124 results about "Phosphorus adsorption" patented technology

The invention discloses a special phosphorus removal agent for deep phosphorus removal and a preparation method and application thereof, and relates to the field of phosphorus removal agents and preparation methods thereof.The phosphorus removal agent is prepared from a porous precursor, an activating agent and a dispersing agent, and the porous precursor comprises at least one of aluminum oxide, iron oxide, calcium oxide and magnesium oxide; the activating agent comprises at least one of lanthanum salt, cerium salt, zircon salt, magnesium salt and ferric salt. By optimizing the composition of the porous precursor and activating treatment, the phosphorus adsorption capacity is remarkably improved, the phosphorus removal agent also plays a role in micro-flocculation in the process of mixed adsorption with sewage, a wet adding mode is adopted, the adding amount can be flexibly adjusted according to the phosphorus concentration condition of inlet water and outlet water, and the phosphorus removal efficiency is improved. The phosphorus removal agent can reduce the total phosphorus concentration in tail water of a sewage treatment plant to 0.5 mg / L or below.

The invention belongs to the technical field of wastewater treatment, and particularly relates to multi-element doped synergistically modified ferrihydrite as well as a preparation method and application thereof, and the ferrihydrite is doped with at least one rare earth element and at least one of an aluminum element and a silicon element; the doping amount of the rare earth elements in the ferrihydrite is 0.5-20wt%; the doping amount of the aluminum element in the ferrihydrite is 0-20wt%; the doping amount of the silicon element in the ferrihydrite is 0-20wt%. Compared with the prior art, the method solves the problems that in ferrihydrite single-element modification in the prior art, although stability is improved through Al / Si doping, element modification in the same period is limited in improvement of the adsorption capacity, and the specific recognition capacity on phosphate radicals cannot be improved; and the anti-interference performance of the rare earth doped in the complex water matrix still needs to be improved. According to the scheme, rare earth and Al / Si doping are combined, so that improvement of phosphorus adsorption stability, adsorption capacity, specific recognition capability and anti-interference performance of ferrihydrite is realized synergistically.

The invention discloses a cellulose / chitosan / lanthanum oxide composite material for efficiently removing nitrogen and phosphorus from a water body. The composite material is mainly prepared from the following raw materials: bacterial cellulose, chitosan, lanthanum nitrate hexahydrate and sodium hydroxide. By regulating and controlling the dosage of raw materials such as chitosan, lanthanum nitrate hexahydrate, sodium hydroxide and the like in the synthesis process of the material, the process parameters of material preparation are optimized, so that the optimal nitrogen and phosphorus removal performance is achieved. The practical application capability of the material is verified by evaluating the nitrogen and phosphorus removal performance, the application stability and the environmental factor influence of the material. The development of the material solves the problems that an environmental functional material is high in preparation cost, low in adsorption capacity, poor in selectivity and incapable of removing nitrogen and phosphorus at the same time. Theoretical support is provided for preparation of the nitrogen and phosphorus removal adsorption composite material for the water body, and meanwhile, the composite material has a wide practical application prospect.

The invention provides a preparation method of phosphorus adsorption bottom mud ceramsite for recycling river channels, which comprises the following steps: uniformly mixing dredged bottom mud, domestic sludge and fly ash according to a certain proportion, adding water, stirring and granulating to prepare raw ceramsite, and drying; the adding proportion of the dredged sediment is 24.3 wt%-96.3 wt%, the adding proportion of the domestic sludge is 0 wt%-32.6 wt%, and the adding proportion of the fly ash is 3.71 wt%-52 wt%; and sintering the dried raw ceramsite, and cooling to obtain the ceramsite. The invention also discloses the phosphorus adsorption bottom mud ceramsite prepared by adopting the method, and application of the phosphorus adsorption bottom mud ceramsite in wastewater phosphorus removal and application of the phosphorus adsorption bottom mud ceramsite in river channel water body phosphorus removal. According to the scheme, a new thought is provided for disposal of dredged bottom mud, domestic sludge and fly ash waste, the influence of the raw materials on the phosphorus adsorption capacity and the porosity is more accurately studied from the raw material components, and the ceramsite adsorbent with excellent performance is obtained.

