Study on the effect of efficiency recovery ammonium and phosphate in rubber wastewater by struvite precipitation

Abstract

The removal and recovery of Ammonium and phosphorus from rubber wastewater is an important issue to reduce water and environmental pollution. The aim of this study was to recover N and P from rubber wastewater through a crystallization process at different operational conditions. The effects of pH, Mg/P/NH4 molar ratio, and reaction time on the yield of struvite recovery were discussed. The results showed that at the pH value of 9.5, The reaction time is 60 minutes, the optimal mole ratio Mg²⁺: P-PO₄^3-: N-NH₄ is 1.3: 1: 1, the efficiency of ammonium and phosphorus removal is 82 and 96%, respectively; The volume of struvite precipitate obtained is 4.16 g/liter of rubber wastewater.