DETERMINATION OF OXYGEN DIFFUSION-COEFFICIENT IN WASTEWATERS

A novel method is proposed in this study for determining the dissolved oxygen (DO) diffusion coefficient in industrial wastewaters. The meth od is based on the principle of measuring the average DO concentration during the diffusion process. A specially designed experimental appar atus with an appropriate operating procedure and a mathematical equati on are necessary in the determination of the DO diffusion coefficient. The accuracy of the estimated DO diffusion coefficient using the pres ent method was compared with that reported in the literature and was f ound to be quite good. Extended test runs were conducted to examine th e effects of various types of surfactants on the DO diffusion coeffici ent. Determination of the DO diffusion coefficient in the raw textile wastewater was demonstrated as a practical example.