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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


BENDASSOLLI, José Albertino; MAXIMO, Everaldo; TAVARES, Glauco Arnold  and  IGNOTO, Raquel de Fátima. Chemistry waste and residues waters management at the stable isotope laboratory of the CENA/USP. Quím. Nova [online]. 2003, vol.26, n.4, pp.612-617. ISSN 0100-4042.

A system for disposal and recovery of the main effluents and chemical waist from isotope separation plants and enriched compounds-15N and 34S production has been carried out at the Stable Isotope Laboratory (LIE) of the CENA/USP. Around four hundred thousand liters of effluents has been recovered yearly. Among the recovered chemical wastes, the more relevant are: ammonia; brome; ammonium and sodium sulfate; sodium hydroxide; sulfur dioxide; and hydrochloric acid. Chemical wastes containg recoverable heavy metals (Ag, Cr and Cu) and solvents (methanol, ethanol and acetone) are processed and recovered. Gaseous emissions, mainly H2S are used for recovery of heavy metals solutions. The minimization of the residues waters, as well the reduction of electric energy consume was established using a water deionization system. A cost/effect balance of the process is reported.

Keywords : residues; treatment; management.

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