CN110723878A - Electroosmosis-medicament vacuum preloading method - Google Patents
Electroosmosis-medicament vacuum preloading method Download PDFInfo
- Publication number
- CN110723878A CN110723878A CN201910961749.5A CN201910961749A CN110723878A CN 110723878 A CN110723878 A CN 110723878A CN 201910961749 A CN201910961749 A CN 201910961749A CN 110723878 A CN110723878 A CN 110723878A
- Authority
- CN
- China
- Prior art keywords
- electroosmosis
- vacuum preloading
- solid
- liquid separation
- vacuum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses an electroosmosis-medicament vacuum preloading method, which is characterized in that chemical medicaments are added into waste slurry, and the electroosmosis and vacuum preloading are combined to carry out solid-liquid separation on engineering waste slurry, and in the stage of the action of the electroosmosis and the vacuum preloading, the electroosmosis can effectively promote weak bound water in slurry to be discharged, so that the consolidation speed is accelerated, and large-scale, rapid and intensive waste slurry treatment can be realized. And the vacuum preloading can promote the consolidation of the mud near the cathode, the electroosmosis can promote the consolidation of the mud near the anode, and the vacuum preloading and the electroosmosis can effectively improve the strength of the mud near the cathode and the anode in combined action. The method combines the electroosmosis method, the medicament adding method and the vacuum preloading method to carry out rapid, efficient and intensive treatment on the slurry, has wide application prospect and good social benefit, and has important significance for environmental protection as a novel solid-liquid separation method for treating the slurry.
Description
Technical Field
The invention relates to a slurry treatment method, in particular to a solid-liquid separation treatment method of slurry, which is applied to the technical fields of waste solid-liquid mixture treatment methods and waste recycling.
Background
With the increasing underground engineering of underground continuous walls, shield tunnels, cast-in-situ bored piles and the like, more and more engineering waste mud is generated in the engineering construction process, and the waste mud generally has the following characteristics:
1) the clay has high content and strong dispersibility, and can be naturally placed in a short time or can be easily solidified by self weight all the time;
2) the water content is extremely high, generally about 160-300%, and the water content is in a flowing state for a long time, so that serious pollution is caused to a placing place.
Engineering waste slurry, referred to as "waste slurry" for short. At present, the conventional treatment methods of engineering waste slurry comprise four common treatment methods of direct outward transportation discharge, centrifugal filtration, mechanical filter pressing and vacuum filtration.
(1) The outward transportation and discharge is a treatment method for naturally drying the waste pulp by transporting the waste pulp to the outskirts. The method has high treatment efficiency, but if the soil is discharged to land, undisturbed soil is hardened and loses cultivation capacity, and if the soil is discharged to river channels and oceans, the water area where the soil is located is polluted;
(2) the effective treatment method for solid-liquid separation of waste slurry by using a vacuum filter press in vacuum filtration has the defects of low treatment efficiency and bottleneck in technical aspect because clogging is easily generated when the slurry with high clay content is treated.
(3) Centrifugal filtration is a method of filling slurry into a centrifugal pump, discharging liquid in the centrifugal pump rotating at a high speed and retaining solids, and has the disadvantage of low treatment efficiency;
(4) the mechanical filter pressing can separate solid particles from liquid in the waste slurry in a short time, and the mud cake generated after separation can be used as engineering materials, such as fired bricks, and has the defects of low treatment efficiency, large occupied space and unsuitability for treating the waste slurry in a construction site with limited space.
Of the above four disposal techniques, export discharge is often adopted at present, which is related to reasons such as poor environmental awareness of people, laggard appearance and technology of existing slurry disposal, and too high disposal cost of other methods. Such outward discharge means, which have been used for a long time, have been polluting the environment of the storage places such as the sea, the land, etc. or are about to face a potentially serious pollution threat, and this situation has been exacerbated in recent years. With the increasing awareness of environmental protection, the extensive slurry disposal is being questioned and objected, and the development of efficient and environment-friendly slurry disposal technology by technical personnel in the industry is urgently required.
