170results about How to "Increase the permeability coefficient" patented technology

The invention discloses a construction method of earth cabin back filling and cabin entering operation during earth pressure shielding. The construction method comprises the following steps: (1) injecting bentonite slurry outside the casing of a shield machine; (2) injecting polyurethane outside the body of a shield to form a seal ring; (3) injecting two-liquid slurry outside a tube piece to form a seal ring; (4) replacing muck in an earth cabin with bentonite, and carrying out muck replacement through the cooperation of the a bentonite injection system and a spiral conveyer; (5) carrying out pressure injecting on low, middle and high-strength cement bentonite mortar slurry, and allowing the bentonite slurry in the earth cabin to form cumulates with certain strength; (6) injecting slurry to a cutting ring of the shield machine and the top of a cutter head; (7) carrying out cabin entering operation by constructors; and (8) closing an earth cabin door after cutter replacement is completed, injecting and back-filling bentonite to the earth cabin to establish an earth pressure balanced mode to restore tunneling. The construction method disclosed the invention breaks through the difficulty of cabin entering operation below a special unstable formation and the difficulty of cabin entering operation under a building during shielding, and has the characteristics of high efficiency, strong operability and the like.

The invention provides a semi-aromatic polyimide material, a preparation method and application thereof, and a gas separation membrane containing the semi-aromatic polyimide material. The semi-aromatic polyimide has a structure shown as a formula I, can be used as a gas separation membrane material, and is obtained by synthesizing a diamine monomer I containing an imide chain link from aromatic dianhydride and aromatic or aliphatic diamine, synthesizing a diamine monomer II containing an imide chain link from alicyclic dianhydride and aromatic or aliphatic diamine, and polymerizing the diaminemonomer I and the diamine monomer II under the action of an initiator. The semi-aromatic polyimide molecular chain provided by the invention has a Troger base structure, and the aromatic ring structure in the main chain is matched with the alicyclic structure, so that the gas separation membrane prepared from the semi-aromatic polyimide molecular chain has good mechanical properties and heat-resistant stability, and has a high permeability coefficient and good selectivity when being used for hydrogen separation and air separation.

The invention discloses a method for displacing coal seam gas via horizontal well mixed gas, relating to the method of coal seam gas coal mining, which comprises the following steps: 1. A plurality of horizontal wells (10) are formed in the coal seam (30) through the horizontal well craft, which comprise injection wells (11) and harvesting wells (12) alternatively arranged at intervals ; 2. A high-pressure injecting equipment is used to inject the mixed gas into the coal seam (30) with coal seam gas via injection wells (11); 3. The mixed gas with coal seam gas is acquired in harvesting wells (12) until the methane concentration is lower than the coal mining concentration and the preservation concentration. The invention has the advantages of considering both the competitive absorption of strong replacement gas and the effect of permeation increase and methane gas partial pressure of feeble replacement gas; improving the recovery factor and the single yield of the coal seam gas, and reducing the coal mining cost of the coal seam gas, simultaneously, mothballing the waste gas geologically, and reducing and sealing waste gas at a maximum.

The invention relates to an electroosmotic method used for dewatering the soil with large area and high water content and equipment thereof. The operation comprises the following steps of: (1) constant current starting: adopting a constant current output mode, namely the output current is constant and the output voltage is variable; (2) constant voltage holding: when the output voltage reaches a preset value, the output voltage is converted into stable voltage and then output, namely the output voltage is constant and the output current is variable, and the stable working condition is held for long time; (3) strengthening impulse: in the process of holding constant voltage, impulse voltage is superimposed by a certain interval; (4) energization at intervals: energization and power off are carried out alternatively; and (5) polarity convention: according to the change of water yield, the positive polarity and the negative polarity of output voltage of the special electroosmotic device are automatically changed. By improving the operation method to electroosmotic dewatering, the invention solves the defects in the prior art, improves dewatering efficiency and reduces the energy consumption.

