86 results about "Struvite" patented technology

The invention belongs to the technical field of magnesium desulfurization wastewater treatment, and particularly relates to a magnesium desulfurization wastewater ammonia nitrogen and heavy metal ion cooperative treatment system which is characterized by comprising a vertical flow sedimentation tank, a stirring reaction device and a cyclone separator, and an outlet of the vertical flow sedimentation tank is connected with an inlet of the cyclone separator through a material transfer pipeline; a bottom outlet of the cyclone separator is connected with a stirring reaction device, the stirring reaction device is connected with an inlet of the vertical flow sedimentation tank through a seed crystal pump and a seed crystal pipeline, the stirring reaction device is connected with an automatic phosphate dosing feeder, the bottom of the stirring reaction device is connected with a blow-off pipeline through an automatic blow-off valve, and the treated desulfurization wastewater enters a downstream sewage treatment plant or is subjected to slag flushing. The method has the advantages that denitrification efficiency is high, reaction is stable, ammonia nitrogen and heavy metal ions in the magnesium desulfurization wastewater are synergistically removed, separated magnesium ammonium phosphate (struvite) precipitate crystals are used as seed crystals to return and adsorb, excessive addition of phosphate agents is reduced, and the effect of mixed reaction can be guaranteed.

The wastewater treatment system comprises a water inlet unit, a reactor, a separation unit and a circulation unit which are sequentially connected to form a closed-loop system, the water inlet unit is further connected with a chemical dosing unit, the water inlet unit is used for conveying wastewater to the reactor, and the chemical dosing unit is used for adding alkali into the wastewater to adjust the pH value and providing required magnesium ions; a fluidization reaction zone and a separation zone are arranged in the reactor, and the fluidization reaction zone promotes generation and growth of struvite particles through particle collision and aggregation; the separation zone enables generated particles to partially fall back to the fluidization reaction zone for continuous reaction through preliminary solid-liquid separation; the separation unit is used for receiving the wastewater in the separation area, further removing residual particles, and enabling the small particles to flow back to the reactor through the circulation unit for recycling. By optimizing the particle generation, separation and backflow processes in wastewater treatment, the formation of target large particles is promoted, the resource recycling is facilitated, meanwhile, the consumption of chemical agents is reduced, and the cost is reduced.

The invention discloses an ecological slope protection material, system and method based on struvite biomineralization technology.The ecological slope protection material comprises a slope stabilization material and a vegetation matrix, the slope stabilization material is composed of an enzyme-induced phosphate precipitation reaction solution and an enzyme-induced carbonate precipitation reaction solution, and through the synergistic effect of the two biomineralization technologies, the slope stabilization material can be used for slope protection. A biological mineralization reaction occurs in the side slope to generate struvite, magnesium carbonate and other minerals, so that side slope tailing sand reinforcement and heavy metal stabilization are realized, and slow-release nutrition is provided for plant growth. The invention further constructs a multi-layer slope protection system comprising a slope lattice beam, an in-situ remediation area, a slope drainage layer and a slope vegetation layer, and the multi-layer slope protection system is achieved through a construction method combined with a special grouting-sprinkling irrigation device. And finally, integrated safety reinforcement and ecological regreening of the side slope of the heavy metal tailings pond are achieved.

The invention provides a method for recovering nitrogen and phosphorus in wastewater through self-driven bipolar membrane electrodialysis. A system used in the method takes a magnesium negative electrode as a positive electrode and an air electrode as a positive electrode, and a self-driven primary battery is formed through wire connection; and ion exchange membranes with specific sequences are sequentially arranged between the two electrodes to form eight chambers, namely an anode chamber, a nitrogen and phosphorus recovery chamber, a wastewater chamber, a metal ion chamber, an ammonia water chamber, a hydrochloric acid chamber, a buffer chamber and a cathode chamber. During operation, an external power supply is not needed, and ion migration is driven by a self-generated electric field: after Mg < 2 + > and PO4 < 3-> are enriched in the nitrogen and phosphorus recovery chamber and NH4 < + > and Ca < 2 + > migrate to the metal ion chamber, NH4 < + > enters the ammonia water chamber through the monovalent cation exchange membrane, and Ca < 2 + > is separated out and reacts with OH <-> generated by the bipolar membrane to generate Ca (OH) 2 precipitate, so that membrane blockage is effectively prevented, and finally, NH4 < + >, Mg < 2 + > and PO4 < 3-> react to generate high-purity struvite. Zero energy consumption of nitrogen and phosphorus recovery of the wastewater is achieved, no additional chemicals exist, anti-blocking operation is achieved, and both environmental benefits and resource benefits are achieved.

