1519 results about "Backwashing" patented technology

The invention relates to the technical field of flood purification treatment, and discloses a flood percolation and purification system based on artificial intelligence. A flood data acquisition unit of the system acquires physical characteristics and chemical components of flood in real time, extracts multi-dimensional water quality indexes, identifies pollution concentration abnormal areas through a neural network, and generates an infiltration medium pollution load distribution diagram; a percolation layer state analysis unit calls high-load area data, recognizes percolation layer blockage and saturation segments in combination with historical percolation efficiency, and generates a percolation efficiency attenuation interval; the purification medium regulation and control unit extracts the purification efficiency and the regeneration state according to the attenuation interval, judges the medium failure condition and generates a purification medium dynamic adjustment strategy; and the purification process execution unit calls the regulation and control parameters, detects the pressure change and the pollutant interception amount, identifies the interlayer synergistic effect strength, and generates a purification medium backwashing instruction to control the start and stop of a purification layer high-pressure backwashing pump after reaching the standard.

The invention discloses a filter intelligent backwashing control system based on a pressure sensor, and relates to the technical field of intelligent equipment, and the filter intelligent backwashing control system comprises the following steps: S1, the system firstly executes pressure difference reference initialization, and determines a pressure difference reference value; s2, constructing a corrected differential pressure offset model, and determining the current differential pressure offset of the system; s3, constructing a blockage risk assessment model, and pre-judging whether the system needs to start backwashing or not; s4, carrying out segmented pulse backwashing control; and S5, constructing a closed-loop judgment model, and evaluating the actual backwashing effect of each stage. According to the method, a high-credibility differential pressure reference is obtained through a reference calculation model; the blocking trend is tracked in real time through the moving average pressure difference offset; constructing a blockage risk coefficient fusing the offset, the offset rate and the duration, and judging the flushing opportunity in multiple dimensions; a three-section flow is adopted to distribute flushing strength and duration according to needs; and after each section of pulse is finished, the backwashing effect is evaluated in a closed-loop manner through the closed-loop judgment model.

The invention discloses a regulation and control method for stably improving the water quality of water produced by a reverse osmosis system of a power plant, and relates to the field of water quality regulation and control, which comprises the following steps: configuring a water inlet flow regulation device, performing initial setting, configuring the position of an online sensor, performing data acquisition, setting judgment rules of turbidity, differential pressure and transmembrane pressure difference, and determining the water quality. And configuring a flocculant adding device and adding control logic, configuring a backwashing and adding linkage control state machine, and carrying out data smoothing, trend analysis and self-adaptive threshold adjustment. When the water quality of the raw water fluctuates for a short time or the pollution load is increased, dynamically adjusting the water inlet flow, the backwashing intensity and the flocculant adding concentration based on parameters such as turbidity, pollution index, conductivity and pressure difference which are acquired by an online sensor in real time; and meanwhile, the concentrated water reflux proportion and the high-pressure pump frequency are automatically corrected by continuously calculating the desalting rates of the first-stage and second-stage reverse osmosis devices, so that the running state of the membrane component is kept in an optimal interval.

The invention relates to the technical field of ammonia water preparation, in particular to a raw water reverse osmosis treatment device for ammonia water preparation, which comprises a shell, the shell is formed by fixing an upper shell and a lower shell, a water inlet pipe is fixed in the middle of the top of the shell, a high-pressure water inlet component is arranged at the top of the water inlet pipe, and a concentrated water outlet pipe is fixed in the middle of the bottom of the shell. A drain valve is fixedly mounted at the bottom of the concentrated water outlet pipe; and the water pressure stabilizing assembly is arranged at the top of the inner wall of the shell. A multi-level pressure regulation and control mechanism is constructed in the reverse osmosis process, the problem of instantaneous pressure impact when the high-pressure pump is started is solved, physical damage to the membrane is avoided, a dual anti-blocking system of active rotary cleaning and back flushing is constructed, the membrane blocking probability is greatly reduced, meanwhile, the impact force of water flow is fully weakened in the back flushing stage, and the reverse osmosis efficiency is improved. It is ensured that the reverse osmosis membrane bears stable pressure all the time, and the problem of secondary damage to the reverse osmosis membrane caused by too large instantaneous pressure in the backwashing stage is avoided.