Disclosure of Invention
In order to solve the problems of the prior art, the invention aims to overcome the defects in the prior art, provides an electroosmosis-medicament vacuum preloading method, can treat waste slurry in a large scale, quickly and intensively, combines three medicament vacuum electroosmosis methods together to realize the electroosmosis-medicament vacuum preloading method, adopts the electroosmosis method, the medicament adding method and the vacuum preloading method to combine to quickly, efficiently and intensively treat the slurry, has wide application prospect and good social benefit, and has important significance for environmental protection as a novel slurry treatment solid-liquid separation method.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electroosmosis-medicament vacuum preloading method combines the addition of chemical medicaments into waste slurry with electroosmosis and vacuum preloading to carry out solid-liquid separation treatment on the waste slurry, and comprises the following steps:
a. the first solid-liquid separation process: analyzing the characteristics of the waste slurry to be treated, determining the doping amount and proportion of chemical agents according to physical and chemical analysis, sequentially adding the chemical agents into a sedimentation tank filled with the waste slurry, fully and uniformly stirring and mixing the chemical agents by a stirrer, standing the mixture to enable solid particles in the waste slurry to naturally precipitate, taking samples from the sedimentation tank for analysis after the waste slurry is layered after standing for a certain time, and discharging upper liquid after indexes reach required values to finish the first solid-liquid separation process;
b. b, arranging a vacuum network drainage system in the vacuum solid-liquid separation tank according to design requirements while naturally precipitating the waste slurry in the step a;
c. the second step of solid-liquid separation process: after the first solid-liquid separation process in the step a is finished, pumping the precipitate into a solid-liquid separation pool with a vacuum network drainage system arranged in the step b by using a pump, wherein the pumping amount is determined according to the design requirement; then inserting steel bars into the sediments in the solid-liquid separation tank at equal intervals to serve as a cathode and an anode, and connecting the cathode of the electrode with a vertical drainage pipe; laying geotextile and a sealing film on the sediment according to requirements to form an air leakage prevention sealing structure in the solid-liquid separation tank; and the vertical drain pipe is connected with the header pipe, so that the connecting pipe of the header pipe is connected with the vacuum pump, the cathode and the anode of the electrode are connected with the direct current power supply through cables, the vacuum loading process is carried out after the device is arranged, a method of vacuumizing firstly and then combining with electroosmosis is adopted, vacuum preloading drainage is adopted at the initial stage of the solid-liquid separation process of the second step, and when the test soil body reaches the optimal critical water content, drainage is carried out by combining with the electroosmosis method, the concrete steps are as follows:
firstly, carrying out a vacuum preloading process, sampling and analyzing the property of the precipitate at intervals of a certain time according to requirements, and simultaneously acting on the precipitate by combining an electroosmosis method when the optimal critical water content is reached; then sampling at intervals to analyze the property of the precipitate, and stopping vacuum loading and electroosmosis when the property of the precipitate at least reaches the water content and strength indexes required by design so as to complete the solid-liquid separation process of the second step;
d. and c, after the solid-liquid separation process in the second step is finished in the step c, removing the vacuum network drainage system and the electroosmosis system, and conveying the precipitate in the solid-liquid separation tank to a required place by using a earthwork vehicle to finish the treatment.
As a preferred technical scheme of the invention, in the step a, before vacuum preloading, a corresponding chemical agent is added, wherein the chemical agent not only performs primary solid-liquid separation on the slurry, but also has the functions of increasing the particle size of soil particles in the slurry, forming a spatial structure and increasing the permeability of precipitates; in A, B, C, the agent A has the functions of adsorption, net-catching, electric neutralization and increasing the particle size of soil particles, the agent B has the function of enhancing the effect of the agent A, and the agent C has the functions of assisting filtration and improving efficiency in the vacuum preloading process.
In the step c, in the stage of performing the combined action of the vacuum preloading and the electroosmosis method, the electrodes and the plastic drainage plate are arranged in the same row, and the plastic drainage plate and the electrode cathode are connected together to realize the combined action.
4. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: in the step c, the main drainage pipe is a PVC pipe or a steel pipe; the horizontal drain pipe and the vertical drain pipe are made of soft or hard PVC pipes, corrugated filter pipes or plastic drain plates and are connected to form a three-dimensional drain channel, the soft permeable pipe is externally coated with a filter membrane, and each main drain pipe is converged to a drain connecting pipe and is connected with the vacuum pump.
In the step c, in the second solid-liquid separation process, the water is accelerated to be discharged by adopting a synchronous strengthening method or an asynchronous strengthening method in the action stage of vacuum preloading combined with the electroosmosis method.
In the step c, the polarity of the positive and negative electrodes is switched at a certain time interval in the stage of the action of the vacuum preloading and the electroosmosis method.
In the step c, the pH value of the cathode is increased in the stage of the action of the vacuum preloading and the electroosmosis method, so that the hydration dissociation reaction of substances in the soil body is promoted.
In the step a, the solid particles in the waste slurry are naturally precipitated, the waste slurry is layered after standing for a certain time, then the sample is taken from the sedimentation tank for analysis, when the index does not reach the required value, the standing treatment and the sampling analysis are continued until the index reaches the required value, the upper liquid is discharged, and the first solid-liquid separation process is completed.
In the step c, when the vacuum preloading is adopted for draining in the initial stage of the solid-liquid separation process in the second step, the property of the precipitate is sampled and analyzed, when the optimal critical water content is not reached, the vacuum preloading is continuously kept for draining, then the sampling analysis is continuously carried out, and when the optimal critical water content is reached, the precipitate is acted by combining the electroosmosis method.
As a preferred technical scheme of the invention, in the step c, in the stage of action of the vacuum preloading and the electroosmosis method, sampling is carried out to analyze the properties of the precipitate, when the water content or the strength index required by the design is not reached, the action of the vacuum preloading and the electroosmosis method is continuously maintained until the water content or the strength index required by the design is at least reached, the vacuum loading and the electroosmosis effect are stopped, and the second solid-liquid separation process is completed.
