66 results about "Nitrogen cycle" patented technology

The invention belongs to the technical field of ecological engineering, particularly relating to a multifunctional lake ecology restoration simulation device and use method as well as application. The device comprises a multifunctional ecology restoration simulation test cylinder, a light source control system and a water temperature control system, wherein the light source control system and the water temperature control system are positioned outside the top of the test cylinder; the outer surface of a reaction cylinder is provided with a top cover, a culture liquid inlet and a circulating water outlet; the middle of the reaction cylinder is provided with a water sampling port, and the lower part of the reaction cylinder is provided with the circulating water inlet, a substrate sludge pore water sampling port and a bottom plug; and the test cylinder internally comprises a nitrogen cycle bacteria carrier, submerged plants and settings. By using the method and device, the comprehensive regulation and control as well as optimization of parameters such as settings, submerged plants, denitrification microorganism, water temperature, light and water quality can be carried out, lake and inflowing riverway nutrient salt can be simulated and controlled, and a lake ecology restoration mechanism can be studied. The device disclosed by the invention is simple in structure, is strong in mobility, is diversified in restoration simulation function, is simple in manufacturing, is low in cost and is easy to operate, and can be used indoor and outdoor.

A precise quantization method for nitrogen cycle of a lake ecosystem includes 1), applying an isotope pairing method to quantitatively research nitrogen migration and conversion of a sediment-water interface of the lake ecosystem; 2), determining release of nitrogen of a water-gas interface by measuring N2O yield by the aid of a closed chamber-gas chromatograph method; 3), measuring biomass of aquatic plants and nitrogen content in bodies of the aquatic plants by the aid of a Dumas method and determining nitrogen absorbed quantity of the aquatic plants; 4), measuring biomass of microorganisms in the ecosystem by the aid of an MPN (most probable number) method, and measuring the effect of the microorganisms in a nitrogen conversion process and conversion quantity of the microorganisms to the nitrogen; and 5), applying the stable isotope technology to measure assimilation of aquatic animals to the nitrogen, and realizing precise quantization of the nitrogen, namely, measuring a food web of the aquatic animals and a trophic-level structure to determine migration and conversion of the nitrogen in the food web. Procedures of the precise quantization method are realized in the same simulation ecosystem.

The invention provides a low-temperature liquefied natural gas (liquefied natural gas) in a boil-off gas (boil-off gas, BOG) transport storage tank. Apparatus for reliquefaction of liquefied natural gas vapors, comprising a compressor for compressing methane in a storage tank for liquefied natural gas, a condenser for at least partial condensing of the methane compressed by the compressor, and nitrogen cycle equipment to supply heat and cold to the compressor from condensation The reliquefied vapor is returned from the compressor to the storage tank, and the vapor gas is compressed by the compressor in the pre-cooled condenser, so the advantage is that the temperature of the reliquefied vapor is maintained within a preset range even if the quantity or temperature of the reliquefied vapor changes. Further, the present invention incorporates a cooling device constituting a low temperature section in the device for reliquefied LNG in order to reduce the size of the device for reliquefied LNG and stably process a low temperature range of nitrogen gas without cold heat loss.

The invention provides a method for measuring a contribution rate of a plant root system to nitrification and denitrification of soil. The method comprises the following steps: selecting a 20m*20m sample area in a forest or in a field, selecting five 2m*2m small units in the sample area according to an S-shaped point sampling method, digging ditches with widths of 0.3m and depths which exceed the root depth by 0.2m around the small units, inserting fiber glass into the ditches to stop roots from growing inwards, and filling back the dug soil into the ditches; then sampling by adopting a cutting ring, measuring nitrification and denitrification rates of the soil in the 2m*2m small units by utilizing a BaPS soil nitrogen cycle monitoring system, simultaneously measuring nitrification and denitrification rates in adjacent 2m*2m small units, and calculating the contribution rate of the plant root system to the nitrification and denitrification process of the soil according to a formula. The method is used for guiding to measure how the root system influences the forest soil ecological system and regulates carbon-nitrogen balance, and has an important effect of knowing about participation of a root system layer of the integral forest in geobiochemical nitrogen cycle.

