98results about How to "Reduce ecological risk" patented technology

The invention relates to a reductive degradable stabilizer for heavy metal and/or organic matter polluted soil as well as a preparation method and use of the stabilizer. The reductive degradable stabilizer can be used for quickly and efficiently stabilizing the heavy metals and the organic matters in the polluted soil by virtue of a synergistic effect of a plurality of active ingredients, and can also be used for further lowering the content of the organic matters, so that the purpose of lowering leaching toxicity of pollutants and health risk is realized; therefore, the reductive degradable stabilizer is a novel and efficient stabilizer which has the advantages of being wide in treatment substrate, capable of reducing the total amount of the organic matters, good in stabilizing effect, convenient to operate and the like, and has a wide range of application in the governance fields including polluted soil, bottom mud, sludge and the like.

The invention discloses a Nen River drainage basin typical region water ecology risk assessment method based on a system dynamics decision model, and relates to the Nen River drainage basin typical region water ecology risk assessment method. The method comprises the following steps: simulating different treatment schemes for tributary afflux, nonpoint source discharge, upland water and riverside pollution discharge factors which affect the amount of a pollution source input into the Nierji reservoir through the system dynamics decision model to achieve an affect that an ecological risk of a reservoir is lowered, and scheme decisions are realized ; evaluating the water ecology risk situations of different point locations in different time periods in a lake reservoir on the basis of a water ecology risk index system; constructing a sample space of a Bayesian network on the basis of Netica software; and calculating ecology risk happening probabilities of different degrees when each index is changed so as to realize Nen River drainage basin typical region water ecology risk assessment.The method is applied to river drainage basin typical region water ecology risk assessment.

The invention discloses method and device for biochemically recharging and restoring polluted soils in a chromium slag yard. The device comprises a soil treatment groove containing soils to be treated, a middle pond, a biochemical pond and a bacteria culture pond. Every two parts are connected through a water pipe, chromium polluted soils are installed in the soil treatment groove to be heaped after being crushed by a 2cm sieve, the height of a mound is smaller than 0.8m, and the soils are sprayed by Cr (VI) reducing bacteria (Pannonibacter phragmitetus BB) culture medium with the spraying strength of 0.008-0.015m<3>/h.m<2>; and leachate is collected from the bottom of a soil groove to the middle pond, bacterial liquid in the middle pond is pumped into the biochemical pond by an alkali resistance pump, and bacterial liquid in the biochemical pond circulates again to be used for spraying the soils and is in circulating spraying for 5-7 days until the soil leachate does not contain Cr (VI). By adopting the invention to restore the polluted soils in the chromium slag yard, the removal rate of water-soluble Cr (VI) in the soils achieves 99 percent, and the concentration of Cr (VI) leaching toxicity in the soils after restoring is lower than 0.5mg/L and achieves a standard limited value of roadbed materials and concrete aggregates in Technical Specifications for Chromium Slag Pollution Control (HJ/T301-2007). Simultaneously, the invention has the advantages of having simple technology, low cost and no secondary pollution, improving the physicochemical property of the soils, and the like.

The invention discloses a stabilizing agent applicable to soil with combined pollution of heavy metals and semi-volatile organic compounds and a use method thereof. The stabilizing agent comprises the following components in percentage by weight: 5-10% of heavy-metal chelating agent, 10-20% of cementing material, 55-65% of modified clay mineral and 10-15% of alkaline exciting agent, wherein the modified clay mineral is prepared by mixing hexadecyl trimethyl ammonium bromide and sodium lauryl sulfate according to the volume ratio of (1:0.8)-(1:1.2), and then adding the hexadecyl trimethyl ammonium bromide and the sodium lauryl sulfate into the clay mineral. The use method comprises the following steps of: mixing and grinding the cementing material, the modified clay mineral and the alkaline exciting agent till the obtained particles have the Brinell specific area of 5000-8000cm<2>/g, pass through 200 meshes and have the water content less than 3%, and directly adding the obtained mixture into the soil polluted by the heavy metals according to the mass ratio of 10-20%, mixing and stirring; preparing the heavy-metal chelating agent into 10-20% solution, spraying the solution into the soil polluted by the heavy metals, mixing and stirring. The stabilizing agent and the use method disclosed by the invention have the advantages that the traditional cement type components are not used, the leaching toxicity of the treated pollutants is obviously reduced, and the heavy metals and semi-volatile organic pollutants in the soil can be fast stabilized.