The invention relates to application and a method of phosphorus adsorption resin for selectively adsorbing phosphorus from phosphorus-containing wastewater. The phosphorus adsorption resin comprises weak acid cation exchange resin and Fe < 3 + > loaded on the surface of the weak acid cation exchange resin; the pH value of the phosphorus-containing wastewater is 0.8-3.0, the phosphorus concentration is 0.1-5 g / L, and the wastewater further contains 0.1-1 g / L of Ca; the phosphorus adsorption resin is prepared by the following steps: i) carrying out contact reaction on weak acid cation exchange resin and a ferric salt solution, wherein the ferric salt is selected from one or more of ferric sulfate, ferric chloride, ferric nitrate, ferric citrate and ferric tartrate; and ii) after the reaction is completed, carrying out solid-liquid separation to obtain the Fe < 3 + >-loaded phosphorus adsorption resin. According to the method, high-selectivity adsorption (larger than or equal to 95%) of phosphorus can be achieved, the phosphorus and calcium separation effect is good, the iron-calcium ratio in the phosphorus-enriched strip liquor is larger than or equal to 800, and the method can be used for preparing battery-grade iron phosphate.

The invention discloses a lanthanum-loaded nano-structure composite phosphorus removal material, and belongs to the field of environmental functional materials. The lanthanum-loaded nano-structure composite phosphorus removal material comprises a polymer carrier and hydrated lanthanum oxide particles loaded in the polymer carrier, the particle size of the polymer carrier is 0.2-1mm, the average particle size of the hydrated lanthanum oxide is less than 10nm, the loading capacity of the hydrated lanthanum oxide in the lanthanum-loaded nano-structure composite phosphorus removal material is 3-20%, and the loading capacity of the hydrated lanthanum oxide in the lanthanum-loaded nano-structure composite phosphorus removal material is 3-20%. The crosslinking degree of the polymer carrier in the lanthanum-loaded nano-structure composite phosphorus removal material is 2-5%, the material can be used for adsorbing phosphate in water, and the phosphorus adsorption capacity of the material is remarkably superior to that of other materials such as an iron material and a zirconium material. Moreover, the loaded lanthanum nano-particles are small in size, but the problems that nano-materials are prone to agglomeration and inactivation, difficult to recycle and the like are solved, meanwhile, the lanthanum with the small nano-particle size can improve the specific surface area and the surface active site concentration of the lanthanum, the nano-effect is fully played, and the high adsorption capacity of phosphorus is shown.

The invention discloses a sewage treatment method based on reinforcement of composite magnetic nanoparticles, and belongs to the technical field of sewage treatment, and the sewage treatment method comprises the following steps: 1, pretreatment: intercepting large-particle-size floating objects in wastewater by using a grid, and stirring by using an adjusting tank to uniformly mix water; in the second step, composite magnetic nanoparticles are added into the pretreated wastewater, and nitrogen and phosphorus adsorption and electric energy collection and storage are achieved at the same time; 3, separation: separating the composite particles through a magnetic separation device, and further purifying the wastewater through a sedimentation tank; 4, regeneration: forming an electric field by utilizing the collected electric energy, desorbing particles by combining with a neutral solution of an antibiotic degradation product, and recycling after cleaning; 5, standard reaching and energy consumption balance are carried out, the wastewater is disinfected, the water quality is monitored, the stirring speed and the power supply proportion are adjusted in a linkage mode, and standard emission and energy consumption self-balance are ensured. The method does not need to depend on microorganisms, particles and energy recycling, the treatment efficiency is high, and the operation cost is low.

