72 results about "Ammonia emission" patented technology

The invention discloses a composite microecological preparation as well as a preparation method and application thereof. The compound microecological preparation disclosed by the invention comprises lactobacillus casei, lactobacillus plantarum and saccharomyces cerevisiae. The application effect of the composite microecological preparation in cow breeding is remarkable, the optimal addition amount of the composite microecological preparation is 100 mL / cow / day, the production performance of lactating cows can be improved, the milk yield is improved by 3.30 kg / cow / day, the milk yield of 4% standard milk is improved by 3.78 kg / cow / day, the total protein is improved by 15.9%, the albumin is improved by 14.7%, the globulin is improved by 16.5%, and the somatic cell number is reduced by 52.6%; and pollutant emission can be reduced, including 37.2% of ammonia emission reduction and 28.7% of carbon dioxide emission reduction.

The invention discloses an in-cylinder combustion process and chemical reaction mechanism-based hydrogen ammonia emission generation prediction system and method, and relates to the technical field of hydrogen internal combustion engine tail gas emission control, and the system comprises an input variable acquisition module, a combustion simulation module, a chemical reaction simulation module, an emission generation prediction module and an output interface module; according to the method, a mechanism-driven multi-physics field coupling prediction system is constructed, the simplified assumption limitation of a traditional empirical model is broken through, high-precision dynamic analysis of the emission characteristics of the hydrogen-ammonia engine is achieved, in combustion process simulation, in-cylinder turbulence mixing and flame propagation details are accurately described by using a CFD model, and in-cylinder combustion simulation is achieved. The chemical reaction module can significantly improve the prediction credibility of unburned fuel residues and pollutant generation through sensitivity analysis and mechanism optimization, in addition, through real-time coupling sensor data and simulation calculation, the abnormal emission trend can be pre-judged in advance, and a feedforward control basis is provided for the ammonia injection amount, the EGR rate and the ignition angle.

This invention relates to the field of wastewater treatment technology and discloses a method for controlling ammonia emission reduction and stabilization during the storage and fermentation of a fecal-water mixture. This method addresses the problem in traditional methods of achieving coordinated control of ammonia volatilization inhibition and stabilization during the storage and fermentation process of a fecal-water mixture with continuously fluctuating composition and fermentation activity. The method first divides the incoming materials into batches and identifies their state to determine the volatilization risk state and fermentation acceptance state. During the storage stage, it performs graded control, continuous verification, and activity recovery treatment. After meeting the transition conditions, it implements fermentation transition control. During the fermentation stage, it sequentially performs stabilization advancement, stabilization control, and abnormal regression treatment, thereby achieving coordinated control of ammonia volatilization inhibition and stabilization during the storage and fermentation of the fecal-water mixture.

The invention discloses a continuous feeding type ammonia reducing-nitrogen preserving-maturing promoting composting reactor and method, and belongs to the technical field of organic solid waste resourceful treatment and environmental engineering. The device adopts a mode of'four-zone sectional treatment + internal odor circulation + water vapor / ammonia gas management + adaptive aeration control 'to realize continuous feeding, zone synergistic fermentation and efficient nitrogen interception. The reactor integrates an ammonia gas and odor reduction unit in which electrodes assist microorganisms, a circulating pump drives gas to flow back, and a selective membrane is combined with activated carbon, and an aeration regulation and control system based on oxygen concentration feedback. And when a fermentation period is completed in about 20 days, ammonia emission and nitrogen loss are effectively reduced, decomposition is promoted, the quality of a compost product is improved, and the engineering value capable of being amplified and applied is achieved.

