An Evaluation of Ferrous Iron Oxidation Kinetics in a Multiple Orifice Spray Reactor
A bench scale experiment using a multiple orifice spray reactor was investigated as a potential remediation technology for the rapid oxidation of ferrous iron in acidic mine discharges. The multiple orifice spray reactor makes use of flow through multiple orifices to enhance aqueous aeration and oxidation rates. The reactor consists of two concentric cylinders, the inner cylinder having a series of orifices which act in a manner similar to a venturi. In this fashion neutralization and aeration are combined into a single step due to the aspiration of air as a result of a pressure gradient across the reactor which allows for the suction of an alkaline agent in to the reaction chamber.
Results show ferrous iron oxidation rates at pH values between 6 and 7 can be increased by four orders of magnitude as compared to theoretical oxidation rates. At an influent ferrous iron concentration of around 150 mg/L and pH of 6, the orifice spray reactor can achieve conversions to ferric iron of about 30% within one second.
Advisor:R. Quimpo; L. Casson; R. D. Neufeld
School:University of Pittsburgh
School Location:USA - Pennsylvania
Source Type:Master's Thesis
Keywords:civil and environmental engineering
Date of Publication:06/20/2005