A process for effectively screening the nitrogen cycling bacteria used to repair the ecological environment of water and treat water includes such steps as acquiring the water sample containing local nitrogen cycling bacteria, respectively preparing the culture media for ammonifying bacteria, nitrosifying bacteria, nitrifying bacteria and denitrifying bacteria, culturing, separating, purifying and using the bacterium with high conversion rate as the preferable one.

The invention discloses a hyperspectral remote-sensing monitoring method for a wetland soil nitrification microbial community. The method comprises the following steps: measuring wetland soil spectrum and nitrification microorganisms in a monitoring area; pretreating hyperspectral remote-sensing images, wherein format conversion, absolute radiance value conversion, atmospheric correction and geometric precise correction are performed; building a model based on the experimental measurement spectrum, and estimating the quantity of the wetland soil nitrification microorganisms in the monitoring area with the model; estimating the quantity of the wetland soil nitrification microorganisms based on the pretreated hyperspectral remote-sensing images; confirming the optimal value of the quantity of the wetland soil nitrification microorganisms based on a cost function. The method has the benefits that the distribution of the nitrification microorganisms on a regional scale can be extracted, so that obtaining of the time-space evolution characteristics of soil nitrification and the driving factor information can be facilitated, and a scientific basis is provided for correct understanding of the wetland nitrogen cycle process and influence mechanism, and the wetland pollution purification function.

The invention discloses a CO cryogenic separation system using double circulation. The CO cryogenic separation system comprises main heat exchangers, a low-temperature separator, a hydrogen stripping tower, a denitriding tower, a demethanizer, a CO compressor and a circulation nitrogen compressor. The invention further discloses a separation method of the CO cryogenic separation system using double circulation. The method includes the processing steps of heat transfer, dehydrogenation, denitrification, demethanation, CO compression cycle, nitrogen compression refrigeration cycle and the like. The CO cryogenic separation system using double circulation and the separation method thereof have the beneficial effects that the double-circulation process of CO compression and nitrogen compression is adopted, and the dual advantages that rectification energy consumption of CO compression cycle is low and compression energy consumption and investment of nitrogen cycle are low are given into play. A heat source of a rectifying tower evaporator and a cold source of a condenser are optimized, and rectification loads can be controlled reliably and stably. Starting and purifying time of the device can further be shortened, and the evacuation amount at the starting stage is decreased. Energy consumption is low, the starting speed is high, the investment can be reduced, and the quantity of emissions is small. The general trend of energy saving and cost reduction are met, and the economic benefits and environmental protection benefits are good.

A method for quantifying ammonia oxidizing archaea in lacustrine deposit. The method comprises the following steps of (1) extracting DNA, and (2) constructing an ammonia oxidizing archaea plasmid standard substance and analyzing a sample, wherein the copy number of Ammonia oxidizing archaea in an unknown sample is obtained through processes of a detection of a Ct value of the unknown sample and a contrast of an amplification standard curve and the Ct value after the amplification standard curve is obtained. In the invention, ammonia oxidizing archaea in lacustrine deposit is detected quantificationally through a real-time fluorescent quantitative polymerase chain reaction (PCR) technology. The method is a rapid, simple and accurate method for researching a nitrogen cycle mechanism of lacustrine deposit.