The invention discloses a self-adaptive adjustment magnetic separation-membrane filtration coupling sewage treatment system and a self-adaptive adjustment magnetic separation-membrane filtration coupling sewage treatment method. The system comprises a pretreatment unit, a magnetic separation core unit, a self-adaptive intermediate buffer unit, a membrane filtration unit and a sludge treatment unit which are communicated in sequence. The core of the system is that a plurality of on-line sensors are linked through a central control system, water quality parameters are monitored in real time, the adding amount of magnetic powder and a coagulant, the rotating speed of a stirrer, the membrane flux, the backwashing period and a cleaning program are adjusted in a self-adaptive mode, and intelligent cooperation and accurate regulation and control of magnetic separation and membrane filtration processes are achieved. According to the invention, the problems of easy membrane pollution, high magnetic powder consumption, high operation cost and dependence on manual operation in the traditional process are effectively solved, the service life of the membrane is obviously prolonged, the operation and maintenance cost is reduced, and the effluent quality is stable and meets the high-standard discharge or reuse requirement.

The invention discloses a sewage treatment system and method based on combination of ultrasonic micro-electrolysis and catalytic oxidation, and relates to the technical field of environmental protection, and the method comprises the following steps: sewage is pretreated by generating active free radicals through ultrasonic enhanced micro-electrolysis, and then enters a catalytic oxidation unit to be deeply mineralized together with ozone; the ultrasonic power, the ozone adding amount and the reflux ratio are dynamically adjusted through the fluid circulation and intelligent control unit; and the tail water is fed back through online monitoring to reach the standard. The system integrates an ultrasonic micro-electrolysis module, a catalytic oxidation module, an intelligent control module and an automatic backwashing module, and realizes closed-loop optimized operation. The method solves the problems of low treatment efficiency of refractory organic matters, strong drug dependence, easy damage of equipment, poor adaptability and the like in the prior art, obviously improves the COD removal rate to 95% or above, reduces the energy consumption by 20%, does not need additional drugs, is suitable for high-difficulty wastewater treatment of printing and dyeing, pharmacy and the like, and has the advantages of high efficiency, stability, low consumption and engineering.

The invention relates to the technical field of water treatment equipment, in particular to a coaxial nested ultrafiltration and nanofiltration integrated water purification device and system.The coaxial nested ultrafiltration and nanofiltration integrated water purification device comprises a main shell, and an annular ultrafiltration treatment area and an inner nanofiltration treatment area are coaxially arranged in the main shell. An energy storage adjusting assembly is arranged in the nanofiltration treatment area and comprises an elastic breathing sleeve coaxially arranged outside the nanofiltration membrane assembly in a sleeving mode. The sleeve elastically expands during filtering, so that the effects of buffering pressure and storing energy are achieved; and turbulent flow convex ribs can be arranged on the inner wall of the sleeve, so that the nanofiltration membrane is physically cleaned when the sleeve retracts. Besides, a backwashing pipeline and a valve are arranged, linkage control is carried out when the control unit detects that expansion of the sleeve exceeds the limit, and ultrafiltration produced water stored on the nanofiltration side is reversely pushed by utilizing pressure energy released by retraction of the sleeve so as to backwash an ultrafiltration membrane. According to the invention, the cooperation of pressure buffering, online cleaning of the nanofiltration membrane and energy storage backwashing of the ultrafiltration membrane is realized, the operation is stable, the efficiency is high, and the energy is saved.

The invention relates to the technical field of membrane cleaning, in particular to a ceramic membrane backwashing method, electronic equipment and a storage medium. The invention provides a backwashing method of a ceramic membrane. The backwashing method comprises the following steps: firstly, acquiring process parameters of the ceramic membrane during operation in real time; then analyzing a pollution mechanism based on the process parameters, and calculating a comprehensive pollution degree and a dominant pollution type; then, according to the comprehensive pollution degree and the dominant pollution type, a multi-stage backwashing flow state sequence is matched and generated from a predefined multi-stage flow state strategy library; and finally, aiming at each target flow state in the multi-stage backwashing flow state sequence, respectively generating a corresponding gas pulse control parameter and a corresponding water pulse control parameter, and sequentially executing the gas pulse control parameter and the water pulse control parameter. According to the present invention, the multi-stage flow state control dynamically adapting to the pollution characteristics is adopted to replace the traditional fixed flow state mode, such that the problems of insufficient pertinence and poor backwashing effect caused by the fixed flow state are solved, and the backwashing efficiency of the ceramic membrane is improved.

