66results about How to "Prolong contact reaction time" patented technology

The invention relates to a preparation method of maleic anhydride graft polypropylene wax, which is characterized by comprising the following steps: heating and melting polypropylene wax in a kettle by using a heating system and a mixer of a reaction kettle; mixing a maleic anhydride graft monomer with the addition of 1.5 to 8.0 of polypropylene in percentage by weight by controlling the mixing rate from 120 r / min to 250 r / min at reaction temperature from 100 DEG C to 250 DEG C; adding an initiating agent with the addition of 1 / 30 to 1 / 10 of the adding quantity of maleic anhydride and a graft active agent with the addition of 1:3 to 2:1 of the weight of the maleic anhydride at reaction time from 0.5 hour to 10 hours, thereby completing the graft reaction of the maleic anhydride; and then cooling, pelleting or crushing maleic anhydride graft polypropylene wax so as to complete the preparing process of the maleic anhydride graft polypropylene wax. The invention also discloses a relative device. The preparation method of maleic anhydride graft polypropylene wax has the advantages of simple and reasonable technology, easy manufacture, low production cost, simplified product formula, and the like.

The invention discloses a device for wastewater treatment and sludge reduction and stabilization and a wastewater treatment method thereof, and belongs to the field of equipment and methods for sewage treatment. The device comprises a submerged biological packed bed and an earthworm ecological filter, wherein the submerged biological packed bed is supported above the earthworm ecological filter through a support frame; an upper-layer sludge aggregation zone is arranged at the bottom of the submerged biological packed bed; a sludge valve No.1 is arranged at the bottom of the upper-layer sludge aggregation zone; the earthworm ecological filter is positioned under the upper-layer sludge aggregation zone; a lower-layer sludge aggregation zone is arranged at the bottom of the earthworm ecological filter; a sludge valve No.2 is arranged at the bottom of the lower-layer sludge aggregation zone. The device for wastewater treatment and sludge reduction and stabilization and the wastewater treatment method have the advantages that a two-stage structure of the submerged biological packed bed and the earthworm ecological filter is constructed to alternatively treat sewage, and under the premise of low operation cost, the efficient removal of organics and nutrient substances in wastewater is realized.

The invention belongs to the field of organic chemical wastewater treatment, and in particular relates to a novel high-efficiency ozone catalytic oxidation stirring reactor which is obtained by reforming the traditional ozone reactor and is used for treating chemical wastewater. By reforming the internal structure of the ozone reactor (such as arranging a guide cylinder and additionally arranginga stirring device), the ozone residence time is prolonged; furthermore, ozone is combined with a catalytic packing loaded with activated carbon and nano-iron (a mixture of nano zero-valent iron and nano iron oxide) for use, so that the ozone utilization rate is improved, and the process energy consumption and the treatment cost are reduced.

The invention discloses a bio-purification and photocatalysis duplex sewage treatment tower, which is characterized by comprising a tower body device, an ecologic filter layer device, a photocatalysis reaction device, a mud separation net and a water inlet / outlet device. The tower body is of a hollow cylindrical structure, the upper end is provided with a top cover, the ecologic filter layer is fixed in the middle of the tower body and is divided into a first filter layer, an ecologic filler ball layer and a second filter layer from top to bottom, which are divided and supported by partition plates; a photocatalysis reaction tank is arranged on the upper part of the ecologic filter layer and is internally provided with multilayered annular photocatalysis water permeable walls and ultraviolet lamp tubes, and the mud separation net is arranged at the lower part of the tower body; a water inlet pipe is arranged at the side wall of the lower part of the tower body; the upper end of a water outlet pipe is connected with the bottom of the photocatalysis reaction tank; an opening in the lower end of the water outlet pipe is formed in the bottom of the tower body. The bio-purification and photocatalysis duplex sewage treatment tower has the advantage that various pollutants in sewage can be effectively removed after duplex treatment of bio-purification and photocatalysis.

