Dynamics of phosphorus–iron–sulfur at the sediment–water interface influenced by algae blooms decomposition

Han, Chao; Ding, Shiming; Yao, Ling; Shen, Qiushi; Zhu, Chungang; Wang, Yan; Xu, Di

doi:10.1016/j.jhazmat.2015.07.009

Cited by 141 publications

(26 citation statements)

References 49 publications

(60 reference statements)

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“…Reference source not found.4d). Previous studies point out that organic matter in the anoxic sediment could be degraded together with N transformations from organic N to NH4 + -N within two weeks (Han et al, 2015;Xu et al, 2013). This is consistent with our results that NH4 + -N increased between 19 and 33 days and decreased in the subsequent days in all the three systems (Error!…”

Section: Manipulating Nutrients Fluxes At Swisupporting

confidence: 93%

Combating hypoxia/anoxia at sediment-water interfaces: A preliminary study of oxygen nanobubble modified clay materials

Zhang

Lyu

et al. 2018

Science of The Total Environment

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Combating hypoxia/anoxia is an increasingly common need for restoring natural waters suffering from eutrophication. Oxygen nanobubble modified natural particles were investigated for mitigating hypoxia/anoxia at the sediment-water interface (SWI) in a simulated column experiment. By adding oxygen nanobubble modified zeolites (ONMZ) and local soils (ONMS), the oxygen nanobubble concentrations (10-10 particles/mL) were several orders of magnitude higher in the water than the original water solution (10 particles/mL) within 24 h. In the column experiment, an oxygen-locking surface sediment layer was formed after capping with ONMZ and ONMS particles. The synergy of diffusion of oxygen nanobubbles and retention of oxygen in this layer contributes to both the increase of DO and reversal of hypoxic conditions. The overlying water had significantly higher dissolved oxygen (DO) values (4-7.5 mg/L) over the experimental period of 127 days in ONMZ and ONMS compared with the control systems (around 1 mg/L). Moreover, the oxidation-reduction potential (ORP) was reversed from -200 mV to 180-210 mV and maintained positive values for 89 days in ONMZ systems. In the control systems, ORP was consistently negative and decreased from -200 mV to -350 mV. The total phosphorus (TP) flux from sediment to water across the SWI was negative in the ONMZ and ONMS treated systems, but positive in the control system, indicating the sediment could be switched from TP source to sink. The oxygen-locking capping layer was crucial in preventing oxygen consumption caused by the reduced substances released from the anoxic sediment. The study outlines a potentially promising technology for mitigating sediment anoxia and controlling nutrient release from sediments, which could contribute significantly to addressing eutrophication and ecological restoration.

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Section: Manipulating Nutrients Fluxes At Swisupporting

confidence: 93%

Combating hypoxia/anoxia at sediment-water interfaces: A preliminary study of oxygen nanobubble modified clay materials

Zhang

Lyu

et al. 2018

Science of The Total Environment

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“…This indicated the massive decomposition of the cyanobacteria-derived POM. Subsequently, a number of black particles appeared in the overlying water and sediments, which was similar to previous reports (Steinberg, 2003;Duan et al, 2014;Han et al, 2015) and probably related to the settling of POM. After the 20th day, the sedimentary detritus layer at the bottom decreased in thickness and black particles gradually disappeared.…”

Section: Visual Changes and Physicochemical Environment Associated Wisupporting

confidence: 90%

Peer Review #2 of "Migration and transformation of dissolved carbon during accumulated cyanobacteria decomposition in shallow eutrophic lakes: a simulated microcosm study (v0.1)"

2018

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The decomposition processes of accumulated cyanobacteria can release large amounts of organic carbon and affect the carbon cycling in shallow eutrophic lakes. However, the migration and transformation mechanisms of dissolved carbon (DC) require further study and discussion. In this study, a 73-day laboratory microcosm experiment using suction samplers (Rhizon and syringe) was conducted to understand the migration and transformation of DC during the cyanobacteria decomposition. The decomposition of cyanobacteria biomass caused anoxic and reduction conditions, and changed the acidbase environment in the water column. During the early incubation (days 0-18), a large amount of cyanobacteria-derived particulate organic matter (POM) was decomposed into dissolved organic carbon (DOC) in the overlying water, reaching the highest peak value of 1.82 g/L in the treatment added the high cyanobacteria biomass (470g). After 18 days of incubation, the mineralization of increased DOC to dissolved inorganic carbon (DIC) maintained a high DIC level of overlying water in treatments added cyanobacteria biomass. The treatment added the medium cyanobacteria biomass (235g) presented the lower DOC/TDC ratio than the high cyanobacteria biomass associated with the lower mineralization from DOC to DIC. Due to the concentration differences of DIC at watersediment interface, the main migration of DIC from pore water to overlying water occurred in the treatment without added cyanobacteria biomass. However, the treatments added the cyanobacteria biomass presented the obvious diffusion of DOC and the low migration of DIC at the water-sediment interface. The diffusive fluxes of DOC at the water-sediment interface increased with the cyanobacteria biomass added, reaching the maximum value of 411.01 mg/(m 2 •d) in the treatment added the high cyanobacteria biomass. In the overlying water, the group added the sediment and medium cyanobacteria biomass

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“…Yuan et al (2015) also revealed that microalgae (mainly Microcystis) can become enriched in Pb, Cd, Ni and Zn by biosorption and bioaccumulation and thus may enhance the risk to the ecosystem. Moreover, eutrophication would result in a change in the environmental conditions of the sediment-water interface, such as redox conditions and pH (Han et al, 2015). Therefore, part of the heavy metals in Fe-Mn oxide, organic and sulfide forms may become remobilized (De Jonge et al, 2012;Simpson and Batley, 2009).…”

Section: Sqgs Assessmentmentioning

confidence: 99%

Spatial distribution, contamination and ecological risk assessment of heavy metals in surface sediments of Erhai Lake, a large eutrophic plateau lake in southwest China

Liu

Zhang

et al. 2016

CATENA

185

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Dynamics of phosphorus–iron–sulfur at the sediment–water interface influenced by algae blooms decomposition

Cited by 141 publications

References 49 publications

Combating hypoxia/anoxia at sediment-water interfaces: A preliminary study of oxygen nanobubble modified clay materials

Combating hypoxia/anoxia at sediment-water interfaces: A preliminary study of oxygen nanobubble modified clay materials

Peer Review #2 of "Migration and transformation of dissolved carbon during accumulated cyanobacteria decomposition in shallow eutrophic lakes: a simulated microcosm study (v0.1)"

Spatial distribution, contamination and ecological risk assessment of heavy metals in surface sediments of Erhai Lake, a large eutrophic plateau lake in southwest China

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