682results about How to "Reduce secondary pollution" patented technology

The invention discloses a method for inhibiting leaching of beryllium in lithium smelting slag, and the method comprises the following steps: mixing a curing and stabilizing agent and the lithium smelting slag in a ball milling manner, and enabling the leaching concentration of beryllium in the treated lithium smelting slag to meet the national standard; the treatment method can be directly carried out on the basis of the existing lithium smelting process flow; the curing and stabilizing agent comprises a calcium-containing compound; the calcium-containing compound comprises at least one of calcium phosphate, calcium sulfate, calcium carbonate and calcium hydroxide. Based on a compound beryllium fixing principle of lattice substitution and adsorption, after the medicament is used for treating the beryllium-containing lithium smelting slag, beryllium in the treated lithium smelting slag can be stably cured. Besides, the curing and stabilizing agent can be common industrial solid waste, is wide in raw material source, simple to operate, remarkable in effect and easy to realize large-scale application, treats waste with waste and has important significance on harmless treatment and resource utilization of the high-toxicity lithium slag.

The invention belongs to the technical field of environmental sanitation machinery, and particularly relates to a high-speed low-noise centrifugal fan with an air filtering effect, the high-speed low-noise centrifugal fan comprises a fan volute, a fan impeller is mounted in the fan volute, the fan impeller comprises a front disc, a middle disc and a plurality of fan blades, the fan blades are located between the front disc and the middle disc, and the fan blades are arranged in the fan volute. A flow channel of the fan impeller is formed by the front disc, the middle disc and the space between every two adjacent fan blades, and a driving motor is installed on the rear side of the fan volute. According to the high-speed low-noise centrifugal fan with the air filtering effect, brand new plans are made on the blade shape, the blade structure, the volute, the volute tongue and the overall structure of the fan, and particularly, the cyclone separator is additionally arranged at the air inlet of the fan, so that high-speed air entering the volute of the fan is rapidly separated and purified; and dust and other garbage in the gas are settled and separated, so that the quality of air discharged into the atmosphere from an outlet of the fan is improved, and secondary pollution of environmental sanitation operation is reduced.

The invention discloses a treatment device and process based on zero discharge of high-concentration coating wastewater, wastewater passes through an adjusting tank and then enters a pretreatment module through a pipeline, the coating wastewater passes through a Fenton tank body, a coagulation tank body and a primary sedimentation tank of the pretreatment module in sequence through the pipeline to be treated, and the coating wastewater is continuously conveyed to a biochemical treatment module; the biochemical treatment module is used for carrying out anaerobic environment treatment through an anaerobic granular sludge bulking bed and then carrying out aerobic environment treatment through an aerobic aeration tank; and introducing the wastewater into a secondary sedimentation tank to separate the formed sludge from water, entering a biochemical tank, carrying out ultrafiltration and reverse osmosis treatment through a deep treatment module, recycling the treated wastewater to a production line, and recycling the generated condensate water and RO fresh water. The adopted wastewater treatment device is combined and optimized by various advanced technologies, so that the treatment efficiency and the water quality are improved, efficient recovery and reutilization of resources are also realized, and the system has good economic benefits and environmental benefits and is suitable for the requirements of modern coating wastewater treatment.

The invention relates to an organic wastewater photocatalytic rotational flow enhanced hydrogen production method and device, and provides an organic wastewater photocatalytic rotational flow enhanced hydrogen production method, which comprises the following steps: (A) shear oscillation mixing of a catalyst and wastewater, (B) wastewater rotational flow oscillation photocatalytic hydrogen production, and (C) gas-liquid-solid three-phase separation and catalyst reuse. The invention further provides an organic wastewater photocatalytic rotational flow enhanced hydrogen production device. Organic matter pollutants in water are decomposed under the action of the catalyst, chemical energy of the organic matter pollutants is recycled in the form of hydrogen, cooperation of wastewater photocatalytic hydrogen production and wastewater treatment is achieved, the reaction rate of wastewater photocatalytic hydrogen production is increased, and secondary pollution caused by the reaction catalyst is avoided.

