86 results about "Organic arsenic" patented technology

The invention relates to a determination method for inorganic arsenic in aquatic products. After being extracted by hydrochloric acid solution, the inorganic arsenic (1plus1) in the aquatic products passes through an anion-exchange column, and arsenite As (III), dimethyl arsenic compound DMA, methyl arsenic compound MMA and arsenate As (V) are eluted sequentially by mobile phase; owing to different adsorption capacities of the anion-exchange column on the arsenate As (V), the arsenite As (III), the methyl arsenic compound MMA, the dimethyl arsenic compound DMA and arsenic sugar AsS, the eluted solution is hydrogenated by borohydride potassium reducing agent and hydrochloride, and hydride is generated, enters an atomizer, and is subject to analytic determination by being combined with atomic fluorescence. The experimental condition is reasonably selected, and the detecting data is accurate and reliable and can not be influenced by extraction time and temperature. The determination method of inorganic arsenic in aquatic products of the invention not only can detect the inorganic arsenic iAs accurately, but also can determine the methyl arsenic compound MMA and the dimethyl arsenic compound DMA of the organic arsenic, and can be used for the morphometry of the arsenic in the aquatic products.

The invention discloses a method for treating arsenic-containing wastewater by using a multiphase Fenton system based on iron oxide. The method is characterized in that firstly, the pH of the arsenic-containing wastewater is adjusted to range from 2.0 to 9.0, then an iron oxide catalyst and a hydrogen peroxide oxidizing agent are added, so that an organic arsenic compound completes form transformation from organic arsenic to inorganic arsenic in the multiphase Fenton system based on the iron oxide, meanwhile, released inorganic arsenic forms Fe-As chemical coordinate bonds through binding state iron central atoms on the surface of the iron oxide to be effectively adsorbed, and the arsenic pollutant in the arsenic-containing wastewater is removed. Degradation from organic arsenic to inorganic arsenic and adsorption of the inorganic arsenic can be finished simultaneously in one step, the iron oxide serves as an efficient adsorption material of the inorganic arsenic as well as a Fenton reaction catalyst for degrading the organic arsenic to the inorganic arsenic, and the treatment cost of the organic arsenic wastewater is effectively reduced while the reaction efficiency and the operation simplicity are greatly improved.

The invention provides a harmless treatment process of a arsenious waste chemical, comprising the following steps of: (1) mixing an arsenious waste with water, adding ferric salt or ferrous salt, then regulating the pH value of a solution to be less than 2 through use of nitric acid, and then adding hydrogen peroxide to completely convert organic arsenic and tervalent As which are contained in a reaction system into AsO4<2-> and completely convert Fe<2+> into Fe3+ at the same time; (2) regulating the pH value of the solution obtained from the step (1) to 9-10 through use of calcium hydroxide to form an arsenic-ferric complex precipitation; and (3) adding cement to the arsenic-ferric complex precipitation and waste liquor which are generated in the step (2) for solidification treatment so as to obtain a cement solidified body. According to the harmless treatment process provided by the invention, a chemical treatment technology and a cement solidification technology are organically combined into a whole; and the leaching toxicity concentration of arsenic contained in the obtained cement solidified body is less than 5 mg/L and reaches the national standard related to harmlessness.

The invention discloses an on-line monitoring device for total arsenic in water quality. The on-line monitoring device comprises an embedded control system and a sampling pump system, a quantifying system, a multi-channel sample injection system, an expelling system and an absorbing and detecting system which are in sequential pipeline connection, wherein a control program is preset in the embedded control system and is used for controlling the sampling pump system, the quantifying system, the multi-channel sample injection system, the expelling system and the absorbing and detecting system to work; after the sampling pump system and the quantifying system carry out rational sampling, a reagent and a water sample to be tested are enabled to enter the expelling system through the multi-channel sample injection system and are subjected to oxidation reduction chemical reaction in the expelling system for unifying arsenics in various morphologies such as inorganic arsenic and organic arsenic into gaseous arsenide in one valence state; total arsenic subjected to chemical reaction is completely expelled and transferred to the absorbing and detecting system; the gaseous arsenide is absorbed and on-line detection for the total arsenic is carried out in the absorbing and detecting system; and the problem that the accuracy is influenced due to interference of water sample background is solved, the measuring accuracy is greatly improved and the application range for monitoring is widened.

