307 results about "Phosphorus adsorption" patented technology

The invention provides a method for preparing efficient phosphorus removal biochar by shellfish waste. The method includes: (1), washing and drying shrimp and crab shells for standby application; (2), putting products obtained in the step (1) in a muffle furnace, and pyrolyzing the products at the high temperature of 300-900 DEG C under the nitrogen condition or oxygen limiting condition for 0.5-3 hours to obtain the biobar. The shrimp and crab shells include at least one of crab shells, shrimp shells or lobster shells. The obtained biochar has excellent phosphorus adsorption effect, and adsorbing capacity of the biochar to the phosphorus can reach 180mg/g; the obtained biochar also has excellent heavy metal removal capability; modification of the obtained biochar is not needed, preparation process is simple, raw materials are easy to obtain and cheap, and the biochar has quite broad market application prospect.

The invention discloses a method for preparing biological carbon with high nitrogen-phosphorus adsorption properties. According to the method, forestry and agricultural residues are taken as raw materials to prepare the biological carbon with the high nitrogen-phosphorus adsorption property by carrying out high-temperature oxygen-deficient themolysis by utilizing the catalytic performance of light rare earth elements. The sources of the utilized raw materials are wide, the cost of a rare earth catalyst is low, and the prepared biological carbon is high in nitrogen-phosphorus adsorption speed and large in nitrogen-phosphorus adsorption capacity; the largest adsorbing capacities of NO3<->, NH4<+> and PO4<3-> can respectively reach 38.44mg/g, 15.58mg/g and 19.74mg/g. The method is simple in process operation, low in investment requirement and cost and high in product recovery rate and application value.

The invention belongs to the field of sewage ecological treatment, and the purpose is to provide a device and a method for sewage decentralized treatment in circulating vertical flow constructed wetlands. The invention comprises the following aspects: 1) the high-efficient circulating vertical flow constructed wetland system comprises three main components of a vertical flow constructed wetland, a circulating water tank, and a reinforced adsorption column; 2) the operation modes comprise an intermittent mode and a continuous mode. Fillers of the constructed wetland are proportional compositions of several fillers which are low in price and high in adsorption capacities for nitrogen and phosphorus; plants which have strong durability against pollution and have landscape value (thalia dealbata or day lily) or economic value (hybrid pennisetum) are planted on the wetland surface. The invention adopts the high-efficient filler composition to reinforce nitrogen and phosphorus adsorption; effluent backflow increases the dissolved oxygen inside the vertical flow constructed wetland, and enhances the nitration capability of microbes in the wetland; the denitrification capability is enhanced; the contact time of sewage and the fillers is increased; and the removal of phosphorus is enhanced. Series-parallel combinations can be selected flexibly with respect to different sewage types, and the applicability is strong.

The invention discloses a nitrate slow-release material and a preparation method thereof. The nitrate slow-release material is prepared from the following raw materials, by mass, 45.5-62.5% of cement, 23.7-33.2% of water, 4.3-15.8% of a nitrate and 0-15% of clay mineral powder. The preparation method comprises the following steps: dissolving the nitrate into the water to obtain a nitrate solution; uniformly mixing the cement and the clay mineral powder to obtain a mixture; adding the resulting mixture to the nitrate solution, followed by carrying out concrete curing; crushing the cured material into the particles having a particle size of 3-10 mm to obtain the nitrate slow-release material. The nitrate slow-release material provided by the present invention has characteristics of slow releasing process, good slow-release effect, and easy adding way. In addition, the small amount of the nitrate slow-release material is added to the water body during using, the effect of the nitrate slow-release material can be generated for a long time after the nitrate slow-release material enters the sediment, the released nitrate from the nitrate slow-release material can be adopted as the bacterial to oxidize the electron acceptor of the organic contaminant, raise the oxidation-reduction potential of the sediment, inhibit releasing of sulfur and phosphorus, and has phosphorus adsorption effect so as to reduce the amount of the phosphorus released by the sediment. The nitrate slow-release material can be used in treating contaminated sediment in the river on a large scale.

