Traditional bleaching has been used in industries, such as the pulp and paper industry, using chlorine-based agents. However, the use of these substances is coming under stricter guidelines, so alternative solutions are being applied.

Ozone is a powerful oxidant, even at low temperatures, meaning that it has a fast reaction time and effective bleaching properties. It also allows the elimination of acute toxicity and chlorophenolics, increasing the biodegradability of the effluent. The result of this procedure is twofold, with the first being the improvement of the environment and with it the regulation compliance. The second is that ozone treatment makes it possible for the water quality to reach such a high level that it becomes possible to recycle and reuse it, thus greatly reducing overall water usage in the process and making the treatment financially and environmentally preferable.