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Response surface method for optimization of process variables for bioaccumulation of metals with Jatropha curcas on fly ash–amended soil

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Abstract

Heavy metal contamination is a serious rising issue with the dumping of fly ash (FA). A recent focus of researches and practices tends towards reutilization of FA with bioremediation technique using various plants. The present research aimed to investigate optimum metal extraction in fly ash–amended soil using microbes and treated wastewater with Jatropha curcas plant using response surface methodology (RSM). The Box-Behnken design was used to determine the optimum condition for maximum metal remediation with three levels and three variables, viz., fly ash percentage (5, 12.5, 20%), microbial dose (0.5, 5.25, 10 ml), and contaminant level of water to irrigate the plant (freshwater, treated wastewater, untreated wastewater). The approach adopted was to set fly ash percentage as “maximum,” microbial dose as “minimum,” and contaminant level of water to irrigate the plant as “in range.” The outcome of the present research provided the best prediction models, integrated the process variables, and developed rotational curves for analyzing metal remediation in 360° rotation for Fe, Mn, Zn, Cu, and Al as responses of interest. The optimum conditions for maximum bioremediation from fly ash–amended soils by bioaccumulation on Jatropha curcas plant worked out as 13.866% fly ash, 4.088 ml microbial dose, and treated wastewater as type of water to irrigate the plant that bioaccumulated Fe, Mn, Zn, Cu, and Al as to 26.904, 0.760, 0.160, 0.162, and 12.895 mg/l.

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Data statement

The datasets generated during the current study are available from the corresponding author on reasonable request.

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Sandeep Jain: conceptualization; data curation; formal analysis; investigation; methodology; writing—original draft preparation. Ajay R. Tembhurkar: conceptualization; investigation; methodology; writing—original draft preparation & reviewing.

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Correspondence to Sandeep Jain.

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Jain, S., Tembhurkar, A.R. Response surface method for optimization of process variables for bioaccumulation of metals with Jatropha curcas on fly ash–amended soil. Environ Monit Assess 195, 580 (2023). https://doi.org/10.1007/s10661-023-11239-0

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