The invention relates to an efficient catalytic composite nano-capture deep deodorization method for waste gas with complex components, which is applied to the field of purification of waste gas with complex components, and comprises the steps of pretreatment of gas inlet, catalytic enrichment, nano-liquid capture and the like, and through the synergistic effect of a catalytic enrichment coupling reactor, an atomizing nozzle, nano-liquid and an intelligent deodorization control system, the deodorization effect of the waste gas with complex components is improved. VOCs and odor molecules in the malodorous gas can be efficiently and rapidly removed, the human body is free of feeling, the whole deodorization process is carried out under the normal temperature condition, the investment and operation cost for malodorous gas treatment is remarkably reduced, and the deodorization method has the advantages of being high in safety, low in operation cost, small in occupied space, low in secondary pollution and the like and is suitable for popularization and application. According to the method, the practical application effect of malodorous gas treatment is effectively improved, the safety of discharged gas is ensured by evaluating the treated gas, and the application effect and quality of the catalytic enrichment coupling reactor and the nano liquid can be monitored and adjusted in real time, so that the intelligent level of the malodorous gas treatment process is enhanced.

The invention discloses a method for degrading dioxin in fly ash and stabilizing heavy metals, which comprises the following steps: carrying out water washing treatment on the fly ash, and carrying out solid-liquid separation to obtain water washing slag; mixing the washed slag with water, adding zero-valent iron and sulfite, carrying out hydrothermal treatment, and carrying out solid-liquid separation to obtain hydrothermal slag and hydrothermal liquid; according to the method for degradation of dioxin in fly ash and stabilization of heavy metal in cooperation with degradation of dioxin in fly ash, under the combined action of zero-valent iron, chlorite and a hydrothermal environment, efficient degradation of dioxin in fly ash can be rapidly achieved under the lower reaction condition, stabilization of heavy metal in fly ash can be synchronously achieved, and the method is suitable for industrial production. The method has the advantages of being low in cost, mild in reaction condition, high in treatment efficiency, good in treatment effect, environmentally friendly and the like, can effectively solve the problems existing in the prior art, provides powerful support for harmless treatment and resource utilization of the waste incineration fly ash, and has wide engineering application prospects.

The invention relates to a process for gradient extraction of seaweed protein, algin and fucoidin in brown algae. The invention relates to a process for extracting seaweed protein, algin and fucoidin in brown algae, which comprises the following steps: carrying out superfine grinding on seaweed, adding water for extraction, filtering and separating to obtain water extraction filtrate, repeatedly dissolving the water extraction filtrate in the next batch of superfine ground seaweed, and circulating for 7 times to obtain saturated or supersaturated water extraction filtrate; adjusting the pH value of the water extraction filtrate to be acidic, and filtering and separating through a micro-filtration membrane to obtain seaweed protein and first filtrate; adding calcium chloride into the first filtrate, and settling to obtain algin and supernate; filtering the supernate through a polyethersulfone composite membrane to obtain a fucoidin concentrated solution; and carrying out spray drying on the concentrated solution to obtain fucoidin powder. The method solves the problem that other functional components are wasted due to the fact that only a single component can be extracted in an existing brown algae functional component extraction method, and also solves the problems of secondary pollution, poor product quality and high cost in an existing extraction method.

The invention discloses a desliming device for mining and beneficiation operation, and relates to the technical field of mineral engineering, in particular to a desliming device for mining and beneficiation operation, which comprises a main machine body, a U-shaped groove is attached and connected to the top of the main machine body, and a flow dividing box is arranged at one end of the main machine body; and a hydrocyclone is arranged between the main machine body and the flow dividing box. According to the desliming device for mining and beneficiation operation, fine separation of minerals with different densities and particle sizes is achieved through stirring of the U-shaped groove, screening of the sieve plate, separation of the hydrocyclone and extrusion of the mesh belt, the desliming quality is improved, finally, final solid-liquid separation is achieved through relative movement and extrusion of the upper mesh belt and the lower mesh belt, and the desliming efficiency is improved. By means of the device, it is ensured that substances in different phase states are separated and treated according to an expected mode, the convenience and the environmental protection property of subsequent treatment are improved, the problem that silt is difficult to clean in traditional equipment is solved through the convenient cleaning mode of all the parts, and the fault risk and secondary pollution caused by silt residues of the equipment are reduced.

