164results about How to "Reduce dissolved oxygen" patented technology

A process for removing heavy metals and the organic substance difficult to degradate from sewage includes proportioning Fe and Cu, adding cationic surfactant modified zeolite, stirring, loading the mixture in filter pool, regulating pH value to 4.5-11, reaction, and regulating pH value to 8-9 to generate Fe(OH)3 as flocculant, which can coagulate the suspended solid and colloid and absorb and soluble pollutants for depositing them. Its advanrtages are high power, effect and high speed.

The invention discloses a method for controlling cleanliness of molten steel, and a smelting control method capable of preventing a molten steel gap from nodulation during sulphur and aluminum contained steel pouring, and belongs to the field of smelting. The method for controlling cleanliness of the molten steel comprises the following steps that blast furnace molten iron without desulfuration issubjected to converter smelting, and during converter tapping, deoxygenation, alloying and tapping wash heat are carried out in sequence for carrying out inclusion removal treatment. Through an LF furnace, converter tapping is subjected to refining under the condition that acid soluble aluminum is not adjusted, that is, during tapping, a slagging constituent is added for controlling refining slagcomposition, and after the slag is dissolved, deoxygenation is carried out through a deoxidizing agent. Through the process, the content of sulphur in the molten steel is monitored, ferrous sulfide is used for adjusting the content of sulphur in the molten steel to the first target value, an RH furnace is used for refining LF furnace tapping, in the process, according to the content of the acid soluble aluminum of LF furnace tapping, selective aluminum feeding is carried out to adjust the content of the aluminum to the second target value, and after RH furnace refining is finished, calcium treatment is carried out. According to the process, the cleanliness of the molten steel can be improved, the nodulation problem during molten steel pouring can be avoided, and the stopper bar curve rising can be controlled.

A zero-valent iron and biochar composite chemical for in-situ remediation of groundwater contaminated with chlorinated hydrocarbons is prepared from materials in percentage by weight as follows: 5%-30% of zero-valent iron powder, 8%-30% of a biochar source, 35%-85% of water, 0.1%-1% of a stabilizer, 1.5%-3% of a thickener, 0.3%-1% of an emulsifier and 0.01%-0.1% of a micronutrient source. The required raw materials are uniformly mixed by mixing equipment with high shearing for 15-30 min, and composite slurry which has good fluidity, is conducive to in-situ injection and can be stably stored is obtained. The prepared zero-valent iron and biochar source composite chemical has excellent fluidity and migration and diffusion capabilities and has a good remediation effect on complex contaminated sites containing both unsaturated and saturated chlorinated hydrocarbons. Besides, the selected raw materials are economic and available, the cost of the chemical is greatly reduced, and large-scale remediation of actual sites is facilitated.

The invention relates to the technical field of tin plating of copper wires, in particular to a circulating tin plating process and device. The circulating tin plating process comprises the following steps of: setting speed and stabilizing speed and tension in a tension buffer area; annealing in a high-temperature annealing area at high temperature; initially cooling in an annealing and cooling area; pre-plating tin in an inlet tin heating area; finally plating tin in an outlet tin heating area; scraping residual tin by using a tin plating mold for sizing; protecting reducing gas to deoxidize liquid tin and protecting a wire rod from being oxidized; cooling a hot plated tin wire with water; scraping water on the tin-plated wire with rubber; scraping water and possible tin beads by using a mold; drying residual water by using a drier; cooling the tin-plated wire to room temperature by using a cooling wind scoop; and rolling into a finished product, and the like. By adopting the circulating tin plating process, the product quality of the tin-plated wire is ensured, use of a soldering flux causing pollution can be avoided, noble rare earth metals are avoided or reduced, a large amount of electric energy is saved, waste of tin dross is reduced, operation is simplified and concealed danger of quality is reduced.

