Technique for processing ammonia-nitrogen wastewater employing struvite formation

The invention relates to a technique for processing an ammonia-nitrogen wastewater employing struvite formation. The technique comprises the following steps: adding certain magnesium source and phosphorus source to the wastewater, controlling a certain pH value; participating the sediments at the bottom of a reactor after reaction; separating out struvite by solid-liquid separation; entering the wastewater to an anaerobic tank to further process, and marketing the discharged struvite as a controlled release fertilizer, wherein the magnesium source and the phosphorus source respectively are magnesium chloride and sodium hydrogen phosphate; the optimal molar ratio of Mg to N to P is 1.2:1:0.8; the initial ammonia-nitrogen concentration is 210-1260mg/L; the pH of the wastewater is controlled to be 8-9; the solution for adjusting the pH to 2-6mol/L is a sodium hydroxide solution. The technical scheme provided by the invention cannot be limited by the temperature and toxin in water, the design and operation are si