293results about How to "Relieve blockage" patented technology

The invention relates to a low temperature SCR denitration catalyst taking an organic metal framework as a carrier and a preparation method thereof, belonging to fields of an air pollution regulation technology and an environmental protection catalytic material. The preparation method comprises the following steps: loading oxides of one or more metal elements of Mn, Fe, Cu, V and Ce on an MOFs catalyst carrier to serve as effective components by an immersion method; and obtaining the catalyst by drying, calcinating and sieving, wherein in terms of the total mass of the catalyst, the content of the loaded active metal oxides is 1-20% by mass and the working temperature of the catalyst is 80-200 DEG C. The catalyst has larger specific area surface, higher low temperature catalytic activity, good denitration effect and wide industrial application prospect in the flue gas denitration process.

The invention relates to a fish streaming based non-signal intersection vehicle-vehicle cooperation control system and belongs to the field of vehicle control. A sensing positioning module of the system comprises an environment sensing portion and a navigation positioning portion and specifically comprises a DGPS positioning device, an inertial navigation system, a radar device and a sensor. A motion control module comprises a motion controller, a driver, an actuator, a transmission part and a controlled part. A wireless communication module consists of a transmitting-receiving device. A human-computer interaction interface comprises a processor, a display unit, an input unit, a communication interface and a data storage unit. A power management and control module comprises a storage battery and a level conversion unit. A route planning module adopts global route planning and is provided with an electronic map. A decision control module comprises a central processing unit, an information processing unit and a storage unit. Compared with the prior art, the fish streaming based non-signal intersection vehicle-vehicle cooperation control system has the advantages of being used for an unmanned vehicle, being provided with a wireless communication module and being high in active safety and road utilization rate.

The invention discloses a device and a method for preparing polysulfonamide nanometer fiber nets by means of airflow-electrostatic combination. The device comprises a liquid storage tank, an air chamber, an electrostatic generator and a receiving device, a plurality of spinnerets are arranged at the bottom of the liquid storage tank, the air chamber is arranged outside the liquid storage tank, air outlets in the number equal to that of the spinnerets at the bottom of the liquid storage tank are arranged at the bottom of the air chamber, the spinnerets are arranged inside the air outlets, an electrode with multiple pins are led from the positive electrode of the electrostatic generator to be connected with the spinnerets, and a lead is led from the negative electrode of the electrostatic generator to be connected with the receiving device. The method includes steps of combining the airflow method and the electrostatic spinning method effectively to prepare the polysulfonamide nanometer fiber nets. By the device and the method for preparing the polysulfonamide nanometer fiber nets, the specific surface area of the polysulfonamide nanometer fibers is enlarged greatly, the problem of blockage of existing electrostatic spinning needles due to inflow of the airflow is alleviated greatly, and spinning efficiency is improved. Besides, nanometer fibers can be prepared at the normal temperature directly, so that production procedures are simplified and production cost is saved.

The present invention relates to a deep denitrification process and device for domestic sewage without additional carbon source. The present invention is a combination process composed of anaerobic acidification tank, micro-aeration vertical underflow wetland and horizontal underflow wetland. The specific process is as follows: The domestic sewage enters the anaerobic acidification tank; the effluent from the anaerobic tank enters the micro-aeration vertical subsurface flow wetland; the treated sewage from the micro-aeration vertical subsurface flow wetland enters the horizontal subsurface flow constructed wetland. The effluent from horizontal subsurface flow wetlands can be used to supplement static landscape water bodies and other purposes. The present invention controls the ratio of NH4+-N / NO3--N in the horizontal subsurface flow wetland influent to 1-1.4:1 through the adjustment of appropriate process parameters, and the actual BOD5 / N is far lower than the theoretical value of denitrification BOD5 / N Under these conditions, anaerobic ammonium oxidation can be stably realized in constructed wetlands, forming a low-cost, high-removal sewage deep denitrification process. Micro-aeration vertical flow wetlands + horizontal subsurface flow wetlands can be applied to sewage treatment plants. Advanced water treatment can also be used for decentralized domestic sewage treatment. The invention has the advantages of simple structure, low cost and convenient operation and maintenance, and can achieve a TN removal rate of over 95%, stable pollutant removal effect, and effluent water quality up to Class IV standard of surface water.