The invention discloses an oxygen-rich water ecological restoration system. The oxygen-rich water ecological restoration system is characterized in that the oxygen-rich water ecological restoration system comprises an inlet pipe, a porous water distribution pipe, an outer aerobic zone, an aeration system, an overflow weir, an inner anoxic zone and a water outlet pipe; the outer aerobic zone and the inner anoxic zone are in a concentric cylindrical structure, the inlet pipe is connected with the outer aerobic zone through the annular porous water distribution pipe, the porous water distributionpipe is installed at the bottom of the outer aerobic zone, the aeration system comprises a micropore aeration pipe and an aerator, the micropore aeration pipe is arranged above the porous water distribution pipe and is connected with the aerator, the outer aerobic zone is separated from the bottom of the inner anoxic zone and is communicated with the top of the inner anoxic zone, the overflow weir is arranged on the top of the inner anoxic zone, the bottom of the inner anoxic zone is communicated with the outlet pipe, the outer aerobic zone and the inner anoxic zone are filled with particulate fillers, and aquatic plants are planted in the particulate fillers. The oxygen-rich water ecological restoration system has the beneficial effects that: in a same artificial wetland, an outer aerobic and inner anoxic function zone is formed, so that a carbon cycle and a nitrogen cycle in sewage are compactly occurred in the same artificial wetland, and land occupation areas are reduced, filler aeration can also effectively prevent clogging of a bed and prolong service life of the artificial wetland, and the oxygen-rich water ecological restoration system is especially suitable for treatmentof decentralized domestic sewage.

The invention discloses a method for measuring nitrogen cycling rate in sediment based on a continuous process, which is applied to the measurement of nitrogen cycling process in the field of ecological environment. The specific process is that: 10 equal parts of fresh sediments are weighed and taken into corresponding 100 mL serum bottles; after the serum bottles are capped and sealed, air in theheadspace of the serum bottles is replaced as mixed gas of helium and oxygen with a ratio of 2:1 by a vacuum bottle washing system; urea and deionized water are added separately; incubation is performed at 25 DEG C for 120 hours; then the gaseous nitrogen content in the headspace and the active nitrogen content in the sediment are measured separately; according to the content of various forms ofnitrogen in a treatment group and a control group, activity of the sediments in denitrification, nitrification and ammoniation processes is calculated by the use of corresponding formulas. The methodhas the advantages that operation is simple, the time cost of the traditional step-by-step measurement method is reduced; meanwhile, based on the continuous process, the reaction rate in each processof the sediment nitrogen cycle is accurately measured, and the synergistic relationship of three continuous processes is reflected, thereby avoiding the overestimation of sediment nitrogen cycling rate resulting from substrate induction measuring method.

The invention discloses a nitrogen cycle refrigeration carbon monoxide cryogenic separation device and technology, and belongs to the field of deep freeze refrigeration plants. The device mainly comprises a nitrogen compressor system and a cold box separating unit; the nitrogen compressor system adopts three stages of compressors and is used for providing cold to the overall cold box separating unit; and a main body of the cold box separating unit is a cold box, and the cold box is internally provided with a plate-fin heat exchanger, a demethanizer condenser, a demethanizer reboiler, a gas-liquid separation tank, a hydrogen-rich gas flash tank, a stripping tower, a denitrification tower and a demethanizer. By means of the cryogenic separation device, CO product gas, fuel gas, flash steam and hydrogen-rich gas can be extracted from raw material gas purified by a molecular sieve adsorption system, and therefore efficient separation of components is achieved. According to the device and technology, a single cycle nitrogen refrigerating system is adopted for providing the cold to the overall device. In the overall device, according to the optimizing condition of the heat exchange network, the pressure of nitrogen entering the compressors can be divided into two or three stages, and the energy consumption for cryogenic separation is reduced.

The invention relates to a method for planting sorghum, and belongs to the field of plant cultivation. The method includes planting germinated sorghum seeds in soil with the pH (potential of hydrogen) of 6.4-6.6 and cultivating the germinated sorghum seeds in the soil. The method particularly includes steps of sieving the soil to obtain broken soil, measuring a pH value of the soil, regulating the pH of the soil until the pH of the soil reaches 6.4-6.6, adding water into the soil and stabilizing the soil for 3-7 days; applying fertilizers to the soil and stabilizing the soil for 1-4 days to obtain cultivation soil; soaking sorghum seeds in alcohol for 3-6 s, then cleaning the sorghum seeds by water, placing the seeds in culture dishes cushioned with filter paper and then accelerating germination of the seeds in culture tanks at the temperatures of 22-28 DEG C for 3-5 days until the seeds germinate; cultivating the germinated sorghum seeds in the cultivation soil, spraying water and then cultivating the germinated sorghum seeds in culture tanks in greenhouses. The method has the advantages that the pH of the soil for planting the sorghum seeds is regulated until the pH of the soil reaches 6.4-6.6, accordingly, biological nitrification inhibitors secreted by rhizosphere of the sorghum can be maximized, nitrogen cycle can be regulated and controlled, the nitrogen utilization can be improved, and soil greenhouse gas can be reduced.

