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(T/EH091) AOX methodology accommodation in ecotoxicological characterization of residual bath. Molins, Gemma1, Gibert, Carles1, Vallès, Bettina1, Riva, Carme1, 1 ABSTRACT- Leather tanning wastewaters have a lot of pollution. One part of it is the organohalogenated compounds. Their remarkable presence in tannery sector necessitates an inquirement of its origin, its changes in the productive process and its alteration and biodegradability in the biological treatment of tannery wastewaters. In the present study, the accommodation of microcoulombimetic methodology for adsorbable organohalogen compounds (AOX) analysis has been done to the residual efluents from the cromium leather tanning process. For the AOX analysis the standard DIN 38409 H14 (ISO 9562) has been followed with the batch method and multiple adsorption. Possible interferences coming from the main residual compounds of tannery baths have been studied. The AOX presence in different auxiliar products used in the process has also been searched for in view of its posible replacement. Finally, AOX have been analized in different residual baths and in the wastewater treatment plant. Results point out the presence of these kinds of compounds in some baths. The double or triple adsorption in activated carbon allows a lower detection limit and a smaller error, due to the lower dilution done in the sample. This work has been subventioned by the "Comisiòn Interministerial de Ciencia y Tecnologìa CICYT AMB 99-0746. Key words: AOX, Effluents, Tannery, Leather |
