42results about How to "Reduce the probability of accumulation" patented technology

The invention discloses an immobilized nitrobacteria enrichment culture method and device in a sewage treatment process. A sequencing-batch biomembrane activated sludge process is utilized to perform enrichment culture on nitrobacteria: dewatered sludge is inoculated in an immobilized nitrobacteria culture device, and an enrichment culture solution is added; and in the nitrobacteria enrichment culture process, the biomembrane ammonia nitrogen load is gradually enhanced, and the pH value is controlled. The enrichment culture solution is formed by mixing NH4HCO3 and pretreated municipal sewage, the ammonia nitrogen concentrations are respectively 100, 300, 500, 700 and 1000 mg/L, and the COD (chemical oxygen demand) concentration is 30-60 mg/L. By controlling the immobilized nitrobacteria culture device, the DO in the reaction mixture is 2-6 mg/L, the pH value is 6.5-8.0, the biofilm-formation acclimatization culture temperature is 10-14 DEG C, and the enrichment purification culture temperature is 15-25 DEG C. The device can be used for culturing nitrobacteria at low temperature, and the nitrobacteria content is up to 40-45%. The immobilized nitrobacteria have high low-temperature nitration resistance, and can treat the wastewater of which the ammonia nitrogen concentration is up to 1000 mg/L, so that the ammonia nitrogen in the wastewater is lowered to 1.0 mg/L or below.

A dustproof axial-flow fan device includes an axial-flow fan and a mount body. The axial-flow fan has a frame body and a fan propeller rotatably mounted in the frame body. The mount body has an inlet and an outlet. At least one shutter slat is disposed at the inlet. A filter mesh is disposed at the outlet. An opening is formed at a bottom of the mount body. When the fan propeller forward rotates, air flows from the inlet into the mount body and filters through the filter mesh to flow out of the outlet. When the fan propeller reversely rotates, the shutter slat is closed to block the inlet. In this case, the air flows from the outlet into the mount body to blow off the dust from the filter mesh. The shutter slat will stop and make the dust drop out from the opening to remove the dust.

The invention discloses a method for screening and enrichment culture of nitrifying bacterium floras with alternation of intermittent ammonia nitrogen flow and intermittent operation, and belongs to the technical field of water treatment. According to the method, activated sludge containing nitrifying bacteria is used as inoculation sludge, and the screening and enrichment culture of the nitrifying bacterium floras are achieved by using a bacterial fermentation tank by virtue of a method for alternation of intermittent ammonia nitrogen flow and intermittent operation. The initial ammonia nitrogen load is gradually increased by using intermittent operation so as to improve the ammonia-nitrogen oxidation rate, and the ammonia nitrogen flow and intermittent operation maintain the ammonia-nitrogen oxidation rate and achieve a low nitrite accumulation rate. By adopting the method, the screening and enrichment culture of the nitrifying bacterium floras can be achieved in a short time. The nitrifying bacterium floras obtained by the method disclosed by the invention have an advantage in numbers in total bacterial count, and a high ammonia-nitrogen oxidation rate and a high nitrite oxidation rate can be achieved.

A variable geometry turbine comprises a turbine wheel and a primary inlet passage of variable axial width. The turbine has a secondary inlet passage provides a flow path for a working fluid which circumnavigates at least part of the primary inlet passage. A seal element and one or more apertures are cooperable to selectively allow or prevent fluid flow through the secondary inlet passage. The ratio of the minimum cross-sectional area of the flow path through the primary inlet passage to that of the secondary inlet passage is between 1.3 and 1.7.

A sewage denitrification method for rapidly realizing synchronous short-range nitrification-denitrification relates to a rapid sewage denitrification method. Methods: 1. Expanded culture of aerobic denitrifying bacteria; 2. Centrifuge the expanded cultured bacteria liquid to collect the bacteria and make a bacterial suspension; 3. Mix the bacterial suspension with the embedding solution, and then drop it on Cross-link in the agent overnight to get the bacterium ball; 4. Add the bacterium ball to the SBR reactor that has realized the short-cut nitrification to complete. In the present invention, adding the fungus balls to the SBR reactor does not affect the operation of the short-range process, and at the same time, it can effectively denitrify NO2--N into nitrogen to realize synchronous removal, and the removal effect of ammonia nitrogen is stable, which can be maintained at more than 90%. Ammonia nitrogen can basically be maintained below 5mg/L; the COD removal rate reaches over 90%, and the average COD of the effluent is 25.5mg/L; effectively improves the processing capacity of the process for pollutants, with short cycles and low energy consumption.

