Optimization of Growth Conditions of Acinetobacter sp. Cr1 for Removal of Heavy Metal Cr Using Central Composite Design
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Optimization of Growth Conditions of Acinetobacter sp. Cr1 for Removal of Heavy Metal Cr Using Central Composite Design Bingbing Pang1 · Lijun Lv1 · Caoping Pang1 · Fengcai Ye1 · Changhua Shang1 Received: 7 July 2020 / Accepted: 27 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Growth conditions can significantly affect the removal efficiency of heavy metals by microorganisms. The goal of this study was enhancing the removal efficiency of Cr(VI) and improving the application of Acinetobacter sp. Cr1 (GenBank accession number of 16S rDNA sequence, MN900681). This study focused on pH, Cr(VI) concentration and culture time, which were the major influence factors for removal efficiency of Cr(VI). A central composite design was employed to optimize the removal efficiency by optimizing three variables. The optimum growth conditions were as: pH of 9.52, Cr(VI) concentration of 128.55 mg l−1, culture time of 43.30 h, and the predicted and actual maxima were 65.13% and 67.26%, respectively. Therefore, it is suggested that the strain Acinetobacter sp. Cr1 had a promising potential to be used for bioremediation of Cr(VI).
Introduction Along with economic development and poor governance, there were many contaminated regions [1–3]. The sources of environmental pollution were different harmful chemicals, which contained particulate matter, polycyclic aromatic hydrocarbons, pesticides, heavy metals, plasticizers, hormones, dioxins, antibiotics and food additives [4]. Previous studies have indicated that a variety of diseases (such as immune system diseases, malignancies, Electronic Supplementary Material The online version of this article (https://doi.org/10.1007/s00284-020-02278-8) contains supplementary material, which is available to authorized users. * Changhua Shang [email protected] Bingbing Pang [email protected] Lijun Lv [email protected] Caoping Pang [email protected] Fengcai Ye [email protected] 1
College of Life Science, Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guangxi Normal University, No. 1, Yanzhong Road, Yanshan District, Guilin 541006, Guangxi, China
cardiovascular diseases, brain degenerative disorders and intellectual impairment) were related to environmental pollution. Among harmful pollutants, heavy metals had higher toxicity on human health through food chain [5–9]. The mining and smelting plants are one of the primary sources of heavy metals pollution. Heavy metals pollution mostly occurs in southern China with abundant mineral resources, for example Dachang town known as “China’s tin capital”. Heavy metals contaminated soil mainly contains heavy metals Cd, Cr and Hg in Dachang town. Cr is ubiquitous in the environment, which mostly occurs in Cr(III) and Cr(VI)] forms. While Cr(III) has limited toxicity, as a known occupational carcinogen of lung Cr(VI) is highly reactive and has higher toxicity at high concentrations [10]. Bioremediation of
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