The invention relates to the technical field of agricultural ecology, and discloses an organic carbon fertilizer with a function of improving soil biological activity, which is characterized in that the organic carbon fertilizer contains cow dung and pine needles, and the weight ratio of cow dung to pine needles is 1: 1-30 based on dry matter. The organic carbon fertilizer provided by the invention is green and environment-friendly, and can be applied to soil to effectively improve the biological activity of the soil, so that the adjustment of the carbon-nitrogen cycle balance of the soil is realized, the nitrogen loss is reduced, and the optimal management and agricultural sustainable development of a farmland ecosystem are realized.

The invention discloses a variable-flow-velocity polluted-water ecological purification system. The variable-flow-velocity polluted-water ecological purification system includes a water inlet pipe, awater distribution area, a fast-stream inner layer area, a slow-stream outer layer area, a water collection area and a water outlet pipe; the water inlet pipe is communicated with the bottom of the water distribution area which is located at the bottom of the fast-stream inner layer area, the water outlet pipe is communicated with the bottom of the water collection area which is located at the bottom of the slow-stream outer layer area, and the fast-stream inner layer area is located inside the slow-stream outer layer area, wherein the water flow direction of the fast-stream inner layer area is upward, the water flow direction of the slow-stream inner layer area is downward, the bottom of the inner layer area is separated from the bottom of the outer layer area, the top of the inner layerarea is communicated with the top of the outer layer area, and the portion between the outer layer area and the inner layer area is filled with particle filter materials. Through a double-layer structure design method, padding of different permeability coefficients is used, so that the water flow velocity of an inner layer is higher than that of an outer layer; the variable-flow-velocity polluted-water ecological purification system is conducive to filtering and intercepting inorganic particles in a water inlet area and being combined with cultivation of aquatic plants, so that filtration, carbon cycle and nitrogen cycle processes of the particles in polluted water can compactly controlled in the same ecological purification system, and the purpose of effectively removing pollutants is achieved.

The invention belongs to the technical field of agriculture, and particularly relates to a method for soil improvement and remediation by using a 'quaternary' method, a compound microbial agent used in the method, and application of the compound microbial agent in soil improvement and remediation. The 'quaternary' soil improvement and remediation method starts from organic matter improvement, mineral substance improvement, biodegradation and disease resistance and growth promotion, and comprehensive improvement and remediation are carried out on soil in four aspects of soil physical structure, chemical nutrients, biological activity and soil-borne diseases through deep soil improvement and shallow soil remediation. The activity of soil carbon-nitrogen cycle related enzymes can be remarkably improved, the soil microbial population structure is optimized, the soil microbial function is improved, plant residues in soil are driven to be fermented through the interaction of disease-resistant probiotic microorganisms, beneficial microorganisms become main force of soil activity, the soil structure is improved, land is fully utilized, and the method is of great significance in sustainable development of agriculture, improvement of the income level of farmers, improvement of life of people, protection of ecological environment and the like.

An aquaponic housing unit fits over standard aftermarket aquariums. The system utilizes the natural symbiotic relationship between fish and plants to achieve adequate filtration for the aquarium below. A large planting container is elevated over the aquarium by two support legs so that the planting container is larger than the aquarium. The support legs can be used to hide wires or control boxes, along with using the legs as storage compartments or additional planting area. An aquarium pump delivers water to the planting container so that fish waste can be used as nutrients for plants in the container. The nitrogen cycle transforms the fish waste into useable nutrients for the plants, thus cleaning the water for the aquarium. The system can be used as a learning tool for students of all ages. It also creates a low maintenance, self-watering and self-fertilizing garden.

