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Influence of Fe2O3 and bacterial biofilms on Cu(II) distribution in a simulated aqueous solution: A feasibility study to sediments in the Pearl River Estuary (PR China).

Kurniawan, Tonni Agustiono and Lo, Waihung and Othman, Mohd. Hafiz Dzarfan and Liang, Xue and Goh, Hui Hwang and Chew, Kit Wayne (2023) Influence of Fe2O3 and bacterial biofilms on Cu(II) distribution in a simulated aqueous solution: A feasibility study to sediments in the Pearl River Estuary (PR China). Journal of Environmental Management, 329 (117047). NA-NA. ISSN 0301-4797

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Official URL: http://dx.doi.org/10.1016/j.jenvman.2022.117047

Abstract

This study investigated physico-chemical interactions among Cu(II), biogenic materials, and Fe2O3 in a continuous-flow biofilm reactor system under a well-controlled environment. The effects of Fe2O3 and bacterial biofilms on the distribution of Cu(II) in a simulated aquatic environment were studied. To control biological and abiotic elements in the marine environment, a biofilm reactor was designed to understand the metal speciation of Cu(II) and its distribution. The reactor consisted of a biofilm chamber equipped with glass slides for biofilms attachment. Due to its ability to grow as biofilm in the medium, Pseudomonas atlantica was cultivated to adsorb trace Cu(II) to attached and suspended cells. It was found that biofilms with 170–285 mequiv chemical oxygen demand (COD) concentration/m2 of total oxidizable materials accelerated the Cu(II) adsorption to the surface of the reactor significantly by a factor of five. A significant inhibition to the bacterial growth took place (p ≤ 0.05; t-test) when Cu(II) concentration was higher than 0.5 mg/L. In the absence of Cu(II), bacterial cells grew normally to 0.075 of optical density (OD). However, at the Cu(II) concentration of 0.2 mg/L, the cells grew to a lower OD of 0.58. The presence of glycine and EDTA substantially reduced the toxicity of Cu(II) on bacterial growth (p ≤ 0.05; paired t-test). Their complexation with Cu(II) rendered the metal ions less available to bacterial cells. This implies that the Fe2O3 and bacterial biofilm affected Cu(II) distribution and speciation in the aquatic environment.

Item Type:Article
Uncontrolled Keywords:Adsorption; Biological treatment; Geochemistry; Greater Bay; Heavy metals; Toxicity.
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:106627
Deposited By: Muhamad Idham Sulong
Deposited On:14 Jul 2024 09:26
Last Modified:14 Jul 2024 09:26

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