The invention belongs to the technical field of solid waste recycling and wastewater treatment, and particularly relates to a method for treating chromium-containing wastewater by adopting organic amine flue gas desulfurization residues. According to the method, organic amine flue gas desulfurization residues are used as a reducing agent, phosphoric acid is used for controlling the pH value of wastewater, hexavalent chromium is reduced into trivalent chromium under the acidic condition, meanwhile, desulfurization ash is converted into a melamine phosphate flame-retardant material, and trivalent chromium is separated from water in a precipitation form under the neutral condition; after the precipitate is roasted, chromium sesquioxide powder with relatively high purity is obtained, residual ammonia nitrogen in the wastewater, the added magnesium salt and residual phosphoric acid in the water form struvite precipitate, so that the ammonia nitrogen in the water is removed, and the struvite can be used as a raw material of a slow-release fertilizer. According to the method, the treatment cost of the vanadium extraction wastewater and the flue gas desulfurization slag is remarkably reduced, valuable elements are fully recycled, and resource utilization of flue gas desulfurization waste in a waste-to-waste mode is achieved.

The utility model belongs to the technical field of industrial wastewater treatment, and particularly relates to a coking wastewater treatment system for industrial continuous production. Comprising a decomposition bin which comprises a moisture evaporation bin, an ammonia decomposition bin, a horizontal transmission belt penetrating through the moisture evaporation bin and the ammonia decomposition bin, a sedimentation tank, a filter connected to an outlet of the sedimentation tank, and a buffer bin connected to an outlet of the filter. The coking wastewater generates struvite in the sedimentation tank, redundant water is filtered out in the filter, and the struvite is stored in the surge bin and then sent to the decomposition bin. The ammonia gas enters the water evaporation bin through the horizontal conveying belt to evaporate redundant water, and then is fed into the ammonia gas decomposition bin to be thermally decomposed to release ammonia gas. The buffer bin can enable intermittent work of the filter not to affect continuous production of the system, the decomposition bin can achieve continuous evaporation dehydration and thermal decomposition processes, the wastewater treatment efficiency is improved, meanwhile, struvite decomposition products are reused in wastewater treatment, cyclic utilization of resources is achieved, and the energy consumption is reduced. The method has good economic benefits and environmental benefits.

The invention belongs to the technical field of sewage treatment, and discloses a DO-ORP coordinated regulation artificial tidal food web sludge in-situ reduction and phosphorus recovery method. Aiming at the problems of high energy consumption, serious phosphorus resource loss and the like of traditional sludge treatment, a multi-stage food chain consisting of microorganisms, protozoa and metazoan is implanted by constructing an artificial tidal environment with periodic alternation of wetting and drying; according to the method, the metabolic activity of sludge hydrolysis flora and phosphorus-accumulating bacteria is activated by utilizing cooperative regulation and control of DO concentration and ORP, microbial extracellular polymeric substances are triggered to be depolymerized by adopting tidal periodic oscillation, in-situ reduction of sludge biomass is realized by combining a food web cascade predation effect, and phosphorus is synchronously removed by virtue of an anaerobic phosphorus release-aerobic phosphorus uptake coupled struvite crystallization process. The method is suitable for treating the excess sludge of a municipal sewage treatment plant, and the high-purity magnesium ammonium phosphate fertilizer is produced while the dehydration energy consumption is reduced by 40%.

