290results about How to "Reduce the risk of secondary pollution" patented technology

The invention provides a river surge silt d harmless and recycling treatment method. In the method, a dredger is utilized to suck silt, the silt is sent into a biochemical treatment pond from the ship through a silt transmission pipeline, compound enzyme is utilized to carry out bioremediation, gravels and sands with the particle size bigger than 1mm are filtered out by a primary hydrocyclone and a vibration screen, sands with the particle size of 0.075-1mm are filtered out by a secondary hydrocyclone and the vibration screen, powdery particles with the particle size of 0.025-0.075mm are filtered out by a third-level hydrocyclone and the vibration screen, powder particles are further separated out from outlet silt tail water through a sediment tower, sewage from the sediment tower is filtered by utilizing a fiber filter after flocculant is added into the sewage, and powdery particles are deposited from backflushing silt after being filtered by utilizing the sediment tower again, and the powdery particles are dehydrated by the third-level hydrocyclone and the vibration screen after entering a sludge pool and are cured by a curing agent after dehydration. The method has high resource utilization ratio, meets the requirements for the environmental protection, particularly carries out stage treatment on the silt, lowers the cost and enhances the efficiency.

The invention discloses a recycling harmless treatment method of stainless steel pickling waste water, belonging to the toxic and harmful industrial waste water treatment field. The method comprises the following steps of: 1) recycling inorganic acids by an acid separation method: pumping stainless steel pickling waste water in which suspended matters are removed through filtering into a resin column so that the inorganic acids are absorbed on the resin; 2) removing impurities by a goethite method: pumping heavy metal ion solution into a reaction kettle, adjusting pH to a range from 3.5 to 5.0, and continuing reacting for 30-90 min, thereby removing iron, chromium and fluorine in the heavy metal ion solution in the form of dregs; 3) recycling nickel by a neutralized sedimentation method: feeding an alkaline liquor to nickel solution to adjust pH to a range from 9.5 to 12.5, and filtering and washing the filter residues, thereby obtaining nickelous hydroxide; and 4) performing harmlesstreatment on the dregs: after washing the dregs, adding lime powder to the dregs to realize stabilization treatment of harmful elements. The method is simple in operation and convenient for management; the high-concentration inorganic acids and nickel and the like contained in the waste water are all recycled, and simultaneously the generated dregs are harmlessly treated; and therefore the integration of economic benefit,environmental benefit and social benefit is realized.

The invention discloses a device and a method for indirect thermal desorption disposal of persistent organic pollutant contaminated soil. The device comprises a contaminated soil pretreatment system, a feeding system, a thermal desorption system, a discharging system, a tail gas purification system and an automatic control system, wherein the contaminated soil pretreatment system is connected with a feed opening of the thermal desorption system through the feeding system, a solid discharge opening of the thermal desorption system is connected with the discharging system, and a gas discharge opening of the thermal desorption system is connected with an inlet of the tail gas purification system. According to the method, after pretreatment, contaminated soil is conveyed to the thermal desorption system for desorption for 10-40 min at the temperature of 400-600 DEG C, and desorption exhaust gas adopts a technology including procedures of cyclone dust removal, two stages of spraying, drying and activated carbon adsorption / gliding arc degradation. The device and the method adopt indirect heating, so that risks of generation of poisonous materials such as dioxine and the like are avoided effectively; and a double-layer cylinder rotary kiln type furnace body, the furnace body axis and the ground form a 0-degree angle, and accordingly, the operation and maintenance costs are reduced.

The invention discloses an aerobic treating process for a refuse landfill, which belongs to the field of environmental protection. The process is used for treating a landfill by using an aerobic biological method. An aerobic treating system comprises an air injection system, an air sucking system, a water injection system, a filtering and discharging system and a monitoring system. Degradable organic matters in refuse are degraded rapidly mainly through an aerobic biological reaction, so that the refuse is in a stable state. In the treating process, gas generated by the aerobic biological reaction of the refuse is mainly carbon dioxide. Refuse leachate is not discharged outwardly, but is directly consumed in the refuse landfill by recharging, so that the environment is protected from being polluted. After treatment, gas and leachate which cause environmental pollution are not generated, so that the treated landfill is stable.

