Quenching H2O2 Residuals Using Granular Activated Carbon: Effect of pH and Biodegradation

This thesis has two parts:Part IResidual H2O2, dissolved oxygen and pH data were observed for quenching of H2O2 by virgin, 1 year and 2 years old GAC in pilot columns. All GACs completely quenched 4 mg/L of H2O2 but not 10 mg/L H2O2. Active reaction sites in the columns were concentrated near the top for virgin and middle for aged GAC. Part IIPseudo first order reaction constant, k, for H2O2 quenching was measured for six different GACs, at three different age levels, in the pH range: 6.50 - 12.50. We observed a marked increase in k values above pH 11.00.H2O2 quenching by sand showed an increase from ~5% to ~10% in k value and from ~3% to ~10% in percentage quenching between week 3 and week 10 of bench scale experiments suggesting that biofilm was able to induce H2O2 quenching ability in an otherwise inert media.M.A.S