54 results about "Heavy metal chelation" patented technology

The invention discloses a heavy metal chelating agent for industrial wastewater and a preparation method of the heavy metal chelating agent, and belongs to the technical field of sewage treatment.The preparation method comprises the steps that 2-hydroxyphenylboronic acid is subjected to graft modification through acrylic acid and polymerized on the surface of activated biomass porous carbon powder with acrylic acid, boron-containing polymer modified porous carbon is obtained, and then ferric chloride hexahydrate serves as an iron source; a boron-containing polymer modified porous carbon surface and aminated magnetic adsorption nanospheres are obtained, B-N coordination is formed between the aminated magnetic adsorption nanospheres and the boron-containing polymer modified porous carbon surface, boron element fixation is achieved through modified copolymerization, loss caused by long-time use of the boron element is avoided, lasting and stable chelation is guaranteed, activated biomass porous carbon serves as a carrier, and macromolecular resin serves as a coating layer. The environment-friendly biochar has the advantages of favorable degradability, greenness, degradability, safety and high efficiency, and avoids the problem of secondary pollution caused by the use of a chelating agent.

The utility model relates to a kind of water body heavy metal pollution cyclic repair equipment, its structure is: three purification columns are positioned in the shell inner cavity circumference, heavy metal chelate particles are equipped in purification column;Water tank is connected at the lower end of shell, three water tanks of upper open are distributed in the circumference in water tank, the top of water tank corresponds with the position of purification column, the top of water tank is connected inlet pipe, extends water tank, pipe end portion has butterfly valve, the bottom of water tank is connected outlet pipe, extends water tank, pipe end portion has three-way valve;Positioning plate is connected at the upper end of shell, three water circulation pumps are peripherally arranged in positioning plate, the water inlet of water circulation pump upper end is communicated with the inner cavity of corresponding water tank by outlet pipe, the water outlet position of water circulation pump lower end corresponds with the upper end opening position of purification column. The repair equipment can repair heavy metal pollution water body by the purification column filled with adsorption material, and through water circulation system, improve water body repair efficiency, realize heavy metal recovery and the reuse of adsorption material.

The application discloses a special leaching agent for organic matter and heavy metal compound contaminated soil and a preparation method thereof, relates to the technical field of leaching agents for compound contaminated soil and preparation thereof, and the preparation steps are as follows: first, carboxyl-modified fulvic acid is prepared, a mineral source fulvic acid is taken to prepare a suspension, high-purity nitrogen is introduced to remove oxygen, and then ammonium persulfate initiator is added; after water bath heating, acrylic acid monomer is uniformly and slowly added for reaction; after the reaction is completed, the system pH is adjusted; after dialysis and impurity removal, freeze-drying is carried out to obtain modified fulvic acid with an acrylic acid grafting rate of 15% to 30%; and the modified fulvic acid is taken to prepare a phosphate buffer suspension. The application improves the number of active functional groups of fulvic acid through acrylic acid grafting modification, greatly enhances the heavy metal chelation and polycyclic aromatic hydrocarbon solubilization capacity, and covalently crosslinks functional bacteria on the fulvic acid carrier, so that the functional bacteria can be adapted to different acid-base values of contaminated sites and are suitable for soil remediation of various compound contaminated sites.

This invention discloses a treatment process for high-concentration sulfate wastewater, belonging to the field of wastewater purification technology. The invention first provides a multifunctional composite ion sieve, the raw materials of which include magnetic core microspheres, calcium aluminate precursor components, heavy metal chelating agents, scale inhibitors, antioxidants, antibacterial agents, host-guest recognition agents, polysaccharide compounds, polyacrylic acid compounds, crosslinking agents, and initiators. The ion sieve is prepared through steps including magnetic core preparation, calcium aluminate precursor functional layer deposition, small molecule modification layer loading, and pH-responsive outer shell coating. In use, the ion sieve is added to wastewater and stirred for adsorption. After adsorption saturation, solid-liquid separation is achieved through magnetic separation, and the material is regenerated and recycled sequentially using desorption and reconstruction solutions.

