210 results about "Dewatered sludge" patented technology

The invention discloses a method for recovering phosphorus through anaerobic digestion by adding sludge-based biochar, which comprises the following steps of: firing dewatered sludge serving as a raw material under an anaerobic condition to obtain carbonized carbon; or firing under an aerobic condition to obtain pyrolytic carbon, adding any sludge-based biochar obtained by firing into the hydrothermal dewatered sludge, and carrying out anaerobic digestion on the hydrothermal dewatered sludge; the hydrothermal dewatered sludge is obtained by performing hydrothermal pretreatment on dewatered sludge; and carrying out phosphorus recovery on the sludge-based biochar subjected to anaerobic digestion by utilizing a magnetic separation method. Compared with the traditional method for recovering the phosphate fertilizer from the sludge incineration ash, the recovery method disclosed by the invention is green and pollution-free, belongs to a sludge treatment mode of treating waste with waste, realizes effective combination of a heat treatment mode and a biological treatment mode, and has a good practical application value. Moreover, the prepared sludge-based biochar has the property of magnetism, so that the recovery rate of the subsequent blue iron ore is increased, and the separation difficulty and economic investment are reduced.

The invention relates to a manufacturing method of a sludge-biomass fuel rod. The manufacturing method comprises the following steps: S1, sludge pretreatment: dehydrating sludge; s2, sludge crushing treatment: performing crushing treatment on the dewatered sludge to obtain sludge particles with the particle size of less than or equal to 3mm; s3, sludge and biomass are mixed, wherein the sludge particles obtained in the step S2 and biomass particles are stirred and mixed according to the mass ratio of (10-90): (90-10), and a sludge-biomass forming raw material is obtained; s4, sludge-biomass raw material extrusion forming: performing extrusion forming on the sludge-biomass forming raw material obtained in the step S3 to obtain the sludge-biomass fuel rod. Compared with the prior art, the prepared sludge-biomass fuel rod has better combustion characteristics and stability. The sludge can play a bonding role in the fuel rod forming process, a compact body structure is conveniently formed, and forming is convenient; and the biomass is beneficial to improving the combustion characteristic of the fuel rod.

The invention provides a sludge-based composite fuel as well as a preparation method and application thereof. The sludge-based composite fuel is prepared from the following raw materials in percentage: 40-60% of dewatered sludge, 20-40% of biomass powder, 3-8% of a nano catalyst and 2-5% of a composite adhesive. According to the sludge-based composite fuel, sludge, biomass and other fuels are mixed according to a certain proportion, the nano-catalyst is added to improve the combustion performance of the sludge fuel, the composite adhesive enhances the forming strength and waterproofness of the fuel, the component proportion and process conditions are optimized, and the sludge-based composite fuel is prepared. The problems that traditional sludge fuel is low in heat value, poor in combustion stability, high in pollutant emission and insufficient in forming storage performance are solved.

The present invention provides a Fenton iron sludge treatment method and device, comprising the following steps: allowing the Fenton iron sludge to enter an iron reduction unit, undergoing reduction treatment under the action of dissimilatory iron-reducing bacteria, reducing the trivalent iron in the Fenton iron sludge to divalent iron through the reduction treatment to obtain reduced iron sludge; allowing at least a portion of the reduced iron sludge to enter a bioleaching unit, undergoing bioleaching treatment under the action of specific microorganisms to obtain a first mixed liquid; dehydrating the first mixed liquid to obtain an aqueous phase and dehydrated sludge, respectively; and returning the aqueous phase to the bioleaching system to participate in the bioleaching treatment. The present invention can solve technical problems existing in the prior art, such as the need for additional acid, the generation of a large amount of strongly acidic water, the susceptibility to environmental pollution, the inability to recycle iron, and high costs.

