18 results about "Soil lead" patented technology

The invention discloses Burkholderia gladioli HM-72 and application thereof, the Burkholderia gladioli HM-72 is preserved in China Center for Type Culture Collection on July 13, 2023, the preservation address is Wuhan University, Wuhan, No. 299, eight road, Wuchang District, Wuhan, Hubei, and the preservation number is CCTCC NO: M20231291. The strain is high in Pb stress resistance, and has the capability of partially dissolving phosphorus and producing siderophores. After the strain is applied to the Pb-polluted soil, the migration rate of Pb can be improved, the removal of Pb in the soil is accelerated, the Pb is accumulated in the overground part of the enrichment plant, the problem of repairing the lead pollution of the soil is solved, meanwhile, the strain can inhibit the growth of pathogenic fungi, the growth promoting and bacteriostasis characteristics of the strain can provide favorable conditions for the growth of the enrichment plant in a high-lead environment, and the application prospect is wide. The biomass accumulation is promoted, and the method has an application prospect in heavy metal polluted environment restoration.

The invention belongs to the technical field of heavy metal pollution treatment, and relates to preparation of a weakly alkaline soil cadmium passivator and a method for passivating soil lead. The alkalescent soil cadmium passivating agent mainly comprises the following components in parts by weight: 20 to 30 parts of graphene oxide modified biochar, 5 to 10 parts of montmorillonite, 5 to 10 parts of bentonite and 5 to 10 parts of a microbial agent, the microbial agent is a composite microbial agent formed by mixing bacillus subtilis, bacillus amyloliquefaciens, bacillus thuringiensis and pseudomonas nitroreducens. The alkalescent soil cadmium passivator has a very good remediation effect on cadmium and lead in polluted soil, can remarkably improve the physicochemical properties of the cadmium and / or lead polluted soil, increase the content of organic matters in the soil, reduce the migration of the soil in the environment and reduce the content of cadmium in crops, and has a great market popularization value.

The invention provides a soil lead element distribution monitoring method and system, and the method comprises the steps: obtaining topographic feature variables, remote sensing index variables, human activity intensity variables and geological feature variables of a plurality of sampling points of a target monitoring region in a specified current monitoring period in a preset variable database, constructing a lead migration potential index, an enhanced vegetation coverage dynamic index and a soil erosion-lead migration coupling index, and obtaining an actual soil lead spatial distribution probability based on a preset soil lead element distribution monitoring model; according to the actual soil lead space distribution probability, based on a preset lead element early warning grading rule, carrying out early warning grading on the sampling points; and according to the early warning level of the sampling point, generating a corresponding lead element early warning instruction and transmitting the lead element early warning instruction to early warning equipment, so that the soil lead element distribution monitoring efficiency can be improved.

The invention discloses a selenium-loaded composite carbon fertilizer and application thereof in lead and zinc associated contaminated soil remediation and selenium-enriched safe planting of crops. The selenium-loaded composite carbon fertilizer is prepared by compounding pomacea canaliculata shell biochar and modified biochar thereof, loading selenium, and co-composting with bidens pilosa and chicken manure. The selenium-loaded composite carbon fertilizer is used for repairing and improving lead and zinc associated contaminated soil, the purposes of fixing lead and zinc in the soil, increasing the selenium content of crops and increasing the content of nutrients such as nitrogen and phosphorus are achieved, and selenium-enriched safe planting of the crops in the lead and zinc associated contaminated soil is achieved on the whole. The selenium-loaded composite carbon fertilizer is applied to soil, so that the ecological risk caused by application of a soil passivating agent is avoided, the excessive use of chemical fertilizer is reduced, and the sustainable development of agriculture is realized; on the other hand, resource utilization of agricultural wastes is facilitated; the fertilizer plays an important role in the aspects of guaranteeing safe production of crops, promoting growth of crops, strengthening soil nutrients, achieving production of selenium-rich crops, repairing lead and zinc pollution of soil and the like.

