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- Towards a sustainable production of biologically active building blocks from dye-rich wastewatersPublication . Fernandes, A.; Bonardo, L.; Royo, B.; Robalo, Maria Paula; Martins, L. O.Looking beyond the traditional economy of “take, make and dispose” we established a multi-step enzymatic system for an eco-friendly biological treatment of dye-rich wastewaters simultaneously producing commercially interesting compounds. The dyeing process is responsible for the release into the environment of about 2.8 × 105 tons of dyes and dyestuff each year. The major component of these wastewaters are azo (-N=N-) dyes, which are recalcitrant and hazardous molecules.