The invention discloses a biological response system for multistage sewage treatment as well as a manufacturing method and a sewage treatment method. The biological response system is formed by connecting a multistage precipitation pretreatment unit, a multistage hydrolysis and acidizing treatment unit, an aeration oxygenation treatment unit and a multistage undercurrent wetland treatment unit through pipelines; the multistage undercurrent wetland treatment unit comprises a water inlet wetland pool, two groups of decomposition and percolation wetland pools and a water outlet wetland pool which are sequentially arrayed; and the multistage precipitation pretreatment unit, the multistage hydrolysis and acidizing treatment unit and the aeration oxygenation treatment unit are sequentially arranged on one side of the multistage undercurrent wetland treatment unit in parallel and are connected with one another through pipelines. The biological response system provided by the invention has the advantages of scientific design, reasonable structure, fewer electromechanical devices due to the adoption of an automatic flow mode, low operation cost, low sewage treatment expense, small floor area, obvious sewage treatment effect, convenience for operation and maintenance management, low cost on project capital construction and operation, and capability of carrying out purification treatment all the year round, ; the treated sewage can be directly discharged into reservoirs, rivers and lakes and is in accordance with discharge standards in China; and a bioecological technology has stronger self-regulation capability and repair capability.

The invention discloses a system and a method for exploitation of mixed-gas coal-bed methane exploitation in a drainage roadway in an oil well, and relates to a coal-bed methane exploitation technology. The exploitation method comprises the following procedures: 1.various gases are integrated into a mixed gas; the mixed gas comprises a or a plurality of strongly exchanged gases, which comprises H2S, SO2 and CO2; the mixed gas also comprises a or a plurality of weakly exchanged gases, which comprises N2, H2 and He; 2. the mixed gas is injected into a coal bed (5) through an injection hole (1) with high pressure; 3. gas comprising the coal-bed methane is obtained from an drainage hole (6) with a drainage device, until the methane content is lower than the economic exploitation content and safety content. The invention promotes the exploitation rate and unit output of the coal-bed methane, and produces quite an obvious effect in reducing the greenhouse gas emission. Meanwhile, the invention is provided with the effect of reducing the outstanding risks of gas, and is applicable in the low-penetration exploitable coal-bed methane exploitation field.

The invention discloses a deep strengthening method of dewatering reinforcement combined dynamic consolidation, which comprises the following steps: V1ing: a vertical drainage body is arranged in a strengthened foundation. V2ing, soft soil foundation is done with the dewatering reinforcement. V3ing, after a deep soil body below 8 meter of the ground surface of the strengthened foundation is acted by the dewatering reinforcement, the consolidation degree is above to 75 percent, and then the consolidation construction is done. The invention combines a dewatering reinforcement method and a dynamic consolidation method to be applied to strengthen the deep soil body of the soft soil foundation, particularly the permeability coefficient is not less than 10-6cm / s, and the water content of the soil body before the dynamic consolidation is not higher than a strengthened soft soil foundation which is 20 percent of the best water content. The foundation reinforcement effect is obvious, the construction period is capable of being reduced 1 / 3-2 / 3 as a whole, the construction cost is greatly reduced, the cost is saved (compared with a vacuum preloading method, the treatment cost in each square meter is reduced by 30-50 percent ), because the operating intensity is small, the demand for equipment is not high, and the deep strengthening method is suitable for popularization and application.

The invention relates to a method for treating a foundation in a swelling soil area using a geotextile bag. The method comprises the following steps: the swelling soil excavated at an engineering site is directly put into the geotextile bag of which the material and size are strictly controlled, and then the geotextile bag is stacked at the engineering site according to a certain arrangement mode, and the geotextile bag filled with the swelling soil is compacted by layers through adopting rolling equipment to form the foundation of a building. The functional principle of the method is as follows: in the process of uploading pressure and soaking expansion operation, the perimeter of the geotextile bag is elongated, thereby a tension is generated in the geotextile bag; on one hand the tension restricts the swelling deformation of the swelling soil, on the other hand the tension is equivalent to an added cohesion generated in the swelling soil, thereby the overall strength of the swelling soil packed in bag is improved. Treating the swelling soil foundation by the geotextile bag is green and environmental protecting, and the construction is simple, and the benefit is significant.

