Vermiremediation of metal(loid)s via Eichornia crassipes phytomass extraction: A sustainable technique for plant amelioration

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Publisher: Elsevier B.V.
Document Type: Report
Length: 420 words

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Keywords Phytoaccumulation; Bio-conversion; Vermiremediation; Arsenic; Plant growth promotion Highlights * Eichhornia crassipes (water hyacinth) is a potential aqueous phytoremediator. * Phytoremediation needs a further sustainable eco-friendly fate. * Phytoremediating hyacinths have been bio-converted to vermicompost. * Conjugation of phytoremediation-vermicompost reduces the bioavailability of toxic metal(loid)s from the system. * Application of vermicompost promotes organic farming for better vegetation. Abstract Eichhornia crassipes (water hyacinth), imparts deficiency of soluble arsenic and other toxic metal (loid)s through rhizofiltration and phytoaccumulation. Without proper management strategy, this phytoremediation of metal (loid)s might fail and get reverted back to the environment, contaminating the nearby water bodies. This study, focused on bio-conversion of phytoremediating hyacinths, spiked with 100 times and greater arsenic, lead and cadmium concentrations than the average water contamination, ranging in 58.81 [plus or minus] 0.394, 16.74 [plus or minus] 0.367, 12.18 [plus or minus] 0.153 mg Kg.sup.-1arsenic, 18.95 [plus or minus] 0.212, 9.53 [plus or minus] 0.054, 6.83 [plus or minus] 0.306 mg kg.sup.-1 lead and 2.79 [plus or minus] 0.033, 1.39 [plus or minus] 0.025, 0.92 [plus or minus] 0.045 mg kg.sup.-1 cadmium, respectively in root, shoot and leaves, proving it's phytoaccumulation capacity. Next, these hyacinths has been used as a source of organic supplement for preparing vermicompost using Eisenia fetida following analysis of total metal content and sequential extraction. Control soil was having 134.69 [plus or minus] 2.47 mg kg.sup.-1 arsenic in compare to 44.6 [plus or minus] 0.91 mg kg.sup.-1 at premature stage of compost to 23.9 [plus or minus] 1.55 mg kg.sup.-1 at mature compost indicating sustainable fate of phytoremediated vermicompost. This vermiremediation of arsenic and other toxic elements, restricted the bioavailability of soil pollutants. Furthermore, processed compost amended as organic fertilizer, growing chickpea, coriander, tomato and chilli plant, resulted in negligible metal(loid)s in treated samples, enhancing also plant's growth and production. Author Affiliation: (a) Earth and Environmental Science Research Laboratory, Department of Earth Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal 741246, India (b) Institute of Environment & Sustainable Development, Banaras Hindu University, Varanasi 221005, India (c) Department of Environmental Science, University of Calcutta, Ballygunge Circular Road, Kolkata 700019, India * Corresponding author. Earth and Environmental Science Research Laboratory, Department of Earth Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, West Bengal 741246, India. Article History: Received 24 March 2018; Revised 4 May 2018; Accepted 7 May 2018 Byline: Arnab Majumdar (a), Anil Barla (a), Munish Kumar Upadhyay (b), Dibyarpita Ghosh (c), Punarbasu Chaudhuri (c), Sudhakar Srivastava (b), Sutapa Bose [sutaparai@gmail.com] (a,*)

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Gale Document Number: GALE|A593691986