Nitrogen exchange across the sediment-water interface after dredging: The influence of contaminated riverine suspended particulate matter

Liu, Cheng; Chen, Kaining; Wang, Zhaode; Fan, Chengxin; Gu, Xiaohong; Wei, Huang

doi:10.1016/j.envpol.2017.07.054

Cited by 19 publications

(6 citation statements)

References 45 publications

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“…Similar phenomenon has been discovered in this study's authors' previous findings of the studied area (Liu et al, 2017a). The high content of organic matter and the microbial activity and the resultant low OPD and OUR were shown to be responsible for this phenomenon (Liu et al, 2017a). Therefore, oxygen was considered to be a significant indicator for the exchanges of NH þ 4 -N and SRP across the SWI in the studied area.…”

Section: Resultssupporting

confidence: 87%

“…The sediment maintains very high labile NH þ 4 -N throughout the year (Figure 7), which would dissolve to the pore water because of the low OPD and OUR (Brandes and Devol, 1997). Similar phenomenon has been discovered in this study's authors' previous findings of the studied area (Liu et al, 2017a). The high content of organic matter and the microbial activity and the resultant low OPD and OUR were shown to be responsible for this phenomenon (Liu et al, 2017a).…”

Section: Resultssupporting

confidence: 84%

“…Therefore, the implementation of dredging should better be carried out during winter in this bay area, but not around the river mouth. According to the previous studies (Liu et al, 2017a;Liu et al, 2016a), the introducing of large amount of contaminated SPM from the incoming rivers gave rise to the internal loadings quickly after dredging. Sediment capping is another commonly used technique to reduce internal P loadings.…”

Section: Resultsmentioning

confidence: 93%

“…The oxygen uptake rate (OUR) of the sediment was calculated based on zero-order kinetics according to Rasmussen and Jorgensen (1992). The detailed calculation method was referred to Liu et al (2017a).…”

Section: Methodsmentioning

confidence: 99%

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Nitrogen and Phosphorus Exchanges Across the Sediment–Water Interface in a Bay of Lake Chaohu

Liu

Chen

et al. 2018

Water Environment Research

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A year-long field investigation was carried out in the most heavily polluted bay of Lake Chaohu to assess the temporal exchanges of ammonium nitrogen (NH þ 4 -N) and soluble reactive phosphorus (SRP) across the sediment-water interface (SWI) and to provide remediation advises. Results showed that the monthly average fluxes of NH þ 4 -N and SRP were 31.38 and 6.98 mg m -2 d -1 , respectively, both of which were higher than those in many other hyper-eutrophic lakes around the world. The exchanges of NH þ 4 -N and SRP were both closed related to the oxygen penetration. Low oxygen penetration depth and generally negative oxygen uptake rates provoked the dissolution of redox sensitive phosphorus and labile NH þ 4 -N in the sediment and increased the fluxes. In addition, the generally higher fluxes during late spring to autumn should be noted during the reduction of internal loadings, when applicable techniques should be implemented accordingly to achieve better reduction effects. Water Environ. Res., 90, 1956Res., 90, (2018.

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Section: Resultssupporting

confidence: 87%

Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

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Nitrogen and Phosphorus Exchanges Across the Sediment–Water Interface in a Bay of Lake Chaohu

Liu

Chen

et al. 2018

Water Environment Research

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“…Various approaches have been developed to reduce nutrient loadings from sediment, including dredging [7], aeration or oxygenation [8], use of chemical flocculants [9] and in situ capping [10]. Among them, capping of contaminated sediment has been suggested to be potentially the most effective method for the control of eutrophication in lakes [11,12].…”

Section: Introductionmentioning

confidence: 99%

Exploring a multifunctional geoengineering material for eutrophication remediation: Simultaneously control internal nutrient load and tackle hypoxia

Zhang

Lyu

Liu

et al. 2021

Chemical Engineering Journal

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An effective approach for control of internal nutrient loading and sediment hypoxia remains a longstanding challenge to the restoration of aquatic ecosystems. In order to simultaneously tackle these issues, a MultiFunction Geoengineering material (MFG) was developed for sediment remediation through the synergistic functions of physical capping, nutrient adsorption and delivery of O2 nanobubbles. The MFG, derived from natural zeolite, exhibited superior (1.5-4 times higher) adsorption capabilities for both phosphate (PO4 3--P) and ammonium (NH4 + -N), than pristine zeolite. The O2 adsorption capacity was also enhanced from 46, observed in the natural zeolite, to 121 mg O2/g for the MFG. An in-situ sediment capping experiment in a eutrophic lake demonstrated that the application of MFG dramatically reversed sediment hypoxia (ORP -200 mV) to an aerobic status (ORP 175 mV) and, furthermore, stimulated sediment microbial activity, particularly nitrifying bacteria. The MFG treatment resulted the sediment changing from a nutrient source to a sink through decreasing the cumulative PO4 3--P and NH4 + -N fluxes from the sediment by 124.6% and 131.1%, respectively. Moreover, the comprehensive functionalities of the material have been, for the first time, quantified, from which data O2 nanobubble delivery was determined to be the largest contributor, reducing the fluxes of PO4 3--P and NH4 + -N by 57.3% and 56.1% of, respectively. Our findings highlight the viability of such multifunctional material for the remediation of internal nutrient loads in lacustrine environments, towards sustainable eutrophication control.

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Assessment of iron-modified calcite/zeolite mixture as a capping material to control sedimentary phosphorus and nitrogen liberation

Zhan

Lin

et al. 2019

Environ Sci Pollut Res

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Nitrogen exchange across the sediment-water interface after dredging: The influence of contaminated riverine suspended particulate matter

Cited by 19 publications

References 45 publications

Nitrogen and Phosphorus Exchanges Across the Sediment–Water Interface in a Bay of Lake Chaohu

Nitrogen and Phosphorus Exchanges Across the Sediment–Water Interface in a Bay of Lake Chaohu

Exploring a multifunctional geoengineering material for eutrophication remediation: Simultaneously control internal nutrient load and tackle hypoxia

Assessment of iron-modified calcite/zeolite mixture as a capping material to control sedimentary phosphorus and nitrogen liberation

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