mixer through the transfer pump on the curing agent transfer pipeline;

[0057] S30: The sludge pumped out is filtered and neutralized by a sludge solidification mixer to remove harmful substances and elements, and then mixed with a solidifying agent to generate sludge to be solidified.

[0058] S40: The sludge to be solidified is injected into the settlement space under the foundation by the injection pump on the sludge injection pipeline, so as to achieve rapid filling and hardening of the sludge to be solidified.

[0059] It should be understood that the methods in the embodiments of this application can be implemented by software, for example, by a computer program or instructions having the above-described functions. The corresponding computer program or instructions can be stored in the internal memory of the terminal, and the processor reads the corresponding computer program or instructions from the memory to implement the above functions. Alternatively, the methods in the embodiments of this application can also be implemented by hardware. Or, the methods in the embodiments of this application can also be implemented by a combination of a processor and software modules.

[0060] It should be understood that the processing details of the methods in the embodiments of this application can be found by referring to... Figure 1 The descriptions of the embodiments and related extended embodiments shown will not be repeated in this application.

[0061] It should be noted that the embodiments described in this application are merely some embodiments, not all embodiments. The components of the embodiments of this application typically described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the above detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0062] The terms "first, second, third, etc." or similar terms such as module A, module B, module C, etc., used in the specification and claims are only used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that a specific order or sequence may be interchanged where permitted so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0063] In the above description, the labels indicating the steps do not necessarily mean that the steps will be executed. They may include intermediate steps or be replaced by other steps. Where permissible, the order of the steps may be interchanged or executed simultaneously.

[0064] The term "comprising" as used in the specification and claims should not be construed as limiting itself to what follows; it does not exclude other elements or steps. Therefore, it should be interpreted as specifying the presence of the mentioned feature, integral, step, or component, but does not exclude the presence or addition of one or more other features, integrals, steps, or components, or groups thereof. Thus, the statement "device comprising means A and B" should not be limited to a device consisting solely of components A and B.

[0065] The terms "an embodiment" or "an embodiment" as used in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in at least one embodiment of this application. Therefore, the terms "in one embodiment" or "in an embodiment" appearing throughout this specification do not necessarily refer to the same embodiment, but may refer to the same embodiment. Furthermore, in the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions between different embodiments are consistent and can be mutually referenced. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0066] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present application has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A silt foundation solidification device, characterized in that, include: Sludge solidification mixer, solidifying agent storage chamber, sludge suction pipe, sludge injection pipe; By drilling holes in the foundation surface, the sludge suction pipe and sludge injection pipe can be extended into the lower part of the foundation and come into contact with the sludge under the foundation. By configuring the number and location of foundation holes, the foundation surface does not collapse during the sludge suction and injection process, while simultaneously meeting the mixing capacity of the sludge solidification mixer; One end of the sludge suction pipe is in contact with the sludge under the foundation, and the other end is connected to the sludge solidification mixer. The sludge suction pipe is equipped with a suction pump for suctioning the sludge under the foundation and transporting it into the sludge solidification mixer. The curing agent storage chamber is connected to the sludge solidification mixer via a curing agent transmission pipeline. The curing agent transmission pipeline is equipped with a transmission pump for transmitting a set amount of curing agent into the sludge solidification mixer. The sludge solidification mixer is used to filter and neutralize the pumped sludge, remove harmful substances and elements, and then mix it with a solidifying agent to generate sludge to be solidified. One end of the sludge injection pipe is connected to the sludge solidification mixer, and the other end is in contact with the sludge under the foundation. The sludge injection pipe is equipped with an injection pump, which is used to inject the sludge to be solidified into the settlement space under the foundation to achieve rapid filling and hardening of the sludge to be solidified. It also includes a control center, which is communicatively connected to the sludge solidification mixer, suction pump, transfer pump, and injection pump. The control center is used to control the speed at which the suction pump sucks up sludge and the injection pump injects sludge according to the mixing ratio. The control center is also used to control the amount of solidifying agent transferred by the transfer pump according to the volume of sludge sucked up and the solidification speed, and to control the sludge solidification mixer to mix the sucked sludge and solidifying agent.

2. The apparatus according to claim 1, characterized in that, The lower end of the sludge solidification mixer is also equipped with a heater, which is used to heat the sludge during the mixing process and to discharge the generated water.

3. The apparatus according to claim 1, characterized in that, A flow meter is installed on the sludge suction pipe to monitor the flow rate of sludge suction; a flow meter is installed on the curing agent transmission pipe to monitor the flow rate of curing agent transmission; and a flow meter is installed on the sludge injection pipe to monitor the flow rate of sludge injection.

4. The apparatus according to claim 1, characterized in that, The pumping pressure of the suction pump, transfer pump, and injection pump is dynamically adjusted according to the stirring speed of the sludge solidification mixer.

5. A method for solidifying silt foundations, using the silt foundation solidification device described in any one of claims 1 to 4, characterized in that, include: By drilling holes in the foundation surface, the sludge suction pipe and sludge injection pipe can be extended into the lower part of the foundation and come into contact with the sludge under the foundation. By configuring the number and location of foundation holes, the foundation surface does not collapse during the sludge suction and injection process, while simultaneously meeting the mixing capacity of the sludge solidification mixer; The silt under the foundation is sucked out by the suction pump on the silt suction pipe and transported to the silt solidification mixer. The set amount of curing agent is transferred to the sludge curing mixer through the transfer pump on the curing agent transfer pipeline. The sludge is filtered and neutralized by a sludge solidification mixer to remove harmful substances and elements, and then mixed with a solidifying agent to generate sludge to be solidified. The sludge to be solidified is injected into the settlement space under the foundation by the injection pump on the sludge injection pipeline, so as to achieve rapid filling and hardening of the sludge to be solidified. The control center controls the sludge solidification mixer, suction pump, transfer pump, and injection pump respectively; according to the mixing ratio, the suction pump is controlled to suction the sludge and the injection pump is controlled to inject the sludge; according to the volume of sludge suctioned and the solidification speed, the transfer pump is controlled to transfer the amount of solidifying agent, and the sludge solidification mixer is controlled to mix the suctioned sludge and solidifying agent.

6. The method according to claim 5, characterized in that, Also includes: During the mixing process of the sludge solidification mixer, the mixer is heated according to the set temperature, and the generated water is discharged.

7. The method according to claim 5, characterized in that, Also includes: After the sludge solidification process is completed, the suction port and injection port of the sludge solidification mixer are closed. A softener is added to the sludge solidification mixer, and after stirring, the injection port is opened to discharge the softened sludge to be solidified.

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