The invention relates to the field of environmental microbial technology and agricultural waste recycling, in particular to paracoccus pantotrophus and a microbial agent and application thereof. The strain is Paracoccus pantotrophus XDF08, and is preserved in the China General Microbiological Culture Collection Center, called CGMCC for short, the preservation address is Institute of Microbiology, Chinese Academy of Sciences, No.3, No.1 Yard, Beichen West Road, Chaoyang District, Beijing, the preservation date is July 14, 2025, and the preservation number is CGMCC NO. 35225. The invention further discloses a preparation method of the paracoccus pantotrophus XDF08. The strain and the microbial inoculum thereof are applied to the composting process of agricultural wastes, can achieve the dual goals of reducing ammonia emission from the source and improving the quality of compost products, and have the advantages of low cost, simplicity and convenience in operation, greenness, environmental protection and the like.

The present application relates to the technical field of agricultural breeding, and discloses a large-scale cage feeding method for low-nitrogen emission broiler chickens, which comprises a nutrition regulation module, a feeding environment management module, a harmless and resourceful treatment module for manure, and an intelligent monitoring module. The present application constructs a whole-chain low-nitrogen emission system from "feed source, feeding process, and end treatment". This systematic integration ensures that nitrogen is effectively controlled at each link, and minimizes ammonia emission and nitrogen pollution. The present application directly reduces about 15-20% of nitrogen intake and excretion by using low-protein daily feed and precise amino acid balance. In combination with the inhibition of urease by additives such as yucca extract, the purpose of controlling ammonia pollution from the source is achieved.

The present application relates to a method for preparing organic soil by geopolymer KETOS and excrement biogas residue, and belongs to the technical field of agricultural soil repair and organic waste resource utilization. The method uses geopolymer KETOS with three-dimensional network inorganic framework and multi-stage interconnected pore structure as a porous mineral framework carrier, mixes it with livestock and poultry excrement and biogas residue, and carries out aerobic combined composting, so that organic matter and microorganisms are colonized in the pores of the geopolymer KETOS, forming functional organic soil with inorganic, organic and biological composite structure. The present application synchronously solves the two difficult problems of organic waste treatment and soil structure improvement, shortens the composting period by 30% to 50%, reduces ammonia emission by more than 60%, increases water retention rate by 60% to 120%, and the obtained product has multiple functions such as long-acting soil improvement, water and fertilizer retention, nutrient slow release, etc., can replace traditional materials such as vermiculite and perlite, and has wide application prospect.

The present invention relates to a composition comprising platinum supported on titanium oxide, the platinum particles having an average particle diameter of 50-200 nm. The composition has a surprisingly low light-off temperature for the ammonia oxidation and a high selectivity for oxidation to N2.

The invention belongs to the technical field of vehicle detection, and discloses a vehicle ammonia escape online detection method, system and terminal based on big data. The method comprises the following steps: acquiring real-time data of ammonia emission concentration, identifying ammonia escape peak value concentration from the real-time data, and outputting a starting time point corresponding to the ammonia escape peak value concentration; based on the starting time point, an inspection period including a first inspection period and a second inspection period is set, the first inspection period is corrected to determine a first correction period, and a second correction period is determined based on the second inspection period. According to the method, discontinuous accidental ammonia escape caused by instantaneous fluctuation of the sensor or environmental interference is filtered out, so that an isolated and irregular data peak is prevented from being misjudged as a real ammonia escape event.

The present application belongs to the technical field of poultry and livestock breeding, and relates to a poultry and livestock breeding method for reducing ammonia emission; the method comprises the following steps: laying a three-layer composite bedding material composed of a biological activation layer, an acid-base buffer layer and a basic adsorption layer before poultry and livestock enter a house, and continuously and stably reducing ammonia emission through the synergistic effect of physical adsorption, chemical neutralization and biological degradation; daily feeding of special ammonia-reducing feed containing composite plant extract, polysaccharide enzyme preparation and urease inhibitor to reduce the excretion of nitrogen-containing substances in feces from the source; spraying of a composite ammonia-removing agent according to the ammonia concentration gradient in the house to achieve precise control; mixing of feces and bedding material after poultry and livestock defecate, and supplement of ammonia adsorbent, so that the old bedding material can be composted into organic fertilizer. The present application constructs a whole-chain ammonia emission reduction system of'source control-process blocking-end conversion', effectively realizes long-term and stable control of the ammonia concentration in the poultry house, and improves the breeding environment.