The invention discloses a seawater-based fracturing fluid for fracturing a sea high-temperature oil-gas reservoir and relates to the technical field of cross-linked gel fracturing fluid. The seawater-based fracturing fluid comprises a base solution, a cross-linking agent and a thickening agent, wherein the base solution comprises the components (in percentage by weight) in terms of the weight of the prepared seawater-based fracturing fluid total solution as follows: 0.3%-0.8% of thickening agent, 0.1%-0.3% of pH regulating agent, 0.1%-0.5% of discharge aiding agent and the balance being seawater; relative to the mass fraction of the base solution, the cross-linking agent is 0.4%-0.6%; and the thickening agent refers to guar gum, carboxy-methyl hydroxypropyl guar gum, hydroxypropyl guar gum, fenugreek gum or sesbania gum. The seawater-based fracturing fluid is adopted, so that the dissolving speed of the thickening agent is quick, and therefore, direct mixing and continuous constructing can be realized, and therefore, the seawater-based fracturing fluid is in particular suitable for the fracturing construction of the sea high-temperature oil-gas reservoir. Meanwhile, the fracturing fluid can be continuously sheared for 90 minutes under the conditions of 150 DEG C and 170s<-1>, so that the viscosity is kept to be 70mPa.s or more.

The invention provides a method and a device of a composite aeration MBR (membrane bio-reactor). The method and the device solve the problems that the existing MBR system is poor in aeration effect, low in oxygen transmissibility and great in aeration energy consumption. The device comprises a membrane pool used for MBR reaction, a membrane component used for intercepting sludge and filtered sewage, a water inlet pump used for providing influent, a micropore aeration pipe used for providing micropore aeration, a blower used for providing gas for the micropore aeration pipe, a jet aerator used for providing jet aeration, a circulating water pump used for circulating water supply of the membrane pool and providing a liquid phase for the jet aerator, and a water outlet pump used for sucking filtered effluent and connected with the membrane component. The device and the method are simple in structure and reasonable in arrangement; a reasonable gas-water ratio can be formed; the transmission efficiency of oxygen is improved; the surface of a membrane is scoured; concentration polarization is avoided effectively; the pollution of the membrane is reduced; the service life of the membrane is prolonged; the energy consumption is saved; and the device and the method are suitable for treatment of large and medium industrial waste water and high-difficulty and degradation-resistant waste water.

The invention relates to a microbial fuel cell constructed wetland device. The device consists of a hydrolysis acidification pool, a microbial fuel cell constructed wetland main body and an external circuit that are connected in order. The microbial fuel cell constructed wetland main body comprises a gravel water distribution layer, an anode area, an oxygen producer layer, a cathode area and an aquatic plant from bottom to top in order. The lower part on one side of the microbial fuel cell constructed wetland main body is provided with a water inlet, the other side top is equipped with a wateroutlet, the water inlet is communicated with a water outlet at the lower part on one side of the hydrolysis acidification pool through a pump and a pipeline, and a water inlet at the lower part on the other side of the hydrolysis acidification pool is communicated with a sewage inlet pipe. The external circuit consists of an anode, a cathode and a copper core lead connected to the anode and cathode, and a circuit switch is in tandem connection to the copper core lead. The wetland device provided by the invention has the characteristics of simple structure and convenient operation, and by regulating the electrode dissolved oxygen environment, can show excellent power production efficiency while strengthening the constructed wetland sewage treatment effect.

The present invention discloses a composite flow baffling water treatment biomembrane reactor, which comprises a water inlet, a water outlet and a vent nozzle, and is characterized in that a reactor is divided into relatively independent three zones such as an anoxia zone, an aerobic zone and a flat flow zone in a rectangular pool through a flow inlet separator, a flow outlet separator and a flat flow plate; the anoxia zone comprises the horizontally-arranged flat flow plate, the flow inlet separator and the flow outlet separator, wherein the flow inlet separator and the flow outlet separator are connected with the lower sides of both ends of the flat flow plate, and a plurality of flow baffling plates are arranged between the flow inlet separator and the flow outlet separator; a width of the flat flow plate is the same as a width of the pool; a width of the separator is the same as a width of the pool, and a certain distance is arranged between the separator and the left pool wall, the separator and the right pool wall, and the separator and a pool bottom plate; the flow baffling plate has a porous structure, the upper end is connected with the flat flow plate, the lower end is connected with the pool bottom plate, one side is connected with the front pool wall or the rear pool wall, a gap is arranged between the other side and the rear pool wall or the front pool wall, and the adjacent flow baffling plates are arranged in a dislocation manner; the aerobic zone is arranged between the flow outlet separator and the pool wall, the middle is provided with a porous carrier, and an aeration head is arranged on the lower portion of the aerobic zone; and one side of the aerobic zone is provided with a circulating water pump. According to the present invention, the aerobic zone and the anoxia zone are separately and independently controlled, such that mutual interference can be reduced, a good treatment can be provided, a process is easy to operate, and the reactor can be applicable for bioremediations of eutrophication water bodies, aquaculture water bodies and even industrial wastewater.