The invention discloses an artificial wetland system taking oyster shell-waste brick-zeolite as composite filler. The invention relates to a sewage treatment device, and discloses an artificial wetland ecological treatment device applicable to the treatment of various sewages such as domestic wastewater, livestock and poultry breeding wastewater and landfill leachate. The system disclosed by the invention comprises a vertical undercurrent artificial wetland device and wetland filler, wherein the wetland filler is implemented in a large particle size grading difference 'obverse and reverse particle size mixing' filling mode and taking oyster shell, waste bricks and zeolite which are large in specific surface area, good in nitrogen and phosphorus adsorption capacity and high in volume of organism holding, so that the sustainable, efficient and stable operation of an artificial wetland ecosystem is ensured. The artificial wetland system disclosed by the invention has the advantages of low cost, low energy consumption, high nitrogen and phosphorus removal efficiency, small land-occupied area, simple structure, convenient operation management and the like, is not easy to jam, and can be combined with ecological construction and urban greening functions.

The invention discloses a method for preparing composite dephosphorus adsorbent by virtue of activated carbon fiber loaded with metal. Carbon fiber is used as a matrix which is loaded with a metallic compound. The method comprises the following steps of: a, mixing lanthanum ions into an iron salt for preparing a mixture solution of iron ions and lanthanum ions; b, putting the prepared solution under an ultrasound environment, additionally adding a radiation method, gradually adding a hydroxide solution into a metallic ion mixture solution until the pH reaches 9-10, and obtaining nano-particle suspension liquid of iron and lanthanum composite metal hydroxide; c, shearing activated carbon fiber into pieces, washing, dipping, filtering and drying; d, weighing the activated carbon fiber, adding the activated carbon fiber into the suspension liquid, processing by utilizing ultrasound waves, taking out solid matters, and washing for multiple times until the pH reaches 7; and e, drying the solid matters, obtaining an adsorbent material after cooling, and sealing the adsorbent material for storage. According to the invention, the iron and lanthanum composite metal hydroxide is in uniform particle size distribution on the carbon fiber matrix, has a high adsorption capacity and a low preparation cost and is suitable for industrial application.

The present invention is characterized by that in same reaction pool the aerobic, anoxic and anaerobic three environments can be implemented to fully remove nitrogen and phosphorus pollutants. The air blower and dump pump are synchronously started, its aerobic stage can implement degradation of organic material, amino nitrogen nitration and excess phosphorus adsorption, the time relay can be used for controlling air blower and dump pump to make them stop operation, at the same time the lifting pump and stirring machine are started, said lifting pump can intake water in large flow rate to provide full carbon source for denitrification, and a level controller is used to control its stop.

The invention relates to a short-range nitrification-denitrification dephosphorization and denitrogenation method for reinforced low-carbon/phosphorus-ratio sewage, belonging to a wastewater treatment method. The method comprises the following steps: adding sewage to be treated into a reactor, and carrying out anaerobic phosphorus-release and carbon source absorption reaction with microbes which are grown on the bottom in a suspended mode; after the anaerobic phosphorus-release finishes, refluxing the upper mixed solution to a lower suspension growth region, and elevating the ammonia-nitrogen-enriched mixed solution subjected to anaerobic phosphorus-release to an upper attached growth region; aerating the microbes in the attached growth region to enable short-range nitrification of aerobic nitrobacteria; after the aerobic nitrification finishes, circulating the upper nitrification solution to a lower suspension sludge region to carry out anoxic denitrification phosphorus-adsorption reaction; and after the anoxic denitrification phosphorus-adsorption reaction finishes, discharging a certain amount of phosphorus-enriched sludge by an emptying valve/sludge valve. The invention solves the contradiction between the competition of nitrite bacteria and polyphosphate accumulating bacteria for the sludge age and the competition of polyphosphate accumulating bacteria and denitrifying bacteria for the carbon source, has stable and efficient short-range nitrification-denitrification dephosphorization efficacy, saves the aeration and carbon source, and is suitable for denitrogenation and dephosphorization treatment of low-C/P-ratio sewage.

