54 results about "Cation-exchange capacity" patented technology

The invention provides a calcium humic acid modified biochar composite material as well as a preparation method and application thereof. The preparation method specifically comprises the following steps: preparing calcium modified biochar powder from biochar powder and a calcium source; mixing humic acid with the calcium modified charcoal powder, filtering and drying to obtain a calcium humic acid modified charcoal composite material; wherein the mass ratio of the humic acid to the calcium modified charcoal powder is 1: (2-20). When the calcium humic acid modified biochar composite material is used as a soil remediation agent for soil remediation, the pH value, the organic matter content and the cation exchange capacity of soil can be improved, the soil hardening degree is relieved, heavy metal lead and cadmium and ions thereof can be immobilized in the modes of ion exchange, electrostatic adsorption, surface complexing, deposition and the like, and the soil remediation efficiency is improved. The soil heavy metal content is further reduced.

The invention belongs to the technical field of biological bacterial fertilizers, and discloses a Chinese herbal medicine carrier-based multifunctional microbial bacterial fertilizer, which comprises a microbial strain group, a Chinese herbal medicine active component group, an organic matter and nutrition carrier, mineral elements and auxiliary components, and a functional synergist. Through the synergistic interaction of Chinese herbal medicine active ingredients and functional microbial flora, breeding of harmful bacteria in soil is inhibited, synthesis of acetylcholin esterase of nematodes is interfered, a continuous cropping disease occurrence chain is blocked from the source, and meanwhile, organic acid and flavonoid substances slowly released by a Chinese herbal medicine carrier are utilized to activate resistance gene expression of a plant system, so that the disease resistance of the nematodes is improved. The tolerance threshold of crops to high temperature, cold damage and diseases is enhanced; in the composite carrier, humic acid and diatomite are crosslinked through hydrogen bonds to form a stable granular structure, the cation exchange capacity and porosity of soil are effectively improved, the strong hydration capacity of polyglutamic acid is combined to lock nutrients and moisture, and development of meristem of a root system and proliferation of capillary roots are promoted.

The invention provides a heavy metal contaminated soil remediation material, and belongs to the technical field of soil remediation. According to the method, the silicon-magnesium modified sunflower straw biochar and the organic fertilizer (chicken manure) are used for synergistically repairing the chromium and lead heavy metal contaminated soil, the adsorption performance of the modified biochar and the biological absorption effect of the organic fertilizer are used for jointly reducing the absorption of spinach to the heavy metal chromium and lead, meanwhile, the physical and chemical properties of the soil are improved, and the nutrient activity of the soil is remarkably improved. Results show that the effective cation exchange capacity, organic matters and available phosphorus of the soil are improved by synergistic remediation of the modified biochar and the organic fertilizer, the pH value of the soil is reduced (averagely reduced by 0.48), the combined application effect of the modified biochar and the organic fertilizer is more obvious, and the absorption of chromium and lead by the spinach is averagely reduced by 26.04% and 18.22% respectively. The invention provides an effective and practical way for reducing the composite toxicity of plants to various metals such as chromium, lead and the like.

The invention discloses an acidified soil conditioner and a preparation method thereof. The preparation method of the conditioner comprises the following steps: preparing a nano composite material: drying and crushing oyster shells, sieving and calcining to obtain oyster shell powder, namely the nano composite material; the preparation method comprises the following steps: preparing composite biochar powder: drying and grinding cleaned agricultural waste rice straws into powder, and carrying out sieving and calcining treatment to obtain straw biochar; mixing alkaline phosphate, sulfide, hemi-ferrite, manganese salt, clay, a microbial agent and straw charcoal in proportion to obtain composite charcoal powder; and preparing the acidified soil conditioner: compounding the nano composite material and the composite charcoal powder in proportion, and carrying out molding treatment on the complexing agent powder to obtain the acidified soil conditioner. The method has the beneficial effects that the available heavy metals in the soil can be reduced, the cation exchange capacity of the soil is enhanced, the acidification is neutralized, the soil fertility is improved, and the heavy metal pollution of the acidified farmland is repaired.

