18results about How to "Reduce total nitrogen" patented technology

The invention discloses an ultra-low emission treatment system and device for Maotai-flavor liquor production wastewater, the wastewater passes through a combination of a rotary mechanical fine grid and a self-cleaning rotary fine grid, and various solids in the wastewater are thoroughly removed; in the pretreatment, precipitation and air floatation are combined, and a phosphorus removal agent, a coagulant and a flocculant are properly added, so that the phosphorus removal burden in the subsequent treatment is reduced. A UASB anaerobic reactor is adopted in the anaerobic treatment section, so that the phenomena of acidification and the like are not easy to occur. The biological treatment adopts an improved two-stage AO treatment process and is combined with an MBR (Membrane Bioreactor), so that the removal effect of COD (Chemical Oxygen Demand) and total nitrogen can be integrally improved, and the suspended solids, COD and total nitrogen concentration in effluent are reduced. In the deep treatment stage, catalytic ozonation and an MBBR biological treatment device are adopted, and a combined process of an efficient sedimentation tank and ultrafiltration / nanofiltration is combined; ozone catalytic oxidation enhances the oxidation capacity of ozone, and improves the B / C ratio and biodegradability of wastewater; mBBR biological treatment has the characteristics of a membrane method and a suspension method, and COD and total nitrogen in the wastewater are further effectively reduced.

The invention relates to the technical field of sludge treatment, and discloses a sludge treatment method based on sludge reduction and ammonia nitrogen recovery, which comprises the following steps: 1) alkali thermal hydrolysis: adding alkali into sludge to adjust the pH value to 9-11, and carrying out thermal hydrolysis reaction; (2) wet oxidation: heating after reaction and discharging, and carrying out wet oxidation reaction; (3) flash evaporation: carrying out heat recovery after reaction discharging, and carrying out flash evaporation to obtain a sludge mixed solution and flash evaporation steam; (4) dewatering: performing heat recovery on the sludge mixed solution, and then dewatering to obtain a sludge cake and filtrate; and (5) ammonia nitrogen air stripping: carrying out ammonia nitrogen air stripping on the filtrate by adopting steam, wherein the filtrate after air stripping can be reused as a carbon source for sewage treatment. According to the method, the oxidative degradation efficiency of the sludge is improved through coupling of alkali thermal hydrolysis and wet oxidation treatment, ammonia nitrogen recovery and sludge reduction are facilitated, and the filtrate has the characteristics of high COD and low total nitrogen and is more suitable for being used as a carbon source.

The invention relates to flocculation application of paenibacillus polymyxa FangSG106, a product of the paenibacillus polymyxa FangSG106 and a method of the product, and belongs to the technical field of microorganisms. The invention provides a flocculation or water purification application of paenibacillus polymyxa FangSG106 with a preservation number of CGMCC (China General Microbiological Culture Collection Center) No.31655 and an application of the paenibacillus polymyxa FangSG106 in preparation of a biological flocculant or a water purifying agent, further provides the biological flocculant or the water purifying agent based on the paenibacillus polymyxa FangSG106, and also provides a method for removing heavy metals and a water purifying method. The paenibacillus polymyxa FangSG106 disclosed by the invention has broad-spectrum antibacterial activity, and can be used for effectively removing heavy metals and purifying water.

The invention discloses a centralized wastewater treatment device and method for a food park, and the method comprises the following steps: low-concentration wastewater passes through a first grid and then enters a comprehensive oil removal adjusting tank, and high-concentration wastewater passes through a second grid and a high-concentration oil removal adjusting tank in sequence and then is pumped into the comprehensive oil removal adjusting tank; effluent of the comprehensive oil separation regulating tank sequentially passes through an air floatation tank, a primary sedimentation tank, an internal circulation anaerobic reactor, an A / O tank, a secondary sedimentation tank and a magnetic coagulation sedimentation tank, and is discharged after reaching the standard. According to the invention, the food park enterprise wastewater is collected for centralized treatment, through physicochemical pretreatment of the front-end air floatation tank and the primary sedimentation tank, biochemical treatment of the middle-end internal circulation anaerobic reactor and the A / O tank, and deep physicochemical treatment of the tail-end magnetic coagulation sedimentation, insoluble reducing substances, SS, chromaticity, total nitrogen and total phosphorus in the wastewater are effectively reduced, the treatment effect is good, and the efficiency is low; meanwhile, the biochemical treatment process combines internal circulation and external circulation, so that self-digestion of the sludge is realized.

