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<p>The effluents generated by brassworking processes can be divided into washing waters and product waters. washing waters was characterized by a low concentration of contaminants and heavy metals, offering conditions favorable for the survival of exogenous microorganisms. In contrast, product waters presented a high pollutant load, including heavy metals, which can affect microbial activity. In our effluent, the wastewaters are mixed at the end and discharged directly into the environment, which is forbidden in Moroccan law 36-15. This practice poses a lot of environmental risks, as it leads to the discharge of untreated effluents, unfortunately impacting ecosystems and public health. Our study is based on the comparison between the two types of brassworking wastewaters using the Student’s t-test. This confirms that the majority of contaminants were coming from product waters, with a COD at 688.253 mg/L ± 14.222, chloride ions at 4023.333 mg/L ± 542.271, Ni at 948.270 mg/L, Cu at 264.340 mg/L, Ag at 292.960 mg/L, and Zn at 8.062 mg/L. These concentrations result from the use of chemical products during the treatment of metallic parts. However, the study of the relationship between the various parameters is very important to explain its evolution in the effluent using correlation matrices and principal component analysis between physicochemical parameters first, then between microbiological parameters and trace metal elements, and finally between microbiological and physicochemical parameters.</p>

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Assessment of the effect of brassware contaminants on the load of the discharged effluent using multivariate statistical methods

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Fatima Ez-zahrae Mrizak,
  • Mohamed Chedadi,
  • Halima Amakdouf,
  • Malika Ammari,
  • Mazrha Abdelhadi,
  • Mohammed Merzouki

摘要

The effluents generated by brassworking processes can be divided into washing waters and product waters. washing waters was characterized by a low concentration of contaminants and heavy metals, offering conditions favorable for the survival of exogenous microorganisms. In contrast, product waters presented a high pollutant load, including heavy metals, which can affect microbial activity. In our effluent, the wastewaters are mixed at the end and discharged directly into the environment, which is forbidden in Moroccan law 36-15. This practice poses a lot of environmental risks, as it leads to the discharge of untreated effluents, unfortunately impacting ecosystems and public health. Our study is based on the comparison between the two types of brassworking wastewaters using the Student’s t-test. This confirms that the majority of contaminants were coming from product waters, with a COD at 688.253 mg/L ± 14.222, chloride ions at 4023.333 mg/L ± 542.271, Ni at 948.270 mg/L, Cu at 264.340 mg/L, Ag at 292.960 mg/L, and Zn at 8.062 mg/L. These concentrations result from the use of chemical products during the treatment of metallic parts. However, the study of the relationship between the various parameters is very important to explain its evolution in the effluent using correlation matrices and principal component analysis between physicochemical parameters first, then between microbiological parameters and trace metal elements, and finally between microbiological and physicochemical parameters.