This document relates to a vent gas treatment system for ammonia-propelled vessels. The proposed vent gas treatment system includes a vent gas treatment facility configured to recover and treat ammonia discharged from an ammonia fuel consumer or an intermediate facility supplying ammonia fuel to the consumer; a wastewater tank for storing ammonia water discharged from the vent gas treatment facility; and gas piping for returning the ammonia gas generated in the tank back to the vent gas treatment facility. This system efficiently addresses not only the discharge of ammonia water but also the problem of ammonia gas in the tank storing the ammonia water.

This invention belongs to the field of exhaust gas monitoring technology and discloses a device and method for measuring ammonia emissions from an ammonia-hydrogen fuel cell engine. The device includes a high-efficiency filter and an engine. The high-efficiency filter is connected to an air heater. A first sampler is provided at the outlet of the air heater. The air heater and the engine are connected to a heating and mixing chamber. The heating and mixing chamber is connected to a dilution channel. The dilution channel is connected to a fan through a critical venturi tube. A sensor and a second sampler are provided in the dilution channel. The second sampler and the first sampler are connected to an analyzer. The analyzer and the sensor are connected to a computer. The method includes S1: connecting the measuring device; S2: preparation before measurement; S3: starting the measurement and acquiring parameters; S4: calculating the power-based emission factor of pollutants. This invention solves the problem of inaccurate measurement of ammonia emissions from engines in existing technologies and is applicable to exhaust gas measurement.

The invention relates to an acidifying agent for reducing ammonia emission through storage and fermentation of pig manure water and application of the acidifying agent. The acidifying agent is prepared from ardealite, ferrous sulfate and thermally activated natural starch according to the mass ratio of 3: 3: 4. The acidifying agent comprises the following elements in percentage by weight: 37.2% of C, 5.8% of H, 46.7% of O, 3.5% of Fe, 2.6% of P and 4.2% of S. According to the invention, the industrial waste phosphogypsum is subjected to resource utilization, so that resource waste is reduced; meanwhile, the acidifying agent takes inorganic acid as a crystal nucleus and a macromolecular organic carbon chain as a framework, a macromolecular organic-inorganic composite acidification system is built, after addition, the pH of a fermentation system can be rapidly reduced, the activity of microorganisms in the system is regulated and controlled, the synergistic effect of the acidifying agent and microbial acidification is achieved, the acidification efficiency is improved, and the acidifying effect is improved. The low pH can be effectively kept for a long time, and rapid and continuous storage, fermentation and acidification of the pig manure water are achieved.

This invention relates to a flexible ammonia sensor, its preparation method, and its application. The preparation method includes: S1: reacting Ti3C2T... x Calcination yields TiO2@Ti3C2T x S2: Apply TiO2@Ti3C2T x A first mixed solution is prepared by mixing aniline monomer with HCl; a second mixed solution is prepared by mixing aniline monomer with HCl; and a third mixed solution is prepared by mixing ammonium persulfate with HCl. S3: A polyimide film is immersed in the first mixed solution, and the third mixed solution is added to the second mixed solution to prepare a fourth mixed solution. S4: The fourth mixed solution is added to the first mixed solution to react and obtain a flexible ammonia sensor. The flexible ammonia sensor is prepared using the above method. The application is in real-time monitoring of ammonia emissions from high-humidity agricultural soils. The flexible ammonia sensor of this invention has high sensitivity at room temperature and excellent resistance to moisture interference and mechanical bending resistance.

