277results about "Fixation/solidifcation sludge treatment" patented technology

The invention discloses a mixing and feeding electric control system with a liquid level sensing function, and relates to the field of control systems. An adaptive parameter configuration module; a multi-stage gradient stirring module; a real-time data twinning processing module; a remote cooperative monitoring module; a fault linkage processing module; and an energy-saving closed-loop control module. According to the system, the material characteristic pre-detection module is combined with the water content-viscosity-medicament dosage three-dimensional mapping table and the viscosity-rotating speed mapping table, so that real-time scanning and parameter quantitative matching of the granularity, the water content and the viscosity of the industrial waste are realized; according to the scheme, the stirring sufficiency of the high-viscosity industrial sludge is improved, the energy consumption of the low-viscosity material is reduced, the dosage of the medicament is automatically matched according to the three-dimensional mapping table, the utilization rate of the curing agent is improved, and the core problems of stirring waste and insufficient stirring are fundamentally solved.

The invention discloses a river and lake polluted bottom mud environment-friendly dredging and solidification treatment continuous treatment method, and relates to the technical field of environmental protection engineering.The method comprises the following components of S100, ecological dredging control range and depth, S200, bottom mud conveying and dewatering, S300, solidification treatment and resource utilization, and S400, residual water treatment and recycling. According to the method, the control range and depth of ecological dredging are accurately determined, the influence of the flow speed and the flow direction on migration and transformation of bottom mud pollutants is simulated through a hydrodynamic model, large-scale release of the pollutants in the dredging process is effectively avoided, meanwhile, in the bottom mud conveying and dewatering stage, efficient conveying equipment and an optimized filtering device are adopted, and the efficiency is improved. Disturbance and release of the bottom mud in the conveying and dewatering process are reduced, and the risk of secondary pollution is further reduced.

The invention relates to the technical field of seabed sand excavation pit repair, and discloses a seabed sand excavation pit repair control method and system based on marine dredged mud. The method comprises the steps that surveying and mapping and environment analysis are conducted on a seabed sand excavation pit, three-dimensional topographic data are obtained, and dredged mud is improved; formulating a filling scheme based on data analysis, and establishing a barge and pipeline combined transportation system; filling materials layer by layer, and tamping and grouting; a three-layer protection structure is constructed, and a gabion mesh cage and an energy dissipation device are additionally arranged in a high-risk area; and the restoration effect is evaluated by monitoring the network to form an evaluation database. According to the method, marine dredged mud is used as a main material, and efficient and stable repairing of the seabed sand excavation pit is achieved through scientific improvement treatment and layered filling technologies in combination with multi-layer protection measures and a perfect monitoring and evaluating system.

The invention belongs to the field of lake ecological desilting, and discloses a shallow lake bottom mud ecological desilting and residual water treatment combined treatment method which comprises lake bottom mud ecological desilting, solidification dehydration treatment and residual water treatment. Ecological dredging of the lake bottom mud is implemented by adopting an environment-friendly cutter suction dredger and a sealed pipeline to convey mud, and the bottom mud is conveyed to a mud discharge field to be solidified and dehydrated. A vacuum preloading technology is adopted for solidification and dehydration of the bottom mud, pore water of the bottom mud is effectively discharged by increasing the pressure difference between soil bodies of a drainage plate, and the overall solidification effect is improved. The residual water treatment comprises the treatment of desilting and solidifying residual water, the technologies of multi-stage precipitation, mechanical aeration, aquatic plant remediation and the like are adopted, and the residual water is discharged nearby after being treated to reach the standard. The combined treatment method aims at effectively reducing endogenous pollution of lakes, promoting lake water quality improvement and guaranteeing water safety of regional lakes and reservoirs, and is particularly suitable for ecological dredging engineering of shallow lakes, short construction period and fine-particle bottom mud.