The invention relates to the technical field of swimming pool filtration, in particular to a composite treatment method of a filter aid for swimming pool filtration, which comprises the following steps: S1, adding the filter aid: adding a powdered activated carbon filter aid into a filter through a feeding pump, and forming an activated carbon filter aid filter cake in the filter; s2, filtering: intercepting or adsorbing impurities when the water in the to-be-treated pond is filtered through an activated carbon filter aid filter cake and a filter, and continuously or intermittently supplementing a powdered activated carbon filter aid in order to maintain the filtering efficiency; s3, backwashing: when the pressure difference of the filter reaches a set value, backwashing is started, and intercepted and adsorbed pollutants and the activated carbon filter aid filter cake slurry are discharged into a drainage system together. The device has the effects of efficiently removing chloramine and other disinfection by-products, peculiar smell, pigment and other pollutants, guaranteeing the water quality safety of the swimming pool and maintaining normal operation of the swimming pool.

The invention relates to a coal chemical wastewater treatment device with nano-catalysis coupled with bioelectrochemistry. The invention belongs to the technical field of coal chemical wastewater treatment. The device comprises a pretreatment area, a bioelectrochemical treatment area, a catalyst recovery area and a clear water area which are connected in sequence, a nano Fe3O4 / TiO2 composite catalyst filling layer and a microporous aeration device are arranged in the pretreatment area; a biological anode region of the biological electrochemical treatment region adopts a graphene modified carbon brush, and a biological cathode region of the biological electrochemical treatment region adopts a sulfur-doped carbon felt; and the catalyst recovery area adopts a high-gradient permanent magnetic roller and is matched with a pulse backwashing system. The treatment cost of each ton of water is reduced to 25-35 yuan, and the cycle life of the catalyst is gt; the time is 200 times; the sulfur can be reused in a desulfurization process of a sewage treatment plant, so that the medicament cost is reduced; the carbon emission is reduced by 60%; the COD removal rate is not less than 95%, the total phenol removal rate is not less than 98%, and the total nitrogen removal rate is not less than 90%; energy consumption is reduced by 40% compared with a traditional electrochemical method, and the catalyst recovery rate is gt; 95%.

The invention discloses a water purification method and system for urban and rural integrated water supply, and relates to the technical field of water treatment. The water purification method for urban and rural integrated water supply solves the problems that an existing system is poor in process adaptability, inaccurate in control and low in energy efficiency. Water quality and pipe network data are collected in real time through a sensor; an adjustable folded plate flocculation device is adopted, and the flocculation effect is optimized in combination with turbidity dynamic adjustment; constructing a multi-parameter dosing model, and dynamically dosing according to flow, turbidity and the like; the LSTM neural network is used for predicting the state of a filter layer, and air-water pulse backwashing is intelligently controlled; and adding a composite flocculant to enhance pollutant removal, and realizing water quality prediction and system collaborative optimization by virtue of a random forest algorithm and a digital twin platform. The flocculation efficiency is improved, dosing is accurately controlled, energy consumption and water resource waste are reduced, and an efficient and stable scheme is provided for urban and rural water supply.

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The utility model discloses a semi-automatic backwashing laminated filter. The external structure of the semi-automatic backwashing laminated filter comprises a handle, a filter base body, a water inlet, a water outlet, a laminated shell, a blow-down valve, a blockage indicator, a filter screen flushing valve and the like, the internal structure comprises a flow direction selector, a butterfly check valve, a laminated filter element, a rotational flow centrifugal disc, a laminated compression inner cover, a laminated compression outer cover, a spring between the laminated compression inner cover and the laminated compression outer cover and the like. The channel position of the flow direction selector is switched by rotating the handle, so that the switching between the filtering mode and the backwashing mode is realized. In a filtering mode, muddy water flows into a raw water cavity outside the lamination after being accelerated by the rotational flow centrifugal disc, impurities are intercepted, and clear water flows into a downstream pipeline; and in a backwashing mode, the water flow is sprayed out from the spraying holes in the filter element frame by pressing the position of the lamination for compressing the inner cover and loosening the lamination, so that impurities are eluted from the lamination and discharged through the blow-down valve. In addition, a filter screen is arranged on the flow direction selector to intercept impurities of flushing water, and the filter screen can be flushed in a filtering mode. The utility model has the advantages of convenient use and simple structure.

