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Bacterial remediation of heavy metal polluted soil and effluent from paper mill industry.

Authors
  • Nwaehiri, Uloma Linda1
  • Akwukwaegbu, Peter Ikechukwu2
  • Bright Nwoke, Bertram Ekejiuba3
  • 1 Department of Environmental Biology, Federal Polytechnic Nekede, Owerri, Nigeria. , (Niger)
  • 2 Department of Biochemistry, University of Port Harcourt, Choba, Nigeria. , (Niger)
  • 3 Department of Animal and Environmental Biology, Imo State University, Owerri, Nigeria. , (Niger)
Type
Published Article
Journal
Environmental analysis, health and toxicology
Publication Date
Jun 01, 2020
Volume
35
Issue
2
Identifiers
DOI: 10.5620/eaht.e2020009
PMID: 32600007
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Bacterial remediation of heavy metal polluted soil and effluent from paper mill was investigated using standard analytical methods. The paper mill was visited for 6 months at interval of 30 days to collect soil and effluent samples for the analysis. The pH of soil was slightly alkaline while effluent was acidic. There was a significant increase (P < 0.05) in total organic carbon (TOC) of soil; and turbidity, biochemical oxygen demand (BOD), chemical oxygen demand (COD) and TOC of effluent when compared to control. Bacteria isolated from the samples were grouped into two and used to remediate eight heavy metals. The remediation experiment consists of three treatments; Treatment 1 (treated with proteobacteria), Treatment 2 (treated with non-proteobacteria) and Treatment 3 (without bacteria) (control experiment). Result of the remediation study showed that there was a significant decrease (P < 0.05) in Treatment 1 and Treatment 2 of all the heavy metals in soil and effluent samples from day 30-180 when compared to day 0. The rate of removal of heavy metals in soil was highest in Treatment 1 for chromium (Cr; 0.00846 day-1) and lowest in Treatment 1 for cadmium (Cd; 0.00403 day-1) while the rate of removal in effluent was highest in Treatment 1 for zinc (Zn; 0.01207 day-1) and lowest in Treatment 1 for Cd (0.00391 day-1). It was concluded that bacteria isolated from soil and effluent samples were capable of remediating the concentration of Pb, arsenic (As), Cr, Zn and nickel (Ni) heavy metals.

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