39 results about "Magnesium ammonium phosphate crystals" patented technology

The invention discloses a livestock breeding wastewater nutrient pollution control and recycling process, which mainly comprises the following steps of: making livestock breeding wastewater (1) subjected to anaerobic treatment pass through a front adjusting tank (2), respectively injecting into a sequencing batch MAP (3) or continuous-flow MAP reactor (4), blowing off soluble CO2 through exposureto improve the pH of the wastewater, and trapping and recycling magnesium ammonium phosphate crystals generated by combining PO43- with NH4+ and Mg2+ in the wastewater by using a trap (10); making the wastewater pass through a middle adjusting tank (5) and enter an MBBR reactor (6) to remove COD and NH4+-N; and settling the effluent in a sedimentation tank (7) and discharging. In the process, theMAP technology and MBBR technology are combined, phosphorus is removed and recycled by a physicochemical method, and the COD and the NH4+-N are removed by a biomembrane method so as to realize the standard drainage of the wastewater and recycle nutrient elements such as N, P and Mg. The process is simple and convenient to operate and is stable to run.

The invention discloses a wastewater nitrogen and phosphorus removing method based on magnesite, and belongs to the field of wastewater treatment. The wastewater nitrogen and phosphorus removing method comprises the following steps: (1) crushing magnesite, sieving the magnesite powder, and carrying out high-temperature calcination, so as to obtain a calcined product; (2) adjusting the initial pH value of wastewater, adding the calcined product obtained in the step (1) into the adjusted wastewater, adjusting the molar ratio of the calcined product to ammonia nitrogen or phosphate in the wastewater added with the calcined product, and stirring for a preset time; (3) adding sodium dihydrogen phosphate or ammonia chloride into the mixed product, so as to obtain magnesium ammonium phosphate crystals. The wastewater nitrogen and phosphorus removing method has the advantages that as the calcined product of magnesite is taken as a magnesium source, the adding method of ammoniomagnesium phosphate crystal medicament is replaced, the problem of relatively high medicament cost of the conventional ammoniomagnesium phosphate crystal method is solved, while the nitrogen and phosphorus removing efficiencies are improved; the recycled solid magnesium ammonium phosphate can be used for preparation of controlled-release fertilizers or cyclic utilization.

The invention belongs to the field of sludge and sewage treatment in environmental engineering, and particularly relates to a phosphorus recovery device for excess sludge. The device comprises a nitrogen-phosphorus recovering device and a sludge anaerobic reactor which is connected with the nitrogen-phosphorus recovering device, wherein the sludge anaerobic reactor is provided with a sludge standing reactor which is used for releasing phosphorus in the excess sludge by adopting the anaerobic reaction method; and a struvite nitrogen-phosphorus recovering device is used for receiving phosphorus elements in the excess sludge through a magnesium ammonium phosphate crystal (struvite). The recovery device is simple to operate, remarkable in phosphorus releasing effect, stable to run, and relatively low in cost.

The invention provides a method for treating wastewater containing nitrogen and phosphorus and synthesizing magnesium ammonium phosphate. The method comprises the following steps: adding seed crystalsinto a fluidized bed, and controlling the wastewater flow rate to enable the seed crystals to be fluidized; adjusting the pH value in the fluidized bed to an alkaline condition; adding magnesium liquid, starting reflux water, increasing the water temperature, and continuously introducing wastewater to enable the wastewater and the magnesium liquid to continuously react in the fluidized bed; reducing the water temperature, inserting the ultrasonic vibrating rod into the fluidized bed, turning on an ultrasonic vibrating rod, carrying out ultrasonic reaction, increasing the flow rate of backflowwater, turning off the ultrasonic vibrating rod, and carry out the reaction continuously; and after the reaction is finished, discharging the treated wastewater and the generated magnesium ammonium phosphate crystal precipitate. The crystal generated by the method is more regular in shape, short in reaction time and high in nitrogen and phosphorus removal rate, and the generated magnesium ammonium phosphate crystal is uniform and regular in particle size.