The invention provides an atomic layer deposition process control method for corrosive and hazardous gaseous precursors. Precise control and safe ordered injection of the gaseous precursors are realized. A gaseous precursor capacity adjustable device is additionally arranged between two precursor injection pneumatic valves, the injection amount of the precursors is accurately controlled, and a precursor injection pneumatic valve, a vacuum pump air exhaust pneumatic valve and a carrier gas purging pneumatic valve are opened and closed in order through valves, so that atomic layer deposition processes such as alternate and ordered injection and quasi-static diffusion adsorption reaction and removal of excessive precursors and reaction products are realized respectively. The atomic layer deposition process control method can realize the accurate control of the amount of the corrosion and dangerous gaseous precursors in the atomic layer deposition process, reduce the use potential safety hazard of the precursors, and reduce the environmental pressure and the use cost.

The invention discloses a device for crystallizing and granulating struvite by strengthening gas-liquid fluidization. The device is provided with a reactor main body and a settling zone, wherein the reactor main body comprises a crystal generating zone and a fluidizing layer from bottom to top, wherein an exposure opening is formed in the lower part of the crystal generating zone, and a water inlet is formed in the upper part of the exposure opening. The fluidizing layer is communicated with the settling zone by a diversion pipe; the bottom of the settling zone is connected with the bottom of the crystal generating zone through a refluxing pipe; a horizontal separation board is arranged at the lower-middle part of the settling zone; an overflow weir is arranged at the right-upper part of the settling zone. The device disclosed by the invention has the advantages that firstly, the device can realize strengthening of the gas-liquid fluidization and promote forming and growth of a struvite crystal; granulation of the struvite crystal is finally realized, the settling property of the struvite crystal is improved, the concentration of suspended matters in effluent is reduced, and clarification of the effluent is ensured; secondly, the mass transfer effect in the device can be enhanced by strengthening the circulation, the reaction efficiency is improved, the nitrogen and phosphorus removal effect of wastewater is enhanced, and efficient recovery of nitrogen and phosphorous from the wastewater is realized; thirdly, large-granular struvite can be conveniently recovered.

The invention discloses a solar device used for photoelectrocatalysis oxidation of organics in water, which pertains to the field of advanced photocatalytic oxidation technology for water treatment in environmental chemical engineering, more particularly relates to a photoelectrocatalysis organic water treatment device which can directly utilize the ultraviolet light and the visible light in the sunlight. The device comprises a shell body 1, a solar photocatalytic anode 2, a carbon-material cathode 3, a Ti-based stibium-doped tin dioxide electrode 4 and deflection baffles 10. A plurality of the parallel deflection baffles 10 arranged in the device cause the reaction device to have the functions of a plate-column water treatment device, and the number of the baffles can be designed, calculated and determined according to the waste water entrance depth and the requirements on the quality of outflow water. The device has simple structure, directly utilizes the clean and renewable solar energy and clean electrical energy, is especially suitable for in-water reaction rate control and the treatment of organics which are hard to be oxidized, has high oxidation efficiency and is environment-friendly.

The invention discloses a gas circulation biological bubble tower methane / natural gas biological desulfuration method and belongs to the technical field of environment-friendly pollution treatment. The gas circulation biological bubble tower methane / natural gas biological desulfuration method comprises the steps of mixing methane / natural gas containing hydrogen sulfide with air or oxygen, allowingmixed gas to enter into a reactor for purification through a bubble diffuser from the bottom of a biological bubble tower reactor, dividing the purified methane / natural gas into two parts, allowing one part to circularly back flow through a gas circulation pump and enter the reactor with the mixed gas, and directly discharging the other part from the top of the reactor. The method basically converts H2S into elemental S, and significantly reduces post-treatment cost and secondary pollution risks; in particular, the methane is purified circularly; the desulfurization efficiency is greatly improved; and a yield of elemental sulfur is increased.