A method of recovery of ammonium phosphate comprises providing a start material (100) comprising struvite into a first aqueous process liquid (101) comprising monoammonium phosphate. The first aqueous process liquid (101) is mixed. Thereby the start material (100) comprising struvite is converted into monoammonium phosphate and / or diammonium phosphate in solution and a residue (103) comprising newberyite as a precipitate. The residue (103) is separated from the first aqueous process liquid (101), thereby giving a second aqueous process liquid (104) comprising monoammonium phosphate and / or diammonium phosphate. At least a part of said second aqueous process liquid (104) or a part of an aqueous process liquid (107, 112) emanating therefrom is returned into the first aqueous process liquid. Phosphoric acid (110) is added. A method for extracting nitrogen from reject water, an arrangement (1) for recovery of monoammonium phosphate and a system for extracting nitrogen from reject water is also disclosed.

The invention belongs to the technical field of sewage treatment, and particularly relates to a lateral flow anaerobic ammonia oxidation effluent deep nitrogen and phosphorus resource recycling method which comprises the following steps: mixing treated anaerobic sludge digestion liquid and untreated anaerobic sludge digestion liquid in an intermediate water tank to form mixed inlet water; adding a magnesium source into the mixed inlet water in the middle water tank to form a middle mixed solution; transferring the intermediate mixed solution into a short-cut denitrification-anaerobic ammonia oxidation coupled struvite reactor, adjusting the pH value of the intermediate mixed solution, and adding a carbon source into the pH-adjusted intermediate mixed solution to form a reaction solution; and carrying out solid-liquid separation on a product obtained after the reaction of the reaction liquid, and discharging the separated liquid or systematically recycling the separated liquid. According to the invention, deep nitrogen removal and phosphorus resource recovery under the condition of low carbon source can be realized, and a new way is provided for subsequent deep treatment of a short-cut nitrification-anaerobic ammonia oxidation process.

The utility model relates to a struvite dephosphorization device for anaerobic effluent, which mainly solves the technical problems of high moisture content, more impurities and the like of products of the existing dephosphorization device. The device comprises a fluidized bed reactor with a cylindrical structure, and the fluidized bed reactor sequentially comprises a collecting area, a reaction area and a settling area from bottom to top. The lower part of the reaction area is provided with a water inlet, a medicament inlet and a reflux inlet which are respectively connected with a water inlet pump, a medicament pump and a reflux pump; a reaction sleeve is arranged at the middle lower part of the reaction area; an aeration head is arranged in the reaction sleeve. And the diameter of the upper barrel of the reaction area is gradually increased and transited to the settling area. A settlement sleeve is also arranged in the settlement area. And the bottom of the sedimentation tank is connected with a reflux pump and a reflux inlet through a pipeline. A gas inlet is formed in the top of the settlement area and connected with an aeration head through a gas pipeline; the gas pipeline is connected with a flowmeter and a gas pump. The bottom of the collecting area is connected with a sludge pump through a pipeline.

The invention relates to a method for optimizing struvite production parameters based on response surface method and Minteq combined regulation and control, and belongs to the technical field of parameter optimization. The invention discloses a method for optimizing struvite production parameters based on response surface method and Minteq combined regulation and control. The method has the following advantages: (1) the pH can be regulated and controlled according to the concentration of heavy metals in wastewater, the concentration of bicarbonate maximizes the recovery rate of phosphorus, the occurrence of heavy metals in struvite products is minimized, and the yield of the struvite products is improved; optimal process parameters are provided for safe and healthy application of agricultural soil fertilization; (2) the adopted response surface method has the characteristics of simple operation, high feasibility and accurate prediction; (3) regulation and control can be performed according to the concentration and alkalinity of heavy metals contained in phosphorus-containing wastewater of pig manure wastewater, and high-quality phosphorus recovery of different types of wastewater is realized; and (4) parameter regulation and control can be carried out according to the measured wastewater with phosphorus recovery value, the dosage of sodium hydroxide is saved, and the cost is greatly saved.

