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<p>Although economically important, the textile industry produces effluents with dyes, detergents, and heavy metals that require treatment to prevent environmental impacts. This study aimed to evaluate the effluents and sludge generated by laundry in the Agreste region of Pernambuco, using the zebrafish as a model. In addition to ecotoxicological tests, physicochemical characterization was performed to assess the effluent treatment plant's efficiency and identify present compounds. In the ecotoxicological tests, zebrafish embryos were exposed to different concentrations of raw effluent, treated effluent, and sludge elutriate to evaluate the effects on epiboly (8 hpf), teratogenic (24–144 hpf), and behavioral (144 hpf). The physicochemical analysis showed that, despite the reduction in some parameters after treatment, the effluents still contained high levels of chemical oxygen demand(COD) (348.83&#xa0;mg/L), chlorides (2705.83&#xa0;mg/L), and metals such as K (60.57&#xa0;mg/L), Al (9.43&#xa0;mg/L), Mn (2.10&#xa0;mg/L), Zn (1.64&#xa0;mg/L) and Sr (1.52&#xa0;mg/L), posing a potential environmental pollution. The ecotoxicological results revealed that effluents with dilutions above 25% caused delayed epiboly and high mortality at 8 hpf, with elutriate being the most toxic. Up to 144 hpf, elutriate caused higher mortality and teratogenic effects in all dilutions. Behavioral tests showed changes in all groups of effluent dilutions, indicating neurotoxicity. K, Al, Mn concentrations found in our work were linked to teratogenic and neurotoxic effects. Metal interactions with physicochemical parameters contribute to the complexity of toxicity, making it impossible to attribute effects to a single agent.</p>

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Analysis of the ecotoxicity of waste generated in a laundry in the textile center of the Agreste region of Pernambuco using zebrafish (Danio rerio) as a bioindicator

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Paula Raíza Alves Cavalcante,
  • Jadson Freitas da Silva,
  • Renatta Priscila Ferreira Silva,
  • Matheus Victor Viana de Melo,
  • Maria Letícia Santos Carnaúba da Silva,
  • Maria Eduarda Borges de Almeida,
  • Samara da Silva Gomes,
  • Yuri Mateus Lima de Albuquerque,
  • Rodrigo Cândido Passos da Silva,
  • Pabyton Gonçalves Cadena,
  • Rosângela Gomes Tavares

摘要

Although economically important, the textile industry produces effluents with dyes, detergents, and heavy metals that require treatment to prevent environmental impacts. This study aimed to evaluate the effluents and sludge generated by laundry in the Agreste region of Pernambuco, using the zebrafish as a model. In addition to ecotoxicological tests, physicochemical characterization was performed to assess the effluent treatment plant's efficiency and identify present compounds. In the ecotoxicological tests, zebrafish embryos were exposed to different concentrations of raw effluent, treated effluent, and sludge elutriate to evaluate the effects on epiboly (8 hpf), teratogenic (24–144 hpf), and behavioral (144 hpf). The physicochemical analysis showed that, despite the reduction in some parameters after treatment, the effluents still contained high levels of chemical oxygen demand(COD) (348.83 mg/L), chlorides (2705.83 mg/L), and metals such as K (60.57 mg/L), Al (9.43 mg/L), Mn (2.10 mg/L), Zn (1.64 mg/L) and Sr (1.52 mg/L), posing a potential environmental pollution. The ecotoxicological results revealed that effluents with dilutions above 25% caused delayed epiboly and high mortality at 8 hpf, with elutriate being the most toxic. Up to 144 hpf, elutriate caused higher mortality and teratogenic effects in all dilutions. Behavioral tests showed changes in all groups of effluent dilutions, indicating neurotoxicity. K, Al, Mn concentrations found in our work were linked to teratogenic and neurotoxic effects. Metal interactions with physicochemical parameters contribute to the complexity of toxicity, making it impossible to attribute effects to a single agent.