The invention provides a liquid steel pre-deoxidizing technology in a steelmaking revolving furnace, belonging to the technical field of metallurgical steel making for solving the problem that the common deoxidizing technology of the revolving furnace can not reduce FeO content in the final steel slag of the revolving furnace. The technical scheme is as follows: the technology is carried out on the final liquid steel when revolving furnace semi-steel steel making or revolving furnace liquid-steel steel making. The technology comprises the following steps of: a. at the final smelting of the steel making revolving furnace, adding with carbon-containing deoxidizing materials or silicon-containing deoxidizing materials into slag liquid surface of the revolving furnace; b. after adding the deoxidizing materials into the revolving furnace, injecting nitrogen into the revolving furnace to be taken as power source to carry out pre-deoxidization; and c. after injecting the nitrogen, tapping steel after reaction in the revolving furnace is steady. The technology essentially has the following characteristics of: 1. reducing the corroding of the liquid steel and the steel slag to the furnace lining, the steel tapping hole and the steel ladle of the revolving furnace, and improving service life thereof; 2. reducing alloy materials added in the process of the oxidizing and the steel tappingof the liquid steel with high oxygen content, and improving the absorption of the alloy; and 3. reducing rolling slag or final slag tapping quantity in the process of steel tapping in the revolving furnace; and 4. reducing the yield of oxidation products with high melting point.

The invention relates to a method for preparing a polyperfluorinated ethylene propylene resin, comprising the following steps of: (1) adding deionized water to a reaction kettle and preserving 30-50% of space; (2) charging nitrogen and boiling the deionized water; (3) adding an emulsifier to the reaction kettle, stirring uniformly, adding an initially mixed monomer of tetrafluoroethylene and hexafluoropropylene and thereafter adding an initiator to react; (4) compensating the mixed monomer of the tetrafluoroethylene and the hexafluoropropylene additionally during the reaction and maintaining the reaction kettle at constant pressure; and (5) obtaining the polyperfluorinated ethylene propylene resin after the reaction. The method for preparing the polyperfluorinated ethylene propylene has fast reaction and low cost; the high temperature molten extrudate of the polyperfluorinated ethylene propylene resin in the product has good colour, excellent thermal stress resistance and good processability.

The invention relates to a device and a method for combined treatment of soybean protein wastewater by anaerobic methanogenesis and anaerobic ammonia oxidation and belongs to the technical field of sewage treatment. The device is provided with a water inlet tank, the water inlet tank is communicated with an anaerobic SBR reactor by virtue of a first water inlet pump and a pipeline, the anaerobic SBR reactor is provided with a reaction zone and a top zone, the bottom of the reaction zone is provided with a microporous aeration head communicated with an air compressor, the upper part of the reaction zone is the top zone, a first overflow weir is arranged between the reaction zone and the top zone, the outside of the first overflow weir is communicated with a water outlet pipe and a gas outlet and a gas backflow pipeline are formed in the top of the reaction zone. The method comprises the following steps of 1) inoculating sludge; 2) carrying out start-up phase; and 3) continuously operating. The device and method disclosed by the invention are suitable for treating high-COD and high-ammonia-nitrogen wastewater generated in the production process of soybean protein and are also applicable to the denitrification treatment of high-ammonia-nitrogen industrial wastewater. According to the device and method, process is perfect, operating cost is low, sewage treatment effect is good, and efficiency is high and control is flexible.

The invention discloses a vacuum smelting process for high-manganese high-aluminum high-titanium steel. The whole process mainly comprises a primary smelting stage, a refining stage, an alloying stageand an electrified pouring stage. Carbon particles are added at the primary smelting stage, melting speed is defined, a little Al is added, large-power stirring is performed, and dissolved oxygen inmolten steel is reduced; an adding sequence, a melting rate, a molten steel temperature and heat preservation time of the alloy are combined with in-furnace pressure, a smelting rate, a molten steel temperature and heat preservation time of the alloying stage, so that minimal volatility of Mn and component uniformity of molten steel can be guaranteed. The vacuum smelting process solves manganese,aluminum and titanium oxidization loss, in a production process, of the high-manganese high-aluminum high-titanium steel, and achieves the purpose of precisely controlling chemical components of the high-manganese high-aluminum high-titanium steel. According to the smelting process disclosed by the invention, the Mn yield can be 93% or higher, and the yield of Al and Ti can be 97% or higher.