The invention discloses a method for preparing a humic acid anchored hydrotalcite coated Fe3O4 magnetic material based on salt lake bischofite and application, and belongs to the technical field of heavy metal adsorbents. The method comprises the following steps: preparing high-purity magnesium chloride hexahydrate by taking salt lake bischofite as a raw material, mixing with an aluminum source, hydrolyzing to generate a hydrotalcite precursor, and decomposing the nitrogen source to provide an alkaline environment to promote formation of a layered structure; humic acid is chelated with heavy metals through functional groups and is stably anchored on the surface of hydrotalcite, Fe3O4 is used as a magnetic substrate, the material is endowed with magnetism, and a hydrothermal one-step in-situ growth composite structure is realized. The composite material combines the advantages of humic acid, hydrotalcite and Fe3O4, the adsorption capacity is remarkably improved, chemical adsorption is enhanced, efficient solid-liquid separation is achieved, and the defects of traditional materials are overcome. When the bischofite is used as a heavy metal adsorbent, lead ions can be efficiently removed and rapidly recovered, the steps are simple, the cost is low, the effect is remarkable, a new way is developed for utilization of the bischofite in the salt lake, and the bischofite has subject and application values.

The application discloses a heavy metal chelating agent and a preparation method thereof. The heavy metal chelating agent is obtained by controlling the synthesis of melamine formaldehyde resin prepolymer and introducing a dithiocarbamate salt group with a chelating function into the structure of the melamine formaldehyde resin prepolymer. The heavy metal chelating agent has the characteristics of high efficiency and stability, high heavy metal removal rate, fast settling speed of chelation products, low leaching, and low cost, and is suitable for industrialized treatment of heavy metal pollution in fly ash and industrial wastewater.

The invention belongs to the technical field of household garbage incineration fly ash treatment and resource comprehensive utilization treatment. After fly ash is subjected to low-temperature thermal decomposition to remove dioxins, discharged tail ash is subjected to pulping, defoaming, heavy metal chelating, washing dechlorination and dehydration, and the tail ash and washing water for impurity removal and calcium removal sludge are dehydrated together and can be directly used as a slurry admixture for low-activity concrete; other one or more oxides of silicon, aluminum, calcium and the like are further added, and the slurry admixture for concrete with higher activity can be prepared through wet grinding. Dioxins in the fly ash, heavy metals in the washing water and chlorine salts are treated, and tail ash solid content treatment products are used as common solid wastes for resource utilization; the prepared slurry admixture for concrete is low in ignition loss and chloride ion content, and can be used as a commodity. The technology provides a comprehensive utilization approach of fly ash solid content treatment products, broadens utilization channels of fly ash low-temperature thermal decomposition treatment products, is short in technological process, compact in equipment arrangement, high in water requirement for washing and high in treatment adaptability of fly ash with different chlorine contents, optimizes reduction of heavy metals, and is stable in production process and product quality, environment-friendly and suitable for industrial production. Therefore, the method has the characteristics of saving investment and production cost.

This application relates to the field of waste liquid recycling and treatment technology, specifically disclosing a DMF waste liquid recycling and treatment process. The DMF waste liquid recycling and treatment process includes the following steps: S1, adding a modified polyethyleneimine adsorbent to DMF waste liquid from the electronics industry, stirring and reacting, and then filtering to obtain a residue-free waste liquid; S2, adding a heavy metal chelating agent to the residue-free waste liquid, stirring and reacting to obtain a mixture containing precipitate; S3, centrifuging the mixture, then adding anhydrous calcium chloride, allowing it to stand, and then filtering to obtain a purified solution; the purified solution is sent to a vacuum distillation column for distillation, and the bottom fraction is collected to obtain regenerated DMF. The recycling and treatment process of this application can effectively remove heavy metal ions and organic resins from DMF waste liquid, thus facilitating the recycling and reuse of DMF.

