258 results about "Calcium peroxide" patented technology

The invention discloses a phosphorus removal filler and a preparation method and application thereof, and belongs to the technical field of fillers. Sulphoaluminate cement, chitosan, sodium alginate and calcium peroxide are uniformly mixed in a nitric acid solution in an amino-containing coupling agent, then foaming and pore forming are performed under steam, and the phosphorus removal filler is prepared. And finally, uniformly mixing with titanium dioxide, sodium silicate, a ferrous sulfate solution and sodium borohydride to obtain the phosphorus removal filler with an excellent phosphorus removal effect, and the phosphorus removal filler has a rich pore structure and adsorption activity, can sufficiently perform physical adsorption on phosphorus elements, and has a good phosphorus removal effect. Meanwhile, the phosphorus removal filler further has excellent surface complexing activity and photocatalysis, insoluble salt precipitates can be generated through reaction of iron elements and calcium elements and phosphate in water, so that total phosphorus is removed, the material is ground after adsorption saturation and put into a fish pond to serve as a phosphorus supplementing material, resource recycling can be achieved, and the cost is reduced. Wide application prospects are realized.

The invention relates to a Fenton-like functional filler which is prepared from 10-20% of iron particles coated with a carbonized film, 10-20% of aluminum sulfate modified straw, 20-30% of PBAT-coated calcium peroxide, 20-30% of diatomite and 10-30% of an adhesive. A processing method of a Fenton-like functional filler comprises the following steps: uniformly mixing iron particles coated with a carbonized film, aluminum sulfate modified straws, PBAT-coated calcium peroxide and diatomite, then adding an adhesive, mixing isocyanate serving as the adhesive with polyol according to a volume ratio of 1: 5, and continuously and uniformly mixing; then the mixed raw materials are injected into a mold coated with a release agent in advance, the mold temperature ranges from 40 DEG C to 60 DEG C, the foaming curing time ranges from 15 min to 20 min, and the Fenton-like functional filler can be obtained. The invention relates to an application of a Fenton-like functional filler in constructed wetlands. The method has the beneficial effects that the method is not influenced by temperature, and the removal effect of the constructed wetland on nitrate nitrogen and refractory COD (Chemical Oxygen Demand) can be obviously enhanced.

The invention provides a potassic salt ore old brine-tail salt full-recycling cemented filling process based on magnesium-calcium synergistic conversion, and belongs to the field of potassic salt ore goaf filling, CaO is added into old brine for reaction to obtain Mg (OH) 2 / Ca (OH) 2 mixed precipitate, then a dispersing agent is added, and solid-liquid separation is performed to obtain a solid mixture and a post-reaction mother solution; dividing the tail salt into particle sizes gt according to particle sizes; the method comprises the following steps: mechanically grinding coarse tail salt with the particle size of 75 microns and fine tail salt with the particle size of less than or equal to 75 microns until the particle size lt is reached; filtering to obtain activated crude tail salt; mixing the fine tail salt with an exciting agent, and activating through ball milling to obtain activated fine tail salt; and mixing the activated crude tail salt, the activated fine tail salt, the solid mixture and the reacted mother liquor, adding a retarder and a water reducing agent, stirring to obtain filling slurry, and pumping the filling slurry into a well for filling in multiple layers. According to the method, Mg < 2 + > in old brine is directionally converted through calcium oxide to generate a Mg (OH) 2 / Ca (OH) 2 gelling phase, and a low-cost and high-strength filling system is formed by combining a tail salt grading activation technology.

The invention belongs to the technical field of biochar oxygen-releasing materials, and particularly relates to a biochar-based oxygen-releasing material for gleying soil improvement as well as a preparation method and application of the biochar-based oxygen-releasing material. The biochar-based oxygen release material is a CaO2 at phosphorus-rich biochar material obtained by taking modified phosphorus-rich biochar as a carrier and combining with calcium peroxide, and has remarkable beneficial effects in the field of gleying rice field improvement. According to the biochar-based oxygen release material, the mass fraction of calcium peroxide is remarkably increased, so that the oxygen release function of the material is enhanced, and the biochar-based oxygen release material has important significance for improving the ventilation condition of a rice field and promoting the growth of a rice root system. In the preparation process, raw materials such as dimethylbenzene and polyethylene which may cause soil pollution and ecological problems are avoided, and the environment-friendly concept is embodied. Meanwhile, the modified biochar not only serves as a carrier to improve the loading capacity of calcium peroxide, but also has the function of releasing a phosphate fertilizer, and is beneficial to improvement of the soil fertility of the rice field and increase of the rice yield.

