Capping with activated carbon reduces nutrient fluxes, denitrification and meiofauna in contaminated sediments

Bonaglia, Stefano; Rämö, Robert; Marzocchi, Ugo; Bouille, Léonie Le; Leermakers, Martine; Nascimento, Francisco J. A.; Gunnarsson, Jonas S.

doi:10.1016/j.watres.2018.10.083

Cited by 37 publications

(16 citation statements)

References 54 publications

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“…The day after the flux incubation experiments (Days 2, 6, 10), incubations were carried out to monitor the rates of denitrification and DNRA based on the isotope pairing technique (Nielsen 1992). The incubation protocol followed was slightly modified from Bonaglia et al (2019). Briefly, the incubation tank water was spiked with 15

{NO}_{3}^{-}

, which mixed with endogenous 14

{NO}_{3}^{-}

.…”

Section: Methodsmentioning

confidence: 99%

“…Nutrients and O 2 fluxes across the sediment-water interface were measured over three time points (Days 1, 5, and 9) following OM settling. Sediment cores were incubated for $ 9 h, and the procedure followed that described in Bonaglia et al (2019). This incubation method led to an average O 2 consumption of 33.3% AE 1.0% of the O 2 concentration present at incubation start.…”

Section: Sediment Cores Incubations For Nutrient Fluxes Denitrification and Dnra Ratesmentioning

confidence: 99%

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Influence of settling organic matter quantity and quality on benthic nitrogen cycling

Albert

Bonaglia

Stjärnkvist

et al. 2021

Limnology & Oceanography

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Coastal sediments are major contributors to global carbon (C) mineralization and nutrient cycling and are tightly linked to processes in the pelagic environment. In this study, we aimed to investigate the regulating potential of quantity and quality of planktonic organic matter (OM) deposition on benthic metabolism, with a particular focus on nitrogen (N) cycling processes. We simulated inputs of spring (C : N 10.9) and summer (C : N 5.6) plankton communities in high and low quantities to sediment cores, and followed oxygen consumption, nutrient fluxes as well as nitrate reduction rates, that is, denitrification and dissimilatory nitrate reduction to ammonium for 10 d. Our results demonstrate the primary importance of OM quality in determining the fate of organic N once it settles to the sediment surface. Settling of N-rich summer plankton material resulted in a $ twofold lower denitrification efficiency (40-56%) compared to N-poor spring plankton (88-115%). This indicates that N-rich plankton deposition favors recycling of inorganic nutrients to the water column over N-loss via denitrification. OM quantity was positively related to mineralization activity, but this neither directly affected N fluxes nor denitrification activity, highlighting the complex interplay between the OM quantity and quality in regulating N cycling. In light of these new findings, we support the use of simple qualitative indicators such as C : N ratio of OM to investigate how future changes in benthic-pelagic coupling might influence N budgets at the sediment-water interface.

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{NO}_{3}^{-}

, which mixed with endogenous 14

{NO}_{3}^{-}

.…”

Section: Methodsmentioning

confidence: 99%

Section: Sediment Cores Incubations For Nutrient Fluxes Denitrification and Dnra Ratesmentioning

confidence: 99%

Influence of settling organic matter quantity and quality on benthic nitrogen cycling

Albert

Bonaglia

Stjärnkvist

et al. 2021

Limnology & Oceanography

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“…The composite TLC treatment of POL + AC showed even higher PO 4 3– retention (−69%). AC has previously been shown to reduce PO 4 3– fluxes in the Baltic Sea sediment, perhaps due to an Al content of 0.75% (here corresponding to 4.5 g Al m– 2 ) . The 1200 g m– 2 Polonite dose produced a relatively thin 2–3 mm cap and would need to be increased to reach similar efficacy to the Al injection used in this study.…”

Section: Resultsmentioning

confidence: 65%

“…AC has previously been shown to reduce PO 4 3− fluxes in the Baltic Sea sediment, perhaps due to an Al content of 0.75% (here corresponding to 4.5 g Al m− 2 ). 38 The 1200 g m− 2 Polonite dose produced a relatively thin 31 2−3 mm cap and would need to be increased to reach similar efficacy to the Al injection used in this study. Applying a thin-layer cap in situ is less complex than the repeated sediment injections, and Polonite TLC may represent a more cost-effective approach to mitigate eutrophication in systems with high internal PO 4 Fluxes of NH 4 + were studied as a proxy for ammonification, that is, biological mineralization of organic nitrogen.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

Sediment Remediation with New Composite Sorbent Amendments to Sequester Phosphorus, Organic Contaminants, and Metals

Wikström

Bonaglia

Rämö

et al. 2021

Environ. Sci. Technol.

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This study tested two sediment amendments with active sorbents: injection of aluminum (Al) into sediments and thin-layer capping with Polonite (calcium–silicate), with and without the addition of activated carbon (AC), for their simultaneous sequestration of sediment phosphorus (P), hydrophobic organic contaminants (HOCs), and metals. Sediment cores were collected from a eutrophic and polluted brackish water bay in Sweden and incubated in the laboratory to measure sediment-to-water contaminant release and effects on biogeochemical processes. We used diffusive gradients in thin-film passive samplers for metals and semi-permeable membrane devices for the HOC polychlorinated biphenyls and polycyclic aromatic hydrocarbons. Al injection into anoxic sediments completely stopped the release of P and reduced the release of cadmium (Cd, −97%) and zinc (Zn, −95%) but increased the sediment fluxes of PAH (+49%), compared to the untreated sediment. Polonite mixed with AC reduced the release of P (−70%), Cd (−67%), and Zn (−89%) but increased methane (CH4) release. Adding AC to the Al or Polonite reduced the release of HOCs by 40% in both treatments. These results not only demonstrate the potential of innovative remediation techniques using composite sorbent amendments but also highlight the need to assess possible ecological side effects on, for example, sedimentary microbial processes.

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“…Results indicated that zeolite and illite were promising cap amendments to address nitrogen-and P-based chemicals, respectively. Bonaglia et al (2019) studied how meiofauna and biogeochemical processes were impacted by powdered activated carbon in contaminated sediment relative to clay. They noted a decrease in denitrification, an increase in pH and a depletion of natural organic carbon.…”

Section: Cappingmentioning

confidence: 99%

Contaminated aquatic sediments

Jaglal¹

2020

Water Environment Research

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Jawed and Krantzberg (2019) identified best practices to follow when remediating sediment sites based on experience gained at the Randle Reef Site in Ontario, Canada. The authors identify a list of challenges to overcome that fall under a broad series of headings that include issues associated with social, regulatory, political, and technical topics. Bianchini, Cento, Guzzini, Pellegrini, and Saccani (2019) reviewed more than 150 historical articles, written over the previous 50 years, to identify alternative

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Capping with activated carbon reduces nutrient fluxes, denitrification and meiofauna in contaminated sediments

Cited by 37 publications

References 54 publications

Influence of settling organic matter quantity and quality on benthic nitrogen cycling

Influence of settling organic matter quantity and quality on benthic nitrogen cycling

Sediment Remediation with New Composite Sorbent Amendments to Sequester Phosphorus, Organic Contaminants, and Metals

Contaminated aquatic sediments

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