The invention relates to the technical field of agricultural environment information, and discloses a rice field nitrogen and phosphorus loss amount remote regulation and control method oriented to environment data. The method comprises the following steps: acquiring historical nitrogen and phosphorus loss data, real-time meteorological data and water and fertilizer operation information of the rice field; constructing a mechanism constraint sub-model fusing nitrogen migration and transformation kinetics and phosphorus adsorption and desorption balance; performing multi-source feature extraction on the meteorological data to generate a standardized environment vector; inputting the lightweight residual convolutional neural network to output an initial prediction value; on-line fine adjustment is carried out through a Lagrangian multiplier method in combination with the mechanism model, and a corrected predicted value conforming to substance conservation is generated; and when the predicted value exceeds a threshold value, generating a drainage gate opening degree and fertilization plan adjustment instruction, and issuing the instruction to an edge terminal for execution through the narrowband Internet of Things.

The invention relates to the technical field of environmental functional materials, and discloses a preparation method of composite ceramsite with good nitrogen and phosphorus adsorption performance, and the preparation method specifically comprises the following steps: 1, preparing raw materials: preparing fly ash, bentonite and corn straw according to a mass ratio of 6: 3: 1 as the raw materials; 2, pretreatment: crushing the raw materials to 100 meshes, and drying at 105 DEG C for 24 hours; 3, balling: mixing fly ash, bentonite and corn straw powder according to a ratio of 6: 3: 1, adding deionized water, and stirring to form a ball, so as to prepare a raw material ball with a diameter of 5-7mm; 4, drying: drying the raw material nodules in an environment at 105 DEG C for 24 hours; 5, preheating: preheating the corn straws in a muffle furnace at 400 DEG C for 40 minutes, and pyrolyzing the corn straws to form holes; the power plant waste fly ash, the natural mineral bentonite and the agricultural waste corn straw are reasonably utilized, so that the production cost is reduced, resource utilization of the wastes is realized, and environmental protection is facilitated.

The invention provides a method for removing phosphorus from a cobalt sulfate solution. The method comprises the following steps: providing a cobaltous sulfate solution to be treated; the method comprises the following steps: mixing a to-be-treated cobaltous sulfate solution, a composite polymer soluble ferric salt and a coagulant aid, carrying out precipitation reaction, and separating to obtain phosphorus-containing slag and cobaltous sulfate primary purified liquid; a deep phosphorus removal adsorbent is adopted to adsorb trace phosphorus in the cobalt sulfate primary purification liquid, then trace iron in the cobalt sulfate primary purification liquid generates precipitates in an oxygen-containing atmosphere, and after separation, a cobalt sulfate secondary purification liquid is obtained. According to the method, firstly, the synergistic effect of the composite polymer soluble ferric salt and the coagulant aid is adopted, and primary efficient removal of phosphorus is achieved; then, a deep phosphorus removal adsorbent is used for directionally adsorbing trace phosphorus in the cobalt sulfate primary purification liquid, so that deep removal of phosphorus is further realized; and finally, the residual trace iron is precipitated and separated in the oxygen-containing atmosphere, so that the purity of the secondary purified cobalt sulfate liquid is further guaranteed.

The present application relates to the field of dephosphorization adsorbent, disclose a kind of modified hydrotalcite adsorbent and its preparation method and application, the adsorbent includes hydrotalcite and / or hydrotalcite-like compound with lamellar structure, and modification component;The modification component includes the first metal component modified on the layer of the hydrotalcite and / or hydrotalcite-like compound, and the second metal component modified in the interlayer of the hydrotalcite and / or hydrotalcite-like compound;Wherein, the first metal component is selected from transition metal and / or rare earth metal;The second metal component is selected from at least one of alkali metal.By metal modification in the layer and interlayer of hydrotalcite and / or hydrotalcite-like compound, the selectivity of adsorbent for phosphate in water can be effectively improved, and the phosphorus capacity is high, and has excellent effect in the application of dephosphorization in complex water.

