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Effects of Black Liquor Shocks on the Stability of Activated Sludge Treatment of Kraft Pulp Mill Effluent: Morphological Alteration in Daphnia magna and Mutagenicity and Genotoxicity Response in Salmonella typhimurium

Author

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  • Soledad Chamorro

    (Center Europe Latin America (EULA)-Chile, Environmental Engineering & Biotechnology Group (GIBA-UDEC), Environmental Science Faculty, Universidad de Concepción, Concepcion 4070386, Chile)

  • Laura Hernández

    (Center Europe Latin America (EULA)-Chile, Environmental Engineering & Biotechnology Group (GIBA-UDEC), Environmental Science Faculty, Universidad de Concepción, Concepcion 4070386, Chile)

  • Katia Saéz

    (Department of Statistics, Faculty of Mathematics and Physical Sciences, Universidad de Concepción, Concepcion 4070386, Chile)

  • Gloria Gómez

    (Center Europe Latin America (EULA)-Chile, Environmental Engineering & Biotechnology Group (GIBA-UDEC), Environmental Science Faculty, Universidad de Concepción, Concepcion 4070386, Chile)

  • Gladys Vidal

    (Center Europe Latin America (EULA)-Chile, Environmental Engineering & Biotechnology Group (GIBA-UDEC), Environmental Science Faculty, Universidad de Concepción, Concepcion 4070386, Chile)

Abstract

The objective of this study is to evaluate the stability of activated sludge (AS) in the treatment of kraft pulp mill effluent exposed to black liquor shock, as well as the effect of its exposure on the morphology of Daphnia magna and DNA damage through mutagenicity and genotoxicity response in Salmonella typhimurium . To this end, we applied doses of 2-, 4-, 10-, and 30-mL black liquor/L influent—shock 1 (S1), shock 2 (S2), shock 3 (S3), and shock 4 (S4), respectively—to kraft pulp mill effluent. The system stability was checked by analyzing heterotrophic biomass activity and discharge quality, evaluated using Ames test and Daphnia magna . The results show that the chemical oxygen demand (COD) removal efficiency for normal conditions was 64.84%, falling to 61.68%, and 61.31% for S1 and S2, respectively, and values of 52.11% for S3 and 20.34% for S4. The biomass activity decreased after each shock was applied, but then recovered. There was no evidence of lethal toxicity (LC 50 ) to Daphnia magna at any of the concentrations. Therefore, it is feasible to apply doses S1 and S2 to an AS system that treats kraft pulp mill effluent.

Suggested Citation

  • Soledad Chamorro & Laura Hernández & Katia Saéz & Gloria Gómez & Gladys Vidal, 2022. "Effects of Black Liquor Shocks on the Stability of Activated Sludge Treatment of Kraft Pulp Mill Effluent: Morphological Alteration in Daphnia magna and Mutagenicity and Genotoxicity Response in Salmo," Sustainability, MDPI, vol. 14(7), pages 1-12, March.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:7:p:3869-:d:779140
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    References listed on IDEAS

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    1. Vincenzo Torretta & Marco Ragazzi & Ettore Trulli & Giovanni De Feo & Giordano Urbini & Massimo Raboni & Elena Cristina Rada, 2014. "Assessment of Biological Kinetics in a Conventional Municipal WWTP by Means of the Oxygen Uptake Rate Method," Sustainability, MDPI, vol. 6(4), pages 1-15, April.
    2. Gladys Vidal & Yenifer González & Benjamín Piña & Mayra Jarpa & Gloria Gómez, 2021. "Minimization of Environmental Impact of Kraft Pulp Mill Effluents: Current Practices and Future Perspectives towards Sustainability," Sustainability, MDPI, vol. 13(16), pages 1-15, August.
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