354results about How to "Short repair cycle" patented technology

The invention discloses a composite type artificial algal reef comprising a mature algal reef and a seedling reef. The mature algal reef comprises a solid base. The upper surface of the solid base is embedded with a metal frame, wherein the shape of the metal frame is identical to that of the upper surface of the solid base and the size of the metal frame is identical to that of the upper surface of the solid base. A conch net bag is arranged in the metal frame. The center of the upper surface is embedded with a metal stand column. A steel ring is welded to the upper end of the stand column. A plurality of seedling ropes are fixed between the metal frame and the steel ring. The seedling reef is fixed to the side face of the solid base of the mature algal reef, and algal seedlings are attached to the seedling reef. By the adoption of the composite type artificial algal reef, the attaching effect of alga is guaranteed, the repair period of an algae field is shortened, the success rate of repair and reconstruction of the algae field is improved, the adhesive rate of the seedlings is increased, and the seedling reef is firm, durable, small in size, light, and convenient to carry; the net bag made of waste conches is placed in the metal frame, and a biophile reef can be composed through diffusion and attachment of spores of fronds on the seedling ropes; resource utilization of the waste conches is achieved, and composite type artificial algal reef has the advantages of being economical and easy and convenient to use.

The invention relates to an in-situ remediation method of heavy metal-organic combined pollution soil. According to the method, a set of electrokinetic remediation device is added with a power switching system, an electrode heating technology is combined with the electrokinetic remediation and chemical oxidization technology, namely, the direct current power is utilized firstly, sodium persulfate used as the oxidizing agent is migrated to soil through electric process, meanwhile, migration and removal of heavy metal ion in the soil are realized. Then the alternating current power is switched, and soil is heated to a certain temperature through the electrode heating method so as to activate the sodium persulfate migrated to soil, and thereby realizing the in-situ degradation of organic pollutant in the soil. The method applies electrode to the electrode heating system and the electrokinetic remediation device at the same time, simplifies the remediation device and saves the system energy consumption while solves the difficulty that oxidant cannot migrate and activate in the soil and improves the remediation efficiency; the method is a combined soil remediation technology with prospect of application and promotion.

The invention discloses a repair medicament for compound heavy metal polluted soil. The repair medicament comprises the following components: phosphate compound, soluble ferric salt, magnesium oxide, inorganic clay, an organic chelating agent and silicon dioxide, wherein the phosphate compound adopts one or the combination of phosphate, hydrophosphate or dihydric phosphate. The repair medicament is applicable to compound heavy metal polluted farmland soil, compound heavy metal polluted industrial site soil and compound heavy metal polluted mine site soil. Stirring and mixing of the repair medicament and the heavy metal polluted soil belong to in-site stirring and mixing or off-site stirring and mixing. The repair medicament is short in repair cycle and low in cost, has wide spectrum, and is simple in technical operation.

The invention relates to modified biomass charcoal and a remediation method of heavy metal contaminated soil. The modified biomass charcoal is prepared by the following steps: (1) sieving biomass charcoal, and washing so as to remove surface fly dust and impurities until the pH value of a scrubbing solution is 6.5-7.5; (2) uniformly mixing the biomass charcoal and a phosphoric acid solution according to the mass ratio of 1 to (1.5-2.5), and then soaking at room temperature for 24 hours above, wherein the mass percent concentration of the phosphoric acid solution is 10-40%; and (3) carrying out solid-liquid separation on the soaking solution, and then drying the obtained a solid material, namely the modified biomass charcoal. The modified biomass charcoal is reasonable in design, is simple in technology, and overcomes the technical difficulty for a long time; phosphoric acid is detained in the biomass charcoal in the form of metaphosphoric acid, and especially can form sediment substances together with active heavy metal ions under a water containing condition, thereby intensifying the passivation or fixing effect to the heavy metal ions by the biomass charcoal.

