The reduction of hexavalent chromium by scrap iron was investigated in continuous system,
using long-term column experiments, for aqueous Cr (VI) solutions having low buffering
capacities, over the pH range of 2.00–7.30. The results showed that the initial pH of Cr (VI)
solution significantly affects the reduction capacity of scrap iron. The highest reduction
capacity was determined to be 19.2 mg Cr (VI)/g scrap iron, at pH 2.50, and decreased with
increasing the initial pH of Cr (VI) solution. A considerable decrease in scrap iron reduction …

Hexavalent chromium reduction with scrap iron has the advantage that two wastes are
treated simultaneously. The reduction of hexavalent chromium by scrap iron was
investigated in continuous system, using as reducing agent the following scrap iron shapes
and sizes:(1) spiral fibers,(2) shavings, and (3) powder. The shape and size of scrap iron
were found to have a significant influence on chromium and iron species concentration in
column effluent, on column effluent pH and on Cr (VI) reduction mechanism. While for large …