The invention discloses a method for removing organic arsenic in cultivation wastewater by anaerobic granular sludge, which comprises the steps of: intensifying the anaerobic granular sludge by FeSO4; feeding roxarsone or arsanilic acid-containing cultivation wastewater into the intensified anaerobic granular sludge; controlling the temperature in an arsenic reactor at 25-35DEG C, the hydraulic retention time for 12-60h, and the PH value of solution in the reactor at 6.0-8.0; and running a rector till that the concentration of roxarsone or arsanilic acid in the water discharged out of the reactor is reduced to be less than 50mug/L so as to obtain the acclimatized anaerobic granular sludge. The organic arsenic-containing cultivation wastewater is treated by the acclimatized anaerobic granular sludge, so that the method is high in organic arsenic removing efficiency, and the arsenic content in the discharged water achieves the discharge standard. The method has the advantages of being wide in raw material sources, simple in preparation, and low in cost.

A drug eluting stent for promoting endothelium repairing and preventing restenosis relates to a reticular drug eluting stent. The invention solves the problem that the current drug eluting stents cannot effectively prevent the restenosis and thrombus in the stent at the same time. The drug eluting stent of the invention consists of a stent matrix, a middle layer and an antibody coating from inside to outside; the middle layer at least consists of a drug layer consisting of one or several of arsenous oxide, tetra-arsenic hexoxide and organic arsenic; the antibody coating is an antibody capable of capturing endothelia1 progenitor cells. The middle layer also includes at least a control release layer made of polymer material; release of the drug layer is controlled by the polymer material. The product of the invention can prohibit the proliferation of smooth muscle cells, and reduce the possibility of restenosis in the stent; capture the endothelia1 progenitor cells in the blood, and re-gather the endothelia1 progenitor cells where damage is produced after the equipment is implanted, so as to promote the healing of the endothelium and the recovery of the functions, and reduce thrombus in the stent.

The invention relates to detection of arsenic contents in raw coal used in such municipal administration and industries as a thermal power plant, a thermomax company, a coking plant, steelmaking, coal industry and the like. The invention provides an effective method for separating and detecting complicated mixed state arsenic in coal, and the method can be realized by common reagents and conventional instruments, thereby being convenient, quick and low in cost. The method is used for separating and measuring mixed inorganic and organic arsenic in different macroscopic coal ingredients in the coal by cooperatively utilizing density fractionation, sequential extraction and column chromatography. According to the method, the defects that the content of the arsenic element in the coal is low and the arsenic element belongs to a plurality of kinds of complicated mixed states to be difficultly separated and detected are overcome, such information of the arsenic element in the coal as enrichment characteristic, main speciation distribution and micro chemical structure can be obtained so as to judge the category and transportation law of arsenic-containing pollutants in residues, wastewater and waste gases generated in such coal processing and utilization procedures as coal washing and coal combustion, and therefore efficient arsenic removing and arsenic fixing processes can be typically developed and optimized.

A method for simultaneously purifying organic arsenic and inorganic arsenic combined pollution wastewater belongs to the technical field of sewage treatment, and is characterized in that sorghum strawis used as a raw material, carbonization and Fe-based modification treatment are carried out to prepare a sorghum straw biochar powder adsorbent, and the adsorbent is used for treating combined pollution wastewater containing As (III), As (V) and ROX at the same time. Through inspection, the removal rate of As (III) is 48.50%, the removal rate of As (V) is 97.50%, the removal rate of ROX is 66.78%, the removal rate of harmful substances such as organic arsenic and inorganic arsenic is high, and the cost is low.

The invention relates to a treatment method of water containing organic arsenic, and discloses a method for removing organic arsenic in water through synchronous oxidation and in-situ adsorption. According to the method, organic arsenic pollutants in water are solved; particularly, a problem that organic arsenic in water source water of a large-scale drinking water arsenic removal water plant cannot be synchronously oxidized and adsorbed and removed in situ is solved. The method comprises the following steps: adding a divalent iron salt and persulfate into water containing organic arsenic to realize synchronous oxidative degradation and in-situ adsorption removal of organic arsenic in water, and the molar ratio of the divalent iron salt to the persulfate is 1:(0.8-4). The method disclosedby the invention is simple in process operation, wide in applicable water quality condition, capable of efficiently removing representative organic arsenic that is p-arsanilic acid contained in water,and particularly suitable for removing organic arsenic in water source water of large-scale drinking water arsenic removal water plants. The method is applied to the field of arsenic removal.