The principle of the invention is as follows:
under the condition that a direct current electric field exists, an adsorption layer of soil particles can be weaker, so that the compressibility of a soil body is reduced, and the directional movement of some ions enables the concentration change of the ions to promote the reaction between a chemical agent and the soil body, so that the soil body is reinforced. On the other hand, under the action of the electric field, the chemical agent and some physical and chemical reactions of the soil body are stronger, the reaction degree is larger, and the properties of the soil body are more stable and the strength is larger under certain conditions. After the electroosmosis and the chemical agent are combined, the pH value of the cathode is greatly increased, the hydration and dissociation of some substances in the soil body are promoted, and the solidification cohesion among the soil particles is increased, so that the strength of the soil body is improved.
Under the action of vacuum preloading, hydrogen and oxygen gathered at the electrode and generated by electrolysis and water vapor formed under the action of heat are more easily discharged, so that the contact area between the electrode and the soil body is increased, the interface resistance is reduced, and the discharge of water in the soil body in a gas form is further accelerated. Meanwhile, the electroosmosis method can improve the drainage rate of the vacuum preloading method. The chemical agent is added to prevent the clogging phenomenon of the filter membrane in the vacuum preloading method, and the solid-liquid separation efficiency of the vacuum preloading is greatly improved; the vacuum preloading method can quickly discharge most of free water in the soil body; the electroosmosis method can drain weak bound water in soil. Under the combined action of electroosmosis and vacuum preloading, the drainage speed can be effectively accelerated, the respective advantages can be exerted, and the consolidation of the soil body can be better promoted.
Therefore, the electroosmosis-medicament vacuum preloading method organically combines three methods, namely an electroosmosis method, a chemical medicament adding method and a vacuum preloading method, and the three methods are in a mutual promotion and supplement relationship. Firstly, adding proper types and quantities of chemical agents into waste slurry to reduce the water content of the waste slurry and form sediment with a certain skeleton structure, then applying vacuum load to the sediment for prepressing, reducing the water content of the sediment through loading for a period of time, then performing an electroosmosis combined vacuum prepressing stage to further reduce the water content, stopping the loading after the water content is reduced to a preset requirement, dismantling an electroosmosis system and a vacuum drainage system, and transporting the soil after solid-liquid separation to a required site.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. the method of the invention finds an effective and environment-friendly treatment way for the waste slurry, can greatly reduce the pollution caused by the discharge to the marine environment and the land environment, and reserves a larger living space for the offspring;
2. the soil separated by the method has lower water content and higher strength, and can be used as a raw material of building materials, such as bricks;
3. the soil separated by the method has lower water content and higher strength, and can be used for building sites needing to be backfilled to supplement the shortages of earthwork;
4. the method is directly combined with the land reclamation by the surrounding sea, the land reclamation needs earthwork, the treated mud needs to be removed, the two are mutually supplemented, and finally treated mud can be backfilled to the surrounding area; or directly backfilling the slurry treated by a certain medicament into the enclosed field, and then performing electroosmosis and vacuum preloading treatment to achieve the purposes of changing waste into valuable, saving the construction period and reducing the cost.
Drawings
FIG. 1 is a flow chart of the process of electro-osmosis-drug vacuum preloading method according to the embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a sedimentation tank in accordance with an embodiment of the present invention, in which electroosmotic agent is vacuum-precompressed.
FIG. 3 is a longitudinal sectional view of a solid-liquid separation tank in accordance with an embodiment of the present invention.
Fig. 4 is a top view of fig. 3.