The invention discloses a printing and dyeing wastewater advanced treatment and salt control recycling process and system, and belongs to the technical field of wastewater treatment. According to the process, the printing and dyeing wastewater is sequentially subjected to pretreatment of grating interception, adjustment and homogenization, and coagulating sedimentation; carrying out hydrolytic acidification and biochemical treatment in a membrane bioreactor; softening treatment of ozone oxidation complex breaking and fluidization crystallization softening; carrying out nanofiltration separation to obtain a permeate and a concentrated solution; carrying out seed crystal fluidization descaling on the concentrated solution; respectively carrying out membrane concentration on the nanofiltration permeate and the descaled concentrated solution through reverse osmosis to obtain sodium chloride and sodium sulfate concentrated solutions; and finally, carrying out evaporation curing treatment on the sludge and the crystallized waste residues. Through multi-step cooperative treatment, deep purification of the printing and dyeing wastewater and efficient separation and recycling of salt are realized, and the problems of impure nanofiltration salt separation and high system scaling risk in the prior art are solved.

The invention discloses high-fluidity under-sea non-dispersible high-performance solidified sludge soil and a preparation method thereof, and belongs to the technical field of ocean engineering seabed leveling, repairing and scour prevention. Setting of a curing agent, a coupling agent and a flocculating agent is determined according to different mineral compositions of the sludge. The chitosan quaternary ammonium salt can be used after being prepared into a solution by adding deionized water, and in order to ensure that the chitosan quaternary ammonium salt is fully dissolved, when the chitosan quaternary ammonium salt solution is prepared, the ratio of the chitosan quaternary ammonium salt to the deionized water is not greater than 1: 3. According to the solidified sludge soil and the preparation method thereof, the underwater non-dispersing performance of the solidified sludge soil in a marine environment is remarkably improved by setting the curing agent, the coupling agent and the flocculating agent according to mineral components of the sludge soil on an engineering site, and meanwhile, the flowing performance of the solidified sludge soil is reserved to meet construction requirements. Various mechanical properties of the solidified silt soil are effectively improved, and the solidified silt soil has good compression resistance and bonding performance and has guiding significance in the technical field of ocean engineering seabed leveling, repairing and scouring resistance.

The invention discloses a sludge treatment method and system, and relates to the field of solid waste treatment, and the method specifically comprises the following operation steps: S1, multi-frequency resonance pretreatment: destroying a sludge colloid structure through stepped mechanical vibration: collapsing an extracellular polymer network at a low frequency, breaking down microbial cell walls at an intermediate frequency to release intracellular water, pathogenic bacteria are inactivated through a high-frequency cavitation effect; s2, performing electrochemical in-situ flocculation; s3, gradient pressure dehydration; s4, low-temperature mineralization stabilization; and S5, vacuum condensation and recovery. According to the sludge treatment method and system, through stepped low-frequency, medium-frequency and high-frequency mechanical resonance, the colloid structure of the sludge can be directionally damaged, the fluidity of the sludge is remarkably improved, chemical conditioners are remarkably reduced, agent residues and secondary pollution are avoided, pathogens are physically inactivated through the high-frequency cavitation effect, and the treatment effect of the sludge is improved. Micro-nano oxygen bubbles are synchronously generated to strengthen free radical oxidation, and a sterile environment is created for subsequent mineralization.

The invention provides an in-situ curing and repairing method for heavy metals in river sediment. The in-situ curing and repairing method comprises the following steps: S1, detecting the content and physicochemical properties of the heavy metals in the river sediment; s2, designing a repair material formula; s3, preparing and putting a repairing material; s4, mixing and stirring the bottom mud and the repairing material; s5, monitoring and evaluating the repairing effect; and S6, repairing effect feedback and adjustment. According to the method, multiple linear regression, curved surface fitting, self-organizing mapping and mixed density network algorithms are fused, the sediment heavy metal content and physicochemical property data are fully utilized, a repair material formula can be accurately designed, and compared with a traditional single algorithm or empirical formula design, the repair material proportion can better fit the actual pollution condition, and the repair efficiency is improved. The utilization rate of repair materials is improved.

