Bioremediation of heavy metals using microalgae: Recent advances and mechanisms

Leong, Yoong Kit; Chang, Jo Shu

doi:10.1016/j.biortech.2020.122886

Cited by 576 publications

(176 citation statements)

References 92 publications

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“…In living algal cells, the ability to treat wastewater depend on the growth rate, which directly determines the biomass concentration, and influences the total biosorption capacity of contaminants. Microalgae can be applied for the removal of the most common environmental pollutants as metals (Leong and Chang, 2020) and hydrocarbons (Luo et al, 2014), but also for newly emergent contaminants such as common pharmaceuticals (Xiong et al, 2018) and herbicides (González-Barreiro et al, 2006). Metal contamination in the environment represents one of the most serious threats to human health; phycoremediation of metals takes place through two main uptake systems: the first one, called biosorption, is defined as the binding of metallic species to the cell surfaces; the second, called bioaccumulation, is an active intracellular uptake across the cell membrane, that requires living biomass (i.e., Tam and Wong, 1997).…”

Section: Introductionmentioning

confidence: 99%

Isolation of Four Microalgal Strains From the Lake Massaciuccoli: Screening of Common Pollutants Tolerance Pattern and Perspectives for Their Use in Biotechnological Applications

et al. 2020

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Aquatic ecosystems represent one of the largest reservoirs of phytoplankton accounting for most of the primary production of the Earth. The Lake Massaciuccoli located in Tuscany (Italy) is one of the largest swamps that in ancient times entirely covered the Versilia coastal plain. Despite its peculiar features, especially the eutrophic characteristics, its native microalgal consortia have never been explored up to now. In this work, we isolated and described four autochthonous microalgal strains from different sites in the lake (FB, Idr, CL_Sc, and CL_Ch); the four microalgal strains were identified within the Chlorella sorokiniana clade. We exposed them to ten of the most common or emerging environmental contaminants in order to describe their preliminary response to the tested substances: five metals (As, Fe, Ni, Cu, and Zn), two herbicides (Metolachlor and Sethoxydim), two antibiotics (Ciprofloxacin and Benzylpenicillin) and a non-steroidal anti-inflammatory drug (Ibuprofen). Physiological response of the strains highlighted intraspecific differences; strain CL_Sc was the most tolerant in presence of metals while strain Idr was the most sensitive. All strains were sensitive to sethoxydim and tolerant to metolachlor at all the tested concentrations. Strains FB and Idr were the most sensitive in presence of Ibuprofen while strain CL_Ch was the most sensitive to the highest Benzylpenicillin concentration. Resistance pattern of strain Idr somehow reflects both the phylogenetic and the geographic “isolation” from all other three strains. Finally, optical microscope observation confirmed some differences also in the microalgae morphological aspect. Overall, all the strains showed interesting responses in presence of high concentrations of the tested substances, representing putative interesting candidates for water remediation in wastewater treatment plants.

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Section: Introductionmentioning

confidence: 99%

Isolation of Four Microalgal Strains From the Lake Massaciuccoli: Screening of Common Pollutants Tolerance Pattern and Perspectives for Their Use in Biotechnological Applications

et al. 2020

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“…Another aspect come into considerance, the change in microbial metabolism (Okino-Delgado et al, 2019), will release uncertain toxic compounds for the environment and health, indirectly acting as opposition microbial candidates in this context (Myhr and Traavik, 2002). Under the TSCA (Toxic Substances Control Act) (Gardner and Gunsch, 2020), the Office of Pollution Prevention and Toxics (OPPT) programs (Pietro-Souza et al, 2020) of the United States Environmental Protection Agency (Leong and Chang, 2020;Saxena et al, 2020) moniters the environmental and health risks and releases premanufacture legal notice for the accreditation of field research outlines and prototypes (McPartland and McKernan, 2017;Khan et al, 2020). A magnificant example is given by University of Tennessee.…”

Section: Ecological Safety and Risk Assessmentmentioning

confidence: 99%

Alternative Strategies for Microbial Remediation of Pollutants via Synthetic Biology

2020

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Continuous contamination of the environment with xenobiotics and related recalcitrant compounds has emerged as a serious pollution threat. Bioremediation is the key to eliminating persistent contaminants from the environment. Traditional bioremediation processes show limitations, therefore it is necessary to discover new bioremediation technologies for better results. In this review we provide an outlook of alternative strategies for bioremediation via synthetic biology, including exploring the prerequisites for analysis of research data for developing synthetic biological models of microbial bioremediation. Moreover, cell coordination in synthetic microbial community, cell signaling, and quorum sensing as engineered for enhanced bioremediation strategies are described, along with promising gene editing tools for obtaining the host with target gene sequences responsible for the degradation of recalcitrant compounds. The synthetic genetic circuit and two-component regulatory system (TCRS)-based microbial biosensors for detection and bioremediation are also briefly explained. These developments are expected to increase the efficiency of bioremediation strategies for best results.

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“…Leong and Chang (2020) discovered that the reactive groups with active binding sites, such as carboxyl and hydroxyl, on the surface of microalgal cells can combine with cationic ions. 35 The maximum sorption of chromium (Cr), cadmium (Cd), and arsenic (As) by Chlorella sp. can reach 140 mg/g, 303 mg/g, and 3.89 mg/g, respectively.…”

Section: Contamination Of Microalgae Biomassmentioning

confidence: 99%

“…can reach 140 mg/g, 303 mg/g, and 3.89 mg/g, respectively. 35 Therefore, in some cases, if the wastewater from livestock farms or sewage plants is treated by microalgae, the heavy metals will be enriched in the biomass and then accumulate in the aquatic animals. In a realworld application, the contamination of microalgae biomass not only causes economic loss by increasing the mortality of aquatic animals, but also results in safety problems threatening the humans' health as the contaminants accumulate in the food chain.…”

Section: Contamination Of Microalgae Biomassmentioning

confidence: 99%

Emerging trends of culturing microalgae for fish‐rearing environment protection

Yang

2020

J of Chemical Tech & Biotech

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The application of microalgae biotechnology, which can recover nutrients from wastewater, improve water quality, and feed some aquatic animals, is becoming an emerging trend in the development of eco-friendly aquaculture. Previous studies explored a variety of models to support the use of microalgae in aquaculture practice, verifying the feasibility and advantages of microalgae-based aquaculture. However, a couple of bottlenecks and problems jeopardizing the application of microalgae biotechnology in aquaculture are discovered in the research and industrial practice. This work, hence, summarizes the research progress and the current opinions relating with the microalgae-based aquaculture and proposes some critical thoughts about the bottlenecks challenging its industrial implementation.

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Bioremediation of heavy metals using microalgae: Recent advances and mechanisms

Cited by 576 publications

References 92 publications

Isolation of Four Microalgal Strains From the Lake Massaciuccoli: Screening of Common Pollutants Tolerance Pattern and Perspectives for Their Use in Biotechnological Applications

Isolation of Four Microalgal Strains From the Lake Massaciuccoli: Screening of Common Pollutants Tolerance Pattern and Perspectives for Their Use in Biotechnological Applications

Alternative Strategies for Microbial Remediation of Pollutants via Synthetic Biology

Emerging trends of culturing microalgae for fish‐rearing environment protection

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