The invention relates to the technical field of water treatment technology, and particularly discloses a solid composite water purifying agent and a preparation method thereof, the solid composite water purifying agent comprises the following components by weight: 20-25 parts of a corrosion and scale inhibitor, 0.3-0.6 part of an auxiliary agent, and 0.1-0.4 part of a flocculant. By compounding the corrosion and scale inhibitor, the removal range of metal ions is widened, and the removal of heavy metal pollution in a water body is enhanced; meanwhile, the nitrogen removal treatment of the sewage with the low C / N ratio is improved through specifically selected auxiliaries, heavy metal chelation and nitrogen and phosphorus removal are synchronously achieved, meanwhile, adsorption of the corrosion and scale inhibitor complexed with metal ions is enhanced through the flocculating agent with a hyperbranched structure and sulfenyl, the corrosion and scale inhibitor is separated from water more easily, migration and diffusion of heavy metal in the environment are reduced, and the service life of the corrosion and scale inhibitor is prolonged. The underground water pollution risk is reduced.

The utility model discloses a wastewater heavy metal chelation precipitation reaction device concretely relates to wastewater treatment technical field, including the sedimentation tank and the silt discharge pipeline, the bottom of the right side of sedimentation tank installs the silt discharge pipeline, and the top inside of sedimentation tank is provided with pretreatment assembly. The utility model discloses be provided with pretreatment pipeline, and the wastewater enters the inside of pretreatment pipeline through sewage inlet pipe, and when staying in the inside of pretreatment pipeline, can add medicine through medicine inlet pipe and handle, after mixing, can start electric push rod, and the auxiliary ring cover slides along the pretreatment pipeline, and after the bottom groove of bottom side opens, can flow into the inside of sedimentation tank through the bottom groove and carry out the precipitation treatment, and the filter screen in the bottom groove can carry out the prefiltration treatment to sewage in this process, and handle the larger sundries in the sewage, realize the pretreatment function of the wastewater heavy metal chelation precipitation reaction device when using.

The invention relates to a heavy metal-resistant selenium-resistant bacterium, a fungicide mixture and a heavy metal contaminated soil remediation method, and belongs to the technical field of microorganisms and soil remediation. The invention discloses an anti-heavy metal selenium-tolerant bacterium HM3, which is Microbacterium oxydans, and the preservation number of the anti-heavy metal selenium-tolerant bacterium HM3 is CGMCC (China General Microbiological Culture Collection Center) No.35476. The efficient synthesis capability of biological nano elemental selenium is realized, and the heavy metal resistance and adsorption capability are realized. When heavy metal contaminated soil is repaired, the nano biological selenium is sprayed to the surfaces of crops and can be chelated with heavy metal to form an indissolvable selenium-heavy metal compound; the microbacterium oxydans applied to the soil can reduce the bioavailability of the heavy metals in the soil environment and reduce the migration of the heavy metals in a soil-crop system by utilizing the adsorption and complexing capabilities on the heavy metals.

The application discloses a preparation method of a heavy metal chelating agent composite material, and the method comprises the following steps: S1, montmorillonite is placed in a dilute acid solution for treatment, and then the montmorillonite is washed, dried, crushed, and ground to obtain montmorillonite powder; S2, polyvinyl acetate is dissolved in a solvent to obtain a blending liquid, the montmorillonite powder is added and stirred uniformly, then ionic monomers and an initiator are added and continuously stirred, and then polyvinylpyrrolidone is added and stirred uniformly; after the stirring is completed, the blending liquid is left to stand, and then the blending liquid is filtered; the obtained product is washed and dried to obtain a modified montmorillonite copolymer composite; S3, the modified montmorillonite is placed in a urea solution for heat treatment, and then the modified montmorillonite is filtered; the obtained product is sequentially washed, freeze-dried, and sieved to obtain the heavy metal chelating agent composite material. The chelating agent composite material can effectively remove heavy metal ions in polluted water.

The present invention relates to the field of flocculant technology, specifically a polyacrylamide flocculant, comprising the following raw materials in parts by weight: 100 parts anionic polyacrylamide, 35-40 parts a first additive, 25-28 parts a second additive, 18-22 parts a powder additive, 15-18 parts a modified zeolite, and 12-14 parts anhydrous ethanol. In the present invention, the first additive is combined with a biomass component via a bamboo-based diatom composite carrier to capture and lock oil droplets in high-viscosity oily wastewater within seconds, significantly shortening the flocculation induction period of traditional processes and improving the flocculant's wastewater treatment efficiency. Furthermore, by adding the second additive, the flocculant system has both demulsification and heavy metal chelation functions, significantly reducing wastewater treatment energy consumption.