The utility model relates to the technical field of trash holding, in particular to a trash holding device capable of digesting nitrogen and phosphorus, which comprises a U-shaped base, and nitrogen and phosphorus adsorption structures capable of being replaced respectively are clamped and embedded at U-shaped openings of the U-shaped base. The nitrogen and phosphorus adsorption structure capable of being replaced respectively comprises a clamping and embedding fixing frame, a first filter screen installed on one side of the clamping and embedding fixing frame, a second filter screen installed on the other side of the clamping and embedding fixing frame and a third filter screen installed in the clamping and embedding fixing frame in a clamping and embedding mode. The first adsorption plate is installed between the first filter screen and the third filter screen, the second adsorption plate is installed between the second filter screen and the third filter screen, a hoisting machine is arranged on the U-shaped base 1, and a water blocking structure is arranged on the side face of the U-shaped base. According to the device, the nitrogen and phosphorus adsorption structures can be replaced respectively, so that an operator can directly replace the adsorption plate with saturated adsorption without blocking water flow, and the device is simple in operation of replacing the adsorption plate and high in replacement efficiency.

This invention discloses a precision treatment system and control method for farmland non-point source phosphorus pollution based on enrichment and reuse, comprising a water control unit, a purification unit, a desorption unit, and a power supply unit; the purification unit is installed inside the water control unit, and the desorption unit is connected externally to the water control unit; the water control unit is used for water flow control; the purification unit is used to purify farmland non-point source polluted water, and the purification unit includes directional phosphorus adsorption matrix filler, which is lanthanum-based coated molecular spheres and lanthanum-based coated molecular bricks; the desorption unit is used to perform desorption when the phosphorus adsorption capacity of the purification unit is saturated; the power supply unit is used to supply power to the system; thus, precision treatment of farmland non-point source phosphorus pollution based on enrichment and reuse is achieved.

The invention discloses an imaging electrode and method for representing iron ore driven phosphorus release in soil sediment. The imaging electrode comprises a conducting layer, an imaging layer and a diffusion protection layer wrapping the conducting layer and the imaging layer. The conductive layer comprises a conductive base material and a to-be-detected sample covered on the surface of the conductive base material, the to-be-detected sample contains iron ore adsorbed with phosphorus, the imaging layer is a film formed by first gel, a phosphorus adsorbent is dispersed in the first gel, and the first gel is agarose gel or cross-linked gel of polyacrylamide and agarose; and a diffusion protective layer is agarose gel. The imaging electrode can truly and effectively simulate the reduction process of iron ore in soil and sediments, accurately reflect the phosphorus reduction and release behaviors of iron ore in different thermodynamic states in a natural environment, and accurately obtain the actual critical potential of phosphorus release caused by reduction of iron ore in a sample to be detected; and the ratio of the steady-state iron ore to the metastable-state iron ore in the sample can be obtained through the obtained image.

The invention discloses a magnesium-doped calcium carbonate adsorbent and a preparation method and application thereof, the chemical formula of magnesium-doped calcium carbonate is as shown in the following formula (1): MgxCa1-x (CO3), x represents the molar ratio of magnesium to calcium, 0 lt; xlt; and 0.200%. Compared with pure calcium carbonate, the adsorption rate of the adsorbent based on the magnesium-doped calcium carbonate material provided by the invention is greatly improved, so that passivation of the pure calcium carbonate in the early stage of adsorption is relieved. Under the condition of the same phosphorus adsorption amount, the adsorption rate of the adsorbent is obviously improved. Alternatively, under the same adsorption time, the phosphorus adsorption amount of the adsorbent provided by the invention is obviously improved. The adsorbent provided by the invention has good adsorption selectivity (competitive ion interference resistance), so that the adsorbent has high practical application value. In addition, as the preparation is simple and convenient and the cost is low, the compound can be used as an agricultural fertilizer slow-release agent, can maintain the phosphorus content in farmland for a long time, and is more beneficial to the growth of crops.