The invention discloses indoor decoration wallpaper, which comprises a wallpaper base material layer and a coating layer, wherein the coating layer is arranged on the wallpaper base material layer; a waterproof coating is arranged at the back side of the wallpaper base material layer; an air hole layer is arranged under the coating layer; first ventilation holes are uniformly distributed in the air hole layer; second ventilation holes are formed between the adjacent first ventilation holes; the diameter of the second ventilation holes is smaller than the radius of the first ventilation holes; a bamboo charcoal layer is arranged on the coating layer; a waterproof layer is arranged on the bamboo charcoal layer; a reinforcing layer is arranged on the waterproof layer; an antibacterial layer is arranged on the reinforcing layer; an air purification layer is arranged on the antibacterial layer; an adsorption layer is arranged on the air purification layer; an appearance layer is arranged on the adsorption layer; decoration bulges are arranged on the appearance layer. The indoor decoration wallpaper has the advantages of moisture absorption, ventilation, antibacterial effect, anti-corrosion effect, strong ventilation performance and the like; harmful substances in the air can be absorbed; faint scent can be released; the indoor air can be purified; green and environment-friendly effects are achieved; the living life of people is facilitated; in addition, the service life is long; the appearance is attractive.

An adsorbent for reducing uremic toxins in vivo includes polyacrylonitrile-based activated carbon fibers having the following properties: a) an average diameter of 5 μm to 30 μm; b) a BET specific surface area of more than 390 m²/g; c) a total acidic group content of larger than 1.2 meq/g or a total basic group content of larger than 1 meq/g. Because the adsorbent of the present disclosure has a higher adsorption capacity for precursors of uremic toxins than for the normal enzyme protein in intestinal tract, the adsorbent of the present disclosure can effectively prevent the deterioration of renal function, and thus can be used as a therapeutic agent and a preventive for kidney disease.

An element having an immersible portion for contact with an aqueous liquid, the immersible portion having a contact surface for contact with the aqueous liquid, the contact surface configured to have strong acidity, a radiation (e.g., ultraviolet radiation) source assembly, a radiation (e.g., ultraviolet radiation) source module and a fluid (e.g., water) treatment system incorporating this element applicable to any surface in contact with fluid that is susceptible to build-up of fouling materials. The embodiments obviates or mitigates the rate of accumulation of fouling on surfaces in contact with aqueous solution, such as the protective (e.g., quartz) sleeves in an ultraviolet radiation fluid treatment system, by modifying at least a portion of the surface of those sleeves in contact with fluid (e.g., water) to have an inherent strong surface acidity.

The invention relates to a continuous casting porous stopper rod which comprises a rod body and a rod head connected with the rod body, and further comprises a blowing channel arranged in the rod body, blowing branches used for conveying shielding gas, arranged on the rod head, connected with the blowing channel and used for distributing the shielding gas conveyed by the blowing channel to all directions; the number of the air blowing branches is at least two, and the air outlet direction of the at least two air blowing branches has components in the circumferential direction of the stopper rod. Due to the fact that the air outlet directions of the multiple air blowing branches have components in the circumferential direction of the stopper rod, the multiple air blowing branches face the same circumferential direction, bubbles rotating around the rod head are formed around the rod head, surrounding molten steel is driven to rotate, and attachments in a water gap can be better cleaned.

The flour mill for wheat processing comprises a mounting box, a speed regulating mechanism is arranged in a cavity of the mounting box, the speed regulating mechanism comprises a first limiting plate and a second limiting plate which are fixedly connected with the mounting box, and a second driving motor is arranged at the top of the first limiting plate; a cam is arranged on one side of the second driving motor, the output end of the second driving motor is in transmission connection with the cam through a belt and a belt wheel, a shielding plate is hinged to the bottom of the second limiting plate, and the cam is in sliding connection with the shielding plate. A baffle plate is in clearance rotation through rotation of a cam, so that wheat output in a feeding pipe is conveniently subjected to speed regulation, the wheat is prevented from reaching a guide plate too fast, a moving plate is driven to move through rotation of a second rotating shaft in cooperation with an incomplete gear, an impact head impacts the bottom of the feeding pipe in a reciprocating mode, and the wheat output speed is increased. And wheat accumulated at the bottom of the feeding pipe can be conveniently shaken down.