The invention discloses hazardous waste-containing sludge solidification mixing equipment which comprises a stirring box and two stirring shafts located in the stirring box, and a first stirring blade, a second stirring blade, a third stirring blade and a fourth stirring blade are rotationally connected to rotating cylinders of the stirring shafts respectively; a first adjusting rod, a second adjusting rod, a third adjusting rod and a fourth adjusting rod which are coaxial are arranged in the rotating cylinder, the first stirring blade is connected with the first adjusting rod through a first connecting structure, the second stirring blade is connected with the second adjusting rod through a second connecting structure, and the third stirring blade is connected with the third adjusting rod through a third connecting structure. The fourth stirring blade is connected with a fourth adjusting rod through a fourth connecting structure, the angle change of the stirring blade can be formed by moving the adjusting rod, the angle of the stirring blade on the stirring shaft of the sludge solidification mixing equipment can be adjusted, so that different stirring modes are formed, and the stirring requirements of different sludge-solidification agent systems are met.

The invention provides a biochar repairing agent for marine sediments and a preparation method of the biochar repairing agent, and belongs to the technical field of repairing agents. The preparation method comprises the following steps: carbonizing straws, modifying by phosphoric acid and concentrated nitric acid, depositing ferroferric oxide-titanium dioxide, loading UiO-66-(COOH) 2 on the surface, coupling cyclodextrin-MOF and chitosan, crosslinking, performing magnet separation, washing and drying to obtain the biochar repairing agent for the marine sediments. The biochar repairing agent for the marine sediments prepared by the invention has a relatively large specific surface area and a plurality of coordination groups, can better fix heavy metal ions in the marine sediments, also has a photocatalytic degradation effect on organic pollutants, and is good in mechanical strength, easy to store and transport, safe, environment-friendly and easy to separate; wide application prospects are realized.

The invention discloses a dehydration, crushing and curing integrated treatment method for sand washing mud. Comprising the following steps: mixing a conditioner with sand washing mud, dehydrating and crushing, mixing and stirring with a curing material, extruding, vibrating and molding, and curing to obtain the sand washing mud-based cured body. According to the invention, polyacrylamide, polyaluminum chloride and fly ash / coal gasification slag are used as conditioners, colloidal particles are flocculated and precipitated under the effects of electrical neutralization, adsorption bridging and net capturing of the conditioners, and fly ash / coal gasification slag plays a role in a skeleton, so that a drainage channel can be provided inside the sand washing mud, the problem of crushing of a filter cake is solved, and the service life of the filter cake is prolonged. The method realizes the spanning of high pollution and low efficiency of sand washing mud treatment to recycling and high performance, has triple values of process innovation, environmental protection standard reaching and economic feasibility, and provides an efficient solution for recycling of building wastes. Meanwhile, the invention is suitable for multi-scene building application of roadbed materials, baking-free bricks, artificial aggregates and the like.

The invention discloses a sludge composite curing agent and application thereof in sludge curing, carbon sequestration and emission reduction, and belongs to the technical field of sludge curing. The sludge composite curing agent comprises the following components in percentage by mass: 40-60% of slag, 20-40% of carbide slag and 10-20% of biochar. The curing agent can realize curing of sludge and improve mechanical properties (such as compressive strength and the like) of the cured sludge, and in addition, the prepared cured sludge has a relatively good absorption effect on CO2, can reduce emission of greenhouse gases, and has a good promotion effect on carbon sequestration and emission reduction.

The present invention relates to a material for solidifying high-organic sludge and a solidification method thereof. The material comprises the following raw materials, measured by weight: 0.5 to 1.5 parts of an oxidant, 1.5 to 3 parts of a sacrificial agent, 0.5 to 2 parts of a reinforcing agent, and 8 to 22 parts of a cementitious material. During the specific solidification process, the oxidant and the sacrificial agent are first added to the sludge and mixed. After standing and conditioning, the supernatant on the surface of the sludge is discharged; then, the reinforcing agent and the curing agent are added to the precipitate, mixed evenly, and then allowed to stand and cured to complete the solidification process. The material and method provided by the present invention utilize bulk solid waste as the solidification material, are low in cost, can be targeted to solidify high-organic sludge, have strong solidification workability, and achieve efficient, economical, and environmentally friendly solidification of the sludge. After solidification, the bearing capacity of the soil foundation can meet the requirements of relevant construction foundations.