The invention belongs to the technical field of earth and rockfill dam deep burying disease identification and positioning, and discloses an earth and rockfill dam leakage channel comprehensive detection method and system, and the method comprises the steps: determining the distribution of detection points detected by an electrical method, and collecting the apparent resistivity data and the apparent polarizability data of the detection points; inverting apparent resistivity and apparent polarizability data to obtain a resistivity profile and a polarizability profile, and obtaining a normalized polarizability profile based on the resistivity profile and the polarizability profile; performing stratum zoning on the to-be-detected area based on the section, determining the soil cation exchange capacity and the cementation index of the zoned stratum, and calculating the soil water content and the permeability of the measured section according to the normalized polarizability, the soil cation exchange capacity and the cementation index; and determining an earth and rockfill dam leakage channel according to a water content and permeability judgment mechanism. According to the method, the uncertainty of a single physical property threshold value method is overcome, and the accuracy and precision of the leakage hidden danger of the earth and rockfill dam are improved.

The invention relates to the technical field of sewage treatment, in particular to an urban sewage treatment plant sludge deep dehydration conditioner and an application method thereof, and the urban sewage treatment plant sludge deep dehydration conditioner comprises the following raw materials: functional layered composite powder, cationic polyacrylamide, diatomite and sodium carbonate. After the functionalized layered composite powder and the bentonite are organically modified by the lauryl trimethyl ammonium bromide, the interlayer spacing is obviously increased, the hydrophobic property and the cation exchange capacity are excellent, negative charges on the surface of sludge colloid can be efficiently neutralized, a double-electrode-layer structure can be destroyed, and part of bound water can be released; ferric hydroxide deposited on the surface serves as amphoteric metal hydroxide, further compresses double electric layers through electric neutralization, forms an amorphous net structure and serves as a high-efficiency adsorption flocculation net to capture fine sludge particles; under the synergistic effect of the powder and cationic polyacrylamide, efficient removal of water combined with sludge and water in cells is achieved, and the dual purposes of deep dehydration and mud cake volume reduction are achieved.

The invention belongs to the technical field of soil amendments, and particularly relates to a saline-alkali soil biological-mineral composite amendment prepared from industrial waste and a preparation method thereof. Alkali fusion activated steel slag provides a quick-acting active calcium source, hydrothermal modification neutralized red mud forms hydrated aluminosilicate gel solid sodium, modified biochar enhances cation exchange capacity, a composite functional bacterial agent drives MICP biomineralization reaction, a quick-acting-slow-release-storage three-stage gradient improvement system is established, and the quick-acting-slow-release-storage three-stage gradient improvement effect is achieved. According to the present invention, the effects of 0-50 cm soil profile full-layer improvement and 12-24 month continuous improvement are achieved, 90 d after the modifier is applied, the soil pH value of the severe saline-alkali soil is reduced to 7.8 from 10.1, the conductivity is reduced to 3.2 dS / m from 11.5 dS / m, the sodium adsorption ratio is reduced to 11 from 42, the crop yield increase amplitude reaches 40-60%, 15-25 kg of the modifier is fixed per ton, and the industrial waste resource utilization rate gt is achieved; 90%.

The invention discloses an iron-phosphorus biochar-based fertilizer suitable for saline-alkali soil, which has a good nutrient slow-release characteristic, and also provides a preparation method and an application approach of the fertilizer. According to the product, biomass which is wide in source and low in cost is taken as a basic raw material, and nutrient elements such as nitrogen, phosphorus and potassium are successfully converted into various forms with a slow-release function by introducing iron-phosphorus composite modification and combining a high-temperature pyrolysis technology, so that the utilization efficiency and the lasting supply capacity of nutrients are greatly improved. The prepared biochar-based fertilizer can effectively optimize the physical and chemical environment of saline-alkali soil, for example, increase soil organic matters and enhance cation exchange capacity, also can relieve adverse effects of salt stress on rice growth, and supports healthy development of saline-alkali tolerant rice. The method is simple and convenient in process, high in environmental compatibility and remarkable in economic benefit, and has wide popularization value and application potential in the aspects of saline-alkali soil improvement and crop safety production.