The invention relates to the technical field of wastewater treatment materials, in particular to a preparation method of a nano-hydroxyapatite-based composite material, which comprises the following steps: selecting high-density polyethylene as a continuous phase matrix material and nano-hydroxyapatite as a functional filler, adding a silane coupling agent as an interface modifier, and carrying out hydrophilic modification through a hydrophilic agent to obtain the nano-hydroxyapatite-based composite material. The composite material is obtained through nano-hydroxyapatite pretreatment, melt blending, physical foaming and molding processing. The composite material is applied to an MBBR (Moving Bed Biofilm Reactor) for wastewater treatment; the compressive strength of the obtained composite material is greater than or equal to 15 MPa, and the annual wear rate lt Meanwhile, the microporous structure of the nano-hydroxyapatite provides a large number of active sites for microorganism attachment, the biological membrane quantity of the system can reach 35 g / L, the ammonia nitrogen removal rate is increased by 30-50% compared with the prior art, and the phosphorus adsorption capacity reaches 8-10 mg / g.

The invention belongs to the technical field of industrial and agricultural waste recycling, and particularly relates to a method for recycling biogas slurry nutrients by mechanically and chemically activating anaerobic biogas residue biochar. According to the method, magnesium oxide desulfurization residues and oxalic acid are used as grinding aids, and biochar is activated by using a mechanochemical technology, so that the content of water-soluble phosphorus in the biochar is increased, and the water-soluble phosphorus is used as a phosphorus source of an MAP reaction. Meanwhile, Mg < 2 + > in MDWR provides a magnesium source for MAP reaction. The particle size of the activated biochar is reduced, the specific surface area is increased, the activated biochar can be used as a seed crystal to accelerate struvite crystal formation, and the nitrogen and phosphorus adsorption performance is improved by increasing the specific surface area; and finally, synergistically recovering nitrogen and phosphorus nutrients in the biogas slurry through MAP chemical precipitation and physical adsorption of activated biochar. According to the method, the process for recycling the biogas slurry nutrients by using the mechanochemical activated charcoal is obvious in recycling effect. The problem of disposal of two wastes of biogas slurry and biogas residue in an agricultural pig farm is solved, and an innovative process is provided for resource utilization of industrial and agricultural wastes.

The invention discloses a phosphorus-loaded catalyst regeneration waste liquid recovery treatment method and a phosphorus-loaded catalyst regeneration waste liquid recovery treatment device, and aims to better control the acidity of a regeneration liquid so as to maintain the service life of a phosphorus-loaded catalyst and realize the cyclic utilization of the regeneration liquid and the reduction concentration of phosphorus resources. And the treatment difficulty of the regenerated waste liquid can also be reduced. Comprising the following steps: introducing the phosphorus-loaded catalyst regeneration waste liquid into an adsorption device filled with a regeneration waste liquid dephosphorization adsorbent, separating a phosphorus component in the phosphorus-loaded catalyst regeneration waste liquid, collecting an effluent as a phosphorus-poor regeneration liquid, and recycling the phosphorus-poor regeneration liquid for regeneration of the phosphorus-loaded catalyst, after the regeneration waste liquid dephosphorization adsorbent is saturated in adsorption, hot water is adopted as a desorption medium to replace the stored liquid in the adsorption device, the volume of the desorption medium is controlled to be smaller than the volume of the phosphorus-carrying catalyst regeneration waste liquid capable of being contained in the adsorption device, and the regeneration waste liquid dephosphorization adsorbent is eluted.