The invention provides a treating method of arsenic in waste acid, which comprises the steps of enabling arsenic in waste acid to form amorphous ferric arsenate precipitation under the conditions of lower Fe / As molar ratio and a certain pH value, adding acid for re-dissolution, heating, carrying on enrichment and concentration on the arsenic in the waste acid, and finally forming stable scoroditecrystals to remove the arsenic in the waste acid, so that the iron usage amount is greatly reduced, the economic cost is reduced, the slag amount is reduced, simultaneously the cost for high temperature transforming heating is reduced, stable solid waste containing arsenic can be obtained, and the secondary pollution to the environment due to the solid waste containing the arsenic can be reduced.

The invention provides a novel kitchen garbage fermentation device and a usage method, which belongs to the environmental protection device field. The device provided by the invention comprises a U-shaped fermenter, a feed inlet, a discharge port, a fragmentation stirrer, a variable frequency motor, a blower, a ventilation duct, an air vent, a microbe inlet pipe, a charging nozzle, an electric heating pipe, a water interlayer, a protection layer, a deodorizing tower, a support and the like. The fragmentation stirrer is composed of a stirring horizontal shaft, a blade support and a triangle cone blade with arc bottom. Several electric heaters are arranged in the interlayer of a double layer U-shaped fermenter. The variable frequency motor drives the fragmentation stirrer to perform fragmentation stirring on the kitchen garbage. The electric heating pipe heats the water interlayer so that the temperature of the fermenter can be kept between 40-60 DEG C, air is introduced in the ventilation duct through the blower, and a microbe liquid bacteria agent is inoculated in the fermenter through a nozzle on the microbe inlet pipe. The product is discharged out of the fermenter through the discharge port, thereby the minimization of the kitchen garbage can be realized, and the product can be used as a soil organic fertilizer conditioning agent.

The invention provides an elution repairing device and a repairing method of arsenic polluted soil and wastes. The elution repairing device is formed by a spraying device, an eluting groove, a material unloading switch, a filtering anti-blocking device, a waste liquid sampling opening, an eluting waste liquid treating tank, an arsenic adsorption device, an arsenic adsorption material replacing switch, an eluting filtering liquid storage tank, a first liquid gauge, a first electric pump, an eluting agent storing tank, a dry powder hopper, a material adding motor, a level meter, a first solenoid valve, a tap water inlet pipeline, an agitating device, a second liquid gauge, a solution concentration detection device, a second solenoid valve, a second electric pump, a flow meter, an eluting agent conveying pipeline, an alarm, a touch screen operation system, a master switch and an electric control cabinet. According to the elution repairing device and repairing method of the arsenic polluted soil and the wastes, an eluting system, an eluting waste liquid recycling system and a control system are organically combined together to form a set of a dislocated elution repairing device with a low secondary pollution risk; the high-concentration arsenic polluted soil and the wastes can be rapidly and efficiently repaired; and meanwhile, low emission is realized, and the elution repairing device and repairing method are energy-saving, efficient, safe and environment-friendly.

The present invention belongs to the technical field of air purification, and particularly relates to a graphene oxide / titanium dioxide-active carbon three-dimensional composite material and a preparation method thereof, wherein a graphene oxide / titanium dioxide composite material is directly and densely adhered onto the surface of an active carbon filtration screen or a carbon fiber net so as to obtain the three-dimensional composite material. According to the present invention, the graphene oxide / titanium dioxide-active carbon three-dimensional composite material can provide excellent adsorption performance and excellent photocatalytic degradation performance on formaldehyde, wherein photocatalytic degradation is performed after formaldehyde is adsorbed, such that the actual removal of the formaldehyde can be achieved, and the secondary pollution caused by the desorption of the formaldehyde can be prevented; and after the adsorption degradation treatment is performed with the composite material of the present invention, the removal rate of the low concentration formaldehyde (concentration of 1.0 mg / m<3>) in the home within 10 h is up to 82.5-95.6%.

The invention discloses a heat recovery fresh air unit, which comprises an air intake unit; the inside of the air intake unit is orderly provided with a filter section, a heat-moisture treatment section and a fan section; the inside of the filter section is provided with a fresh air intake and an air filter; the inside of the heat-moisture treatment section is provided with a water cooling coil, a direct evaporation type coil and a reheating coil; the inside of the fan section is provided with a fan and an air supply outlet; the water cooling coil is provided with water inlet pipe and water outlet pipe connectors; and the direct evaporation type coil and the reheating coil are provided with refrigerant inlet and outlet connectors. The heat recovery fresh air unit is characterized in that: the heat recovery fresh air unit also comprises an air outlet unit; the inside of the air outlet unit is orderly provided with a filter section, a heat recovery section and an air exhaust section; the inside of the filter section is provided with a return air inlet and an air filter; the inside of the heat recovery section is provided with a compressor and a condensing coil; and the air exhaust section is provided with a fan and an exhaust outlet. The heat recovery fresh air unit is provided with the air outlet unit, solves the problem of temperature and humidity control in the indoor environment, and can recover heat to further improve energy utilization rate.