The application discloses an L-cysteine-based soil lead pollution leaching agent and a preparation method thereof, and belongs to the technical field of soil heavy metal pollution remediation. The L-cysteine-based soil lead pollution leaching agent comprises the following raw materials: an L-cysteine solution, a pH buffer and a polyvinylpyrrolidone solution; the concentration of the L-cysteine solution is 0.3-0.5 mmol / L, the concentration of the pH buffer is 1 mmol / L, and the mass fraction of the polyvinylpyrrolidone solution is 0.003%-0.005%; the volume ratio of the L-cysteine solution, the pH buffer and the polyvinylpyrrolidone solution is 1:1:0.15-0.4. The leaching agent has a remarkable leaching effect on soil lead, and the removal rate of the leaching agent on the contaminated soil with a Pb content of more than 500 mg / kg can reach more than 85%, so that the leaching agent can effectively prevent lead from migrating through the soil into a food chain or a water environment, and is much stronger than a traditional carboxyl-based leaching agent.

The utility model discloses a riverway water and soil loss prevention device, and particularly relates to the field of riverway water and soil loss prevention, which comprises a first limiting mechanism, a second limiting mechanism is fixedly mounted at the center of the first limiting mechanism, a slicking mechanism is slidably mounted on the outer wall of the second limiting mechanism, and the second limiting mechanism comprises a balance pressing plate. The outer wall of the balance pressing plate is provided with a plurality of first guide grooves which are arranged in a penetrating mode, the slicking mechanism comprises a plurality of connecting supports which are connected with the first guide grooves in a sliding mode, one side of each connecting support is provided with a positioning rod which is arranged in a vertical state, and the bottom of each positioning rod is fixedly provided with a scraper. According to the utility model, the plurality of scraping plates capable of horizontally moving in a reciprocating manner are arranged for horizontally scraping soil on the periphery of the balance pressing plate from multiple directions, so that the surface of the soil is always kept in an equal-height state, and the problems that the thickness of the surface of the soil is not uniform, the moisture content in the soil is not uniform, and the soil is lost are solved.

In one embodiment, contamination detection includes attaching a front-facing side of a detector enclosure to a ripper of a ripper machine. The detector enclosure includes a rear-facing side having a rear-facing window, two lateral-facing sides, and a bottom-facing side. A detector is disposed inside the detector enclosure. The ripper is inserted into a soil to position the rear-facing window, the two lateral-facing sides, and the bottom-facing side of the detector enclosure below a soil surface of the soil. The ripper is moved horizontally through the soil leading with the front-facing side of the detector enclosure to detect subsurface contamination via the rear-facing window using the detector.

The present invention discloses a method for preparing a hydrothermal biochar / geopolymer composite material. Wheat straw is crushed and mixed evenly with fly ash. Potassium hydroxide solution is added and stirred in a stirring device. Curing produces a biochar / geopolymer composite precursor, which is then subjected to a hydrothermal carbonization process to obtain the hydrothermal biochar / geopolymer composite material. The straw powder, potassium hydroxide, and distilled water content are 5% to 35%, 65% to 85%, and 30% to 90% of the fly ash mass, respectively. The hydrothermal temperature is 220°C to 260°C, the hydrothermal time is 4 hours, and the hydrothermal medium is a 0-2 mol / L potassium hydroxide solution. The resulting hydrothermal biochar / geopolymer composite material exhibits excellent results when used for the adsorption and removal of lead ions in water and in-situ deactivation of lead in soil. This method has the advantages of simple process, low cost, low energy consumption, resource utilization of solid waste, and environmental friendliness. It has broad application prospects in heavy metal-contaminated water and soil.

In one embodiment, contamination detection includes attaching a front-facing side of a detector enclosure to a ripper of a ripper machine. The detector enclosure includes a rear-facing side having a rear-facing window, two lateral-facing sides, and a bottom-facing side. A detector is disposed inside the detector enclosure. The ripper is inserted into a soil to position the rear-facing window, the two lateral-facing sides, and the bottom-facing side of the detector enclosure below a soil surface of the soil. The ripper is moved horizontally through the soil leading with the front-facing side of the detector enclosure to detect subsurface contamination via the rear-facing window using the detector.

This invention discloses a rapid detection method and system for lead in soil based on quantum dot fluorescence, specifically relating to the fields of optical detection and fluorescence analysis. It addresses the problem of fluorescence signal distortion caused by non-specific heterogeneous aggregation of nanoparticles in the extract solution when existing quantum dot fluorescent probes detect lead in soil. The method acquires the fluorescence spectrum of the mixed system and separates the characteristic fluorescence peaks of the quantum dots. It performs time-resolved measurements of the fluorescence signal, divides the time window of the fluorescence lifetime decay curve according to a preset time threshold, and calculates the integral area. Simultaneously, it analyzes the quenching kinetics of the characteristic fluorescence peak intensity to obtain the fluorescence quenching rate constant, and calculates the lifetime distribution characteristic ratio based on the integral area of ​​the time window. It determines the contribution ratio of non-specific aggregation to the fluorescence quenching rate constant through cooperative deviation analysis. Based on this ratio, it compensates and corrects the intensity of the characteristic fluorescence peak, accurately calculating the lead ion concentration in the soil extract solution.