The invention relates to the technical field of flow detection, and discloses a pipeline type electromagnetic flowmeter which comprises a mounting pipe body and an electromagnetic flowmeter main body mounted on the mounting pipe body, and further comprises a cylindrical cavity formed in the mounting pipe body, a rotating sleeve is rotationally connected in the cylindrical cavity, the rotating sleeve and the mounting pipe body are coaxially arranged, and the electromagnetic flowmeter main body is arranged in the cylindrical cavity. A rotating assembly for driving the rotating sleeve to rotate is arranged on the mounting pipe body; a partition plate is installed in the rotating sleeve, the partition plate divides the interior of the rotating sleeve into two filtering spaces with semicircular sections, a circular baffle is fixed to the end, close to the electromagnetic flowmeter body, of the rotating sleeve, and a semicircular baffle is fixed to the end, away from the electromagnetic flowmeter body, of the interior of the cylindrical cavity. Through the design of the two filter barrels, when one of the filter barrels is cleaned, shutdown is not needed, water flow filtration and water flow conveying are not affected, and backwashing can be carried out.

The invention relates to the technical field of oil sludge resource regeneration, and discloses a water oil sludge resource regeneration device based on a composite ultrasonic field and application. The device comprises an oil sludge parameter acquisition module, a resonant frequency analysis module, a sound field coupling control module, a phase shift interference analysis module and a separation strengthening execution module. The oil sludge parameter acquisition module acquires a rheological characteristic data set of the oil-containing sludge in real time; the resonance frequency analysis module generates a dual-target resonance frequency parameter based on the data set; the sound field coupling control module drives the piezoelectric transducer array to generate a focused ultrasonic field, and a sound field coupling model is constructed; the phase shift interference analysis module corrects the phase offset of the model and outputs a multi-band sound energy injection sequence; and the separation strengthening execution module regulates and controls the rotating speed gradient of the mechanical centrifugal unit, triggers membrane stack pulse backwashing, and finally generates regenerated base oil and a purified water phase product. According to the device, efficient regeneration of water-oil sludge resources is realized through cooperation of multiple modules.

The invention provides a strong brine zero-discharge circulating cooling water high-salt operation method and system. The method comprises the following steps: S1, pretreating high-efficiency membrane softening produced water and controlling a shunting dynamic ratio; s2, variable parameter closed-loop control and energy consumption optimization of the water supplementing system; s3, multi-variable cooperative regulation and evaporation efficiency improvement of the circulating water system; s4, dynamically adding the high-salt scale and corrosion inhibitor and controlling the uniformity of a concentration field; s5, multi-dimensional data fusion and intelligent decision making of the online detection system; s6, carrying out dynamic flow regulation and energy recovery on the sewage discharge system; s7, carrying out self-adaptive backwashing and efficiency monitoring on the sewage filtering system; s8, double-circulation temperature difference matching and anti-scaling control of the closed cooling system are carried out; s9, simulating multi-working-condition corrosion monitoring and data inversion of the heat exchanger; s10, carrying out the digital twinborn modeling and parameter optimization of the whole system; the method has the advantages of remarkable water-saving effect, energy conservation, consumption reduction, stable operation and good economical efficiency.

The invention relates to the field of nuclear power, in particular to an anion-cation resin treatment method. The method comprises the following steps: pouring the resin in the mixed bed into the anion-cation resin separation filter; carrying out primary scrubbing and backwashing on the resin; feeding all the backwashed resin into an anion resin regeneration filter, and treating the resin by using alkali; part of the resin in the anion resin regeneration filter is fed into an anion and cation resin separation filter, and the resin in the two filters is subjected to secondary scrubbing; feeding the residual resin in the anion resin regeneration filter into an anion-cation resin separation filter, and carrying out secondary backwashing on the resin; judging the height of the resin layer and the interface condition; continuously introducing demineralized water from the top of the anion-cation resin separation filter, and guiding anion resin from the highest outlet in the side surface of the anion-cation resin separation filter to an anion resin regeneration filter; continuously introducing demineralized water from the bottom of the anion-cation resin separation filter, so that anion resin is led out from the highest outlet in the side surface of the anion-cation resin separation filter to an anion resin regeneration filter; and introducing demineralized water from the bottom of the anion-cation resin separation filter in a pulse manner until anion resin is completely discharged. The mixed bed anion and cation resin separation rate of the nuclear power station condensate polishing system is improved, the mixed bed operation period is prolonged, waste water is reduced, and the water quality of steam generator feed water and discharge water is guaranteed.