The invention provides a biochar grassed slope structure for a coastal reclamation district channel. The biochar grassed slope structure is composed of a turf protection layer, a biochar soil recovery layer, a straw water guide layer and a crushed stone water draining body from top to bottom. The turf protection layer is fixed through cross-shaped wooden piles. The biochar soil recovery layer is formed by mixing biochar, flue gas desulfurization gypsum and local topsoil, and a good substrate is provided for the growth of turf. The straw water guide layer is manufactured by crushed straw with different lengths, and the lengths of the straw are gradually reduced from top to bottom according to the structure of an inverted filter layer. The crushed stone water draining body is arranged at a slope bottom, residual water collected in the straw water guide layer is removed timely. On one hand, the good carbon collecting function of the biochar can be utilized, the soil salinity and alkalinity of a reclamation district is improved, and sufficient nutrition is provided for the growth of the turf, and a slope surface is protected better by the turf. On the other hand, the water guide layer made of the straw prevents salt from accumulating in deep soil, seepage deformation is avoided through the structure of the inverter filter layer, a side slope is protected, and the overall structural performance and stability of the side slope are effectively enhanced.

The invention relates to a process for treating excess sludge by utilizing fly ash. The method specifically comprises the following steps of: 1, feeding excess sludge to be treated which has the water content of between 80 and 90 percent, and fly ash in an amount which is 20 to 50 percent based on the mass of the excess sludge into a mixing agitator; fully mixing and reacting for 5 to 15min; feeding into a plate and frame dehydrator for dehydration to obtain sludge of which the water content is reduced to be between 35 and 45 percent; crushing the sludge into coarse particles with the particle size of between 3 and 5mm by using a sludge granulation device; feeding the sludge particles into a solar drying room, and drying for 24 to 48h at the temperature of above 40 DEG C and under the humidity of below 15 percent to ensure that the water content of the sludge is reduced to between 8 and 15 percent; and treating by sludge pulverization equipment and a high-speed airflow collision technology, wherein the particle size of sludge powder is 150 to 300 meshes and the water content is 5 to 10 percent after the treatment. The method has the advantages that: interstitial water, adsorbed water and capillary bound water in the excess sludge are absorbed into the fly ash; due to the characteristic of high permeability coefficient of the fly ash, the water in the fly ash is easily discharged; and the secondary pollution to the environment is avoided by appropriately treating the excess sludge.

The present invention relates to a construction method of bentonite waterproof blankets. The method comprises the steps of processing a base plane, paving waterproof blankets, processing lapped seams, protecting and connecting swing ends, folding ends, processing empty bumps, etc. The waterproof blankets are naturally lapped during the lapped seam processing, the lapped width is not smaller than 100mm, and the lapped seams can not be arranged in corners. The allowed length of the swing ends of the waterproof blankets is 200mm to 400mm longer than the allowed length of reinforcing steel bars, and is from 500mm to 800mm. The ends are lined and sealed by edgings. Facade swing ends and plane swing ends are temporarily protected. The swing ends are folded, sealed and fixed when the waterproof blankets are paved to the facade top. The construction method has the advantages of reasonable technique, permanent waterproofing, simple method, labour and material saving, long service life, long structure, secondary waterproof properties, capability of forming active water-proof system, low construction cost, high efficiency and broad application range. The present invention is suitable for various water-proof requirements of underground waterproof engineering.

The invention belongs to the field of metallurgical mines, and particularly relates to a water-saving tailing discharge method. A place is selected according to the tailing pond address selection principle. A tailing pond, a primary dam, a floodwater drainage system, a seepage drainage system, a tailing conveying system, a tailing classification and condensation system, a water return system and other matched facilities are reasonably arranged according to terrain and geological conditions. The tailing conveying system comprises a section from a dressing plant to a hydrocyclone, a section from the hydrocyclone to a thickener, and a section form the underflow of the thickener to the tailing pond. Pumping or self-flowing conveying can be adopted for the conveying process of each section. The tailing classification and concentration involves the steps that ore pulp coming from the dressing plant is classified through the hydrocyclone; and overflow tailing ore pulp of the hydrocyclone is concentrated through the thickener. The water return system comprises a thickener overflow water return system and a tailing pond water return system. Return water can be conveyed to the mineral processing process to be recycled in a pumping or self-flowing conveying manner. The tailing pond formed through the method is good in anti-seismic property, high in return water utilization rate, low in dam body seepage line, large in anti-slide buckling safety factor, wide in application range and low in operation and management expense.