This application belongs to the field of ammonia treatment technology, specifically disclosing an ammonia treatment system, which includes a spraying mechanism and a circulating cooling mechanism. The spraying mechanism includes a spray tower, spray pipes, and an air inlet pipe. The water outlet of the spray pipe and the air outlet of the air inlet pipe are both connected to the interior of the spray tower, and the water outlet of the spray pipe is located above the air outlet of the air inlet pipe. The circulating cooling mechanism includes a guide pipe, a circulating water tank, a circulating water pipe, a delivery pump, and cooling components. The water inlet of the guide pipe is connected to the bottom end of the spray tower, and the water outlet is connected to the circulating water tank. The water inlet of the circulating water pipe is connected to the bottom end of the circulating water tank, and the water outlet is connected to the water inlet of the spray pipe. The delivery pump is installed on the circulating water pipe. Through the structural design of this application, the spray water can be continuously cooled, thereby ensuring the high efficiency of ammonia treatment, reducing ammonia emissions, reducing the risk of environmental pollution, and simultaneously realizing the recycling and reuse of spray water, reducing water waste.

The invention relates to a monitoring arrangement and a monitoring method capable of monitoring a plant (LB, LB') for ammonia emissions. The monitoring arrangement comprises at least one monitoring unit (Üe.1, Üe.2) and a central computer (3). A predetermined upper limit for the ammonia emissions of the plant (LB, LB') is stored in a data memory (14, 14') of the monitoring unit (Üe.1, Üe.2). An ammonia sensor (1.01, 1.02, 1'.01, 1'.02) of the monitoring unit (Üe.1, Üe.2) measures the ammonia content in an emitted gas mixture. A communication unit (2, 2') of the monitoring unit (Üe.1, Üe.2) generates a message that includes the stored upper limit and the measured ammonia content(s). This message is transmitted to the central computer (3). An evaluation unit (8, 8.1) of the central computer (3) decides whether the actual ammonia emissions of the plant (LB, LB') are below the transmitted upper limit or not.

The invention relates to the technical field of sewage treatment, and provides a livestock and poultry liquid manure storage treatment device and a treatment method.The device comprises an acidification pool used for adding an acidifying agent, the acidification pool is used for acidifying livestock and poultry liquid manure, and after the acidified livestock and poultry liquid manure is precipitated, first treatment liquid is obtained; a micro-aerobic aeration unit is arranged in the micro-aerobic aeration tank, and the micro-aerobic aeration tank is used for micro-aerobic aeration of the first treatment liquid. The covering device is used for covering the livestock and poultry liquid manure in the precipitation process and the first treatment liquid in the micro-aerobic aeration process. According to the storage treatment device and treatment method suitable for the livestock and poultry liquid feces, emission reduction of ammonia and greenhouse gas is achieved through the acidification technology, the storage treatment efficiency is improved through the micro-aerobic technology, and meanwhile initial ammonia emission increase caused by the storage process and micro-aerobic aeration can be reduced through the adsorption effect of straw of the covering device.

The application discloses a high-efficiency ammonia-assimilating Bacillus compostus and application thereof, and relates to the technical field of microorganisms. Bacillus stercoris The strain is QY6, which has been preserved in the China General Microbiological Culture Collection Center (No. 3, Beichen West Road, Chaoyang District, Beijing) on December 23, 2024, with a preservation number of CGMCC No. 33139. The strain or a biological bacterial agent prepared from the strain can be used for composting of organic solid waste, so that ammonia emission can be significantly reduced; the composting product can be applied to soil, so that the contents of soil available nitrogen, organic matter and humic acid can be significantly increased; and the product can be used for cultivation of Chinese cabbage, so that the fresh weight can be significantly increased and the content of soluble sugar can be increased. The application provides a high-efficiency nitrogen-preserving and decay-promoting microbial strain, which can be used in the fields of agricultural waste resource utilization, composting quality improvement and efficiency enhancement and agricultural planting.

