25 results about "Dissolved organic carbon" patented technology

The invention discloses a preparation method of modified salicornia biochar, and belongs to the technical field of environmental protection. The preparation method comprises the following steps: washing, drying and crushing salicornia europaea serving as a raw material, mixing the salicornia europaea with a nitrogen source modifier according to a certain mass ratio, adding water, uniformly stirring, dipping and drying; the nitrogen source modifier is one or more of urea, melamine or thiourea; then carrying out pyrolysis and carbonization, grinding, washing and drying the obtained carbon material, and finally preparing the modified salicornia biochar. The prepared modified salicornia biochar is used for adsorbing organic matters in sewage or wastewater, can effectively remove dissolved organic carbon (DOC, 86.34%), UV254 (89.33%) and chromaticity (CN, 94.74%) in an adsorption experiment of livestock and poultry biogas slurry, and shows excellent adsorption performance. The method follows the principle of treating waste with waste, the salicornia europaea waste is effectively treated, the obtained biochar has good application potential in the aspect of sewage and wastewater treatment, and high-value utilization of the waste is achieved.

The invention discloses a preparation method of modified apocynum venetum charcoal. The preparation method comprises the following steps: flushing apocynum venetum, drying, crushing and sieving; adding water, uniformly mixing the apocynum venetum powder with a composite modifier, and drying, wherein the composite modifier comprises a urea, sodium carbonate and ferric salt ternary system; and then carrying out pyrolysis. The obtained modified apocynum venetum charcoal is applied to adsorption of organic matters in sewage or wastewater treatment. Adsorption experiments are carried out on livestock and poultry biogas slurry, after 48 hours, the removal rate of the modified apocynum venetum charcoal adsorbent on soluble organic carbon in biogas slurry wastewater is 57.42%, the removal rate of UV254 is 75.90%, the removal rate of chromaticity is 78.64%, and the modified apocynum venetum charcoal adsorbent shows excellent adsorption performance and can be used as a good adsorbent for removing organic pollutants in water treatment. According to the method, circular economy and the idea of treating waste with waste are taken as basic principles, so that the apocynum venetum waste is treated, and the obtained apocynum venetum biochar can effectively treat organic matters in wastewater and meet the treatment requirements of various types of wastewater.

There is described a system and method for measuring properties of water, such as surface water at site. That site may be in an agricultural setting. The properties of water, such as surface water may include nitrates and / or dissolved organic carbons. An example system may comprise a light source configured to emit a broadband source signal comprising a particular bandwidth for use in measuring a range of particular properties of water as well as an optical device configure to split the source signal into a measurement signal, and a corresponding reference signal. The system may also comprise a sensor unit configured to communicate a measurement signal through water at the sensor unit (e.g., when located in a stream), and a spectrometer configured to receive both a measurement signal having been communicated through water at the sensor unit and a reference signal from the optical device. Such a spectrometer may be configured to separate received measurement signals and reference signals into common component wavelengths, those common component wavelengths being associated with expected properties of water; and the system may be further configured to use respective component wavelengths of a measurement signal together with those of a reference signal to determine one or more particular properties of measured water.

The invention provides comamonas and application thereof in removing soluble organic carbon, and relates to the technical field of sewage treatment. The Comamonas sp. WN2 strain disclosed by the invention is preserved in the Guangdong Microbial Culture Collection Center (GDMCC), and the preservation number is GDMCC NO. 64336. The Comamonas sp. WN2 strain disclosed by the invention has the advantages that the Comamonas sp. The comamonas strain WN2 provided by the invention has efficient organic carbon degradation capability, and can significantly reduce the total organic carbon and chemical oxygen demand level of a water body. The biological membrane generated on the basis of the comamonas strain WN2 is used for sewage treatment, so that the technical effects of improving the sewage treatment efficiency and effectively reducing the operation cost are achieved.

The present invention provides a system and a method for generating water-based super vapor or gas by extracting dissolved organic carbon, DOC from liquid sources. The method involves introducing a liquid containing DOC into a cavitation chamber and applying a piezoelectric effect to induce micro-cavitation through ultrasonic waves. The method creates alternating high-pressure and low-pressure cycles that form and collapse micro-cavitation bubbles, releasing localized energy that breaks down DOC into smaller molecules and gases. Environmental air may be introduced to aid in bubble rupture and gas release. The present system comprises a piezoelectric transducer, wave generator, cavitation chamber, and control unit. The present invention provides an efficient, cost-effective solution for DOC extraction and conversion, enhancing waste management and resource recovery.