The invention aims at providing a method for identifying wild and artificial cordyceps sinensis. Based on the routine detection of arsenic and arsenic forms in cordyceps sinensis, the content of totalarsenic, inorganic arsenic and organic arsenic in wild and artificial cordyceps sinensis is determined by inductively coupled plasma mass spectrometry (ICP-MS) and anion exchange high performance liquid chromatography-inductively coupled plasma mass spectrometry (HPLC-ICP-MS). The content of inorganic arsenic relative to total arsenic in wild cordyceps sinensis is lower than that in artificial cordyceps sinensis, the percentage of content of inorganic arsenic in content of total arsenic in the wild cordyceps sinensis is lower than 10%, and the content of inorganic arsenic relative to total arsenic in artificial cordyceps sinensis is higher than 30%; in the wild cordyceps sinensis, the content of unknown organic arsenic accounts for 89%-92% of that of total arsenic, and in artificial cordyceps sinensis, the content of unknown organic arsenic accounts for 51%-65% of that of total arsenic. The identification method is simple in decision, saves time and labor, and is low in cost.

The invention provides a deep combined purification process for synthetic gas; the synthetic gas sequentially passes through a catalysis hydrogenation tower, an arsenic removing tower, a dechlorination tower, a fine desulphurization tower, a protection tower, an alkene saturation tower and a deoxidation tower to obtain the deep purified synthetic gas. After deep purification, the synthetic gas achieves that: sulphur (H2S and organic sulfur) is removed to less than 10 ppb; arsenic (AsH3 and organic arsenic) is removed to less than 10 ppb; chlorine (HCl and organic chlorine) is removed to less than 10 ppb; a carbonyl metal compound is removed to less than 20 ppb; oil stain is removed to less than 1 ppm; alkene is removed to less than 0.1 ppm; and oxygen is removed to less than 1 ppm. The deep purification proposal can greatly prolong the service life of a methane synthesis catalyst and has remarkable economic benefit. The deep combined purification process is also suitable for oil made from coal, methanol made from coal and the like; and the economic benefit is even higher than that of methanol synthesis equipment.

The invention relates to an organic arsenic feed additive discharge pre-alarming monitoring method in a water environment system, belonging to the environmental monitoring technical field, comprising the following steps: preparing tetrahymena culture medium; preparing arsanilic acid standard sample solution/roxarsone standard sample solution; collecting the actual water sample and separating and extracting the organic arsenic feed additive compound; inoculating the tetrahymena into the prepared culture medium and then subpackaged the inoculated culture medium into the sample culture tubes; respectively adding the organic arsenic feed additive standard solution into the sample culture tubes and respectively measuring the corresponding tetrahymena cell density using absorptometry; making the actual water sample intervening the corresponding tetrahymena biological model and analyzing and determining the corresponding tetrahymena cell density; based on the comparison of the tetrahymena cell density and the contrast of the corresponding tetrahymena cell density after the actual water sample intervention, to obtain the concentration range of the pollutant presence, thereby pre-alarming the discharge condition of the organic arsenic feed additive in the corresponding actual water environment.

The invention discloses a method for removing arsenic in water through a sulfite and ferric salt catalytic oxidation system, and relates to a method for removing arsenic in water. The method is aimedat solving the problems that an existing arsenic removal method is high in process cost, low in arsenic removal efficiency, complicated in operation process and too high in agent consumption and mud yield. The method includes the steps of adding sulfite and ferric salt to to-be-processed arsenic-containing water, adjusting the pH value to be 4-6, conducting stirring reaction, and conducting standing at a room temperature to obtain output water. Compared with a pure adsorption method, the method is low in agent consumption, high in processing efficiency and stable in effect, can remove 95% or above of organic arsenic and 98% or above of inorganic arsenic with 60 minutes and is suitable for removing the arsenic in water.