The invention belongs to the wet metallurgy and environmental protection technical fields, and particularly, discloses a method for treating arsenic in arsenic-containing industrial wastewater. Under a condition of high temperature, an iron solution is slowly added into the arsenic-containing industrial wastewater, arsenic in the wastewater forms a stable scorodite crystal (FeAsO4.2H2O), and thus arsenic in the wastewater is removed. The method is simple in process, can obtain the stable arsenic-containing solid waste, and reduces secondary pollution caused to the environment.

The invention discloses a novel method for treating waste water of heavy metal with low concentration. The waste water containing heavy metal ions is collected in a regulation water tank and certain amount of anion surfactant is added to achieve the critical micelle concentration so that the metal ions and the surfactant are strongly chelated; then, the obtained substance is filtered by tangential flow of ultrafiltration membrane and the filtered water is discharged or recycled; concentrated solution is cycled and returned back to the regulation water tank and after achieving certain concentration ratio, the obtained solution is transferred to an electrolyzer; the metal ions in the electrolyzer are reduced and precipitated and the surfactant and the metal ions are desorbed and flown back to the regulation water tank for recycling. The process for treating the heavy metal ions in the industrial wastewater with low concentration has high recycling rate, low energy consumption and no secondary pollution. The process is in particular applicable to desulfurization and plating of the industrial waste water polluted by the heavy metal.

The invention discloses a method for improving the repairing efficiency of heavy metal polluted plants. The method comprises the following steps: growing plants with an enriching or super-enriching ability to heavy metal on heavy metal polluted soil or water; when the main stems of the plants grow leaves, spraying a heavy metal pollution repairing improver on the leaves; removing heavy metal pollutions by harvesting dead leaves of the plants in plant growing season. The method has the advantages that not only can the repairing efficiency of the heavy metal polluted plants be improved, but also heavy metal poisoning the plants can be reduced or removed, and the application range of heavy metal polluted plant repairing is extended.

The invention discloses a cleaning method for repairing heavy metal contaminated soil. The method is characterized by comprising the following steps: (1) adding water and an oxidant to heavy metal contaminated soil, wherein the oxidant is hydrogen peroxide; (2) adding an acid and a salt to the mixture obtained from the step (1), wherein the acid is any one or combination of hydrochloric acid and sulfuric acid; the salt is any one or combination of CaCl2 or FeCl3; and (3) carrying out solid-liquid separation on the mixture obtained from the step (2), adjusting the pH value of the obtained liquid to be 8-9, adding a flocculant, standing, participating and separating, wherein the flocculant is any one or combination of polyacrylamide and aluminum polychlorid. The repairing method disclosed by the invention has the advantages of being easily available in raw material, proper in cost, simple in preparation, good in repairing effect and the like; the combined adding ratio of medicines is determined according to the soil contamination degree and the physicochemical property, so that waste of the medicines caused by excessive repair is avoided; and the risk of secondary pollution is reduced.

The invention discloses a preparation method for increasing the particle load capacity of a multifunctional hybrid membrane, and belongs to the technical field of membrane separation for wastewater treatment. The preparation method for increasing the particle load capacity of the multifunctional hybrid membrane comprises the following steps: pre-dispersing a granular material to obtain a dispersion, uniformly mixing the dispersion with a membrane matrix composition composed of a polymer and an organic solvent in order to form a mixed solution, heating the mixed solution to removing a dispersant to a membrane casting solution, knife-coating the matrix carrier with the membrane casting solution, and carrying out phase conversion to remove the organic solvent in order to produce the multifunctional hybrid ultrafilter membrane. Nano-particles are pre-dispersed by the dispersant to improve the dispersibility of the granular material in the film; and the viscosity and the concentration of the membrane casting solution are ensured by removing the dispersant. The method can keep the ultrafiltration performance and the permeation performance of the multifunctional hybrid membrane under a high particle load capacity, and also can improve the treatment effect of the unit mass of the granular material.