This invention relates to the field of wetland ecological environment monitoring and greenhouse gas emission reduction technology, specifically to a method for assessing the impact of microplastics on methane emissions from wetland soils based on soil carbon composition. This invention assesses the degree of change in methane emissions from wetland soils after the addition of microplastics by measuring changes in the content of organic carbon components in the soil. Results show that, without relying on the detection of functional genes such as methanogens and methanogens, changes in the content of only two key carbon components—dissolved organic carbon and mineral-bound organic carbon—can accurately and quickly assess the direction and intensity of the impact of microplastics on methane emissions from wetland soils. This demonstrates the feasibility, scientific validity, and practicality of the method, providing a simple, efficient, and easily scalable new approach for assessing methane emissions from greenhouse gases under microplastic pollution stress in ecosystems.

The invention belongs to the technical field of soil sample treatment equipment, and particularly relates to a soil sample inorganic carbon removal device which comprises an outer machine body and a control unit, the outer machine body is divided into an upper cavity and a lower cavity through an isolation layer, a pickling assembly is installed in the upper cavity, and a flushing assembly is installed in the lower cavity; the pickling assembly comprises a reaction unit and an adding unit, the reaction unit comprises a base platform, a clamping platform is installed on the base platform, a washing barrel is slidably clamped on the clamping platform, a cup opening corresponds to the washing barrel after the material cup rotates and topples over, a second air cylinder is installed in the base platform, a connecting rod is installed on a driving rod of the second air cylinder, and a transfer barrel is installed on the connecting rod; the upper end of the transfer cylinder is matched with the cover ring, the flushing assembly is used for adding UP water into the flushing cylinder, and the problems that the number of steps is large, time is long when a soil sample is treated at present, meanwhile, small soil particles and soluble organic carbon are likely to be eluted in the operation process through manual operation, and the subsequent detection result is affected are solved.

A known method for producing an algae lysis water concentration mixture for dosing into raw water to obtain test water for testing a water treatment plant, whereby an organic load of a natural body of water is simulated, comprises the following steps: a) Formation of an algae-water concentration mixture from Chlorella vulgaris algae contained in water, b) Lysis of Chlorella vulgaris algae using ultrasound. The following feature takes into account high reproducibility with simple manufacturing: c) The lysis of the Chlorella vulgaris algae is carried out for a lysis period until the value of dissolved organic carbon, hereinafter referred to as DOC (dissolved organic carbon) value, has reached its maximum. It should be added: The algae are Chlorella Vulgaris from sterile and fermentative cultivation of high cell density. Furthermore, the algae lysis water concentrate can also be used to produce the test water after deep freezing.

This invention relates to the fields of ecological science and soil carbon sequestration technology, specifically to a method for promoting soil carbon sequestration using calcium ions and biochar. The method comprises the following steps: pre-culturing soil under sealed, light-protected conditions for 6-10 days; adding biochar and a calcium source to the pre-cultured soil; mixing thoroughly; and then formally culturing under the same conditions as the pre-culture for 50-70 days. This invention introduces calcium ions into biochar. Calcium ions, through cation bridging and inorganic cementation, significantly promote the formation of large soil aggregates and substantially increase the saturated adsorption capacity and affinity of biochar for dissolved organic carbon, thereby effectively reducing the risk of mineralization loss of organic carbon in the soil. This method is simple to operate and low in cost, providing effective technical support for overcoming the bottleneck of soil carbon sequestration using biochar and improving the application benefits of biochar.

Method for producing an algae lysis water concentration mixture for dosing into raw water to obtain test water for testing a water treatment plant, simulating the organic load of a natural body of water, comprising the following steps: a) Formation of an algae-water concentration mixture from Chlorella vulgaris algae contained in water, b) Lysis of Chlorella vulgaris algae using ultrasound, characterized by the fact that c) the formation of an algae-water concentration mixture from Chlorella vulgaris algae contained in water is carried out in such a way that Chlorella vulgaris algae cultivated in fermenters with a cell density of higher than 2*10^9 cell / ml are used, d) the lysis of the Chlorella vulgaris algae is carried out for such a long lysis period that the value of dissolved organic carbon reaches its maximum, e) that the lysis time is determined by preliminary tests.