Detailed Description
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
the first embodiment is as follows:
in this example, referring to fig. 1 to 4, 1 is a low-speed mixer, 2 is a foam board, 3 is an additive pumping pipe, 4 is a waste slurry pumping pipe, 5 is original waste slurry, 6 is a vacuum pump, 7 is a connecting pipe, 8 is a header pipe, 9 is a transverse drain pipe, 10 is a vertical drain pipe and a cathode, 11 is a geotextile, 12 is a geomembrane, 13 is a precipitate, 14 is an anode, and 15 is a direct current power supply, and a settling tank and a solid-liquid separation tank of an electroosmosis-medicament vacuum preloading method are formed. Engineering waste slurry samples are adopted on site, and a series of special physical and chemical properties of the water content, the particle composition, the mineral composition, the pH value and the specific gravity of the engineering waste slurry samples are measured and analyzed. And designing a waste slurry sedimentation tank, a solid-liquid separation tank and a pumping amount according to actual conditions of a construction site such as site size, manpower, mechanical shift, the amount of waste slurry to be treated and the like, as shown in figures 2-4. Arranging a sedimentation tank and a solid-liquid separation tank, connecting a low-speed stirrer 1 with a foam board 2, and pumping waste slurry 5 into the sedimentation tank to a certain height through a pumping pipe 4. A, B two chemical agents are adopted, the agent A has the functions of adsorption, net capture, electric neutralization and soil particle size increase, the agent B has the function of enhancing the agent A, the additive A, B is sequentially pumped into a sedimentation tank through a pumping pipe 3, and is stirred by a low-speed stirrer 1 according to the designed stirring speed, so that the waste slurry and the additive are fully and uniformly mixed. In the solid-liquid separation tank, a transverse drain pipe 9 and a vertical drain plate 10 are connected according to design requirements and are arranged in the separation tank, as shown in figures 3 and 4. Reinforcing steel bars are inserted into the sediment at equal intervals to serve as cathode and anode electrodes, and the cathode of the electrode is connected with a vertical drainage plate, as shown in figure 3. And (3) laying geotextile 11, sealing film 12 and the like on the sediment as required, connecting the drainage pipe with a main pipe 8, connecting the main pipe 8 with a vacuum pump 6 through a connecting pipe 7, and connecting the cathode and the anode of the electrode 10 and 14 with a direct current power supply 15 through cables to complete the arrangement of the device. The device of the embodiment adopts an electroosmosis-medicament vacuum preloading method to treat engineering waste slurry. In the embodiment, in a specific implementation, each parameter such as the distance and the length of the drain pipes in the drain network system, the distance and the placement form of the filter pipes and the main pipes, the distance and the insertion depth of the cathode and the anode, and the like, needs to be calculated, and is determined by combining engineering practical experience.
In this embodiment, referring to fig. 1-4, an electroosmosis-medicament vacuum preloading method combines the addition of chemical agents to the waste slurry with electroosmosis and vacuum preloading, and performs solid-liquid separation treatment on the waste slurry, including the following steps:
a. the first solid-liquid separation process: analyzing the characteristics of the waste slurry to be treated, determining the doping amount and the proportion of a chemical agent A, B according to physical and chemical analysis, then sequentially adding the chemical agents into a sedimentation tank filled with the waste slurry, fully stirring and uniformly mixing by adopting a stirrer, and then standing; naturally precipitating solid particles in the waste slurry, standing for a certain time for layering the waste slurry, sampling and analyzing the waste slurry from a sedimentation tank, and discharging upper liquid after the water content and particle distribution indexes reach required values to finish the first solid-liquid separation process; when the water content and the particle distribution index do not reach the required values, continuing to perform standing treatment and sampling analysis until the index reaches the required values, and discharging the upper liquid to finish the first solid-liquid separation process;
b. b, arranging a vacuum network drainage system in the vacuum solid-liquid separation tank according to design requirements while naturally precipitating the waste slurry in the step a;
c. the second step of solid-liquid separation process: after the first solid-liquid separation process in the step a is finished, pumping the precipitate into a solid-liquid separation pool with a vacuum network drainage system arranged in the step b by using a pump, wherein the pumping amount is determined according to the design requirement; then inserting steel bars into the sediments in the solid-liquid separation tank at equal intervals to serve as a cathode and an anode, and connecting the cathode of the electrode with a vertical drainage pipe; laying geotextile and a sealing film on the sediment according to requirements to form an air leakage prevention sealing structure in the solid-liquid separation tank; and the vertical drain pipe is connected with the header pipe, so that the connecting pipe of the header pipe is connected with the vacuum pump, the cathode and the anode of the electrode are connected with the direct current power supply through cables, the vacuum loading process is carried out after the device is arranged, a method of vacuumizing firstly and then combining with electroosmosis is adopted, vacuum preloading drainage is adopted at the initial stage of the solid-liquid separation process of the second step, and when the test soil body reaches the optimal critical water content, drainage is carried out by combining with the electroosmosis method, the concrete steps are as follows:
firstly, carrying out a vacuum preloading process, sampling and analyzing the property of the precipitate at intervals of a certain time according to requirements, and simultaneously acting on the precipitate by combining an electroosmosis method when the optimal critical water content is reached; then sampling at intervals to analyze the property of the precipitate, and stopping vacuum loading and electroosmosis when the property of the precipitate at least reaches the water content and strength indexes required by design so as to complete the solid-liquid separation process of the second step;
when the vacuum preloading is adopted for draining at the initial stage of the solid-liquid separation process in the second step, sampling and analyzing the property of the precipitate, when the optimal critical water content is not reached, continuing to maintain the vacuum preloading for draining, then continuing to perform sampling and analyzing until the optimal critical water content is reached, and simultaneously acting on the precipitate by combining an electroosmosis method;
in the action stage of the vacuum preloading and electroosmosis method, sampling and analyzing the property of the precipitate, when the water content or strength index of the design requirement is not reached, continuing to keep the action of the vacuum preloading and electroosmosis method until the water content or strength index of the design requirement is at least reached, stopping the vacuum loading and electroosmosis action, and completing the solid-liquid separation process of the second step;
by adopting the method of vacuumizing first and then electroosmosis, if electroosmosis is performed while vacuumizing, the electroosmosis current is large. Too high current can lead to accelerated anode corrosion and soil body dry cracking. Therefore, vacuum preloading drainage is adopted in the initial stage, and drainage is carried out by combining an electroosmosis method after the test soil body reaches the optimal critical water content;
d. and c, after the solid-liquid separation process in the second step is finished in the step c, removing the vacuum network drainage system and the electroosmosis system, and conveying the precipitate in the solid-liquid separation tank to a required place by using a earthwork vehicle to finish the treatment.