This application discloses a method for reducing the arsenic content of rice grown in alkaline arsenic-polluted paddy fields, belonging to the field of soil remediation technology. The method involves pretreating air-dried electrolytic manganese slag, zeolite, and desulfurized gypsum. The pretreated electrolytic manganese slag, natural zeolite, and desulfurized gypsum are then mixed uniformly to obtain an EMR-ZL-FGD mixed sample. This mixed sample can alter the speciation of arsenic in the soil and effectively reduce the available arsenic content. When the EMR-ZL-FGD addition is 2 wt%, the available arsenic content in the soil is reduced by 50.34%. Soil pH and cation exchange capacity are positively correlated with available arsenic content, while redox potential is negatively correlated. The passivating material EMR-ZL-FGD can effectively reduce the arsenic content in the underground roots, aboveground stems and leaves, and grains. Furthermore, the higher the EMR-ZL-FGD addition, the less arsenic is accumulated in the rice.

The invention relates to the field of disaster prevention and reduction of underground engineering, and provides a prediction and analysis method for water gushing and mud bursting disasters of a tunnel in order to improve the accuracy of prediction of the water gushing and mud bursting disasters. The water content and the permeability are directly obtained, and the water-containing body characteristics are distinguished through the cation exchange capacity, so that the recognition precision is improved. The water inflow is calculated through the volumetric water content distribution, and calculation crossing of the water inflow from qualitative and semi-quantitative to quantitative is achieved; and actually-measured cloud picture data is substituted into numerical simulation, so that high-precision calculation is realized, and the accuracy of prediction and analysis of water burst and mud burst disasters is higher.

This invention discloses a method for preparing an attapulgite-based acidic soil remediation agent. The method includes: (1) mixing urea solution and biochar and reacting them hydrothermally to obtain urea-modified biochar; (2) mixing attapulgite, calcium silicate, and urea-modified biochar to obtain the attapulgite-based acidic soil remediation agent. Compared with the prior art, applying the remediation agent of this invention to acidic soil in a single application can not only improve various physicochemical indicators such as soil pH, electrical conductivity, water holding capacity, alkaline nitrogen, available phosphorus, available potassium, soil organic matter, and cation exchange capacity, but also enhance soil enzyme activity and promote crop growth and development.

The invention discloses a soil cation exchange capacity detection method based on color developing solution image recognition, and relates to the technical field of soil physicochemical property detection. Comprising the following steps: acquiring a supernatant image after a soil sample of to-be-detected soil reacts with a methylene blue solution under a multi-light-source condition; zero-sample semantic segmentation is carried out on color blocks in the supernatant image to extract position information of different color developing areas in the color blocks, and color partitions are obtained; performing color correction on the color subareas to eliminate color deviation of the color subareas under different light source conditions to obtain RGB parameters of the methylene blue circular color development area; and inputting the RGB parameters into an extreme gradient lifting algorithm so as to fit a numerical relationship between the color concentration of the color developing area and the soil cation exchange capacity, thereby obtaining the soil cation exchange capacity of the soil to be detected. According to the method, a complex chemical detection process is converted into a visual calculation task, and an artificial chemical process depending on multiple ion exchange, washing and titration is simplified.

The present invention discloses a slow-release fertilizer, which comprises: (1) fly ash, (2) dipotassium hydrogen phosphate and / or potassium dihydrogen phosphate and / or tripotassium phosphate, and (3) an inorganic base. The slow-release fertilizer is prepared by mixing fly ash, dipotassium hydrogen phosphate and / or potassium dihydrogen phosphate and / or tripotassium phosphate and the inorganic base, calcining at 550-850°C, adding water after cooling, and crystallizing under pressure at a temperature of 110-160°C. The prepared fertilizer P and K nutrient elements are loaded in a porous, high-specific-surface-area microporous molecular sieve, with a high loading amount, slowly released through the environment, and having a long-lasting fertilizer effect. The molecular sieve material has a high specific surface area and cation exchange capacity, and in the presence of Cd 2+ ions, Cr 6+ When used in soil environments with highly toxic heavy metal ions such as ions, it can effectively adsorb heavy metal ions in the environment, control their entry into crops, and protect food health.

