49results about How to "Overcome secondary pollution" patented technology

The invention discloses a method for preparing an absorbent for a polyaromatic hydrocarbon pollutant. The method comprises the following step that: a biomass porous adsorption material and cationic surfactant are subjected to modification reaction, wherein a cationic surfactant comprises a quaternary ammonium cationic surfactant and a polymeric cationic surfactant, and is a cationic surfactant, of which the molecules carry C8-C24 alkyl, which can be dissolved in water, can generate ionization, and can remarkably affect wettability between solid and liquid. The invention also discloses the adsorbent for the polyaromatic hydrocarbon pollutant and application thereof. The adsorbent for the polyaromatic hydrocarbon pollutant can be used for polyaromatic hydrocarbon treatment of domestic sewage advanced treatment, and removal rate can be over 95 percent; and the preparation method has the advantages of wide raw material sources, low cost and simple process.

The invention relates to a rice fulvic acid polyelement composite liquid base fertilizer taking concentrated biogas slurry as a base solution, which is prepared from the following raw materials in portion by weight: 210 to 215 portions of ammonium polyphosphate, 55 to 60 portions of urea, 305 to 310 portions of potassium chloride, 30 to 32 portions of borax, 10 to 11 portions of zinc sulfate, 10 to 12 portions of suspending agent, 335 to 310 portions of the concentrated biogas slurry and 45 to 50 portions of fulvic acid. The fertilizer contains 357 to 374 g / L of macroelement, 51 to 54 g / L of the fulvic acid, and 12 to 23 g / L of water-insoluble matters; and the pH value of the fertilizer subjected to dilution by 250 times is 6.0 to 6.2. The production of the fertilizer comprises the following steps: comprehensive analysis of soil agricultural-chemistry characteristics, rice fertilization experiment, calculation of fertilizer proportion, selection of raw materials, material preparation, and mixing and preparation; and before the rice transplantation, the fertilizer is applied with a dosage of 132 kilogram / mu when irrigation and field harrowing are performed at the same time. The fertilizer uses biogas slurry, is free from generating secondary pollution, and has reasonable and even application; and the invention provides a base fertilizer containing the macroelement, microelement and fulvic acid active substances for rice to promote the growth and production increase of the rice.

The invention discloses a technology for removing heavy metals from sludge and a device thereof. The technology comprises the following steps: a sludge pump is used to send the sludge of a sludge adjusting pool to a biological leaching tank, an ultrasonic generator with the low-frequency of 10kHz-60kHz and the amplitude of 20% is used to perform low-frequency ultrasonic wave strengthening pretreatment to the sludge in the biological leaching tank for 1-15min; then biological leaching treatment is performed; a settling pond is used for separation, wherein a sewage pump is used to pump the supernate with heavy metals to an electroflocculation machine and perform electroflocculation treatment according to the existing electroflocculation technology, sludge is dewatered with a sludge dewatering device, alkali is added to neutralize the dewatered sludge and the neutralized sludge can be used as fertilizer; and the filtrate generated by the sludge dewatering device is returned to the electroflocculation device for treatment. The technology of the invention utilizes the ultrasonic wave strengthening pretreatment to accelerate the mass transfer speed of the sludge system and facilitate acidophilic thiobacillus to utilize the substrate; the digestion period of microbes is reduced, the efficiency is increased; the electroflocculation device is used to treat the wastewater with heavy metals; and the secondary pollution problem is overcome, thus solving the heavy metal problem of sludge and realizing harmless resource utilization.