The invention discloses a device and a method for realizing advanced nitrogen and phosphorus removal of municipal sewage by coupling integrated short-cut nitrification with anaerobic ammonia oxidationdenitrification phosphorus removal. The device comprises a municipal sewage raw water tank and a short-cut nitrification coupling anaerobic ammonia oxidation denitrification phosphorus removal reactor. The method comprises the following steps: firstly, municipal sewage enters a short-cut nitrification coupled anaerobic ammonia oxidation denitrification phosphorus removal reactor, phosphorus-accumulating bacteria and denitrifying phosphorus-accumulating bacteria store an internal carbon source and release phosphorus at the same time, and denitrifying glycogen-accumulating bacteria take in organic matters and convert the organic matters into PHAs to be stored in vivo; then steps of low-oxygen aeration, phosphorus absorbing by phosphorus-accumulating bacteria, converting of part of ammonia nitrogen into nitrite nitrogen are carried out, and anaerobic ammonia oxidation is performed on the residual ammonia nitrogen and the generated nitrite nitrogen to realize denitrification; and the generated nitrate nitrogen is used as an electron acceptor of denitrifying phosphorus-accumulating bacteria to perform excessive absorption of phosphate, thereby achieving the effect of synchronous nitrogen and phosphorus removal. After the stage is completed, anoxic stirring is performed for advanced treatment, and the method can stably realize advanced nitrogen and phosphorus removal of low-C / N municipal sewage.

The invention relates to multi-element internal electrolysis filler and a preparation method thereof. The multi-element internal electrolysis comprises the following components of: 30-60% of iron scraps, 5-18% of copper alloy scraps and 35-52% of active carbon. A process comprises the following steps of: mixing the iron scraps and the copper alloy scraps according to a component ratio; firstly immersing by utilizing an alkaline solution to remove dust and oil on the surfaces of the iron scraps and the copper alloy scraps; repeatedly washing by using clean water; immersing by utilizing an acid solution to remove oxidized films and rusts on the surfaces of the iron scraps and the copper alloy scraps; repeatedly washing by using the clean water; adding the treated iron scraps and the treated copper alloy scraps into a reactor to be mixed uniformly; and adding active carbon grains, and agitating and shaking the reactor until the active carbon grains sufficiently enter gaps among the iron scraps and the copper alloy scraps to prepare the multi-element internal electrolysis filler. A copper alloy is added into the internal electrolysis filler according to a specific ratio to generate multi-element internal electrolysis reaction in the reactor, so as to accelerate organic materials to be degraded. In an pre-treatment application of wastewater, the capability of treating pollutants which are difficult to degrade by the filler is stronger than that the filler used in a conventional internal electrolysis process, and the reaction speed is higher.

The invention discloses a bacillus subtilis strain and applications thereof, and belongs to the technical field of applied biology. The strain is the bacillus subtilis strain QS1 and assigned the accession number CGMCCNO. 17314. A bacillus subtilis preparation is simultaneously disclosed. The preparation includes the bacillus subtilis strain QS1, natural perlite powder and maltodextrin; and a preparation process takes the natural perlite powder as a bacillus subtilis spray carrier, so that aerobic biochemical reaction on the bacillus subtilis in a septic tank can be conveniently performed. Thebacillus subtilis strain QS1 has good decomposition capability for proteins, fibrous substances and oil substances; and the strain can effective remove stink by applying to the septic tank and sewagetreatment, so that the problems of sludge and scum blocking can be effectively prevented, the occurrence of methane and hydrogen sulfide gas can be reduced, and potential safety hazards can be removed.

This invention relates to a final deoxidizer for steelmaking, which is low-C, low-Si, low-P and low-S Al-Mn-Mg-Ca-F alloy. The alloy can be used as the final deoxidizer for steelmaking with good effect, and does not need further refinery of steel. The alloy comprises: C less than or equal to 0.2 wt.%, Si less than or equal to 1.0 wt.%, P less than or equal to 0.02 wt.%, S less than or equal to 0.02 wt.%, Al 40-50 wt.%, Mn 1.0-10 wt.%, Mg 0.1-10 wt.%, Ca 0.1-10 wt.%, and Fe as balance. This invention adopts main frequency induction furnace smelting to produce the final deoxidizer. The final deoxidizer has such advantages as high specific gravity, low melting point, no pulverization, good deoxidation and desulphurization effects, high yield, high fluidity of deoxidized molten steel, no nodulation, easy suspension of deoxidized product, low inclusion total content, high molten steel purity, good steel quality, fine grains, good mechanical properties, and long service life.