The invention discloses a pharmaceutical wastewater treatment method, and relates to the field of wastewater treatment. Comprising the following steps: carrying out evaporation salting-out treatment on high-salt pharmaceutical wastewater in advance, adjusting water quality and water quantity of evaporation condensate water and general pharmaceutical wastewater in an adjusting tank, and precipitating in a primary settling tank; the wastewater enters a primary catalytic ozonation tank for oxidation treatment, enters a biochemical treatment procedure, enters a secondary sedimentation tank for sedimentation, and effluent enters a secondary catalytic ozonation tank for oxidation treatment and enters an activated carbon filter tank for treatment. Aiming at the characteristics of high salinity, high ammonia nitrogen concentration and high toxicity of pharmaceutical wastewater, the salt concentration is reduced by adopting evaporation salting-out treatment, and the biodegradability is improved by utilizing oxidation treatment of the first-stage catalytic ozonation pond, so that the subsequent biochemical treatment efficiency is high, and a large amount of organic matters are decomposed; and a secondary ozone catalysis tank and an activated carbon filter tank are subsequently adopted to remove residual pollutants in the wastewater, so that the COD (Chemical Oxygen Demand), ammonia nitrogen, total phosphorus, total nitrogen and suspended matter concentration of effluent are low, and the effluent can stably reach emission indexes.

This invention discloses a method for controlling sulfides in sulfur-containing gear steel, belonging to the field of metallurgical technology, including converter, LF refining, RH refining, and continuous casting processes. Converter process: molten steel tapping temperature 1630±20℃, carbon-oxygen product controlled below 0.0020; LF refining process: aluminum content in molten steel controlled at 0.035-0.045%, LF slag composition adjusted to R: 1.5-2.5, FeO+MnO: 1.0-2.0%; RH refining process: ferrotitanium added in one step to adjust the composition appropriately; Continuous casting process: argon-blown stopper rods and submerged entry nozzles are used for continuous casting, and 150-200 kg of low-basicity tundish covering agent is added to the tundish. The sulfur-containing gear steel produced by this invention can be continuously drawn for more than 10 heats, and the level of Class A inclusions can be stably controlled at A coarse ≤ 1.0 grade and A fine ≤ 1.5 grade, with a pass rate of over 99.9%.

The invention provides a preparation method of low-nitrogen steel and the low-nitrogen steel, and belongs to the field of smelting. The method comprises the steps that molten iron is smelted in a converter, CO2 and Ar are blown from the bottom in the whole process, and first molten steel is obtained; the converter smelting mode is a low-nitrogen control mode, and the static slag thickness of converter smelting is larger than or equal to 300 mm; the first molten steel is subjected to converter tapping, a first alloy is added in the converter tapping process, and second molten steel with set chemical components is obtained; the second molten steel is subjected to refining treatment, a second alloy is added into the molten steel in the later stage of refining treatment, and third molten steel is obtained; and the third molten steel is subjected to continuous casting, and the low-nitrogen steel is obtained. Through low-nitrogen control based on the converter and by utilizing the influence of different alloy elements on the nitrogen solubility, the adding sequence of the alloy in the smelting process is optimized, the nitrogen increase of molten steel in the smelting process is reduced, the nitrogen control effect of the low-nitrogen steel is improved, and stable production of the low-nitrogen steel is realized.

The invention discloses a transverse crack control method for a niobium-containing steel casting blank, which comprises the following steps of: for a steel type with the niobium mass content of 0.02-0.15%, adopting tundish cover argon blowing and tundish sealing to reduce the nitrogen content in the tundish atmosphere to be below 2%; according to the mass content of steel grade carbon, soft reduction is not adopted or the reduction amount is smaller than 3 mm; the amplitude of the crystallizer is reduced, and the amplitude is controlled within 5 mm; and the amount of cooling water in continuous casting secondary cooling 2-5 zones is reduced, and the specific water amount is not more than 0.8 L / kg. According to the method, through tundish cover argon blowing and tundish sealing, nitrogen in air entering molten steel is reduced, nitrogen increasing of continuous casting molten steel is greatly reduced, and then the separation amount of niobium nitride in the casting blank cooling process is reduced; meanwhile, different soft reduction processes are adopted for steel types with different carbon contents, and under the condition that the requirements for center segregation and center looseness in the casting blank are met, the expansion of cracks on the surface of the casting blank is reduced.