The invention discloses a method for building a Nierji reservoir water ecological risk early warning model through the fusion technology, and relates to a method for building a Nierji reservoir water ecological risk early warning model. A system dynamics decision-making module is adopted for risk early warning and decision making quantitative analysis, then a Bayesian network model is adopted for risk early warning and decision making quantitative analysis according to a quantitative analysis result, and therefore Nierji reservoir water ecological risk early warning and decision making are achieved. The Nierji reservoir water ecological risk early warning model is built, the system dynamics and the Bayesian network model technology are fused, quantitative advantages in early-warning and decision-making research are highlighted, and Nierji reservoir water ecological risk early warning and decision making are achieved. The accuracy of the model is verified based on comparison and analysis for current data, and the availability of the model is verified through early-warning research on relative risk source risks and decision-making research on control strategies.

The invention relates to the technical field of plant remediation of oil-contaminated soil, in particular to a method for treating and remediating oil-contaminated soil by using gaillardia aristata pursh flower plants. The method is to plant gaillardia aristata pursh in oil-contaminated soil. When the total petroleum hydrocarbon concentration of the soil is 10,000mg/kg, the growth amount of the plants is not inhibited basically, and the gaillardia aristata pursh can effectively degrade the total petroleum hydrocarbon in the oil-contaminated soil through the combined functions of the developed roots and root microbes to reduce the total petroleum hydrocarbon content in the contaminated soil. When the gaillardia aristata pursh is planted for 90 days, the degradation rate of the total petroleum hydrocarbon content in the contaminated soil can reach 56.63 percent which is nearly 4 times a blank natural degradation rate which is 15.49 percent. This proves that the gaillardia aristata pursh has high oil contamination resistance and high total petroleum hydrocarbon degradation capability. Thus, the total petroleum hydrocarbon in soil can be effectively removed by planting the gaillardia aristata pursh in the oil-contaminated soil, and removing all plants and well treating the plants in a centralized manner after the plants are mature.

The invention discloses an additive applied to polluted soil. The additive comprises, in parts by mass, 30-40 parts of a clay mineral, 20-30 parts of a supporting type clay mineral, 12-13 parts of a molecular sieve ore, 6-8 parts of apatite, 4-9 parts of an iron oxide, 6-9 parts of a gel material, 3-6 parts of an activator, 6-15 parts of a reducing degradation agent and 1-6 parts of an auxiliary material. The additive can stabilize heavy metals and organic matters in the soil quickly and efficiently under the synergistic action of various effective components and can further decrease the content of the organic matters, so that the leaching toxicity of pollutants is reduced, the risk is reduced, and the additive has the broad application prospect in the field of treatment of the polluted soil and the like.

The invention provides a purification system for integrated culture of fishes and shrimps. The purification system comprises an integrated vertical subsurface flow wetland, a river channel, a water purification pond, a water storage pond and a culture pond, wherein the integrated vertical subsurface flow wetland is used for preliminary purification of a water source; the river channel is connectedwith the integrated vertical subsurface flow wetland through a water pipe for further water quality purification; the water purification pond and an outlet end of the river channel are isolated by anoverflow dam, thus promoting water quality; an inlet end of the water storage pond and an outlet end of the water purification pond are isolated by a subsurface flow dam; an outlet end of the water storage pond is isolated from the integrated vertical subsurface flow wetland by an isolating device; after the water quality is finally purified and monitored, water flows into the culture pond through a water pump; and freshwater shrimps and Ietalurus punetaus are mixed-cultured in the culture pond, and culture wastewater in the culture pond flows into the river channel through a drainage channelfor purification, and the water in the river channel then flows into the water purification pond and the water storage pond for circular purification. According to the purification system, by employing a four-stage water purification treatment system, the aquaculture wastewater can be used after being circularly purified, and zero wastewater discharge is almost realized, thereby avoiding pollution to the surrounding water environment.