The invention discloses a method for harmless treatment on arsenic-containing sludge. The method comprises pre-treatment, first-stage microwave oxidizing roasting and second-stage microwave oxidizing roasting. Concretely, the method comprises carrying out dehydration on arsenic-containing sludge until water content is in a range of 60-70%, adding a curing agent into the arsenic-containing sludge, carrying out mixing to obtain a uniform mixture, processing the mixture to obtain particles, heating the particles at a temperature of 90-110 DEG C for 4-6min, carrying out microwave heating at a temperature of 300-500 DEG C, feeding oxygen into the particles, carrying out roasting for 10-30min so that trivalent arsenic in the sludge is oxidized to form pentavalent arsenic, continuously feeding oxygen into the sludge, carrying out microwave heating at a temperature of 500-700 DEG C, and carrying out heat preservation for 20-40min so that trivalent arsenic is further oxidized and organic arsenic obtained by oxidizing roasting cracking in the step C is further oxidized and decomposed. The arsenic-containing sludge is subjected to microwave catalytic oxidation so that curing effects are improved, process is simple, roasting time is short, a temperature is low, no secondary pollution is produced in the whole process, arsenic-containing sludge stacking-caused environmental pollution problem is solved, and good economic benefits, environmental benefits and social benefits are obtained.

The invention discloses an organic arsenic wastewater treatment and arsenic stabilization method, which specifically comprises the following steps: in a neutral aerobic environment, adding zero-valentiron and a complex, and stirring to form active oxygen species, and thoroughly oxidizing organic arsenic in a water body into inorganic arsenic by using the active oxygen species; after the oxidationstage is finished, stopping aeration, adding an aluminum salt, and stirring continuously to form various hydroxyl complexes and hydroxides so as to achieve the effective separation of inorganic arsenic; and controlling the ratio of the complex to the zero-valent iron to the aluminum salt in the system so as to achieve the stabilization of the arsenic-containing sludge. According to the method, the thorough purification of organic arsenic wastewater can be realized, the formed arsenic-containing sludge is small in amount, the leaching amount of arsenic in the sludge is small, and the bioavailability is weak. The method can be used for treating livestock and poultry breeding wastewater, industrial wastewater, surface water and underground water containing organic arsenic.

The invention discloses a preparation method of an iron-manganese oxide/starch/biochar composite material for simultaneously adsorbing inorganic arsenic and organic arsenic in a water body. The preparation method comprises the following steps: adding corn starch and biochar into FeSO4 and MnSO4 solutions, adding a KMnO4 solution under magnetic stirring, adjusting the pH value to 2.0 with NaOH, aging the solution, and filtering and drying the solution to obtain the ferro-manganese oxide/starch/biochar composite material. Due to the addition of the starch and the biochar, the synthesized ferro-manganese oxide particles are uniformly dispersed and uniform in particle size, and the particle size range is 300nm-600nm, so that the adsorption capacity of the composite material on trivalent arsenic, pentavalent arsenic and roxarsone is remarkably increased. The surface active adsorption site of the material is a FeOH group, and the Fe-OH group and an arsenic compound can form an inner sphere Fe-O-As compound. The preparation process is simple, the cost is low, the used raw materials are low-carbon and environment-friendly, and various forms of arsenic in the water body can be adsorbed at the same time.

The invention discloses a nucleic aptamer-based organic arsenic molecular imprinting polymer in marine products, a preparation method thereof and application thereof. The molecular imprinting polymer is prepared by polymerizing organic arsenide template molecules, a functional monomer, a cross-linking agent, a pore-forming agent, an initiator and an organic solvent in a molar ratio of (0.1-2.5):3.0:(0.1-4):(30-60):(0.01-0.10):(1.0-10), wherein the functional monomer is a nucleic aptamer. The method for preparing the organic arsenic molecular imprinting polymer comprises the following steps of: (1) mixing the organic arsenide template molecules, the functional monomer, the cross-linking agent, the pore-forming agent, the initiator and the organic solvent uniformly in a molar ratio, and polymerizing; (2) taking the obtained polymer out of a reactor, grinding and sieving; and eluting by using eluent until the polymer does not contain bacterial toxins, cleaning by using the organic solvent until the solution is neutral, and drying under vacuum to obtain the molecular imprinting polymer. The molecular imprinting polymer has the excellent performance of molecular recognition, so that the sensitivity and selectivity of detecting organic arsenic in the marine products are improved greatly.

The invention discloses a method for promoting efficient photo-catalytic oxidation of phenolic pollutants by organic arsenic pollutants in situ. The method comprises the steps that a TiO2 photocatalyst is added into waterwater to be treated containing the organic arsenic pollutants and the phenolic pollutants simultaneously to form a photocatalytic degradation system, and synergistic photocatalytic degradation of the organic arsenic pollutants and the phenolic pollutants is realized under illumination. According to the method for promoting the efficient photo-catalytic oxidation of the phenolic pollutants by the organic arsenic pollutants in situ, on a premise of not additionally adding water treatment costs, through the collaborative coupling of the organic arsenic pollutants in water andthe TiO2 photocatalyst, the degradation efficiency and stability of the phenolic pollutants is obviously improved in situ.