The invention relates to a tunnel lining waterproof joint. The tunnel lining waterproof joint comprises a primary lining layer, a waterproof layer, a deformation layer and a secondary lining layer which are sequentially distributed from outside to inside along the section of a tunnel. A flexible joint body is arranged in the annular direction of the tunnel and divides the deformation layer and the secondary lining layer into two adjacent parts in the longitudinal direction of the tunnel. The section of the flexible joint body is in a T shape. The first width of the portion, located in the deformation layer, of the flexible joint body is larger than the second width of the portion, located in the secondary lining layer, of the flexible joint body. The flexible joint body is filled with plastic concrete material. The plastic concrete material is prepared from, by weight, 10-20 parts of cement, 70-80 parts of sand, 20-30 parts of water, 70-90 parts of stone, 2-4 parts of additive, 2-4 parts of bentonite and 6-9 parts of clay. Plastic concrete is adopted as the filling material of a T-shaped deformation joint, the seepage path of seepage water can be prolonged, anti-seepage performance is improved, and the breakage probability of a boundary is reduced.

A manufacturing device for a rotor core includes: a magnetization device that magnetizes magnet raw materials before being magnetized disposed in magnet insertion holes of the rotor core to turn the magnet raw materials before being magnetized into permanent magnets; and a detachment device that detaches the rotor core from the magnetization device. The detachment device also functions as a mounting device that mounts a jig around the rotor core when the rotor core is detached from the magnetization device.

The invention discloses a method for preparing regenerated pervious concrete, and belongs to the technical field of building material preparation. The method comprises the following steps: taking waste concrete blocks as a raw material, performing crushing, removing foreign matters, and grinding to obtain recycled aggregate; preparing a solution from lauryl sodium sulfate, sodium gluconate and the like, mixing with the recycled aggregate, filtering, drying filter dregs in air, preparing intensified recycled aggregate, mixing and grinding waste oyster shells, coal ash, silica ash and the like to obtain a mixed powder material, finally stirring the prepared mixed powder material, the intensified recycled aggregate, ordinary Portland cement and the like, further adding a polycarboxylate superplasticizer and deionized water, mixing, and discharging, thereby obtaining the regenerated pervious concrete. On premise that the porosity and the pervious coefficient of the regenerated pervious concrete are remarkably higher than those of common previous concrete, the compression strength of the regenerated pervious concrete is still higher than that of the common previous concrete, good corrosion properties are achieved, and thus the service life of a previous concrete pavement is remarkably prolonged.

The invention discloses a construction method for a drainage cement mixing pile. According to the principle that the permeation coefficient of high liquid limit clay can be increased by doping low-dosage cement or other modifiers (such as lime) into the high liquid limit clay, the stirring diameter is adjusted by changing the rotating direction of a blade in combination with a novel nail-shaped cement bidirectional stirring pile machine tool emerging currently, and low-dosage (the dosing ratio is generally less than 5 percent) cement or other modifiers (such as lime) which can be used for increasing the clay permeation coefficient is sunk and sprayed for the first time to form a large-diameter drainage body. In a rising process, high-dosage (the dosing ratio is generally not less than 5 percent) cement or other curing agents which can be used for enhancing the strength of a soil body is sprayed in a rising process, and reverse rotation is performed to form a small-diameter central pile body. The large-diameter pile body is mainly used for increasing the permeation coefficient of the soil body and releasing water pressure from apertures. The small-diameter pile body is mainly used for enhancing the foundation bearing capacity. The problems of slow release of water pressure from the apertures of the soil body and low strength in a high liquid limit clay area, and complex process and high manufacturing cost in other foundation treatment methods are solved.