The invention discloses a nitrogen and phosphorus adsorbent and a preparation method and application thereof, and belongs to the technical field of environmental protection and resource utilization. The preparation method comprises the following steps: uniformly mixing coal gangue powder with NaOH, calcining, adding water, carrying out hydrothermal reaction with NaAlO2, washing, centrifuging, and drying to obtain CGMS; the preparation method comprises the following steps: preparing a sodium alginate solution, adding CGMS into water to obtain a CGMS solution, adding a sodium alginate solution into the CGMS solution, then adding a NiCl2 solution, and finally adding a glutaraldehyde solution to obtain a mixed solution, stirring, centrifuging, washing and drying to obtain SA-CGMS; and finally, mixing the sludge with SA-CGMS, drying, carrying out ball milling on the dried material, screening, granulating into balls, drying, and finally calcining to obtain the nitrogen and phosphorus adsorbent. The nitrogen and phosphorus adsorbent prepared by the invention has the nitrogen and phosphorus resistance and control of 90% or more, and can significantly reduce the leaching loss of nitrogen and phosphorus. And after being continuously used for 6-8 years, the nitrogen-phosphorus adsorbent is applied to the permeable control layer, so that the soil fertility of the barren farmland in the karst region can be increased, carbon sequestration can be realized, and heavy metals and antibiotic pollutants in a plough layer can be adsorbed.

The present application relates to the field of agricultural environmental information technology, and discloses a remote control method for nitrogen and phosphorus loss amount of paddy field facing environmental data. The method comprises the following steps: obtaining historical nitrogen and phosphorus loss data, real-time meteorological data and water and fertilizer operation information of the paddy field; constructing a mechanism constraint sub-model combining nitrogen migration and transformation dynamics and phosphorus adsorption and desorption balance; performing multi-source feature extraction on the meteorological data to generate a standardized environmental vector; inputting the light residual convolutional neural network to output an initial prediction value; combining the mechanism model to generate a corrected prediction value conforming to the conservation of mass through the Lagrange multiplier method; when the prediction value exceeds the threshold value, generating a drainage gate opening degree and a fertilizer plan adjustment instruction, and delivering the instruction to an edge terminal for execution through a narrowband Internet of Things.

The invention discloses a preparation method of a zirconium modified nitrogen and phosphorus adsorption material, which comprises the following steps: dissolving zirconium acetylacetonate in warm water, adding a polyvinyl alcohol resin aqueous solution, stirring, cooling to obtain a zirconium modified aqueous solution, adding a ceramsite matrix into the zirconium modified aqueous solution, dipping for several hours, filtering to obtain modified liquid ceramsite, and drying to obtain the zirconium modified nitrogen and phosphorus adsorption material. And drying the ceramsite of the modified liquid to obtain a ceramsite matrix containing organic zirconium cross-linked gel, finally heating the ceramsite matrix, preserving heat, and heating and sintering to obtain the zirconium modified nitrogen and phosphorus adsorption material with a porous structure. Water-soluble zirconium organic molecules are adopted as a modifier, washing treatment is not needed, wastewater discharge and cost are reduced, zirconium acetylacetonate and amino resin are cross-linked to generate porous zirconium dioxide, and the nitrogen and phosphorus adsorption capacity is remarkably improved.

According to the multifunctional emergency phosphorus removal aeration device for the lake, the phosphorus removal system is adopted, sewage to be treated is guided into the water inlet pipe after being preliminarily filtered, more than 90% of phosphorus can be removed from the sewage passing through the biological filter layer under the action of the phosphorus adsorption plate, and the water after phosphorus removal is guided into the system, so that the sewage can be recycled. Under the action of oxygen bubbles generated by the aeration pipe grid, microorganisms released by the bottom microorganism particle slow release tank are diffused into a large water area, so that the treatment of eutrophicated rivers and lakes is improved. The aeration system is simple in structure and convenient to use, the aeration system is not provided with a mechanical rotating part in water, the water body is not vibrated violently, organisms in the water body are not damaged, the water body is not easily stirred, deposited pollutants are not easily released into the water body again, and on the other hand, a biological filtering layer formed by microorganisms attached to the ceramsite layer is low in price, resistant to corrosion, light in weight and convenient to use. The porous surface area is large, the stress resistance is good, and the generalizability is high.