The invention discloses a composite metal oxide phosphorous removal adsorbent and a preparation method thereof. The composite metal oxide phosphorous removal adsorbent comprises main materials and an auxiliary material. The main materials comprise, by weight, 35-50% of alumina, 25-35% of iron oxide and 25-35% of calcium oxide. The auxiliary material comprises bentonite as a binder and the weight of the auxiliary material is 3-5% that of the main materials. The preparation method comprises raw material pre-treatment, blank molding, blank drying, presintering treatment, roasting treatment and cooling. The composite metal oxide phosphorous removal adsorbent has excellent physical and chemical properties and a high phosphorous removal adsorption capability and solves the problem of use of a single metal oxide. The composite metal oxide phosphorous removal adsorbent reduces sewage factory product water phosphorous content, satisfies upgrading and reconstruction purposes, realizes first-level A discharge standard and has a good development prospect and a practical meaning.

A high-activity red mud adsorbent used for treating the P contained sewage is prepared from the red mud rejected in preparing alumina through proportionally mixing it with acid solution, heating by water bath while reacting to generate solid product, water washing, filtering and baking. It has high adsorptive volume.

The invention provides a preparation method of a phosphorus adsorption composite material, which comprises the following steps: stripping ZnAl layered bimetal hydroxide in a stripping solvent to obtain a stripped ZnAl layered bimetal hydroxide colloid solution; and adding a macromolecular solution into the colloid solution to compound the macromolecules and the stripped ZnAl layered bimetal hydroxide into a phosphorus adsorption composite material under static action or grafting action, wherein the macromolecules are one or more of sulfonic polymers, iodopolymers, chloro-benzyl polymers and cellulose derivatives. By stripping the ZnAl layered bimetal hydroxide and then compounding the stripped ZnAl layered bimetal hydroxide and the macromolecules into the phosphorus adsorption composite material, the specific area of the stripped ZnAl layered bimetal hydroxide is increased, thereby improving the phosphorus adsorption efficiency.

The invention discloses a preparation method of a lanthanum-loaded magnetic hydrothermal biochar adsorbent and an application of the lanthanum-loaded magnetic hydrothermal biochar adsorbent in selective phosphorus adsorption. The preparation method comprises the following steps of fully reacting ground and cleaned straws serving as a carbon source and deionized water serving as a solvent in a hydrothermal kettle at a certain temperature to obtain hydrothermal biochar HTC; dissolving the HTC, ferric trichloride, ferrous chloride and lanthanum chloride in water; adding an alkaline precipitator;conducting fully stirring and transferring the solution to the hydrothermal kettle; treating the solution for a certain time at a certain temperature; and conducting washing and drying to obtain the lanthanum-loaded magnetic hydrothermal biochar. The novel adsorbent of the invention can effectively remove phosphate radicals in water, has excellent adsorption performance on the phosphate radicals,which can reach 100.25 mg P/g, shows good high selectivity, superparamagnetism and stability, and provides an environment-friendly hydrothermal biochar-based material with excellent adsorption performance for adsorbing and purifying phosphorus-containing wastewater.

The invention discloses zero-valent iron ceramsite and a preparation method thereof. The zero-valent iron ceramsite is prepared from the following raw materials in parts by weight: 40-80 parts of construction waste, 10-30 parts of smashed crop straw and 10-30 parts of iron oxide through the three steps of preparation of ceramsite blank, drying and sintering of the blank and reduction of sintered products. The zero-valent iron ceramsite prepared through the preparation method provided by the invention is loose and porous in internal structure, large in specific area, moderate in intensity, low in density, high in stability, renewable and recyclable, can remove various poisonous and harmful water pollutants simultaneously, has a high nitrogen and phosphorus adsorption and removal ratio, is good in treatment effect, simple in preparation process and high in actual operability, few kinds of raw materials are required, sources are wide and the cost is economical and low.

The invention provides a method for covering iron plaques on root surfaces of a water planting root system of wetland plants. The method comprises the following steps of (S1) preparation of iron plaque inducting liquid: performing anaerobic acidification on anaerobic hydrolysis acidification liquid until the pH (potential of hydrogen) value of the anaerobic hydrolysis acidification liquid is equal to 5 and the oxidation reduction potential of the anaerobic hydrolysis acidification liquid is 450-500, and adding ferrous ions with 100-140mg/L in the anaerobic hydrolysis acidification liquid to form the iron plaque inducting liquid; (S2) tissue culture: placing the root system of the plants in complete culture solution and culturing the root system of the plants for 4-7 days; and (S3) replacing the complete culture solution by using the iron plaque inducting liquid, and culturing the root system of the plants for 5-10 days so as to obtain the plants of which the root surfaces of the root system are coated with the iron plaques. The iron plaques with high phosphorus adsorption capacity can be adhered to the root system of the plants cultured by using the method; and the removal rate of phosphorous in sewage can be increased.