As shown in fig. 1-4, the vacuum preloading method for treating large-area dredging sludge, which is different from the conventional vacuum filter pressing method, has the characteristics of large treatment capacity and high treatment efficiency, can treat tens of thousands to hundreds of thousands of square of mud at one time, and is particularly suitable for intensive mud treatment. In the embodiment, a corresponding chemical agent is added before vacuum preloading, and the chemical agent not only performs primary solid-liquid separation on the slurry, but also has the effects of increasing the particle size of soil particles in the slurry, forming a spatial structure and increasing the permeability of sediments. The embodiment adopts an electroosmosis-medicament vacuum preloading method, has the function of preventing the clogging of the filter membrane coated outside the drain pipe in the vacuum preloading process, and can greatly improve the solid-liquid separation efficiency of the vacuum preloading. In the embodiment, at the stage of combining electroosmosis and vacuum preloading, electroosmosis can effectively promote weak bound water in slurry to be discharged, and the consolidation speed of the soil body is accelerated. The vacuum preloading can promote the consolidation of the mud near the cathode, the electroosmosis can promote the consolidation of the mud near the anode, and the strength of the mud near the cathode and the anode can be effectively improved when the vacuum preloading and the electroosmosis are combined. In the embodiment, under the action of the electric field, the chemical agent and some physical and chemical reactions of the soil body are stronger, the reaction degree is larger, the property of the soil body is more stable and the strength is larger under a certain condition, the pH value at the cathode is increased, and the hydration and dissociation of some substances in the soil body are promoted. In the method, under the action of vacuum load, hydrogen and oxygen generated by electrolysis and gathered at the electrode and water vapor formed under the action of heat are more easily discharged, so that the contact area between the electrode and the soil body is increased, the interface resistance is reduced, and the discharge of water in the soil body in a gas form is further accelerated. The implementation method adopts a method of vacuumizing first and then electroosmosis. If electroosmosis is performed while vacuum is applied, the electroosmotic current is large. Too high current can lead to accelerated anode corrosion and soil body dry cracking. Therefore, vacuum preloading drainage is adopted in the initial stage, and drainage is carried out by combining an electroosmosis method after the test soil body reaches the optimal critical water content. In the action stage of the vacuum preloading and the electroosmosis method, the water is accelerated to be discharged by adopting a synchronous reinforcing method or an asynchronous reinforcing method. Meanwhile, in order to prevent the corrosion of the cathode and the anode, the polarity of the cathode and the anode is switched at certain time intervals. The embodiment adopts a new method for solid-liquid separation by sludge treatment, and adopts the combination of an electroosmosis method, a medicament adding method and a vacuum preloading method to carry out rapid, efficient and intensive treatment on the sludge, so that the method has wide application prospect and good social benefit. The method is a novel method for efficiently and quickly performing solid-liquid separation on the mud and reducing the environmental pollution by combining an electroosmosis method, a medicament adding method and a vacuum preloading method according to the electroosmosis method, the medicament adding method and the vacuum preloading method aiming at the high-water-content waste mud generated in the underground engineering construction and utilizing the mutual superposition and promotion action among the electroosmosis method, the medicament adding method and the vacuum preloading method. Belongs to the field of environmental protection.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
in this embodiment, the electroosmosis-medicament vacuum preloading method adds a corresponding chemical medicament before vacuum preloading in the step a, wherein the chemical medicament not only performs primary solid-liquid separation on the slurry, but also has the effects of increasing the particle size of soil particles in the slurry, forming a spatial structure and increasing the permeability of precipitates; in A, B, C, the agent A has the functions of adsorption, net-catching, electric neutralization and increasing the particle size of soil particles, the agent B has the function of enhancing the effect of the agent A, and the agent C has the functions of assisting filtration and improving efficiency in the vacuum preloading process. In the embodiment, the preparation of the medicament obviously improves the effect of the solid-liquid separation process in the first step, and lays a foundation for the solid-liquid separation process in the first step.
Example three:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, in the step c of the electroosmosis-medicament vacuum preloading method, in the stage of performing the combined action of the vacuum preloading and the electroosmosis method, the electrodes and the plastic drainage plates are arranged in the same row, and meanwhile, the plastic drainage plates are connected with the cathode of the electrodes to realize the combined action, so that the structural distribution and connection relationship of the device are more reasonable, and the device is easy to assemble, disassemble, maintain and use.