The invention relates to a method for recovering nitrogen and phosphorus from biogas slurry from pig farms. The method comprises the following steps of: adding a certain amount of magnesium ammonium phosphate crystal into papermaking white clay to modify the papermaking white clay; adding the modified papermaking white clay into biogas slurry in which neutralization and chemical precipitation reaction are carried out; and thus, removing the nitrogen and phosphorus from the biogas slurry in form of precipitate. The method can reduce treatment cost. The precipitate contains rich organic matters and nutrients needed by plants for growth such as nitrogen and phosphorus, and can be used to make organic compound fertilizers for promoting the growth of the plants. The method changes waste into valuable materials.

The invention discloses a treatment and recovery process for alkaline etching wastewater. The treatment and recovery process sequentially comprises the steps of copper recovery and tail liquid reutilization. The step of recovery of copper comprises the following sub-steps: pumping the alkaline etching wastewater into a reduction recovery tank until inflow wastewater reaches a preset full liquid line of the reduction recovery tank, adding sodium hydroxide to adjust the pH value of the reduction recovery tank to 11-12, adding glucose into the reduction recovery tank, and carrying out pre-reduction for 10-30 minutes; and performing standing, precipitating and solid-liquid separation successively to obtain a tail liquid with a small suspended solid concentration, discharging the tail liquid, washing a precipitate with water, and carrying out drying to obtain elemental copper. The treatment and recovery process for the alkaline etching wastewater is simple, realizes zero emission of sewage,recovers copper and magnesium ammonium phosphate crystals, achieves high recovery rate, and has extremely high economic benefits and environmental benefits; the treated alkaline etching wastewater isclear in water quality; and the treatment and recovery process has good application prospects.

The invention discloses a flue gas desulfurization method and system based on an ammonia-magnesium combined reinforced phosphoric ore pulp method. The method comprises the following steps: S1, ammoniawater and magnesium oxide are added into phosphoric ore pulp to prepare mixed slurry; S2, flue gas containing SO2 and the sprayed mixed slurry are subjected to a contact reaction to remove SO2 in theflue gas; and S3, the flue gas is discharged after being washed by the slurry, oxygen is introduced into the reacted mixed slurry for reaction, then the mixed slurry is sent back to the step S2 to continue to wash the flue gas, and when the solubility of magnesium ammonium phosphate in the mixed slurry meets a preset requirement, the mixed slurry is sent to a crystallizer to produce magnesium ammonium phosphate crystals. According to the invention, the high desulfurization capacity of ammonia, magnesium and phosphoric ore pulp is utilized, and the advantages of sulfur dioxide absorption capacity of the ammonia, the magnesium and the phosphoric ore pulp and process optimization are combined, so as to promote the sulfuric acid leaching reaction of phosphate ore and enhance the desulfurization effect of the phosphoric ore pulp; and before burdening, organic acid is added when the mixture is ground to be fine, through the mechanochemical activation effect, the coordination complexation effect with calcium can be enhanced, crystal lattices are destroyed, and sulfur dioxide removal is accelerated.

The invention relates to a device and a method for recycling nitrogen and phosphorus from waste water of a digestion tank, and belongs to the technical field of waste water disposal. An integrated device consists of an overflow pond, a pretreatment pond, a multifunctional inspection well and a crystalizing reaction pond. The method includes steps that sewage enters a digestion tank processing system through a discharge pipe, wherein the sewage firstly enters the pretreatment pond through a grid, and sludge is sunken, gas generated from reaction and fermentation is discharged or recycled from the gas outlet, and liquid supernatant of sewage reaches the lowest water line of the water outlet and enters the crystalizing reaction pond through the pipeline. Sewage entered the crystalizing reaction pond enters the crystalizing reaction pond firstly through interception of a light filter layer and the degrading function of attached microorganisms, magnesium chloride and alkaline solution are added as assistance, thus sewage overflow forms magnesium ammonium phosphate crystal greatly and then recycled; the treated sewage is flowed to a municipal sewage pipe network. If water amount is suddenly increased or the pretreatment pond has sudden fault, sewage directly enters the overflow pond and flows into the municipal sewage pipe network. The sewerage treatment ability of the digestion tank is strong, nitrogen and phosphorus nutrients can be recycled; besides, sewage treatment and resource utilization of sewage and sludge at the same time can be realized; thus the nitrogen and phosphorus load of sewage plant can be effectively reduced; the novel resource processing technology can meet the sustainable development requirement.