The present application belongs to the technical field of ecological remediation of heavy metals in bottom mud, and discloses a device for heavy metal precipitation and solidification test of river and lake bottom mud, which comprises a test tank body, a power supply, a pressing plate, a backwater tank body and an EKG drainage plate, the inner side of the test tank body is provided with a filter screen and a geotextile, the pressing plate and the backwater tank body are provided with EKG plate hole grooves, the EKG drainage plate comprises a cathode and an anode, the EKG drainage plate is provided with a liquid inlet, the test tank body is connected with a water outlet pump and a liquid storage tank, the water outlet pump is connected with a water outlet pipe, the liquid storage tank is communicated with a liquid guide pipe and a liquid inlet pump, and the liquid inlet pump is connected with a liquid inlet pipe; the present application realizes the precipitation and solidification of heavy metals in bottom mud and the continuous drainage of bottom mud by electro-osmosis combined with pre-pressing and heavy metal chelating agents, shortens the precipitation period of heavy metal pollutants and the solidification period of bottom mud, and realizes the efficient precipitation and solidification of heavy metal pollutants in river and lake bottom mud.

The utility model discloses a multi-layer animal pesticide residue purification powder which comprises a biological activity core layer, a heavy metal chelating layer is arranged on the outer side of the biological activity core layer, an organic toxin and pesticide residue toxin decomposition layer is arranged on the outer side of the heavy metal chelating layer, a slow release layer is arranged on the outer side of the organic toxin and pesticide residue toxin decomposition layer, and the slow release layer is arranged on the outer side of the biological activity core layer. An intestinal tract adsorption layer is arranged on the outer side of the slow-release layer, a sugar-coating layer is arranged on the outer side of the intestinal tract adsorption layer, the bioactive core layer, the heavy metal chelating layer, the organic toxin and pesticide residue toxin decomposition layer, the slow-release layer, the intestinal tract adsorption layer and the sugar-coating layer form a multi-layer structure from inside to outside, and the multiple layers are matched. Microbial metabolites, heavy metals, organic toxins and pesticide residue toxins are sequentially treated from inside to outside, and mutual interference of components is avoided; the probiotics on the core layer continuously generate metabolites after colonization in intestinal tracts, so that the animals can discharge heavy metals and toxins.

The present application belongs to the technical field of heavy metal pollution removal, and relates to application of propolis and / or propolis extract in reducing bioavailability and / or toxicity of heavy metals in food. The present application develops a product containing propolis and / or propolis extract for reducing bioavailability and toxicity of lead in food. The propolis and / or propolis extract not only can supplement nutritional elements without side effects, but also has good effect in reducing toxicity, and has wider application prospect compared with traditional chemical heavy metal chelating agents. The propolis and / or propolis extract can reduce bioavailability and / or toxicity of heavy metals in food, and reduce potential health risks of heavy metals to human body. The present application has important significance for reducing and preventing heavy metal hazards of agricultural products.

The present invention relates to a method of heavy metal stabilization in heavy metal contaminated soil, in which “in situ iron oxide synthesis” in which iron chloride hydrate is injected into the heavy metal contaminated soil, and heavy metals to be stabilized are leached into pores, to generate iron oxide in the heavy metal contaminated soil, is repeated multiple times, the in situ iron oxide synthesis is repeated while a predetermined period of rest time is provided between the in situ iron oxide synthesis each time, thereby exhibiting a very excellent heavy metal stormwater leaching reduction effect.

The invention relates to the technical field of household garbage incineration fly ash resource utilization and disposal, and discloses a household garbage incineration fly ash resource utilization and disposal device which comprises a barrel system provided with a stirring shovel part, a pre-washing part and an annotation part, and efficient and harmless disposal of fly ash is achieved through centrifugal driving and mechanical linkage. Specifically, a variable-speed motor is adopted to drive a transmission rod to drive a stirring shovel part to rotate, and the stirring shovel part comprises staggered stirring rods and shovel plates to eliminate stirring dead zones; the pre-washing part is provided with a rotary turbulent flow structure, intermittent quantitative water injection is achieved in cooperation with a centrifugal rotary discharging piece of the annotation part, centrifugal force is used for controlling displacement of a piston to open a drainage channel, washing water is slowly released in batches, and fly ash is prevented from caking when encountering water and having an exothermic reaction. Mechanical centrifugal control, multi-stage stirring and thermal drying technologies are creatively fused, soluble chlorine salt is effectively removed, the strength of a solidified body and the chelating stability of heavy metal are improved, and the problems of uneven mixing, chlorine salt interference and potential safety hazards in a traditional process are solved.