The invention relates to the field of battery application and energy restoration, in particular to a method for restoring battery capacity in situ. The method comprises the following steps: after a long-term charge-discharge use, taking positive electrolyte of a vanadium battery with a fading capacity as a raw material, adding an organic, inorganic or composite reductant into the positive electrolyte, and performing reduction reaction on the reductant and pentavalent vanadium ions in the positive electrolyte so as to reduce the pentavalent vanadium ions into tetravalent vanadium ions and restore the battery capacity. By adding a proper proportion of organic-inorganic reductant into the positive electrolyte, the capacity fading problem in a running process of the battery is solved and recycle of the battery electrolyte is achieved; and the method is simple in process, easy to operate, easy to obtain the raw material and obvious in effect.

The invention belongs to the field of groundwater pollution remediation. A purpose of the invention is to provide an in-situ oxidation circulation extraction remediation system and a remediation method for organic contaminated underground water. According to the system and the method, the real-time monitoring and evaluation of the in-situ oxidation remediation effect of organic polluted underground water can be realized, the agent adding frequency is effectively guided, the secondary pollution risk is reduced, the agent cost is saved, and the construction period is shortened. According to thetechnical scheme, the in-situ oxidation circulation extraction remediation system for organic polluted underground water comprises an in-situ oxidation system, a circulation extraction system and a monitoring system, wherein the circulation extraction system comprises an extraction well arranged in an organic pollution area, an injection well arranged around the extraction well, at least an extraction pump arranged in the extraction well, at least an extraction pipe extending into the extraction well and communicated with the extraction pump, and a circulation injection pipe extending into theinjection well and communicated with the extraction pipe.

The invention relates to a treatment method of yellow phosphorus-contaminated soil. The treatment method is characterized by stirring the yellow-phosphorus-contaminated soil into mud through a physical way and reasonably screening; firstly activating yellow phosphorus particles by using an oxidizing agent through the principle of chemical reaction, thereby increasing the specific surface area of the yellow phosphorus particles; converting high-toxicity yellow phosphorus into non-toxic phosphate through processes of disproportionation reaction and the like by using a disproportionation reactant, thereby realizing safe treatment of the yellow phosphorus-contaminated soil. The treatment method of the yellow phosphorus-contaminated soil, disclosed by the invention, can be used to effectively remove residual yellow phosphorus in the soil, and has the characteristics of safety and environment protection, low treatment cost, small secondary pollution risk and good treatment effect. The soil treated by the method has better reutilization value, contains higher-concentration phosphorus elements, and can be used as soil for green belts or forest land since physicochemical properties are not remarkably changed.

The invention provides a method for treating degradation-resistant organic pollutants in waste water and overcomes the defect that iron nanoparticles are prone to agglomeration when the iron nanoparticles are subjected to waste water treatment in the prior art. In order to solve the technical problem, the technical scheme includes that the method includes the following steps: under the pneumatic ultrasonic action, adjusting pH to be 1-5, adding ferrous ion salt, casting the iron nanoparticles in, adding hydrogen peroxide, performing solid-liquid separation after the pneumatic ultrasonic action, and discharging the waste water after the waste water reaches the standard. Comparing a pneumatic ultrasonic field with a common electric ultrasonic field, dispersion and radiation range can be widened, and the iron nanoparticles can be dispersed in the waste water more easily; air serves as a medium generating the pneumatic ultrasonic field, functions of an oxidizing agent (O2), stirring and cutting are provided for a waste water treating system, but only an air compressor generating the pneumatic ultrasonic field is energy-consuming equipment, so that energy-saving effect is achieved.

The invention discloses a method and a device for removing heavy metals and POPs in organic wastes by electromagnetic reinforcement. The method comprises the following steps of: firstly preparing theorganic wastes into slurry; applying a magnetic field to the slurry to make sure that the heavy metals and the POPs in the slurry are transformed into a water solution state; separating the organic waste slurry into two components; afterwards applying an electric field to the slurry, migrating water molecules and the heavy metals and POPs which are continuously transformed into the water solutionstate to a cathode region of the electric field under the effect of electro-migration, and meanwhile migrating the components of the organic wastes to an anode region of the electric field so as to realize separation of the two components; and filtering and dehydrating the organic waste slurry to finally obtain harmless low-water-content organic wastes. The method and the device disclosed by the invention can be used for efficiently removing large-particle impurities, some heavy metals and the POPs in the organic wastes, can also reduce the water content of the organic wastes to 30% to 50%, thereby overcoming the defects that a traditional organic waste treatment method is low in efficiency, takes effect slowly and has no oneness.

