Use of corn carbon as an additive to enhance magnesium metal self-corrosion and recover phosphorus from swine wastewater in the form of struvite

Recovery of phosphate from swine wastewater is significant for alleviating eutrophication in aquatic ecosystems and addressing the increasing scarcity of phosphorus resources. In this study, a method for phosphate recovery from swine wastewater using corn carbon as an additive and non-dynamic magnesium metal self-corrosion was studied. The effects of reaction time, C:Mg mass ratio, stirring rate, and aeration rate on phosphate recovery were discussed, and eight experimental models were explored. The results demonstrated that when the optimal reaction time was 7 h, the mass ratio of corn carbon to the magnesium plate was 5:1. When the stirring rate was 800 rpm/min and the aeration rate was 0.48 m³/L·h, the pH value of wastewater was 9.24, and the phosphate recovery rate was 95.61%. The recovered precipitate was characterized by SEM-EDS and XRD as struvite with excellent crystal shape. This method not only successfully achieved waste treatment but also recovered phosphorus from swine wastewater.