484 results about "Pollution Remediation" patented technology

The invention discloses slow-release fertilizer with the effect of soil remediation, which is prepared by polyhydroxyalkanoates which can be completely biodegraded, organic and inorganic nutrients and other substances, by slow-releasing the organic and inorganic nutrients, microorganism propagation and sustained and rapid growth of plants can be promoted, the bioactivity and water solubility of polycyclic aromatic hydrocarbons are quickened, and simultaneously, the defects of fertilizer loss and repeated fertilization can be avoided, thereby saving the cost and enhancing the soil remediation efficiency. The invention also discloses a soil pollution remediation method by utilizing the slow-release fertilizer, plants with the remediation effect are planted in the soil with the slow-release fertilizer, and efficient, environment-friendly and sustained remediation of the soil polluted by the polycyclic aromatic hydrocarbons (PAHs) can be realized by utilizing the microorganism-plant remediation technology.

The invention relates to a method for preparing ethylenediamine modified chitosan composite magnetic microspheres and application thereof. The method specifically comprises the following steps of: mixing acidic aqueous solution of chitosan and a water-based magnetofluid first, then crosslinking by using glutaraldehyde, then adjusting the pH value to form a gelatinous precipitate, then modifying by using ethylenediamine and epichlorohydrin, and washing and drying to obtain a final product. The product has good absorption effect on radionuclide aranium and metal ions such as heavy metal Pb, Cr and the like; the removal rate reaches over 95 percent when the initial concentration of various ions is within the range of 200mg/L; and the product has quick absorption rate and good regeneration performance. The ethylenediamine modified chitosan composite magnetic microspheres can be used for metal recovery and pollution remediation in mines, radioactive waste water, smelteries, electronics factories and waste water of electroplating factories.

The invention provides a safe and reliable compound conditioner for reducing the heavy-metal mobility and bioavailability of soil or sludge compost and a preparation method thereof. The compound conditioner is a powdery compound prepared by adding heavy-metal auxiliary passivating agent to alkaline agent, wherein, the heavy-metal auxiliary passivating agent includes precipitating agent and absorbing agent; and the compound conditioner comprises the following components by the mixing proportion (weight percentage): 78% to 91% of alkaline agent, 5% to 13% of precipitating agent and 4% to 9% of absorbing agent. The preparation method comprises the following steps: (1) drying and pulverizing one, two or more than two substances among soda-manufacturing waste residue, lime and fly ash and sieving by a 60-mesh sieve to obtain an alkaline powdery substance as the alkaline agent; (2) mixing the alkaline agent, the precipitating agent and the absorbing agent by the above mixing proportion; and (3) drying and pulverizing the mixed products and sieving by a 200-mesh sieve to obtain the powdery compound conditioner. The invention can greatly reduce the environmental risk caused by the prior art and realize the sustainable development of green circular economy, industry and agriculture by recycling the industrial waste at the same time.

The invention provides a trough for simulating groundwater pollution. The simulated trough at least comprises a trough which is internally filled with an aquifer medium, an aquifuge medium and a lens which are used for simulating typical hydrogeology unit; the simulated trough is provided with an underground water recharge area, a runoff area and a discharge area sequentially from the trough head and the trough body to the trough tail; a hydraulic control device supplies water from the underground recharge area located at the trough head; the runoff area at the trough body comprises a water-distribution and water-rock interaction section containing a porous barrier and a pollution restoration device; the water is discharged out from the discharge area located at the trough tail; the hydraulic control device comprises at least two water boxes with adjustable height; the two water boxes are arranged at two ends of the trough body respectively; a water level difference exists between the two water boxes so as to provide an underwater power field; a plurality of monitoring holes and contamination injection holes are arranged above the trough; and the monitoring holes are connected with the monitoring system. The simulated trough for simulating the groundwater pollution has the advantages of integrating simulating, monitoring and restoring functions into a whole.