The invention relates to the technical field of sewage treatment, in particular to a system and method for treating sewage with total nitrogen reaching the standard in winter based on a CASS (cyclic activated sludge system) process, and the system comprises a water distribution channel which is used for being communicated with an external sewage pipe; the multiple groups of CASS biochemical reaction tanks are communicated with the water distribution channel, and the communication states of at least two groups of CASS biochemical reaction tanks and the water distribution channel are opposite; the regulating tank is communicated with the water distribution channel, and the regulating tank is communicated with the CASS biochemical reaction tank; according to the present invention, the continuous treatment and the continuous water discharging of the sewage can be achieved through the multiple groups of the CASS biochemical reaction tanks, the nitrification liquid in the CASS biochemical reaction tanks flows back to the adjusting tank, and the anoxic environment in the adjusting tank is maintained; the effects that the total nitrogen of the sewage is reduced to reach the standard and the transformation cost is low can be achieved under the conditions that the temperature is low in winter and a sewage treatment plant cannot add a new site.

The invention discloses a tail water treatment system and method for breeding micropterus salmoides offspring seeds by using containers. The bottoms of a plurality of breeding containers of the tail water treatment system are communicated with a tail water collection pipeline through second branch pipelines; the tail water collecting pipeline is also connected with a water inlet of the microfilter; a water outlet of the microfilter is communicated with a drainage ditch in the vineyard through a third branch pipeline; the vineyard is connected with the right side of the ecological pond through a fourth branch pipeline; according to the method, the purpose of planting the weever and the grape together is achieved, in-situ treatment and ex-situ treatment of the breeding tail water are combined, carps in the breeding container mainly eat residues and residual feed at the bottom of the container, the content of granular nitrogen and phosphorus in total nitrogen and total phosphorus in a water body of the breeding container is reduced, and after the breeding tail water is treated by the microfilter, the content of the granular nitrogen and phosphorus in the water body is reduced. The solid substance is used as a fertilizer for grape growth in a vineyard, grape vines grow better, and duckweed in the ecological purification pond is used for feeding grass carp fries.

The invention belongs to the technical field of casting, and particularly relates to a die casting protection casting device and a using method thereof. The die casting protection casting device is connected to a ladle nozzle in a sealed mode and comprises an upper sealing assembly, a lower sealing assembly and an adjusting device, and the upper sealing assembly and the lower sealing assembly are connected in a sealed and pressed mode. The adjusting device is connected to the steel ladle casting vehicle and connected with the upper sealing assembly. A ladle nozzle and a molten steel flowing area are wrapped, non-oxidation protection in the whole casting process is achieved, and the casting blank quality is improved.

The utility model relates to a wastewater treatment system for Maotai-flavor liquor. The wastewater treatment system comprises a neutralization tank, an anaerobic tower, an MAP reaction tank, a multi-stage AO tank, a Fenton tank, a powdered activated carbon membrane biological reaction tank and a resin denitrification tank which are connected in sequence, the neutralization tank is connected with a liquid alkali adding device, and the water outlet end of the neutralization tank is connected with the water inlet end of the multi-stage AO tank; the anaerobic tower is provided with a biogas collecting device; the MAP reaction tank is divided into a dosing area, a reaction area and a separation area; the water outlet end of the multi-stage AO tank is connected with the water inlet end of the Fenton tank through the secondary sedimentation tank; the Fenton tank is provided with a Fenton feeding device and a Fenton stirring device; the powdered activated carbon membrane biological reaction tank is provided with a powdered activated carbon feeding device and a membrane biological reaction aeration device, and an ultrafiltration membrane separation device is arranged in the powdered activated carbon membrane biological reaction tank. The wastewater treatment system can efficiently remove COD (Chemical Oxygen Demand), ammonia nitrogen, total nitrogen and total phosphorus in Maotai-flavor liquor wastewater, can recover energy and nitrogen-phosphorus fertilizers, and has considerable environmental benefits and economic benefits.

The utility model relates to the technical field of water treatment, in particular to a sewage deep nitrogen and phosphorus removal treatment device which comprises a first reaction tank, a second reaction tank, a sedimentation tank and a third reaction tank which are connected in sequence, the first reaction tank is used for carrying out denitrification treatment on the sewage, so that nitrate in the sewage is reduced into nitrogen, and the total nitrogen concentration of the sewage is reduced; the second reaction tank is used for carrying out aerobic treatment on the sewage, so that ammonia in the sewage is oxidized into nitric acid, and phosphorus, organic matters and chemical oxygen demand in the sewage are reduced; the third reaction tank is used for carrying out denitrification treatment on the sewage. The sewage treatment device has the beneficial effects that denitrification and aerobic reaction processes are optimized according to the quality of sewage, the denitrification reaction time is prolonged through the first reaction tank, organic matters in inlet water are fully utilized for denitrification nitrogen removal, and meanwhile, chemical oxygen demand and total nitrogen are removed. The second reaction tank is used for completing nitration reaction and further reducing the chemical oxygen demand of the sewage.