Example four:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, the electroosmosis-medicament vacuum preloading method is that in the step c, in the second solid-liquid separation process, in the action stage of the vacuum preloading and the electroosmosis method, a synchronous reinforcing method or an asynchronous reinforcing method is adopted to accelerate the discharge of water, so as to further optimize the effect of the solid-liquid separation process.
Example five:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, the electroosmosis-drug vacuum preloading method is that in the step c, the polarity of the positive and negative electrodes is switched at certain time intervals during the action stage of the vacuum preloading and electroosmosis method. In order to prevent the corrosion of the cathode and the anode, the polarity of the cathode and the anode is switched at certain intervals, so that the working stability of the whole equipment is improved, and the efficiency and quality level of treatment are maintained.
Example six:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, the electroosmosis-medicament vacuum preloading method, in the step c, increases the pH value at the cathode in the action stage of vacuum preloading and electroosmosis method, and promotes the hydration dissociation reaction of the substances in the soil body. Under the effect of the electric field, the physical and chemical reactions of the chemical agents and the soil body are stronger, the reaction degree is larger, the property of the soil body is more stable and the strength is larger under certain conditions, the pH value at the cathode is increased, the hydration and dissociation of substances in the soil body are promoted, the effect of the solid-liquid separation process is further optimized, pollutants are reduced, and the environment is favorably controlled.
Example seven:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, the electroosmosis-medicament vacuum preloading method is applicable to a range including, in addition to the engineering waste slurry: hydraulic fill sludge produced in the process of sea reclamation by hydraulic fill, dredging sludge produced in a dredging channel, ore washing sludge produced in the process of mining, sludge produced in the process of urban life and water treatment and other high-water content fluid state mud-water mixtures. The electroosmosis-medicament vacuum preloading method can be combined with the process of reclamation of land by sea reclamation, at the moment, medicaments can be added in the process of conveying and reclamation of flow state sludge by using a pipeline to finish the first step of solid-liquid separation, and after reclamation to the land by enclosure, vacuum preloading and electroosmosis are carried out to finish the second step of solid-liquid separation. The embodiment adopts a new method for solid-liquid separation by sludge treatment, and adopts the combination of an electroosmosis method, a medicament adding method and a vacuum preloading method to carry out rapid, efficient and intensive treatment on the sludge, so that the method has wide application prospect and good social benefit.
In summary, in the electroosmosis-medicament vacuum preloading method according to the above embodiment of the invention, under the action of the vacuum load, the hydrogen and oxygen gathered at the electrode due to the electrolysis and the water vapor formed under the action of the heat are more easily discharged, so that the contact area between the electrode and the soil body is increased, the interface resistance is reduced, and the discharge of the water in the soil body in the form of gas is further accelerated. In the stage of combining electroosmosis and vacuum preloading, electroosmosis can effectively promote weak bound water in the slurry to be discharged, and the consolidation speed is accelerated. And the vacuum preloading can promote the consolidation of the mud near the cathode, the electroosmosis can promote the consolidation of the mud near the anode, and the vacuum preloading and the electroosmosis can effectively improve the strength of the mud near the cathode and the anode in combined action.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes and modifications may be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, so long as the purpose of the present invention is met, and the present invention shall fall within the protection scope of the present invention without departing from the technical principle and inventive concept of the electroosmotic-pharmaceutical vacuum preloading method of the present invention.
Claims (10)
1. An electroosmosis-medicament vacuum preloading method is characterized in that chemical medicaments are added into waste slurry, electroosmosis and vacuum preloading are combined, and solid-liquid separation treatment is carried out on the waste slurry, and the method comprises the following steps:
a. the first solid-liquid separation process: analyzing the characteristics of the waste slurry to be treated, determining the doping amount and proportion of chemical agents according to physical and chemical analysis, sequentially adding the chemical agents into a sedimentation tank filled with the waste slurry, fully and uniformly stirring and mixing the chemical agents by a stirrer, standing the mixture to enable solid particles in the waste slurry to naturally precipitate, taking samples from the sedimentation tank for analysis after the waste slurry is layered after standing for a certain time, and discharging upper liquid after indexes reach required values to finish the first solid-liquid separation process;
b. b, arranging a vacuum network drainage system in the vacuum solid-liquid separation tank according to design requirements while naturally precipitating the waste slurry in the step a;
c. the second step of solid-liquid separation process: after the first solid-liquid separation process in the step a is finished, pumping the precipitate into a solid-liquid separation pool with a vacuum network drainage system arranged in the step b by using a pump, wherein the pumping amount is determined according to the design requirement; then inserting steel bars into the sediments in the solid-liquid separation tank at equal intervals to serve as a cathode and an anode, and connecting the cathode of the electrode with a vertical drainage pipe; laying geotextile and a sealing film on the sediment according to requirements to form an air leakage prevention sealing structure in the solid-liquid separation tank; and the vertical drain pipe is connected with the header pipe, so that the connecting pipe of the header pipe is connected with the vacuum pump, the cathode and the anode of the electrode are connected with the direct current power supply through cables, the vacuum loading process is carried out after the device is arranged, a method of vacuumizing firstly and then combining with electroosmosis is adopted, vacuum preloading drainage is adopted at the initial stage of the solid-liquid separation process of the second step, and when the test soil body reaches the optimal critical water content, drainage is carried out by combining with the electroosmosis method, the concrete steps are as follows:
firstly, carrying out a vacuum preloading process, sampling and analyzing the property of the precipitate at intervals of a certain time according to requirements, and simultaneously acting on the precipitate by combining an electroosmosis method when the optimal critical water content is reached; then sampling at intervals to analyze the property of the precipitate, and stopping vacuum loading and electroosmosis when the property of the precipitate at least reaches the water content and strength indexes required by design so as to complete the solid-liquid separation process of the second step;
d. and c, after the solid-liquid separation process in the second step is finished in the step c, removing the vacuum network drainage system and the electroosmosis system, and conveying the precipitate in the solid-liquid separation tank to a required place by using a earthwork vehicle to finish the treatment.
2. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: in the step a, before vacuum preloading, adding a corresponding chemical agent, wherein the chemical agent not only performs primary solid-liquid separation on the slurry, but also has the functions of increasing the particle size of soil particles in the slurry, forming a space structure and increasing the permeability of precipitates; in A, B, C, the agent A has the functions of adsorption, net-catching, electric neutralization and increasing the particle size of soil particles, the agent B has the function of enhancing the effect of the agent A, and the agent C has the functions of assisting filtration and improving efficiency in the vacuum preloading process.
3. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: in the step c, in the stage of carrying out the combined action of the vacuum preloading and the electroosmosis method, the electrodes and the plastic drainage plate are arranged in the same row, and the plastic drainage plate and the electrode cathode are connected together to realize the combined action.
4. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: in the step c, the main drainage pipe is a PVC pipe or a steel pipe; the horizontal drain pipe and the vertical drain pipe are made of soft or hard PVC pipes, corrugated filter pipes or plastic drain plates and are connected to form a three-dimensional drain channel, the soft permeable pipe is externally coated with a filter membrane, and each main drain pipe is converged to a drain connecting pipe and is connected with the vacuum pump.
5. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: in the step c, in the solid-liquid separation process of the second step, in the action stage of vacuum preloading combined with the electroosmosis method, a synchronous reinforcing method or an asynchronous reinforcing method is adopted to accelerate the discharge of water.
6. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: in the step c, in the action stage of vacuum preloading and electroosmosis method, the polarity of the positive and negative electrodes is switched at certain time intervals.
7. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: in the step c, in the action stage of the vacuum preloading and the electroosmosis method, the pH value at the cathode is increased, and the hydration dissociation reaction of substances in the soil body is promoted.
8. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: and c, in the step a, naturally precipitating solid particles in the waste slurry, standing for a certain time for layering the waste slurry, then sampling and analyzing the waste slurry from the sedimentation tank, when the index does not reach the required value, continuing standing and sampling analysis until the index reaches the required value, and discharging the upper liquid to finish the first solid-liquid separation process.
9. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: in the step c, when the vacuum preloading is adopted for draining in the initial stage of the solid-liquid separation process in the second step, sampling is carried out to analyze the property of the precipitate, when the optimal critical water content is not reached, the vacuum preloading is continuously kept for draining, then the sampling analysis is continuously carried out, and when the optimal critical water content is reached, the electroosmosis method is combined to act on the precipitate simultaneously.
10. The electroosmotic-pharmaceutical vacuum preloading method according to claim 1, wherein: and c, sampling and analyzing the property of the precipitate in the action stage of the vacuum preloading and electroosmosis method, continuing to keep the action of the vacuum preloading and electroosmosis method when the water content or strength index required by the design is not reached, and stopping the vacuum loading and electroosmosis action until the water content and strength index required by the design is at least reached to finish the solid-liquid separation process in the second step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910961749.5A CN110723878A (en) | 2019-10-11 | 2019-10-11 | Electroosmosis-medicament vacuum preloading method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910961749.5A CN110723878A (en) | 2019-10-11 | 2019-10-11 | Electroosmosis-medicament vacuum preloading method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110723878A true CN110723878A (en) | 2020-01-24 |
Family
ID=69219922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910961749.5A Pending CN110723878A (en) | 2019-10-11 | 2019-10-11 | Electroosmosis-medicament vacuum preloading method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110723878A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112174457A (en) * | 2020-10-22 | 2021-01-05 | 江苏科技大学 | Device and method for treating waste slurry by combining flocculation and electroosmosis |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101245592A (en) * | 2008-03-26 | 2008-08-20 | 张志铁 | Soft groundsill fastening method based on vacuum electroosmosis composite preloading method |
| CN101311133A (en) * | 2008-02-05 | 2008-11-26 | 陈江涛 | Tank type electroosmosis sludge soil reproducing method and device thereof |