The invention discloses a preparation method for Canna biological carbon capable of simultaneously adsorbing ammonia nitrogen and cadmium. The method comprises the following steps: step 1, preparation of raw materials: a step of removing impurities of harvested Canna and then carrying out air-drying, and successively carrying out crushing and drying; step 2, oxygen isolation carbonization: a step of placing the crushed and dried Canna in a carbonization furnace, then carrying out oxygen isolation carbonization reaction by heating the crushed and dried Canna to 480 to 520 DEG C with a heating rate of 4 to 6 DEG C / min, and carrying out heat-preserving reaction for 1.8 to 2.2 hours; and step 3, subjecting the carbonized Canna obtained in the step 2 to cooling to room temperature, and carrying out crushing and sieving so as to obtain the Canna biological carbon. The preparation method for the Canna biological carbon provided by the invention solves the problems of capability of only aiming at single pollutant, low adsorption efficiency, easiness to cause secondary pollution, high cost and the like in the prior art of adsorption; meanwhile, the wastes of waterbody remediation plants are reasonably utilized; secondary pollution is prevented; moreover, carbon in plants is stably sealed; carbon dioxide emission is reduced; and significant ecological benefits are obtained.

The invention relates to a polyvinyl acetate oxotitanium precursor sol spinning solution and a preparation method of a titanium oxide nano fiber photocatalyst. The preparation method comprises the following steps: preparing a polyvinyl acetate oxotitanium precursor sol spinning solution, electrostatically spinning, and thermally treating; to be specific, tetrabutyl titanate and glacial acetic acid are used as raw materials to prepare a polyvinyl acetate oxotitanium precursor, and then the precursor, aids and solvent are uniformly mixed according to a certain ratio to obtain a spinning solution; the spinning solution is prepared into polyvinyl acetate oxotitanium precursor fibers by virtue of an electrostatic spinning technology; and the precursor fibers are thermally treated in a muffle furnace to obtain solid titanium oxide nano fibers or mesoporous titanium oxide nano fibers. The method has the characteristics of simple process flow, excellent fiber quality, environmental friendliness and the like, the industrialized production is facilitated, and the obtained titanium oxide nano fibers have excellent catalytic performance and can be used as a photocatalytic material for degrading organic pollutants.

The invention discloses a processing method of purple sweet potato sauce. The processing method comprises the following steps: (A) preprocessing, namely washing selected fresh purple sweet potatoes to remove silt from skins of the purple sweet potatoes, peeling, crushing the peeled purple sweet potatoes into purple sweet potato slices; (B) pulping, namely, deactivating and steaming the purple sweet potato slices obtained in the step (A), adding 70-200% of water based on the weight of the purple sweet potatoes, rapidly heating the mixture to 80-95 DEG C, adding the mixture into a pulping machine, and pulping to obtain purple sweet potato pulp; (C) carrying out dosing and homogenizing, namely adding a mixture consisting of a seasoning agent, a stabilizing agent and an acidity regulator into the purple sweet potato pulp obtained in the step (B), carrying out vacuum stirring and blending, and carrying out homogenizing by virtue of a homogenizing machine; and (D) heating and sterilizing the homogenized materials obtained in the step (C), and cooling to obtain the purple sweet potato sauce. Compared with the prior art, the processing method has the advantages that by utilizing a closed processing manner, the mechanical degree is high, a fermentation step is omitted, the production cycle is short, the sauce is nutrient and healthy, and nutrition ingredients such as dietary fiber, pectin and protein in the purple sweet potato are preserved.

The invention relates to a method for preparing high molecular weight cationic polyacrylamide employing single-initiator. The technical scheme comprises the following steps: mixing 10-90 parts of acrylamide and 10-90 parts of cationic monomer, keeping the temperature of raw materials to 0-10 DEG C, adding all initiator sodium pyrosulfite to react while adopting adiabatic method to realize naturaltemperature rise, keeping the temperature after the reaction, reducing the temperature to discharge, pelleting, drying, grinding and screening to prepare the cationic polyacrylamide power product which is very soluble in water. The beneficial effect of the invention is that the method has the advantage of less type of the used initiator, low dosage of the initiator, simple process, high molecularweight of the product, good solubility and the like, the method is applicable to industrialized production; and the method can overcome the defect of the traditional method that additive is added toomuch so that the secondary pollution is easy to cause and the using effect is affected.

