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. 2024 Sep 2;14:20379. doi: 10.1038/s41598-024-71472-6

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 3 — Association of COD, BOD, TDS, DO, and chromium with bacterial load in TWW. (A) Bacterial load decreases as the COD level increases beyond a certain level. (B) BOD showed a slightly stronger negative correlation than that of COD. (C) TDS shows a strong negative correlation with bacterial load, suggesting that as the concentration of dissolved solids increases, the bacterial population tends to decrease. (D) Bacterial load is inversely proportional to the chromium concentration in TWW. (E) DO level shows a weak positive correlation with bacterial load.