The invention discloses an efficient separation method for arsenic and alkali in arsenic alkali residues. The method is characterized in that the arsenic and the alkali in the arsenic alkali residuesare enabled to enter a solution through a water leaching method, then arsenate is transformed into organic arsenate through a catalytic reaction, the organic arsenate can be chelated and precipitatedwith heavy metal ions very easily, the solubility product of the organic arsenate is very small, the difference between the arsenic-containing component and the carbonate or the hydroxyl is expanded,and therefore the organic arsenate is converted into organic arsenic acid heavy metal salt precipitate through an anode electrolysis technology, the organic arsenate is completely separated from the alkali liquor, and the organic arsenic acid heavy metal salt precipitate is converted into an arsenic oxide or an elementary substance As through pyrogenic attack. According to the method, the arseniccan be removed from the high-alkaline solution in a rapid, efficient and economical way, the process is simple, and the operation is convenient; and the method can meet the requirements of industrialproduction.

The invention discloses a treatment method of organic arsine-containing wastewater, and relates to a treatment method of wastewater. The treatment method of the organic arsine-containing wastewater comprises the following steps: adding FeCl3.6H2O into the wastewater, stirring for dissolving, adjusting the pH to 8-8.5 by CaO, further stirring for 2 h, adding 0.02 mg/ L PAM (polyacrylamide), stirring for 5min, standing for layering, and taking out a supernatant; adding FeSO4.7H2O into the supernatant, stirring for dissolving, adjusting the pH to 3, and dripping 30% of H2O2 within 30 min; further stirring 2.5 h, adding the CaO to adjust the pH to 8-8.5, stirring again for 2 h, standing for layering, and taking out supernatant. By the treatment method, wastewater with high organic arsenic content and high COD content can be treated, and the organic arsenic and the COD can be simultaneously removed; the total arsenic in the treated wastewater can be reduced to below 0.5 mg/ L and the COD can be reduced to below 150 mg/ L, so that the outlet water quality meets a national second-level discharge standard.

The invention relates to the technical field of soil restoration, in particular to a device for restoring soil contaminated by organic arsenic compounds. The device comprises a centralized treatment shed and multiple treatment hoods which are arranged in the centralized treatment shed at intervals, and the treatment hoods are equipped with multiple microwave restoration devices; and the device further comprises multiple chemical agent conveying pipelines and multiple chemical agent output pipelines, the chemical agent conveying pipelines penetrate through the upper portions of the side walls of the treatment hoods to extend into the interiors of the treatment hoods, the chemical agent output pipelines penetrate through the lower portions of the side walls of the treatment hoods to extend into the interiors of the treatment hoods, and the side walls of the chemical agent conveying pipelines and the side walls of the chemical agent output pipelines are each provided with multiple injection orifices. The invention further provides a method for restoring the soil contaminated by the organic arsenic compounds by means of the restoration device. By means of the device and the method, the standby time of the soil is shortened, resource waste is reduced, the restoration time is shortened, the restoration efficiency is improved, and the restoration effect is improved.

The invention provides a device, method and system for ultrasonic coupled integrated wastewater treatment. On the one hand, since membrane separation and a persulfate advanced oxidation reaction during which generated free radicals degrade organic matter, and destroys heavy metal complexes and organic arsenic and organic phosphorus are integrated, and a plurality of pollutants are removed throughadsorption, complexation and co-precipitation of metal ion floc, so that the probability of fouling of a filter membrane is reduced; and since the filter membrane is arranged in an accommodating chamber, iron hydroxide floc which is accumulated on the filter membrane is continuously disturbed simultaneously through the disturbance brought by a mixer, zero-valent iron particles are disturbed on thesurface of the filter membrane, and an on-line membrane cleaning effect is achieved through combination of the in-situ generated free radical oxidants, so that the burden on the filter membrane is further reduced, and fouling of the filter membrane is further prevented; when the device is compared with a non-integrated device of the persulfate advanced oxidation reaction with membrane separation,the phenomenon of fouling of the filter membrane can be reduced greatly; and in addition, a synergistic effect can be generated through ultrasonic cavitation, pyrolysis, mechanical vibration and thepersulfate advanced oxidation reaction, and the device can be applied to continuous wastewater treatment.