The invention provides a urine sewage nitrogen and phosphorus recovery and purification treatment device and method, and belongs to the technical field of sewage treatment, the urine sewage nitrogen and phosphorus recovery and purification treatment device comprises a hydrolysis tank for collecting urine, the hydrolysis tank is communicated with a reduced pressure distillation tower, the reduced pressure distillation tower is communicated with a dissolving tank and a sedimentation tank, the dissolving tank is communicated with a vacuum pump, and the sedimentation tank is communicated with an MBR reactor. The hydrolysis pool is used for collecting, storing and hydrolyzing urine resources; the reduced pressure distillation tower is used for realizing separation of nitrogen resources in the hydrolyzed urine, and recycling of nitrogen and phosphorus resources is completed by connecting the sedimentation tank and the dissolving tank; and the MBR is used for removing residual nitrogen and organic matters after the urine resources are recycled. According to the invention, the nitrogen load of a downstream sewage treatment plant is reduced, the carbon-nitrogen ratio is increased, and the treatment cost is saved; rapid and efficient ammonia separation is realized, and efficient recovery of ammonia gas is realized by virtue of a sulfuric acid solution; the heat loss is reduced, and the energy consumption is reduced; the recovered ammonium sulfate crystal and magnesium ammonium phosphate crystal have the advantages of few impurities, single component and higher purity.

The invention discloses a resource recycling municipal sewage treatment device and process and belongs to the technical field of municipal sewage treatment. The resource recycling municipal sewage treatment device comprises a grating, a collecting tank, a lift pump, a primary settling tank, a secondary settling tank, a pyrolysis tank, a water ejector, a circulating pump, an ammonia tank and the like. The process specifically comprises enabling sewage to flow through the grating for suspended solid pretreatment and then into the collecting tank for being lifted into the primary settling tank bythe lift pump for flocculation and absorption reaction, and then overflowing the reacted sewage into the secondary settling tank; feeding disodium hydrogen phosphate and magnesium chloride to form magnesium ammonium phosphate crystal for settlement, then conveying magnesium ammonium phosphate slurry into the pyrolysis tank, feeding sodium hydroxide to regulate pH to 11, and controlling the temperature to be 85-95 DEG C; by means of the circulating pump, enabling the water ejector to produce negative pressure to absorb ammonia gas, and through a magnesium sodium phosphate pump, lifting magnesium sodium phosphate solution produced in the pyrolysis tank into the second settling pond for recycling. The resource recycling municipal sewage treatment device and process can recycle resources to produce biomass fuel raw materials and ammonia, and through circulation of agent, reduce the application amount of agent.

The invention discloses a pipeline scale removal device. The pipeline scale removal device is installed on a first pipeline. A first hand valve is arranged in a first inlet, and a second hand valve isarranged in a first outlet. The pipeline scale removal device comprises a second pipeline. The second pipeline comprises a second outlet, a second inlet, a third hand valve, a first water pump, a cleaning fluid buffering tank and a fourth hand valve. The second outlet communicates with the first pipeline and is located behind the first hand valve. The second inlet communicates with the first pipeline and is located in front of the second hand valve. An outlet of the third hand valve communicates with the outlet of the second pipeline. An outlet of the first water pump communicates with an inlet of the third hand valve. An outlet of the cleaning fluid buffering tank communicates with an inlet of the first water pump. The cleaning fluid buffering tank comprises an acid addition opening, a water addition opening and a filter. The acid addition opening is connected with an acid addition device, the water addition opening is connected with a water addition device, and an outlet of the filter communicates with an inlet of the cleaning fluid buffering tank. An inlet of the fourth hand valve communicates with the second inlet, and an outlet of the fourth hand valve communicates with an inlet of the filter. The technical effects that the pipelines do not need to be replaced, magnesium ammonium phosphate crystals in the sewage treatment pipelines are efficiently removed, and the cost islow are achieved.