The invention provides a dynamic simulation method for a seaweed culture water environment in an open sea area, which comprises the following steps of: arranging a plurality of space observation points at a seaweed culture bay, and acquiring seawater salinity, actually measured concentration of dissolved organic carbon and geographical location information of each observation point; based on two-end-member mixed analysis of a fresh water end member and a seawater end member, constructing a hydrological background correction model, and calculating the conservative mixed concentration of dissolved organic carbon at each observation point; constructing a two-dimensional hydrodynamic exchange model, simulating a bay water body flow and exchange process, and outputting water body half-exchange time and daily average water body exchange flow of each observation point; coupling the hydrological background correction model and the hydrodynamic force exchange model, and calculating the net flux of the dissolved organic carbon of the algae source at each observation point in combination with the actually measured concentration of the dissolved organic carbon at each observation point; constructing a coupling model of algae growth and dissolved organic carbon release based on the net flux of algae source dissolved organic carbon at different culture time; the simulation and prediction of the net flux of the dissolved organic carbon of the gulf algae source along with the culture time change are realized.

The application discloses a new reclaimed soil exogenous carbon precise application method based on fluorescence spectrum technology, relates to the technical field of soil improvement, and specifically comprises the following steps: (1) soil background carbon activity diagnosis: collecting a new reclaimed farmland soil sample, extracting DOM in the soil, obtaining the fluorescence integral area of five characteristic peak regions through three-dimensional fluorescence spectrum scanning, calculating fluorescence parameters FI, BIX and HIX according to the proportion, and evaluating the soil carbon stability and activity short board through the fluorescence parameters; (2) exogenous carbon material screening model construction: establishing a mapping relationship between fluorescence characteristic parameters and carbon function demand; and (3) precise addition and effect verification: dynamically adjusting the types and proportions of exogenous carbon according to the diagnosis result. The application determines the soil dissolved organic carbon components through fluorescence spectrum measurement, reflects the soil carbon pool difference between the new reclaimed farmland and the mature farmland through fluorescence component analysis, selects appropriate organic material addition, and achieves the purpose of rapid composting of the new reclaimed farmland.

The invention relates to a coastal crab, shrimp and shellfish polyculture pond carbon footprint accounting method based on a culture period, and the method comprises the following steps: 1, determining a system boundary based on a culture period and a non-culture period, and the system boundary comprises a first-stage boundary and a second-stage boundary; the first-level boundary is a pond native ecosystem and covers greenhouse gas exchange flux of a water-gas interface and a soil-gas interface, stable carbon burial in sediments, carbon transfer of cultured organism biomass and form transformation and fate of inert dissolved organic carbon and dissolved inorganic carbon in a water body. According to the method, the whole-year net carbon footprint of the breeding system is accurately and completely evaluated by constructing the boundary of the whole-carbon library system, distinguishing the breeding period from the non-breeding period and integrating direct flux measurement, life cycle indirect emission accounting and quantification of various carbon sink mechanisms.

The application discloses a river organic carbon flux inversion method based on multi-source data and related equipment, and the method comprises the following steps: acquiring multi-source data of a river basin range in a target research area; converting remote sensing images to obtain a normalized difference index; processing the normalized difference water body index and the multi-source data to obtain river parameters of the target research area, and converting the river parameters through a hydraulic geometric relationship to obtain river runoff; based on remote sensing images, a normalized difference chlorophyll index and a normalized difference turbidity index, using a first inversion model to obtain a particulate organic carbon concentration; based on the population quantity and the rainfall, using a second inversion model to obtain a dissolved organic carbon concentration; and converting the river runoff, the particulate organic carbon concentration and the dissolved organic carbon concentration to obtain the river organic carbon flux. The application can significantly improve the accuracy and reliability of monitoring on a high dynamic river, accurately realize river organic carbon flux inversion, and can be widely applied to the technical field of data processing.

The invention discloses a method for testing the content of carbon isotopes in a low-concentration dissolved organic carbon water sample and a cold trap sample introduction front end, and belongs to the technical field of testing of the content of organic carbon in a water body, and the method comprises the following steps: (1) carrying out sample collection on a low-concentration water body, and carrying out ultrafiltration concentration on the collected water body sample to increase the DOC concentration in the concentrated water body, a concentrated water body sample is obtained; (2) absorbing the concentrated water body sample by using kaolin, and repeatedly coating the dried kaolin sample for multiple times to obtain a plurality of small kaolin samples with the same weight; (3) calculating the number of times of combustion sample introduction according to the CO2 concentration of the sample in the pre-test, collecting the sample gas for multiple times by using a cold trap sample introduction front end, and testing the carbon isotope of the sample; and (4) calibrating the test data of the carbon isotope, determining the delta 13CDOC in the water body, and completing the test. The method can solve the problems of high test cost, poor test accuracy and low test efficiency when the delta 13CDOC in the low-concentration water body is measured in the prior art.