The invention provides a method for cyclically regenerating a positive electrode active material by using magnesium sulfate, which comprises the following steps: 1) burdening and mixing waste lithium battery black powder, magnesium sulfate and a carbon source, and roasting the mixture in a vacuum or inert atmosphere to obtain a roasted product; (2) adding the roasted product into water to carry out water leaching treatment, and carrying out suction filtration to obtain a lithium sulfate solution and water leaching residues; 3) adding the lithium sulfate solution into the saturated sodium carbonate solution for lithium precipitation to obtain a lithium carbonate precipitate; (4) drying the water leaching residues, adding dilute sulphuric acid to carry out acid leaching treatment, filtering to obtain acid leaching residues and a magnesium sulfate solution, and then carrying out evaporative crystallization treatment on the magnesium sulfate solution to obtain a magnesium sulfate precipitate; 5) mixing the acid leaching residues with lithium carbonate, and sintering to obtain the regenerated ternary positive electrode active material.According to the method, the recovery rate of obtained lithium reaches 99% or above, loss of important elements in the regeneration process can be avoided, cyclic utilization of magnesium sulfate is achieved, and consumption of chemical reagents and secondary pollution are reduced.

The invention discloses a process for treating rural domestic sewage by using an improved A2 / O + MBBR (Moving Bed Biofilm Reactor), and relates to the technical field of sewage treatment. The method comprises the steps of S1, initial-stage treatment, S2, reflux treatment and S3, tail-stage treatment. The rural domestic sewage is treated by an improved A2 / O + MBBR nitrogen and phosphorus removal process, and the rural domestic sewage is distributed into each tank by adopting a sectional water inlet technology, so that an alternate multi-stage facultative / aerobic environment is formed, and the biological nitrogen and phosphorus removal effect is enhanced; the improved A2 / O + MBBR process has the advantages of high nitrogen and phosphorus removal effect, low investment and operation cost, convenience in operation and management and the like; all returned sludge enters the pre-denitration tank and enters the front-section anaerobic tank and the front-section anoxic tank, a sludge concentration gradient from high to low is formed in each tank, and the average sludge concentration in each tank is increased and the hydraulic load of the sedimentation tank is not changed under the condition that the effluent sludge concentration is not increased, so that the proliferation speed of phosphorus-accumulating bacteria and nitrifying bacteria is accelerated; the proportion in the total amount of the activated sludge is increased, so that the nitrogen and phosphorus removal effect is improved.

The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic power generation device adaptive to illumination angle adjustment, which comprises a plurality of mounting frames, one side wall of each mounting frame is provided with a T-shaped groove, the other side wall of each mounting frame is fixedly provided with a T-shaped block, and the adjacent T-shaped blocks are matched with the T-shaped grooves in an inserted manner. The top surfaces of the mounting frames are rotatably connected with photovoltaic power generation panel bodies through hinge shafts, overturning assemblies are fixedly arranged in the middles of the mounting frames, protective blocks are arranged on the overturning assemblies, the mounting frames are mounted on the top surfaces of tripods, supporting pieces are fixedly arranged on the bottom surfaces of the tripods, and the lower ends of the supporting pieces are rotatably connected with bases; wherein a cleaning assembly is arranged on one mounting frame, and a cleaning roller is arranged on the cleaning assembly. The number of the photovoltaic power generation panel bodies can be conveniently increased or decreased to adapt to power generation requirements of different scales, assembly, disassembly and maintenance of the photovoltaic power generation panel bodies are facilitated, the use convenience and flexibility are improved, and the operation cost is reduced.

The invention relates to a synchronous grouting material based on muddy silt shield muck and a preparation method thereof, and the synchronous grouting material comprises the following raw materials in parts by weight: 13 to 16 parts of cement, 16 to 20 parts of slag, 142 to 147 parts of fine sand containing silt powder, 0.03 to 0.1 part of trimethylsilyl ethyl acetate, 0.07 to 0.17 part of disodium hydroxyethylphosphonate, 0.03 to 0.1 part of pentasodium amino trimethylene phosphonate and 63 to 67 parts of water. According to the invention, the fine sand containing mud powder is used as a main raw material to replace bentonite and fine sand in synchronous grouting in the prior art, and is combined with a specific cement additive, so that the compressive strength and the impermeability of the synchronous grouting material are effectively improved through the synergistic effect of the components, local materials can be used, and the outward transportation and disposal cost of a large amount of muck can be greatly reduced.