The invention relates to the field of garbage treatment, in particular to a final covering layer for household refuse semi-aerobic landfill. The final covering layer covers the surface layer of a household refuse semi-aerobic landfill and comprises a vegetation layer, a biological covering layer, a reservoir layer, a capillary barrier layer and a drainage layer sequentially from top to bottom. Methane-oxidizing bacteria exist in the biological covering layer. According to the actual situation of the household refuse semi-aerobic landfill process, the covering layer provided by the invention has good air permeability, and it can be guaranteed that external air is diffused into a landfill pile body; and meanwhile, the landfill gases including methane and the like generated when pile body landfill is conducted are diffused outside the pile body from the inside, so that an appropriate oxidation removing environment is provided for the methane released into the air through the covering layer. By adoption of the final covering layer for household refuse semi-aerobic landfill, the methane oxidation efficiency of the final covering layer is improved through optimization design of all the layers.

The present invention provides a crack evolution test method of a floor strata solid-fluid coupling material, wherein the problem that the similar solid-fluid coupling simulation can not be really achieved is solved with the present invention. The crack evolution test method comprises: 1, weighing sand, paraffin, hydraulic oil, asphalt, calcium carbonate and vaseline according to a certain ratio; 2, carrying out heating melting on the paraffin, the hydraulic oil, the asphalt and the vaseline, and uniformly stirring; 3, adding the sand and the calcium carbonate, and co-stirring; 4, carrying out tamping molding and demolding standing on the materials; 5, carrying out a mechanical property test and recording character features; 6, selecting the proximate ratio of the suitable materials; 7, repeatedly performing the steps 1-3 to complete the simulation floor; 8, placing the simulation floor in a floor rupture simulation test device; and 9, applying a water pressure, and observing and recording the damage law and the crack evolution features of the simulation floor. According to the present invention, with the developed material, the physical and mechanical properties of the similar material of the model test can be well maintained, the two conditions such as solid deformation and similar permeability can be met, and the good effect can be achieved in the crack evolution test.

The invention relates to a preparation method and application of a mixed matrix membrane with a thermoplastic elastomer as the matrix. An unconventional solvent (acid) is employed to prepare a casting solution, and casting is carried out to prepare the mixed matrix membrane. When the molecular sieve content reaches certain degree, a layered structure similar to a composite membrane is formed, under the circumstance of substantial increase of the permeation flux, the selectivity remains unchanged, and the compromise relationship between traditional permeability / selectivity can be overcome. The method has a simple process and is convenient, and the obtained membrane can be used for gas separation, especially CO2 / light gas (N2, CH4, H2, O2) separation.

The invention relates to a multilayer wall rock grouting stereosphere tunnel bearing structure and constructing method. It has tunnel and the feature is that two layers or over two layers different consolidation holes density, different grouting pressure, different serum species, and different particle of serum would be coated on the wall rock. The invention could be used in water conservancy water and electricity tunneling under the action of super-high pressure cranny groundwater, and could be also used in traffic tunneling and city water supplying tunneling.

The invention mainly relates to a technology for purifying certain heavy metal pollutants in sewage and removing phosphorus by mixed constructed wetland substrates. According to the invention, raw material preparation components, structures, volumes and mass ratio of the constructed wetland substrates are determined, removing effects of wastewater pollutants in different preparation modes are tested and analyzed, and an optimized preparation method is provided. The invention has a guiding significance for the construction and operation of the constructed wetland for treating the wastewater containing heavy metals and wastewater containing phosphorus.

The invention discloses a polyimide / surface-modified metal organic framework mixed matrix membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: dopamine surface modification is adopted, so that MOF particle agglomeration can be effectively prevented, and the particle size is reduced; meanwhile, the compatibility between an MOF material and a polyimide polymer matrix is improved, and non-selective gaps appearing on a polymer / MOF phase interface are reduced; CO2 / N2 mixed gas and CO2 / CH4 mixed gas permeability separation performance results of the polyimide / surface-modified MOF mixed matrix membrane show that the CO2 permeability coefficient and CO2 / inert gas selectivity of the membrane material can be simultaneously improved by surface modified MOF doping; and the CO2 / N2 mixed gas and CO2 / CH4 mixed gas permeability separation performances both exceed the Robeson upper limit in 2008, the CO2 separation performance of the membrane can be effectively enhanced by preparing the polyimide / surface modified MOF mixed matrix membrane, and the membrane can be applied to the fields of capture of CO2 in flue gas and purification of natural gas.