The invention discloses a rice seed pelleting agent with the effects of promoting rice seedling strengthening and cold and waterlogging resistance in the bud stage, and belongs to the technical field of seed pelleting. The rice seed pelleting agent comprises an adhesive, an inert filling substance and a specific substance. Wherein the adhesive is 20% Arabic gum, the inert filling substance is bentonite, talcum powder and clay in a ratio of 1: 6: 3, the weight ratio of the inert filling substance to the rice is 2: 1, the active components comprise charcoal and calcium peroxide, the weight ratio of the charcoal to the naked rice seeds is (0.2-0.4): 1, and the weight ratio of the calcium peroxide to the naked rice seeds is (0.6-0.8): 1. The pelleting agent can promote rice seed germination and seedling establishment and enhance the stress resistance of rice.

The invention relates to the technical field of sewage treatment, in particular to a method for improving the denitrification nitrogen removal performance of a corn or rice straw fermentation carbon source by using industrial glucose. According to the method, the straws are soaked and pretreated by adopting calcium peroxide, and meanwhile, in the anaerobic fermentation process, the anaerobic condition is kept through nitrogen, and zero-valent iron is added to obtain the straw fermentation liquor. Fermentation liquor and industrial glucose are mixed to serve as a composite carbon source, the activity of microorganisms in a sludge system is stimulated through the usability of the glucose, and the utilization rate of the microorganisms to the rice and corn fermentation liquor carbon source is increased; anaerobic fermentation conditions of rice and corn straws are optimized, the carbon source release rate is increased, the complexity of carbon source composition of fermentation liquor is utilized, the diversity of microorganisms is improved, excessive propagation of the microorganisms is avoided, and the biological denitrification capacity is improved. The method disclosed by the invention is beneficial to resource utilization of agricultural wastes, reduces the biological denitrification cost of sewage with a low carbon-nitrogen ratio, and promotes green and low-carbon development of sewage treatment.

The invention discloses a composite conditioner for acid soil of slope cropland and application of the composite conditioner. The conditioner comprises the following components in percentage by mass: 12%-18% of calcium peroxide, 18%-32% of a buffer mineral compound, 1.5%-3.0% of an anti-scouring controlled-release material, 10%-25% of a nutrient carrier and fertilizer, 0.5%-3.0% of a binder and a granulation aid, and the balance of inert filler and water. The preparation process comprises the steps of dry mixing, granulation, drying and coating. The product provided by the invention can realize high residue of CaO and stable pH under the condition of heavy rainfall of slope cropland, effectively inhibit the pH fall of acid soil, reduce aluminum toxicity and reduce nutrient loss. By controlling the content and proportion of the calcium peroxide, the buffer mineral compound and the anti-scouring controlled-release material, the calcium peroxide, the buffer mineral compound and the anti-scouring controlled-release material have a synergistic effect in a slope cropland environment, so that not only is the initial rapid acid inhibition capability ensured, but also the lasting pH stability and high residual rate are realized through buffer and controlled-release technologies.

The invention discloses a slow-release phosphorus removal material and a preparation method and application thereof, and belongs to the technical field of sewage treatment, the slow-release phosphorus removal material comprises the following components by mass: 40-55 parts of calcium peroxide, 25-35 parts of a binder, 2-5 parts of bentonite, 5-20 parts of calcined oyster shell powder, and 10-25 parts of iron-loaded modified red soil; the binder is prepared from Portland cement, polyacrylic acid and hydroxypropyl methyl cellulose ether according to the mass ratio of 1: (0.2 to 1): (0.1 to 0.8). Under the synergistic effect of the calcium peroxide, the binder, the bentonite, the calcined oyster shell powder and the iron-loaded modified red soil, the filter material can be used as a phosphorus removal filter material, can be directly used as a filter material of a filter tank, a wetland and the like independently or in combination with quartz sand, gravel and other filter bed filter materials, can permanently remove phosphorus in surface water, can also be directly put into rivers, lakes and ponds, and can be used as a filter material of a filter tank, a wetland and the like. In addition, the preparation cost is low, and wide application prospects are achieved.