The invention relates to an inclined pipe type water distribution mechanism which comprises an air flotation tank, wherein a contact chamber is arranged at the front end of the air flotation tank, a separation chamber is arranged behind the contact chamber, and a sewage distribution tank is arranged at the front end of the contact chamber; water distribution pipes are arranged below the sewage distribution tank, an outlet of the water distribution pipes points at the tank bottom of the air floatation tank, and the inclined pipe type water distribution mechanism is characterized in that an acute angle is formed between the water distribution pipes and the horizontal plane of the tank bottom of the air floatation tank, and a dissolved gas water main pipe is mounted above one end of the outlet of the water distribution pipes. A plurality of release devices are uniformly distributed on the dissolved gas water main pipe. A plurality of water distribution holes are distributed on the lower surfaces of the water distribution pipes. The inclined pipe type water distribution mechanism has the following advantages: 1) the adoption of inclined pipes for water distribution can greatly increase the contact reaction time between raw water and dissolved gas water; 2) the size of the inclined pipes is far larger than the diameter of the traditional water distribution small holes, thereby effectively reducing the probability of non-uniform water distribution caused by blockage of the water distribution main pipe; and 3) as each water distribution inclined pipe corresponds to one release device, the blind area phenomenon of the contact chamber can be avoided.

The invention discloses a process for synthesizing ethyl chloride. In a closed reactor, an ethyl chloride product can be obtained from ethanol and hydrogen chloride gas under the catalytic effect of AlCl3-ZnCl2 double component catalyst by gradually heating for reaction, releasing step by step and recovering. The high activity of AlCl3-ZnCl2 double component catalyst is used in the method, reaction temperature and by-product diethyl ether are reduced, and the yield of the ethyl chloride is increased to above 95%; by the use of the hydrogen chloride for replacement of industrial hydrochloric acid, mother liquor and distillate are directly continuously applied, energy consumption for distillation distillate recovery and hydrogen chloride loss are effectively reduced, environment pollution caused by production of a lot of high salt wastewater and organic waste acid can be avoided; in addition, by use of a closed staged heating reaction way, a catalytic substitution reaction is performed in a liquid phase system, substrate contact reaction time is increased, ethanol conversion rate reduction caused by too fast escaping of excessive hydrogen chloride from the reactor can be avoided, the consumption increase of the hydrogen chloride is avoided, and the atmospheric pollution is reduced.

The invention discloses a lime slurry jetting circulating fluid bed semi-dry process desulfurizer which comprises a desulfurization reaction column, a gas-solid separator and a draught fan, wherein the lower part of the desulfurization reaction column is provided with a lime slurry nozzle and a fume inlet; an after-reaction gas outlet of the desulfurization reaction column is communicated with the gas-solid separator through a spoiler; and the spoiler is positioned on the upper part of the after-reaction gas outlet of the desulfurization reaction column. In the invention, the upper part of the gas outlet of the desulfurization reaction column is provided with the spoiler which can forcibly mix the gas-solid mixture discharged by the desulfurization reaction into a turbulent condition, thereby strengthening the desulfurization reaction of the mixture; and meanwhile, part of unreacted slurry particles return to the desulfurization reaction column for reaction after colliding with each other in the spoiler, thereby enhancing the desulfurization efficiency. The desulfurizer can reduce the working load of the gas-solid separator under the condition of high fume flow on the premise of ensuring the separating effect, and is applicable to high-flow fume desulfurization. When the fume flow is low, the turbulence is strengthened by the spoiler, thereby prolonging the contact reaction time and enhancing the desulfurization efficiency.