The invention relates to the technical field of winery cellar bottom water treatment, in particular to a winery cellar bottom water nitrogen and phosphorus recovery system. A scraping assembly is arranged in the reaction tank and is used for conveying struvite towards one side of the sinking position; wherein a transplanting assembly is further arranged above the reaction tank, two stock bin assemblies are arranged above the transplanting assembly, and a throwing assembly for throwing chemicals in the stock bin assemblies into the reaction tank is further arranged on the transplanting assembly. After cellar bottom water enters the reaction tank, the transplanting assembly can drive the two independent stock bin assemblies; a magnesium source agent and an alkali source agent are synchronously added, and the arranged throwing assembly is combined with the transverse moving function of the transplanting assembly, so that full-coverage and uniform adding of the agents in the reaction tank can be realized, and uniform dispersion of the agents is ensured.

The present invention relates to a fertilizing composition based on renewable phosphate fertilizers by proposing a composition which includes struvite, at least two trace elements, at least one secondary element, and at least one clay.

The invention relates to the technical field of sewage treatment, and discloses an aeration fluidization struvite crystallization granulation device which comprises a bottom plate and a rotating rod, the rotating rod is rotationally arranged in the middle of the upper surface of the bottom plate, the upper end of the rotating rod is fixedly sleeved with a rotating disc, and a first motor is fixedly arranged on the lower surface of the bottom plate; and the output end of the first motor is fixedly connected with one end of a rotating rod, machining cylinders are fixedly connected to the two sides of the lower portion of the rotating disc through connecting rods, and a sewage inlet is formed in one side of the upper end of each machining cylinder. According to the aeration fluidization struvite crystallization granulation device, the design of double processing barrels is adopted, when the processing barrel on one side is subjected to material changing and cleaning, the processing barrel on the other side can be kept in a working state, the waste time of material changing and cleaning can be greatly shortened, then the processing efficiency can be improved, the inner walls of the processing barrels can be automatically cleaned, and the labor intensity of workers is reduced. Materials can be effectively prevented from hardening on the inner wall of the barrel, and manpower can be greatly saved.

A sustainable control release fertilizer and a producing method thereof are developed. The sustainable control release fertilizer comprises a natural char / struvite composite with different ratio of the natural char to struvite (0:100, 25:75, 50:50, 75:25). The natural char / struvite composites represent a phosphorus pentoxid content in a range of 16 wt% to 25 wt% which is more than a common phosphate fertilizer. Furthermore, a mole ratio of Mg2+:NH4+:PO4 3- in the sustainable control release fertilizer is 2:1:1. The sustainable control release fertilizer can enhance phosphorus uptake of at least one plant at early stage of growth due to its composition as well as the developed producing method of sustainable control release fertilizer is based on recovery of phosphorus from wastewater that has the good economic and environmental effects.

A fertilizer is provided that promotes plant growth with limited phosphate run-off. The fertilizer has reduced run-off even when compared to a phosphorus normalized application of struvite. The fertilizer is based on suspended colloidal particles in aqueous solution. The colloidal particles have a size distribution in which 95 percent of the colloidal particles are less than 60 microns and have an atomic number ratio of magnesium:nitrogen:phosphorus of 1:0-3:0.5-3. The colloidal particles are heterogeneous and include domains of only struvite, or of struvite in combination with domains of pyrophosphate species, poly phosphate species, or combinations thereof. The fertilizer composition is formulated to include additional components while still retaining colloidal suspension storage stability. The colloidal particles are produced from concentrated solutions that facilitate industrial scale production. The colloidal particles promote bioavailability through root acid phosphatases activation of insoluble phosphorus species. The colloid domain size facilitates access and soil intercalation over run-off mechanisms.

This utility model relates to the field of wastewater treatment and resource recovery technology, specifically disclosing an integrated device for anaerobic fermentation of sludge to produce biogas and recover phosphorus, including: an anaerobic fermentation unit, a phosphorus recovery unit, a sludge treatment unit, a biogas recovery unit, a dosing unit, and a PLC control device. In this integrated device, after the phosphorus-rich supernatant released from the anaerobic fermentation unit enters the sedimentation tank, the PLC control device adjusts the pH to 8.5-9.0 according to data from a pH monitor, using a sodium hydroxide dosing machine, while simultaneously adding magnesium chloride via a magnesium chloride dosing machine. 2+ , prompting PO4 3‑ NH4 + With Mg 2+ The reaction produces struvite, which is then accelerated by adding PAM through a PAM dosing machine. Finally, the struvite is collected and dried through an inclined tube, realizing the targeted recovery and resource utilization of phosphorus in sludge. This avoids eutrophication of water bodies caused by phosphorus discharge with sludge and significantly improves the utilization rate of phosphorus resources.