The invention provides a rural sewage treatment process. The rural sewage treatment process comprises the steps of pretreatment, coagulating sedimentation, efficient adsorption, temporary storage of pond water, bottom mud cleaning, bottom mud improvement and ecological restoration. In the efficient adsorption step, by adding a composite adsorbent composed of cellulose-graphene aerogel, a pectin-based heavy metal chelating agent and a charcoal-based nitrogen and phosphorus trapping agent in a specific proportion, synergistic removal of various pollutants such as COD, NH3-N, TP and heavy metal is achieved, and the limitation of a single function is broken through. According to organic matters, ammonia nitrogen, total phosphorus and heavy metals, main pollution types in the sewage are covered, one-stop treatment is realized, the requirement of a multi-stage treatment process is reduced, and the treatment cost is reduced. In the bottom mud improvement step, a bottom mud improver composed of a composite microbial agent and calcium oxide-bentonite-bone glue composite particles in a specific proportion is added, so that multi-target treatment of COD, NH3-N and TP is achieved, and then bottom mud remediation is achieved.

The invention relates to the technical field of waste liquid recovery and treatment, and particularly discloses a DMF waste liquid recovery and treatment process. The DMF waste liquid recovery treatment process comprises the following steps: S1, adding a modified polyethyleneimine adsorbent into the DMF waste liquid in the electronic industry, stirring for reaction, and filtering to obtain residue-free waste liquid; s2, adding a heavy metal chelating agent into the slag-free waste liquid, and stirring for reaction to obtain a mixed liquid containing precipitates; s3, centrifuging the mixed solution, adding anhydrous calcium chloride, standing, and filtering to obtain a purified solution; and feeding the purified liquid into a reduced pressure rectifying tower for rectification, and collecting tower kettle fractions to obtain regenerated DMF. By means of the recycling treatment process, heavy metal ions and organic resin in the DMF waste liquid can be effectively removed, and then DMF can be recycled and reused conveniently.

The present application discloses a star-shaped heavy metal chelator with melamine as the core, and a preparation method and application thereof. Melamine is first reacted with formaldehyde under weak alkaline conditions to generate hexamethylol melamine. Before the hexamethylol melamine is further dehydrated and polycondensed, polyethylene polyamine is added to condense the hydroxymethyl groups with the amino groups or imino groups on the polyethylene polyamine and connect the polyethylene polyamine to the melamine. Then, the product is reacted with carbon disulfide in the presence of alkali to connect the --CSS － groups to the polyethylene polyamine branches, forming a structure with melamine as the core and six polyethylene polyamine branches containing multiple --CSS － groups distributed in a star shape. The product of the present application binds heavy metal ions on the molecule through chelation, and then aggregates and grows into micro-flocs through the connection of the melamine core, thereby significantly improving the chelation binding capacity and flocculation and precipitation performance of the heavy metal ions. The process of the present application is simple, the reaction conditions are mild, the operation is easy to control, the process is environmentally friendly, and the industrial production can be easily realized.

The present invention relates to the technical field of resource utilization and disposal of fly ash from the incineration of domestic waste, and discloses a device for resource utilization and disposal of fly ash from the incineration of domestic waste, including a cylinder system provided with a stirring shovel part, a pre-washing part and an annotation part, which realizes efficient and harmless disposal of fly ash through centrifugal drive and mechanical linkage. Specifically, a variable speed motor is used to drive a transmission rod to rotate the stirring shovel part, and the stirring shovel part includes staggered stirring rods and shovel plates to eliminate the stirring dead zone; the pre-washing part is provided with a rotating turbulence structure, which cooperates with the centrifugal rotary element of the annotation part to realize intermittent quantitative water injection, and uses centrifugal force to control the displacement of the piston to open the drainage channel, and slowly releases the cleaning water in batches to avoid agglomeration and exothermic reaction of fly ash when it encounters water; the present invention innovatively integrates mechanical centrifugal control, multi-stage stirring and thermal drying technology, effectively removes soluble chloride salts, improves the strength of the solid body and the stability of heavy metal chelation, and solves the problems of uneven mixing, chloride salt interference and safety hazards in traditional processes.