The invention discloses a denitration operation optimization method for an SCR (Selective Catalytic Reduction) system of a tangential firing pulverized coal boiler. The denitration operation optimization method comprises the special steps of using a numerical simulation method; obtaining a velocity of flue gas, an NOx concentration distribution uniformity and a deviation of an outlet of the boiler by means of considering the structure and the operation condition of the boiler as a boundary condition of an inlet of the SCR system; obtaining the velocity of the flue gas, an NH3 / NOx distribution uniformity and a deviation inside the SCR reactor; optimizing and adjusting an ammonia spraying flow of an ammonia spraying nozzle on a flue of the SCR system according to the velocity of the flue gas and the NH3 / NOx; increasing the ammonia spraying flow of the ammonia spraying nozzle corresponding to an area with the larger velocity of the flue gas, and decreasing the ammonia spraying flow of the ammonia spraying nozzle corresponding to an area with the smaller velocity of the flue gas; and increasing the ammonia spraying flow of the ammonia spraying nozzle corresponding to an area with the smaller NH3 / NOx, and decreasing the ammonia spraying flow of the ammonia spraying nozzle corresponding to an area with the larger NH3 / NOx. The denitration operation optimization method provided by the invention can be used for optimizing and adjusting by comprehensively considering the structures and the operation conditions of the boiler and the SCR system, so that the denitration efficiency of the SCR system is improved; the spraying amount and the release rate of ammonia can be reduced; the security, the economical efficiency and the environmental friendliness of the operation of the boiler unit can be improved.

The method treats city traffic signal control system as traffic network as each crossing is an agent which has function of information self-collecting and self-processing. The system can realize dynamic decision for traffic signal control at each crossing by relying on network self-organization. The attribute matrix is used to express state information for local and adjacent crossing with using relative bearing for connected crossing. The system is established to be virtual network model with cellular automara features so the self-organized control for traffic signal can be realized by carrying on dynamic migration of crossing signal state under control rule driving.

The invention relates to a modified attapulgite supported catalyst for oxidation of elemental mercury and a preparation method thereof, and belongs to the field of atmospheric pollution treatment technologies and environmental protection catalytic materials. The preparation method comprises the following steps of: preparing a modified attapulgite of a transition metal selected from Fe, Zn, Cu, Mn and Ce through an ion exchange method and using the attapulgite as a catalyst carrier; adding a certain amount of an active oxide component of one or more metal elements selected from Fe, Zn, Cu, Mn, Ce, W, Co, Ag, Au, Pd and V by the adoption of a sol-gel method; drying, calcining, and sieving to prepare the catalyst. Based on the total mass of the catalyst as the reference, the content of the loaded active metal oxide is 10-30 wt%. The catalyst has characteristics of high activity and low-temperature adaptability, and has a wide application prospect in the field of mercury cleaning in flue gas.

A traffic accident site rapid mapping system based on image guiding comprises a homography matrix solution module, a space coordinate transformation module, a re-sampling module, a mapping and marking module and a file preserving and printing module. The homography matrix solution module builds a mapping relationship between a traffic accident site picture image plane and an actual road plane according to the two-dimensional direct linear transformation method, the space coordinate transformation module restores the position information of a traffic site picture in object space according to the homography matrix and scales the range of the traffic accident site to the size range of the original traffic accident site picture, the re-sampling module restores gray information of the traffic accident site picture in object space and achieves transformation from a perspective picture to an orthographic projection picture of the traffic accident site picture, the mapping and marking module achieves direct mapping and relevant size marking of the traffic accident site information on the orthographic projection picture, and the file preserving and printing module achieves functions of preservation and site printout of the traffic accident site picture. By means of the traffic accident site rapid mapping system, the accuracy of traffic accident site survey is improved, the on-site data processing and mapping time is saved, and the requirement of site picture printout on the traffic accident site is further satisfied.

A membrane separation device wherein the occurrence of membrane clogging is minimized to reduce a load in a filtering operation. A membrane module (3) is configured by providing separation membranes (4) in a housing (6), which has openings in the upper and lower portions thereof, in such a manner that the separation membranes (4) are upright and are parallel to each other. A water flow guide (5) is provided to the membrane module (3) in the flow path thereof through which water to be treated flows, and the water flow guide (5) is provided so that the area (S2) of the opening of the flow path out of which treated water flows is less than the area (S1) of the opening of the flow path into which the water to be treated flows. Such membrane modules (3) are stacked on each other in the direction of the height of the housing (6) to configure a membrane unit (2). A membrane separation unit (1) is configured by providing an air diffuser (7) below the membrane unit (2).