The invention belongs to the field of water treatment, and particularly relates to a method for activating water supply plant sludge-base haydite to enhance phosphorus adsorption effect. The method comprises the following steps: drying and crushing water supply plant sludge, uniformly mixing the sludge with clay, granulating in a granulator while spraying a proper amount of water, drying, carrying out high-temperature calcination to obtain haydite, soaking the haydite in hydrochloric acid for activation, cleaning and drying to obtain the activated sludge haydite. The activated sludge haydite has favorable phosphorus removal properties, and can be used as an adsorbing material for treating phosphorus-containing wastewater. The method solves the problem in water supply plant sludge treatment, saves the energy consumption for haydite production, and has favorable environmental and economic benefits.

The invention provides porous phosphorus removal ceramisites and a preparation method thereof. The ceramisites are prepared from the following raw materials in parts by weight: 55-85 parts of attapulgite, 10-30 parts of crop straws and 10-20 parts of lanthanum carbonate. The raw materials are subjected to the steps of blending, preparing a blank, sintering and cooling to prepare the porous phosphorus removal ceramisites. The ceramisites provided by the invention are simple in preparation process and high in adsorption rate, the cylinder pressure strength meets cylinder requirements on high-strength lightweight aggregates in national standards, the phosphorus adsorption capacity of the ceramisites in a wide pH value range of 1-12 is high, and the maximum phosphorus removal rate can reach 98.6%. Because the ceramisites have strong acid and alkali resistance, after adsorbing phosphorus and being eluted by a sodium hydroxide solution, the porous phosphorus removal ceramisites not only can realize recovery of adsorbed phosphorus but also can be obtained again, and are convenient to recycle, so that resources can be effectively saved. The ceramisites can be widely applied to the field of practical engineering to achieve an aim of treatment of wastes with processes of wastes against one another.

The invention provides a device for filtering sewage step by step. The device mainly comprises a biofilter, a nano aerated coagulation-micro-vortex flocculation device, a three-level backflushing and screening device, a nitrogen adsorption tank, a phosphorus adsorption tank and a photocatalytic degradation reaction device. The invention also discloses a method for treating sewage by utilizing the device. The device and the method have the beneficial effects that the pollutants difficult to degrade, such as residual polycyclic aromatic hydrocarbon compounds and residual heterocyclic compounds are degraded through deep oxidation and are sterilized, thus reducing the chroma of the effluent by more than 99%; the aromatic fulvic acid substances in the sewage treated by the device are reduced by more than 95%; the sewage turbidity is reduced by 99%; the effluent quality and transparency are high; the effluent quality is improved; The method is efficient and safe and is simple to operate; the treated sewage can be recycled for irrigating, flushing the toilets and washing the ground as recycled water.

The invention belongs to the technical fields of adsorbent material preparation and wastewater purification, and relates to a preparation method and application of a phosphorus adsorbent. The preparation method comprises the following steps: dissolving a magnesium salt and a zirconium salt in water to obtain a magnesium/zirconium solution, adding natural zeolite, reacting for some time, regulating the pH value of the solution to alkalinity, continuing reacting to obtain a precipitate, cleaning with deionized water until the supernate is neutral, and drying to obtain the magnesium/zirconium-modified modified zeolite. The preparation cost of the phosphorus adsorbent is lowered on the premise of basically not influencing the phosphorus removal effect. In a soluble-calcium-ion-added solution, the phosphorus adsorbent can efficiently remove phosphates in water.

The invention discloses a sewage nitrogen and phosphorus removal method and device. The device comprises a water inlet tank (1), an anaerobic membrane bioreactor (2), an adsorption tank, a gas separation membrane device (11) and an ammonia nitrogen absorption tank (13) which are connected in sequence, wherein sewage enters the anaerobic membrane bioreactor (2) from the water inlet tank (1) for anaerobic hydration; a vacuum membrane pump (14) and a membrane surface washing device (19) conduct membrane surface washing on the anaerobic membrane bioreactor (2); the sewage after hydration enters the adsorption tank for adsorption phosphorus removal; the sewage after adsorption phosphorus removal and alkalinity medical liquid react; the sewage is separated into purified water and ammonia gas after the sewage enters the gas separation membrane device (11); the ammonia gas enters the ammonia nitrogen absorption cell (13) after the ammonia gas reacts with acidity medical liquid; purified water flows out from a water outlet. According to the invention, 99% of ammonia nitrogen (NH3-N) is removed and recovered; 98% of phosphorus (P) is removed and recovered; water outlet effect is good; new energy is provided; energy consumption is reduced.

