Abstract
A considerable amount of the constituents in wastewater of the pulp and paper mill industry is not biodegradable. As an alternative to the usual coagulation, flocculation, and sedimentation of the substances, the combination of ozonation and a subsequent biological treatment step has been proposed. Ozonation in combination with microbiological treatment was employed to remove ligninsulfonic acid and refractory organic substances from the effluent of a paper mill wastewater treatment plant. Laboratory experiments showed that ligninsulfonic acid was converted into low‐molecular‐weight acids which were biodegradable.
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