The invention relates to a passivator for remediation of farmland soil subjected to combined pollution of heavy metals such as cadmium, chromium, copper and nickel, and a preparation method and a use method of the passivator. The passivator is prepared from a passivator A and a passivator B, wherein the passivator A is prepared from montmorillonite, kieselguhr, sepiolite, illite and ferrous sulfate; the passivator B is prepared from periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide; the passivator is suitable for the farmland soil subjected to the combined pollution of the cadmium, the chromium, the copper and the nickel, and is prepared from the multiple different porous absorption materials with specific contents and a passivation material; the components of the passivator have complementary advantages, and the principles such as absorption and stabilization are combined; the combination forms of the heavy metals are effectively enhanced by ion exchange, complexing, chelating and adsorption methods, and the combination forms are converted into more stable strong organic binding states and residue states, so that the effective state contents of the heavy metals in the farmland soil are effectively reduced, and the passivation effect is long-acting and stable; therefore, the passivator has a great repair effect for the farmland soil subjected to combined pollution of the cadmium, the chromium, the copper and the nickel.

The invention discloses an anaerobic biological oxidation water pollution remediation method with Fe3+ in hematite as an electron acceptor. According to the method, Fe3+ in hematite serves as the electron acceptor and is loaded with functional microbial florae, and reduction-state pollutants in water are subjected to oxidation removal in the anaerobic or anoxic environment, wherein functional microorganisms include Geobacter sulfurreducens and Shewanella spp.. The method is wide in application range, low in cost, ideal in effect and especially suitable for remediating polluted water with high remediation difficulty.

The invention relates to a benthonic animal-algae-aquatic plant-fish based river water ecological environment self-remediation method. The method is to overcome problems of river water ecological environment remediation methods at present, namely short effect duration, high costs and easy generation of secondary pollution. The method includes 1) evaluating the degree of pollution of a river, 2) planting reed and seeding algae, 3) throwing in plankton and benthic mollusks, 4) planting submerged plants, 5) throwing in shrimps, herbivorous fishes, omnivore fishes and filter-feeding fishes, 6) throwing in carnivorous fishes, and 7) harvesting the reed and the submerged plants before the reed and the submerged plants die, catching the benthic mollusks and the shrimps, and catching the fishes after two years. The method is long in effect duration, low in cost and free of secondary pollution and is applied for the field of river water pollution remediation.

The invention discloses an integrated analog device for groundwater pollution process and pollution remediation. The integrated analog device comprises an analog tank, wherein the analog tank is divided into a front part box and a rear part box, one side of each of the front part box and the rear part box is an open end, a permeable reactive barrier is arranged between the open ends of the two boxes, and two side surfaces, corresponding to the open ends of the two boxes, of the permeable reactive barrier are provided with vertically arranged sampling holes; the open ends of the two boxes are concave troughs, and a blocking plate is made of draw-out and insertion steel; the side walls on two sides of the analog tank are respectively provided with sampling holes and monitoring holes; the other sides of the two boxes are respectively provided with an upstream water tank and a downstream water tank, and a porous plate is respectively arranged between the upstream water tank and the boxes and between the downstream water tank and the boxes; and the bottom part of the outer side wall of the upstream water tank is provided with a water inlet hole, the outer side wall of the downstream water tank is provided with vertically arranged overflow holes at different heights, and a water stop valve is arranged at the bottom part of the outer side wall of the downstream water tank. The invention also discloses a method for using the device.

The invention discloses a contaminated soil remediation device. The contaminated soil remediation device comprises a base plate, a barrel, a motor, a first gear, a second gear, a hollow rotary shaft,a screen, a supporting plate, mounting shafts, third gears, inner gear rings, hollow stirring rods, a spray tank, an inoculum tank, a disc, a movable rod, piston rods, two cylinder bodies and pistons.According to the contaminated soil remediation device, the motor, the first gear, the second gear, the hollow rotary shaft, the third gears, the mounting shafts and the inner gear rings are arrangedand matched mutually so that soil can be crushed more sufficiently, and the crushing efficiency is improved; the disc, the movable rod, the piston rods, the pistons, the cylinder bodies, the spray tank and the inoculum tank are arranged and matched mutually, so that liquid is sprayed out of the surface of the hollow rotary shaft and the surfaces of the hollow stirring rods while the soil is crushed and stirred; and the two cylinder bodies are arranged, so that spays and an inoculum solution are alternately sprayed into the barrel so as to be better mixed with the soil, and the soil remediationefficiency is improved.

