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Anoxia remediation and internal loading modulation in eutrophic lakes using geoengineering method based on oxygen nanobubbles
Zhang, Honggang; Chen, Jun; Han, Mingli; An, Wei; Yu, Jianwei
2020-04-20
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume714Pages:1-11
AbstractBenthic anoxia and internal P release, widely occurring in eutrophic lakes, are major factors threatening the health of aquatic ecosystems. In this paper, we experimentally evaluated the efficacy of a new type of flock-lock geoengineering method based on oxygen nanobubble technology to remediate sediment anoxia and reduce the internal P release in waters with and without algal blooms. Oxygen-carrying materials (OCM) modified from natural zeolites were used as capping agents and an oxygen-locking layer consists of OCM and the oxidized sediment was formed between anoxic sediment and overlying water. The synergy of diffusion and retention of oxygen in this layer contributes to both the increase of DO and reversal of anoxic conditions. By capping with OCM, the DO in overlying water improved instantly from around 1.5 mg/ to 3.5 4 mg/L and 5 6 mg/L in the systems with algal blooms and without algal blooms, respectively, and maintained throughout the incubation period. The oxygen penetration depth in the sediment can be significantly enhanced from around 0 cm to 3 cm and form an oxygen-locking layer at the end of the experiment by capping with OCM. The labile P was effectively retained via the re-oxidation of ferrous iron in this layer compared with the obvious release of labile P and Fe in control. More importantly, the oxygen depletion and labile P increase at the sediment-water interface caused by the decomposition of the deposited algal biomass can be substantially eliminated after capping with OCM. The study shed insights on the sustainable modulation of sediment anoxia and internal loading in eutrophic waters. (C) 2020 Elsevier B.V. All rights reserved.
Department环境水质学国家重点实验室
KeywordOxygen nanobubbles Internal phosphorus Algal blooms Sediment anoxia Geoengineering
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/44899
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Zhang, Honggang,Chen, Jun,Han, Mingli,et al. Anoxia remediation and internal loading modulation in eutrophic lakes using geoengineering method based on oxygen nanobubbles[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,714:1-11.
APA Zhang, Honggang,Chen, Jun,Han, Mingli,An, Wei,&Yu, Jianwei.(2020).Anoxia remediation and internal loading modulation in eutrophic lakes using geoengineering method based on oxygen nanobubbles.SCIENCE OF THE TOTAL ENVIRONMENT,714,1-11.
MLA Zhang, Honggang,et al."Anoxia remediation and internal loading modulation in eutrophic lakes using geoengineering method based on oxygen nanobubbles".SCIENCE OF THE TOTAL ENVIRONMENT 714(2020):1-11.
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