The invention relates to a mixing mechanism and a self-compacting concrete mixer for a rail transit precast slab rail structure. The mixing mechanism is used for being arranged in a hopper in a rotating mode so as to mix self-compacting concrete in the hopper. The mixing mechanism comprises a shaft sleeve and multiple blade assemblies, the shaft sleeve is used for sleeving a driving rotating shaftand is in transmission connection with the driving rotating shaft, the multiple blade assemblies are arranged in the circumferential direction of the shaft sleeve at intervals, each blade assembly comprises a transverse mixing part and a vertical mixing part, one ends of the transverse mixing parts are arranged on the shaft sleeve, the other ends of the transverse mixing parts are connected to one ends of the vertical mixing parts, an included angle is formed between the lengthwise direction of each vertical mixing part and the lengthwise direction of the corresponding transverse mixing part,and the sides, deviating from the vertical mixing parts, of the transverse mixing parts are used for making contact with the bottom wall of the hopper in a sliding mode. According to the mixing mechanism and the self-compacting concrete mixer for the rail transit precast slab rail structure, due to the arrangement of the mixing mechanism, the mixing effect of the self-compacting concrete mixer for the rail transit precast slab rail structure is better.

The invention belongs to the field of stamping dies, and particularly relates to a stamping die for sheet metal stamping, which comprises an upper die, a lower die, a support table and a pushing component. A plurality of punches are installed on the bottom face of the upper die, a metal sheet is slidably installed in a groove in the top face of the lower die, a plurality of waste holes are formed in the bottom face of the groove in the top face of the lower die, supporting tables are fixedly connected to the bottom faces of the two sides of the lower die, a push plate is slidably installed between the supporting tables on the two sides, and a transmission unit is installed on one side of the push plate. The top end of the transmission unit is fixedly connected with the side surface of the upper die; the upper die and the lower die are pushed by a punching machine to be closed, the punch is driven to punch a metal sheet, waste falls down from the waste hole, the upper die descends to conduct power transmission through the transmission unit, the push plate is pushed to slide between the supporting tables on the two sides, the falling waste is pushed out, the waste accumulation probability is reduced, the workload of workers is reduced, and the production efficiency is improved. And the safety of workers during working is improved.

The invention relates to an urban road comprehensive drainage system and an urban road, and belongs to the technical field of road engineering, the urban road comprehensive drainage system comprises a roadbed and drainage channels, a foundation pit is formed in the roadbed, the drainage channels are arranged on the two sides of the foundation pit, drainage openings are formed in the drainage channels, and a plurality of water guide channels are formed in the bottom wall of the foundation pit; the two ends of the water guide channel communicate with the two drainage channels correspondingly, a water seepage layer is arranged in the foundation pit, and a supporting assembly used for supporting the water seepage layer is arranged in the foundation pit. The method has the effect of reducing accumulated water possibly existing on the urban road surface so as to improve the drainage efficiency of the urban road.

The invention discloses a semiconductor structure and a forming method thereof. The forming method comprises the steps of providing a substrate; forming a mask layer on the substrate; forming a compensation side wall on the side wall of the mask layer; etching the base by taking the mask layer and the compensation side wall as masks to form a substrate and fin parts protruding out of the substrate; removing the compensation side wall; and after the compensation side wall is removed, forming an isolation layer covering part of the side wall of the fin part on the substrate exposed out of the fin part. After the fin parts are formed, the compensation side walls are removed, then the isolation layer is formed, the process of forming the isolation layer comprises the step of filling the space between the fin parts with the isolation material layer, the size of the top opening of the opening defined by the mask layer, the fin parts and the substrate is large by removing the compensation side walls, and therefore in the process of depositing the isolation material layer, the bottom of the opening is easily filled with the isolation material layer, so the probability of accumulation of the isolation material layer at the top of the fin part is reduced, the extrusion force of the isolation material layer on the fin part is reduced, the problem of fin part bending is improved, and the performance of the semiconductor structure is improved.