Removal of Thiosulfate from Aqueous Solution via Air Advanced Oxidation Process

Wastewater stream from industrial plants, including petroleum refineries,
chemical plants, pulp and paper plants, mining operations, electroplating operations
and food processing plants, may contain offensive substances such as cyanide,
sulfides, sulfites, thiosulfate and disulfides that tend to increase the chemical oxygen
demand (COD) of the wastewater streams. Thiosulfate is an oxyanion of sulfur
produced by reaction of sulfite ions with elemental sulfur in high temperature water.
As some countries have a limitation for thiosulfate concentration, especially in the
wastewater stream, the removal of thiosulfate is one of the major concerns by most of
industries. This research and experimental project will be focusing in removal
thiosulfate by using Air Advanced Oxidation Process (AOP). In this particular
project, air is use as the medium because it is an unlimited source and oxidation
process is naturally happen in the atmosphere. The experiment will be conduct in
chemical laboratory. Some parameters such as thiosulfate and oxygen concentration,
air fiowrate, pH and temperature will be manipulate, monitor, record and finally the
data will be trend for analyze process. These factors are believed to be the important
factors in the real environment of removing thiosulfate. The expected result of the
experiment is the thiosulfate concentration drop and sulfate formation. The analysis
of the result will be done using UV Visible Spectrophotometer to determine the
effectiveness of the study. At the end of the project, the kinetic model for the process
would be developed.