The invention relates to a vehicle dynamic display device and a displaying method thereof. The vehicle dynamic display device comprises an MEMS microaccelerometer, a vehicle state discriminator, a driver, a LED display or an EL emitting diode. An accelerometer is adopted for detecting state; an automatic decision can be performed on states of collision, emergency brake, urgency speed reduction, general speed reduction and acceleration through the vehicle state discriminator; real-time display can be respectively performed according to the urgent degree ordering in various colors, graphics, characters or the combination thereof; hand operation is replaced by automatic control, and the two signals of Preparation-Break replace break signals, so that the difficulty of Emergency Brake Precaution is solved. Once a vehicle is in danger, all vehicles thereafter can synchronously put on the brakes as well as the front vehicle, and an early warning time of 0.8 second to 1 second can be gained, thereby effectively avoiding the phenomena of driving too close to the car in front and serially driving too close to the car in front. The comprehensive early warning mechanism overcomes a plurality of defects in the traditional signal lamp and creates the beginning of mutual communication among vehicles, knowing one and others and safe driving. The invention has the advantages of low cost, high cost performance and simple installation, and is suitable for high-level installation at the tail parts of various vehicles and the installation of rear boxes of motorcycles and mopeds.

The invention discloses a denitrification operation optimization method of a SCR (selective catalytic reduction) system of a W flame boiler. The denitrification operation optimization method particularly comprises the following steps: acquiring the smoke flow speed and the NOx concentration distribution uniformity and deviation at an outlet of a boiler by considering the structure and the running working condition of a W flame boiler so as to act as inlet boundary conditions of a rear-stage SCR system; adjusting the ammonia spraying flow rate corresponding to the region at which the flue flow speed is slightly high and the NH3 / NOx is slightly low to be low, increasing the number of ammonia spraying nozzles, and adjusting the ammonia spraying flow rate corresponding to a region at which the flue flow speed is slightly slow and the NH3 / NOx is slightly high to be low when the standard criterion that the ammonia spraying flow rate at the upper layer is higher than that at the lower layer, and the ammonia spraying flow rate at the middle is higher than that at two sides is met. According to the invention, the structures and the running situation of the boiler and the SCR system are optimized and adjusted, the denitrification efficiency of the SCR system is improved; the spraying-in quantity and the escape rate of ammonia are reduced.

The invention discloses a process and a system for treating ethylene tar. According to the process, preheated ethylene tar contacts a coking reaction effluent from a delayed coking reaction system ina pretreatment reactor, and a light component and a heavy component are obtained after separation; the heavy component enters the delayed coking reaction system, and the generated coking reaction effluent enters the pretreatment reactor; the light component and hydrogen enter a hydrogenation reaction system, and the reaction effluent is separated to obtain gas, gasoline distillate, diesel oil distillate and heavy oil distillate; and the heavy oil distillate enters a catalytic cracking reaction system, and the catalytic diesel oil obtained after separation enters the pretreatment reaction. Thetreatment system comprises the pretreatment reactor, the coking reaction system, the hydrogenation reaction system, and the catalytic cracking reaction system. With the process and the system of the present invention, the stable long-cycle operation of the whole treatment system can be ensured, and the yield of the light oil product is high.

The invention discloses a big data application platform based on the Internet and an intelligent traffic video monitoring management system. The system comprises an application layer, a basic serviceand an equipment layer, the application layer is composed of a motor vehicle anti-smuggling deploying and controlling system and an intelligent traffic management and control command platform, the basic service is composed of the fake-licensed vehicle detection, the interval speed measurement, the comparison alarm, a traffic management information base and a traffic management geographic information system, and the equipment layer is composed of the mobile speed measurement, a vehicle-mounted platform, an electronic police, the interval vehicle speed, the fixed speed measurement, the traffic time detection, the video monitoring and a bayonet system. According to the invention, the on-site images in a monitoring area are sent back to the command center through the system, the signal timingis adjusted in time, or traffic is dredged and the traffic flow distribution is changed through other means, so that the purpose of relieving traffic jam is achieved. The dynamic and static traffic safety information of various highway networks is collected and processed, and the traffic safety situations and accident hidden dangers are analyzed, researched and judged, so that the functions of interconnection and intercommunication of traffic violation information, source supervision and the like are achieved.