This invention provides a slope protection material composed of recycled heavy metal tailings and its preparation method. The material includes: recycled heavy metal tailings treated with a heavy metal chelating agent as a heavy metal ion capture agent, the chelating agent being added at 0.05%–0.2% of the heavy metal tailings weight; recycled heavy metal tailings as aggregate, which is mixed with natural soil to form a base material at a ratio of 1:1.5–2.5; fine aggregate and fine sand, added at 5%–10% of the base material weight; and high-viscosity industrial-grade sodium alginate added as a water-retaining and reinforcing agent, added at 0.5%–2.0% of the base material weight. Additionally, 28% organic matter is added to the base material. The application of this invention effectively solves the problems of ineffective utilization of recycled heavy metal tailings and excessive use of scarce natural soil in existing technologies, and also addresses the issues of weak strength, poor effectiveness in steep slope treatment, and poor stability in existing slope protection materials.

The application provides a deep water layer sewage treatment system and method for river sewage, which comprises a pretreatment interception module, an intelligent precise dosing module, a gradient reaction module, a solid-liquid separation-recovery module and an Internet of Things monitoring and control module; the composition of the medicament used in the intelligent precise dosing module comprises, in parts by weight, 40-85 parts of a conventional flocculant, 2-6 parts of an organic coagulant aid, 12-28 parts of a graphene-chitosan grafted beta-cyclodextrin composite adsorbent, 8-22 parts of a magnetic cerium-bismuth composite nano photocatalyst, 4-12 parts of a heavy metal chelating agent, 18-45 parts of a slow-release carrier, 6-18 parts of an oxidation synergist, 3-9 parts of a pH regulator, 7-15 parts of a biological synergist and 2-6 parts of a bactericide; the modules and components of the medicament in the application synergistically act to efficiently remove suspended particles, organic pollutants, ammonia nitrogen, total phosphorus and heavy metals such as Cr 6+ , Pb 2+ , Cd 2+ , etc. in the deep water layer of river sewage, and improve the precision, automation level and resource recovery rate of sewage treatment.

The invention discloses a process for treating nickel wastewater containing sodium metaaluminate and a heavy metal chelating agent, which comprises primary filtration treatment, primary nickel concentration treatment, secondary nickel concentration treatment, secondary filtration treatment, sodium metaaluminate method treatment, primary solid-liquid separation, polymer chelating precipitation method treatment and secondary solid-liquid separation. Primary concentrated water generated by the primary nickel concentration treatment, secondary concentrated water generated by the secondary nickel concentration treatment and RO concentrated water generated by the RO membrane filtration system are conveyed to a mixing tank, and a mixed solution with high nickel ion concentration is treated by a sodium metaaluminate method; a sodium metaaluminate solution is added, efficient removal of nickel ions is achieved through pH regulation and control, chemical precipitation, adsorption synergy and flocculation, RO produced water and primary treatment water are conveyed to a produced water tank, a mixed solution with low nickel ion concentration is treated through a polymer chelating precipitation method, a heavy metal chelating agent reacts with the remaining nickel ions to form chelate precipitates, and the chelate precipitates are recycled. The double chemical precipitation treatment ensures the efficient removal of nickel ions.

The invention relates to the technical field of waste battery recycling treatment, in particular to a method for recycling a solid electrolyte by using a waste lithium iron phosphate battery and the solid electrolyte. The method comprises the following steps: carrying out acid treatment on positive plate fragments from the waste lithium iron phosphate battery in an acid solution, and then carrying out first solid-liquid separation to obtain an aluminum-containing filtrate and an iron phosphorus slag filter cake; drying the iron-phosphorus slag filter cake to obtain an iron-phosphorus slag dry basis, and carrying out extrusion granulation on the iron-phosphorus slag dry basis and sulfur to obtain a granulated material; carrying out microwave irradiation treatment on the granulation material to obtain a microwave reconstruction product material, sulfur vapor and carbon dioxide; and contacting the microwave reconstruction product material with a complexing agent solution, and then carrying out second solid-liquid separation to obtain a heavy metal chelating solution and a solid electrolyte filter cake. According to the method disclosed by the invention, the waste lithium iron phosphate battery can be efficiently converted into a high-performance solid electrolyte product at low cost.