The invention relates to the technical field of sewage treatment, in particular to a method for recovering phosphorus resources in excess sludge concentrated clear liquid in situ, which comprises the following steps: additionally arranging a reaction sedimentation tank at the front end of a sewage treatment biological system, introducing excess sludge concentrated clear liquid and part of sewage, and monitoring the flow of the sludge clear liquid, the phosphorus concentration and the ammonia nitrogen concentration in the sewage in real time. The sewage diversion flow and the magnesium liquid adding amount are automatically adjusted, the alkaline environment is regulated and controlled to promote struvite to crystallize and precipitate, and efficient phosphorus recovery is achieved. According to the method, automatic control and chemical precipitation principles are combined, only the existing process needs to be locally modified, the operation cost is low, the occupied area is small, the phosphorus recovery rate exceeds 99%, the generated struvite can be directly used as a phosphate fertilizer, the remarkable economic value is achieved, and meanwhile stable operation of a follow-up biological treatment unit is guaranteed.

The invention belongs to the technical field of environment-friendly fire extinguishing materials, and particularly relates to fire extinguishing powder based on seed crystal induced struvite and a preparation method of the fire extinguishing powder. The method comprises the following steps: by taking nitrogen and phosphorus-rich supernate in a sewage treatment plant as a raw material, firstly removing heavy metal ions in sewage through a cation selective permeable membrane, then adjusting the pH value of the supernate and the ratio of nitrogen to phosphorus, introducing seed crystal to induce struvite (MAP) to crystallize and precipitate, and filtering and drying to obtain seed crystal induced synthesized MAP particles; a horizontal planetary ball mill is further adopted, MAP and a modifier are evenly mixed and ground, and the MAP fire extinguishing powder with the good fire extinguishing performance is prepared. The layered double hydroxide (LDH) is creatively adopted as a seed crystal inducer, the pyrolysis starting temperature of the layered double hydroxide (LDH) can be remarkably increased, meanwhile, the thermal decomposition dynamic process is optimized, and therefore the thermal stability and the fire extinguishing efficiency of the layered double hydroxide (LDH) serving as the dry powder fire extinguishing agent are greatly improved.

The application discloses a method and device for recovering phosphorus in waste water by using micro-bubble assisted struvite secondary crystallization, which comprises the following steps: firstly, primary crystallization of struvite is completed by using a static mixer to obtain struvite microcrystals, and conditions for secondary crystallization are created; and then, secondary crystallization of struvite is completed by using micro-bubbles generated by dissolved air flotation in a gas floating crystallizer, and finally, struvite crystallization products with controllable particle size and excellent sedimentation performance are obtained, and the recovery effect of phosphorus in waste water can be improved.

The application discloses a kind of kitchen garbage high ammonia high salt wastewater's advanced treatment system and processing method, belong to wastewater treatment technical field.System includes pretreatment unit, biochemical treatment unit and advanced treatment unit;Pretreatment unit includes grid pool, oil separation sedimentation tank, coagulation air floatation tank and regulating tank;Biochemical treatment unit includes anaerobic reactor, anaerobic aerobic anoxic three-section biochemical reaction tank and membrane bioreactor, biochemical reaction tank includes anaerobic section, aerobic section and anoxic section;Advanced treatment unit includes struvite precipitation reactor, ozone catalytic oxidation tower, electrodialysis desalination device and activated carbon filter tower.Struvite precipitation reactor effluent part backflow to biochemical pool anoxic section, electrodialysis concentrated water backflow to regulating tank, biochemical pool aerobic section nitrification liquid backflow to anaerobic section.The application is by anaerobic-aerobic-anoxic process internal carbon source utilization and three backflow coupling design, realize efficient denitrification and phosphorus removal under low carbon nitrogen ratio condition, improve effluent quality.