The invention discloses a low-energy-consumption membrane bioreactor (LEMB), and relates to the technical field of sewage treatment. The low-energy-consumption membrane bioreactor comprises at least one reaction channel, at least one membrane pool A and at least one membrane pool B. The reaction channels are connected with the bottom of the membrane pool A and the bottom of the membrane pool B. The middle of the membrane pool A and the middle of the membrane pool B are each provided with at least one membrane assembly, and the bottom of the membrane pool A and the bottom of the membrane pool B are each provided with an aeration device. During running, aeration is conducted on the membrane pool A, no aeration is conducted on the membrane pool B, and gas-lifted water flow sequentially flows through the membrane pool A, the membrane pool B, the reaction channels and the membrane pool A so that gas-lifted circulating can be achieved multiple times; dissolved oxygen is provided for the reaction channels through aeration of the membrane pool, and the aerobic environment, the oxygen-deficient environment and even the anaerobic environment sequentially exist in the reaction channels; aeration is alternately conducted on the membrane pool A and the membrane pool B regularly so that bidirectional flushing of membranes and flow direction conversion of a reaction area can be achieved. The membrane gas flushing aeration amount is reduced by 50%, the biochemical aeration amount is reduced by 70-100%, the energy consumption of a liquid circulating pump is lowered by 100%, and the energy conservation effect is remarkable.

The invention relates to a device and a method for purifying, deoxidizing and decarbonizing internal generator cooling water. The device provided by the invention comprises an internal generator cooling water purifying unit and a two-stage membrane deoxidizing and decarbonizing unit, wherein the internal cooling water purifying unit is composed of an RNa type cation exchange tower, an RH type cation exchange tower, a first ROH type anion exchange tower, a second ROH type anion exchange tower, a precise resin trap, a flow regulation and control system and a water quality monitoring system; the two-stage membrane deoxidizing and decarbonizing unit is composed of an intermediate water tank, a circulating water pump, a compressed inert gas system, a gas-liquid membrane two-stage separation system, a gas monitoring system and a booster water pump. The device and the method provided by the invention are used for directly or indirectly and comprehensively regulating and controlling such indexes of internal cooling water as pH value, conductivity, copper content, dissolved oxygen and the like so as to prevent the corrosion of a generator copper conductor and ensure the safe and stable operation of a generating set.

A SiBaSrCaMgFe alloy used as deoxidant in smelting steel contains Si (40-60 wt.%), Ba (10-28), Sr (1-8), Ca (1-15), Mg (5-20) and Fe (rest). Its advantages are high deoxidizing power, sure desulfurizing effect and low cost.

A method and an apparatus for manufacturing a beverage capable of eliminating air bubbles formed in the beverage without impairing the flavor of the beverage. The beverage manufacturing apparatus (20) comprises a beverage deaerating means (3) and a bubble breaking means (5), and these manufacturing method uses the beverage manufacturing apparatus. The apparatus may comprise a beverage sterilizing means (10). The deaerating means may comprise at least one of a deaerator, an inert gas stripping part, and a static mixer, and the bubble breaking means may be a pump capable of breaking the film of air bubbles. In addition, the amount of dissolved oxygen in the beverage after air bubbles are broken is desirably 0.5 ppm or below.

The invention discloses a healthy and environment-friendly laundry ball with a good anti-winding effect. The laundry ball comprises a container, a handle, a locking ring and at least one ceramic washing ball, wherein the ceramic washing ball is located in the container, the ceramic washing ball is similar to a sphere and comprises an upper shell and a lower shell, and at least one through hole is formed in the upper shell and / or the lower shell. The laundry ball is characterized in that a round hole is formed in the bottom of the lower shell; and the handle comprises a connecting component and a handle body which are connected, the connecting component penetrates through the round hole and is tightly sleeved by a locking ring from the inside of the lower shell, and at least one trough hole is formed in the handle body. By virtue of the healthy and environment-friendly laundry ball with the good anti-winding effect, the winding of clothes can be effectively prevented; and the ceramic washing ball can be put in the laundry ball, so that the laundry ball has a good clothes cleaning function.