The invention discloses a preparation method of dephosphorisation absorptive material, comprising the following steps: washing manganese ore tailing with clean water, grinding to powder and meshing, adding acid fluid to the meshed manganese ore powder, filtering the solution, taking the solution and adding proper amount of alkali to neutralize till the pH is 6 to 8, adding oxidant solution to the filtrate while agitating, controlling the pH to be 6 to 8 during the reaction process, thoroughly shaking, ageing, neutralizing, washing, filtering and drying to obtain the product. The preparation of dephosphorisation absorptive material using natural manganese ore tailing as raw material has simple process and low cost, and has thye effect of changing wastes into valuables. The absorptive agent can remove the phosphorous well, and the saturated absorption quantity is 12.5mg/g. The absorptive agent has fast absorptive speed, large absorptive volume and good purification effect.

The invention discloses a preparation method and applications of a magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent. The method comprises: 1, synthesizing a lanthanum/iron composite metal organic framework precursor; 2, carrying out primary calcination; and 3, carrying out secondary calcination. According to the invention, the prepared magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent is a red brown powder solid in appearance, the microstructure is an obvious rod-shaped and amorphous mixed structure, the surface of the adsorbent is rough and porous,and the adsorbent integrates strong adsorption capacity of a nanometer material and good magnetic separation capacity of a magnetic material; the prepared magnetic recyclable lanthanum oxycarbonate phosphorus-removal adsorbent can remove medium-high concentration phosphorus from industrial wastewater, domestic sewage and the like and medium-low concentration phosphorus from surface water, secondary sedimentation tank effluent and the like; and the preparation method has characteristics of simple preparation process, good reproducibility, short preparation period and the like, and has good application prospect.

The invention provides a preparation method of source phosphorus adsorption material in water. The preparation method includes the following steps that dredged sediment in the water is dried for 2-4 hours at the temperature of 110 DEG C after being filtered with an iron mesh with the hole diameter being 1-2 mm, then ground and sieved with a 100-mesh sieve, and processed dredged sediment in the water is obtained; sludge in a water treatment plant is dried for 2-4 hours at the temperature of 110 DEG C after being filtered with an iron mesh with the hole diameter being 1-2 mm, then ground and sieved with a 100-mesh sieve, and processed sludge in the water treatment plant is obtained; the processed dredged sediment in the water and the processed sludge in the water treatment plant are mixed to be uniform with a stirrer, a mixed material is obtained, the weight ratio of the processed dredged sediment in the water to the processed sludge in the water treatment plant is (2-3):1, the stirring speed of the stirrer is 100 RPM, and the stirring time is 10 min; the mixed material is burnt for 2-4 hours at the temperature of 550 DEG C, and the source phosphorus adsorption material in water can be obtained. The adsorption material prepared through the method is high in adsorption capacity of phosphorus and large in adsorption volume.

The invention discloses a magnetic/non-magnetic lanthanum carbonate sodium dephosphorization adsorbent and a synthetic method thereof. The synthetic method comprises the following steps: adding lanthanum salt and ferric salt to a solvent according to a certain proportion, after ultrasonic dissolution, adding a certain amount of a chelating agent, a dispersing agent and a precipitant, after acutelyand uniformly stirring, enabling mixed solution to be sealed in a stainless steel reaction kettle lined with tetrafluoroethylene; placing the reaction kettle in an oven for reacting, after ending a reaction, cooling to a room temperature; and after performing solid-liquid separation on a product, washing for several times by pure water and ethyl alcohol, after drying in vacuum, to obtain the adsorbent. The prepared magnetic/non-magnetic lanthanum carbonate sodium dephosphorization adsorbent is complete in crystal structure, smaller in size, and uniform in particle size distribution. In addition, experiment conditions are simple, operation is easy without a special equipment requirement, and repeatability is good.