598 results about "Catalytic ozonation" patented technology

The invention relates to a method for preparing a double-component metallic oxide catalytic ozonation catalyst. The method is characterized in that, after being activated, gamma-Al2O3 microballoon is soaked in mixed liquor of manganous nitrate and cerous nitrate, and then after drying and roasting, the loading type manganese and cerium double-component composite catalyst is prepared. The catalyst has high catalytic activity, is applied in organic pollutant degradation through catalytic ozonation, remarkably fastened in degradation rate compared with degradation using ozone singly or using unloaded gamma-Al2O3 microballoon, greatly improved compared with loading catalyst using single component of manganese or cerium and capable of reducing input amount of ozone, and according saves operation cost. Simultaneously, the catalyst has the advantages of being simple in preparing method, low in cost, stable in catalytic performance, capable of being repeatedly used and the like and is favorable for popularization and application of the catalytic ozonation technology.

The invention relates to the field of industrial wastewater treatment processes and provides a method for deeply treating, desalting and recycling industrial wastewater with high salt content. The method comprises the following steps: 1) carrying out efficient coagulation treatment on the industrial wastewater with high salt content to obtain supernatant; 2) carrying out chemical precipitation on the supernatant obtained in the step 1) to remove high valence ions with valence higher than bivalence in the wastewater; 3) carrying out catalytic ozonation treatment on the supernatant subjected to chemical precipitation in the step 2); 4) carrying out multi-media filtration, precise filtration and membrane filtration treatment on the wastewater subjected to catalytic ozonation in the step 3) in sequence; and 5) carrying out electrodialysis reversal treatment on the effluent obtained after membrane filtration in the step 4). By adopting the method, organic matters, bacteria, colloids, suspended particles, Ca<2+>, Mg<2+> and high valence ions, other soluble inorganic salts and the like in the industrial wastewater with high salt content are removed by utilizing the coupling and synergistic effects of different unit technologies, thus achieving deep treatment, desalting and recycling of the industrial wastewater with high salt content.

The invention relates to an integral treatment process of the oily sewage of an oil field. The process flow in the invention is as follows: settling sand, removing oil, breaking emulsion through air flotation, treating with a microwave-enhanced Fenton system, performing flocculation and air flotation, performing precision filtering, performing catalytic ozonation with an activated carbon fiber felt, and performing ultrafiltration to obtain clean water. By adopting the integral treatment process, the operations of oil removal, emulsion breaking, advanced oxidation, flocculation, catalytic ozonation and membrane separation can be continuously realized. The floor space of equipment in the invention is small; the treatment process is suitable for various oily sewage and has obvious treatment effect; the removal rate of the chemical oxygen demand (COD) of raw water is more than 96%, and the oil content and the removal rate of suspended matters are 100%; and the turbidity of the obtained water is 4-6 NTU. The main indexes of the process provided by the invention such as the COD, oil content, suspended matters, turbidity and the like are better than those of the current oily sewage treatment process in oily sewage treatment; and the quality of the treated water can meet the related rules of the Integrated Wastewater Discharge Standard (GB8978-1996) and the Environmental Quality Standards for Surface Water (GB3838-2002).

The invention discloses a preparation method of haydite catalyst for catalytic ozonation. The method comprises the preparation of the haydite raw material nuclear, and the coating and the sintering process of the catalyst on the haydite raw material nuclear. The coating of the catalyst on the haydite raw material is used for crushing one or a plurality of the composite catalyst activity component(s) of MnO, MnO2, TiO2, CoO, Co3O4, Fe2O3, Fe4O3, and FeO into particles with the diameter of 0.1-1mm and being mixed with the raw materials produced by the haydites to produce 3-4mm haydites for coating catalyst. The haydite catalyst for catalytic ozonation is made. After mixture, the catalyst and the haydite raw material are loaded on the original haydite raw material nuclear with high adhesion strength, and meanwhile the once sintering molding guarantees the high utilization ratio of the catalyst, and the prepared haydite catalyst can be used repeatedly, thus reducing secondary pollution and operation cost of ozonation.