The invention relates to a method for treating ammonia-nitrogen wastewater based on photocatalysis and ozonation coupling, and belongs to the technical field of wastewater treatment.The method comprises the following steps that S1, early-stage preparation is conducted on wastewater treatment; s2, photocatalytic ozone oxidation coupling treatment; s3, wastewater effluent treatment; s4, regeneration and recovery of the catalyst; and S5, monitoring the effluent quality of the wastewater. According to the method for treating the ammonia-nitrogen wastewater based on photocatalysis and ozonation coupling, the ammonia-nitrogen wastewater is treated by adopting the wastewater treatment method, so that the degradation efficiency of ammonia nitrogen can be effectively improved, and ammonia nitrogen components in the wastewater can be more effectively removed; in the photocatalytic reaction process, pollutants are decomposed into harmless substances, so that the problem of secondary pollution is avoided; in the ozone oxidation process, ozone can be quickly decomposed, the influence on follow-up treatment facilities is reduced, meanwhile, light energy is utilized in the photocatalytic reaction, the advantages of energy conservation and environmental protection are achieved, and the advantages of efficient degradation, no secondary pollution, energy conservation and environmental protection are achieved.

The invention belongs to the technical field of environment-friendly treatment of high-concentration organic wastewater, and particularly relates to a wet catalytic oxidation treatment process for high-concentration organic wastewater. Wastewater in the wet catalytic oxidation treatment process for the high-concentration organic wastewater is formed by combining a plurality of streams of wastewater. In order to ensure the safety of the wet oxidation process, the combined wastewater is firstly subjected to steam stripping pretreatment to remove light component organic matters therein, then is pressurized and heated, enters a wet oxidation reaction section to remove most of COD therein, is cooled and depressurized after the reaction is finished, and is fed into the existing multi-effect evaporation section; the multi-effect evaporation concentrated solution is returned to the wet oxidation section to continuously remove organic matters, and condensate water enters a subsequent biochemical treatment section. The wet catalytic oxidation treatment process for the high-concentration organic wastewater is wide in application range, high in treatment efficiency, high in oxidation speed and low in secondary pollution.

The invention discloses a bottom-attached tunnel desilting device and desilting method based on the pulsed jet ground breaking effect, the bottom-attached tunnel desilting device comprises a crawler-type advancing module, a connecting frame, a desilting module and a conveying pipeline, the connecting frame is fixed on the front side of the crawler-type advancing module, and the conveying pipeline comprises a negative pressure water pipe and a high pressure water pipe; the jet module comprises a signal processing system, a high-precision sensor, a high-pressure water pump, a pulse controller and a steering engine; the suction module comprises a sludge inlet box, a connecting rod structure, a brush and a spiral centrifugal pump; through the innovative pulse jet technology, the self-circulation system and the terrain self-adaption design, an efficient, energy-saving and stable operation mode can be provided in the tunnel desilting process, and the tunnel desilting device has high environmental adaptability and is suitable for tunnel desilting operation of various complex terrains.

The invention discloses a cleaning element replacing device, a base station and an automatic cleaning system, and belongs to the technical field of automatic cleaning.The cleaning element replacing device comprises a transmission device and a driving assembly, the transmission device is used for making contact with a cleaning element, and the output end of the driving assembly is connected with the transmission device; the driving assembly drives the cleaning element to move through the transmission device so that the cleaning element can enter or move out of the base station. The driving assembly drives the cleaning element to move through the transmission device, so that automatic position switching of the cleaning element inside and outside the base station is achieved, the cleaning element is arranged outside the base station, airing is convenient, bacterium breeding is reduced, the cleaning element automatically moves into the base station, follow-up automatic cleaning equipment is convenient to replace, time and labor are saved, and the cleaning efficiency is improved. According to the cleaning device, the replacement frequency of the cleaning elements can be increased, residual stains on the cleaning elements can be reduced, the cleaning elements made of different materials can be replaced, targeted cleaning can be conducted according to different scenes, the space occupancy rate is small, power modules are reduced, and the cost is reduced.

The utility model aims to provide the cleaning line for slicing the silicon wafer, which is simple in structure, energy-saving, environment-friendly and low in cost. According to the utility model, the cleaning part comprises the bubble water generator, the cleaning part comprises the plurality of cleaning tanks, and the silicon wafer slices are sequentially placed in the plurality of cleaning tanks to be cleaned; the plurality of cleaning tanks are sequentially a primary cleaning tank (1), an ultrasonic normal-temperature cleaning tank (2), a normal-temperature bubble water cleaning tank (3), a bubble water soaking cleaning tank (4), a first weak base water cleaning tank (5), a second weak base water cleaning tank (6) and a plurality of pure water rinsing cleaning tanks which are sequentially arranged; the bubble water generator inputs bubble water into the normal-temperature bubble water cleaning tank (3) and the bubble water soaking cleaning tank (4), and quantitative weak base water is added into the first weak base water cleaning tank (5) and the second weak base water cleaning tank (6). The utility model is applied to the field of cleaning equipment.

