DEGRADATION STUDIES ON ANIONIC AND NON-IONIC SURFACTANTS BY OZONATION

摘要

A lab scale study on the degradation of anionic and non-ionic surfactants in aqueous solution was carried over by ozonation in order to study the effect of ozonation and its operational variables such as ozone concentration, ozonation time and ionic nature of surfactants. Two types of surfactants namely Sodium Dodecyl Sulphate (SDS) an anionic surfactant and Tween 80 (T80) a non-ionic surfactant were taken and the degradation was recorded in terms of their Critical Micille Concentration (CMC) values, Chemical Oxygen Demand (COD) and absor-bance for spectrum light. In terms of CMC the residual surfactant concentrations after ozonation were about 4 mg/L in the case of SDS and 1.25 mg/L for T80. In absorbance study the degradation efficiency was noted to be about 86.67%for SDS and 97.14% for T80 and the residual concentrations were found to be 4 mg/L and 2mg/L respectively. COD reduction was measured as 73% and 77% for T80 and SDS respectively.