The invention relates to a catalytic ozonation method for removing the organic pollutant, which solves the problems that in the prior art both the residual hydrogen peroxide from the homogeneous catalysis ozonation using hydrogen peroxide as catalyst and the byproduct bromate produced by the heterocatalysis ozonation using metal oxide as catalyst play a bad impact on human health and cause secondary pollution of water. The method of the invention comprises the following steps: a. laying the catalyst in a reactor; b. adding ozone and hydrogen peroxide; c. controlling the contacting time of the ozone and the hydrogen peroxide, that is, finishing the removal of the organic pollutant in water. The method of the invention dissolves the problem of residual hydrogen peroxide, reduces the formation of the bromate without causing the secondary pollution of water and affecting human health, which is suitable to apply in the real water treatment process as a drinking water advanced treatment technology.

The invention discloses a wastewater advanced treatment method of pulping and paper making from waste paper and a treatment system thereof. The system is a wastewater advanced treatment system formed in a way that a pre-coagulation tank, a coagulation reaction tank, a coagulation sedimentation tank, an advanced oxidation treatment device, a catalytic ozonation device and a biomembrane contact oxygenation device are connected in sequence. The system can realize the organic combination of the coagulation sedimentation treatment, the advanced oxidation treatment, catalytic ozonation treatment and biomembrane contact oxygenation treatment. The wastewater treatment of pulping and paper making from waste paper is carried out by the combination of physical, chemical and biological treatments, and can achieve better treatment result on the premise that low operation cost is guaranteed. After treatment, the effluent can not only meet the first class discharge standard, but also meet the requirements of industrial reused water.

The invention provides a preparation method and application of a supported metal oxide catalyst for removing ammonia nitrogen in water through catalytic ozonation. The preparation method comprises the steps of impregnating a catalyst carrier subjected to activating treatment in an impregnating solution formed through mixing any two metal salts of cobalt, manganese, cerium, iron, nickel, magnesium and copper for a certain time, then drying, and roasting to obtain the supported metal oxide catalyst. The preparation method is green and environmental-friendly, simple to operate, and easy for industrialization. By applying the supported metal oxide catalyst prepared by the invention, ammonia nitrogen can be converted into nitrogen at the normal temperature and the normal pressure so as to be effectively removed. Co3O4-Al2O3 is adopted as a catalyst for reacting for 6h, and the removal rate of the ammonia nitrogen of 200mg / L of ammonium chloride stimulated wastewater approximates to 100 percent, so that the supported metal oxide catalyst has a better effect on removing the ammonia nitrogen through catalytic ozonation.

The invention relates to the field of industrial wastewater treatment processes and provides a multi-stage countercurrent electrodialyzer reversal-based method for treating saline wastewater in the coal chemical industry. The method comprises the following steps: 1) carrying out catalytic ozonation treatment on the saline wastewater in the coal chemical industry; 2) carrying out multi-media filtration and membrane filtration treatment on the wastewater subjected to catalytic ozonation in the step 1) in sequence; and 3) treating the effluent obtained after membrane filtration in the step 2) with a multi-stage countercurrent electrodialyzer reversal, thus achieving deep treatment, desalting and recycling of the saline wastewater in the coal chemical industry, wherein the multi-stage countercurrent electrodialyzer reversal comprises an electrodialysis membrane stack unit, a frequency reversal control unit and an online monitoring and process control unit. The method has the advantages of high fresh water recovery rate, low concentrated water discharge, low operating cost, stability in system operation and the like and can avoid the problems of low fresh water recovery rate, low concentration multiple, high treatment cost, serious membrane pollution, instability in system operation and the like in the routine techniques.