The invention belongs to the technical field of river and lake water ecological restoration, and particularly discloses equipment and a method suitable for river and lake endogenous polluted sediment treatment, the equipment suitable for river and lake endogenous polluted sediment treatment comprises a material stirring unit and a curing granulation unit, the material stirring unit comprises a horizontal stirring machine box and is used for stirring and mixing raw materials, and the curing granulation unit is used for curing and granulating the raw materials; one side of the horizontal stirring machine box is connected with a loess spiral feeder, a bottom mud spiral feeder and a curing agent spiral feeder, and a loess crusher is connected between the loess spiral feeder and the horizontal stirring machine box. According to the method, the polluted bottom mud is efficiently converted into the ecological restoration matrix which is resistant to water flow scouring and stable in physical structure through a curing granulation process, the matrix can be directly applied to an underwater environment, and the core problem that existing ecological planting soil prepared through bottom mud recycling cannot be stabilized in a water area is solved; and a key matrix material is provided for in-situ construction of an underwater ecological system such as an underwater forest.

The present disclosure provides an in-situ electric stratified remediation device and method for accurate position in remediation depth in sediment. the device includes a telescopic rod, a porous cylinder, a water storage tank, a curing agent storage device, and a depth determining module. The water storage tank is configured to collect sediment pore water and contaminants converged along a surface groove of a columnar electrode; and the fixed determining module is configured to send an indication information in response to that the curing agent storage device is inserted below a mud-water interface, while triggering release of curing agent from a wall of the curing agent shroud.

The invention relates to the technical field of river sludge solidification, in particular to a river dredging sludge solidification treatment device which comprises a box body, a sludge pipe is fixedly installed on the box body, a mixing assembly is fixedly installed at the end, located in the box body, of the sludge pipe, a solidification assembly is fixedly installed on the box body, and the solidification assembly is located below the mixing assembly; external lime powder enters the lime pipe in an air blowing mode, sequentially passes through the air shell and the particle pipe and enters the uniform distribution pipe, the lime powder is sprayed to the bottom of the mixing tank through the powder nozzles on the surface of the uniform distribution pipe to complete distribution of the lime powder, and then the output end of the distribution motor drives the crankshaft to rotate. The sliding rod drives the abutting plate to move downwards, the abutting plate drives the soft rubber sealing plug to move downwards, the soft rubber sealing plug is separated from the inner wall of the mixing tank, sludge flows in along the inner wall of the mixing tank and makes contact with lime powder at the bottom to be fused, the water content of the sludge is reduced, the sludge is pretreated, and the subsequent chemical curing effect is improved.

The application relates to the technical field of sludge treatment, and discloses a sludge soil solidification and ecological improvement solidification device which comprises a device shell and a collecting box, a movable blocking plate is slidably connected in the device shell, and a stirring barrel is attached to the top of the movable blocking plate. The sludge soil solidification and ecological improvement solidification device and the operation method thereof effectively solve the problem that, in actual use, the device adopts a sludge extrusion mode for sludge dewatering, part of the sludge overflows from the extrusion equipment during the extrusion process, the device cannot effectively dewater the sludge, and the dewatering efficiency of the device is low. In the whole operation process, the sludge in the barrel is clamped and heated to accelerate the dewatering speed of the sludge, the sludge in the device can be effectively prevented from overflowing, the dewatering efficiency of the device for the sludge can be greatly improved, and therefore the working efficiency of the device is greatly improved.

The invention discloses a sustained-release wrapping material for thallium immobilization, a preparation method and application, the wrapping material uses a mixture composed of an aluminosilicate carrier and an organic sulfur chelating agent loaded on the carrier as a core-spun material, and hydroxide and / or carbonate as a coating material to wrap the core-spun material. The preparation method comprises the following steps: firstly, adding the organic sulfur chelating agent into the aluminosilicate carrier, adding water, uniformly stirring, then adding the binder, and carrying out primary granulation and drying to obtain the core-spun material; and mixing the hydroxide and / or carbonate with the core-spun material, adding water to prepare slurry, and performing secondary granulation and drying. The slow-release wrapping material can efficiently act on the lepidolite tailings for a long time, so that the leaching toxicity of thallium in the lepidolite tailings is always maintained at a relatively low level, and the slow-release wrapping material has the characteristics of high stabilization rate, stable performance, long-term effectiveness, easiness in storage and easiness in use. The slow-release wrapping material is wide in application range, is not only suitable for thallium-containing lepidolite tailings, but also suitable for thallium-containing sludge, thallium-containing wastewater and the like, and is short in production process flow, simple to use and operate and wide in application prospect.

