Dataset Information

From harmful Microcystis blooms to multi-functional core-double-shell microsphere bio-hydrochar materials.

ABSTRACT: Harmful algal blooms (HABs) induced by eutrophication is becoming a serious global environmental problem affecting public health and aquatic ecological sustainability. A novel strategy for the utilization of biomass from HABs was developed by converting the algae cells into hollow mesoporous bio-hydrochar microspheres via hydrothermal carbonization method. The hollow microspheres were used as microreactors and carriers for constructing CaO₂ core-mesoporous shell-CaO₂ shell microspheres (OCRMs). The CaO₂ shells could quickly increase dissolved oxygen to extremely anaerobic water in the initial 40?min until the CaO₂ shells were consumed. The mesoporous shells continued to act as regulators restricting the release of oxygen from CaO₂ cores. The oxygen-release time using OCRMs was 7 times longer than when directly using CaO₂. More interestingly, OCRMs presented a high phosphate removal efficiency (95.6%) and prevented the pH of the solution from rising to high levels in comparison with directly adding CaO₂ due to the OH^- controlled-release effect of OCRMs. The distinct core-double-shell micro/nanostructure endowed the OCRMs with triple functions for oxygen controlled-release, phosphorus removal and less impact on water pH. The study is to explore the possibility to prepare smarter bio-hydrochar materials by utilizing algal blooms.

SUBMITTER: Bi L

PROVIDER: S-EPMC5684341 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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From harmful Microcystis blooms to multi-functional core-double-shell microsphere bio-hydrochar materials.

Bi Lei L Pan Gang G Pan Gang G

Scientific reports 20171113 1

Harmful algal blooms (HABs) induced by eutrophication is becoming a serious global environmental problem affecting public health and aquatic ecological sustainability. A novel strategy for the utilization of biomass from HABs was developed by converting the algae cells into hollow mesoporous bio-hydrochar microspheres via hydrothermal carbonization method. The hollow microspheres were used as microreactors and carriers for constructing CaO<sub>2</sub> core-mesoporous shell-CaO<sub>2</sub> shell ...[more]

PMID: 29133868

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Project description:Harmful Algal Blooms (HABs) are of global concern, as their presence is often associated with socio-economic and environmental issues including impacts on public health, aquaculture and fisheries. Therefore, monitoring the occurrence and succession of HABs is fundamental for managing coastal regions around the world. Yet, due to the lack of adequate in situ measurements, the detection of HABs in coastal marine ecosystems remains challenging. Sensors on-board satellite platforms have sampled the Earth synoptically for decades, offering an alternative, cost-effective approach to routinely detect and monitor phytoplankton. The Red Sea, a large marine ecosystem characterised by extensive coral reefs, high levels of biodiversity and endemism, and a growing aquaculture industry, is one such region where knowledge of HABs is limited. Here, using high-resolution satellite remote sensing observations (1km, MODIS-Aqua) and a second-order derivative approach, in conjunction with available in situ datasets, we investigate for the first time the capability of a remote sensing model to detect and monitor HABs in the Red Sea. The model is able to successfully detect and generate maps of HABs associated with different phytoplankton functional types, matching concurrent in situ data remarkably well. We also acknowledge the limitations of using a remote-sensing based approach and show that regardless of a HAB's spatial coverage, the model is only capable of detecting the presence of a HAB when the Chl-a concentrations exceed a minimum value of ~ 1 mg m-3. Despite the difficulties in detecting HABs at lower concentrations, and identifying species toxicity levels (only possible through in situ measurements), the proposed method has the potential to map the reported spatial distribution of several HAB species over the last two decades. Such information is essential for the regional economy (i.e., aquaculture, fisheries & tourism), and will support the management and sustainability of the Red Sea's coastal economic zone.

Dataset Information

From harmful Microcystis blooms to multi-functional core-double-shell microsphere bio-hydrochar materials.

Publications

From harmful Microcystis blooms to multi-functional core-double-shell microsphere bio-hydrochar materials.

Similar Datasets

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