Determination of I activity concentration and rate in main inflows and outflows of Salitre wastewater treatment plant (WWTP), Bogota.

Samples were collected for several weeks to determine the evolution of the I (Iodine-131) activity concentration in the inflow water processed at the Salitre wastewater treatment plant (WWTP) in Bogota, Colombia, derived from medical facilities for thyroid cancer diagnosis and treatment. Mass balances on I were performed based on the activity rates at the main inflow and outflow of the plant. The I activity concentration in the raw water stream was observed to increase significantly from Monday onwards throughout the week, while the daily activity concentration was highest in the morning and then continuously decreased over the rest of the day.