The invention provides a method for manufacturing organic fertilizer with orange peels and municipal sludge as main raw materials and organic fertilizer aiming at the problems that at present, the orange peels and the municipal sludge cause secondary pollution easily and the reclamation utilization rate is low. The organic fertilizer comprises, by weight, 30-35% of the orange peels, 30-35% of the municipal sludge, 15-20% of livestock manure, 16-23% of straw and 1-2% of biological strains. The organic fertilizer is obtained after ingredient preparing, initial fermenting, compost maturity, airing and insect killing are carried out. The organic fertilizer meets the organic fertilizer standard in our country. According to the method, the technology is simple, cost is low, hazard-free treatment and reclamation are effectively carried out on the orange peels and the municipal sludge, and the method has good environmental benefits and economic benefits.

The invention belongs to the technical field of water body heavy metal monitoring, and particularly relates to a BDD electrode and an application used for online monitoring of heavy metal ions in a water body. The BDD electrode takes a titanium plate as a working electrode base body material, B2O3 is selected as a boron source, CH4 is used as a nucleation carbon source, C2H5OH is used as a growthcarbon source, and H2 is used as an etching gas to be prepared through hot wire chemical vapor deposition technology. The BDD electrode can simultaneously detect the mixed solution of Cd2+ and Pb2+, and has excellent detection precision and accuracy, the low detection limit and the high reproducibility of the BDD electrode ensure the wide application range and the high accuracy, and green and simultaneous detection of the Cd2+ and THE Pb2+ can be ensured. The BDD electrode can meet the requirement for long-acting use of green and simultaneous detection of an on-line monitoring system on the electrode, effectively overcomes the defect that an existing common mercury membrane electrode has secondary pollution and performance attenuation, and has the application potential of on-line monitoring of the heavy metal ions in water, especially the Cd2+ and the Pb2+.

The invention relates to a nitrogen desorption device, comprising an adsorber, a condenser, a solvent drum, a buffer tube, a heating device, a desorption fan, a nitrogen heater and a nitrogen pipeline, wherein a nitrogen inlet is arranged on the buffer tube; the buffer tube is orderly connected with the desorption fan, the nitrogen heater, the nitrogen pipeline and the adsorber; the nitrogen heater is provided with a pipeline and connected to the heating device; conduction oil is filled inside the heating device; the adsorber is orderly connected with the condenser and the solvent drum. According to the nitrogen desorption device, traditional steam desorption and hot air discharge desorption of catalytic purification are changed into nitrogen desorption; the property of nonflammable gas of nitrogen is utilized to overcome the defects that secondary pollution of wastewater is generated in steam desorption and that a catalytic purification device easily ignites active carbon are overcome; the nitrogen is heated to 160-180 DEG C in the desorption process and conveyed to the active carbon adsorber to carry out desorption and regeneration on active carbon through the desorption fan, and the process is safe and reliable; a desorbed solvent is recycled through the condenser and the solvent drum. Thus, the nitrogen desorption device is environment-friendly.

Disclosed is a selective separation and recycling method for industrial solid waste slag. The selective separation and recycling method is suitable for recycling the solid waste slag generated in steel, metallurgy and chemical industries. The selective separation and recycling method is based on the systematic study of the microstructure of the industrial solid waste slag, high-selectivity chemical agents are adopted, through soaking, milling, magnetic separation, multistage sedimentation and other process steps, bonding materials between crystalline particles are dissolved or softened, and thus spatial dissociation of the crystalline particles with different components is achieved with a chemical method. Meanwhile, the surface characteristics of certain crystalline particles are changed selectively through the high-selectivity chemical agents, the differences of the sedimentation performance of different components are enhanced, separation of multistage sedimentation is completed conveniently, thus the separation efficiency is improved, energy consumption can be reduced by a large margin, and the treatment process is simplified. The selective separation and recycling method is suitable for recycling steel slag, stainless steel slag, metallurgy waste slag and the like and can also be used for recycling useful components or enrichment of certain trace elements from chemical solid waste slag.