The invention belongs to the technical field of urban water environment treatment and restoration, and discloses a method for improving the micro-ecological environment of bottom mud of an urban black and odorous river. The method specifically comprises the following steps that 1, calcium nitrate with the amount 1.6-1.8 times of theoretical calculation amount is added according to the AVS content in the black and odorous bottom mud to be repaired; 2, after the calcium nitrate reacts, calcium peroxide (CaO2) with the amount 1.3-2.0 times of the theoretical calculation amount is added. According to different reaction processes of AVS and ferrous iron in the black and odorous bottom mud and different oxidation capacities of calcium nitrate and CaO2, calcium nitrate is added firstly, and then CaO2 is added, so that removal of ferrous iron, AVS and organic matters in the black and odorous bottom mud is enhanced, chemical agents are scientifically and efficiently used, and the micro-ecological environment of the black and odorous bottom mud is continuously and effectively improved.

The invention relates to a Fenton-like oxidation treatment method, in particular to application of a self-activated Fenton-like composite repair material, the composite repair material is CaO2 (at) Fe3O4 (at) BIP-BC, western blot biochar is used as a matrix, and magnetite and calcium peroxide are sequentially loaded on the surface of the matrix. Compared with the prior art, the method has the advantages that the high efficiency and the long-term effect of Fenton-like are improved through biochar surface active groups and calcium peroxide, the selectivity of removing target harmful bacteria and harmful bacteria genes is improved through western blot, and the activating agent and the oxidizing agent are added at the same time, so that the use cost and the operation complexity are reduced. According to the method, the defects that traditional Fenton-like oxidation treatment is poor in harmful bacterium and harmful bacterium gene obligate removal effect, short in treatment time, high in required dosage and serious in secondary pollution, and an activating agent and an oxidizing agent need to be used separately are effectively overcome; the efficient and long-acting remediation of soil and water bodies polluted by harmful bacteria and harmful bacteria genes through the Fenton-like reaction is realized.

The invention belongs to the technical field of environmental treatment, and particularly relates to a combined treatment method for polluted soil and carbon emission reduction and a system utilizing the combined treatment method. The polluted soil and carbon emission reduction combined treatment method provided by the invention comprises the following steps: sequentially filling a reaction tower with a mixture of polluted soil, calcium peroxide and slag, a first mixture of the polluted soil and the calcium peroxide and a second mixture of the polluted soil and the calcium peroxide from bottom to top; the reaction tower filled with the filler is obtained; the content of calcium peroxide in the second mixture is higher than that of the first mixture; activating the filler in the reaction tower filled with the filler so as to decompose organic pollutants in the polluted soil, and then introducing waste gas containing carbon dioxide to perform carbon immobilization, so as to respectively obtain purified soil and purified waste gas; the activating treatment mode comprises the step of introducing steam into the reaction tower. The synergistic interaction of soil pollutant removal and carbon immobilization is achieved, industrial waste heat and waste are fully utilized, and the resource utilization rate is increased.

The invention is applicable to the technical field of hydrogel, and provides dynamic cross-linked hydrogel and a preparation method and application thereof, and the preparation method comprises the following steps: cross-linking oxidized dextran and carboxymethyl chitosan containing phenylboronic acid modification groups; glucanase is added before the hydrogel is formed, and calcium peroxide nanoparticles coated with polydopamine are introduced; wherein the mass concentration of the oxidized dextran is 2-10% w / v, the mass concentration of the carboxymethyl chitosan containing the phenylboronic acid modified group is 2% w / v, the concentration of the glucanase is 10-100 U, and the concentration of the calcium peroxide nanoparticles coated with the polydopamine is 0.1-1% w / v. The hydrogel disclosed by the invention shows good cell compatibility, angiogenesis promoting capability and bioactivity for promoting dental pulp regeneration in multiple in-vitro and in-vivo experiments, is suitable for tissue engineering fields such as dental pulp injury repair and the like, and effectively solves the technical problem that conventional hydrogel is insufficient in cell survival support in three-dimensional culture and the like.