The present invention relates to a layered silicate having a cation exchange capacity in the range of 70-130 meq / 100 g, having leachable sodium cations in the range of 65-130 meq / 100 g, having leachable magnesium cations in the range of 5-65 meq / 100 g, having leachable calcium cations in the range of 15-95 meq / 100 g, and having a cation exchange capacity in the range of 70-130 meq / 100 g, having leachable sodium cations in the range of 65-130 meq / 100 g, having leachable magnesium cations in the range of 5-65 meq / 100 g, having leachable calcium cations in the range of 15-95 meq / 100 g, and wherein the sum of the leachable sodium, magnesium and calcium cations is at least equal to the cation exchange capacity, and wherein an aqueous suspension containing 5% by weight of the layered silicate has a rotary viscosity at 10 rpm of 30 mPas or higher measured at a temperature of 23 DEG C.

The foundry sand for a casting mold has foundry sand in which a first coating layer is disposed on the surface of one or two types of aggregate selected from reclaimed sand (A) and fire-resistant aggregate (B) containing SiO2, and a second coating layer that is located on the first coating layer of the foundry sand and contains a silicate, the foundry sand has a cation exchange capacity (CEC) of 3 mmol (+) / kg or more and 40 mmol (+) / kg or less.

The present application relates to the field of agricultural ecological environment management and carbon sink monitoring technology, and more particularly to a tea tree lossless tea garden carbon fixation and sink increase method, comprising: pyrolyzing agricultural waste to obtain biochar and making the biochar into a specific standard biochar-based fertilizer; determining tea garden soil organic matter, cation exchange capacity and soil bulk density, calculating soil quality comprehensive coefficient by using improved Nemerow comprehensive index method and dividing soil quality grades according to the soil quality comprehensive coefficient; applying the biochar-based fertilizer in a differentiated application amount according to the soil quality grades; determining tea tree aboveground biomass after fertilization and calculating tea tree carbon storage according to a corresponding carbon storage model selected according to the age of the tea tree; simultaneously determining soil parameters to calculate tea garden soil carbon storage; and finally taking the tea tree carbon storage and the soil carbon storage as the total carbon sink of the tea garden. The present application realizes systematic, accurate and lossless monitoring of tea garden carbon fixation and sink increase technology.

This invention relates to a microbial composition for preventing and controlling root rot in tea trees and its application, belonging to the field of microbial and organic fertilizer technology. The composition comprises the following components: Component 1, Bacillus kaempferi and Trichoderma yunnanensis; Component 2, humic acid, Chrysanthemum indicum extract, amino acids, brown algae oligosaccharides, complex vitamins, and trace elements; wherein, Bacillus kaempferi is N4471 (…). Bacillus cabrialesii The accession number is CCTCC NO: M20221660, and the Yunnan Trichoderma is YNK-FG0001 ( Trichoderma yunnanense The microbial composition, with accession number CCTCC NO: M 2025645, significantly improved soil water stability aggregates, pH, and cation exchange capacity when applied to tea plant cultivation. It also enhanced root vitality and the activity of antioxidant enzymes [superoxide dismutase (SOD) and peroxidase (POD)], thereby reducing the growth of Fusarium rot (…). Fusarium solani ), Pythium ( Pythium spinosum ) and teosinte ( Rosellinia arched The disease index of tea tree root rot caused by infection was used to ultimately achieve effective control of tea tree root rot.

The present application relates to the technical field of shale gas drilling solid waste resource utilization, in particular to a method for improving water-based drilling cuttings by using rotten straw and artificial soil prepared by using the water-based drilling cuttings. The method for improving water-based drilling cuttings comprises the steps of leaching, sieving and mixing water-based drilling cuttings with sieved rotten straw, and can effectively improve the texture performance and physicochemical properties of water-based drilling cuttings, especially the soil cation exchange capacity and permeability, and can be used for treating water-based drilling cuttings generated in oil and gas exploitation. The method for improving water-based drilling cuttings can effectively overcome the problems of high cost, complicated operation, limited source of treatment agent and unsatisfactory improvement of soil texture performance in the prior art.

The inorganic precoated sand is a dry inorganic precoated sand having foundry sand and a second coating layer, the foundry sand having one or two aggregates selected from reclaimed sand (A) and fire-resistant aggregates (B) and a first coating layer located on the surface while covering the aggregates, the second coating layer being located on the first coating layer of the foundry sand and containing metasilicate, the refractory aggregate (B) contains SiO2, and the cation exchange capacity (CEC) of the foundry sand is 3 mmol (+) / kg or more and 40 mmol (+) / kg or less.