The invention provides a system for repairing polycyclic aromatic hydrocarbon contaminated soil. The system is provided with soil pretreatment equipment, chemical oxidation equipment, thermal desorption equipment, soil accumulation equipment and flue gas dust removal equipment in sequence. Conveying belts are arranged between the soil pretreatment equipment, the chemical oxidation equipment, the thermal desorption equipment and the soil accumulation equipment. The thermal desorption equipment communicates with the flue gas dust removal equipment through a pipeline. The soil accumulation equipment communicates with the soil pretreatment equipment through a pipeline. The invention further provides a method for repairing the polycyclic aromatic hydrocarbon contaminated soil. According to the system and method for repairing the polycyclic aromatic hydrocarbon contaminated soil, chemical oxidation and low-temperature thermal desorption are combined, and therefore the removal rate of polycyclic aromatic hydrocarbon of the soil can reach 99%, the repairing effect of the contaminated soil can be effectively improved, and the repairing period can be effectively shortened.

Provided is a heavy metal pollution soil repairing agent using excess activated sludge as the rawmaterial, a method of extraction and a method for repairing the heavy metal pollution soil, which relates to a heavy metal pollution soil repairing agent and a method thereof and a method for repairing the heavy metal pollution soil, and solves the problems of high cost, easily secondary pollution and complex operation existing in the repair of the heavy metal pollution soil. The heavy metal pollution soil repairing agent is composed of amylose, protein, nucleic acid, phosphoric acid, amino acid, humic acid compound, uronic acid and the organic substance required for cell lifecycle. The method for distilling the heavy metal pollution soil repairing agent is as follows: the wastewater treatment excess activated sludge reacts under the condition of 80-120 KPa and 60-100 DEG for 8-20 minutes; then centrifuges for 8-20 min at the rotating speed of 5000-7000r / min. The invention adopts the home position repairing or the heterotopia repairing to repair the heavy metal pollution. The invention has low cost and no secondary pollution, simple operation, short repairing period, strong activity and wide range of application.

The invention discloses a novel material S-CrPbCd for repairing heavy metal Cr-Pb-Cd contaminated soil as well as a preparation method and a using method of the novel material S-CrPbCd. The material comprises 5-15 percent of modified carbon nano tube, 10-60 percent of modified clay mineral and 20-60 percent of quicklime. The S-CrPbCd can efficiently adsorb Pb, Cd and Cr in the soil, and does not obviously change the soil property and cultivability. The S-CrPbCd enables the residue amount of Pb, Cd and Cr in sensitive crops to be reduced to 75-90 percent within 1-2 months, and meanwhile, the material has the characteristics of low cost, simple preparation process, no secondary pollution, quick action and easiness in large-area popularization.

The invention provides a remediation agent for heavy metal contaminated soil as well as a preparation method and a using method of the remediation agent. The remediation agent is prepared from the following components in parts by weight: 20-80 parts of a mineral material, 10-70 parts of a biomass material, 5-40 parts of a redox agent, 5-50 parts of an adsorbent and 0-30 parts of a pH regulator. The preparation method comprises the following steps: mixing the five components according to a formula ratio, grinding, and screening to obtain the remediation agent for the heavy metal contaminated soil. The using method comprises the following steps: mixing the remediation agent for heavy metal contaminated soil with compound contaminated soil, adjusting the water content of the compound contaminated soil, and carrying out soil conservation and remediation. The remediation agent for the heavy metal contaminated soil can reduce the migration and bioavailability of the soil by reducing the heavy metal leaching concentration of the soil, thereby realizing the stabilization of the soil for the various heavy metals; the remediation agent for the heavy metal contaminated soil has the advantagesof being low in cost, short in repair period, good in repair effect, wide in application range and free from secondary pollution, and the like.

The invention discloses a method of quickly repairing a cadmium polluted cultivated land by crop rotation of a cadmium super-enriching plant and an energy plant. The method comprises the following step: planting the cadmium super-enriching plant and the energy plant in the cadmium polluted cultivated land in the natural growth periods thereof for conventional cultivation to achieve the purpose ofrepairing the cadmium polluted cultivated land by means of adsorbing and enriching abilities of the cadmium super-enriching plant and the energy plant, wherein the cadmium super-enriching plant is sedum plumbizincicola and the energy plant is sorghum or oilseed rape. The invention provides a planting mode which is not limited by growth seasons. Based on one year as the repair period, the soil repair efficiency of the polluted cultivated land is increased by means of a relatively long growth period in multi-cropping plantation, and the method is short in repair period, high in operability and low in cost, and repairs the land more thoroughly.