The invention discloses a sewage aerobic land treatment system. The system comprises a groove body formed by digging under the ground, wherein impermeable membranes are laid at the periphery and at the bottom of the groove body; and a sand layer, a water distribution layer, a packing and water collecting layer and a soil layer are formed in turn from bottom to top. The sewage aerobic land treatment system is characterized by also comprising a blast aeration system consisting of a blast blower, an air diffusion device and a connecting pipeline, wherein the air diffusion device is positioned below the water surface of the land treatment system and connected with the blast blower through a pipeline; pretreated sewage enters the land treatment system; and air is pressurized by the blast blower and diffused into sewage of the system in the form of small air bubbles through the air diffusion device. Therefore, the aims of charging oxygen into the sewage and stirring are fulfilled, good reoxygenation effect, high mass transfer efficiency, quick bio-membrane updating and high treatment efficiency are achieved, and the problem of blockage of the land treatment system in the operating process is solved effectively.

The invention discloses a straw smashing process which comprises the following steps: (1) pretreatment; and (2) smashing treatment. The smashing quality problem, the smashing continuous operation problem and the problem of high smashing cutter cost are solved mainly. The smashing quality problem refers to low fermentation efficiency caused by a too large smashing size (the length and the diameter), high screening difficulty after fermentation, low efficiency, high proportion of disqualified straw screened out and waste caused by secondary repeated smashing fermentation. The smashing continuous operation problem refers to regular production pause caused by the four reasons which are plastic product winding, stone block impact, short service lives of cutters, silting resulting from too high water content of soil and straw, and motor overheating. The problem of high smashing cutter cost refers to high cost caused by a too large cutter use amount resulting from short service lives of the cutters.

The invention relates to an agricultural organic waste anaerobic fermentation recovery biogas reaction apparatus and a recovery method thereof. The apparatus comprises an acidogenic fermentation phase reactor and a methanogenic phase reactor, a filtering device exists between the acidogenic fermentation phase reactor and the methanogenic phase reactor, wherein the acidogenic fermentation phase reactor adopts a continuous stirred tank reactor, the methanogenic phase reactor adopts an anaerobic expanded granular sludge bed reactor with the ratio of height to diameter of 9:1-10:1, a filtering material made of a nylon filter screen or a polyethylene filter screen is arranged in the filtering device, the aperture size of the filter screen is 0.5-3mm, and a total volume ratio of the acidogenic fermentation phase reactor to the filtering device to the methanogenic phase reactor is 2.5-3.5:1:1. The apparatus and the method can improve the degradation efficiency of agricultural organic wastes in an anaerobic fermentation system, alleviate the bottlenecks of the obstruction technology of equipment and pipelines, reduce the fluctuation interference of northern low temperature environment to the whole anaerobic fermentation system, and improve the running stability and the biogas generation rate of the system.

The invention discloses a biological treatment process technology for an MBR (Meane Biological Reactor) membrane of engineering bacteria fed by using activated carbon as a carrier, which belongs to the technical field of sewage treatment, and has the process that a sloping plate sedimentation tank and a sand filter are prepositioned, thoroughly removing particulate matters in inflow water, the length-width ratio of an aeration tank is 3:1, the depth of the tank is 5-6m, an MBR membrane component is placed on the tail end of the aeration tank, an aerating system comprises a plurality of groups of liftable micropore aerator pipes, overhauling and replacement can be carried out at any time without affecting operation of the system when failures occur, the activated carbon adopts 300-mesh powdered carbon, the feeding amount reaches 30-40 percent under the condition of normal water level SV 30, the MBR membrane component adopts a high-quality microfiltration membrane with the hole diameter being 0.1 mum, spoil disposal is not carried out when the system is in operation, aged sludge can be removed through aerobic digestion, and the MBR membrane process adopts a parallel pump to discharge water. The process technology is simple, is stable to operate, is simple to manage, and has low energy consumption, convenience in maintenance, low manufacturing cost, and easiness in adjustment.