This invention discloses a method for predicting cation exchange capacity (CEC) based on changes in soil hygroscopic water content. The method comprises the following steps: S1: Determining the water activity range based on the soil water vapor adsorption mechanism; S2: Determining two reagents based on the water activity range determined in S1 and the safety and cost considerations of using saturated salt solutions to control water activity, and determining the specific water activities of the two reagents; S3: Selecting multiple samples and determining the soil CEC using conventional methods, while simultaneously determining the soil hygroscopic water content of the samples at the specific water activities of the reagents determined in S2; S4: Establishing a predictive model between the change in hygroscopic water content and CEC within the specific water activity range; S5: Determining the hygroscopic water content of the sample under test at the two specific water activities and calculating the change in hygroscopic water content, then using the predictive model to calculate the CEC of the soil sample. This method can quickly and accurately predict soil CEC when dealing with a large number of samples, saving time, manpower, and testing costs.

The present application belongs to the technical field of soil spectrum detection and agricultural informatization, and discloses a multi-modal spectrum soil property estimation method based on task priori gated distillation. Visible-near infrared reflectance spectrum, X-ray fluorescence spectrum and laser-induced breakdown spectrum of the same sample are obtained, and after pretreatment, teacher soft labels and intermediate features are generated by PLS, SF-PLS and GR chemometric teacher models; the student network extracts modal features through three one-dimensional convolution branches, adopts GeM / TopK aggregation, Dirichlet task gating and double expert prediction modules for fusion and regression, and is jointly trained by output distillation, feature distillation, true value regression and gating regularization. In the inference stage, only the student network is deployed for clay, organic matter, cation exchange capacity, pH, base saturation and extractable phosphorus, potassium, calcium and magnesium estimation.

This invention discloses a method for preparing attapulgite-based hydrogel. The method includes: (1) mixing ethylene carbonate, ethylene glycol, phosphoric acid, and straw powder and heating to react, obtaining liquid biomass; (2) mixing acid-modified attapulgite, acrylic acid, acrylamide, and liquid biomass in water, then adding a crosslinking agent to react and obtain the attapulgite-based hydrogel. Compared with the prior art, the attapulgite-based hydrogel of this invention not only reduces the salinity of saline-alkali soils but also significantly increases the soil's cation exchange capacity and the levels of key N and K nutrients.

The invention discloses a fertilizer synergist based on marine biogen functional group modification and a preparation method and application thereof, and relates to the technical field of agricultural biotechnology and novel fertilizer additives, and the preparation method comprises the following steps: raw material pretreatment: taking marine algae, shellfish or marine fish processing leftovers as raw materials, cleaning, crushing to 60-100 meshes, and drying to obtain the fertilizer synergist; according to the method, marine biogen is taken as a raw material to obtain marine biogen coarse powder, active functional groups such as sulfonic groups and carboxyl groups are successfully introduced to a molecular skeleton of the marine biogen through alkaline hydrolysis and a specific functional group directional modification process, and a final product has high cation exchange capacity and pH buffer characteristics based on Hexchange and neutralization reaction through ion exchange treatment; the synergist can adsorb and preserve nutrient ions, and after the synergist is applied to soil, through interaction of functional groups of the synergist and ions of a rhizosphere environment, the pH of a micro-domain can be easily adjusted to be neutral, so that favorable conditions are created for effective utilization of nutrients, and meanwhile resource utilization of marine processing leftovers is achieved.

The invention discloses a method for reducing the arsenic content of rice growing in an alkaline arsenic polluted rice field, and belongs to the technical field of soil remediation. Air-dried electrolytic manganese residues, zeolite and desulfurized gypsum are pretreated, specifically, the pretreated electrolytic manganese residues, natural zeolite and desulfurized gypsum are evenly mixed, and an EMR-ZL-FGD mixed sample is obtained; an electrolytic manganese residue-zeolite-desulfurized gypsum mixed sample can change the form distribution of arsenic in the soil and effectively reduce the effective arsenic content of the soil, and when the addition amount of EMR-ZL-FGD is 2 wt%, the effective arsenic content of the soil is reduced by 50.34%; the soil pH value and the cation exchange capacity are in positive correlation with the effective arsenic content, the oxidation-reduction potential is in negative correlation with the effective arsenic content, the passivation material EMR-ZL-FGD can effectively reduce the arsenic content of underground roots and overground stem leaves and grains, and the more the dosage of the EMR-ZL-FGD is, the less the enrichment of arsenic by rice is.

