Research on resourceful disposal of organosilicon wastewater containing magnesium

ABSTRACT In this paper, iron–carbon micro-electrolysis as well as Fenton oxidation are adopted to degrade the organism in wastewater containing magnesium. And then the generated Fe 3+ was used to coprecipitate with Mg 2+ in the wastewater to prepare layered double hydroxides (LDHs). The wastewater achieves a 73% decreasement in chemical oxygen demand (COD) under the optimum condition of pH = 2 and iron–carbon ratio = 1:3 through iron–carbon micro-electrolysis while a 77% decreasement in COD is achieved under the optimum condition of pH = 3 with 6 mL/L H 2 O 2 and 2 g/L FeSO 4 ·7H 2 O via Fenton oxidation. After treatment, the wastewater containing magnesium with COD of 248 mg/L and removal efficiency of 93% meets the sewage drainage standard. Furthermore, the efficient resourceful utilization of magnesium can be achieved through synthesis of magnesium iron layered double hydroxides (MgFeCl-LDH).