The invention discloses urban organic waste pyrolytic biochar, a soil conditioner and a use method of the soil conditioner. Paper waste, rubber and plastic waste, fabric waste, bamboo waste and kitchen waste of urban organic waste are selected as raw materials, the raw materials including, in parts by weight, 1-1.5 parts of paper waste, 2-2.5 parts of rubber and plastic waste, 0.5-1 part of fabric waste, 0.5-1 part of bamboo waste and 5-5.5 parts of kitchen waste are uniformly mixed, inorganic components are removed, dried and smashed and subjected to high-temperature pyrolysis, and the urban organic waste pyrolytic biochar is obtained. According to the soil conditioner, the urban organic waste pyrolytic biochar is taken as an effective ingredient and added to the soil during use in the mass ratio being 2%-4%. The urban organic waste pyrolytic biochar has the characteristics of rich sources of the raw materials, low cost and simple process; the urban and rural environments can be improved, and reduction, reutilization and harmless utilization of urban organic waste are realized; besides, nitrogen cycle of soil can be accelerated, and a theoretical direction is provided for improvement of the agricultural soil environment.

The invention refers to a kind of gas flow drying and ebullated bed drying method with nitrogen circulation for project plastic-ABS. gas flow and ebullated bed drying technology, it adds in nitrogen circulation system, gas washing, dehumidification, temperature dividing craft; designs the circulation use of the washing detergent and the reclamation of ABS power, thus realizes a reliable drying method.

The invention belongs to the technical field of ambient air sampling devices, and particularly relates to a sampling tank for storing ambient air samples. The sampling tank is of an integrated sphere structure; a gas port and a valve corresponding to the gas port are arranged at the upper part of the sampling tank; a layer of silicon film is plated on the inner wall of the tank body, and the film plating method comprises the following steps: (1) vacuumizing the sampling tank, filling nitrogen, and repeating until the nitrogen content accounts for 99% or above; (2) filling high-temperature hydrogen until the hydrogen content accounts for 99% or above in the same way as that in the step (1); and (3) filling the treated tank body with high-temperature silane until a silicon film with the thickness of more than 200nm is formed on the inner wall of the tank body. The sampling tank provided by the invention adopts the specific silicon film layer which is subjected to passivation treatment, and the silicon film layer is high in passivation inertness and is suitable for storage of air samples containing sulfur and bromine components; the samples are not adsorbed in the tank body and the valve, so that the accuracy of the result is ensured; and the sampling tank is suitable for collecting various ambient air samples and is wide in application range.

The invention relates to a device and method for preparing krypton-xenon concentrate in liquid oxygen. The device comprises a liquid oxygen pump, a rectification tower, a main heat exchanger, a condensing evaporator, a nitrogen circulation compressor and a low temperature adsorber, and the concentration method comprises the steps: (1), adopting the liquid oxygen pump to pressurize the liquid oxygen generated after air separation, and then inputting the pressurized liquid oxygen into the low temperature adsorber through a pipeline for impurity removal treatment; (2), inputting the liquid oxygenobtained after the impurity removal treatment into the middle part of the rectification tower through a pipeline for rectification concentration, wherein rectification concentration includes evaporation and condensation, both a heat source of evaporation and a cold source of condensation are supplied through nitrogen cycle conversion; and (3), discharging the krypton-xenon concentrate in the liquid oxygen obtained after rectification concentration from a krypton-xenon concentrate outlet at the bottom of the rectification tower. The method has the advantages of a simple process, high safety, low cost and low energy consumption, and supply of liquid nitrogen, supply of liquid oxygen or simultaneous production of liquid nitrogen and liquid oxygen can be performed according to customer needswhile the krypton-xenon concentrate is produced.