On one hand, the invention discloses a heavy metal contaminated soil repair conditioner, which comprises at least one of the following components: sulfur-modified charcoal, attapulgite, zeolite, iron powder and lime substances; and on the other hand, the invention further discloses an application of the heavy metal contaminated soil repair conditioner in repairing of heavy metal contaminated soil. The heavy metal contaminated soil repair conditioner is wide in raw material source, low in cost, simple in preparation and application methods, obvious in repairing effect on soil heavy metal compound pollution, does not cause a risk of secondary pollution, and also has the effects of improving the soil structure and improving the soil fertility. The agriculture-forestry-stockbreeding wastes are taken as one of the main raw materials, so that the problem of treatment is solved and the heavy metal contaminated soil repair conditioner has great popularization and application value.

The present invention relates to a microbial fuel cell water purification method, particularly to coupling of ecological floating islands and microbial fuel cells, wherein the method can be used for ecological restoration of contaminated river courses, lakes and parks, residential districts and other landscape water bodies, and belongs to the water body pollution remediation in environmental projects. According to the present invention, the black and odor river sediment or city sludge is adopted as the bottom matter, the carbon felt is adopted as the anode, and the graphite disc is adopted as the cathode to construct SMFC; floating-bed plants are introduced, and are planted on the overlying water body by using the floating body to form the floating-bed plant-sediment microbiological fuel cell (P-SMFC); with the combination of the floating-bed plant root system secretion characteristics, the root system secretions provide nutrients for the rhizospheric microorganisms; and the root system radially secretes oxygen to make the rhizospheric zone form a lot of aerobic zones, and the oxygen secreted by the plant root zone can spread to the SMFC cathode, such that the cathode region dissolved oxygen concentration is increased, and the restoration performance of the SMFC on the sediment pollution and the overlying water pollution are improved.

The invention belongs to the technical field of remediation of pollution of arsenic in soil, arsenic in sediment and arsenic in tailings, also relates to the technical field of agriculture environmental protection, in particular to a chemical fixing material suitable for remediation of pollution of arsenic in soil, arsenic in sediment and arsenic in tailings, and a preparation method and application thereof. The chemical fixing material prepared can effectively fix the arsenic in arsenic-polluted soil, arsenic-polluted sediment, arsenic-polluted tailings and the like, reduce the bioavailability of the arsenic, and inhibit crops from absorbing and accumulating the arsenic. The chemical fixing material for the arsenic is characterized in that: 200kg of dry basis of a finished product comprises the following compositions by weight: 120 to 145kg of nano-grade anatase titanium dioxide, 30 to 40kg of nano-grade rutile titanium dioxide, and 20 to 30kg of zero-valent iron powder (of which 90 percent passes through a 100-mesh sieve); and 0 to 10kg of tree saw dust or stalk powder is added or not added so as to prepare the chemical fixing material. The invention also discloses the preparation method and the application of the material.

The invention discloses a method for soil heavy metal pollution remediation through grass family with enrichment capacity, which is characterized by including the following steps: a) detection in advance for heavy metal content of soil; b) soil cultivation; c), selection and cultivation of grass family; d) groove backfill and young ear uprooting; e), process detection of heavy metal content; f) plant stem recovery; and g) final detection of heavy metal content. The method improves burying height of plant stems of the grass family and root quantity of plants to improve the absorption and enrichment of plants to soil heavy metal pollution, and has the advantages of low cost, safety, reliability, and remarkable remediation effect on heavy metal pollution.

The invention belongs to the technical field of biomaterial embedment and particularly relates to a preparation method and a preprocessing method of a polyvinyl alcohol-sodium alginate biomaterial-embedded zero-valent-iron-ferroferric-oxide double-nanometer system. Ferrous pellets which are prepared by the method are applicable to the field of conventional zero-valent-iron pollution remediation, and meanwhile, potential risks in the application of nanometer materials are decreased, so that the purpose of safe and highly-efficient processing is achieved. The preparation method and the preprocessing method of the biomaterial-embedded zero-valent-iron-ferroferric-oxide double-nanometer system comprise the following steps of preparing a zero-valent-iron-ferroferric-oxide double-nanometer material by using ferroferric-oxide granules which are prepared by a coprecipitation method as a stabilizing agent of nanometer zero-valent-iron granules; then carrying out embedded processing on the double-nanometer material by selecting a proper biomaterial to obtain embedded pellets; finally carrying out acid processing and reduction processing on the embedded pellets to obtain stable and highly-efficient biomaterial-embedded zero-valent-iron-ferroferric-oxide pellets.