The invention discloses a La-Fe bimetal organic framework derived heterojunction material anode and a preparation method and application thereof, and belongs to the technical field of phosphorus adsorption materials. The preparation method of the La-Fe bimetal organic framework derived heterojunction material comprises the following steps: (1) mixing ferric salt, lanthanum salt, terephthalic acid and an organic solvent, and carrying out solvothermal reaction to obtain a La-Fe bimetal organic framework precursor material; and (2) carrying out calcination derivation on the La-Fe bimetal organic framework precursor material in an inert atmosphere to obtain the La-Fe bimetal organic framework derived heterojunction material. The preparation method is simple and low in cost, and the prepared La-Fe bimetal organic framework derived heterojunction material anode has the advantages of being high in adsorption capacity, high in adsorption rate, high in selectivity, wide in pH application range and the like on phosphate.

The application discloses a phosphorus-carrying catalyst regeneration waste liquid recycling treatment method and device, and aims to solve the technical problem of how to better control the acidity of the regeneration liquid to maintain the service life of the phosphorus-carrying catalyst, realize the recycling of the regeneration liquid and the concentration reduction of the phosphorus resource, and reduce the treatment difficulty of the regeneration waste liquid. The method comprises the following steps: introducing the phosphorus-carrying catalyst regeneration waste liquid into an adsorption device filled with a regeneration waste liquid phosphorus removal adsorbent, separating the phosphorus component in the phosphorus-carrying catalyst regeneration waste liquid, collecting the effluent as a phosphorus-lean regeneration liquid, recycling the phosphorus-lean regeneration liquid for the regeneration of the phosphorus-carrying catalyst, and mainly using the phosphate as the phosphorus component; when the regeneration waste liquid phosphorus removal adsorbent is saturated, hot water is used as a desorption medium to replace the liquid in the adsorption device, the volume of the desorption medium is controlled to be less than the volume of the phosphorus-carrying catalyst regeneration waste liquid that can be contained in the adsorption device, and the regeneration waste liquid phosphorus removal adsorbent is eluted.

The invention relates to the technical field of sewage treatment, and discloses an artificial wetland and a carbon source intelligent regulation and control method thereof. The constructed wetland comprises an artificial medium composite layer, a carbon source regulation and control mechanism, a water inlet mechanism and a water outlet mechanism. The artificial medium composite layer comprises a diversion layer, a reaction layer and a precipitation layer which are sequentially arranged from top to bottom, the reaction layer is provided with a mounting module, and a carbon source is arranged in the mounting module; the carbon source regulation and control mechanism comprises a carbon source storage device, an extraction device and a conveying device, one end of the conveying device is connected with the carbon source storage device, and the other end is connected with the mounting module; the water inlet mechanism is connected with the diversion layer; the water outlet mechanism is connected with the precipitation layer. A carbon source is provided for the mounting module through the carbon source regulation and control mechanism, and the carbon source is sufficient when the artificial medium composite layer treats sewage. The carbon source regulation and control mechanism can control and regulate the supply speed of the carbon source, can control the denitrification process to be efficiently carried out, inhibits the phosphorus adsorption saturation phenomenon, and is higher in nitrogen and phosphorus removal efficiency of the constructed wetland.

The invention relates to the technical field of water treatment materials and resource recovery, in particular to a chitosan-based hydrogel ball as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing an acidic aqueous solution of chitosan with soluble ferric salt to obtain an M-chitosan solution; wherein the metal salt is selected from soluble ferric salt or a mixture of soluble ferric salt and soluble calcium salt; the M-chitosan solution forms charged liquid drops by adopting electronic injection treatment, the charged liquid drops are dropped into alkaline solidification liquid, and the chitosan-based hydrogel balls are obtained after solidification treatment. The chitosan-based hydrogel ball prepared by the preparation method provided by the invention solves the bottleneck that a traditional phosphorus removal adsorbent is difficult to have efficient adsorption performance and recoverability at the same time. Besides, the chitosan-based hydrogel ball can be applied as a fertilizer after adsorbing phosphorus, so that a'pollution control-resource recovery 'closed loop is realized, and the chitosan-based hydrogel ball has the dual functions of efficient phosphorus removal and agricultural recycling.