The invention discloses a system and a method for exploitation of mixed-gas coal-bed methane exploitation in a horizontal hole in an oil well, and relates to a coal-bed methane exploitation technology. The exploitation method comprises the following procedures: 1. various gases are integrated into a mixed gas; the mixed gas comprises a or a plurality of strongly exchanged gases, which comprises H2S, SO2 and CO2; the mixed gas also comprises a or a plurality of weakly exchanged gases, which comprises N2, H2 and He; 2. the mixed gas is injected into a coal bed (3) through an injection hole (1) with high pressure; 3. gas comprising the coal-bed methane is obtained from an drainage hole (2) with a drainage device, until the methane content is lower than the economic exploitation content and safety content. The invention promotes the exploitation rate and unit output of the coal-bed methane, and produces quite an obvious effect in reducing the greenhouse gas emission. Meanwhile, the invention is provided with the effect of reducing the outstanding risks of gas, and is applicable in the low-penetration exploitable coal-bed methane exploitation field.

The invention discloses equipment for extracting helium from BOG gas with high hydrogen content and a process thereof, and relates to the field of equipment and process for extracting helium from BOGgas. The equipment comprises a catalytic dehydrogenation reactor, a cooler, a molecular sieve dryer, a feed gas compressor, a heat exchanger, a membrane separator, a vacuum pump, a buffer tank, a crude helium compressor, a helium purifier, a helium supercharger, a digital display type gas supply busbar device and a helium bottle; according to the invention, the permeability coefficient of gas molecules is increased in a manner of before- membrane pressurization and after- membrane vacuumizing; relatively high yield and purity of helium are achieved by using a relatively small membrane area; ina membrane separation process for extracting concentrated crude helium from BOG feed gas, Non-phase change is realized, and the equipment investment and the operation cost are reduced; the recovery rate of helium is increased before desorbed gas of the helium purifier returns to the feed gas compressor, and the helium yield of the whole device is as high as 99%; an interface is additionally arranged on an original BOG fuel gas pipeline to concentrate helium in BOG feed gas, and the loss of impermeable gas passing through a membrane separator is lower than 5%.

The invention relates to an in-situ enhanced biological ventilation remediation method for a petroleum hydrocarbon contaminated site. The problems that in the prior art, the remediation efficiency islow, the remediation effect is poor, the remediation cost is high, and the application range of an in-situ remediation technology is limited are mainly solved. By the in-situ enhanced biological ventilation remediation method for a petroleum hydrocarbon contaminated site, firstly, a soil layer crack and a sand layer are formed in a soil layer around an injection hoistway of a petroleum hydrocarboncontaminated site by utilizing a hydraulic fracturing technology to increase the permeability coefficient of the contaminated site, further, air or oxygen, a nutrient solution and an exogenous efficient degrading bacterium agent are supplied into the soil and the underground water, and by means of aerobic activity of microorganisms, pollutant degradation is promoted; meanwhile, volatile organic compounds and degradation products are promoted to flow to a gas extraction well through the pressure gradient in soil. The above problems are well solved through the technical scheme of extraction andremoval, and the method can be used for petroleum hydrocarbon contaminated site remediation.

The invention discloses a portable permeability coefficient testing device of permeable concrete pavement and a testing method of the device, and belongs to the field of penetrating quality testing ofporous materials. The portable permeability coefficient testing device of the permeable concrete pavement utilizes a servo motor driving an injection piston cylinder to carry out water injection to simulate penetration process, penetration flow at a certain time can be converted according to a water injection rotating speed of the servo motor, and permeability pressure is detected by using a pressure sensor. According to the portable permeability coefficient testing device of the permeable concrete pavement and the testing method of the device, various data acquisition is more accurate and convenient in the testing process of permeability coefficients, and the testing precision of the permeability coefficients is improved; the rotating speed of the servo motor is controlled by a controller, and the effluent pressure of the injection piston cylinder can be controlled to meet the penetration test requirements of samples with different blockage degrees; and a large-size overflow cylinderis not needed by the testing device, the structure is simple, the size is small, and the testing device is convenient to carry and can realize a site test of the permeable concrete pavement.