The invention discloses a rainwater runoff treatment matrix and a rainwater bioretention pond constructed by using the matrix. A pyrite matrix layer on the lower layer of the rainwater runoff treatment matrix comprises pyrite, shell powder and a sandy material which are mixed according to the volume ratio of 10: 5: 85; and the upper biochar matrix layer comprises biochar or activated carbon, organic nutrient soil and a sandy material which are mixed according to a volume ratio of 20: 3: 77. A gravel drainage layer, a transition layer, a pyrite matrix layer, a biochar matrix layer, a sawdust protection layer and a water storage layer are sequentially arranged in a pond body of the rainwater bioretention pond from bottom to top; a perforated water collecting pipe is installed on the gravel drainage layer and connected with a lifting water outlet pipe, and the position height of the lifting water outlet pipe is equal to the top height of the pyrite matrix layer; and an overflow pipe is mounted at the top opening of the pond body. The matrix has the technical effects that the removal rate of common pollutants in the rainwater runoff is increased, the yield of byproducts can be reduced,and the matrix is durable.

The invention provides an unmanned aquaculture oxygenation workstation and an oxygenating method. The unmanned aquaculture oxygenation workstation comprises a floating plate, a driving mechanism, an oxygenation mechanism and an oxygen injection mechanism, wherein the driving mechanism is arranged on the upper surface of the floating plate; the oxygen injection mechanism is annularly arranged on the periphery of the floating plate, and comprises a rubber water ring, a floating bucket, a valve, an air guide pipe, an assembly plate, exhaust duckbills and a three-way valve; the rubber water ring is fixedly arranged on the side wall of the floating plate, and the floating bucket is fixedly arranged in the rubber water ring; the oxygen outlet formed in the side wall of the floating bucket is fixedly connected with the oxygen inlet of the assembly plate through the air guide pipe; four exhaust duckbills which are arranged in an annular shape are fixedly arranged at the bottom of the assemblyplate, and each exhaust duckbill is fixedly connected with the oxygen vent formed in the bottom of the assembly plate; and the three-way valve is arranged on the air guide pipe. The unmanned aquaculture oxygenation workstation and oxygenating method have the advantage of increasing the mixing contact area of air and a water body.

The invention discloses a sludge treatment method. The sludge treatment method comprises the following step: carrying out oxidization treatment on sludge under an acidic condition by adopting persulfate, so as to finish the treatment of the sludge. By adopting the treatment method disclosed by the invention, the sludge is treated under the acidic condition by adopting the persulfate, so that the dehydration performance of the sludge can be improved, and the content of heavy metal in the sludge can also be reduced; the sludge treatment method has the advantages of simple and convenient process, convenient operation, little required equipment, low operation cost, convenience for large-scale industrial production and the like; reducing, stabilized, harmless and subsequent resourceful utilization of the sludge is realized, and the sludge treatment method has a very good application prospect.

The invention provides a novel technique of short-time deep nitrogen removal for the urban sewerage treatment, which aims at limitations of low concentration of activated sludge and high dissolved oxygen in an aerobic tank in the prior art. The technique adopts the anoxic-aerobic combined process, and the most obvious characteristics of technique parameters thereof are high concentration of activated sludge and low dissolved oxygen in the aerobic tank. The activated sludge with high concentration can obviously increase the number of microorganisms when processing polluted water, thereby obviously strengthening the biological treatment capacity, and the aerobic tank with low dissolved oxygen can markedly increase the activity and number of denitrifying bacteria and is favorable for the generation of simultaneous nitrification and denitrification, thereby obviously enhancing the nitrogen-removing effect. The technique has the functional effects that the process can reach extreme high total nitrogen-removing effects within a quite short hydraulic detention time, and can also remove ammonia nitrogen, total phosphorus and other pollutants effectively, and the treatment effect and economic performance reach the international leading level.