The invention discloses a sludge solidification and hydraulic reclamation method based on an MICP technology. The method comprises the steps that the water content of bottom mud, the density of the bottom mud, the age of the bottom mud and the environment type are obtained; differentiated MICP serous fluid is prepared based on environment types, a seawater type cementing fluid is composed of seawater, urea and CaCl2, and a fresh water type cementing fluid is composed of deionized water, urea and CaCl2; after bottom mud is dug and stirred and diluted, a to-be-dredger-filled area is pretreated according to the environment type, a dispersing agent is added into the seawater environment, and a flocculating agent is added into the fresh water environment; respectively conveying a bacterial liquid and a cementing liquid into the diluted bottom mud through two channels, and mixing the bacterial liquid and the cementing liquid; and after mixing, the solidified sludge is immediately blown and filled to the area to be blown and filled. According to the invention, targeted curing treatment of seawater and fresh water scenes is realized through an environment-adaptive cementing liquid formula, differential pretreatment and dual-channel conveying control.

The invention discloses a sludge synergistic curing agent based on microbial mineralization and nano-compounding and a preparation method thereof. The sludge synergistic curing agent is prepared from the following components in percentage by mass: 20%-30% of fly ash, 15%-20% of sulphoaluminate cement, 10%-15% of modified phosphogypsum powder, 15%-20% of charcoal loaded nano iron, 5%-10% of attapulgite, 6%-10% of polyaspartic acid-co-acrylamide, 4%-5% of sodium carboxymethyl cellulose, 3%-5% of silica fume, 1%-3% of magnesium carbonate and 1%-2% of tartaric acid. The sludge synergistic curing agent is used for innocent treatment of river dredging sludge and industrial sludge, and rapid dehydration and high-strength curing of sludge and long-acting stabilization of pollutants are realized through synergism of the adsorption performance of the biochar, the reduction stabilization effect of the nano-iron and the cementation effect of a composite gel system.

The invention discloses a dredged soil separation, consolidation and dehydration integrated device and a working method, the dredged soil separation, consolidation and dehydration integrated device comprises: a cyclone separation module for completing preliminary solid-liquid separation of dredged mud under the action of centrifugal force; the stirring consolidation module is used for mixing and stirring the thick slurry separated by the cyclone separation module and a curing agent to quickly consolidate the thick slurry to obtain dredged soil paste; and the roller drying module is used for drying and dewatering the dredging soil paste, and the conveying directions of the dredging soil paste and the drying gas in the roller are opposite. During working, the cyclone separation module is used for carrying out primary solid-liquid separation on dredged mud; feeding the separated thick slurry into a stirring consolidation module, and mixing and stirring the thick slurry with a curing agent to quickly consolidate the thick slurry to obtain dredged soil paste; and the dredged soil paste obtained through stirring and consolidation is fed into a roller drying module to be subjected to rotary drying. Through the multi-stage treatment process and progressive layer by layer, the recycling working time of the dredged soil can be quickly shortened, and the quality of the dredged soil can be remarkably improved.

