1. Modeling the oxidation of sulfide in pulp and paper wastewaters
- Author
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Palumbo, James E., Brown, Linfield C., and Stratton, Stephen C.
- Subjects
Oxidation-reduction reaction -- Models ,Wastewater -- Chemical properties ,Sulfides -- Properties ,Engineering and manufacturing industries ,Environmental issues - Abstract
Reactor experiments were conducted to study aerobic sulfide oxidation in pulp and paper wastewaters under typical operating conditions. Data produced from these experiments were used to develop a set of sequential rate equations that describe the significant sulfide and oxygen processes in the reactors. Model parameters were estimated for three different pulp and paper wastewaters using a multiresponse procedure. The sulfide oxidation rate coefficients for the wastewaters ranged from 0.108 to 0.155 [min.sup.-1] at 35[degrees]C and approximately neutral pH. The reaction order with respect to oxygen could not be precisely estimated but appeared to be near the lower boundary for the fitting procedure (essentially zero order). Modeling of the oxygen depletion data provided evidence that the first sulfide oxidation reaction product consumed 0.5 mg of oxygen per mg of sulfide oxidized, suggesting polysulfides and elemental sulfur as the initial reaction products. The oxygen depletion modeling also suggested oxidation of the initial reaction product to a more stable intermediate which is postulated to be thiosulfate. DOI: 10.1061/(ASCE)EE.1943-7870.0000248 CE Database subject headings: Models; Hydrogen sulfides; Estimation; Paper mills; Waste stabilization ponds; Oxidation. Author keywords: Models; Hydrogen sulfides; Estimation; Paper mills; Waste stabilization ponds. more...
- Published
- 2010