The invention provides a new continuous production stabilization and efficient interactive blockage removal method for the high water later oil reservoirs of an oil field. The method comprises the following steps of (1) backwashing a well for two days, and filling clear water in the wellhole; (2) calculating and preparing a corresponding amount of acid-resistant and oil soluble temporary plugging agent before the well is backwashed completely; (3) squeezing the temporary plugging agent from a sleeve, and replacing the temporary plugging agent by clear water until the temporary plugging agent enters the strata completely; (4) closing the well and waiting on cement for one day; and (5) continuously removing the blockages in an acidizing manner by adopting the conventional blockage removal technology. The problem that the tar productivity of high water oil well is not high by the conventional acidic blockage removal technology is solved; the temporary plugging agent is used for blocking a high-permeability layer; the pollution to a low permeability layer is relieved; the low permeability layer is released; and the high permeability layer is not polluted; the blockage removal is interacted, so that the aim of improving the tar productivity is finally fulfilled, and technical assurance is provided for stabilizing production of high water oil fields.

The invention discloses a comprehensive wastewater reuse treatment method for a waste incineration power plant. The method comprises the steps of production sewage pre-treatment, flue gas wastewater pre-treatment, domestic sewage pre-treatment, landfill leachate pre-treatment, reverse osmosis deep treatment and dehydration treatment. According to the method, landfill leachate and domestic sewage are mixed and subjected to facultative and aerobic treatment, so that COD and NH3-N in the landfill leachate can be effectively reduced, the proportion of pollutants in sewage can be balanced, the mixed liquid has good biodegradability, and the effluent quality is good; the pretreated production wastewater, the biodegraded landfill leachate and domestic sewage are subjected to combined deep treatment, and only one set of treatment device is needed, so that the investment cost is reduced; and sewage combined treatment is adopted, so that the content of COD and heavy metal ions in the sewage which enters a reverse osmosis system can be effectively reduced, the problem of reverse osmosis membrane blockage can be effectively relieved, the frequency of chemical cleaning can be reduced, and the service life of the reverse osmosis membrane can be prolonged.

The invention discloses an urban traffic intelligent monitoring coordination management system based on big data. The system comprises a traffic flow monitoring and analyzing module, an accident analyzing and processing module, a traffic database, a remote server and a traffic light display terminal. According to the invention, the traffic flow monitoring and analyzing module is used for monitoring the traffic flow of the road intersection; the green light passing time of the intersection is dynamically adjusted according to the real-time traffic flow; the accident analyzing and processing module is used for acquiring monitoring images of traffic accidents at the intersection; the traffic light at the intersection is switched to a specified red traffic light for display; the problem that an existing traffic management system is unreasonable is solved, the traffic road management level is improved, urban road congestion is relieved, primary and secondary traffic accidents are further reduced, the traffic experience feeling of traffic users is enhanced, and meanwhile the management efficiency of traffic managers is improved.

The invention provides an urban expressway entrance ramp control method, which comprises the steps of predicting an entrance ramp downstream dynamic critical occupation rate under an uncertain trafficflow state through ESN; and then designing a function used for dividing principal and subordinate ramps, dynamically determining the number of ramps required to be coordinated according to the function, and expanding the coordinated control range, wherein the function dynamically changes along with the time, and influences are imposed on a value of the function by road traffic accidents, weatherand the like, so that a BP neural network is utilized to perform training on the function when the function is design so as to improve the accuracy thereof. According to the algorithm, the ramp regulation rate is designed by taking the entrance ramp downstream dynamic critical occupation rate as a basis, the coordinated control range is dynamically determined according to the designed function soas to adapt to changes in actual traffic flow state of the expressway principal line, defects of the Bottleneck algorithm, the Linked-control algorithm and the Swarm algorithm are overcome, and the congestion duration time and the high density duration time of the urban expressway principal line in traffic flow operation are obviously reduced.