The invention provides an ardealite-based curing agent for high-water-content river dredged sludge and a method for curing sludge and making bricks by using the ardealite-based curing agent, and belongs to the technical field of solid waste recycling and environmental engineering. The ardealite-based curing agent for the high-water-content river dredged sludge comprises the following components in percentage by mass: 60%-70% of semi-hydrated ardealite, 5%-10% of particle size graded ardealite-based aggregates, 5%-10% of montmorillonite powder, 0.75%-3% of nano silicon dioxide and 7.5%-15% of an alkali activator, and the sum of the mass fractions of all the components is 100%. The ardealite aggregates are prepared from industrial ardealite, slag powder and cement according to the mass ratio of (75 to 85) to (5 to 15) to 10. The ardealite is used for treating the sludge, efficient solidification and resource utilization of the sludge are achieved through a composite cementing material synergistic excitation technology, a dynamic aging reaction process regulation and control technology and a heavy metal stabilization integration technology, and the purposes of improving the resource reutilization rate of the ardealite, reducing the cost of solidifying the sludge and achieving resource reutilization of the sludge are achieved.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method and system for removing heavy metals in wastewater, and the system comprises a collecting tank, a regulating tank, a Fenton-ultrasonic synergistic reaction tank, an addition and reduction sedimentation tank, a flocculation tank, a first sedimentation tank, a three-cavity nickel removal tank, a second sedimentation tank, a multi-parameter monitoring tank, an A / O tank, a third sedimentation tank and a clean water tank which are communicated in sequence. Discharging the adjusted wastewater containing the heavy metals into a Fenton-ultrasonic synergistic reaction tank to realize complex breaking of the complex-state heavy metals; adjusting the wastewater subjected to complex breaking treatment to be neutral, so that heavy metals are converted into hydroxide precipitates, and most of the heavy metals are removed at the stage; discharging the treated water into a flocculation tank, standing and precipitating, and enabling supernate to enter a nickel removal tank; and an organic sulfur catching agent is added into the nickel removal tank to strengthen chelation reaction, so that the nickel content is less than 0.1 ppm. According to the system, through four-stage cooperation of oxidation, precipitation, dynamic capture and intelligent feedback, the complex nickel removal problem is solved, and the comprehensive heavy metal removal rate is larger than or equal to 99.5%.

The invention discloses a drilling fluid waste liquid continuous purification treatment device which comprises a drilling cutting screening mechanism with a first solid material discharge port, a second solid material discharge port and a liquid discharge port, the inlet end of a drilling cutting discharge component is communicated with the first solid material discharge port, the inlet end of an extrusion type dehydration mechanism is communicated with the second solid material discharge port, and the outlet end of the extrusion type dehydration mechanism is communicated with the liquid discharge port. The inlet end of the multi-stage drawer type purification mechanism is communicated with the liquid outlet, and an adjustable material stirring mechanism is arranged at the inlet end of the drilling cutting screening mechanism. According to the invention, the investment cost of equipment can be effectively reduced, the convenience of transportation, transfer, installation, maintenance and the like is improved, solids and harmful substances in waste liquid can be removed step by step, so that the whole purification treatment process is in a continuous state, the purification treatment efficiency is improved, the solids and harmful substances are harmlessly treated according to requirements, and the environmental pollution is reduced. And the condition of environmental pollution is avoided. The method is suitable for the technical field of drilling fluid waste liquid in well drilling.

The invention belongs to the technical field of auxiliary preparation, and provides a curing material applied to a flameless combustion process of copper-containing sludge and a preparation method. The preparation method comprises the following steps: firstly, mixing iron nitrate nonahydrate, ferrous sulfate heptahydrate, a manganous nitrate solution and citric acid to prepare a ferrite precursor; further, a rare earth phosphate nano dispersion is synthesized through a hydrothermal method, lanthanum nitrate hexahydrate and cerium nitrate hexahydrate are used as rare earth sources, and ammonium dihydrogen phosphate and ammonium fluoride are introduced to provide phosphate radicals and fluorine ions; meanwhile, multi-element co-doped amorphous powder is prepared through a sol-gel method, tetraethoxysilane serves as a silicon source, zirconium oxychloride octahydrate, tetra-n-butyl titanate and niobium pentachloride are supplemented, a thermally stable amorphous oxide matrix is formed under high-temperature heat treatment, and the high-temperature mechanical property is provided; and finally, mixing kaolin or bentonite mineral powder with the synthesized ferrite precursor, the rare earth phosphate nano dispersion, the multi-element amorphous powder and other auxiliaries to form slurry, and drying to form the curing material.