| CN102393404A (en) * | 2011-09-15 | 2012-03-28 | 王军 | Large model test box for studying electroosmosis consolidation treated soft soil foundation |
| CN102900067A (en) * | 2012-10-31 | 2013-01-30 | 上海大学 | Processing method for reinforcing soft clay ground through vacuum preloading in combination with electro-osmosis method |
| CN103541348A (en) * | 2013-10-10 | 2014-01-29 | 河海大学 | System and method for reinforcing sand-contained soil interlayer soft foundation in vacuum-electro-osmosis combination mode |
| CN104961270A (en) * | 2015-06-13 | 2015-10-07 | 武亚军 | Agent vacuum pre-compression method for treating engineering waste slurry |
| CN105256788A (en) * | 2015-11-04 | 2016-01-20 | 上海大学 | Saturated dredger soft soil foundation reinforcing treatment system and grid-type vacuum preloading and electroosmosis-method combined treatment method |
-
2019
- 2019-10-11 CN CN201910961749.5A patent/CN110723878A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101311133A (en) * | 2008-02-05 | 2008-11-26 | 陈江涛 | Tank type electroosmosis sludge soil reproducing method and device thereof |
| CN101245592A (en) * | 2008-03-26 | 2008-08-20 | 张志铁 | Soft groundsill fastening method based on vacuum electroosmosis composite preloading method |
| CN102393404A (en) * | 2011-09-15 | 2012-03-28 | 王军 | Large model test box for studying electroosmosis consolidation treated soft soil foundation |
| CN102900067A (en) * | 2012-10-31 | 2013-01-30 | 上海大学 | Processing method for reinforcing soft clay ground through vacuum preloading in combination with electro-osmosis method |
| CN103541348A (en) * | 2013-10-10 | 2014-01-29 | 河海大学 | System and method for reinforcing sand-contained soil interlayer soft foundation in vacuum-electro-osmosis combination mode |
| CN104961270A (en) * | 2015-06-13 | 2015-10-07 | 武亚军 | Agent vacuum pre-compression method for treating engineering waste slurry |
| CN105256788A (en) * | 2015-11-04 | 2016-01-20 | 上海大学 | Saturated dredger soft soil foundation reinforcing treatment system and grid-type vacuum preloading and electroosmosis-method combined treatment method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112174457A (en) * | 2020-10-22 | 2021-01-05 | 江苏科技大学 | Device and method for treating waste slurry by combining flocculation and electroosmosis |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104961270B (en) | A kind of medicament vacuum method for handling engineering useless slurry | |
| CN102162239B (en) | Soft soil foundation treated by chemical-solution-combined injection electroosmosis method and construction method of soft soil foundation | |
| CN102815854B (en) | Method for promoting rapid drying of dredged silt by microorganism | |
| CN110512589B (en) | Vacuum drainage-reducing and magnesium oxide carbonization combined shallow ultra-soft foundation curing method | |
| CN103334469B (en) | The treatment system removed for inner city pollution of river bed mud and treatment process | |
| CN110127988B (en) | Method for treating polluted sludge through electroosmosis and solidification combination | |
| CN106988295B (en) | Sludge dewatering and cured processing method and its processing equipment are carried out using ground treatments | |
| CN208717124U (en) | Dredging and sludge treatment system | |
| CN106734178A (en) | Comprehensive restoration system and method for polluted site | |
| CN110512591B (en) | Reinforcing method for vacuum preloading and carbonization ultra-soft foundation by utilizing gas injection of guide pipe pile | |
| CN203498891U (en) | Treatment system for removing polluted bed mud in river channel of central urban area | |
| CN114477673A (en) | River sludge resource utilization treatment method | |
| CN112502131A (en) | Environment-friendly land making method for reinforcing engineering muck and soft soil foundation in layered mode | |
| CN105645709B (en) | Solution gas-medicament vacuum method | |
| CN111018278A (en) | In-situ remediation system and method combining bottom sediment heavy metal pollution treatment with dehydration and solidification | |
| CN112593563B (en) | Method and device for on-site composite treatment and filler utilization of waste mud for power grid construction | |
| CN102485666A (en) | Technology of in situ harmless treatment on waste drilling mud | |
| CN111395299A (en) | Multifunctional combined type vacuum preloading treatment method for sludge with high water content and high organic matter content | |
| CN111153585A (en) | Environment-friendly dredging and recycling method for polluted bottom mud | |
| CN107010811A (en) | A kind of method of dredging silt fast dewatering | |
| CN110723878A (en) | Electroosmosis-medicament vacuum preloading method | |
| CN105776807A (en) | Movable rapid on-site dewatering system and method for building mud | |
| CN106698871A (en) | Innocuous dredging decrement and dehydration processing method | |
| CN211688742U (en) | In-situ remediation system combining bottom sediment heavy metal pollution treatment with dehydration and solidification | |
| CN201406681Y (en) | Pre-reinforcement processing device of mixed hydraulic reclamation soft soil foundation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200124 |
|
| RJ01 | Rejection of invention patent application after publication |