The invention provides a preparation method of 1, 3-propane sultone, which comprises the following steps: introducing an allyl alcohol aqueous solution, a sodium hydroxide aqueous solution, sulfur dioxide and a slow-release peroxide into a continuous fluid reactor, reacting to obtain a 3-hydroxy propane sodium sulfonate crude product, acidifying the crude product to obtain 3-hydroxy propane sulfonic acid, concentrating to remove water, separating out salt by using methanol, and filtering to obtain 1, 3-propane sultone. And finally carrying out reduced pressure distillation on the filtrate to obtain 1, 3-PS. The slow-release peroxide is used for replacing conventional hydrogen peroxide or benzoyl peroxide to serve as an initiator, the preparation process conditions of the slow-release peroxide are controlled, calcium peroxide is embedded through stearic acid firstly, then surface modification polydopamine is subjected to secondary embedding, and the slow-release peroxide of a special structure is obtained; the selectivity of the 3-hydroxypropane sodium sulfonate is obviously improved while the reaction efficiency is not excessively influenced, and the method has industrial advantages.

The invention provides a temperature-increasing oxygen-increasing agent for waterlogging type medium and low yield fields and a preparation method of the temperature-increasing oxygen-increasing agent. The temperature-increasing oxygen-increasing agent is prepared from the following raw materials in parts by weight: 80 to 130 parts of tea seed cakes, 80 to 110 parts of aged chicken manure, 140 to 180 parts of straw powder, 7.7 to 10 parts of beneficial bacteria, 0.3 to 0.8 part of alginate oligosaccharide, 9.5 to 12 parts of silicon-calcium-magnesium ore powder, 200 to 220 parts of activated humic acid and 340 to 430 parts of calcium peroxide. The fertilizer has comprehensive nutrients, can effectively improve the utilization rate of the fertilizer, improve the soil structure and promote production and income increase, takes organic matters as a carrier, is added with a large amount of activated humic acid and silico-calcium-magnesium ore powder, has strong chelating ability, promotes the formation of soil aggregates and improves the absorption and utilization rate of plant nutrients, and has good application prospects through a unique coating technology. The active ingredients and the granulation rate of the product are effectively improved.

Provided is a method for decomposing polycyclic aromatic hydrocarbons using a complex decomposition bacterial consortium. [Solution] A method for decomposing polycyclic aromatic hydrocarbons using a decomposition bacterial flora complex is disclosed, which includes the following steps: first, decomposition bacterial flora is added to organic-contaminated water and allowed to react for 1 to 48 hours; then, a pre-complex is added and allowed to react continuously until the total time reaches 72 hours, so that the decomposition bacterial flora and the pre-complex form a complex system; this process can avoid the adverse effects of the pre-complex on the decomposition bacterial flora and successfully achieve decomposition; the present invention adds a decomposition bacterial flora and a pre-complex of calcium peroxide and ferrous sulfate heptahydrate as a complex system to polycyclic aromatic hydrocarbon-contaminated water, and can effectively remove polycyclic aromatic hydrocarbons through the decomposition reaction; compared with conventional microbial purification and oxidative purification, this method is efficient, environmentally friendly and has high applicability.

The invention discloses a temperature-controlled anti-inflammatory and antibacterial skin wound dressing capable of promoting revascularization and a preparation method and application thereof, and relates to the technical field of medical materials, the preparation method comprises the following steps: S1, preparing calcium peroxide microspheres; s2, the poloxamer 407, the chitosan and the forsythiaside A are jointly dissolved in an acetic acid solution, and mixed gel is obtained; s3, dispersing calcium peroxide microspheres into the mixed gel to obtain the skin wound dressing capable of controlling temperature, resisting inflammation and bacteria and promoting revascularization. The traditional Chinese medicine active ingredient forsythiaside A is loaded, so that the healing efficiency of diabetic wounds is improved; due to the temperature-sensitive property of the gel, the gel can be better attached to the wound, the antibacterial property can inhibit microorganism breeding at the wound surface, the oxygen release capacity can improve the anoxic environment at the wound, and the loaded traditional Chinese medicine active ingredient forsythiaside A has the anti-inflammatory capacity, promotes cell regeneration at the wound and accelerates the repair process.

