부산대학교 도서관

A model has been developed to represent the liquid-phase reduction of hexavalent chromium by sulfur dioxide, the simultaneous competitive reaction of dissolved oxygen with sulfur dioxide, and oxygen reaeration. The model is applicable to both batch and continuous stirred tank reactors and gives conservative results compared to batch and continuous-flow data. Sulfur dioxide and its salts reduce hexavalent chromium to the trivalent state. The reaction rate increases with increasing reactant concentration and temperature and decreasing pH. Residual chromium is lower in a batch reactor than in a continuous reactor of equal residence time.