The invention relates to a preparation method of a nuclear pore filter membrane and particularly relates to a nuclear pore filter membrane with a pore passage structure combined by a cone-shaped pore passage and a columnar pore passage. A preparation method of the nuclear pore filter membrane with tthe compound pore passage structure mainly comprises the following steps: radiating a polymer film by virtue of high-energy heavy ions, so as to form a latent trace; respectively etching the same surface of the radiated polymer film by virtue of two etching solutions with different track etching speeds, so as to form the novel cone / column compound pore passage structure. The cone / column compound pore passage structure has the obvious structural characteristics that the pore passage is formed by the linkage of an upper part and a lower part, and specifically comprises the cone-shaped pore passage and the columnar pore passage; the columnar pore passage is etched and machined by virtue of liquid with high track etching speed; the cone-shaped pore passage is etched and machined by virtue of liquid with the lower track etching speed. By utilizing the novel pore passage design, the technical problem of low filtration flux of the small-aperture nuclear pore filter membrane can be beneficially solved, and the technical problems of single-layer filtration and repeated cleaning are further beneficially solved.

The invention provides a micro-hole vortex sleeve mixing reactor and application thereof. The micro-hole vortex sleeve mixing reactor comprises a concentric sleeve consisting of an outer pipe and an inner pipe, wherein an annular channel is formed between the inner pipe and the outer pipe; the outer pipe is provided with a continuous phase inlet and an outlet; one end of the inner pipe is a dispersion phase inlet, and the other end of the inner pipe is a closed end; a group of continuous micro-hole arrays or multiple groups of discontinuous micro-hole arrays are distributed between two ends ofthe inner pipe along the circumferential direction and the axial direction of the pipe wall; when a dispersion phase enters a continuous phase, vortex is formed in the annular channel. Compared withan existing sleeve type micro-channel mixer, the micro-hole vortex sleeve mixing reactor provided by the invention has the advantages that stronger micromixing is guaranteed under high treatment capacity or a higher substrate concentration; due to the formation of the vortex, the problem of blockage of small solid particles possibly produced in the process can be effectively relieved or avoided.

The invention provides an expressway traffic flow tracing and ramp regulation and control method combined with historical data, which can automatically and accurately regulate and control the trafficflow of an expressway without manual interference so as to relieve the blockage problem of the expressway and obtain a more accurate traffic regulation and control effect. According to the technical scheme of the invention, the method comprises the steps: obtaining the traffic flow proportion corresponding to each uphill ramp in the traffic flow of a congestion point of a to-be-adjusted road section according to the historical data of the traffic flow of the uphill ramps; and when a flow limiting control scheme is formulated for the uphill ramps, calculating the number of released vehicles ofeach uphill ramp and the duration time of the green light and the red light in the next control period of the to-be-adjusted road section according to the traffic flow proportion corresponding to eachuphill ramp.

The invention relates to an acid mine waste water treating device which comprises a permeable reaction well. A water distribution-collecting layer is arranged on the bottom of the reaction well in a paving mode. A mixed padding biochemical reaction and microbial fuel cell zone is in the middle of the reaction well. A microbial fuel cell and the reaction well are arranged in a concentric circle structure. A cathode of the microbial fuel cell is composed of a cylinder body defined by carbon cloth supported by a metal wire net. The position between the cylinder body and the wall of the reaction well is filled with biomass for immobilizing sulfate reducing bacteria and large-ceramsite mixed padding. The inner portion of the cylinder body is filled with municipal sewage plant activated sludge to be used as an anode zone. A carbon rod is used as an anode to be inserted into sludge. A bleeding filtering layer is arranged on the upper portion of the reaction well in a paving mode. The cathode and the anode are guided out through lead wires and are externally connected with a resistor to form a complete electric loop. The treating device can treat acid mine waste water in a home position, the pH of acid mine waste water can be adjusted to be larger than or equal to six effectively, and heavy metal ion concentration is effectively lowered.

The invention relates to a high magnesium and low calcium desulfurization wastewater softening pretreatment device and a method. The high magnesium and low calcium desulfurization wastewater softening pretreatment device consists of a settling tank, a softening tank, a flocculation tank and a clarification tank that are communicated in order. The bottom of the settling tank is connected to a first sludge discharge pipeline. The top of the softening tank is connected to a seed crystal delivery pipeline and a first agent delivery pipeline, and the bottom of the softening tank is connected to a second sludge discharge pipeline. The top of the flocculation tank is connected to a second agent delivery pipeline, and the bottom of the flocculation tank is communicated with the second sludge discharge pipeline. The bottom of the clarification tank is communicated with the second sludge discharge pipeline. The invention also relates to a high magnesium and low calcium desulfurization wastewater softening pretreatment method carried out on the basis of the high magnesium and low calcium desulfurization wastewater softening pretreatment device. The device and the method provided by the invention can achieve selective separation of Ca<2+> in desulfurization wastewater, perform wastewater softening without affecting the concentration of Mg<2+>, and reduce sediment production and lower the softener delivery amount and cost.

