See more from this Session: Chemistry of Metal(loids) and Trace Elements in Soils
Tuesday, November 2, 2010: 8:30 AM
Long Beach Convention Center, Room 202B, Second Floor
Iron based wastewater treatment residuals were incorperated with simulated waste products (aluminum cans, plastic, paper, yards waste, and dog food) and placed in large columns (1 m by 3 m). The initial material was wet to 50% moisture capacity and leachate from the columns was monitored for pH, ORP, conductivity, dissolved oxygen, and a sweet of elements (As, Fe, Al, NA, Ca, Mg, Cl, Mn, Ni ,Cu, Zn, and Pb). Solid samples were collected after two and half years and analyzed by X-ray absorption spectroscopy for As and Fe. Results indicate the initial Fe-hydroxide phase was dissolved and/or transformed to either a siderite, Fe(II) oxide or iron sulfide phase depending on the location within the column and the column temperature.