The utility model discloses a desulfurization and denitrification device for treating diketene cracking tail gas, and belongs to the technical field of desulfurization and denitrification. A desulfurization and denitrification device for diketene cracking tail gas treatment comprises a fixing table, a controller is arranged on the outer wall of the fixing table, a regeneration reaction tank and a liquid ammonia storage tank are arranged on the outer wall of the fixing table, a desulfurization assembly and a denitrification assembly comprise a desulfurization tank and a denitrification tank correspondingly, and the output end of a rotating motor extends into a mounting cylinder and then is connected with a transmission rod. According to the device, the desulfurization effect is more uniform and effective, the time required for desulfurization can be effectively shortened, the desulfurization effect is more sufficient, ammonia gas is released from the plurality of stirring rods, so that the ammonia gas can be ensured to be discharged more uniformly in the stirring process, the ammonia gas and tail gas can be mixed more conveniently, and the desulfurization effect is improved. The denitration reaction efficiency and effect of the tail gas are effectively improved.

This invention provides an animal feed prepared using microbial fermentation products and its preparation method. By constructing a symbiotic community of anaerobic ammonia-oxidizing bacteria and Clostridium butyricum, and combining it with livestock and poultry manure biochar as a fixation carrier and a complex enzyme system, the protein degradation and nitrogen emission control of ruminant feed are optimized. This method degrades crude protein into small peptides through anaerobic fermentation, while simultaneously converting ammonia nitrogen into nitrogen gas, effectively reducing ammonia emissions by 70%-80%. Furthermore, the use of high-temperature activated biochar as a fixation carrier improves the colonization rate and stability of the microbial community. This invention not only improves the nutrient utilization rate of feed but also solves the problems of high nitrogen emissions and low fiber utilization in traditional feeds, providing a novel solution for low-nitrogen, environmentally friendly ruminant feed.

The invention discloses bacillus mucilaginosus JZ-235 as well as a preparation method, a microbial agent and application thereof, the preservation number of the bacillus mucilaginosus JZ-235 is CGMCC No.32962, the bacillus mucilaginosus JZ-235 has the advantages of high yield of urease and indoleacetic acid, efficient utilization of ammonium nitrogen and no denitrification effect, crop growth can be remarkably promoted, the yield is increased, CO3 < 2-> is generated while nitrogen (NH4 < + >) is provided for crops, and the bacillus mucilaginosus JZ-235 has the advantages of high yield of urease and indoleacetic acid and no denitrification effect. According to the present invention, with the application of the nitrogen fertilizer, the nitrogen fertilizer efficiency can be easily improved, the influence of the ammonia emission on the environment can be reduced, the nitrogen fertilizer efficiency can be easily improved through the growth and the propagation at the crop rhizosphere, the ratio of the non-denitrification functional bacteria in the soil can be increased, the soil denitrification effect can be reduced, and the nitrogen fertilizer efficiency can be improved; therefore, emission of nitrous oxide is reduced, and environmental protection is facilitated.

The invention discloses a method and a system for measuring and calculating ammonia emission of an automobile equipped with TWC post-treatment in a plateau environment. The method comprises the following steps: acquiring different excess air coefficient data, engine load data, automobile acceleration time data, automobile mileage data, altitude data, hydrogen content data in tail gas and corresponding NH3 emission data; calculating the weight of the excess air coefficient according to the excess air coefficient of the mixed gas and the influence function of the engine load and the automobile acceleration time on the excess air coefficient; fitting through a linear regression experiment to obtain an influence function of the driving mileage, the altitude and the hydrogen content in the tail gas of the automobile on NH3 emission; the NH3 instantaneous emission value of each experiment point is calculated and summed, and the basic emission value of NH3 is obtained; calculating an NH3 comprehensive emission value according to the excess air coefficient weight, the automobile driving mileage, the altitude, the influence function of the hydrogen content in the tail gas on NH3 emission and the basic emission value of NH3; and the accuracy and reliability of ammonia emission measurement and calculation of the automobile equipped with TWC post-treatment in the plateau environment can be obviously improved.