The invention provides a method for remediating heavy metal-organic matter composite contaminated soil. The method sequentially comprises the steps of building a leaching slope, paving the soil, carrying out heterogeneous physical and chemical leaching, backfilling, carrying out in-situ biodegradation and carrying out phytoremediation. According to the method, contaminants in the soil can be rapidly and effectively degraded, the remediation period of the contaminated soil is shortened, the remediation cost is low, no secondary contamination is caused, the method is simple and feasible, the fertility of the soil in contaminated sites can be improved, and the method is suitable for remediating the contaminated sites with various scale. The method can be used for remediating the soil contaminated by heavy metal such as Mn, Pb, As and Cu and the soil compositely contaminated by the organic matter such as petroleum and polycyclic aromatic hydrocarbon.

The invention discloses a reparation device and a method thereof for the shape-righting and positioning of damaged and distorted bronze ware, belonging to the technical field of relic restoration, which is characterized in that an inner ring (4) is arranged in a damaged and distorted bronze ware (7); an inner adjusting bolt is connected with an inner gasket (6) on the inner wall of the damaged and distorted bronze through a plurality of screw holes on the inner ring (4); an outer ring (1) is arranged outside the damaged and distorted bronze ware (7); an outer adjusting bolt is connected with an outer gasket (3) on the outer wall of the damaged and distorted bronze through a plurality of screw holes on the outer ring (1); the screw holes on the outer ring (1) and the inner ring (4) are evenly distributed. The reparation device and method for the shape-righting and positioning of damaged and distorted bronze ware has an advantage that shape-righting and positioning of seriously damaged and distorted bronze ware are realized to ensure successful laser welding reparation.

The invention provides an integrated device for heavy metal contaminated soil remediation and leacheate recycling. The integrated device comprises a leaching tower, a sedimentation basin, a water suction pump, an electrochemical reactor, a circulating pump and a liquid reservoir, all of which are orderly connected into a loop through communicated pipes; the device is capable of effectively removing heavy metals in soil; the leacheate can be recycled after electrochemical treatment; the device is high in remediation efficiency, low in running cost, simple in structure, high in applicability, free of noise and small in floor area. The invention also discloses a corresponding method which comprises the steps of soil leaching, sedimentation and electrochemical treatment, all of which circularly circulate; the method is capable of effectively removing heavy metals in soil and few in leaching times; the leacheate is high in circulating leaching efficiency after electrochemical treatment; secondary pollution is avoided, and aftertreatment of the leacheate is avoided, so that the treatment cost is reduced; the method is simple and the process of the method is easy to control. The integrated device and the method are applicable to remediation of heavy metal contaminated soil and leacheate recycling.

The method of electron beam brazing repair high temperature alloy blades. The invention involves a brazing repair high temperature alloy blade method in order to solve the problems of complex repair art, long repair cycle, the need of integral heating when brazing repair, long retention period at high temperature when brazing work in original method of repair high temperature alloy blade. The method is realized by the following steps: (1) grinding off blade injury and polishing the injury part into trough, mixing the solder or alloy powder and acetone or general soldering bonding agent sold in market into cream status and putting it in groove; (2) setting process parameters and brazing; (3) when the solder or alloy powder are not melted completely, cooling it until room temperature and taking out high temperature alloy blade, the high temperature alloy blade is repaired. The electron beam brazing repair high temperature alloy blade method in the invention has simple repair process and short repair cycle, a cycle requires only 5 minutes to 10 minutes, it only heats the injury position, the retention time of blades when repaired is reduced to 0.1 ~ 10% of original method.