The high-quality water supply system consists of tap water source tank, soft water producing system, pure drinking water equipment and special pipelines to households. The present invention makes it possible for urban residuents of use soft water and pure water in non-expensive cost.

The invention relates to an electrolytic etching agent for a chromium-zirconium-copper alloy and an electrolytic etching method. The electrolytic etching agent comprises, by weight, 18-38% of an electrolytic salt, 3-15% of a complexing agent, 1-5% of a regulator, 1-3 % of an activator, 0-1% of a surfactant and the balance water. The electrolytic etching agent for a chromium-zirconium-copper alloy realizes uniform electrolysis of a chromium-zirconium-copper alloy plate under energization so that the chromium-zirconium-copper alloy crystallizer surface with crystal lines and without an oxide film is obtained and thus a bonding capacity of the etched galvanoplastic nickel-cobalt coating and a chromium-zirconium-copper alloy matrix is better, the coating and the matrix are firmly bonded and a crystallizer service life is prolonged.

The invention discloses a method for degrading dyeing wastewater by using a metal-free catalytic system. According to the method, a metal-free catalyst activation oxidizer is utilized to generate reactive species (hydroxy free radicals -OH which have higher oxidation-reduction potential 1.8-2.7V) at normal temperature, thereby degrading dyeing wastewater efficiently. The method disclosed by the invention overcomes the defects of secondary pollution, low oxydol utilization ratio, narrow pH application range and the like in the traditional Fenton process, has the advantages of mild reaction conditions, obvious removal effect, no metal pollution, small environmental hazard, low catalyst consumption and low cost, and is simple to operate.

The invention specifically relates to a preparation method and application of a single-walled carbon nanotube flexible film capable of realizing high adsorption of organic dyes, belonging to the fieldof dye-adsorbing carbon nanotube flexible films. Single-walled carbon nanotubes prepared by using a floating catalyst chemical vapor deposition method are dispersed in an organic solvent, and then simple pumping filtration and drying are carried out so as to obtain the single-walled carbon nanotube film. The prepared single-walled carbon nanotube film has excellent flexibility and light weight, can efficiently adsorb organic dyes and is cyclically usable. The preparation method in the invention overcomes the problems that conventional carbon materials are low in organic dye adsorption quantity, usage of carbon material powder as an adsorbent easily leads to secondary pollution, etc. in the prior art; and the preparation method also overcomes limitations of conventional organic dye adsorption films in the aspects of weight, flexibility, cyclic usage, etc.

The invention provides a device for preventing liquid from splashing back. The device comprises a chuck for placing an object, a rotating shaft and a side wall, wherein the rotating shaft is fixedly connected with the chuck and is used for driving the chuck to rotate; the side wall is annularly arranged around the chuck; liquid on the object is spin-dried by rotation of the chuck; the side wall is used for preventing the liquid thrown away from the object against splashing out of the side wall; an organic film is arranged on the inner side of the side wall; and the anti-deformation ability of the liquid is increased by the organic film, so that the liquid from the object is prevented against splashing back to the object via the side wall, and secondary pollution to the object is avoided.

The invention discloses a sludge treatment device, and belongs to the technical field of sludge treatment. According to the technical scheme, the sludge treatment device comprises a machine base, a sludge treatment drum, a power driving mechanism, an output pipeline and a machine cover. The sludge treatment device is characterized in that the sludge treatment drum at least composed of three spiral barrels is included, the spiral barrels comprise the heavy metal treatment drum, the carbonization drum and the fixed carbon combustion drum which are coaxially installed into a whole in a sleeving mode from inside to outside, the spiral lines of the inner sides of barrel bodies are oppositely arranged, the barrel walls at the tail ends of the spiral lines are provided with discharge holes, and the two ends of the sludge treatment drum are each provided with a support device. Compared with the prior art, the sludge treatment device has the advantages of being novel, reliable in technical scheme, free of secondary pollution, high in investment efficiency and capable of rapidly achieving effects and has the outstanding substantive features and significant improvement.