The invention belongs to the technical field of monocrystalline silicon production, and particularly relates to a single crystal furnace tail gas purification and recovery device which comprises a tail gas collecting pipe, the output end of the tail gas collecting pipe is fixedly connected with a box body, the interior of the box body is divided into a cooling cavity and two filtering cavities through a partition plate, and the two filtering cavities are symmetrically arranged; by arranging the power mechanism, the two gas inlet mechanisms and the impurity removal mechanism can be driven to operate, the two gas inlet mechanisms can input tail gas and backwashing gas into the two filter cavities correspondingly, meanwhile, the filter cavity input with the tail gas can close the connected impurity removal mechanism, and the filter cavity input with the backwashing gas can open the connected impurity removal mechanism; and the two filtering cavities can operate and work at the same time, the tail gas is alternately filtered through the two filtering cavities, therefore, the tail gas can be continuously filtered, and the tail gas recycling efficiency can be improved.

The invention discloses an offshore short-process water treatment and water injection process package based on an efficient coalescence produced water oil removal technology. The short-flow water treatment and water injection process package is structurally characterized in that an inlet of a production water basket filter is connected with a water outlet of an upstream production separator, an outlet of the production water basket filter is connected with an inlet of a production water efficient coalescence separator, and a water outlet of the production water basket filter is connected with an inlet of a water injection filter and an inlet of a water injection buffer tank; the water outlet is connected to a water injection manifold through a water injection booster pump front filter, a water injection booster pump and a water injection pump in sequence; and the other water outlet of the water injection buffer tank is respectively connected to backwashing water inlets of the production water efficient coalescence separator and the water injection filter through a backwashing water pump front filter and a backwashing water pump in sequence. Production water can be treated into qualified injection water through a short process, oil and suspended solids in water of an offshore platform are efficiently removed, and the device has the advantages of being small in occupied area and light in weight and is suitable for being applied to the sea.

The invention relates to the field of leather wastewater treatment, and discloses a leather wastewater multi-stage filtration and recovery treatment system, which comprises a primary treatment tank, one side of the primary treatment tank is fixedly provided with a rough filtration chamber, and the interior of the rough filtration chamber is fixedly provided with an inclined mesh cylinder; a slag conveying pipe which is obliquely arranged is fixedly mounted in the middle of the interior of the mesh cylinder, the tail end of the slag conveying pipe extends to the exterior of the rough filtration chamber, a conveying auger is fixedly mounted on the outer diameter of the rotating shaft, and a slag opening is formed in the side, located in the mesh cylinder, of the top end of the slag conveying pipe; a slag scraping brush is fixedly mounted in the middle of the top end of the mesh cylinder, and a secondary treatment tank is fixedly mounted on the other side of the primary treatment tank. Through three-stage progressive filtration and combination of automatic slag removal and backwashing design, the treatment load is reduced, stable operation of the system is guaranteed, maintenance is simplified, the leather wastewater treatment efficiency and the effluent quality are greatly improved, and efficient recovery is realized.

The invention provides a laminated filter and a lamination thereof, and relates to the technical field of filtering devices.The surface of the lamination is provided with continuous filtering protrusions to form a water inlet groove and a water outlet groove, the water inlet groove is internally provided with a flow guiding protrusion and an intercepting protrusion, and the flow guiding protrusion divides the water inlet groove into a first flow channel and a second flow channel; the intercepting convex part is arranged behind the flow guide convex part to form a baffling section and a sand intercepting section; the flow guide convex part is used for inducing water flow to be divided, and the baffling section and the sand intercepting section are used for realizing ordered deposition of particulate matters and streaming and freewheeling of water flow; according to the structure, on the technical premise of guaranteeing the filtering precision, the head loss is remarkably reduced, the pollutant holding capacity is improved, the industrial technical defects that a traditional laminated filtering device is prone to being blocked and the backwashing frequency is too high are overcome, water resource consumption and energy loss in the backwashing process are reduced, the service life is prolonged, the operation and maintenance cost is reduced, and the working efficiency is improved. An efficient and energy-saving technical scheme is provided for the fields of water treatment, industrial filtration and the like, and powerful support is provided for green and low-carbon transformation of the industry.

