A method of removing phosphates from water in a continuous process, the method comprising the steps of: (a) passing the water through a first zone in which the pH is adjusted; and (b) passing the water through a second zone in which the water is contacted with magnesium ions; wherein the water is contacted with ammonia in the first zone and/or in the second zone.

Polyphosphate compositions are produced by a process that includes the steps of continuously introducing a phosphate compound into a polymerization vessel, polymerizing the phosphate compound at a temperature of 250-450° C. for a time period sufficient to form the polyphosphate composition, and continuously discharging the polyphosphate composition from the polymerization vessel. The phosphate compound can be fed to the polymerization vessel in the form of an aqueous slurry containing 5-50 wt. % of the phosphate compound. Resulting polyphosphate compositions often contain at least 8 wt. % of a polyphosphate and less than 35 wt. % of the phosphate compound.

Separation methods and systems for converting high concentrations of animal wastes into nutrients and other useful products such as struvite and potassium struvite. Advantageously, the system and methods do not require the addition of external chemicals other than an acid and a base.

Methods and systems for removal and recovery of phosphorus from wastewater and producing inorganic phosphorus complexes including digestate recycle.

The disclosure provides an electromagnetic ionic liquid, which consists of ammonia water, diluent, EWT electronic water and macromolecular complex. The four components are mixed evenly at normal temperature and pressure in a certain proportion to prepare the electromagnetic ionic liquid. The electromagnetic ionic liquid can be used for extracting struvite from seawater, salt water or brine, which improves quality of the struvite, facilitates its industrial production and improves yield of struvite products. In addition, with the electromagnetic ionic liquid, elements required for crop growth and dozens of types of trace elements can be captured in the precipitate, which has great social and economic value for mass production, popularization and application of the struvite.

A struvite and a method for extracting the struvite from seawater, concentrated salt water or brine. NH.sub.4HCO.sub.3 and H.sub.3PO.sub.4 are added in the seawater, concentrated salt water or brine, and NH.sub.4HCO.sub.3, H.sub.3PO.sub.4 and the seawater, concentrated salt water or brine are stirred and well mixed to react. Then electromagnetic ionic liquid are dripped, with a dripping time controlled to be 30 to 50 min and pH value of the reaction solution to be within a range of 7.5 to 8.5, to generate white precipitate. Finally, the white precipitate is separated from the liquid, spin dried and packaged to obtain the struvite. The struvite has higher purity and fertilizer efficiency than natural struvite, and also contains potassium, calcium, sulfur and chlorine required for crop growth and dozens of types of trace elements such as molybdenum, zinc, manganese, iron, copper and selenium, which is more suitable for the crop growth.

The invention relates to a method and an assembly for recovering magnesium ammonium phosphate from slurry supplied to a reaction container (10) in which an aerobic milieu that is alkaline as a result of CO.sub.2-stripping is present and in which the slurry is guided in a circuit with the aid of ventilation. Cationic magnesium, such as magnesium chloride, is added to the slurry, and magnesium ammonium phosphate crystals which are crystallized out of the slurry are removed via a removal device (30) provided in the base region of the reaction container. The slurry is supplied from the first reaction container (10) to a second reaction container (12) via a first line (14), wherein an anaerobic milieu is set in the second reaction container in order to redissolve the phosphate, and MAP crystals crystallized in the second reaction container are supplied to the first reaction container.

The present invention relates to a process for preparing an ammonium vanadium phosphate of formula (NH.sub.4)(VO.sub.2)(HPO.sub.4). It also relates to a process for preparing a vanadium orthophosphate VPO.sub.4.

Process for the treatment of a phosphite-containing waste stream, said process comprising the following steps: (a) optionally neutralizing the waste stream to a pH in the range 6.0-8.0, (b) adding the following compounds to the waste stream in any order of addition: (i) an oxidizing compound in order to oxidize said phosphite towards phosphate, (ii) an NH.sub.4.sup.+ source, (iii) a Mg.sup.2+ source, thereby forming a precipitate, (c) followed by isolating the precipitate from the waste stream, wherein the process is conducted under atmospheric pressure and at a temperature not exceeding 90 C.

Methods and systems are provided for continuous-flow production of radioisotopes with high specific activity. Radioisotopes with high specific activity produced according to the methods described are also provided. The methods can include causing a liquid capture matrix to contact a target containing a target nuclide; irradiating the target with radiation, ionizing radiation, particles, or a combination thereof to produce the radionuclides that are ejected from the target and into the capture matrix; and causing the liquid capture matrix containing the radionuclides to flow from the target to recover the capture matrix containing the radionuclides with high specific activity. The methods are suitable for the production of a variety of radionuclides. For example, in some aspects the target nuclide is .sup.237Np, and the radionuclide is .sup.238Np that decays to produce .sup.238Pu. In other aspects, the target nuclide is .sup.98Mo, and the radionuclide is Mo that decays to produce .sup.99mTc.