The invention discloses a catalytical ozonization catalyst prepared by utilizing multi-source sludge and an application thereof, and establishes a method for preparing a sludge group active carbon catalyst for catalytical ozone oxidation organic industrial waste water. The method comprises the following steps of: utilizing multi-source sludge such as surplus sludge generated by urban sewage factory biochemical treatment and a metal sludge generated by a Fenton oxidation method, preparing a skeleton which is a sludge group active carbon through steps such as organic substance adding, actification, dehydration, drying, mixing, roasting and screening, wherein a surface layer contains a solid catalyst of metallic oxide, and the ratio of the sludge group active carbon and the metallic oxide in parts by weight is 1:(0.3-0.5). The catalyst is used for catalyzing ozone oxidation treatment organic industrial waste water and has higher catalytic activity and stability, the processing range is wide, the realization and popularization and application are easy, and the economic benefits are improved in an organic industrial waste water processing procedure.

The invention discloses a physical method for treating vitamin C production wastewater by strengthening and catalyzing ozonization. Ultrasonic radiation, ultraviolet irradiation and hydrodynamic cavitation methods are adopted to be combined with a chemical method for heterogeneously catalyzing the oxidation of ozone respectively to ensure that organic matters in vitamin C wastewater are oxidized and degraded into CO2, and the generated CO2 makes Ca ions in the wastewater precipitated. Compared with single heterogeneous catalysis to the oxidation of the ozone, the utilization rate of the ozone of the method is improved by 1.3 to 4 times, and oxygen consumption and operating cost are remarkably reduced; the COD value of output water can be less than 80mg / L, the decolorization ratio reaches 100 percent, the output water has no peculiar smell, the total hardness removal rate is more than 90 percent, and the removal rate of the organic matters is more than 95 percent; and the method has no secondary pollution, and the treated VC wastewater can reach the national grade one discharge standard or is used as process water for recycling.

The invention discloses a method for preparing an activated carbon supported iron oxide catalyst, as well as a wastewater treatment system thereof, which relates to a wastewater treatment technique, in particular to a method for treating refractory toxic organic pollutants in wastewater. The activated carbon supported iron oxide catalyst is a catalyst which is low in price and can be reclaimed. The catalyst can be combined with other techniques so as to be applied to wastewater treatment under mild conditions, wherein the catalyst is combined with ozone so as to form a catalytic ozonation technique and is combined with hydrogen peroxide so as to form a heterogeneous phase Fenton technique; the heterogeneous phase Fenton technique is combined with ultrasound so as to form an ultrasonic synergistic heterogeneous phase Fenton technique; the techniques have good effect of removing refractory wastewater; and a solid phase catalyst is easy to separate, can not introduce new impurities, and allow effluent to be easy to reach the standard. The method has the advantages of simple technological process, low cost and good prospects in actual application.

The invention belongs to the field of catalysts and discloses a loaded binary composite metal oxide catalytic ozonation catalyst with gamma-Al2O3 microspheres as carriers and manganese oxide and ferric oxide as active components and a preparation method thereof. The preparation method of the loaded binary composite metal oxide catalytic ozonation catalyst comprises dipping gamma-Al2O3 microspheres in a mixed solution containing water-soluble manganese salt and water-soluble ferric salt, taking out the gamma-Al2O3 microspheres, carrying out drying and carrying out high temperature roasting to obtain the loaded binary composite metal oxide catalytic ozonation catalyst. The loaded binary composite metal oxide catalytic ozonation catalyst has significantly improved particle uniformity, good stability, good reusability and excellent catalytic activity. Compared with gamma-Al2O3 microsphere or manganese and iron single component-loaded catalysts, the loaded binary composite metal oxide catalytic ozonation catalyst significantly improves an organic removal rate by at most 38%, greatly reduces paper-making wastewater organic pollutant types and content and fully degrades difficultly biodegraded organics.

The invention provides a high-efficiency catalytic ozonation process which is particularly applicable to purification and treatment of water bodies with organic pollutants. Pretreated organic wastewater is mixed with ozone prior to entering a catalytic oxidation tower through a micronano bubble generation device, and the catalytic oxidation tower is filled with catalytic filler materials for catalyzed oxidative degradation of organics in wastewater. The catalytic filler materials in the catalytic oxidation tower are large in specific surface, ozone catalyzing capability can be enhanced by composite metals on the catalytic filler materials, and effective utilization rate of hydroxyl free radicals can be increased. Compared with traditional catalytic treatment processes and catalytic filler materials, the high-efficiency catalytic ozonation process has the advantage of high efficiency in elimination of toxic and harmful organics in the water bodies.