The invention discloses an in-situ chemical oxidation restoration method for chlorinated olefin-polluted soil and underground water, comprising the following steps of: putting a permeable reactive barrier in a reactive tank and transversely arranging a compound potassium permanganate release system in the permeable reactive barrier, wherein the compound potassium permanganate release system is prepared from paraffin, silica sand and potassium permanganate; then diluting a high-concentration TCE (Trichloroethylene) liquor on line to keep the concentration of chlorinated olefin between 0mg / L and 100mg / L, controlling the flow speed of the TCE liquor in the reactive tank at 71.4cm / d, and guiding the TCE liquor to flow in from the water inlet end of the reactive tank and flow out from the water outlet end of the reactive tank after flowing through the permeable reactive barrier to finish water treatment. When the method is used for water treatment, the removal rate of TCE after two days can reach 100% and the removal rate of the TCE can be kept at 100% through continuously restoring for thirty-three days. The method disclosed by the invention has a short restoration cycle and no secondary pollution and can be used for restoration for a long term; the potassium permanganate, the paraffin and the silica sand are cheap and easy to get; and a good chlorinated olefin treatment effect can be achieved on the premise of rational cost so that the prospect is broad.

The invention discloses application and a remediation method of calcium polysulfide in chromium-contaminated soil or underground water remediation. Calcium polysulfide is adopted for chromium contamination remediation, and two remediation methods are particularly related. The method for remediating chromium-contaminated soil by calcium polysulfide comprises the following steps: investigating the chromium contamination degree of soil, preparing a calcium polysulfide water agent, determining the adding ratio of the calcium polysulfide water agent, adding the calcium polysulfide water agent, supplying water, carrying out remediation reaction, maintaining soil and adjusting the nature of the remediated soil. The method for remediating chromium-contaminated underground water by calcium polysulfide comprises the following steps: arranging injection points, determining the amount of a remediation agent, preparing the remediation agent, positioning the injection points, injecting the calcium polysulfide remediation agent, adjusting the positions and amounts of the injection points and the like. According to the invention, the operation process is simple; the agents are stable in source; the reaction speed is high; the remediation effect is good; the chromium-contaminated soil or underground water can be stable for a long time after remediation; the remediation method can be applied to large-scale implementation, is economic and reasonable, and is a relatively ideal chromium-contaminated soil or underground water remediation technique.

The invention discloses an in-situ remediation method for polluted place based on dynamic groundwater circulation. The in-situ remediation method couples and optimizes a dynamic groundwater circulation technology and an in-situ microbial or chemical reduction / oxidation technology, pollutants are repaired, fixed, detoxified by the reduction / oxidation effect of the in-situ microbial or chemical technology, and a dynamic groundwater circulation system reduces or removes the total amount of pollution in order to improve the desorption capacity of the pollutants and repair the transmission and distribution ability of a reagent in an underground environment. The in-situ remediation method for the polluted place fully performs the respective advantages of all above technologies, makes up for thedeficiencies of the technologies, and can improve the in-situ microbial or chemical repairing efficiency, reduce the cost and the energy consumption and shorten the repairing cycle by reducing the total pollutions and carrying out microbial or chemical reduction / oxidation, fixation and detoxification.

The invention relates to a heavy metal contaminated soil remediation agent, application thereof and a contaminated soil remediation method. The heavy metal contaminated soil remediation agent comprises, by weight, 50-80 parts of sludge, 20-30 parts of biochar, 12-20 parts of organic matter, 10-20 parts of plant ash, 5-10 parts of montmorillonite clay, 5-10 parts of ferroferric oxide, 2-5 parts of sodium chloride and 3-8 parts of sodium phosphate, and preferably, the remediation agent further comprises 1-3 parts of humic acid. The invention further provides application of the heavy metal contaminated soil remediation agent and the contaminated soil remediation method. The heavy metal contaminated soil remediation agent avoids secondary pollution generated during heavy metal contaminated soil remediation, the remediation period is shortened, and the remediation effect is good.

The invention relates to a light oil polluted unsaturated zone soil in-situ remediation apparatus and a method thereof. The apparatus comprises an underground well group system, a pipeline system and a ground processing system. The underground well group system comprises an extraction well, an injection well and a ventilation monitoring well. The ground processing system comprises: an oil gas extracting and processing module which comprises a vacuum pump, an oil-gas separation tank and an oil gas adsorption tank, wherein the inlet of the oil-gas separation tank is connected with the extraction well, the outlet of the oil-gas separation tank is connected with the inlet of the oil gas adsorption tank, and the outlet of the oil gas adsorption tank is communicated with the atmosphere; a microbial enhanced remediation module which comprises a microbe and nutrient solution preparation tank, wherein a first injection solution is contained in the microbe and nutrient solution preparation tank, the microbe and nutrient solution preparation tank is connected with the inlet of a first injection metering pump, and the outlet of the first injection metering pump is connected with the injection well; and a chemical oxidation remediation module which comprises a chemical oxidant preparation tank, wherein a second injection solution is contained in the chemical oxidant preparation tank, the chemical oxidant preparation tank is connected with the inlet of the second injection metering pump, and the outlet of the second injection metering pump is connected with the injection well.

