Treatment of Carboxymethyl Cellulose using a Combined Process of Ozonation and Biodegradation.

Abstract

To establish a textile dye wastewater treatment methods, the ozonation and the successive biodegradation of carboxymethyl cellulose (CMC) which was widely used as thickener for textile printing process were investigated. The degradation of CMC by the ozonation was affected by the initial pH, that the higher the initial pH, the lager the reduction of TOC and carboxymethyl group. At the initial pH 12, TOC was reduced to 50% by ozonation for 240 min, and reduced to 95% of initial TOC value by the successive biodegradation. It can be therefore, said that biodegradability of CMC is improved by the ozonation. Further more, by the ozonation with H202 and the ozonation with buffer solution for restrained lower initial pH, the oxidation efficiency and biodegradability were more improved. Therefore, ozonation for 120 min was carried out for aqueous CMC solution with pH 7 (buffer solution) under copresence of H202 at 100mg/l concentration. The TOC in the solution was reduced to 70% by the ozonation, and reduced to more than 99% of initial value at the successive biodegradation. It was conclusively found that CMC could be completely mineralized by a combined method of the ozonation and the biodegradation.