The invention discloses an advanced treatment system of coking wastewater. The system mainly comprises an ozone generator, a catalytic ozonation reactor, a gas-liquid separation device, a bumper post, a biological activated carbon reactor and a tail gas absorption device, wherein the catalytic ozonation reactor has a three-section repeating structure; and each repeating structure section is divided to three subsections from bottom to top, namely an ozone absorption section, a catalyst bed layer and a catalytic reaction section. The three-section superimposing mode is utilized to intensify themass transfer function of ozone in the solution and increase the utilization rate of ozone; and the catalytic ozonation technology is adopted to increase the biochemical quality of coking wastewater,increase the treatment efficiency of the subsequent biological activated carbon technology and realize the aim of the high-efficiency advanced treatment of coking wastewater.

The invention relates to a preparation method of a catalyst, in particular to a preparation method of a load-type metallic oxide ozone catalytic oxidation catalyst, which is characterized by comprising the following steps of (1) selecting ceramic filter bulbs to serve as a carrier, washing through deionized water, soaking for 24h by using diluted hydrochloric acid, and washing through the deionized water to effluent neuter for stoving; (2) dipping for 24h in nickel nitrate solution with the concentration of 0.1-1.0mol / L and drying; (3) roasting for 5h in a muffle furnace at 500 DEG C to obtain roasting objects; and (4) washing through the deionized water and stoving to obtain the load-type metallic oxide ozone catalytic oxidation catalyst. The preparation method is simple, low in cost, capable of greatly improving oxidation rate and efficiency of ozone on organic pollutant, good in product stability and capable of repeatedly using, and having important significant on application and dissemination of catalytic ozonation techniques.

The invention belongs to the technical field of water treatment, and in particular relates to a catalytic ozonation catalyst for the wastewater treatment and a preparation method thereof. The catalyst is prepared from an active component, an auxiliary and a carrier, wherein the active component is a transition metal oxide, the auxiliary is an alkali metal oxide, an alkaline earth metal oxide or a lanthanide metal oxide, and the carrier is an aluminum oxide, active carbon or ceramsite. The invention further provides a preparation method of the catalyst. The preparation method comprises the steps: loading the active component, the auxiliary and a dispersing agent on the carrier by utilizing an impregnation method or a dry mixing method, curing, drying and roasting, thereby obtaining the catalyst. According to the catalytic ozonation catalyst for the wastewater treatment and the preparation method thereof, the COD removal rate is higher, and the service life is longer; the preparation process is simple, the costs are low, no secondary pollution exists, and the catalytic ozonation catalyst for the wastewater treatment and the preparation method thereof are very suitable for industrial production.

The invention relates to water deep treatment technology of heterogeneous catalytic ozonation depollution. With the combination of catalytic ozonation depollution technology with membrane filtration technology, a novel, high-efficient, and economical catalytic ozonation water deep treatment technology is provided, which combines the advantages of the two technologies, overcomes their disadvantages, effectively improves the ozone utilization rate and the ozone oxidation capability, reduces some toxic and harmful substances generated due to incomplete oxidation, alleviates the problem of ceramic membrane contamination, and prolongs the system operation period. An experiment device mainly comprises three parts: an ozone generation device, a ceramic membrane device, and a computer data acquisition and analysis system; an ozone outlet of the ozone generation device is connected with a water inlet valve of the ceramic membrane assembly through a silicone flexible pipe to realize the coupling of the two system. The method of the invention can improve the purifying effect of routine water treatment technology, and provides novel, high-efficient and cheap water deep treatment technology for enhanced removal of low-concentration high-toxicity refractory organic pollutants in water.