The invention discloses a concrete production waste slurry environment-friendly treatment system and method.The concrete production waste slurry environment-friendly treatment system comprises a dynamic cyclone separation unit, a membrane filtration integration unit, a chemical flocculation reaction cabin and a resource utilization module which are sequentially connected, and the dynamic cyclone separation unit comprises a multi-stage cyclone set and a variable frequency driving device; the cyclone group realizes particle classification through cyclone cavities with different taper angles and diameters; the membrane filtration integrated unit comprises a hollow fiber ultrafiltration membrane assembly and a cross-flow filtration assembly; the chemical flocculation reaction cabin comprises an on-line water quality monitoring device and a flocculant accurate adding unit; the resource utilization module comprises a sludge carbonization reaction assembly and a clear water recycling pipe network, the sludge carbonization reaction assembly comprises a sludge carbonization reactor and a centrifugal machine, the sludge carbonization reactor converts dewatered sludge into an adsorbent through low-temperature pyrolysis at 400-600 DEG C, and the clear water recycling pipe network is provided with an ultraviolet disinfection device. The sludge carbonization reactor is provided with the waste heat recovery system, high-temperature flue gas heat generated in the sludge carbonization process is transferred to the waste slurry to be treated through the waste heat recovery system, the heating energy consumption in the pretreatment stage is reduced, the treated sludge is treated through the carbonization reactor, a porous carbon adsorbent is generated, and the sludge is recycled. The adsorbent can be used for adsorbing or recycling heavy metal ions, thereby reducing pollution and lowering treatment cost.

This invention provides a sludge dewatering system, including a screw press dewatering machine, a sludge pump, a dosing pump, a stirrer, and a controller. The inlet of the screw press dewatering machine is connected to the outlets of the sludge pump and the dosing pump via pipelines. The outlet of the sludge pump is equipped with a sludge flow meter, the outlet of the dosing pump is equipped with a dosing flow meter, and the filtrate outlet of the screw press dewatering machine is equipped with a filtrate flow meter. The controller is electrically connected to the sludge pump, the dosing pump, the stirrer, the sludge flow meter, the dosing flow meter, and the filtrate flow meter. The screw press dewatering machine has a screw pitch of 3-4 mm, a screw shaft diameter of 40-55 mm, a screw shaft compression ratio of 2-3.5, a screw shaft rotation speed of 3-7 rpm, and an outlet pressure of 0.02-0.04 MPa. The sludge dewatering system of the present invention can adjust the moisture content of the dewatered sludge to between 85% and 95%, provided that the sludge feed rate is stable at 400-680 kg·ds / h and the sludge feed moisture content is between 99% and 96%.

The invention discloses a preparation method of sludge and biomass blended and cured fuel particles based on ultrasonic synergy. The fuel particles comprise 30-40 wt% of dewatered sludge, 60-70 wt% of biomass and 0.5-3.5 wt% of a composite additive, the composite additive is Ca (OH) 2, sodium lignin sulfonate and Fe2 (SO4) 3 in a mass ratio of 2: 1: 0.5; the process comprises the following steps: biomass raw material pretreatment, sludge gradient drying, carbonization ultrasonic reaming, additive injection, ultrasonic blending modification, low-temperature compression molding, low-temperature maintenance and finished product packaging. The method has the advantages of being small in binder dosage, high in production efficiency and low in cost.

The invention belongs to the technical field of sludge dewatering, and particularly relates to a sludge acidification conditioning dewatering method. Comprising the following steps: adjusting the pH value of the sludge to 2-4, then adding a nitrite solution, uniformly mixing, standing for reaction so as to generate free nitrous acid in the system, and carrying out selective oxidative degradation, moisture release, filtration and dehydration on extracellular polymeric substances of the sludge through the free nitrous acid, thereby obtaining the dewatered sludge. According to the method, free nitrous acid with a certain concentration is generated in a sludge system under the combined action of an acidification environment and nitrite, and the free nitrous acid is used for breaking sludge extracellular polymeric substances and releasing water adsorbed and wrapped by sludge flocs, so that the dehydration performance of the sludge is remarkably improved, and the dehydration efficiency is improved.