The invention discloses a method for remedying heavy metals in domestic waste leakage solution, which comprises the following steps: sowing lawn plants on a plastic net based on 20-40g / square meter and culturing the lawn plants by irrigating Hoagland nutrient solution; after the lawn plants are cultured for 30 days, pouring the nutrient solution out completely, transplanting the lawn plants to the domestic waste leakage solution containing EDTA and continuing soilless culture on the lawn plants until germination; after the lawn plants are processed in the domestic waste leakage solution for 7-30 days, harvesting Lolium perenne L or Festuca arundinacea L and determining the contents of the heavy metals in the domestic waste leakage solution, on the overground parts and in the root systems of the lawn plants, thereby achieving the remediation effects of the lawn plants on the heavy metals in the domestic waste leakage solution. The technical method of the invention can effectively reduce the contents of such heavy metals as Pb, Cu, Zn, Cd, Cr and Ni in the leakage solution and features simple technical operation process, obvious economic and environmental benefits and broad application prospect.

The invention relates to a base-catalyzed decomposition device and method for industrial waste containing a chlorinated organic compound. A reaction system of the device is communicated with chlorinated organic polluting waste via a reaction reagent mixing device, communicated with a nitrogen gas protection system, connected with a temperature control system, communicated with a residue processing device via a deposition and centrifugal separator, and communicated with a secondary activated carbon absorption tower via a condensing reflux device, tail gas from the secondary activated carbon absorption tower is released into the atmosphere, and the deposition and centrifugal separator is communicated with the pipeline of the reaction reagent mixing device; and the decomposition method comprises the following steps of: firstly, adding the chlorinated organic pollutant, the hydrogen donors from the reaction reagent mixing device and the like into the reaction system; secondly, starting the nitrogen gas protection system; and finally, heating and stirring to realize base-catalyzed dechlorination decomposition of the pollutant. The decomposition method has the advantages of high reaction rate, low reaction temperature, small temperature fluctuation of the reaction system, large actual reaction quantity of the pollutant and small risk of secondary pollution.

The invention provides a method for reducing slope cropland non-point source pollution by a biochar-improved ecological ridge, and relates to building of a telescoping ecological ridge based on ADP(NH4H2PO4) modified biochar. A layout method provided by the invention comprises the steps: firstly establishing ridges at a preset interval in a direction vertical to the slope surface of a slope cropland, wherein each ridge is formed by piling up soil mixed with biochar with a preset proportion and forms a buffer strip; forming drain holes with a preset number in each buffer strip, digging a deep pit at the rear end of each drain hole, and arranging a telescoping purification device in each deep pit, wherein each telescoping purification device is formed by combining three layers, i.e., stone strips, biochar strips and clay strips and forms a filter strip; establishing a drainage channel at the rear end of the last filter strip close to the base of a slope and connecting with a riverway, so as to form a complete ecological ridge layout. By adopting the method, the nutrient substance and water utilization efficiency of the existing slope cropland can be improved, and the problems that due to surface runoff and underflow, silt flows down and migrates, and pollution by heavy metal and organic pollutants occurs can be effectively prevented.

The invention discloses a black and odorous water treatment agent and an application thereof. The treatment agent is prepared from components in parts by mass as follows: 330-500 parts of a flocculating agent, 110-174 parts of an adsorbent, 170-225 parts of a settling agent, 140-190 parts of a water softener, 160-210 parts of an oxidizing agent, 140-165 parts of a purifier, 170-240 parts of an ionexchanger, 90-160 parts of a chelating agent, 8-30 parts of bacillus powder, 5-30 parts of desulphurization bacterium powder and 8000 parts of zeolite particles. The invention provides the application of the black and odorous water treatment agent to treatment and repair of black and odorous water. With the adoption of the treatment agent, quality of the black and odorous water can be changed ina short time and enabled to reach the surface water class-VI standard. When the treatment agent is applied to in-situ treatment of the black and odorous water, the investment is reduced by 60% or morecompared with that of an ex-situ treatment technology for bottom mud, secondary pollution risk of the bottom mud for atmosphere, soil and underground is greatly reduced, and the restoration time is short.