The invention discloses an activated carbon catalytic ozonation device and a sewage treatment process thereof. The device comprises a reaction tank, wherein the reaction tank is partitioned into a rising reaction zone, a falling reaction zone and a separation zone from inside to outside in sequence by virtue of guide cylinders; the bottoms of the three zones are communicated and are used as an activated carbon storage zone; the rising reaction zone is internally provided with an ozone and water input device; the tops of the rising reaction zone and the falling reaction zone are communicated; an annular flow director is arranged at the communicating part of the bottoms of the falling reaction zone and the separation zone; at least a part of the bottom of the flow director stretches into the activated carbon storage zone; an inclined guide surface is arranged at the part below the separation zone, of the top of the flow director. By adopting the activated carbon catalytic ozonation device, the activated carbon can be in a circulation fluidized state, the porosity of an activated carbon bed is improved, the effect of catalysis reaction of ozone molecules and organic pollutants on the surface of activated carbon is improved, the capability of activated carbon catalytic ozonation is improved, the utilization rate of ozone is increased, and the antifouling effect is improved.

The invention discloses a wastewater treatment catalytic ozonation reactor for a fluidized bed. The wastewater treatment catalytic ozonation reactor for the fluidized bed comprises a reactor housing, wherein an external cylinder is arranged in the housing, an internal cylinder is arranged in the external cylinder, the top part of the internal cylinder is lower than that of the external cylinder, the bottom of the internal cylinder is lower than that of the external cylinder; a baffling channel is formed between the bottom of the external cylinder and the inner wall of the housing, a refluxing channel is formed between the bottom of the internal cylinder and the inner wall of the external cylinder. According to the wastewater treatment catalytic ozonation reactor for the fluidized bed disclosed by the invention, a catalytic reaction region, a diversion region and a precipitation region can be arranged in the same reactor so as to realize integration without needing additional catalyst separation and back conveying equipment. The invention also discloses a wastewater treatment method with application of the wastewater treatment catalytic ozonation reactor. According to the wastewater treatment method disclosed by the invention, by virtue of wastewater refluxing, residual soluble ozone in wastewater is fully utilized, and the ozone utilization ratio and the wastewater treatment depth are greatly increased.

A process for preparing the nano-TiO2 catalyst includes slowly dissolving tetrabutyl titanate in absolute alcohol, immersing the granular activated carbon or active Al2O3 or white silica gel or molecular sieve or zeolite in it, oscillating for 5-48 hrs, filtering, and drying or ageing. It can be used to treat water by making it, ozone and water to be treated in contact for 1-50 min.

The invention provides a method and a device for pretreating thickened oil refining sewage. The method comprises the steps of homogeneous sedimentation, emulsion breaking oil removal and sulphur removal, coagulating sedimentation sulphur removal, primary ozonation and secondary catalytic ozonation, for pretreating high-oil-content and severely-polluted sewage generated in a thickened oil refining process. In the steps of the homogeneous sedimentation, the emulsion breaking oil removal and sulphur removal, and the coagulating sedimentation sulphur removal, a thickened oil resource is recovered to the greatest extent mainly by physical and chemical means, and pollutants such as mud residues and SS (suspended solids) in non-dissolved states are removed; then a water sample is further subjected to the primary ozonation and the secondary catalytic ozonation; the acute catalytic ozonation of water is reduced; and the biodegradability is improved. The pretreated sewage meets a water inlet requirement of a biochemical treatment technology in a general oil refining sewage plant; and multiple functions such as recovering the oil resource, and eliminating foul gas pollution can be achieved in the process of pretreating the thickened oil refining sewage.