The invention relates to an on-line monitoring and melt purification device and method for XLPE insulation material production and a storage medium, the device is integrated on a melt pipeline between an outlet of a main extruder and a die head, and the device comprises an ultrasonic monitoring unit for obtaining ultrasonic characteristic parameters of a melt through ultrasonic scanning; the intelligent purification unit comprises a multi-cavity filter, a switching valve connected with each cavity of the multi-cavity filter, and a backwashing system for cleaning a single filter cavity; and the central control unit is electrically connected with the ultrasonic monitoring unit and the intelligent purification unit, and is used for receiving the monitoring data, carrying out intelligent judgment and sending out a control instruction. The ultrasonic monitoring unit achieves on-line monitoring of the melt impurity concentration, through cooperation of the multi-cavity filter and the switching valve, on-line uninterrupted switching of filtering cavities is achieved, meanwhile, a filter element is cleaned in time through the backwashing system, and the purity of an XLPE insulating material and the product reliability are effectively improved.

The invention relates to the technical field of industrial process intelligent analysis, in particular to a method and system for monitoring the regeneration process of make-up water resin, and the method comprises the steps of monitoring backwashing, water filling, layering and regeneration processes through images and sensing signals, judging a reaction endpoint, calculating the optimal regeneration duration and outputting a monitoring result. The expansion height and layering texture features of a resin bed are captured through machine vision, the physical form is accurately fed back to avoid resin loss and guarantee the layering effect, the gas-liquid phase change moment is sensitively captured through the frequency shift characteristic of vibration frequency, the filling degree of a tank medium is guaranteed, and the contact efficiency is improved. According to the method, the concentration trend and the conductivity variance are analyzed in combination with least square regression, the chemical equilibrium endpoint of the ion exchange reaction is intelligently recognized, the optimal operation duration is calculated by applying nonparametric trend inspection, data driving in the regeneration process is achieved, and the agent consumption and the time cost are remarkably reduced on the premise that the effluent quality is guaranteed.

The utility model relates to an aeration backwashing device for reducing blockage of a percolation tank of a constructed wetland. The device comprises a pore plate, a first backwash main pipe, a first backwash branch pipe, a second backwash main pipe and a second backwash branch pipe, a percolation tank is separated by the pore plate, the upper layer is a percolation layer, the lower layer is a drainage layer, the first backwash main pipe is mounted below an aeration main pipe, and the second backwash main pipe is mounted below the aeration main pipe. First backwash branch pipes corresponding to the aeration branch pipes are uniformly arranged on the first backwash main pipe, exhaust holes are uniformly formed in the first backwash branch pipes, and the first backwash main pipe is connected with air supply equipment through a second air supply pipe; the second backwash main pipe is mounted at the drainage layer, second backwash branch pipes are uniformly arranged on the second backwash main pipe, drainage holes are uniformly formed in the second backwash branch pipes, and the second backwash main pipe is connected with water supply equipment through a water supply pipe. According to the scheme provided by the invention, the percolation layer can be backwashed in a water-gas combination manner, and the blockage clearing effect on the percolation layer is ensured.

The invention discloses a circulating water blow-off water reuse treatment system, and relates to the field of circulating cooling water treatment, the system comprises: an induced crystallization unit, which is used for carrying out primary treatment on circulating water blow-off water through an induced crystallization fluidized bed reactor to remove hardness ions in water; the ceramic membrane filtering unit is used for carrying out secondary treatment on the primarily treated water by utilizing a ceramic membrane device and removing residual hardness ions, organic matters and suspended matters in the water; and the nanofiltration membrane unit is used for performing tertiary treatment on the water by utilizing a nanofiltration membrane according to the secondary treatment result to remove salt and organic matters in the water. According to the method, induced crystallization, ceramic membrane and nanofiltration membrane technologies are combined to cooperatively treat the circulating water and the blow-down water, so that the operation mode of simplifying the process, reducing the energy consumption and prolonging the backwashing period is realized, the dosage of chemicals and the generation of sludge are reduced, and the water recovery rate is also improved, so that the hardness is removed, and the calcium resource recovery is realized.