The invention provides a preparation method of a ceramisite filter material for water treatment, comprising the following steps: naturally air-drying sewage sludge and water supply sludge; respectively grinding and smashing clay and the air-dried water supply sludge and sewage sludge, and filtering by using a sieve after smashing; detecting the percentage contents of SiO2, Al2O3, Fe2O3, CaO, MgO, K2O, Na2O and organic matters in the clay, the water supply sludge and the sewage sludge: detecting the following chemical components in powder after mixing, and if a following ratio is not reached, adding absent substances, so that a mixture meets a certain ratio as follows; adding water in the mixture, stirring until a sticky state is formed, and then putting into a ball forming mill for ball forming, wherein the addition amount of the water is 36-44 percent of the weight of the mixture; putting a pellet at a cool and ventilated place, and naturally drying for 24h; putting the pellet into a muffle furnace, adjusting the temperature to 395-405 DEG C, and preheating for 10min; heating up for firing, and keeping a constant temperature for 20min after the in-furnace temperature of the muffle furnace is increased to 1200 DEG C; after completely firing the ceramisite filter material, taking out the ceramisite filter material, and naturally cooling to room temperature.

The invention discloses a rubber plug conveying system used between a rubber plug cleaning machine and a filling and plugging machine. The rubber plug conveying system comprises a rubber plug conveying pipeline, an inlet end of the rubber plug conveying pipeline is connected with a plug outlet of the rubber plug cleaning machine, an outlet end of the rubber plug conveying pipeline is connected with an upper plug station of the filling and plugging machine, and the horizontal height of the rubber plug conveying pipeline is gradually reduced from the inlet end to the outlet end. The rubber plug conveying system is simple in structure and low in cost, and the risk of secondary pollution of rubber plugs can be reduced.

The invention discloses a preparation method and application of a tetracycline-polluted water body restoring material. A preparation method of nanometer cerium dioxide comprises the following steps of (1) adding cerium nitrate and surfactant into water, mixing and stirring, so as to obtain a mixed solution A; (2) adding an ammonia carbonate solution into the mixed solution A, and stirring, so as to obtain a mixed solution B; (3) filtering the mixed solution B, washing and drying the obtained precipitate, calcining, and grinding into powder, so as to obtain the nanometer cerium dioxide. The invention also discloses a preparation method of the nanometer FeO@CeO2 (ferrous oxide@cerium dioxide) by using the nanometer cerium dioxide, and a restoration method of the tetracycline-polluted water body by using the nanometer FeO@CeO2. A heterogeneous Feton technique using the FeO@CeO2 as a catalyst is proposed to prepare the FeO@CeO2 to be applied into the restoring of the tetracycline pollution in the water body, so that the reaction activity is improved, the mineralizing degree of the tetracycline is improved, and the risk of secondary pollution is reduced.

The invention relates to the field of battery application and energy recovery and particularly relates to a method for removing copper ions from copper-containing vanadium liquid. The method is used for solving problems in the reutilization, recovery and the like of a copper-containing electrolyte in the prior art. According to the method, a vanadium battery electrolyte which is used for a long time and contains the copper ions is taken as a raw material, an organic-inorganic reducing agent and a decoppering agent are added in a proper proportion within a certain temperature range, and then, the copper ions are removed from the liquid. The method for removing the copper ions from the copper-containing vanadium liquid has the advantages that the process method is simple, the operation is easy, the raw material is easily available, the copper removal ratio is above 85%, and the copper removal effect is remarkable.

The invention discloses a biogas residue liquid processing method suitable for large biogas digesters. The method comprises the steps of biogas residue liquid collection, flocculation standing, solid-liquid separation, dehydration and purification. The dehydration rate is improved through flocculation, standing solid-liquid separation, pre-dehydration and dehydration steps, so the utilization values of the biogas residue liquid are improved, and the treatment efficiency of the biogas residue liquid is improved; and additionally, biogas residues and a biogas liquid are not leaked in the whole treatment process, and are recovered respectively, so the utilization rates of the biogas residues and the biogas liquid are improved, and secondary pollution risks are reduced.

The invention relates to a method for removing mercury ions in water by using a magnetically-modified carbon nano tube and a method for regenerating the magnetically-modified carbon nano tube. According to the method for removing the mercury ions in the water, the material of the magnetically-modified carbon nano tube is put into the water to be treated to adsorb the mercury ions in the water; and iron oxides are wrapped or loaded on the material surface of the magnetically-modified carbon nano tube. According to the method, the loaded iron oxides have soft magnetism, so the solid-liquid separation of an adsorbent and a solution can be implemented conveniently under the action of an additional magnetic field; and the magnetically-modified carbon nano tube can be regenerated by the elution of an acid solution, so that the water treatment cost is saved, the possibility of secondary pollution is reduced, and the magnetically-modified carbon nano tube has good economic and environmental benefits.