The invention relates to a method for building an offshore granary by using carbon dioxide to culture fishes and sealing and storing carbon dioxide, which is mainly realized through an artificial natural fishing ground and annular fish captivity equipment arranged in the artificial natural fishing ground. The method comprises the following steps of: inputting a nutrient source outside a euphotic layer to the euphotic layer through a transmission pipeline system by utilizing offshore wind power as an energy source; according to the invention, the growth of the seaweeds has an incremental nutrient source, so that the marine organisms of the whole food chain can eat well, more natural fishes can be produced, and more carbon dioxide can be consumed; an attachment inhabiting facility capable of forming marine organisms with a large surface area is designed, so that an enough attachment foundation is provided for incremental miniature algae for attachment life; inert dissolved organic carbon can be generated in the ecological process of marine organisms and can be sealed in seawater for more than 5000 years, and incremental'inert dissolved organic carbon 'can be generated in incremental growth of the marine organisms.

This invention relates to a method for in-situ enhancement of humic components in paddy field surface soil driven by periwinkle organisms. The method includes: crushing rice straw and soaking it in a periwinkle organism culture medium for a predetermined time; drying the soaked rice straw and spreading it on the paddy field surface after rice transplanting; controlling the light conditions on the field surface and implementing periodic short-term drying management during the rice tillering to booting stage. This invention utilizes an adsorbent straw-induced matrix to induce the rapid and directional colonization of periwinkle organisms, an aggregate of indigenous microorganisms at the paddy field soil-water interface, in situ, rather than exogenously adding microorganisms. This method offers high ecological safety and can simultaneously increase the content of humus, total organic carbon, and dissolved organic carbon in the paddy field surface soil within a single rice growing season. The method is simple to operate and suitable for large-scale application.

The invention relates to the technical field of soil pollution monitoring and analysis, in particular to a soil environment pollution condition monitoring and analysis system and method.The system comprises a soil environment sampling module, a sample pretreatment module, a pollution risk multi-dimensional pre-judgment module and a regulation and control scheme analysis module; the optimal sampling scheme is evaluated by collecting three types of parameters of fiber length in a matrix, particle sizes of inorganic particles and organic particles and crop root spacing, the matching of a sampler and soil structure characteristics is realized, and the selective removal of organic matters is realized by adopting a two-step method of alkaline depolymerization and targeted enzymolysis. The conductivity change rate and the residual organic carbon content are used as control indexes, the pretreatment precision is improved, the rhizosphere influence index is calculated by combining the sample conductivity, the porosity and the soluble organic carbon content, the rhizosphere layer and the non-rhizosphere layer are automatically distinguished, the diffusion flux and the absorption flux are synthesized to construct the pollution risk index, and a regulation and control scheme is matched based on the risk level.

The present invention is directed to a dissolved gas flotation unit for cleaning and purifying water by removing suspended solids and dissolved organic carbon (DOC) from water, such as drinking water and wastewater, the device being essentially made of a dissolved gas flotation unit, the gas being a mixture of ozone and air or oxygen (ozonated air or ozonated oxygen), comprising a contact tank for oxidating organic matter and forming agglomerates and flocs thanks to the presence of gas microbubbles, also comprising a flotation zone having a lamella pack and a treated water collection means below which creates a uniform water flow distribution in the flotation zone and through the entire lamella pack, in such a way than it can operate at high hydraulic loading rates or velocities. The flotation unit may also comprise a cleaning system to eliminate clogging and accumulation of solids in the lamella pack and in the treated water collection device. The invention also discloses the method for treating water.

The invention provides a system and a method for measuring the reserve of algae source dissolved organic carbon released by large algae culture. The system comprises an algae culture support module, a DOC in-situ ultraviolet monitoring matrix module and a DOC reserve accounting module, seawater flow exchange is regulated and controlled through the algae culture support module, and algae granular carbon is removed through the DOC in-situ ultraviolet monitoring matrix module; according to the method, indoor raft cultivation and background interference elimination of the macroalgae are carried out, meanwhile, the DOC content of an algae source is rapidly and automatically monitored by applying a DOC ultraviolet in-situ monitoring matrix, automatic collection is carried out through a DOC reserve accounting module, a metering model is formed to measure the DOC reserve change of the algae source, and indoor simulated raft cultivation of the macroalgae and rapid and accurate metering of the DOC carbon reserve of the algae source are achieved. The method is used for quantitative determination of the algae source DOC reserves released by macroalgae indoor raft culture, and has guiding significance for evaluation of the contribution of the algae source DOC carbon reserves released by macroalgae culture.