The invention discloses movable engineering slurry drying and separating equipment which comprises a feeding module, an aggregate grading module, a slurry flocculation and concentration module, a muddy water drying module and a moving module.By means of the movable engineering slurry drying and separating equipment, slurry is dried, the moisture content is reduced, and therefore the transportation size is reduced, and the transportation efficiency is improved; the transportation cost is reduced. The water content of the slurry is reduced, leakage in the transportation process can be effectively reduced, raised dust and noise pollution are reduced, and the positive influence on the urban environment is generated. As the equipment has mobility, the equipment can adapt to construction sites with limited space and meet the requirements of different projects. The movable equipment reduces the requirement of fixed facilities, saves the construction cost of supporting facilities, and reduces the cost of slurry treatment of the whole project. Due to the centralized module design, the whole treatment process is more compact and efficient, and the treatment speed is increased. The dried mud cake can be used as a raw material of other building materials, so that the cyclic utilization of resources is realized.

The present invention discloses a geotube bag capable of stabilizing heavy metals and achieving efficient dehydration, comprising: an inner fabric layer, the inner side of which is provided with a heavy metal adsorption layer containing a heavy metal adsorbent; an intermediate fabric layer, the intermediate layer located outside the inner fabric; the intermediate fabric having a greater hydrophilicity than the inner fabric; and an average pore size larger than that of the intermediate fabric; and an outer fabric layer located outside the intermediate fabric; the outer fabric having a greater hydrophilicity than the intermediate fabric and an average pore size larger than that of the outer fabric. The geotube bag's unique structure improves dehydration efficiency, avoids secondary contamination of sediment by the use of flocculants, and improves treatment efficiency.

The invention discloses a solid-waste-based dredged sludge high-strength curing agent, a preparation method and application, and relates to the technical field of dredged sludge curing utilization, the solid-waste-based dredged sludge high-strength curing agent comprises 5-30% of coal gangue micro powder, 10-70% of slag micro powder, 5-20% of red mud micro powder, 5-25% of desulfurized gypsum micro powder, 3-30% of an activator, and 1-15% of an inorganic reinforcing agent. The curing agent is low in cost and wide in application prospect, solid waste resource utilization can be achieved, a new green sustainable development mode is constructed, the activity of the solid waste and dredged sludge is improved by adding the activating agent, curing of the dredged sludge is accelerated, and the strength of a cured body is improved by adding the inorganic reinforcing agent.

The application discloses an environment-friendly and efficient solidification and stabilization agent for calcium fluoride sludge and a preparation method thereof, and comprises the following raw materials in parts by weight: a chemical stabilization agent 20-30 parts, an inorganic solidification agent 60-70 parts, a microwave dehydration aid 1-5 parts and a pH regulator 2-5 parts. The application has the advantages of good treatment effect, solves the problems that the existing calcium fluoride sludge treatment agent has poor treatment effect on calcium fluoride sludge in the preparation process, harmful substances and pollutants in the calcium fluoride sludge are easy to penetrate into underground water or soil, environmental pollution is caused, and the treated sludge cannot reach the environmental protection standard and is disposed or utilized, which leads to the problems of re-releasing harmful substances in the use process and forming secondary pollution.

This invention provides a device and method for solidifying dredged slurry, belonging to the field of dredging technology. The device includes a mixing cylinder with a stirring structure inside, and further comprises a separation cylinder, a cylinder unblocking component, and a powder mixing component. The separation cylinder is disposed inside the mixing cylinder, and a first electric push rod is disposed between the separation cylinder and the inner wall of the mixing cylinder. An inlet and an outlet are respectively provided at the top and bottom of the separation cylinder. A bottom plate is rotatably disposed at the outlet, and a second electric push rod is movably disposed between the bottom plate and the separation cylinder. This invention uses the cylinder unblocking component to unblock the filter cylinder, ensuring the separation efficiency and effect of the subsequent filter cylinder in separating mud and water. Furthermore, when the cylinder unblocking component is working, it drives the powder mixing component to work, causing the annular powder box to vibrate, preventing lime powder in the annular powder box from clumping and affecting the mixing effect with the filtered mud, thereby ensuring the slurry solidification efficiency and effect.