The invention belongs to the technical field of biochar oxygen release materials, and particularly relates to a carbon-based calcium peroxide material with an oxygen slow release function as well as a preparation method and application of the carbon-based calcium peroxide material. Silicon-rich agricultural wastes are converted into biochar through controllable pyrolysis, mesoporous biochar is prepared by regulating and controlling the pore structure of the biochar, phosphorus-rich biochar is prepared by combining phosphate modification, and finally, the carbon-based calcium peroxide material with the slow-release oxygen function is obtained by compounding the phosphorus-rich biochar with calcium peroxide. Oxygen can be continuously and stably released into the soil, and meanwhile, the phosphorus-rich biochar can also provide phosphorus nutrients to promote the growth of the rice. The material can be widely applied to improvement of gleying rice fields, effectively solves the problem of soil anoxia, improves soil fertility and rice yield, and has the characteristics of environmental protection, economy and high efficiency.

The invention relates to the technical field of seed treatment, and provides a pelleting method for alfalfa seeds used in a coastal saline-alkali district, and the alfalfa seeds sequentially comprise seeds, a hormone layer, a first oxygenation breathable layer, a nutrition layer, a second oxygenation breathable layer and an outer protection layer from inside to outside; the raw material of the hormone layer comprises gibberellin; the raw materials of the first oxygen-increasing breathable layer comprise an adhesive and a functional material; the raw material of the second oxygenation breathable layer comprises a functional material; the functional material comprises gypsum and / or calcium peroxide; the raw material of the outer protection layer comprises organic acid. By means of the technical scheme, the problem that the emergence rate of alfalfa seeds is low due to the fact that saline-alkali soil in a saline-alkali area is large in viscosity and poor in air permeability in the prior art is solved.

The present application belongs to the technical field of biochar oxygen-releasing materials, and particularly relates to a carbon-based calcium peroxide material with oxygen-releasing function, a preparation method and application thereof. Silicon-rich agricultural waste is converted into biochar through controllable pyrolysis, the pore structure of the biochar is regulated, mesoporous biochar is prepared, the mesoporous biochar is modified by phosphates to prepare phosphorus-rich biochar, and finally, the phosphorus-rich biochar is combined with calcium peroxide to obtain the carbon-based calcium peroxide material with oxygen-releasing function. The material has excellent oxygen-releasing performance and can continuously and stably release oxygen into the soil. Meanwhile, the phosphorus-rich biochar can also provide phosphorus nutrients to promote the growth of rice. The material can be widely applied to the improvement of gleyed paddy fields, effectively solves the problem of soil oxygen deficiency, improves soil fertility and rice yield, and has the characteristics of environmental protection, economy and high efficiency.

The invention provides core-shell structure nanoparticles with a mediated microenvironment for rheumatoid arthritis treatment and a preparation method thereof.The preparation method comprises the steps that a calcium peroxide precursor is dissolved in absolute ethyl alcohol containing a surfactant, and calcium peroxide nanoparticles are obtained by adding an ammonia water solution and a hydrogen peroxide solution; the preparation method comprises the following steps: carrying out surface treatment on calcium peroxide nanoparticles by using tannic acid to form a tannic acid molecular layer on the surfaces of the calcium peroxide nanoparticles so as to obtain tannic acid modified calcium peroxide nanoparticles; and forming a metal phenolic network shell on the surface of the tannic acid modified calcium peroxide nano-particle by using cerium acetate to obtain the core-shell structure nano-particle.

The invention relates to a Fenton-like composite material, in particular to a self-activated Fenton-like composite repair material as well as a preparation method and application thereof, the composite repair material is CaO2 (at) Fe3O4 (at) BIP-BC, western blot biochar is taken as a matrix, and magnetite serving as an activating agent and calcium peroxide serving as a slow-release oxidizing agent are sequentially loaded on the surface. Compared with the prior art, the method has the advantages that the efficiency and the long-term effect of Fenton-like are improved through the biochar surface active groups and the calcium peroxide, the selectivity of removing target harmful bacteria and harmful bacteria genes is improved through western blot, and the biochar loads the calcium peroxide and the magnetite at the same time, so that an activating agent and an oxidizing agent are added at the same time; and the use cost and the operation complexity are reduced. The method overcomes the defects that the traditional Fenton-like oxidation treatment has poor obligate removal effect on harmful bacteria and harmful bacteria genes in the environment, the treatment time is short, the required dosage is high, the secondary pollution is serious, and an activating agent and an oxidizing agent need to be used separately.