The invention discloses a two-stage micro / nano aeration and catalytic ozonation wastewater treatment system which comprises a raw water lift pump, a two-stage ozone generator, a two-stage catalytic ozonation reactor, a titanium microporous aeration device, a micro / nano bubble generation pump, a gas-liquid mixing stable tank and a tail gas absorption tank, wherein a first-stage catalytic reactor is used for aeration in the presence of a binary iron-manganese base catalyst by virtue of a titanium alloy micron aerator and the size of bubbles is 5-10microns; a water inlet is located at the upper part of the first-stage reactor in a cross-flow manner; the two-stage reactor is used for aeration in the presence of a ternary load type catalyst through the micro / nano bubble generation pump and the size of the bubbles is 100-400nm; a gas flow and a liquid flow are mixed and then are treated from bottom of the two-sage reactor from to top; and a water producing opening of the system is formed at the upper part of the two-stage reactor. According to the two-stage micro / nano aeration and catalytic ozonation wastewater treatment system, the two-stage reactor is respectively aerated through micron bubbles and nano bubbles, so that the OH generation quantity and catalysis efficiency are improved; and the cost of the system is greatly reduced.

The invention discloses a microporous overcurrent ozone catalytic ceramic membrane for waste water deep treatment as well as a preparation method and an application method thereof and belongs to the technical field of catalysts for waste water deep treatment. The catalytic ceramic membrane disclosed by the invention is prepared by the following steps: mixing pre-roasted and ground 400-600-mesh Al2O3 power with a catalytic component solution of dysprosium nitrate, molybdenum nitrate and manganous nitrate; and by taking hydroxypropyl methyl cellulose, polyethylene glycol and an aqueous solution of dysprosium nitrate, molybdenum nitrate and manganous nitrate as a forming assistant, pasting, mixing, extruding and forming, drying and vacuum-sintering the mixture to obtain the microporous overcurrent ozone catalytic ceramic membrane. The microporous overcurrent ozone catalytic ceramic membrane prepared by the invention creatively couples a microporous overcurrent with a catalytic ozonation technology, so that waste water passes through micron order ducts of the ceramic membrane at a relatively high flow rate by means of an external pressure different action, and therefore, the mass transfer efficiency of ozone and organic matter pollutants and the surface of the catalyst is effectively accelerated and meanwhile, the micron order ducts developing in the catalyst hugely increase the effective catalytic area of a catalytic module in a unit volume.

The invention relates to a catalytic ozonation catalyst and its preparation method. The catalyst is mainly composed of a carrier NaY molecular sieve, active metal oxides manganese oxide and titanium dioxide, and catalyst molding auxiliary agents. The carrier NaY molecular sieve supported with manganese oxide is a main catalyst agent. The content of manganese oxide in the main agent is 10.5wt%-11.5wt%. The catalyst molding auxiliary agents contain kaolin, a binder, a lubricant and a pore forming agent, wherein the weight ratio of the main agent to kaolin is 1:0.3-0.6; the weight ratio of the main agent to the binder is 1:0.5-0.9; the weight ratio of the main agent to the lubricant is 1:0.5-0.85; the weight ratio of the main agent to the pore forming agent is 1:0.02-0.04; and the content of titanium dioxide in the catalyst is 1.5wt%-3.0wt%. By using the NaY molecular sieve as the carrier, by the adoption of ion exchange and dipping methods and with the combination of supporting heterogeneous metal, the comprehensive catalytic ozonation catalyst is prepared. The catalytic ozonation catalyst can be used to process organic wastewater and has advantages of high utilization rate, high dispersiveness, obvious processing effect and long service cycle.

The invention discloses a method for treating waste water in a heterogeneous catalysis and oxidation mode through hydrogen peroxide cooperated with ozone. The method comprises the following steps: a, adding the waste water into a reactor, adding a load type ozone catalytic ozonation heterogeneous catalyst, then adding hydrogen peroxide solution and mixing; b, evenly introducing ozone into the reactor through a micropore titanium plate at the bottom of the reactor in a microbubble mode, and performing waste water treatment reaction. According to the method for treating the waste water in the heterogeneous catalysis and oxidation mode through the hydrogen peroxide cooperated with ozone, disclosed by the invention, more hydroxyl radicals are generated to perform strong catalytic oxidation treatment on the waste water, and a good effect of removing high-stability organic matter difficult to degrade in the waste water is achieved.