The invention relates to the field of filtering materials, and discloses a filtering material capable of releasing ecological negative ions and a preparation method thereof. A main body of the filtering material is an air or water body filtering substrate which is loaded with nanometer negative ion powder and is made of a macromolecular material. The preparation method comprises the following steps of (1) mixing negative ion powder, an inorganic dispersant and deionized water, and grinding at high speed, so as to obtain stable dispersing liquid containing the nanometer negative ion powder; (2)adding the stable dispersing liquid into a water-based adhesive, stirring at high speed, and emulsifying, so as to obtain an opened-pore water-based adhesive emulsion containing the nanometer negative ion powder; (3) adopting a gap type spot-spray flow technology, and performing scattering type spot-spray flow operation on the filtering substrate multiple times, so as to obtain the filtering substrate loaded with the nanometer negative ion powder; (4) curing the filtering substrate, so as to obtain the filtering material. The filtering material has the advantages that the immobilizing property is efficient, the load is not liable to fall off, and the release amount of ecological negative oxygen ions can reach 25000 per square centimeter.

The invention aims to the problem of difficult treatment on orange peel residues and municipal sludge and low recycling utilization rate and discloses a method of producing biogas by recycling orange peel and dehydrated sludge through fermentation. In the method, the orange peel residue and the dehydrated sludge are employed as raw materials to perform anaerobic fermentation, wherein the fermentation pH is regulated through a quick lime supernatant. The method allows continuous fermentation and batch fermentation. In the method, the characters that the orange peel residue is high in organic substance content and the dehydrated sludge is high in nitrogen and phosphorus contents and is abundant in microorganism colonies are fully utilized, thereby not only effectively solves the problems of recycling the orange peel residue and the municipal sludge, but also increasing common fermentation efficiency of the orange peel residue and increasing the utilizability of biogas residue and biogas liquid as fertilizers after common fermentation of the orange peel residue. The method is excellent in economic and environmental benefit.

The invention relates to an application of a graphene covalently grafted aminobenzene terpyridyl-iron complex in degradation of organic pollutants in a Fenton system, and belongs to the technical field of advanced oxidation water treatment. An iron complex is used as a Fenton reagent, graphene is used as a carrier of the Fenton reagent, and the graphene is connected with the iron complex through amido bonds, so that iron ions can be firmly immobilized on the surface of the graphene, and the problems of iron ion loss and secondary pollution are effectively solved. Meanwhile, the high electron transfer efficiency and the large specific surface area of the graphene can cooperate with the Fenton reagent to play a higher role in degrading organic pollutants. When the graphene covalently graftedaminobenzene terpyridyl-iron complex disclosed by the invention is used for degrading rhodamine B in the Fenton system; under the condition that the pH value is 4, the degradation rate of 100 mg / L rhodamine B is close to 100% within 60 min, the degradation rate is not decreased after five times of circulation, high degradation efficiency and good stability are shown, and good application prospects are achieved.

The invention provides a solid-supported ionic liquid and a preparation method thereof. The cations of the solid-supported ionic liquid are trialkyl benzyl ammonium cations as shown by a formula (I), and the anions of the solid-supported ionic liquid are deprotonated dialkyl diglycol amic acid as shown by a formula (II); in the formula (I), R1 and R2 are methyl, and R3 is methyl or ethoxyl; in the formula (II), R4 and R5 are respectively and independently alkyl, and at least one of the R4 and R5 is an alkyl group with at least 6 carbon atoms. According to the solid-supported ionic liquid and the preparation method thereof which are provided by the invention, the rare earth ions are extracted firstly, the impurity removal efficiency of iron and aluminum foreign ions is high, so that the recovery rate of low-concentration rare earth is high, and the utilization rate of rare earth resource is improved.

