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Ecotoxicidade de efluentes brutos e tratados gerados por uma fábrica de medicamentos veterinários

Ecotoxicity of raw and treated effluents generated by a veterinary medicine industry

Resumos

Efluentes de indústrias farmacêuticas veterinárias, que formulam medicamentos, são gerados principalmente durante a lavagem dos equipamentos. O objetivo desse trabalho foi avaliar a toxicidade aguda para Daphnia similis e crônica para Ceriodaphnia dubia, dos efluentes brutos e tratados gerados por uma indústria farmacêutica veterinária. O sistema de tratamento de efluentes usado é composto por uma etapa de tratamento químico (coagulação-sedimentação forçada) seguida do tratamento biológico aeróbio (processo de lodos ativados). Foram realizadas 5 campanhas de amostragens entre outubro de 2011 e julho de 2012. As amostras de efluentes brutos apresentaram elevada toxicidade aguda e crônica (aguda: quarta campanha com CE50 - 48-h de <0,001% e crônica: terceira campanha com CI50 - 7d <0,0001%). As amostras de efluentes tratados quimicamente foram as mais tóxicas com CE50 - 48-h entre <0,001 e 0,1% e CI50 - 7-d entre 0,00001 e 0,0001%, provavelmente relacionada ao uso de sulfato de alumínio como agente floculante. O tratamento biológico levou a uma pequena diminuição da toxicidade dos efluentes. Os testes ecotoxicológicos foram adequados para detectar a toxicidade dos efluentes e úteis para avaliar a eficiência das etapas do tratamento. Melhorias no sistema de tratamento de efluentes da indústria estudada deveriam ser implementadas visando à redução da toxicidade observada nos efluentes finais.

Fármacos veterinários; efluentes industriais; avaliação ecotoxicológica


Effluents from veterinary pharmaceutical industries that formulate medicines are mainly generated during the washing of equipment. The aim of this work was to evaluate the acute toxicity to Daphnia similis and chronic toxicity to Ceriodaphnia dubia of raw and treated effluents generated by a veterinary pharmaceutical industry. The industrial effluent treatment system comprises a step of chemical treatment (coagulation-sedimentation forced) followed by aerobic biological treatment (activated sludge process). Five samplings campaigns were performed from October 2011 to July 2012. The raw effluent samples showed high acute and chronic toxicity (acute: fourth sampling with EC50 - 48-h of <0.001% and chronic: third sampling with IC50 - 7-d of <0.0001%). The chemically treated effluent samples were the most toxic with EC50 - 48-h between <0.001 and 0.1% and IC50 - 7-d between 0.00001 and 0.0001%. This increase in toxicity is probably related to the use of aluminum sulfate as flocculating agent. The biological treatment led to a small reduction in toxicity of the effluents. The selected ecotoxicological tests were adequate for detecting the effluent toxicity and useful for evaluating the efficiency of the steps of the effluent treatment. Improvements in the industrial wastewater treatment system should be implemented in order to reduce the observed toxicity of the final effluent.

Veterinary pharmaceuticals; industrial effluents; ecotoxicological assessment


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Datas de Publicação

  • Publicação nesta coleção
    08 Out 2013
  • Data do Fascículo
    Ago 2013
Instituto de Pesquisas Ambientais em Bacias Hidrográficas Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi), Estrada Mun. Dr. José Luis Cembranelli, 5000, Taubaté, SP, Brasil, CEP 12081-010 - Taubaté - SP - Brazil
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