RESEARCHING THE ABILITY TO TREAT AMMONIUM IN WASTEWATER IN PIG FARM BY MAGNESIUM PRECIPITATION METHOD (MAP)

Abstract

This paper studies the ability to treat ammonium in wastewater in pig farm by magnesium precipitation method. The research model includes 1 deposit tank, a reaction tank with dimensions of 30x30x40 cm and a stirring device. Wastewater quality was surveyed for 4 days from November 15, 2022 to November 18, 2022 with a frequency of 3 times/day at 7:00, 13:00 and 19:00. The survey shows that the molar ratio of Mg²⁺: NH₄⁺ : PO₄^3- = 1.2 : 1 : 1 was the most optimal. The model was operated with water samples at 19h 16/11/2022 with pH and NH₄⁺ concentrations before and after the biogas tank reaching 8.2 and 248; 6.8 and 157mg/l respectively. The model operation results show that the suitable reaction time for pig breeding wastewater treatment by MAP precipitation method was 25 minutes. MAP precipitation method to ammonium treatment in pig breeding wastewater can achieve high treatment efficiency, and MAP precipitation can be used as fertilizer in agriculture.