The invention discloses a two-stage water inlet weir plate. The two-stage water inlet weir plate comprises a water inlet channel (1); the water inlet channel (1) is provided with a water inlet weir (2); an inner upper edge of the water inlet weir (2) is provided with a flow control weir plate (3); an outer upper edge of the water inlet weir (2) is provided with a uniform water distribution weir plate (4); the flow control weir plate (3) comprises a pedestal (9); stepped teeth (5) are arranged on the pedestal (9); a weir port (6) is arranged between two adjacent stepped teeth (5); the uniform water distribution weir plate (4) comprises a bearer (7) and a weir plate (8); the bearer (7) fixes the weir plate (8) on the outer upper edge of the water inlet weir (2). According to the two-stage water inlet weir plate provided by the invention, the first stage is a flow control weir plate for controlling inlet water, so that each point on the length direction of the water inlet weir has inlet water passing over the water inlet weir; and the second stage is a uniform water distribution weir plate for dispersing inlet water flow, and reducing flow velocity and dissolved oxygen generated by dropping effect.

A high-efficiency denitrification aerobic granular sludge reactor and a sewage treatment method belong to the technical field of sewage treatment. The high-efficiency denitrification aerobic granular sludge reactor comprises a reactor main body for inoculation of aerobic granular sludge, wherein a water inlet is formed in the bottom of the reactor main body; a liquid level meter is arranged at the top of the reactor main body; a water outlet is formed in the middle of the reactor main body; an aeration device is arranged in the cavity of the reactor main body; a ring-shaped flow guide groove is formed in the bottom of the reactor main body; the aeration device is connected with an air blower; the water inlet is connected with a water inlet pump; the water inlet pump is connected with a sewage distribution reservoir; the high-efficiency denitrification aerobic granular sludge reactor further comprises a controller; the controller is in control connection with the water inlet pump, the air blower and the liquid level meter. The sewage treatment method adopts a sequencing batch operation mode; the operation cycle comprises four stages, namely water intake, aeration, settling and water discharge; water intake, aeration and water discharge are all controlled by the controller automatically. The high-efficiency denitrification aerobic granular sludge reactor and the sewage treatment method have the characteristics of high pollutant removal efficiency, low process cost, small occupied area, low sludge yield, easiness for large-scale application and the like.

The invention provides a steam exhaust device of a steam turbine. The steam exhaust device comprises a steam exhaust device casing, wherein the steam exhaust device casing is provided with a steam inlet and a steam outlet, a steam exhaust main flow passage is formed between the steam inlet and the steam outlet, the seam inlet is connected with a steam exhaust cylinder of a low-pressure cylinder of the steam turbine, a deoxygenation spray nozzle is arranged in the steam exhaust main flow passage, and the deoxygenation spray nozzle is connected with a condensed water return pipeline of an air-cooling condenser and can spray condensed water return water of the air-cooling condenser in the steam exhaust main flow passage. The steam exhaust device of the steam turbine has the advantages that the deoxygenation spray nozzle is arranged in the steam exhaust main flow passage, the condensed water sprayed by the deoxygenation spray nozzle is in full contact with steam in the steam exhaust main flow passage, the condensed water with the supercooling degree becomes saturated condensed water after heat exchange with the steam, meanwhile, dissolved oxygen in the condensed water is dissolved out, the dissolved oxygen is exhausted along with the exhausted steam from a steam exhaust opening, and further, the dissolved oxygen quantity in the steam condensed water is reduced. According to the deoxygenation scheme, the steam turbine is adopted for exhausting steam to directly exchange heat with the condensed water, the heating effect of the supercooling condensed water is improved, and the dissolved oxygen quantity of the condensed water can be effectively reduced.

The invention provides a sewage treatment system for an improved A<2>O process, belonging to the technical field of sewage treatment. The sewage treatment system concretely comprises a coarse screen well, a fine screen well, an anaerobic pool, an anoxic pool, an aerobic pool and a secondary sedimentation tank, wherein the anaerobic pool is inoculated with domesticated anaerobic sludge for carryingout an anaerobic ammonium oxidation reaction; the top of the anaerobic tank is provided with an exhaust port; an internal reflux mixed liquid pipeline is arranged between the aerobic pool and the anaerobic pool so as to enable nitrifying liquid to flow back; the reflux ratio of internal reflux is 300-500%; an external reflux sludge pipeline is arranged between the secondary sedimentation tank andthe anaerobic pool, and the reflux ratio of external reflux is 120-200%, and the secondary sedimentation tank is also provided with a residual sewage discharge outlet. The removal of total nitrogen is completed by a combined action of anaerobic ammonium oxidation bacteria and denitrifying bacteria, so that the denitrification ability is high; furthermore, the bacteria do not compete with phosphorus-accumulating bacteria for a carbon source and a growth space, so that the phosphorous removal efficiency is high.