The invention provides an efficient power battery disassembly tail gas treatment system which comprises a tail gas conveying pipeline for conveying tail gas, a bag-type dust collector for receiving the tail gas conveyed by the tail gas conveying pipeline, a condensing tower for receiving the tail gas exhausted by the bag-type dust collector, a combustion furnace for receiving the tail gas exhausted by the condensing tower, and an alkali wash adjusting tower for receiving the tail gas exhausted by the combustion furnace, the quench tower is used for receiving tail gas exhausted by the alkali washing adjusting tower, the water spraying device is used for receiving the tail gas exhausted by the quench tower, and the active adsorption box is used for receiving the tail gas exhausted by the water spraying device. Through comprehensive application of various technologies such as adsorption, catalytic combustion and condensation recovery, comprehensive and efficient purification treatment of harmful substances in the power battery disassembly tail gas is realized; and the energy consumption and the cost in the treatment process are reduced in manners of recycling valuable organic solvents and the like.

The invention discloses an in-situ self-condensing hydrogel based on hydrothermal carbonization synthesis and a preparation method thereof, belongs to a water retention material in an ecological restoration technology and an in-situ self-condensing technology, and aims to solve the technical problems of high energy consumption and serious environmental pollution during hydrogel preparation in the prior art. The preparation method comprises the following steps: preparing modified hydrothermal carbon filtrate, N, N '-methylene bisacrylamide, acrylamide and ammonium persulfate; the modified hydrothermal carbon filtrate comprises plant powder, sodium hydroxide and urea; the preparation method comprises the following steps: weighing sodium hydroxide and urea, and dissolving to obtain a mixed solution; weighing plant powder, pouring the plant powder into the mixed solution, uniformly mixing, reacting and carrying out suction filtration to obtain modified hydrothermal carbon filtrate, so as to obtain a mixture 1; uniformly mixing N, N '-methylene bisacrylamide, acrylamide and the mixture 1, adding ammonium persulfate, uniformly mixing to obtain a mixture 2, reacting the mixture 2 at normal temperature, washing, and drying to obtain the in-situ self-condensing hydrogel.

The ozone membrane and ozone ultraviolet combined catalytic oxidation device comprises a base, the two sides of the upper portion of the base are connected with the two sides of the lower portion of a lower shell in a fastened mode through matching of fastening bolts and nuts, and the upper portion of the lower shell is integrally connected with an upper shell. The two sides of the upper portion of the upper shell are in fastened connection with the two sides of the end cover through cooperation of fastening bolts and nuts, a center pipe is longitudinally arranged in the center of the interior of the lower shell and the upper shell after the lower shell and the upper shell are integrally connected, a PTFE hollow fiber membrane is arranged on the outer portion of the center pipe in the circumferential direction, and casting areas are arranged at the upper end and the lower end of the PTFE hollow fiber membrane correspondingly. An ozone channel is arranged between every two adjacent PTFE hollow fiber membranes, a membrane oxidation gas-water mixing outlet is formed in the corresponding position of the central pipe below the PTFE hollow fiber membranes, an ultraviolet generator is arranged above the central position in the central pipe, and the top end of the ultraviolet generator penetrates through an end cover and is fixed on the end cover through a fastening bolt; and the top of the ultraviolet generator is connected with an ultraviolet generator power supply.

The invention relates to the related technical field of soil pollution remediation, and discloses a soil pollution treatment system and method and application thereof, and the system comprises a multi-dimensional dynamic monitoring module which is used for collecting soil temperature, humidity, pH value, organic pollutant concentration and heavy metal concentration in real time; the data analysis and trend prediction module is used for dynamically predicting the pollution diffusion trend based on the pollution diffusion and reaction kinetic model; the repairing agent intelligent regulation and control module dynamically adjusts the type and proportion of a repairing agent according to the pollution type and concentration; the precise remediation module adopts a negative pressure extraction technology and a high-pressure injection technology and is used for realizing remediation of soil at different depths; the intelligent feedback and optimization module is used for monitoring a repair process and adjusting a repair strategy in real time; the following effects can be realized: pollution distribution and diffusion paths are evaluated in real time; dynamically optimizing the dosage and proportion of the repairing agent; synchronous restoration of organic matters and heavy metals is realized; secondary pollution is reduced, and the sustainable utilization capability of the soil is improved.