The invention discloses a method for removing heavy metals in sludge, and belongs to the field of environmental protection technology and solid waste recycling. The method comprises the following steps: adding a bioleaching bacteria solution and a nutritive salt solution into dewatered sludge, and adjusting the pH value to form mixed slurry; applying an asymmetric alternating-current electric field to the mixed slurry to perform biological-electrochemical coupling treatment, and performing solid-liquid separation on the treated slurry to respectively obtain purified sludge and leachate containing heavy metals. By utilizing polarization inhibition and oscillation mass transfer effects of the asymmetric alternating-current electric field, the removal efficiency of the bioleaching on the heavy metals in the sludge, especially the organic combined state and residual state heavy metals, is remarkably enhanced, and the method has the outstanding advantages of short treatment period, low energy consumption, no electrode polarization and high heavy metal removal rate.

This invention discloses a low-leakage, high-stability magnetic sludge biochar adsorbent, its preparation method, and its application, comprising the following steps: S1: preparing a sludge biochar matrix from dewatered sludge; S2: mixing the sludge biochar matrix obtained in step S1 with nano-magnetic powder, and performing high-energy ball milling under an inert atmosphere to obtain a composite powder with a physically interlocked structure, thereby preparing the low-leakage, high-stability magnetic sludge biochar adsorbent. This invention provides a structurally stable, high-adsorption-performance, and environmentally friendly magnetic sludge biochar adsorbent that can effectively remove polyether ionocarrier antibiotics (such as maduramycin) from water, showing promising practical application prospects and environmental benefits.

The invention discloses a denitrification nitrogen removal complex microbial inoculant for industrial wastewater treatment and a preparation method of the denitrification nitrogen removal complex microbial inoculant, and relates to the technical field of wastewater treatment. According to the scheme, dewatered sludge powder is activated through a potassium hydroxide solution, then a magnesium chloride solution is added, magnesium modified sludge carbon is prepared through pyrolysis, then tea polyphenol serves as a reducing agent, zero-valent iron is loaded on the surface of the magnesium modified sludge carbon, and zero-valent iron loaded sludge carbon is obtained; on the basis, according to the scheme, magnesium modified sludge carbon is used for loading denitrification nitrogen removal strains, paracoccus and ochrobactrum are selected for mixing the strains, and the strains and zero-valent iron loaded sludge carbon are compounded and applied to industrial wastewater, so that the denitrification nitrogen removal efficiency is improved, and the actual sewage treatment effect is excellent.

The invention relates to an ore pulp dehydration method based on lepidolite, which comprises the following steps: dehydrating lithium ore pulp through a lithium ore pulp dehydration system to obtain dehydrated lithium concentrate and first filtrate, and recycling the first filtrate; the beryllium ore pulp is dehydrated through a beryllium ore pulp dehydration system, dehydrated beryllium concentrate and second filtrate are obtained, and the second filtrate is recycled; according to the arrangement, compared with a traditional ore pulp dewatering method, the sludge treatment efficiency is improved, and the water content of dewatered sludge is reduced; and meanwhile, the transportation cost is reduced.

The invention provides sludge biochar as well as a preparation process and application thereof, and relates to the technical field of biochar materials. The invention relates to a preparation process of sludge biochar. The preparation process comprises the following steps: S1, conditioning sludge to obtain pretreated sludge; s2, dewatering the pretreated sludge to obtain sludge dewatered sludge cakes; s3, performing pyrolysis treatment on the sludge dewatered sludge cake to obtain the sludge biochar. The obtained sludge biochar is low in environmental risk and high in fertilizer efficiency.