The invention discloses a method for planting fragrant flower oil-tea camellia in heavy metal lead pollution areas, comprising the following steps: (1) lead content detection: detecting the lead content in the polluted plot, mixing the soil block with the lead content>800mg / kg with a passivator and the topsoil, and then detecting; soil improvement is performed on the plot with the lead content≤800mg / kg; (2) soil improvement: applying a microbial agent composed of sulfate-reducing bacteria, acetic acid bacteria, and Bacillus cereus to the soil block with the lead content≤800mg / kg, then removing the mixed alfalfa and bermudagrass after 1-2 years, and planting fragrant flower oil-tea camellia seedlings instead; (3) planting fragrant flower oil-tea camellia; (4) late management. The method of the present invention reduces the toxicity of lead in the soil to fragrant flower oil-tea camellia by improving the soil before planting, and the fragrant flower oil-tea camellia plants obtained by formulating the planting scheme and late management grow robustly, the fragrant flower oil-tea camellia yield obtained after 4 years is more than 4kg, and the heavy metal lead content in the soil decreases after planting fragrant flower oil-tea camellia for 4 years, thereby achieving the purpose of improving the lead content in the soil.

The invention discloses a preparation method and application of a carboxymethylcellulose-coated phosphorus-doped biochar composite material loaded phosphate solubilizing bacteria functionalized microbial agent, and relates to the technical field of contaminated soil remediation functional materials. The invention aims to solve the problem of low passivation efficiency caused by serious inhibition of biological activity of phosphate solubilizing bacteria by high-concentration heavy metals when the soil lead / cadmium pollution is repaired by adopting a bioremediation method. The method comprises the following steps: mixing a phosphate solubilizing bacteria culture solution with phosphorus-modified biochar, putting the mixture into a constant-temperature oscillator for full oscillation, and performing full centrifugation and freeze drying on the mixture to obtain the biochar-based biological agent loaded with the phosphate solubilizing bacteria; and adding the charcoal-based biological agent loaded with the phosphate solubilizing bacteria into a sodium carboxymethyl cellulose solution, uniformly stirring, and freeze-drying to obtain the phosphate solubilizing bacteria functionalized agent loaded with the carboxymethylcellulose-coated phosphorus-doped charcoal composite material. The preparation method and the application of the phosphate solubilizing bacteria functionalized microbial agent loaded on the phosphorus-doped charcoal composite material coated with the carboxymethyl cellulose can be obtained by adopting the preparation method and the application of the phosphate solubilizing bacteria functionalized microbial agent.

The application discloses a kind of self-adapting multidimensional rectification and collaborative penetration control system and method of suction foundation group.The system is composed of multi-source perception, central control and distributed execution module.The system establishes master-slave collaborative control architecture, the effective soil penetration resistance of bottom of cylinder is real-time inversion through soil resistance soft measurement unit, and geological uneven area is identified in advance.The execution module is configured with two-way fluid control pump station, and differential negative pressure suction sinking is carried out under normal working condition.When extreme soft soil leads to inclination overrun, the pump station on the side of sinking too fast is automatically controlled to switch to positive pressure water injection mode, active jacking torque is generated to rectify powerfully, and anti-pipe heaving protection is assisted.The application effectively solves the problem that suction foundation is prone to irreversible inclination in soft and hard uneven geology, and realizes automatic and high-precision collaborative penetration installation.