The invention provides a near-infrared light mediated hybrid hydrogel multi-bioactivity synergistic tissue repair promoting material as well as a preparation method and application thereof, and relates to the technical field of biological materials. The method comprises the following steps: 1) dispersing calcium peroxide in a solvent, and adding a 3-hydroxytyramine hydrochloride solution for reaction to obtain CaO2 (at) PDA nanoparticles; enabling the CaO2 (at) PDA nano-particles to react with a catalase solution, so as to obtain ORN oxygen release particles; (2) mixing the ORN oxygen release particles with the surfaces rich in sulfydryl with Se-NPs with the surfaces rich in selenol after reduction treatment under the protection of inert atmosphere to obtain ORN-coated Se composite particles; the preparation method comprises the following steps: dissolving hyaluronic acid methacrylate in deionized water, adding the ORN-coated Se composite particles, uniformly mixing, adding a photoinitiator, and carrying out ultraviolet curing to obtain the ORN-coated Se-HAMA hydrogel which can realize local response oxygen supply on an anoxic wound surface and has antibacterial and antioxidant characteristics.

The invention discloses a high-sulfur iron ore concentrate pellet desulfurizing agent and a method for strengthening high-sulfur iron ore concentrate pellet desulfurization, and belongs to the technical field of iron ore pellet production. The high-sulfur iron ore concentrate pellet desulfurizing agent comprises calcium peroxide powder, direct reduction iron powder dust and manganese dioxide powder, the desulfurizing agent participates in pyrite-containing iron ore pelletizing, obtained green pellets are sequentially subjected to forced air drying, preheating and roasting, and finished pellets are obtained. According to the method, the desulfurization efficiency of the high-sulfur iron ore concentrate pellets in the drying and preheating process can be remarkably improved through the desulfurizer, and meanwhile the technical problem that the pellet strength is reduced due to the fact that a large amount of SO2 is adsorbed when the pellets are dried and sulfate shells are formed on the surfaces of the pellets can be solved by removing air draft drying. The method is simple to operate, low in production cost and environment-friendly, and meets the requirements of industrial production.

The invention provides an exosome freeze-drying protective dressing and a preparation method thereof, and belongs to the technical field of dressings. Mixing a protective agent and the exosome, and embedding the mixture in a chitosan-sodium tripolyphosphate microcapsule to obtain an embedded exosome; the preparation method comprises the following steps: adding an extracellular matrix modified by MXene and graphene, calcium peroxide microspheres and an embedded exosome into a poly (alpha, beta-aspartic hydrazide)-C16 copolymer-silver hydrogel, and carrying out freeze drying to obtain the exosome freeze-drying protective dressing, wherein the extracellular matrix modified by MXene and graphene, the calcium peroxide microspheres and the embedded exosome are added into the poly (alpha, beta-aspartic hydrazide)-C16 copolymer-silver hydrogel; the prepared exosome freeze-dried protective dressing has good biocompatibility, can rapidly promote wound healing, reduce inflammatory response of wounds, play antibacterial and bacteriostatic effects and avoid wound deterioration, is convenient to store and transport, still has good activity after long-term storage, and has wide application prospects in the field of rapid wound healing.

The invention discloses a vinylene carbonate production waste treatment method, which comprises: dispersing triethylamine hydrochloride waste residue in water, filtering, adding excess alkali into the filtrate to carry out an alkaline hydrolysis reaction, and standing for layering to obtain an oil phase and a water phase, the oil phase containing triethylamine; adding calcium peroxide into the water phase, mixing and stirring to obtain a pretreatment solution; performing electrochemical catalytic oxidation treatment on the pretreatment solution, wherein a graphite felt electrode modified by a specific iron-based activated carbon catalyst is used as a cathode in the electrochemical catalytic oxidation treatment; the method is simple to operate, easy to implement, high in continuity, low in cost, free of high-temperature and high-pressure processes and excellent in treatment effect.