The invention relates to a method for transforming dolomite-rich waste into, selectively, dicalcium phosphate, struvite and hydroxyapatite, said method comprising the following steps: 1. Dissolving the dolomite-rich waste using phosphoric acid 2. Precipitating the dicalcium phosphate by increasing the pH 3. Eliminating the calcium by adding ammonium sulfate 4. Precipitating the struvite by increasing the pH 5. Precipitating the hydroxyapatite by increasing the pH and adding calcium

The utility model provides a kind of nitrogen phosphorus recovery device for sewage treatment, comprising: air flotation system, the sewage to be treated enters to air flotation system, the air flotation system is used to form air flotation process, remove residue in sewage;First pH adjusting pool, the sewage after the air flotation system enters the first pH adjusting pool, the first pH adjusting pool is used to adjust sewage to preset pH value.The utility model is by air flotation system and first pH adjusting pool after sewage treatment, in coagulation tank, MgCl2 is added, sewage will occur as follows Reaction Mg 2+ +NH 4+ +PO4 3‑ +6H2O→MgNH4PO4·6H2O↓, so that the struvite "ammonium magnesium phosphate crystal" is generated, then through crystallization pool, sedimentation tank is handled, struvite is separated from sewage, and the struvite separated from sedimentation tank is discharged, to achieve the purpose of recycling struvite.

The invention discloses a treatment and resource utilization method of rural cultivation sewage. According to the method, nitrogen and phosphorus nutrient substances can be obtained through resource recovery on the basis of remarkably reducing the chemical oxygen demand value, the total nitrogen value and the phosphorus phosphate value of the sewage. According to the invention, pollutant components and relative content of actual rural cultivation sewage are fully considered, and organic substances in the sewage are degraded in the anode region through the microbial electrochemical action; phosphate radicals and part of ammonium ions in sewage are deposited on a cellulose membrane in a struvite crystal form in a supersaturated state by utilizing a magnesium ion modified nano cellulose membrane, redundant NH4 < + > is directionally migrated to a cathode region under the action of an electric field and is converted into NH3, and the NH3 is absorbed by an acid solution to form a nitrogen fertilizer. The method realizes resource utilization of nitrogen and phosphorus nutrient elements while efficiently removing pollutants in the rural cultivation sewage, and provides a scientific, economic and efficient method for actual treatment of the rural cultivation sewage.

The invention relates to the technical field of wastewater treatment, in particular to a phosphorus-containing wastewater treatment system and method.The phosphorus-containing wastewater treatment system comprises a fluidized bed reactor, a separation net, a pH sensor and a pH controller, and a seed crystal bed layer for inducing struvite crystallization is arranged in the fluidized bed reactor; the fluidized bed reactor is divided into a first subarea and a second subarea which are mutually communicated by the separation net, and the surface coating prevents Hor OHdiffusion; the subarea adding device is used for respectively adding a pH regulator into the two areas; the pH sensor measures the pH in real time, and the pH controller adjusts the dosage according to a set target to form a controllable pH gradient. According to the phosphorus-containing wastewater treatment system and method, the long-term stability of the pH gradient is ensured, nucleation and growth space separation is achieved, generation of fine grains is greatly reduced from the source, and the quality of phosphorus products is improved.

The invention belongs to the technical field of subsea tunnel construction, and particularly discloses high-performance sprayed concrete for a subsea tunnel. The high-performance sprayed concrete comprises independently stored sprayed plain concrete and 150-200 parts of an activation activator, and the sprayed plain concrete comprises 400-500 parts by weight of magnesium oxide, 1-5 parts by weight of magnesium salt, 1-5 parts by weight of acrylamide, 4-5 parts by weight of a water reducing agent, 1500-1800 parts by weight of a filler and 100-150 parts by weight of water which are uniformly mixed. According to the high-performance sprayed concrete, the high fluidity is maintained based on the dispersion effect of the water reducing agent; the magnesium salt and the activation activator generate struvite particles in a weak alkaline environment, a crystal nucleus effect is provided for coagulation and hardening of magnesium oxide on the basis of good corrosion resistance, and the activation activator can accelerate hydration and coagulation of magnesium oxide; acrylamide is polymerized under the action of an initiator, so that the fluidity is lost, the setting and hardening of magnesium oxide are promoted, and the sprayability is improved. The invention further discloses a construction application method of the high-performance sprayed concrete in subsea tunnels.

