Evaluation of biogeochemical reactivity of fresh and weathered contaminated dredged sediments

Couvidat, Julien; Neculita, Carmen Mihaela; Benzaazoua, Mostafa; Genty, Thomas; Chatain, Vincent

doi:10.1007/s11368-016-1578-z

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…As reduced species of sulfur, metallic sulfides are highly sensitive to oxidation, susceptible to release associated trace metals and metalloids [30,33,40]. Sulfides oxidation and sulfates reduction highly depends on environmental geochemical conditions and bacterial activity [41] Insert Figure 1.PNG here: Conceptual model illustrating sediments genesis Insert Table 1 here Insert Table 2 here…”

Section: Main Sediments Characteristicsmentioning

confidence: 99%

Stabilization/solidification of sediments: challenges and novelties

Elghali¹,

Benzaazoua

Couvidat

et al. 2022

Low Carbon Stabilization and Solidification of Hazardous Wastes

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Section: Main Sediments Characteristicsmentioning

confidence: 99%

Stabilization/solidification of sediments: challenges and novelties

Elghali¹,

Benzaazoua

Couvidat

et al. 2022

Low Carbon Stabilization and Solidification of Hazardous Wastes

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“…Indeed, this conditioning is to avoid any reactivity of the sediment that comes from an anoxic environment. Sulfides content and organic matter are very instable and may oxidize quickly if exposed to air (Couvidat et al, 2016b). The preservation method was inspired from what recommended during sulfides mine waste handling (Benzaazoua et al, 1999).…”

Section: Sampling Storage and Treatmentmentioning

confidence: 99%

“…Sulfides within sediments are often not solely crystallized and other forms of reduced sulfur exist, which considerably induce microbiological activity and metals mobility (Chatain et al, 2013b;Couvidat et al, 2016b). The acid volatile sulfides (AVS) method consists of the generation of H 2 S from acid-sensitive sulfides by the addition of HCl while stirring for 60 min, with a solution-sediment ratio of 1:10 (5 g of sample in 500 mL of 1 N HCl), and to absorb the producing gas into 10 mL of a Sulfide Anti-Oxidant Buffer (SAOB) solution, to be towards analyzed for soluble sulfides (Brouwer and Murphy, 1994;Leonard et al, 1996;Rickard and Morse, 2005).…”

Section: Physicochemical Parametersmentioning

confidence: 99%

Characterization of how contaminants arise in a dredged marine sediment and analysis of the effect of natural weathering

Couvidat

Chatain

Bouzahzah

et al. 2018

Science of The Total Environment

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Millions of tons of contaminated sediments are dredged each year from the main harbors in France. When removed from water, these sediments are very reactive, therefore their geochemical behavior must be understood in order to avoid dispersion of contaminated lixiviates in the surrounding soils. In this objective, it is necessary to evaluate the principal physicochemical parameters, and also achieve advanced mineralogical characterization. These studied sediments are highly contaminated by metals, notably copper (1445 and 835mg/kg, in the unweathered and naturally-weathered sediments, respectively), lead (760 and 1260mg/kg, respectively), zinc (2085 and 2550mg/kg, respectively), as well as by organic contaminants (PAH, PCB) and organometallics (organotins). A high concentration of sulfide minerals was also observed both in the unweathered sediment preserved under water (3.4wt% of pyrite especially), and in the naturally weathered sediment (2wt% pyrite), and in particular framboïdal pyrite was observed in the two materials. The presence of reactive mineral species in the naturally-weathered sediment can be explained by the deposit of a protective layer, composed of sulfide and their oxidation products (sulfate and iron oxides), thus preventing oxygen from diffusing through to the sulfide minerals. Additionally, the presence of aluminosilicates aggregates coating the sulfide minerals could also explain their presence in the naturally-weathered sediment. As organic matter is one of the principal constituents of the sediments (5.8 and 6.3wt% total organic carbon in the unweathered and weathered sediment, respectively), the aggregates are probably partially constituted of refractory humic material. It therefore appears that the natural weathering has led to a significant decrease in PAHs and organotins, but not in PCBs. The evolution of the granulometric structure and the distribution of the metallic contaminants could therefore lead us to consider a treatment by size separation, and a possible valorization of the dredged sediments in civil engineering.

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Analysis of accumulation formation of sediment contamination in reservoirs after decades of running: a case study of nitrogen accumulation in Biliuhe Reservoir

Wang

Liu

2018

Environ Sci Pollut Res

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Sediment contamination is an important influencing factor for reservoir water quality. Investigations have shown that reservoirs are facing the risk of sediment contamination after running for several decades in China. This paper proposes that the accumulation of sediment contaminant is resulted from the difference between the input and output of contaminant. Further, an accumulation model of reservoir sediment nitrogen is established based on this theory. The calculation result of Biliuhe Reservoir shows that inflow rate of total nitrogen into the reservoir is 4521.47 t/a, the outflow rate is 1033.97 t/a, nitrogen removal by denitrification is 1465.81 t/a, and the accumulation rate is 1841.68 t/a. The accumulation rate of total nitrogen is 77.84 t/a in water, 924.42 t/a in suspended solids, and 839.42 t/a in sediment. The accumulation of nitrogen resulted in the total nitrogen concentration in water increasing from 1.71 mg/L in 1995 to 3.78 mg/L in 2013, and that in sediment increasing from 779.10 mg/kg in 1993 to 2725.00 mg/kg in 2013. It is concluded that sediment contamination has the characteristics of significant accumulation trend, complex forms, and high security risks, which has been a hidden security risk for reservoirs after decades of running. Heterogeneity of the reservoir and complicated influencing factors of sediment contaminant accumulation should be concerned next.

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Evaluation of biogeochemical reactivity of fresh and weathered contaminated dredged sediments

Cited by 4 publications

References 40 publications

Stabilization/solidification of sediments: challenges and novelties

Stabilization/solidification of sediments: challenges and novelties

Characterization of how contaminants arise in a dredged marine sediment and analysis of the effect of natural weathering

Analysis of accumulation formation of sediment contamination in reservoirs after decades of running: a case study of nitrogen accumulation in Biliuhe Reservoir

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