The invention relates to a method for remediation of volatile organic compound and mercury compound contaminated soil, and belongs to the technical field of soil contamination remediation. The method comprises the steps that the contaminated soil is firstly excavated out of a contaminated land parcel, and breaking and screening treatment is carried out; then ferric chloride powder is added into soil particles according to the proportion of 1 g/kg-10 g/kg, after even mixing and stirring are carried out, vacuum heat treatment is carried out, the temperature is firstly controlled to range from 250 DEG C to 300 DEG C, and mercury and a small quantity of volatile organic compounds in the soil particles are removed; then the temperature is controlled to range from 500 DEG C to 600 DEG C, the volatile organic compounds in the soil are removed, and condensed air is supplied into the atmosphere through a vacuum pump; and the treated clean soil is taken out of a vacuum reactor. According to the method, remediation of the volatile organic compound and mercury compound contaminated soil is achieved, and the technological process is simple, efficient and free of secondary contamination.

A biological denitrification method is a most economical and effective groundwater nitrate pollution remediation method which is put into use currently, but has the problems of denitrification carbon source shortage, poor carbon source controlled release, easily-caused secondary pollution, and the like. Aiming at the problems, the invention provides a groundwater nitrate pollution bioremediation technology based on a semi-inert solid-phase organic carbon source carrier, which can provide a long-acting organic carbon source at the same time of taking as a denitrification bacteria carrier by utilizing the semi-inert solid-phase organic carbon source carrier as a filling medium in the groundwater nitrate pollution in-situ or ectopic remediation, ensures that the nitrate denitrification reaction can be fully finished and the groundwater nitrate pollution can be remediated economically with high efficiency and provides a powerful guarantee for groundwater safety drinking.

The invention relates to the field of soil heavy metal pollution remediation and specifically discloses an APP combined remediation method for cultivated land heavy metal pollution remediation. According to the APP combined remediation method, the chemical technology and the engineering technology are combined, and the operable and propagable APP combined remediation method comprising a soil conditioner (Amendment), power of hydrogen adjustment (pH) and deep ploughing (Plough) is formed. Through the combined remediation method, on the premise that the soil conditioner product which uses natural mineral raw materials and is efficient in remediation, low in cost and free of secondary pollution to the environment is provided, the nature of crops planted in cultivated land is not changed, heavy metals in the soil are passivated and stabilized, absorption of the crops to the heavy metals is suppressed and hindered, enrichment of the heavy metals in the crops is reduced, meanwhile, medium elements such as calcium and silicon are provided for growth of the crops, and safety production of agricultural products is achieved.

The invention belongs to the treating direction of soil pollution, and particularly relates to a treatment method for heavy metal pollution of soil. Biodegradable citric acid is added into the polluted soil to serve as a heavy metal activating agent for activating non-free state heavy metal on the soil particle surfaces, the non-free state heavy metal is converted into free state heavy metal easyto capture and absorb, and therefore the heavy metal superaccumulative plant absorption efficiency is strengthened, the pollution repairing speed can be increased, the citric acid can be degraded andused by biology (such as saccharomycetes ), and the problem of secondary pollution does not exist.

The invention discloses a ternary composite repairing agent, containing iron oxide, humus and reducing bacteria thereof, for in-situ remediation of organic pollution in soil and sediment. The repairing agent of the invention is prepared by carrying out fermentation enlarge culture on ferric reducing microorganism and mixing with iron oxide and humus uniformly. The microbial repairing agent of the invention can accelerate degradation of organic pollutants under an anaerobic condition and has good in-situ remediation effect on organic pollution soil and black and stink sediment. Raw materials are all natural substances and environment-friendly, and cause no secondary pollution. The microbial repairing agent of the invention is simply applied without excavating or disturbing original environment or oxygen, requires low work amount and small cost, and is apt to large-scale usage. The preparation method of the repairing agent of the invention can obtain a microbial repairing agent product simply and fast.