The invention provides a composite flocculant, and relates to the technical field of wastewater treatment. The composite flocculant is prepared from chitosan and humate, heavy metal cadmium and arsenic are removed, the sludge volume is reduced, a method for synchronously removing cadmium and arsenic in acid mine wastewater is provided, thorough removal of cadmium and arsenic is achieved through the synergistic effect of calcium peroxide, the diatomite adsorbent and the composite flocculant, and the service life of the composite flocculant is prolonged. The mass and volume of the sludge are reduced, the wastewater treatment cost is reduced, and the method is a rapid, economic and efficient environment-friendly treatment scheme for the acid mine wastewater.

The invention relates to the technical field of environmental restoration, and discloses a calcium carbonate coated calcium peroxide slow-release nano material as well as a preparation method and application thereof. The slow-release nano material comprises calcium peroxide and calcium carbonate and is of a core-shell structure, an inner core layer is calcium peroxide, and a shell is calcium carbonate; the preparation method comprises the following steps: continuously stirring a calcium peroxide suspension for 5-60 minutes in a normal-temperature normal-pressure and open system to spontaneously finish calcium carbonate coating without using other materials or chemical reagents. The calcium carbonate shell in the slow-release nano material provided by the invention not only enables calcium peroxide to realize H2O2 slow release, but also widens the pH application range of the material to 3.0-11.0. Compared with the prior art, the method is extremely simple in preparation process, low in cost, green, environmentally friendly and suitable for in-situ chemical oxidation repair of organic matter polluted sites.

The invention discloses a calcium-based composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: cleaning and drying high-porosity straw biomass charcoal particles; mixing the biochar particles with calcium peroxide, and enabling the powdery calcium peroxide to enter pores of the biochar through vibration to obtain the biochar loaded with the calcium peroxide; mixing the calcium peroxide-loaded biochar particles and calcium hydroxide-containing minerals according to a certain proportion to obtain a calcium-based composite material; the calcium-based composite material is added into dried sludge, the adding amount accounts for 5-15 wt.% of the dry basis mass of the sludge, then a lignin binder is added, compression molding is performed, the calcium-based composite material is added in the pyrolysis process, the sulfur fixation rate can be larger than 60%, most of nitrogen is converted into ammonia, hydrogen cyanide is greatly reduced, synergistic sulfur fixation and nitrogen control in sludge pyrolysis are achieved, and the sulfur fixation and nitrogen control efficiency is improved. And the emission of pollution gas is reduced.

The invention relates to a composite drug-loaded nano particle based on a calcium peroxide carrier, which is a composite drug-loaded nano particle CaO2 (at) HA / pllCe6 formed by loading polylysine-chlorin e6 (pllCe6) on the surface of a calcium peroxide nano particle modified by hyaluronic acid serving as a carrier, and the composite drug-loaded nano particle is a spherical particle with the particle size of about 100nm. Ce6 is converted into plCe6 through polylysine modification, then the plCe6 is compounded with hyaluronic acid modified calcium peroxide nanoparticles, the plCe6 is uniformly loaded on the surface of the plCe6, the self-oxygen-supply composite nano drug-loaded particle CaO2 (at) HA / plCe6 is formed, the problem that Ce6 cannot be attached to the surface of CaO2 nanoparticles is solved, the prepared nano composite particle is uniform in particle size and high in specific surface area, and after plCe6 and CaO2 (at) HA are compounded, the self-oxygen-supply composite nano drug-loaded particle has a good drug-loading effect. As a good bacterial microenvironment response material, the material can improve the hypoxia condition of bacterial parts and enhance photodynamic therapy; on the other hand, the biocompatibility and the delivery efficiency of Ce6 are improved, so that a remarkable bactericidal effect is achieved at a low dosage.

The application discloses a kind of organic waste composting methods for reducing nitrogen loss, belong to the technical field of organic waste resource utilization, in different stages of organic waste fermentation, calcium peroxide is added, on the one hand, can maintain the oxygen environment of heap system, inhibit denitrification;On the other hand, by regulating the pH environment in system, reduce ammonia volatilization.This double synergistic effect, continue to increase efficiency in the whole composting fermentation process, oxygen regulation breaks down the gaseous nitrogen loss caused by denitrification from the root, pH regulation effectively inhibits free ammonia volatilization, the two effects cooperate with each other, throughout the whole process, can realize the efficient nitrogen conservation of organic waste raw materials from fermentation start to stable decomposition, effectively solve the problems that existing nitrogen conservation technology is not good, cost is high, easy to cause secondary pollution and affect composting maturity etc..