The present application relates to water treatment technical field, and disclose a kind of water plant water purification flocculation precipitation equipment, including shell, the shell is equipped with sedimentation tank and overflow tank, the sedimentation tank is equipped with inclined tube filler, the overflow tank is located in the side of the sedimentation tank, the outside of the shell is equipped with first pipeline and second pipeline, the first pipeline is communicated with the lower side of the sedimentation tank, the second pipeline is communicated with the overflow tank.The present application is by setting sewage mechanism in the lower side of sedimentation tank, including first treatment tank and second treatment tank.Sludge is first settled in first treatment tank, after gathering by mud scraping component, into second treatment tank, by extruding plate to sludge extrusion dewatering, effectively reduce the moisture content of sludge.The volume of dewatered sludge is significantly reduced, facilitating subsequent transportation and disposal, reduce sludge treatment cost, while extruded sewage can be returned to sedimentation tank for reprocessing, improve the utilization rate of water resources.

The invention belongs to the technical field of underground water purification of deep foundation pit engineering, and relates to a system and a method for purifying and recycling underground water of deep foundation pit engineering. The method comprises the six steps of precipitation well pretreatment, rotational flow precipitation coagulation, biological membrane purification monitoring, membrane separation chemical oxidation, sludge dehydration recycling and intelligent monitoring and regulation. According to the invention, organic matters and ammonia nitrogen are synchronously degraded under a bubble-free aeration condition, so that the effluent stably reaches the standard, and the treatment efficiency and the operation stability are improved. Through the synergistic effect of a direct-current electric field and mechanical pressure, a sludge colloid structure is destroyed, water is driven to directionally migrate, sludge is dewatered, dewatered sludge and building waste soil are sintered to prepare ceramsite, secondary dewatered filtrate is subjected to reflux treatment, sludge reduction and recycling and filtrate zero emission are achieved, and efficient recycling of water resources is achieved. The water quality, membrane state and environmental data are collected in real time, the system stability is improved through full-process intelligent control, it is ensured that effluent continuously reaches the standard, and the membrane cleaning period is prolonged through predictive maintenance.

The application discloses high-efficiency aerobic granular sludge and a preparation method and application thereof, and belongs to the technical field of biological wastewater treatment. The application provides high-efficiency aerobic granular sludge and a preparation method thereof. The granular sludge is prepared by taking dewatered sludge with a water content of 60-75% in a wastewater plant as a raw material, and through steps of mud cake crushing, particle size screening, specific gravity air selection and elutriation activation, and has different particle sizes, a specific gravity of 1.04-1.10, a sphericity coefficient of 0.75-0.95, a consistency of 0.50-0.65 and a diameter distance of 1.05-1.50, so that the AGS system can be rapidly started. The high-performance granular sludge can be prepared only by simple processing operation. It has been verified that the granular sludge prepared by the application is added to an aerobic reactor, which helps to achieve the target requirements of rapid starting and stable operation of the AGS system.

According to the technical scheme, the oil removal system is characterized by comprising a gravity oil removal tank, a DAF air flotation device and a dense medium precipitation device which are sequentially communicated, and further comprising a sludge concentration tank, the sludge concentration tank is provided with a first pipe for collecting slag discharged by the gravity oil removal tank and a second pipe for collecting dross of the DAF air flotation device, and the first pipe is provided with a first pipe for collecting the dross of the DAF air flotation device. The sludge concentration tank is provided with a third pipe for collecting sludge of the dense medium precipitation device; the sludge thickening tank is connected with a stacked screw dehydrator; the gravity oil removal tank is provided with a first floating oil collector, and the DAF air floatation device is provided with a second floating oil collector; the second floating oil collector is provided with a floating oil suction part, the floating oil suction part is connected with an oil suction pipe, the oil suction pipe is provided with a rotary filtering assembly for pouring scum into the second pipe, the stacked screw dehydrator is adopted to rapidly dehydrate the sludge collected at all levels, and the recovery efficiency of the dewatered sludge is improved.