A jet-aerating biologic filter pool is composed of biologic oxidizing filter pool with bearing plate, bearing layer and filter layer, reverse-flushing water pump, jet aerator, circulating water pump and connecting pipeline. The oxygen aeration of jet aerator and the water circulation can create a better growth environment for microbes to decompose the organic substances in sewage.

The invention relates to a method for reduction, evaporation and concentration treatment of wastewater produced by acidic precipitation of a vanadate-leaching solution and belongs to the fields of chemical engineering and metallurgy. The invention aims to solve the technical problem of providing the method for reduction, evaporation and concentration treatment of wastewater produced by acidic precipitation of the vanadate-leaching solution. The method comprises the following steps: a, performing sand filtration on the wastewater produced by acidic precipitation of the vanadate-leaching solution through residue obtained after extracting aluminum to obtain a filtrate A; b, adding a composite settling agent and a reducing agent into the filtrate A and regulating the pH value to be 7-8 and filter-pressing to obtain a filtrate B and a solid; evaporating and concentrating the filtrate B, cooling and crystallizing, and separating out sodium sulfate and ammonium sulfate. According to the method provided by the invention, the problems of scaling and blockage inside tubes of a heat exchanger in an evaporation and concentration system are effectively solved, the utilization ratio of heat energy is improved, the expense required for cleaning the tubes of the heat exchanger is reduced, and the production cost of vanadium products is reduced. The method provided by the invention has the advantages that the technological process is simple, the separation efficiency is high, the resource utilization rate is high, the cost is low, the wastewater treatment cost can be reduced, and the comprehensive benefits of the vanadium products are improved.

The invention discloses a method and application for screening bacteria capable of relieving constructed wetland blocking.The method comprises the steps of 1 bacteria enrichment, wherein wetland blockages are taken for bacteria enrichment; 2, bacteria preliminary screening, wherein enriched bacteria are cultured through a thickened filter paper culture medium, the bacteria producing cellulase degeneration enzymes can form spots on filter paper, and the spots are taken for pure culture; 3, bacteria secondary screening, wherein a bacterial strain subjected to the pure culture is inoculated into a blood agar culture medium, and a bacterial colony producing blood-plate hemolysis is taken; 4, bacteria optimization, wherein surfactant can form oil spreading circles on oil film, and bacteria of the largest oil spreading circle serve as optimal bacteria; and 5, screening bacteria product identification.According to the application for screening the bacteria capable of relieving constructed wetland blocking, the strains producing biosurfactant with larger yield are screened out; the screened strains produce the biosurfactant to relieve constructed wetland blocking, screened bacteria sources adopt constructed wetland bacteria, and the produced biosurfactant is efficient, easy to biologically degrade and capable of safely relieving constructed wetland blocking.

An abrasion-resistant abrasive paper provided with a porous structure comprises a paper substrate layer (1) and a bottom adhesive layer (4), wherein a mesh fabric layer (2) is stuck to the bottom surface of the paper substrate layer (1); a large particle abrasion-resistant layer (5) is arranged on the upper surface of the bottom adhesive layer (4); the outer surface of the large particle abrasion-resistant material is coated with compound glue (6); a small particle super coating (7) is laid on the compound glue (6); and micropores (3) penetrating through the paper substrate layer (1) and the bottom adhesive layer (4) are pressed in the surface of the paper substrate layer (1). According to the abrasion-resistant abrasive paper provided with the porous structure, the small particle super coating is stuck to and fixed with the outer surface of the large particle abrasion-resistant material, therefore, the abrasion resisting property is improved, and the service life of the large particle abrasion-resistant layer is prolonged; and further, the micropores penetrating through the paper substrate layer and the bottom adhesive layer are pressed in the surface of the paper substrate layer, accordingly, blockage caused by dust and small fragmentary particles on the surface of the abrasive paper can be relieved to a certain extent, the grinding effect is improved, and the service life of the abrasive paper is prolonged greatly.