The present application relates to the field of underground engineering disaster prevention and mitigation, in order to improve the accuracy of water inrush and mud disaster prediction, a kind of tunnel water inrush and mud disaster prediction analysis method is provided. By directly obtaining water content and permeability, and distinguishing the characteristics of water body by cation exchange capacity, the identification accuracy is improved. The water inrush is calculated by using the volume water content distribution, which realizes the qualitative and semi-quantitative to quantitative calculation of water inrush. And the measured cloud data is brought into numerical simulation, high-precision calculation is realized, and the accuracy of water inrush and mud disaster prediction analysis is higher.

The invention relates to a microbial composition for preventing and treating root rot of tea trees and application thereof, and belongs to the technical field of microorganisms and organic fertilizers, the composition comprises the following components: component 1, bacillus caramei and trichoderma yunnanense; component 2: humic acid, crowndaisy chrysanthemum extract, amino acid, alginate oligosaccharide, multivitamins and medium trace elements; wherein the bacillus caramei is N4471, the preservation number of the bacillus caramei is CCTCC (China Center For Type Culture Collection) NO: M20221660, the trichoderma yunnanense is YNK-FG0001 (Trichoderma yunnanense), and the preservation number of the trichoderma yunnanense is CCTCC NO: M 2025645. When the microbial composition is applied to tea tree planting, soil water-stable macroaggregate, pH and cation exchange capacity can be remarkably improved, root activity and antioxidant enzyme [superoxide dismutase (SOD) and peroxidase (POD)] activity are improved, the disease index of tea tree root rot caused by infection of Fusarium solani, Pythium spp and Rosellinia arcuata is further reduced, and the disease resistance of the tea tree root rot is improved. And finally, effective prevention and control of the tea tree root rot are realized.

The present invention relates to the technical field of soil conditioners, and more particularly to a modified biochar composite conditioner for improving soil acidification and low organic matter content, and a preparation method thereof. The modified biochar composite conditioner for improving soil acidification and low organic matter content is prepared by modifying corn stalk particles with 3-(triethoxysilyl)propyl succinic anhydride, loading them with magnesium chloride and sodium silicate, and calcining and sieving them. The conditioner can effectively increase the pH value, cation exchange capacity, and organic matter content of the soil, while significantly increasing the clay content in the soil, improving soil structure, enhancing the soil's water and fertilizer retention capacity, and improving nutrient supply efficiency, thereby promoting crop growth.

A method for calculating a cation exchange capacity, CEC, associated with a mineral sample includes receiving a material sample, altering the material sample to become a mineral sample that fits into an automated mineralogy and petrography system, analyzing the mineral sample with the automated mineralogy and petrography system to generate a mineral map, selecting only clays from the mineral map, calculating a total surface area of the clays in the mineral map, and calculating the CEC value of the material sample based on the total surface area of the clays of the mineral map and for all minerals in the mineral map.

The present application relates to sewage treatment technical field, specifically, it relates to a kind of urban sewage treatment plant sludge deep dewatering conditioning agent and its application method, it includes the following raw materials: functionalization layered composite powder, cationic polyacrylamide, diatomite and sodium carbonate.Functionalization layered composite powder is used in the present application, after bentonite is organically modified by lauryl trimethylammonium bromide, interlayer spacing significantly increases, with excellent hydrophobicity and cation exchange capacity, can efficiently neutralize the negative charge on the surface of sludge colloid, destroy double electric layer structure, release part of bound water;Iron hydroxide deposited on its surface as amphoteric metal hydroxide, further through electric neutralization compresses double electric layer, and forms amorphous reticular structure, acts as high-efficiency adsorption flocculation net, captures small sludge particles;The synergistic effect of the powder and cationic polyacrylamide realizes the efficient removal of sludge bound water and intracellular water, achieves the dual goal of deep dewatering and sludge cake volume reduction.