The invention provides a hydrogen internal combustion engine hydrogen ammonia emission online virtual sensing method based on a lightweight neural network, and relates to the technical field of vehicle-mounted intelligent sensing and emission control. Comprising four steps of construction of a standardized data set, construction of a lightweight neural network model, deployment and real-time optimization of the model, and output of a real-time emission estimation value. According to the invention, engine operation state data is collected and standardized, a high-quality data set is constructed, and then a lightweight neural network model with a simple structure and small parameter quantity is adopted to efficiently operate in an embedded environment and estimate the concentration of hydrogen and ammonia gas in real time, so that a traditional sensor is replaced to carry out accurate emission prediction. Meanwhile, an online learning mechanism is introduced for real-time optimization, it is ensured that high precision is maintained under different working conditions, the method has the advantages of being low in cost, capable of being embedded, high in precision and the like, the requirement for a traditional sensor is remarkably reduced, and the efficiency and reliability of a vehicle-mounted emission control system are improved.

The application provides an ammonia flare zero emission system and a treatment process, which comprises an ammonia gas conveying main pipe, the ammonia gas conveying main pipe is communicated with each ammonia gas emission device, and further comprises an ammonia gas absorption tower, a liquid inlet of the ammonia gas absorption tower is communicated with a water inlet pipe, a gas inlet is communicated with the ammonia gas conveying main pipe, a spraying assembly for spraying rising ammonia gas is arranged in the top of the ammonia gas absorption tower; a circulating pump inlet is communicated with the bottom of the ammonia gas absorption tower through a pipeline, an outlet pipeline is communicated with the middle part of the ammonia gas absorption tower, the pipeline connected with the circulating pump outlet is further communicated with an ammonia evaporation device, and a valve is arranged on an output main pipe; a propylene cooler is arranged on the pipeline connected with the circulating pump outlet, and the treatment process of the ammonia flare zero emission system is further provided. The ammonia gas emitted by the ammonia flare is treated by using the low-temperature deep absorption, continuous concentration and recovery and upgrading coupling technology, the ammonia gas in the ammonia flare gas is absorbed and concentrated before being combusted by the flare, the concentrated ammonia gas is sent back to the ammonia evaporation device for treatment, and high-quality ammonia water is obtained.

The utility model provides a kind of ship ammonia treatment system, including ammonia emission system, ammonia gas discharge pipeline, liquid ammonia discharge pipeline, liquid ammonia heater, ammonia cracking device and air permeation device, one end of ammonia gas discharge pipeline and one end of liquid ammonia discharge pipeline are connected with ammonia emission system, the other end of ammonia gas discharge pipeline and the other end of liquid ammonia discharge pipeline are connected with the inlet of ammonia cracking device, liquid ammonia heater is set on liquid ammonia discharge pipeline, the outlet of ammonia cracking device is connected with air permeation device.The utility model also provides a kind of ship.

The invention belongs to the technical field of combustion equipment control, and particularly discloses a pulverized coal horizontal boiler detection control system and a use method. The system disclosed by the invention comprises a data acquisition module, a data processing module, a prediction model module, an optimization algorithm module and a system execution and display module. The data acquisition module is used for acquiring operation data of the boiler in real time; the data processing module is used for preprocessing the operation data; the prediction model module is used for outputting predicted values of nitrogen oxide and ammonia gas emission concentration in a future period; the optimization algorithm module is used for calculating optimized boiler operation parameters on line by adopting a particle swarm optimization algorithm; and the system execution and display module is used for controlling the boiler to operate according to the optimized operating parameters and displaying the operating state of the boiler in real time. The intelligent control level and the combustion efficiency of coal and ammonia co-combustion can be improved, and pollutant emission is reduced. The method can be widely applied to coal and ammonia co-combustion control of the pulverized coal boiler.

