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This clissertation presents results from a research designecl to assess kraft pulp bleaching wastewater after biological anel physical-chemical treatment followecl by nanofi ltration filtration. The treatment was applied to eftluents from the alkaline anel acicl extraction at the bleaching plant anel were treated as collected, that is, without dilution. The overall remova! eft1ciencies were 83% for the COD, 95% for the BOD, 80% for the TOC. The treatment system provide total remova! of setteable solicls, turbiclity anel phosphorus. The residual colar was only 63 mg/IPt. Tota l solids remova!, which encompases chloride anel sulfate ions the remova! efficiency reachecl 70%, however the remova! of chloride ions was not significant. Comparing the final eflluent quality with the fresh water requirements it is possible to conclude that the treatment proviclecl a water quality close to the required for the preparation of chemicals usecl in chemical anel mechanical pulping.

Tratamento biológico e físico químico para reuso dos efluentes do estágio de branqueamento de polpa celulósica