The invention relates to desulfurization and denitrification equipment. The desulfurization and denitrification equipment comprises an ash removal device, an oxygen regulation device, an absorption tower and an absorption liquid circulation tank, wherein the ash removal device, the oxygen regulation device and the absorption tower are sequentially communicated through a flue gas pipeline, the front end of the ash removal device is connected with a flue gas inlet, a flow regulating valve is arranged between the flue gas inlet and the ash removal device, a first temperature control device is arranged between the ash removal device and the oxygen regulation device, a second temperature control device is arranged between the oxygen regulation device and the absorption tower, an induced draft fan is arranged between the second temperature control device and the absorption tower, a first valve is arranged between the first temperature control device and the ash removal device, and the absorption liquid circulation tank is connected with the absorption tower; granular substances in the flue gas can be sufficiently separated, the moving path of the flue gas in the absorption tower is prolonged, the reaction time is prolonged, and the flue gas is subjected to sufficient desulfurization and denitrification reaction, so that the flue gas reaches the emission standard.

The invention discloses a dual-mode solution humidifying fresh air conditioning unit and an air humidity regulation and control method, and belongs to the field of air-conditioner dehumidification. The dual-mode solution humidifying fresh air conditioning unit comprises a heat exchange unit, a solution regeneration unit and a fresh air humidifying unit. The heat exchange unit comprises a first heat exchange loop which is composed of a compressor, a first heat exchanger, a condenser and a second heat exchanger. The solution regeneration module further comprises a second heat exchange loop which is composed of the compressor, the condenser and the second heat exchanger. The first heat exchange loop and the second heat exchange loop can be switched through an electromagnetic valve. A solution in the solution regeneration unit flows through the first heat exchanger and then performs solution regeneration through a first spraying device, and the regenerated solution is supplied to the fresh air humidifying unit through the second heat exchanger. The air conditioning unit is simple in structure and can work in different modes according to the air humidity, so that the purposes of cooling and air humidity adjustment are achieved, and the overall utilization rate of an air-conditioner is increased.

The invention discloses a multi-cavity catalytic cracking gasification furnace which comprises a shell, an inverted cone-shaped furnace inner container, a furnace cover, a blanking rod, partition plates, an electric heating wire and a fan, wherein the fan is fixed on a bottom plate; a heat insulating material layer is arranged inside the shell; a cavity is formed between the heat insulating layerand the inverted cone-shaped furnace inner container and is divided into a combustible gas storage chamber, a catalytic reaction chamber and a tar collection chamber by an upper partition plate and alower partition plate; the catalytic reaction chamber is divided into four catalytic regions by a vertical partition plate; a nickel-based catalyst is filled in the catalytic reaction chamber on the side close to the cone-shaped furnace inner container; composite sealing is adopted between the furnace cover and the furnace body; and the blanking rod and the furnace cover are fastened and sealed by using two semicircular sealing blocks. Through the gasification furnace, easily condensable tar and high molecular gas in primary gasification gas are further cracked into small molecular combustible gas, so that the efficiency of the furnace is increased; the sealing problem of the gasification furnace is solved; and the furnace has a compact structure, is clean, sanitary and convenient to operate and is particularly suitable for rural households.

The invention relates to a sludge reduction treatment system based on ozone micro-nano bubbles and a method thereof. The treatment system comprises a water tank, an ozone generator, a micro-nano bubble generator, a sludge reactor, a tail gas absorption tank and a sludge collection tank, the water tank is connected with the micro-nano bubble generator through a liquid conveying pipe, the ozone generator is connected with the micro-nano bubble generator, a discharging nozzle of the micro-nano bubble generator is connected with the sludge reactor, a reaction gas outlet in the upper portion of thesludge reactor is connected with the tail gas absorption tank, and a sludge outlet in the bottom is connected with the sludge collection tank. The treatment method comprises the following steps: preparing an ozone micro-nano bubble water system; injecting ozone micro-nano bubble water into the sludge reactor at a high speed; preparing a solution containing Fe <2+> or Mn<2+>, and introducing the solution into the sludge reactor for sludge oxidation treatment; and introducing tail gas into the tail gas absorption tank for tail gas absorption. According to the method, the utilization rate of theozone oxidant can be increased, the sludge reduction treatment efficiency is improved, and secondary pollution is avoided.

