Biological aqua crust mitigates metal(loid) pollution and the underlying immobilization mechanisms

Wang, Guobao; Yuan, Yongqiang; Morel, Jean-Louis; Feng, Zekai; Chen, Daijie; Lu, Chun-Feng; Guo, Min; Liu, Chong; Wang, Shizhong; Chao, Yuanqing; Tang, Yetao; Xiao, Shi; Zhang, Wei‐xian; Qiu, Rongliang

doi:10.1016/j.watres.2020.116736

Cited by 22 publications

(19 citation statements)

References 59 publications

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“…Meanwhile, SEM images showed that the surface of anammox granules was wrinkled in Phases 1–2 of R 1 , indicating that γ-Fe 2 O 3 NPs affected the growth of bacteria. According to previous studies, mineral particles, microorganisms, and extracellular polymers tended to aggregate into organic–inorganic complexes and further formed biological crusts on the sludge . A layer of visible biological crusts was formed on the granule surface in R 1 during Phase 3.…”

Section: Resultsmentioning

confidence: 83%

“…In contrast, the EPS content of R 0 remained relatively stable, and a regular granule morphology was observed. The SEM showed that organic–inorganic complex was formed through the aggregation of mineral particles and extracellular polymeric substances …”

Section: Resultsmentioning

confidence: 99%

“…According to previous studies, mineral particles, microorganisms, and extracellular polymers tended to aggregate into organic− inorganic complexes and further formed biological crusts on the sludge. 31 A layer of visible biological crusts was formed on the granule surface in R 1 during Phase 3. According to the XPS analysis in Phase 3, the proportion of C−Fe was 60.0% in R 1 , which was more than triple that of R 0 .…”

Section: Effect Of γ-Fe 2 O 3 Nps On Processmentioning

confidence: 99%

“…The SEM showed that organic− inorganic complex was formed through the aggregation of mineral particles and extracellular polymeric substances. 31 Adsorption Characteristics of γ-Fe 2 O 3 NPs on Anammox Granules. In Phases 1−3, 2.0−7.0 μg L −1 Fe (II) and 0.3−5.0 μg L −1 Fe (III) were detected in the effluent of R 1 (Figure 2).…”

Section: Effect Of γ-Fe 2 O 3 Nps On Processmentioning

confidence: 99%

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Insight into the Regulation Mechanism of Iron Oxide Nanoparticles in Anammox Consortia: Autophagy-Dependent Ferroptosis

Wang,

Hou,

Wang

et al. 2024

ACS EST Water

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Iron oxide nanoparticles (IONPs) have been widely used and pose a high risk to human and animal health. In this study, the fate and regulation mechanism of γ-Fe2O3 NPs in an anaerobic ammonium oxidation (anammox) system were studied from the perspective of morphology, biotransformation, and microbial interaction. The lowest nitrogen removal efficiency (NRE) of the anammox process was 63.8% under γ-Fe2O3 NP stress. The Fe(II) and Fe(III) concentrations increased with the bioaccumulation of γ-Fe2O3 NPs, which caused high-level reactive oxygen species (ROS) and ferroptosis in the anammox consortia. They inhibited the synthesis pathways of ATP and heme c, which further reduced the detoxification ability of microbiota. Moreover, Fe(II) could be oxidized to Fe(III) in the form of Fe(III)-O, which formed biocrusts on the cell surface and limited the microbial substrate utilization. Microbial community analysis showed that the low-concentration γ-Fe2O3 NPs increased the abundance of functional bacteria related to nitrogen transformation, while 50 mg L–1 of γ-Fe2O3 NPs significantly inhibited their activity and metabolism. These findings deepen our understanding of the Fe–N network and provide a guidance for the practical application and operation of anammox process, especially in treating wastewater containing iron oxide nanomaterials.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Effect Of γ-Fe 2 O 3 Nps On Processmentioning

confidence: 99%

Section: Effect Of γ-Fe 2 O 3 Nps On Processmentioning

confidence: 99%

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Insight into the Regulation Mechanism of Iron Oxide Nanoparticles in Anammox Consortia: Autophagy-Dependent Ferroptosis

Wang,

Hou,

Wang

et al. 2024

ACS EST Water

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“…Biological aqua crust (biogenic aqua crust—BAC) is a complex organo-mineral system composed of biotic components including microorganisms and their secretions, and abiotic components such as mineral particles in aquatic ecosystems [ 1 ]. Similar to the biological soil crust (BSC) that is known as an ecosystem engineer of ecological succession in arid and semi-arid areas [ 2 – 4 ], the BAC is expected to be capable of not only enriching large numbers of specific autotrophs and heterotrophs but also regulating the local and global biogeochemical fluxes of carbon and nitrogen even in extreme environments such as metal(loid)-rich ( e.g.…”

Section: Introductionmentioning

confidence: 99%

Novel biological aqua crust enhances in situ metal(loid) bioremediation driven by phototrophic/diazotrophic biofilm

et al. 2023

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Background Understanding the ecological and environmental functions of phototrophic biofilms in the biological crust is crucial for improving metal(loid) (e.g. Cd, As) bioremediation in mining ecosystems. In this study, in combination with metal(loid) monitoring and metagenomic analysis, we systematically evaluated the effect of biofilm in a novel biological aqua crust (biogenic aqua crust—BAC) on in situ metal(loid) bioremediation of a representative Pb/Zn tailing pond. Results We observed strong accumulation of potentially bioavailable metal(loid)s and visible phototrophic biofilms in the BAC. Furthermore, dominating taxa Leptolyngbyaceae (10.2–10.4%, Cyanobacteria) and Cytophagales (12.3–22.1%, Bacteroidota) were enriched in biofilm. Along with predominant heterotrophs (e.g. Cytophagales sp.) as well as diazotrophs (e.g. Hyphomonadaceae sp.), autotrophs/diazotrophs (e.g. Leptolyngbyaceae sp.) in phototrophic biofilm enriched the genes encoding extracellular peptidase (e.g. family S9, S1), CAZymes (e.g. CBM50, GT2) and biofilm formation (e.g. OmpR, CRP and LuxS), thus enhancing the capacity of nutrient accumulation and metal(loid) bioremediation in BAC system. Conclusions Our study demonstrated that a phototrophic/diazotrophic biofilm constitutes the structured communities containing specific autotrophs (e.g. Leptolyngbyaceae sp.) and heterotrophs (e.g. Cytophagales sp.), which effectively control metal(loid) and nutrient input using solar energy in aquatic environments. Elucidation of the mechanisms of biofilm formation coupled with metal(loid) immobilization in BAC expands the fundamental understanding of the geochemical fate of metal(loid)s, which may be harnessed to enhance in situ metal(loid) bioremediation in the aquatic ecosystem of the mining area.

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Mechanism of Deep-Sea Microbial-Mediated Synergistic Synthesis of Ferromanganese Oxidation Products Process for Heavy Metal Ion Adsorption

Liu,

Feng,

2023

JOM

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Biological aqua crust mitigates metal(loid) pollution and the underlying immobilization mechanisms

Cited by 22 publications

References 59 publications

Insight into the Regulation Mechanism of Iron Oxide Nanoparticles in Anammox Consortia: Autophagy-Dependent Ferroptosis

Insight into the Regulation Mechanism of Iron Oxide Nanoparticles in Anammox Consortia: Autophagy-Dependent Ferroptosis

Novel biological aqua crust enhances in situ metal(loid) bioremediation driven by phototrophic/diazotrophic biofilm

Mechanism of Deep-Sea Microbial-Mediated Synergistic Synthesis of Ferromanganese Oxidation Products Process for Heavy Metal Ion Adsorption

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