The invention discloses a kitchen waste pretreatment device, system and method, and relates to the technical field of kitchen waste treatment.The kitchen waste pretreatment device comprises a vibration conveying platform, under cooperation of a transmission coherence assembly, a multi-stage bevel gear transmission structure and a speed regulator are adopted, the stability and reliability of equipment operation are guaranteed, the transmission efficiency is improved, and energy consumption is reduced; and through linkage of an external PLC, parameters of crushing and drying links are automatically adjusted, efficient treatment of different garbage types is ensured, energy use is optimized, preliminary screening can be performed through an external pretreatment screening machine according to natural differences of garbage sizes and densities, the pressure of subsequent treatment links is relieved, the efficiency and precision of the whole process are improved, and the production cost is reduced. Further, under the cooperation of a high-definition camera shooting end and a visual inspection sensor, the grabbing mechanical arm is assisted by spectral analysis of a top puncture detection structure, the garbage type is effectively judged, misclassification is reduced, automatic operation is achieved, manpower dependence is reduced, and operation safety and continuity are improved.

The invention discloses a method for producing biogas through anaerobic fermentation of straws, and belongs to the field of solid waste treatment, the method comprises the following steps: carrying out hydrothermal pretreatment on the straws to obtain a solid-liquid mixture, and carrying out anaerobic fermentation on the solid-liquid mixture by taking sludge as an inoculum to produce biogas. Straw and polylactic acid are potential high-quality fermentation substrates and are converted into biogas through anaerobic fermentation, so that the utilization rate of waste is increased, and secondary pollution to the environment is reduced.

The invention provides high-flame-retardant high-temperature-resistant automotive interior leather which comprises a polyolefin base material layer and a surface coating, the polyolefin base material layer comprises a mixture composed of 10-90 parts by weight of ethylene copolymer elastomer and 10-90 parts by weight of ethylene-propylene-diene monomer, and the sum of the parts by weight of the ethylene copolymer elastomer and the ethylene-propylene-diene monomer is 100; and 0.1-5 parts by weight of an assistant cross-linking agent, wherein the assistant cross-linking agent comprises a flame-retardant assistant cross-linking agent. The automotive trim leather provided by the invention has good mechanical properties, temperature resistance, high flame retardance, aging resistance, environmental protection and the like, and is simple in process and low in cost.

A sundry blocking and collecting device comprises a sundry collecting assembly installed on a dust removal pipeline, the sundry collecting assembly comprises a sundry collector, and a first pneumatic valve connected with the dust removal pipeline is installed on a dusty air inlet of the sundry collector; a second pneumatic valve connected with the dust removal pipeline is mounted on the dusty air outlet; an impurity outlet is formed in the end close to the dust-containing air inlet; the impurity outlet is connected with a filter material barrel, and an impurity inlet of the filter material barrel is provided with a third pneumatic valve; a fourth pneumatic valve is mounted at an impurity outlet of the filter drum; an air cannon blowback inlet is formed in the end close to the dusty air outlet, an air cannon blowback valve is installed on the air cannon blowback inlet, and the air cannon blowback valve is connected with an air cannon; and a sundry blocking component is arranged below the air cannon reverse blowing inlet in the sundry collector. According to the utility model, the impurities in the raw material ore in the mine production process are effectively intercepted and collected, the performance of the dust remover is improved, the service life of the dust remover is prolonged, the maintenance cost is reduced, the environmental pollution is reduced, and the dust remover has obvious environmental protection benefits.

The invention relates to the technical field of cleaning equipment, and discloses a spraying arm, a dish-washing machine and a control method of the dish-washing machine, the spraying arm comprises a spraying arm main body and a drainage structure, the top of the spraying arm is provided with a water inlet, and the spraying arm main body is internally provided with a water flow channel communicated with the water inlet; a lower spraying hole communicated with the water flow channel is formed in the bottom of the spraying arm main body; the bottom face of the water flow channel is provided with an annular protruding part surrounding the lower spraying hole by a circle. The drainage structure comprises a drainage opening and a blocking piece, the drainage opening is formed in the bottom face of the water flow channel, and the blocking piece is located at the drainage opening. The plugging piece is provided with a closing position and a drainage position, and the drainage opening is closed by the plugging piece at the closing position; and at the drainage position, the plugging piece does not close the drainage opening. According to the spraying arm, the annular protruding part is arranged on the periphery of the lower spraying hole, water can be prevented from flowing out of the lower spraying hole after spraying is finished, water drainage is achieved in cooperation with the water drainage opening, and water dripping of the spraying arm is avoided; meanwhile, the drain opening is sealed during spraying, and water pressure loss can be reduced.