The invention relates to a harbor construction sea reclaimed material utilizing silt, which is prepared by mixing gangue sand, the silt and cement. Water content of the silt is 60%-100%, and the weight ratio of the silt, the gangue sand and the cement is 1: 3-5: 0.04-0.06. A preparation method of the harbor construction sea reclaimed material utilizing silt is further disclosed. The material and the method achieve waste object utilization of the gangue sand and the silt. The material is high in strength, low in construction cost and capable of achieving quick solidification of silt and saving a large amount of natural resources. The material can be applied to projects such as sand quilt blowing filling, filtering guide layers, sand cushion layers and land area backfilling.

The invention discloses a salty water-fresh water replacing and leaching desalting device for a coupled phreatic aquifer. The device comprises a field desalting assembly, a saline water treatment assembly and a rainwater collection wetland. The field desalting assembly comprises a plurality of desalting units, a water inlet component and a drainage component, and each desalting unit comprises a desalting unit contour, a water inlet branch part and a partition plates; the saline water treatment assembly comprises a sedimentation tank, an overflow weir, an ecological corridor and a filter pipe;and the rainwater collection wetland comprises a water-impermeable layer, a water collecting tank, a water distribution well, a perforated communicating pipe and a water storage porous medium. According to the invention, underground water of saline-alkali soil is changed, and the underground water is gradually desalted through a plurality of cycles; and on the other hand, a mode of rotation irrigation of brackish water and rainwater is adopted, so that precious fresh water resources in coastal regions are saved, collected rainwater is fully utilized to be added into the cycle of the underground phreatic aquifer, and therefore, the problem of desalination of coastal saline-alkali soil is fundamentally solved.

The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device and a sewage treatment method for a self-cleaning type micro-aeration vertical baffled wetland. The invention discloses the sewage treatment device for the self-cleaning type micro-aeration vertical baffled wetland. The sewage treatment device consists of a water distribution region, a tank body and a water collecting region; to-be-treated sewage flows into the water distribution region through a water inlet tube, and then flows from the distribution region into the tank body by taking an overflow; outlet water treated by the tank body flows into the water collecting region by taking an overflow; and the tank body is formed by connecting a plurality of stages of vertical baffled wetlands with different treatment functions in series, in a water flow direction, namely an anaerobic wetland, a carbon oxidization wetland and a short-cut nitrification-denitrification wetland. The invention further provides a sewage treatment method by adopting the device. According to the device provided by the invention, the tank body is divided into an anaerobic section, an aerobic section and a micro-aerobic section in the water flow direction, and efficient removal of carbon pollutants and nitrogen pollutants can be realized; and the problems that a conventional constructed wetland is too low in dissolved oxygen, relatively great in land area, easy to block by stuffing and difficult to clean after being blocked are solved.

The invention discloses equipment and process for purifying helium from BOG gas. The invention relates to the field of BOG gas helium purification. The equipment comprises a primary catalytic dehydrogenation reactor, a cooler, a molecular sieve dryer, a feed gas compressor, a heat exchanger, a membrane separator and a vacuum pump, hydrogen in the helium purification process is reduced by adoptinga three-stage catalytic dehydrogenation reaction, the physical properties of hydrogen and helium are very close, therefore, the hydrogen in the pure helium cannot be removed by using a pressure swingadsorption or cryogenic process, multi-stage catalytic dehydrogenation ensures the purity of helium, a membrane separation process is adopted, BOG gas of the raw materials is concentrated by 30 times,the treatment capacity of the subsequent helium purification process is reduced, the permeability coefficient of gas molecules is increased by adopting a mode of pressurizing before the membrane andvacuumizing after the membrane, helium reaches higher yield and purity by using a smaller membrane area, the recovery rate of helium is increased by returning the desorbed gas of the helium purifier to the front of the feed gas compressor, and the helium yield of the whole device is as high as 99%.