The invention discloses a sludge drying tail gas treatment system and a sludge drying tail gas treatment method. The sludge drying tail gas treatment system comprises a sludge drying machine, an induced draft fan, a cyclone separator, a spray tower, an air blower, a sewage storage tank, a nitrification tank, a denitrification tank and an activated carbon absorption tower, wherein the sludge dryingmachine, the induced draft fan, the cyclone separator and the spray tower are sequentially connected in series; the spray tower is communicated with the nitrification tank through the air blower; thesewage storage tank, the denitrification tank, the nitrification tank and the activated carbon absorption tower are sequentially connected in series. The invention also correspondingly provides the sludge drying tail gas treatment method. The method comprises the following steps: carrying out chemical oxidation treatment on the tail gas, carrying out biochemical degradation, performing adsorbingwith activated carbon, and conducting discharging. According to the invention, the technical effects of treating the waste with the waste and cooperatively treating tail gas and waste water are finally achieved, up-to-standard discharge of sludge drying tail gas and waste water is realized, energy conservation and environmental protection are realized, secondary pollution is not generated, and meanwhile, the method also has the advantages of decreasing equipment occupied area and equipment maintenance workload and reducing equipment comprehensive operation cost.

The invention discloses a water circulating aquaculture system which comprises an aquaculture pond, a rotary disc type filter, a water collecting pond, a water pump, an integrated bio-filter, an ultraviolet disinfector and an aerator. The rotary disc type filter, the water collecting pond, the water pump, the integrated bio-filter and the ultraviolet disinfector are sequentially communicated with a water outlet of the aquaculture pond via flow channels, a water outlet of the ultraviolet disinfector is communicated with a water inlet of the aquaculture pond via a flow channel, the internal liquid level of the ultraviolet disinfector is higher than the internal liquid level of the aquaculture pond, the internal liquid level of the integrated bio-filter is higher than the internal liquid level of the ultraviolet disinfector, the internal liquid level of the aquaculture pond is higher than the internal liquid level of the rotary disc type filter, the internal liquid level of the rotary disc type filter is higher than the internal liquid level of the water collecting pond, the integrated bio-filter comprises an immersed bio-filter, at least one rain falling bio-filter and pipelines, and the immersed bio-filter and the rain falling bio-filters are communicated with one another via the pipelines. The water circulating aquaculture system has the advantage that excellent treatment effects for reducing ammonia nitrogen and nitrite in water can be realized by the water circulating aquaculture system.

The invention discloses an aerosolizable botulinum toxin type A AHc subunit vaccine dry powder inhalant. The AHc subunit vaccine dry powder is successfully prepared by a spray freeze drying method. The mass median aerodynamic diameter (MMAD) is close to 2.5 [mu]m. The particles are spherical, and loose and porous in shape, and the distribution of particle size is uniform. The particle size of therange is beneficial to the deposition of the vaccine to the deep part of the lung, the contact reaction time between the antigen and the mucosa tissue is increased, and the immune protection effect isimproved. The recombinant AHc subunit vaccine dry powder prepared by the invention meets the requirements of lung delivery immunity, can protect mice against 1440 times LD<50> BoNT / A complex attackthrough lung delivery immunity, lays a foundation for the development of botulinum toxin subunit vaccine dry powder vaccine and the research of lung delivery immunity protection effect, and provides an advanced technical scheme for the development of inhalation dry powder vaccine.