The present application relates to the technical field of water treatment technology, and discloses a solid composite water purifying agent and a preparation method thereof, which comprises the following components in parts by weight: 20-25 parts of corrosion and scale inhibitor, 0.3-0.6 parts of auxiliary agent, and 0.1-0.4 parts of flocculating agent. The corrosion and scale inhibitor is compounded to broaden the removal range of metal ions and strengthen the removal of heavy metal pollution in water. Meanwhile, the auxiliary agent is selected to improve the denitrification of low C / N ratio sewage, and the chelation of heavy metals and the removal of nitrogen and phosphorus are simultaneously realized. At the same time, the flocculating agent with hyperbranched structure and sulfur group strengthens the adsorption of the corrosion and scale inhibitor with metal ions, so that the corrosion and scale inhibitor is more easily separated from water, the migration and diffusion of heavy metals in the environment are reduced, and the risk of groundwater pollution is reduced.

The application discloses a kind of agricultural product organophosphorus pesticide multi-residue detection kit and preparation method thereof, it is related to detection kit preparation technical field, including: enzyme freeze-dried powder, substrate liquid, color reagent liquid, sample extraction liquid and colorimetric tube.The modified beta-cyclodextrin is added in the substrate liquid, it has stronger molecular inclusion, electrostatic adsorption and heavy metal chelating multiple capacity, can efficiently shield endogenous interference impurities in onion and garlic agricultural products, significantly reduce the probability of false positive occurrence during detection, while can protect the structure of detection substrate, inhibit substrate from self-hydrolysis metamorphic, improve reagent long-term storage stability, effectively resist external interference, such as heavy metal, fundamentally improve the detection accuracy and anti-interference ability of kit;Modified tetradecyl sulfobetaine is added in color reagent liquid, which can improve the sensitivity of pesticide detection kit, can stabilize the color reaction system, inhibit the oxidation of color product and fade, and greatly reduce the light value drift after standing.

The invention discloses a high-temperature and high-acid stable heavy metal chelating agent as well as a preparation method and application thereof, and belongs to the field of industrial wastewater treatment. The preparation method comprises the following steps: condensing 2, 6-diaminopyridine and o-phenylenediamine which are used as raw materials to obtain 2, 6-bis (benzimidazole-2-yl) pyridine; nitration and reduction are carried out, and amino groups are introduced; carrying out amidation reaction on the amination intermediate and 2-mercaptobenzothiazole-5-carboxylic acid, and introducing a thiol group; and carrying out nucleophilic substitution reaction on the obtained intermediate and bromohexadecane, and grafting a hydrophobic long chain to finally prepare the target chelating agent. Molecules of the chelating agent integrate a rigid heterocyclic ring, a thiol ligand and a hydrophobic chain, so that the chelating agent not only can efficiently and selectively chelate heavy metal ions under the conditions of high temperature and strong acid, but also can spontaneously gather after chelating and quickly settle through gravity to realize efficient solid-liquid separation, and has a wide application prospect.

The invention provides an iron ore tailing slag repairing method based on plant planting, and belongs to the technical field of tailing slag repairing. After the tailing slag is crushed, mixed and activated, a composite passivation layer is formed; according to the method, heavy metal chelating bacteria are concentrated in a pollution core area to efficiently passivate toxic substances, growth-promoting bacteria are focused in a nutrient absorption area to enhance the metabolic activity of plants, and mycorrhizal fungi further expand a moisture transport channel to form a remediation unit with clear spatial division of labor. The zoning cooperation mode not only avoids flora competition loss of traditional mixed inoculation, but also integrates physical barrier, chemical passivation and biological enrichment effects of heavy metals into a synergistic remediation chain through deep symbiosis of microorganisms and plants, and greatly shortens the migration and transformation period of pollutants.