The invention provides a mother liquor recycling device in an aluminum oxide production process, and relates to the field of aluminum oxide production, the mother liquor recycling device comprises a filter plate with a filter layer capable of translating outwards during backwashing, and a plurality of scrapers are arranged on the filter plate in the direction facing the outer side surface of the filter layer; by arranging the filter plate capable of translating outwards, when the filter plate is subjected to backwashing cleaning, the pressure of backwashing cleaning liquid is utilized to push the filter layer to translate outwards, and the scraper blade is used for automatically cleaning the filter layer, so that the filter layer is prevented from being scraped, and the cleaning efficiency is improved. The cleaning effect on the filter plate in the backwashing process can be effectively improved, the downtime of equipment is reduced, and the production efficiency is improved.

The invention provides a ceramic membrane filter, an electroplating liquid filtering and purifying system and a purifying method thereof, and belongs to the technical field of filtering devices. The ceramic membrane filter comprises a filter shell internally provided with a plurality of ceramic membrane pipes, a connector, a water inlet pipe and a water collecting pipe. The purification system comprises a plating tank, a carbon liquid mixer and the ceramic membrane filter. The ceramic membrane filter, the purification system and the in-situ backwashing system are adopted to replace a traditional wire-wound filter element, the problems that the traditional filter element is low in precision, non-reusable, much in solid waste and high in cost are solved through high-precision filtration and membrane in-situ regeneration, manual operation is reduced to the maximum extent, the labor cost is reduced, solid waste and secondary pollution are avoided, and the method is suitable for industrial production. The advantages of high efficiency, stability, low maintenance and environmental protection are realized.

The invention discloses a heterogeneous Fenton-like catalyst, a preparation method, a reaction device and a pretreatment method thereof. According to the catalyst, high-iron-content ash is used as a base material, porous magnetic particles of 3-5 mm are prepared through biomass reduction, magnetic separation enrichment, bonding granulation and roasting, the specific surface area is 200-300 m < 2 > / g, and the porosity is 70-80%. The device is of a closed vertical three-area structure, a pipeline mixer and a tangential nozzle are adopted to form rotational flow, and a gas collecting hood collects waste gas and is provided with a backwashing loop from bottom to top. During operation, H2O2 is added according to 1-1.5 times of the COD (Chemical Oxygen Demand) of inlet water under the nearly neutral condition that the pH value is 5-7, and the catalyst stays for 30-60 minutes, so that high-salt high-chlorine refractory organic wastewater can be efficiently degraded, iron mud can be reduced, backwashing and recycling are easy, the operation cost is reduced, and the method has engineering popularization value and is stable and reliable in operation.

The invention relates to a centrifugal filtration device for solid-liquid mixed liquor. The filtering device comprises a rack, a liquid inlet channel and a filter, the filter is provided with a filter cartridge capable of rotating around a supporting structure, a collecting shell and a backwashing nozzle are arranged outside the filter cartridge, and a residue receiving container and a residue discharging channel are arranged inside the filter cartridge. Waste liquid is injected into the filter cartridge through the liquid spraying pipe, the filter cartridge rotates to generate centrifugal force, the liquid and fine particles are pushed to be thrown out, separated through the filter screen and collected to the clean liquid water tank, and large particle impurities are attached to the filter screen, removed through the back-flushing spraying head and finally guided out through the residue receiving container and the residue discharging channel. And the discharged impurity mixture flow is further subjected to liquid separation through a two-stage vibrating screen and is subjected to reflux treatment, and solid residues are collected in a centralized manner.

The invention relates to the technical field of sewage treatment, in particular to an assembly type stacked hydraulic grit chamber for a sewage treatment plant. The assembly type stacked disc hydraulic grit chamber for the sewage treatment plant comprises a stacked disc module device, an unpowered water distribution device and a backwashing and fluidizing device, the stacked disc module device comprises a plurality of stacked discs which are sequentially arranged at intervals in the vertical direction, a water outlet channel is formed between every two adjacent stacked discs, and a water outlet is formed in the inner side of each stacked disc. According to the assembly type stacked disc hydraulic grit chamber for the sewage treatment plant, water flow is sprayed to the inner surface of the stacked disc through the cleaning disc assembly so as to wash the inner surface of the stacked disc, the automatic backwashing function is achieved, the problem of sand accumulation of the stacked disc is effectively solved, and sand hardening is prevented. Through the automatic backwashing function, the manual cleaning frequency and strength are greatly reduced, the manual labor intensity and potential safety hazards are reduced, the stacked trays are prevented from being blocked, and the service life of the stacked trays is prolonged.