The invention provides a preparation method and application of a sediment-water interface phosphorus release control material. For the first time, a lake sediment and kaolin mixture is used as a basic raw material, and processes like oxidation, iron salt modification, granulation and calcination are adopted, so that adsorption-desorption balance concentration EPC0 value of the material to phosphate is remarkably lowered, linear distribution coefficient Kd value of the material is increased, and the material can effectively reduce sediment interstitial water phosphate concentration and can inhibit sediment-water interface phosphate release. The material itself has weak phosphate desorption capability and high adsorption and buffering capability, so that the material can truly realize effective obstruction and control on sediment-water interface phosphorus release. The material is low in material cost, high in social and economic benefit and safety, free of ecological risk to lake water, energy-saving and environment-friendly and has remarkable effect on controlling sediment-water interface phosphorus release in different lake areas of the Dian Lake in the process of application.

The invention relates to a method for remedying heavy metal-contaminated soil by combining chemical reduction and chemical leaching, and aims to provide a method for remediation by virtue of combination of chemical reduction and chemical leaching. The method is used for eluting iron and manganese oxides to improve an effect of removing heavy metals from soil by using a leaching agent. The method comprises the following steps of performing leaching by using a reducing agent aqueous solution, namely performing vibratory washing on the contaminated soil by using the reducing agent aqueous solution, and filtering washing liquid after centrifugation; and performing leaching by using a Na2EDTA (Ethylene Diamine Tetraacetic Acid) aqueous solution, namely adding the Na2EDTA aqueous solution into the contaminated soil leached by the reducing agent aqueous solution for vibratory washing, and filtering washing liquid after centrifugation.

The invention discloses preparation of a wastewater treatment agent and an application method thereof. At present, extensive attention of researchers is paid to a heterogeneous Fenton technology in the field of organic wastewater treatment. Due to low cost and high catalytic activity, nanometer pyrite has excellent application potential in the heterogeneous Fenton field. However, separation and recovery of the nanometer pyrite from a liquid phase need to use ultrafiltration, nanofiltration and other high-energy-consumption means, and the cost is high; the nanometer pyrite Fenton system is lowin effluent pH value and high in iron content, and has relatively high environmental risk. By virtue of the fixation effect of sodium alginate gel on nanometer pyrite grains and the cross-linking effect of sodium alginate molecules and iron ions, the wastewater treatment agent with advantages of being easy to separate and low in cost is prepared in the invention. The agent prepared in the invention has the advantages that the defect that the nanometer pyrite is difficult to separate is effectively overcome, and the environmental risk of the nanometer pyrite is weakened. By adopting the wastewater treatment agent prepared in the invention and the application method thereof, organic wastewater can be effectively treated, and the agent has wide application prospects.

The invention discloses a composting contaminated soil restoration method through straw. The method comprises the following steps that the straw is mixed with contaminated soil, initial compost raw materials are obtained and mixed with active biological carbon for composting treatment, and restoration of the contaminated soil is completed. The restoration method is capable of simultaneously reducing the effectiveness of various pollutants and has the advantages of low cost, simple process, convenient operation, high restoration efficiency, free of toxic and side effect and the like. Through the method, stacking of agricultural straw can be reduced, reduction treatment and resource utilization of agricultural straw solid waste are achieved, the pollutants in the soil can be effectively removed, and efficient restoration of the contaminated soil is achieved. The in-site restoration method is adopted, cost and pollution caused by transportation of raw materials or the contaminated soil can be reduced, meanwhile, the physicochemical property of the contaminated soil can be improved, the restored soil can be used for subsequent resource recycling, and the method has wide application prospects.