The invention discloses a repair method of cadmium and lead polluted soil and an electric-microorganism united permeable reaction wall repair device. The device comprises a reaction tank, an electrode, a power supply and permeable reaction walls, space between the two permeable reaction walls is filled with to-be-treated cadmium and lead polluted soil added with microorganisms, pollutants which are migrated to an electrode from the soil are adsorbed by the permeable reaction walls, and therefore, heavy metals including cadmium and lead are removed from the to-be-treated soil. The soil is repaired by uniting the microorganisms, an ecological adsorption material and electrodynamics, a plurality of methods are used, a plurality of systems are used in an integrated manner, the pollutants which are transferred to two poles are adsorbed and fixed through PRB, so that the heavy metals are removed from the soil, by use of the permeable reaction walls and an electric method, an electric pollutant extracting system is omitted, the repair method is close to reality, and the repair performance of an electrokinetic system is optimized. By the method, soil repair period is short, cost is low, efficiency of repair to the cadmium and lead polluted soil is high, and secondary pollution is not caused easily.

The invention discloses an advanced redox innocent treatment system and method for waste pollutants, belonging to the technical fields of pollution treatment and restoration and environmental protection. The innocent treatment system comprises a waste degradation subsystem, a waste liquid treatment subsystem, an ozone water preparation subsystem, a degradation reagent addition subsystem, a detection control subsystem and a water level control subsystem. The method comprises the following steps: determining the type of waste pollutant, selecting the degradation reagent, pouring the waste pollutant into a treating pond, carrying out advanced redox treatment on the waste pollutant, carrying out innocent treatment on the treated waste liquid, reutilizing, and carrying out biodegradation treatment on the treated soil. The system and method have the advantages of obviously higher degradation efficiency and short time consumption, can treat organic pollutants within 2-3 days, can treat heavy metal pollutants within 3-5 days, greatly shorten the pollutant treatment time, and lower the cost by more than 70%.

The invention provides an in-situ repair system and an in-situ repair method for deep layer stirring-hot air injection of polluted soil. According to the in-situ repair system, the lower end of a hot air spray pipe is communicated with a drill body core pipe in a drill; the upper end of the hot air spray pipe is communicated with an air outlet of a hot air compressor; and a mixed air-liquid pipeline is connected between a coverage cover and an air-liquid separator. According to the method, the drill is drilled in a target soil layer up and down in a reciprocating mode according to designed elevation, wherein the diameter of a stirring drill hole is 1.5 to 2.5 meters, the depth of the stirring drill hole is 9 to 12 meters, the injection pressure of hot air is 1 to 2 MPa, and the temperature of the hot air is 90 to 110 DEG C. According to the technology of the in-situ repair system and the in-situ repair method, the application range of strata can be expanded to low-middle permeable strata, and the range of the types of applicable pollutants is also increased, for example, the technology is still valid to semivolatile organic matters such as anilines. By the in-situ repair system and the in-situ repair method, the problem of 'smearing' of a soil vapor extraction (SVE) technology in the later period of repair can be solved, so that the repair efficiency is improved greatly, and the repair period is shortened greatly.

The invention provides a data restoration method, a data restoration device and a storage system. The data restoration method includes: detecting abnormal storage nodes in real time, and acquiring identification information of the abnormal storage nodes; reading index data, wherein the identification information of storage nodes of at least one data file can be obtained by the index data; and when the identification information obtained through the index data includes the identification information of the abnormal storage nodes, restoring subfiles which are located in the abnormal storage nodes and of the data files corresponding to the index data.

