Study on the Arsenate Removal from Raw As(V)-Rich Wastewater Using Zero-Valent Iron

Due to the large volumes of solid waste produced by traditional arsenic-rich lime iron salt precipitation method treatment during wet-smelting precious metal workshops, raw As(V)-rich wastewater from a domestic metallurgical enterprise was chosen as research object. Zero-valent (ZVI) used remove arsenate (As(V)) wastewater. Factors affecting adsorption As(V), such ZVI size and time, were investigated. The As(V) removal percentage >98.2% when using 40, 100, 250, or 300 mesh in 2.8 mg·L−1 solution at pH 7, with an mass–wastewater ratio 5 g/100 mL, 12 h reaction time. >86.5% 40 after 50 min reaction. A comprehensive evaluation performed on effects factors cost water head loss. Here, for column-based separation, which mass very small. Column experiments indicated that adsorbent more efficiently eliminated comparison earlier reported adsorbents. High bed (BV) 3200 BV, 6300 8400 BV up breakthrough concentration 100 μg·L−1 achieved presence arsenic. empty contact times (EBCTs) 2.6 min, 5.1 9.8 respectively. Furthermore, concentrations other pollutants Cu2+, Zn2+, F−, Cd2+, Cr6+, Pb2+, F- met national discharge standard. elimination heavy metals solutions employing is efficient, cheap, produces no secondary environmental pollution, making it ideal candidate