The invention discloses a preparation method of a sewage treatment membrane material, which is characterized by comprising the following steps: S1, preparing a polymerizable sulfuryl diimidazolium salt monomer, S2, preparing ethoxysilane modified 2, 4, 6-tri [(p-carboxyphenyl) amino]-1, 3, 5-triazine, and S3, preparing a membrane material. The invention also discloses the sewage treatment membranematerial prepared according to the preparation method of the sewage treatment membrane material and application of the sewage treatment membrane material in sewage treatment. The sewage treatment membrane material disclosed by the invention is excellent in comprehensive performance, good in performance stability, remarkable in sewage treatment effect, capable of effectively catalyzing organic matters in sewage to be decomposed and adsorbing and separating heavy metal ions in the sewage, and long in service life.

The invention discloses a biomass material for solidifying quaternary ammonium salt as well as a preparation method and application thereof. A quaternary ammonium group is solidified on the surface ofthe biomass material; the chemical formula of the quaternary ammonium group is -N<+>R(CH3)2, wherein R is -C8H17, -C10H21, -C12H25, -C14H29 or -C16H33; the content of the quaternary ammonium group is0.1 to 1.4 mmol / g. The biomass material prepared according to the method is expected to realize deep purification of bacteria and pathogenic bacteria in water simply and efficiency, provides new thought for deep treatment of biochemical tail water and treatment of water of polluted water source, and has high innovativeness.

The invention discloses a ceramic electric kettle, and relates to the technical field of ceramic processing. The ceramic electric kettle comprises a ceramic kettle body, a heating tube and a heat insulation bottom cover. The heating tube is approximately spiral, the heating tube is fixedly arranged on the heat insulation bottom cover and is electrically connected with a plug on the heat insulationbottom cover, and the heat insulation bottom cover is fixedly arranged on the bottom surface of the ceramic kettle body; the bottom surface of the ceramic kettle body is provided with a mounting groove which is approximately spiral and is used for embedding the heating tube; the cross section profile of the mounting groove is semicircular; and the surface of the mounting groove is coated with a layer of heat-conducting silica gel film which is tightly attached to the heating tube. After the ceramic kettle body is formed, the bottom surface is independently polished, and the spiral mounting groove is formed in the bottom, so that the bottom surface can be thinned, the heat conduction effect can be ensured, and the strength of the bottom surface can be well ensured; and the full-ceramic inner container is realized, so that the problem of secondary pollution of drinking water due to the fact that a stainless steel inner container is easy to form incrustation and even rust is solved.

The invention relates to the technical field of sewage treatment, and discloses a carbon-neutralized sewage treatment solar heat gathering reactor which comprises a reactor body; the reactor body is divided into a first reaction layer and a second reaction layer which are arranged up and down by arranging a biological filler grating plate, the first reaction layer is arranged above the second reaction layer, and the first reaction layer is filled with a first biological filler to form a microalgae community, and the second reaction layer is filled with a second biological filler to form an efficient flora. The method has the characteristics of economy, high efficiency, simplicity, feasibility and carbon emission reduction.

