Evaluation of green microalgal strains for simultaneous municipal wastewater treatment and heavy metal bioremediation

IF 2.8 4区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Elvis Kodzo Ahiahonu, William Wilson Anku, Ashira Roopnarain, Mahloro Hope Serepa-Dlamini, Penny Poomani Govender
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引用次数: 0

Abstract

BACKGROUND

Microalga-assisted wastewater treatment systems have gained attention for their efficiency in removing nutrients, chemical oxygen demand, toxic heavy metals and other dissolved compounds, while also producing valuable biomass and demonstrating high CO2 biofixation potential. The current research focuses on investigating the municipal wastewater phycoremediation and heavy metal biosorption ability of three indigenous freshwater microalgal strains: Tetradesmus reginae, Tetradesmus obliquus and Chlorella sorokiniana.

RESULTS

The research findings indicate that the microalgal strains T. reginae, T. obliquus and C. sorokiniana exhibited notable performance in biomass accumulation. Specifically, the biomass accumulations were 2.215 ± 0.002, 1.143 ± 0.006 and 0.856 ± 0.021 g L−1, respectively, with initial culture biomasses ranging from 0.5 to 0.6 g L−1. These strains significantly reduced toxic heavy metals (As, 46.86–60.12%; Cd, 52.96–83.18%; Cr, 73.49–82.18%; and Pb, 95.38–96.25%), nutrients (NH4+ & NO3 100% and PO43− 78–86.41%) as well as chemical oxygen demand (46.02–67.35%), and biosequestered CO2 (0.8–0.18 gCO2 L−1 d−1) during the growth period. Among the strains, T. reginae emerged as the top performer. The Fourier transform infrared spectra of the strain's biomass confirmed the presence of specific functional groups, such as CH, NH, OH and CN, which play a crucial role in ionising and reacting with toxic metal ions and protons in the wastewater.

CONCLUSION

This study has shown that the isolated wild microalgal strains have promising phycoremediation and heavy metal adsorption characteristics. Moreover, they exhibit promising rates of CO2 biosequestration. These findings underscore the potential of microalga-assisted wastewater treatment systems for efficient and eco-friendly wastewater remediation, as well as biomass generation and CO2 mitigation. © 2024 Society of Chemical Industry (SCI).

评估绿色微藻菌株在城市污水处理和重金属生物修复中的作用
背景微藻辅助废水处理系统因其在去除营养物质、化学需氧量、有毒重金属和其他溶解化合物方面的高效率而备受关注,同时还能产生有价值的生物量并显示出较高的二氧化碳生物固定潜力。目前的研究重点是调查三种本地淡水微藻菌株的城市污水植物修复和重金属生物吸附能力:研究结果表明,T. reginae、T. obliquus 和 C. sorokiniana 微藻菌株在生物量积累方面表现突出。具体来说,生物量积累分别为 2.215 ± 0.002、1.143 ± 0.006 和 0.856 ± 0.021 g L-1,初始培养生物量为 0.5 至 0.6 g L-1。在生长期间,这些菌株明显减少了有毒重金属(As,46.86-60.12%;Cd,52.96-83.18%;Cr,73.49-82.18%;Pb,95.38-96.25%)、营养物质(NH4+ & NO3- 100% 和 PO43- 78-86.41%)以及化学需氧量(46.02-67.35%),并生物吸收了二氧化碳(0.8-0.18 gCO2 L-1 d-1)。在这些菌株中,T. reginae 表现最好。菌株生物质的傅立叶变换红外光谱证实了特定官能团的存在,如 CH、NH、OH 和 CN,这些官能团在电离废水中的有毒金属离子和质子并与之发生反应方面起着至关重要的作用。结论 本研究表明,分离出的野生微藻菌株具有良好的植物修复和重金属吸附特性。此外,它们还表现出良好的二氧化碳生物吸收率。这些发现强调了微藻辅助废水处理系统在高效、生态友好型废水修复、生物质生成和二氧化碳减排方面的潜力。© 2024 化学工业学会(SCI)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.00
自引率
5.90%
发文量
268
审稿时长
1.7 months
期刊介绍: Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.
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