The present invention discloses a gladiolus Burkholderia (Burkholderia gladioli) HM-72 and its application, which has been deposited in China Center for Type Culture Collection on July 13, 2023, and the deposit address is Wuhan University, No. 299 Bayi Road, Wuchang District, Wuhan City, Hubei Province, and the deposit number is CCTCCNO: M20231291. The strain has strong resistance to Pb stress, has partial phosphate dissolution, and the ability to produce siderophores. After applying the strain in Pb-contaminated soil, the mobility of Pb can be increased, the removal of Pb in the soil is accelerated and accumulated in the above-ground parts of enriched plants, to achieve the problem of repairing soil lead pollution, while the bacteria can inhibit the growth of pathogenic fungi, and its growth-promoting antibacterial properties can also provide favorable conditions for the growth of enriched plants in high-lead environments, promote its biomass accumulation, and have application prospects in environmental remediation of heavy metal pollution.

The present invention discloses a method for using Pseudomonas stutzeri for biomineralization to repair lead-contaminated saline-alkali soil, belonging to the technical field of soil heavy metal remediation. In the present invention, Pseudomonas stutzeri, calcium acetate and calcium citrate that have passed the activity test and adaptability test are applied to the lead-contaminated saline-alkali soil, and the biomineralization of Pseudomonas stutzeri is utilized to repair the lead-contaminated soil. During the process of Pseudomonas stutzeri biosynthesizing calcium carbonate precipitate using calcium acetate and calcium citrate, lead ions in the soil can be precipitated in the form of coprecipitation or locked in the crystal lattice of calcium carbonate, thereby effectively reducing the mobility and toxicity of soil lead and achieving the purpose of in-situ passivation of soil lead and safe utilization of soil. All the medicaments involved in the present invention can be completely degraded or precipitated, and will not exacerbate the salinization of the soil. The present invention is applicable to the remediation of saline-alkali soil contaminated with lead at medium and low concentrations.

The application belongs to the technical field of heavy metal pollution treatment, and relates to a preparation of a weak alkaline soil cadmium passivator and a method for passivating soil lead. The weak alkaline soil cadmium passivator mainly comprises the following components in parts by weight: graphene oxide modified biochar 20-30 parts, montmorillonite 5-10 parts, bentonite 5-10 parts and microbial inoculum 5-10 parts, wherein the microbial inoculum is a composite inoculum composed of Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus thuringiensis and Pseudomonas nitroreducens. The weak alkaline soil cadmium passivator has a good repairing effect on cadmium and lead in contaminated soil, can significantly improve the physicochemical properties of cadmium and / or lead contaminated soil, increase the soil organic matter content, reduce the migration in the environment, reduce the cadmium content in crops, and has great market promotion value.

The invention relates to the technical field of soil detection, and discloses equipment and method for detecting lead and cadmium in soil based on a graphite furnace method.The equipment comprises a bottom plate, a protective cover is connected to the upper end of the bottom plate, a rotating disc is rotatably connected to the upper end of the bottom plate, a digestion tank is arranged above the rotating disc, a funnel is connected to the upper end of the digestion tank, and a transfer table is slidably connected to the funnel; a partition strip is connected into the transfer table, one side of the partition strip is rotationally connected with a sector plate, a sliding block is slidably connected to the bottom plate, one side of the sliding block is connected with a supporting ring, the transfer table is sleeved with the supporting ring, a sliding frame is connected to the upper end of the bottom plate, and a beating frame is connected to the sliding frame. Closed quantitative feeding of soil samples is achieved, sample loss and detection precision deviation caused by flying dust generated by manual transfer are avoided, meanwhile, sample blockage at an inlet of the digestion tank can be prevented in an intermittent discharging mode, and the stability and precision of the feeding link are improved.

The application relates to the field of agricultural planting technology, and discloses a planting method for reducing the lead content of wheat by combining chelation induction and leaf surface control, which comprises the following steps: firstly, detecting and screening the soil lead, implementing differentiated deep plowing and soil conditioner application on lead-free land and low-lead land, adopting standard deep plowing and applying silicon calcium mineral materials and biological agents on the lead-free land; deepening the deep plowing and applying a composite passivation regulator containing calcium dihydrogen phosphate, modified biochar and sepiolite on the low-lead land, shallow plowing before sowing and base application of an EDDS and citric acid compound chelation inducer, implementing differentiated leaf surface nutrient spraying and rhizosphere management at the seedling stage, spraying a leaf surface control agent at the jointing stage to construct a siliconized cell barrier, performing leaf surface control and nutrient synergistic spraying at the booting stage to the filling stage, dynamically monitoring the lead transport risk, and finally detecting the lead content and verifying the quality at the mature stage; through three-level synergistic control of the soil-root-leaf, the lead content of the wheat grains approaches 0.