The invention relates to a flocculation-sterilization double-effect macromolecule and a preparation method thereof. Diallyl amine and hydrochloric acid are adopted as raw materials to firstly synthesize diallyl amine hydrochloride, the diallyl amine hydrochloride is polymerized to poly-diallyl amine hydrochloride under the effect of a free radical initiator, and the poly-diallyl amine hydrochloride is reacted with epoxy long chain alkyl dimethyl ammonium halides which is obtained by Long-chain alkyl dimethyl amine and epoxy propane halogen in absolute ethyl alcohol in a water-alcohol mixed solvent to prepare the flocculation-sterilization double-effect macromolecule. The flocculation-sterilization double-effect macromolecule overcomes the weaknesses that the conventional flocculant does not have the sterilization function, the bactericide is lack of flocculation capacity, the flocculation and the sterilization are always separated in the application, the residual flocculant is reactedwith the oxidization bactericide in the sterilization procedure to a harmful substance, and the bacteria dirty after the sterilization cannot be eliminated through the flocculation. The product of the invention can realize the flocculation and the sterilization functions at the flocculation procedure, so the traditional water treatment process can be simplified, and the cost can be reduced. The flocculation-sterilization double-effect macromolecule is suitable for being used as a processing agent for original water, waste water and drinking water.

The high-quality water supply system consists of tap water source tank, soft water producing system, pure drinking water equipment and special pipelines to households. The present invention makes it possible for urban residuents of use soft water and pure water in non-expensive cost.

The invention discloses an oil-containing high-concentration phenol-ammonia wastewater treatment device and process. The oil-containing high-concentration phenol-ammonia wastewater treatment device comprises an oil removal reaction tank, an oil removal separation tank, an extraction sieve-plate tower, a deacidification tower, a deamination tower and the like. Oil substances in wastewater are removed and recovered by adopting demulsification, gravity settling and pre-extraction methods, and various phenols and ammonia substances in water are effectively treated by combining a complexing extraction method and a stripping method, so that efficient removal and recovery of phenols and ammonia are realized, and cyclic utilization of an extraction agent is ensured. According to the process technology, the removal rate of petroleum substances in the wastewater is larger than 90%, the removal rate of total phenols is larger than 85%, the removal rate of NH4-N is larger than 95%, oil, phenol ammonia and acidic substances can be efficiently and economically removed and recycled through quality-divided advanced treatment of the wastewater, and the process technology is high in reliability and high in adaptability to sewage and has good economic benefits and social benefits.

The invention relates to the technical field of agricultural production, and discloses a soil disinfecting and repairing device which comprises an induced draft fan, a multi-curved-surface solar condenser, a disinfecting mechanism and a motor. A dual-layer glass vacuum pipe is arranged in the multi-curved-surface solar condenser. A heat absorption body is arranged in the dual-layer glass vacuum pipe. The two ends of the dual-layer glass vacuum pipe are connected with the induced draft fan and the disinfecting mechanism through a first air outlet duct and a second air outlet duct. A ventilatingmechanism is arranged in the disinfecting mechanism. A plurality of clamping grooves are evenly formed in the side face of the ventilating mechanism. Column plugs corresponding to the clamping grooves are arranged in the ventilating mechanism. A T-shaped cavity runs through each column plug. The column plugs are connected to the inner wall of the ventilating mechanism through tension springs. A cam is arranged in the ventilating mechanism. The bottoms of the column plugs make contact with the side faces of the cams under the tensile force of the tension springs. Soil is heated by high-temperature air, and the disinfecting and killing of injurious insects and pathogenic bacteria in the soil are effectively realized.

The invention relates to a method for preparing polytitanium acetate precursor sol spinning solution and titanium oxide nanofiber photocatalyst. Including the preparation of polytitanium acetate precursor sol spinning liquid, electrostatic spinning, and heat treatment; first preparing the polytitanium acetate precursor using tetrabutyl titanate and glacial acetic acid as raw materials, and mixing the precursor and additives in a certain proportion , solvents are mixed evenly to obtain a spinning solution; the spinning solution is used to obtain polytitanium acetate precursor fibers through electrospinning technology; the precursor fibers are heat-treated in a muffle furnace to obtain solid titanium oxide nanofibers or mesoporous oxidation Titanium nanofibers. This method has the characteristics of simple process flow, optimized fiber quality and green environmental protection, which is conducive to industrial production. The titanium oxide nanofibers obtained have excellent catalytic properties and can be used as photocatalytic materials for the degradation of organic pollutants.