This invention discloses a low-salt shrimp paste fermentation device and method, relating to the field of shrimp paste preparation technology; it includes a fermentation tank with two layers: an inner insulation layer and an outer protective shell; a connecting structure between the inner and outer layers; a temperature control system; an exhaust pipe; a stirring buoyancy cage, including a horizontally arranged cage body with horizontal shafts at both ends, the horizontal shafts extending out of the insulation layer and connecting to the connecting structure; a stirring body located outside the stirring buoyancy cage, connected to the stirring buoyancy cage; a main bag installed in the stirring buoyancy cage; the main bag is filled with nitrogen gas and has a branch pipe connected to the stirring body; an installation cavity is opened in the stirring body, and an exhaust valve is installed in the installation cavity; an exhaust port is opened on the stirring body, and the end of the branch pipe is connected to the exhaust valve and connected to the exhaust port; a rotating pressing component is installed outside the protective shell to solve the technical problem that ammonia emissions can easily introduce air and bring in contaminants, damaging the fermentation process.

The invention provides a bifunctional catalyst and application thereof, and relates to the technical field of catalysts.The bifunctional catalyst comprises a trapping type carrier and a catalytic coating attached to the trapping type carrier, and the catalytic coating comprises an oxidation function material and a reduction function material; the oxidation function material and the reduction function material are mixed and attached to the same side of the trapping type carrier, or the oxidation function material is attached to the gas inlet end side, and the reduction function material is attached to the gas outlet end side; the oxidation functional material comprises a first carrier and first active metal loaded on the first carrier; and the reducing functional material comprises a second carrier and a second active metal loaded on the second carrier. According to the bifunctional catalyst disclosed by the invention, the ammonia gas conversion function and the particle trapping function are integrated on the same catalytic unit, and the problem of ammonia gas emission is solved while particulate matter trapping is realized, so that the arrangement cost is saved, the back pressure amplification of a finished product catalyst formed by integration is within a reasonable range, and the application requirements are met.

This invention provides a solid dosage product in the form of ammonia gas (NH3) bioadsorbent granules and a method for making it by utilizing the organic acid content of starfruit (Averrhoa bilimbi) extract. This bioadsorbent granule consists of a natural polymer carrier matrix component in the form of a combination of sodium alginate and gelatin composites with a weight ratio of 1:1, and an active substance in the form of starfruit extract of 15% w / w to the total weight of the matrix base. The manufacturing method is carried out through an ionotropic gelation technique by dissolving the polymer matrix, mixing the starfruit extract homogeneously using a magnetic stirrer at a speed of 500 rpm and a temperature of 40oC, then dripping the mixture into a 0.1 M calcium chloride (CaCl2) hardener solution to form a porous solid phase cross-link.Based on FTIR analysis, these granules have active sites in the form of functional groups –OH, C=O, and COO- that capture ammonia gas molecules through acid-base interactions into a stable form of ammonium ions (NH4+) and are strengthened by hydrogen bonds. The application of these granules is able to reduce ammonia gas emissions in open poultry farm waste areas with a reduction efficiency of up to 91.3% or until the ammonia level reaches 0 ppm.

The present invention relates to polypeptide comprising an immunoglobulin single variable domain (ISVD) that specifically binds and inhibits a urease, which ISVD is modified to improve one or more of its protease resistance, thermostability, producibility in microbial hosts and in situ performance in animal excreta. Alone or in combination, the ISVD's of the invention are able to inhibit a broad range of microbial and plant-based ureases. The urease-inhibiting polypeptides of the invention can be used in compositions such as animal feed, animal feed premixes and supplements, to be fed to animals, for reducing the amount of ammonia released from the animal and / or for reducing the amount of ammonia released from the animal's excreta, with the aim to reduce ammonia emissions from agriculture into atmosphere and / or ecosystems. In addition, in the polypeptides can be used in an environmental application like stable floors, slurry pits and urea-based fertilizers for reducing the emission of ammonia.