The present invention discloses a vehicle-mounted mobile emergency treatment method for landfill leachate, comprising the following steps: setting a mobile vehicle-mounted emergency treatment system for landfill leachate, first subjecting the leachate to nanofiltration treatment; the nanofiltration effluent enters the nitrite-anaerobic ammonia oxidation treatment, and the nanofiltration concentrate is subjected to polyferric coagulation treatment, and the supernatant is mixed with the nitrite-anaerobic ammonia oxidation treatment effluent for subsequent deep treatment; after treatment in a denitrification aerated biological filter chamber, denitrification treatment is performed; entering an ozone aerated biological filter chamber, decomposing and destroying the refractory organic matter to carbonize, and then further removing the residual organic matter and ammonia nitrogen in the wastewater, and finally the effluent meets the standards for external discharge. The present invention also discloses a system for implementing the method, which is an integrated system in which all components are arranged in a container, which is convenient for vehicle-mounted movement and operation. The present invention has no concentrated liquid discharge, does not require an external carbon source, saves aeration volume, has low sludge production, and is suitable for emergency treatment.

The application discloses a kind of deep denitrification continuous flow aerobic granular sludge reactors and control method thereof, belong to wastewater treatment field.Reactor includes the anaerobic pool, aeration tank, anoxic tank, sludge separator and secondary sedimentation tank connected in sequence, and also includes intelligent control system.Control method includes: real-time monitoring state variable;According to the deviation of state variable and preset target value, the control input of last time and control barrier function, build performance function;Approximate long-term cost function using fractional kernel function;Calculate update error and update weight coefficient;Solve optimization problem to obtain control input;Execute control instruction.The application carries out intelligent optimization and closed-loop control to key operating parameters by safety reinforcement learning algorithm, maintains stable treatment effect when influent quality and quantity fluctuate, realizes efficient, stable, self-adapting deep denitrification operation, and has strong impact load capacity.

The invention provides a device and method for treating nitrogen oxides generated by cyclohexanone oximation wastewater, the device comprises an air blower, a tail gas absorption tower, a first circulating pump and a condenser, the air inlet of the air blower is aligned with yellow smoke gas generated in the cyclohexanone oximation wastewater treatment process, and the exhaust port of the air blower is introduced into the bottom of the tail gas absorption tower; the bottom of the tail gas absorption tower is communicated to the top of the tail gas absorption tower through a circulating pipeline and extends into the tail gas absorption tower to be communicated with a liquid distributor, a first circulating pump and a condenser are sequentially arranged on the circulating pipeline, and an input pipeline is connected to the position, close to the top of the tail gas absorption tower, of the circulating pipeline; the input pipeline is used for introducing a dilute nitric acid solution, and the circulating pipeline is provided with an output pipeline at a position between the condenser and the top of the tail gas absorption tower. The method realizes atom recovery and cyclic utilization, reduces total nitrogen in wastewater, is economical and environment-friendly, and has good sustainability; meanwhile, the treatment cost of the wastewater can be reduced.

This utility model discloses an artificial enhanced aquatic ecosystem restoration system, mainly relating to the field of aquatic ecosystem restoration technology. The artificial enhanced aquatic ecosystem restoration system of this utility model is characterized by comprising a pretreatment system, an enhanced denitrification system, an artificial wetland system, a main control system, and a power supply system. The artificial enhanced aquatic ecosystem restoration system of this utility model has high removal efficiency for suspended solids, organic matter, and pollutants such as nitrogen and phosphorus in water bodies. Compared with existing technologies, this utility model has advantages such as enhanced denitrification, high integration, low carbon emissions and energy saving, good treatment effect, and low operating cost.

The application discloses a preparation method of 700MPa girder steel with excellent low-temperature toughness for high-cold regions, and belongs to the technical field of steel metallurgy, and comprises the following steps: S1, selecting a low-carbon mode for converter smelting, suppressing nitrogen increase through top and bottom combined blowing to strengthen the molten pool stirring, performing slag washing when tapping, and forming slag in advance; S2, LF refining, controlling nitrogen under 0.2MPa micro-positive pressure, creating low-melting-point refining slag and extreme desulfurization, removing large-size non-metallic inclusions, and performing modification treatment on residual MnS and Al2O3 by calcium treatment to remove small-size non-metallic inclusions; S3, full-process protection pouring of slab continuous casting, optimizing the electromagnetic stirring of the crystallizer, dynamic soft reduction, and cooling capacity of the secondary cooling zone under the premise of low superheat, and shortening TiN precipitation time; and S4, sequentially performing heating, rough rolling and finish rolling, and performing finish rolling in the austenite region, and rapidly cooling high-temperature austenite by low coiling, so that TiN is precipitated in a finer and more dispersed form.