Chemical Removal of Cu and Zn from Swine Feces before Soil Application

Cu and Zn are known to be abundant in swine feces; hence, concentrations of these metals need lowered before feces applied land order prevent potential environmental problems. The main objective this study was develop an appropriate chemical process remove from using acid extractions. removal efficiencies decreased the H2SO4 > HNO3 organic acids (citric oxalic acids). Owing highest by H2SO4, it selected for further elimination feces. By optimal concentration, solid-to-liquid ratio, reaction time were 2%, 1:50, 8 h, respectively. At optimum conditions, concentration 198 mg/kg 40.1 474 80.0 mg/kg, with rates 79.7% 83.1%, low efficiency, resulting strong complexation between matter feces, improved increase solution concentrations. However, about half total nitrogen (TN) also removed indicating that treated may have poor value as fertilizer. Additional studies required find method maintain TN while simultaneously removing Zn.