The invention discloses a preparation method of a struvite slow-release fertilizer based on a sodium alginate binder, relates to the technical field of solid waste utilization, and aims to solve the problems that existing struvite powder is easy to fly and lose, nutrients are released too quickly, and a traditional granulation method is poor in bonding strength, pollutes the environment or dilutes the nutrients and the like. The method comprises the steps of raw material preparation, soft material preparation through mixing, granulation forming, washing and drying. The preparation method comprises the following steps: mixing a sodium alginate solution as a binder with struvite fine powder, carrying out extrusion granulation to form particles, and carrying out ionic cross-linking curing by using a calcium chloride solution to form a calcium alginate gel film. The prepared slow-release fertilizer particles have the advantages of being environmentally friendly, remarkable in synergistic slow-release effect, high in particle strength, mild and simple in process, low in nutrient dilution rate and the like.

The invention belongs to the technical field of environmental engineering and solid waste recycling, and particularly relates to a method for preparing a deep phosphorus extraction synergistic residue-based adsorbent applied to sewage sludge. The preparation method specifically comprises the following steps: S1, adjusting the water content of sewage sludge to 90%, carrying out first-stage hydrothermal carbonization, and after hydrothermal carbonization is finished, separating to obtain hydrothermal carbon and a water-phase product 1; s2, the hydrothermal carbon is placed in mixed acid for extraction, and after extraction is finished, separation is performed to obtain phosphorus extraction liquid and extraction residues; s3, MAP precipitation is conducted on the phosphorus leaching liquor through struvite, struvite is obtained after recycling is finished, phosphorus recycling is achieved, and meanwhile residual leaching liquor is obtained through separation; s4, carrying out two-stage hydrothermal carbonization on the extraction residues, adding a mixed liquid of the aqueous phase product 1 and the residual extraction liquid before reaction, and adjusting the solid-to-liquid ratio to be 1: 10; after the reaction is finished, separating to obtain a solid-phase product and a water-phase product 2; and S5, washing the solid-phase product, and then drying the solid-phase product to obtain the residue-based high-efficiency residue-based adsorbent.

The application relates to the technical field of water treatment and resource recovery, and discloses a water body phosphorus recovery method based on a biochar mineral composite material coupling and strengthening, which comprises the following steps: simultaneously adding a polyhydroxy carboxylic acid salt and a soluble borate into wastewater containing phosphate and ammonium ions, adjusting an initial pH to 8.0-8.5; raising the mixed solution to 35-45 DEG C and keeping constant as an incubation period, adding biochar particles loaded with magnesium oxide and maintaining stirring; after the incubation period, lowering the temperature to 10-20 DEG C at a rate of 0.1-0.5 DEG C / min, continuing to maintain stirring and aging; after the aging is completed, discharging the slurry for solid-liquid separation, collecting the filter cake, and obtaining biochar composite particles rich in struvite. The technical scheme that the polyhydroxy carboxylic acid salt and the soluble borate are simultaneously added into the phosphorus-containing wastewater achieves the technical effects of inhibiting initial precipitation at the solid-liquid interface and strengthening internal pore mass transfer.

The present application relates to a kind of for beryllium and thallium pollution in lithium residue-based artificial soil Control method, the control method is to carry out hierarchical repair to lithium residue-based artificial soil, including the following steps: using first composite passivation agent, second composite passivation agent and third composite passivation agent are respectively applied to the ecological function layer, buffer control layer and solidification sequestration layer of lithium residue-based artificial soil, repair is carried out;Wherein, first composite passivation agent includes modified biochar matrix, struvite, humus and microbial inoculant;Second composite passivation agent includes modified biochar matrix and alkaline buffer material;Third composite passivation agent includes modified biochar matrix and strong alkaline solidification material.The present application designs different, multi-level passivation scheme according to the function of each soil layer of artificial soil, realizes accurate repair, to systematically solve the potential risk problem of beryllium, thallium pollution metal vertical migration in lithium residue-based artificial soil, guarantee the safe use of artificial soil.