The invention belongs to the technical field of remediation of heavy metal contaminated soil, and particularly relates to a soil smoldering technology for treatment and remediation of heavy metal co-contaminated soil. The soil smoldering remediation method mainly comprises the following steps: plant straws are covered with soil to form a covered body; the outer layer is a soil layer, and the straws or a mixture of straws and soil are arranged inside; the inside is kept in an anaerobic condition, and the soil smoldering treatment is then carried out. Through solidification, absorption, chelation, complexation and other various reactions, the heavy metal co-contaminated soil treated by applying the technology provided by the invention achieves a reduced proportion of chemical forms which can easily migrate and diffuse to the environment, and an increased proportion of chemical forms which are difficult to release to the environment. Therefore, environmental and ecological risks from heave metals are reduced. The technology provided by the invention can simultaneously fix multiple heave metals, reduce the heave metal absorption and accumulation by plants, effectively kill various pathogenic bacteria in soil and increase the biomass of crops, and is a simple, high-efficient, easy-to-operate and low-cost in-situ remediation technology for heavy metal co-contaminated soil.

The invention relates to a method for separating and removing tetracycline antibiotics from livestock/poultry culture wastewater, particularly a method for lowering tetracycline antibiotic ecological environment risks in the livestock/poultry culture wastewater recycling process, belonging to the field of water pollution control and resource regeneration. The method is characterized by comprising the following steps: adding about 10-100mM of strong electrolytes (NaCl, MgCl2, MgSO4 and salt brine) into the wastewater to increase the ion concentration in the solution; adding acids (hydrochloric acid, nitric acid and sulfuric acid) to regulate the pH value of the wastewater to 1-5, sufficiently stirring to promote destabilization, aggregation and settling of suspended particulate matters and soluble organic matters in the wastewater, and carrying out solid-liquid separation, thereby separating the tetracycline antibiotics from the wastewater. The suspended particulate matters and soluble organic matters in the wastewater are removed, thereby achieving the goal of separating the tetracycline antibiotics, and lowering the antibiotic pollution risks in the livestock/poultry culture wastewater recycling process.

The invention discloses a method for efficiently decomposing complex ferrum and manganese phases in high-ferrum electrolytic manganese residues and synchronously recycling ferrum and manganese. The electrolytic manganese smelting waste residues containing the complex ferrum and manganese phases are subjected to neutral roasting under the protective atmosphere (N2), and by controlling the roasting conditions, the complex ferrum and manganese phases in the manganese residues are decomposed into ferric oxide and trimanganese dioxide. Meanwhile, volatile matters, crystal water and the like in the electrolytic manganese residues are removed in the neutral roasting process, and ferrum and manganese in the manganese residues achieve upgrade. The products of the neutral roasting can be directly subjected to dissociation through ball milling, efficient separation and recovery of ferrum and manganese are achieved through stepped magnetic separation, or by means of reduction roasting treatment, the ferric oxide is further reduced into ferroferric oxide, the reduction roasting products are subjected to the ball-milling-magnetic separation process, and then ferrum and manganese separation and recovery are achieved. The method is suitable for various kinds of Fe-Mn ore or manganese residues which are difficult to treat, and has the beneficial effects that the application range is wide, the process equipment is simple, and operation is easy. Efficient decomposition of the complex ferrum and manganese phases and separation and recovery of the ferrum and manganese phases in the high-ferrum electrolytic manganese residues can be achieved, and reduction and recycling of ferrum-manganese-contained solid waste can be achieved.

The invention provides a method for improving soil by utilizing sludge earthworm casts. The method comprises the following steps: (1) uniformly mixing air-dried and screened dry sludge earthworm casts and farmland cultivated soil according to a certain mass ratio; planting same plants respectively at corresponding ratios; setting three equal rows for each ratio and recording a finally harvested plant biomass; determining an optimal application ratio of the sludge earthworm casts by the biomass; (2) applying the dry sludge earthworm casts to the farmland soil according to the optimal application ratio of the sludge earthworm casts, uniformly and artificially mixing, and collecting blank soil, the earthworm casts and a mixed matrix for physicochemical detection. According to the method, nutrient substances including organic matters, nitrogen, phosphorus and the like in the earthworm casts are utilized so that rapid improvement of the soil is improved; the method is economical and efficient, high in ecological safety and easy to operate.