A method for real-time determining a concentration level of nitrate in a water sample collected from soil at a given site, the water sample contains an unknown composition and unknown concentration of DOC, the method includes: (A) during an offline stage: (a.1) obtaining a testing sample from the soil; (a.2) determining first and second wavelengths correlated, respectively, to concentration levels of the DOC and nitrate in the testing sample; (a.3) creating a calibration equation for this site; and, (B) during real-time: (b.1) separately impinging on a real-time water sample from the soil light in said two wavelengths; (b.2) determining respective absorbances by the real-time sample in said two wavelengths; and (c) substituting the respective absorbances in the calibration equation to obtain the nitrate concentration in the real-time sample.

The invention provides a method for continuously testing three stable carbon isotopes in soil, and belongs to the technical field of soil detection. The pretreatment process of stable carbon isotope testing of three carbon forms (carbonate inorganic carbon, soluble organic carbon and non-soluble organic carbon) of soil is simplified and integrated, then the same stable isotope ratio mass spectrometer is externally connected with a multipurpose online gas preparation and introduction device and an element analyzer, and the external connection sequence is controlled; and efficient and continuous testing of three carbon isotopes is realized. Compared with a traditional method in which single carbon forms are respectively treated and independently detected, the method has the advantages that the time cost of sample pretreatment and instrument analysis is reduced, error accumulation caused by sample transfer and multiple pretreatment is avoided, and the detection result is more accurate.

The application discloses a method for reducing rice antimony accumulation by using exogenous soluble organic matter, and relates to the field of agricultural environment remediation, and comprises the following steps: S1, selecting at least one of livestock and poultry manure source organic material or crop straw source organic material as raw material, adding ultrapure water according to a solid-liquid ratio of 1:5-1:20, oscillating and extracting for 12-48 hours under the condition of 15-35 DEG C, taking supernatant by centrifugation, filtering through a 0.45 mu m microporous filter membrane, and obtaining a filter solution as an exogenous soluble organic matter solution; S2, applying the exogenous soluble organic matter solution into antimony-polluted paddy soil, and the application amount of the exogenous soluble organic matter is 0.01%-0.5% of soil dry weight in terms of dissolved organic carbon; and S3, maintaining a waterlogged layer of 1-5 cm in the field during the whole growth period of rice, and draining and drying the field before harvesting. The application realizes green remediation of antimony-polluted paddy fields and safe production of rice by using agricultural waste resource products.

The present application relates to the technical field of soil pollution monitoring and analysis, and particularly relates to a soil environmental pollution monitoring and analysis system and method, which comprises soil environment sampling, sample pretreatment, pollution risk multidimensional prediction and control scheme analysis module, through collecting three types of parameters of fiber length, inorganic particle and organic particle size and crop root distance in the matrix, evaluating the optimal sampling scheme, realizing the matching of the sampler and the soil structure characteristics, adopting the two-step method of alkaline depolymerization and targeted enzymolysis to realize the selective removal of organic matter, taking the conductivity change rate and the residual organic carbon content as the control indexes to improve the pretreatment accuracy, combining the sample conductivity, porosity and dissolved organic carbon content to calculate the rhizosphere influence index, automatically distinguishing the rhizosphere layer and the non-rhizosphere layer, constructing the pollution risk index by comprehensively considering the diffusion flux and the absorption flux, and matching the control scheme based on the risk grade.

The invention discloses a method for determining water-soluble organic carbon and rapidly converting the water-soluble organic carbon extracted by a potassium sulfate solution. Tests show that the leaching effect of the 0.05-0.5% low-concentration potassium sulfate solution is equivalent to that of water, the clarity of the filtrate is improved, and water can be replaced for determining the water-soluble organic carbon. The content of the soluble organic carbon and the content of the water-soluble organic carbon have a good linear correlation rule, and a conversion formula can be established between the soluble organic carbon and the water-soluble organic carbon for rapid conversion. The method comprises the following specific steps: selecting a sample with the total soil sample amount of 10-20% from a target sample plot, respectively extracting by using a high-concentration potassium sulfate solution and a low-concentration potassium sulfate solution, measuring the content of the soluble organic carbon and the content of the water-soluble organic carbon, establishing a rapid conversion formula of the soluble organic carbon and the water-soluble organic carbon, and realizing mutual conversion of the soluble organic carbon and the water-soluble organic carbon. The method is suitable for batch samples and filtrate clarification, the process is simplified, the workload is reduced, and labor and time are saved.