The invention provides a low-nitrogen oxide incineration technology and device. The low-nitrogen oxide incineration technology and device are used for incineration disposal of dehydrated dry mud. Thelow-nitrogen oxide incineration technology comprises the steps that materials are mixed, specifically, the dehydrated dry mud, coal, recovered ammonium sulfate and limestone powder are put into a mixer, the recovered ammonium sulfate is prepared from waste liquid containing ammonium sulfate, the dehydrated dry mud, the coal, the limestone powder and the recovered ammonium sulfate are mixed for 0.1-1 hour, and thus a mixture is obtained; the limestone powder is decomposed, specifically, the limestone powder is incinerated to be decomposed into calcium oxide and carbon dioxide; ammonia is generated, specifically, the mixture is put from a mixture inlet into an incinerator, and the ammonium sulfate and the calcium oxide in the mixture react to generate the ammonia and calcium sulfate; and nitrogen oxide is reduced, specifically, flue gas is generated by incineration of the dehydrated dry mud and rises from bottom to up, the flue gas and the ammonia make contact to be mixed, the flue gas includes the nitrogen oxide, the ammonia and the nitrogen oxide are subjected to redox reaction, the nitrogen oxide is reduced to generate nitrogen, and the nitrogen and the carbon dioxide generated inthe limestone powder decomposition step are exhausted from a flue gas outlet of the incinerator.

The invention discloses an environment-friendly industrial waste gas purification device, which comprises: a shell; a waste gas conveying piece comprising a waste gas conveying header pipe and a first bubble crushing turbulent flow piece, wherein the waste gas conveying header pipe and the first bubble crushing turbulent flow piece are both arranged on the shell; a first spraying piece comprising a partition plate, a primary spraying branch pipe, a primary spraying pipe, a primary spraying head, a primary spraying header pipe, a booster water pump and a booster water suction pipe; a spraying piece comprising a waste gas relay pipe, an extended mixing pipe, a spraying branch pipe, a spraying pipe, a spraying head and a spraying header pipe, wherein the waste gas relay pipe is arranged on the partition plate; and a second spraying piece comprising a second bubble crushing turbulence piece, a spraying support frame, a secondary spraying branch pipe, a secondary spraying head, a secondary spraying header pipe and a demister. The environment-friendly industrial waste gas purification device is novel in design thought, reasonable in structure, small in occupied area, reasonable in waste gas desulfurization and denitrification process, high in desulfurization and denitrification efficiency, low in desulfurization and denitrification liquid consumption and low in production cost.

The invention relates to a preparation method of maleic anhydride graft polypropylene wax, which is characterized by comprising the following steps: heating and melting polypropylene wax in a kettle by using a heating system and a mixer of a reaction kettle; mixing a maleic anhydride graft monomer with the addition of 1.5 to 8.0 of polypropylene in percentage by weight by controlling the mixing rate from 120 r / min to 250 r / min at reaction temperature from 100 DEG C to 250 DEG C; adding an initiating agent with the addition of 1 / 30 to 1 / 10 of the adding quantity of maleic anhydride and a graftactive agent with the addition of 1:3 to 2:1 of the weight of the maleic anhydride at reaction time from 0.5 hour to 10 hours, thereby completing the graft reaction of the maleic anhydride; and then cooling, pelleting or crushing maleic anhydride graft polypropylene wax so as to complete the preparing process of the maleic anhydride graft polypropylene wax. The invention also discloses a relativedevice. The preparation method of maleic anhydride graft polypropylene wax has the advantages of simple and reasonable technology, easy manufacture, low production cost, simplified product formula, and the like.

The invention provides a desulfurization tower used for desulfurizing of hydrogenation dry gas. The desulfurization tower comprises a tower body, a first material filling assembly and a second material filling assembly, wherein the tower body is provided with a desulfurizing reaction chamber, a desulfurizing agent inlet and an air outlet which communicate with the desulfurizing reaction chamber are formed in the upper end of the tower body, a desulfurizing agent outlet and an air inlet which communicate with the desulfurizing reaction chamber are formed in the bottom of the tower body, the first material filling assembly and the second material filling assembly are sequentially arranged in the desulfurizing reaction chamber from top to bottom, thus a desulfurizing agent sequentially flowsthrough a first material filling layer of the first material filling assembly and a second material filling layer of the second material filling assembly from top to bottom, and reacts with the hydrogenation dry gas flowing from bottom to top on the first material filling layer and the second material filling layer in a contact mode, and thus desulfurizing is conducted on the hydrogenation dry gas. According to the desulfurization tower used for desulfurizing of the hydrogenation dry gas, the problems of low desulfurization load and poor desulfurization capacity of a desulfurization tower in the prior art are solved.