The present application belongs to the field of environmental functional materials and water treatment technology, and aims to provide a preparation method of ceramic membrane based on endogenous pore forming and catalysis of sludge containing algae. The method comprises the following steps: taking dewatered sludge of water supply plant in algae outbreak period of water source, drying, ball milling and sieving to obtain sludge powder; soaking and washing after using organic acid with complexing ability as heavy metal removal agent, pre-carbonization treatment, dry pressing into embryo, sintering into membrane sheet; primary activation treatment in weak oxidizing strong acid, washing and heating treatment for secondary activation to obtain ultrafiltration ceramic membrane product. The method is simple in operation steps, easy to implement and green and environmental protection; the prepared ceramic membrane has good separation performance and high mechanical strength, can catalyze oxidizing agent commonly used in water treatment while filtering, and free radicals are generated by decomposition to degrade organic matter; or catalyze common cleaning agent sodium hypochlorite during membrane cleaning to generate free radicals to strengthen the cleaning effect.

The invention discloses a micro-nano ozone pretreatment, dehydration and reduction method for municipal sludge. The micro-nano ozone pretreatment, dehydration and reduction method for municipal sludge comprises the following steps: S1, preparing high-purity ozone gas; s2, preparing ozone micro-nano bubbles from the obtained high-purity ozone gas; s3, dispersing the ozone micro-nano bubbles into the sludge to obtain wall-broken sludge; and S4, dehydrating the wall-broken sludge to obtain dehydrated sludge. Compared with the prior art, the micro-nano ozone pretreatment dehydration reduction method for the municipal sludge has an effective dehydration reduction effect on the sludge, and has economic and environment-friendly effects at the same time.

The invention relates to the technical field of water treatment, in particular to a method for reducing solid waste by treating phosphatized sewage through ternary composite alkali, which comprises the following steps: collecting phosphatized sewage data in real time through an online water quality sensor, inputting a support vector regression model optimized by an improved particle swarm optimization algorithm, calculating the dosage of the ternary composite alkali, and calculating the dosage of the ternary composite alkali. The pH value is adjusted in a segmented adding mode, so that heavy metal ions and phosphate are precipitated in sequence; adding a magnetic micro-nano seed crystal and cationic polyacrylamide in a neutralization reaction to promote the growth of precipitated particles, separating a mixed solution by using a superconducting high-gradient magnetic separator, and carrying out electroosmotic dehydration on the magnetic sludge; finally, mixing the dewatered sludge with sulfuric acid for acid leaching, filtering, adding ammonium bicarbonate to crystallize and separate out calcium hydrophosphate, removing heavy metal ions from mother liquor, and recovering calcium sulfate; the invention aims to solve the problems that the dosage of a medicament is difficult to accurately control and the treatment cost is high and resources are wasted due to water quality fluctuation when phosphating sewage is treated by using the traditional ternary composite alkali.

1. Name of the design product: sludge transport tank truck. 2. Use of the design product: the design product is used for storing and transporting dewatered sludge. 3. Design points of the design product: in shape. 4. Picture or photo best indicating the design points: perspective view 1.

The invention relates to a sludge / biomass mixed drying process, and belongs to the technical field of sludge treatment. Feeding the dewatered sludge, the biomass, the furfural modified diatomite, the isocyanatopropyltriethoxysilane and the stannous octoate into a double-shaft differential mixer, and uniformly mixing; discharging the mixed material from a discharge port of the double-shaft differential mixer, conveying the mixed material to a corrosion-resistant mesh belt conveyor, and uniformly spreading the material on a mesh belt to form a material layer; a hot air drying system is started, a hot air furnace generates low-temperature hot air, and the low-temperature hot air penetrates through a material layer from bottom to top for drying after being distributed through an air duct; wet and hot waste gas generated by drying firstly enters a condensation dehumidification device to remove moisture, then enters a heat recovery device to recover heat, and finally is discharged after being purified to reach the standard; the furfural modified diatomite is prepared from diatomite, absolute ethyl alcohol, furfural and hydrochloric acid; the moisture content of dried materials is low, and the materials are free of caking, uneven drying and the like.