The invention discloses an integral phosphorus removal adsorbent based on a fibrous inorganic mineral material, a preparation method of the integral phosphorus removal adsorbent and application of the integral phosphorus removal adsorbent to removal of phosphorus in an aqueous solution. According to the invention, a fibrous inorganic mineral material with the size of more than centimeter level is used as a carrier, a non-noble metal salt is used as a precursor, non-noble metal hydroxide is formed through in-situ deposition, and the non-noble metal hydroxide is uniformly attached to the surface of the fibrous inorganic mineral material, so that the integral phosphorus removal adsorbent is directly obtained without further molding. The preparation process is simple, the material source is wide, the cost is low, and large-scale preparation is easy. The obtained adsorbing material can effectively remove trace phosphorus in water, has high phosphorus removal capacity and rapid adsorption kinetics, can realize an excellent treatment effect in a wide concentration and pH range, and can be recycled.

The invention discloses an iron / calcium modified chlorella biochar material for removing phosphorus from mariculture tail water, which comprises chlorella biomass powder, a Fe source, a Ca source and polyethylene glycol 4000, and nitrogen is used as a protective gas in the preparation process. The catalyst is prepared through the steps of chlorella biomass pretreatment, Fe / Ca impregnation liquid preparation, biomass impregnation and pretreatment, anaerobic pyrolysis and the like, the porous structure and the positive electricity surface of the catalyst can strengthen phosphorus adsorption, and phosphorus is removed through the synergistic effect of electrostatic adsorption, ligand exchange, chemical precipitation and physical interception; when the pH value is 3-11 and the salinity is 5-40 per thousand, the phosphorus removal efficiency is high. When in use, the phosphorus removal rate of the tail water reaches 93% or above, the tail water tends to be saturated within 4 hours, the phosphorus concentration of the treated tail water can meet the first-grade discharge standard of 0.5 mg / L or below, meanwhile, resource utilization of the chlorella breeding waste is achieved, additional transfer treatment materials are not needed, and the operation cost and time are saved.

The present invention discloses a cerium-based metal-organic framework material containing defective sites, its preparation method, and application, and belongs to the field of phosphorus adsorption materials. The preparation method of the cerium-based metal-organic framework material containing defective sites of the present invention comprises the following steps: dissolving ammonium cerium nitrate and terephthalic acid in water and an organic solvent, respectively, and then mixing them, then mixing them with a monocarboxylic acid, and performing a solvothermal reaction to obtain the cerium-based metal-organic framework material containing defective sites. The preparation method of the present invention is simple and low-cost; the prepared cerium-based metal-organic framework material containing defective sites has the advantages of large phosphorus adsorption capacity, fast adsorption rate, high selectivity, and a wide pH range of application.

The present invention discloses a method for improving efficiency and reducing consumption by compounding phosphorus removal composite nanomaterials, which belongs to the field of water treatment technology. The method determines the volume ratio of the loading material by the ratio of organic phosphorus and orthophosphate in water, and the ratio of phosphorus adsorption of lanthanide materials and iron-based materials, and has good pertinence for different types of wastewater containing different phosphorus concentrations; the method scientifically utilizes the differences in kinetics, thermodynamics and adsorption capacity of deep phosphorus removal between lanthanide composite nanomaterials and iron-based composite nanomaterials, and adopts a compounding method to fully utilize the high adsorption capacity and La-P specific reaction of lanthanide materials, as well as the rapid adsorption kinetics and Fe-P specific reaction of iron-based materials, which can greatly improve the utilization rate of the two materials and the depth of effluent phosphorus removal, reduce the regeneration frequency and regeneration agent consumption, and achieve efficiency improvement and consumption reduction of deep phosphorus removal by adsorption.