The invention discloses an electrical ultrasonic atomization wet desulfurization spray nozzle and the application thereof; the spray nozzle comprises an ultrasonic generation device arranged in a shell body; the inside of the shell body is divided into an ultrasonic atomization cavity and an ultrasonic generation cavity; the shell body is provided with a slurry inlet channel; the slurry inlet channel is communicated with the ultrasonic generation cavity, and the slurry inlet channel and the axis of the shell body are arranged tangentially in 45 degrees; limestone slurry passes through the slurry inlet channel, forms a layer of thin film under the action of surface tension and viscous force when flowing into the ultrasonic generation cavity, simultaneously the liquid is crushed and atomized through the mechanical oscillation for a transducer converts high-frequency electromagnetic oscillation into liquid, and then the limestone slurry produces smaller particles under the action of ultrasonic oscillation so as to achieve better atomization effect; and the slurry inlet channel and the axis of the shell body are arranged tangentially in 45 degrees, so that the limestone slurry entering the ultrasonic atomization cavity produces high-speed cyclone, thereby effectively prevent the erosion of the slurry particles to the inner wall of the shell body of the spray nozzle, reducing resistance, and simultaneously solving the blockage problem of the spout of the spray nozzle.

The invention discloses a method for treating nitrobenzene wastewater by using ozone biological aerated filter and application thereof and belongs to the field of sewage treatment. The treatment method comprises the following steps: (1) constructing a biological filter; (2) starting an air aerated biological filter; (3) starting an ozone biological aerated filter; (4) running the ozone biological aerated filter. The catalytic oxidation and the biological oxidation of ozone zeolite are integrated, the strong oxidative of the ozone is used for opening the ring of the nitrobenzene, the nitrobenzene after ring opening is used as an easily degradable matrix to participate in co-metabolism degradation of nitrobenzene, the removal effect of the nitrobenzene is improved, the biological film growing on the zeolite filler at the upper part of a reactor is used for degrading oxidation products, and the efficient degradation of the nitrobenzene is realized in the same reactor. Through the adoption of the biological aerated filter disclosed by the invention, removable efficiency of the nitrobenzene can reach 90% or above; the biological aerated filter has the advantages of small floor area, high nitrobenzene removal efficiency, convenient starting and simple operation.

The invention discloses a bio-purification and photocatalysis duplex sewage treatment tower, which is characterized by comprising a tower body device, an ecologic filter layer device, a photocatalysis reaction device, a mud separation net and a water inlet / outlet device. The tower body is of a hollow cylindrical structure, the upper end is provided with a top cover, the ecologic filter layer is fixed in the middle of the tower body and is divided into a first filter layer, an ecologic filler ball layer and a second filter layer from top to bottom, which are divided and supported by partition plates; a photocatalysis reaction tank is arranged on the upper part of the ecologic filter layer and is internally provided with multilayered annular photocatalysis water permeable walls and ultraviolet lamp tubes, and the mud separation net is arranged at the lower part of the tower body; a water inlet pipe is arranged at the side wall of the lower part of the tower body; the upper end of a water outlet pipe is connected with the bottom of the photocatalysis reaction tank; an opening in the lower end of the water outlet pipe is formed in the bottom of the tower body. The bio-purification and photocatalysis duplex sewage treatment tower has the advantage that various pollutants in sewage can be effectively removed after duplex treatment of bio-purification and photocatalysis.