The invention relates to the technical field of soil remediation, and provides a remediation method and device for heavy metal contaminated soil. The contaminated soil is isolated in situ, an isolation area is formed, and the contaminated soil does not need to be transferred; the isolated contaminated soil is leached by adopting an eluting agent, the content of the heavy metals in leaching liquidis regularly detected, the leaching liquid is extracted from the isolation area after the content reaches a set value, a soil sample is collected regularly for detection in the leaching process, leaching is stopped after the soil sample passes detection, and thus the preliminary treatment and purification are carried out on the heavy metal contaminated soil in situ; and an improvement agent is added to the soil of the isolation area after leaching is stopped, remediation plants are planted on the soil after the improvement agent is added and are used for performing ecological remediation, andthus further remediation and purify are carried out. According to the remediation method and device for the heavy metal contaminated soil, the remediation cycle of the contaminated soil is greatly shortened by the dual remediation effects, moreover, a good landscape effect is achieved while remediation achieved, and the durability of the remediation effect is realized.

The invention discloses a photo-thermal composite curing 3D printing device and a hook face in-situ printing method thereof. The photo-thermal composite curing 3D printing device is composed of two sprayer systems, a three-dimensional motion platform, two feeding devices and a computer. Furthermore, the two sprayer systems include a photo-curing forming sprayer system and a temperature curing forming sprayer system, and collaborative printing of two forming technologies can be achieved. A hook face in the hook face in-situ printing method refers to printing on the hook face through a hook face layering method different from a traditional 3D printing plane layering method, and in-situ printing refers to direct printing at the artificial limb hook face defect position. A defect three-dimensional model is established by scanning the artificial limb hook face defect, a printing path is generated according to the size and shape of the defect, accordingly, sprayers are controlled to conduct three-axis linkage, the sprayers move along the defect face, and in-situ printing is finished. Furthermore, the device and method can be used for studying in the aspect of a hook face in-situ printing type skin structure and a cartilage-like structure.

The invention discloses a 3D model simulation method specific to contaminated site remediation. The method comprises the following steps: 1) determining specific pollutants according to site investigation, and performing distribution of testing sites, sampling and analysis in a suspected contaminated area; 2) combining concentration analysis data of the specific pollutants serving as sample data with a geographic position on a GEO (Geographically referenced) sensor array through a computer data acquisition module to form an integrated data file, and uploading the integrated data file to a database; 3) performing reliability and error analysis on integrated data through analytical calculation in order to perfect data, and interpolating discrete sample point data of the integrated data through a conditional simulation method to form continuous surface data; and 4) forming an interactive 3D view to be output by the continuous surface data in conjunction with a 3D visualization technology in order to form a real-time three-dimensional contamination status map. Through adoption of the 3D model simulation method, an advanced sensing technology, a computer technology, a wireless transmission technology and the like are applied to the soil / underground water remediation industry, and meanwhile the remediation efficiency of an in-situ remediation process is increased.

The invention discloses a sharp ridge repair method for an automobile stamping mould. The sharp ridge repair method comprises the following steps: S01, carrying out molded surface analysis on the automobile stamping mould, and determining a repair area and repair amount of the automobile stamping mould according to an analysis result; S02, forming a groove in the repair area, carrying out burn repair welding in the groove, and filling the groove with a welding material; and S03, according to the repair amount determined in the step S01, carrying out mechanical processing on the repair area subjected to the burn repair welding, so that the molded surface of the repair area is restored to a designed molded surface. According to the sharp ridge repair method disclosed by the invention, molded surface analysis is carried out on the automobile stamping mould to determine a local repair area, and the repair for sharp ridges is completed by virtue of local burn repair welding and mechanical processing; and in comparison with current ways of re-spotting an automobile body sharp ridge stamping mould after copying the automobile body sharp ridge stamping mould or re-spotting the automobile body sharp ridge stamping mould after carrying out integral reduction milling on the mould or making two sets of same convex moulds, a backup of each other, for a new project mould, the cost is greatly reduced, and the repair period is shortened.

