Treatment of Phosphate Wastewater by Struvite Precipitation Method

摘要

In the present invention, phosphoric acid and ammonia nitrogen are dissolved in the supernatant by adjusting the pH to 2.0-5.5 by adding slaked lime or quicklime slurry to the phosphoric acid wastewater containing ammonia nitrogen and then reacting to precipitate fluorine in the wastewater. , Adding a Mg compound to the supernatant, adjusting the pH to 6.0 to 10.5 by adding a pH adjusting agent, and then reacting to precipitate ammonia nitrogen by Struvite precipitation. And a method of treating wastewater. The method of treating phosphoric acid wastewater according to the present invention is an economical treatment method capable of removing ammonia nitrogen using a conventional neutralization, flocculation and precipitation process without ammonia nitrogen removal rate of 95% or more. In addition, it does not require the use of expensive purified phosphoric acid as compared with the Struvite precipitation method, and is an economical and environmentally friendly method capable of removing all harmful substances such as fluorine, ammonia nitrogen, and phosphorus.