The utility model belongs to the technical field of sludge treatment, and particularly relates to a dewatered sludge treatment device which comprises a material box, a feeding hole is formed in the upper end of the material box, and a screw pump is arranged at the bottom of the material box; the interior of the treatment chamber is divided into an outer chamber and an inner chamber, and an ultrasonic vibration rod is arranged in the inner chamber; the motor group consists of a plurality of motors; a blade is arranged at the head end of each motor and located in the inner chamber, and the motors are located in the outer chamber. Sludge is fed into the inner chamber by the screw pump; the drying unit comprises a loading chamber and a drying chamber; a plurality of layers of tray structures are arranged in the loading chamber from top to bottom; a heating pipe is correspondingly arranged in the drying chamber; a plurality of drying chamber inlets are correspondingly formed in the left side wall connected with the loading chamber; after being filled with sludge, the tray on the uppermost layer in the loading chamber enters the upper part of the heating pipe on the corresponding layer in the drying chamber through the corresponding inlet of the drying chamber to be dried, and then materials are discharged from the outlet of the drying chamber respectively.

This invention discloses a system and method for continuous and efficient hydrolysis of municipal sludge. The system includes a sludge receiving and storage device, a slurry tank, a heat exchange device, a preheating tank, and a multi-stage hydrolysis flash evaporation unit connected in sequence, as well as a product collection unit. The multi-stage hydrolysis flash evaporation unit is connected to the heat exchange device, which is connected to the product collection unit via a condenser. The multi-stage hydrolysis flash evaporation unit includes a primary flash tank, a hydrolysis reactor, and a secondary flash tank connected in sequence. Both the primary and secondary flash tanks are connected to the steam inlet of the heat exchange device. Using this system to hydrolyze municipal sludge, the moisture content of the dewatered sludge cake reaches 17%, which is 43% lower than that of existing technologies. The COD value, ammonia nitrogen value, and total nitrogen value of the sludge hydrolysate are increased by an average of approximately 65% ​​compared to existing technologies. This system has a high degree of automation, good stability, and low operating costs, effectively improving the hydrolysis efficiency and degree of hydrolysis of municipal sludge.

The invention discloses a method for realizing in-situ or ex-situ reduction and dehydration of sludge. Comprising the following steps: step 1, directly placing an ultrasonic transducer in a to-be-treated sludge tank, stirring through a stirrer, and keeping the sludge in a uniformly-mixed state; step 2, performing ultrasonic treatment through high-power ultrasonic transducers which are uniformly distributed in the to-be-treated sludge tank, and crushing cell walls in the activated sludge to enable cell liquid of cells to seep; 3, the sludge subjected to ultrasonic treatment enters a centrifugal dehydrator to be subjected to solid-liquid separation, and dewatered sludge is obtained; and completing the in-situ reduction and dehydration process of the sludge by utilizing the high-power ultrasonic coupling centrifugal separation. As the ultrasonic treatment tank is adopted, the sludge to be treated is fully stirred and uniformly mixed in the tank, the sludge with different sources and water contents can be treated, the external conditions such as water temperature, hardness and pH value are not limited, and the technical application range is wide.