The invention relates to a method for repairing cadmium contaminated soil and provides a method for repairing soil cadmium contamination through titanium gypsum. The method is short in repairing period, low in cost and free of secondary pollution to the soil, and improves the use value of waste solid titanium gypsum. After the cadmium contaminated soil steeps in the field, the titanium gypsum is evenly added into the soil, and the water content of the soil keeps 30-40% of the field capacity; the raw titanium gypsum comprises CaSO4, Fe2O3, MgO, Al2O3, SiO2, P2O5 and TiO2; the Fe2O3 exists in a ferric hydroxide colloid form. The method has the beneficial effects that the titanium gypsum is added into the soil, so that the pH, CEC and Eh of the soil are effectively improved, the content of cadmium easily absorbed by plants is reduced, the bio-availability of the cadmium is decreased, and the repairing period is short; the titanium gypsum contains a large number of microelements needed by growth of plants, such as Fe, Mg, Ca and S, so that the yield of crops is improved, and no pollution is generated to the soil; efficient utilization of the titanium gypsum soil is achieved, the cost is low, and popularization is easy.

The invention relates to a remediation agent for heavy metal cadmium contaminated soil. The remediation agent is prepared from the following raw materials in parts by weight, 100-400 parts of limestone, 100-400 parts of biochar, 10-30 parts of calcium magnesium phosphate fertilizer and 50-200 parts of clay. The sources of the raw materials of the remediation agent are natural, no secondary pollution is caused to soil, the cost is low, and the remediation effect is obvious; the bioavailability of cadmium in a remedied cultivated land is obviously reduced, the environmental quality is obviouslyimproved, and the remediation period is short; the remediation agent has the effect of long-term sustained release, and has the good effect all the time through observation for up to ten years; and apreparation method of the remediation agent is simple, when the remediation agent is applied, applying time is in a normal cultivated land turning-over stage, no extra turning-over step is added, damage to a soil structure is reduced, and the remediation agent has a good application prospect in the aspect of remediation for the large-scale heavy metal cadmium contaminated cultivated land.

The invention discloses a cadmium-arsenic composite polluted soil remediation agent, which comprises the following raw materials in parts by weight: 0-10 parts of hematite; 20-30 parts of ferrous sulfate; 10 parts of manganese dioxide; 15-20 parts of fly ash; 10-15 parts of quicklime; 10-15 parts of sepiolite; 10-15 parts of calcium dihydrogen phosphate; and 0-10 parts of wollastonite. The remediation agent enables cadmium and arsenic heavy metals to form stable chemical forms through oxidation reduction, adsorption, ion exchange, precipitation or coprecipitation and the like to reduce the migration and diffusion capability of the cadmium and arsenic heavy metals in the environment, so that the ecological environment risk of the cadmium and arsenic heavy metals is reduced; and the remediation agent has the advantages of high remediation efficiency for cadmium-arsenic composite polluted soil, short remediation period, low remediation cost, easily available raw material components and simple application method, so that the agent is one of the few remediation agents in the industry that simultaneously act on yin and yang heavy metal ions.

The invention relates to a method for chroming a stainless steel conductive roller. The method comprises roller body surface polishing, oil removing, cleaning, roughing and peak clipping treatment and is characterized by comprising the following steps of: adding 135+ / -10 grams of nitric acid (HNO3), 165+ / -5 grams of hydrogen chloride (HCl), 30+ / -3 grams of hydrogen fluoride (HF) and 2 grams of hexamethylene tetramine (C6H12N4) sequentially into 770 millimeters of water; stirring the mixture uniformly; preparing peak-clipping burr-removing liquid at normal temperature; scrubbing the surface of the roughened layer of the conductive roller for 15 to 20 minutes by using the peak-clipping burr-removing liquid; preparing chroming liquid in a ratio of chromic anhydride (CrO3) to sulfuric acid (H2SO4) of 100 to 1.15; and after washing the stainless steel conductive roller cleanly, placing the cleaned stainless steel conductive roller into a horizontally chroming tank to power on and perform electroplating. The method has the advantages of: by a peak-clipping burr-removing liquid corrosion method, the problem that waste edges and scraps after the roughing process are difficult to remove due to high toughness of stainless steel is solved and the chromed stainless steel conductive roller does not scratch the surface of a steel plate due to the burr; a chroming layer is bonded with a matrix firmly by the electroplating process, so the chroming layer does not fall off and has high wear resistance; the stainless steel conductive roller has a long service life, a short repair cycle of only 2 to 3 days and cost of one fifth of that of a copperized conductive roller.