The invention provides a pyrite-coated WS2 heterogeneous Fenton composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of organic dye sewage treatment. The method comprises the following steps: carrying out mechanochemical ball milling on nano WS2 and pretreated pyrite to prepare pyrite coated WS2; wherein the mechanochemical ball milling technology can improve the industrial wastewater treatment efficiency and reduce secondary pollution. By controlling the contrast, pollutant concentration and pH value of the catalyst, the prepared composite catalyst shows excellent catalytic activity and stability. The invention provides an effective strategy for solving the self-repairing and recycling problems of the traditional Fenton catalyst in practical application, is expected to be widely applied to the field of industrial wastewater treatment, and promotes the development of an environment treatment technology.

The invention provides a sputum suction device for an ICU breathing machine, and particularly relates to the technical field of medical instruments.The sputum suction device comprises a cylinder, a timing controller is fixedly installed on one side of the cylinder, a screw cap is connected to the upper portion of the cylinder, a butt-joint pipe is fixedly connected to one side of the upper portion of the cylinder, one end of the butt-joint pipe extends into the cylinder, and the other end of the butt-joint pipe extends into the cylinder; the rotary ring and the first protrusion which can rotate are arranged on the portion of the sputum discharging end of the sputum discharging pipe, and vibration force can be continuously generated in cooperation with the fixed ring and the second protrusion, so that falling of sputum from the sputum discharging pipe is accelerated, and adhesion and residue of the sputum at the end, close to the collecting barrel, of the sputum discharging pipe are reduced; by means of the sealing cover which is automatically sealed above the collecting barrel, the collecting barrel with collected sputum is sealed in time, the situation that pathogens in the sputum are spread to the surrounding environment along with air in the process that the collecting barrel is taken to transfer and treat the sputum can be avoided, and therefore the risk that a patient and medical staff are infected is reduced.

The utility model belongs to the technical field of electric vehicle piston cleaning, and particularly relates to an electric vehicle piston cleaning device which comprises a cleaning box and a supporting table, a plurality of piston rods are arranged on one side of the top of a conveying belt, two brush rollers are rotatably connected to the middle of the cleaning box, liquid conveying pipes are fixedly connected to the inner walls of the two sides of the cleaning box, and the liquid conveying pipes are fixedly connected to the supporting table. And one side of each liquid conveying pipe is rotationally connected with a plurality of spray heads. After cleaning liquid is sprayed to a piston rod through a spray head, the surface of the piston rod is flushed, the piston rod 6 passing through the piston rod 6 can be physically cleaned through two brush rollers 7, the liquid is pumped through a water pumping pipe, impurities in the cleaning liquid are filtered through a filtering box, and recycling of the cleaning liquid is achieved. The cleaning efficiency is improved; and the consumption of cleaning liquid is reduced. And the sprayed cleaning liquid can be prevented from splashing, later cleaning is facilitated, and the practicability and the use efficiency of the equipment are improved.

The invention discloses a method for enhancing digestion sludge dewatering by recycling a flocculating agent, and relates to the technical field of municipal sludge treatment. The method comprises the following steps: identifying and utilizing a recyclable flocculant PAC in the residual sludge, adding CaO2 into the residual sludge containing PAC, uniformly mixing, and adjusting the pH value; feeding the treated residual sludge into an anaerobic digestion reactor, and monitoring the methane yield and the daily gas yield until the gas is exhausted, namely completing anaerobic digestion; and carrying out dehydration treatment on the digested sludge obtained after anaerobic digestion is completed so as to realize enhanced dehydration of the digested sludge. The water content of the digested sludge can be reduced, and the dehydration efficiency and the resource recycling rate of the digested sludge are effectively improved; and the polyaluminum chloride is used as a recycling flocculant to effectively crush the digested sludge particles, so that effective discharge of moisture among the digested sludge particles can be ensured, the flowability and compressibility of the digested sludge can be optimized, and subsequent transportation and treatment are facilitated.