The utility model relates to the technical field of siphoning type sludge concentration systems for mud-water separation, in particular to a siphoning type sludge concentration system for mud-water separation, which comprises a concentration tank, a siphoning mechanism and a cleaning mechanism are arranged in the concentration tank, the siphoning mechanism comprises a mixed liquid feed port, and the mixed liquid feed port is communicated with the cleaning mechanism. The mixed liquid feeding hole is fixedly formed in the front end of the concentration tank, a sludge discharging hole is formed in the outer wall of the concentration tank, a porous collection floral tube is arranged in the concentration tank, and a siphon branch tube is inserted into the porous collection floral tube. The siphoning type mud-water separation sludge concentration system disclosed by the utility model can realize rapid, efficient and continuous enrichment of sludge in a short time, so that on one hand, the sludge in the concentration tank is high in concentration and low in water content, on the other hand, the dosage of a dehydrator can be reduced, the water content of dewatered sludge is reduced, and meanwhile, the transportation cost and the disposal cost are reduced; and the practicability and the efficiency of the device are improved.

The invention relates to the technical field of biological sewage treatment, and discloses an in-situ ultra-deep nitrogen removal method of a mixed nutrition system. The method comprises the following steps: (1) carrying out physical dehydration treatment on anaerobic digestion sludge from an urban sewage plant to obtain sludge with the moisture content of 1t; 80% of dewatered sludge; and (2) putting the dewatered sludge into an anaerobic ammonia oxidation reactor, carrying out in-situ ultra-deep denitrification treatment, and adjusting the dosage of the dewatered sludge according to the nitrate concentration of effluent. Compared with the utilization of an organic carbon source in sewage, the dewatered sludge as a solid carbon source in the method provided by the invention is easy to regulate and control; compared with the traditional landfill and incineration sludge treatment method, the method provided by the invention has the advantages that the dewatered sludge realizes internal circulation in a sewage treatment plant, and sludge recycling is better realized.

The utility model discloses a dewatered sludge sampling device, which comprises: a sampling tube housing, the interior of the sampling tube housing is provided with an accommodating space, and the surface of the sampling tube housing is provided with a sludge discharge port; one end of the sampling tube shell is connected with a concave table, and a fixed through hole is formed in the concave table; the push rod assembly penetrates through the fixing through hole and is arranged in the accommodating space; the push rod assembly is further fixedly connected with a limiting block. The sliding sleeve assembly is installed at the end, close to the limiting block, of the push rod assembly. The bone rod support is installed in the middle of the sliding sleeve assembly, and flexible supporting cloth is installed on the edge of the bone rod support. The dewatered sludge sampling device is simple in structure and convenient to use, dewatered sludge samples can be collected through simple handle push-pull actions, the problem that time and labor are wasted in the operation process is solved, the sampling efficiency is greatly improved, and the sampling continuity and consistency are improved.

The application discloses a system and method for drying sludge in power plants by using exhaust steam waste heat, which comprises a constant-discharge expander, a sludge drying device, a sludge cake crusher, a condensate tank and a steam heat storage unit; the sludge cake crusher is connected with the sludge drying device, the sludge drying device is connected with the condensate tank, and the condensate tank is connected with the steam heat storage unit; the steam heat storage unit is internally filled with heat storage materials; the constant-discharge expander is connected with the steam heat storage unit, and the steam heat storage unit is connected with the sludge drying device; the sludge drying device comprises a shell, a sludge drying device cylinder is arranged in the shell, and a plurality of rotary drying cylinders are uniformly arranged in the sludge drying device cylinder. The application combines boiler constant-discharge exhaust steam recovery treatment and power plant sludge treatment and disposal technology, solves the problems of white feather caused by waste of power plant boiler constant-discharge exhaust steam and equipment corrosion caused by exhaust steam emission, realizes conversion of discontinuous exhaust steam in power plants into stable heat source utilization, and solves the problems of high treatment cost and limited treatment capacity of power plant sludge external transportation.

The invention relates to a method for controlling the addition of a flocculant to a sludge, wherein the sludge is dewatered and images are made of the dewatered sludge and / or the dewatered liquid with a camera system. It is characterised in that the images are evaluated with a computer-implemented computational model that has previously been trained with a training data set, whereby the computational model divides the images into sub-images, classifies them and thus assesses the dewatering of the sludge. Optimal dewatering is achieved with improved ecological and economic efficiency.