The invention discloses a catalytic ozonation catalyst for volatile organic waste gas treatment as well as a preparation method and application of the catalytic ozonation catalyst. The catalytic ozonation catalyst comprises a carrier and an active component, wherein the carrier is aluminium oxide, silicon oxide, zeolite or a ceramic ball; the active component comprises manganese oxide and an assistant; and the assistant is an oxide of at least one element of iron, nickel, cobalt, chrome and vanadium. By means of the catalyst disclosed by the invention, the problems that the pollutant removing efficiency is low, the investment cost and the operating cost are high, the reaction condition is strict and the like in existing techniques for treating volatile organic waste gases are solved.

The invention discloses a process method for performing advanced treatment on petrochemical wastewater through catalytic ozonation. The method is characterized by comprising the following steps of: allowing petrochemical wastewater to sequentially flow through a pre-oxidation tower, a catalytic oxidation tower I and a catalytic oxidation tower II, and respectively filling high-porosity inert filler, activated aluminum oxide-based catalyst and granular active carbon in three towers, wherein the pre-oxidation tower operates under pressure. The ozone is prepared by an oxygen-enriched source or oxygen source ozone generator, and tail gas in the tower is collected and treated in a unified mode.

The invention provides a preparation method for a load transition metal catalyst for ozone oxidation. The preparation method comprises the following steps: placing a catalyst carrier raw material in a NaOH aqueous solution, soaking, drying, preparing activated aluminum oxide sol, soaking catalyst particles in the activated aluminum oxide sol, drying and roasting, so as to obtain a coating, repeating the steps until a catalyst carrier coated for multiple times is obtained, enabling the content of the activated aluminum oxide coating to be 5-15% of the catalyst carrier in weight, soaking the catalyst carrier in an aqueous solution containing active constituents of transition metal, dying and roasting, so as to obtain the load transition metal catalyst. The load transition metal catalyst is high in ozone catalytic activity, the COD concentration of organic wastewater can be reduced to 50 mg / L below from 100 mg / L by the load transition metal catalyst, the load transition metal catalyst has a stable catalytic effect during the process of treating organic wastewater through catalytic ozonation, and the catalytic activity is not changed basically after the load transition metal catalyst continuously runs for multiple days in a fixed bed reactor.

The invention discloses a method for preparing mineral organic fertilizer by using surplus sludge in municipal sewage plants. The method mainly comprises the following three steps: firstly reducing sludge in a sludge thickening tank, dehydrating the reduced sludge by adopting a catalytic ozonation method, carrying out subcritical water reaction on the dehydrated sludge, and discharging solids subjected to harmless treatment; finally mixing modified attapulgite clay with the sludge subjected to harmless treatment, chicken manure and microorganism beneficial microbial agents, and fermenting the mixture to obtain the mineral ecological organic fertilizer. The method is green and environment-friendly and realizes the harmless and resourceful treatment of the sludge; the obtained mineral organic fertilizer is capable of obviously improving the structure of soil, enabling the volume-weight of soil to be reduced, the holes of soil to be increased and the ventilation and water permeability of the soil to become good and adjusting the uniform growth of crops and has a good controlled release effect, thus the quality of the crops is improved.

The invention relates to a catalytic ozonation treating apparatus and process for refractory organic wastewater. The apparatus comprises a catalytic oxidation tower, an ozone generator connected with the bottom inlet of the catalytic oxidation tower and a tail gas treating and recycling system connected with the top outlet of the catalytic oxidation tower, wherein the outlet of the tail gas treating and recycling system is connected with the inlet of the ozone generator, and the tail gas treating and recycling system comprises a carbon dioxide absorbing tower, a drying unit and an oxygen storage tank which are successively connected. According to the invention, high-concentration ozone is generated from pure oxygen via the ozone generator, macro-molecular refractory organic pollutants in the organic wastewater is subjected to catalytic ozonation in the catalytic oxidation tower, and tail gas is treated by the tail gas treating and recycling system and then cyclically used as a gas source for the ozone generator; carbon dioxide and steam are removed through the tail gas treating and recycling system, so tail gas is purified, secondary pollution is avoided, the utilization rate of oxygen is improved, and treating cost is reduced.