Managing contaminated sediments

Jacobs, Patrick; Förstner, Ulrich

doi:10.1007/bf02987726

Cited by 23 publications

(4 citation statements)

References 8 publications

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“…However, changes in chemical conditions (i.e., pH value or reduction-oxidation potential) can result in partial re-dissolution of the bound metal(loid)s, and thus, sediments can act also as secondary sources of pollution (Simpson et al, 2000;Zoumis et al, 2001). In addition, hydrological factors affect the dynamics of metal(loid) stability in the sediments; for instance, bioturbation caused by benthic organisms, advection, diffusion, or underflows can result in metal(loid) re-suspension (Jacobs and Förstner, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The modelling of metal(loid), methyl mercury, and cyanide release from active capping has demonstrated that the method is effective for at least 100 years (Viana et al, 2008). Active capping materials have several advantages over inert caps: a thinner layer is typically required, and thus, less disturbance is caused to benthic fauna; adsorbents can be introduced as a permeable granule bed, which does not form a hydraulic barrier for water flow; and the costs can be lower compared to dredging (Ghosh et al, 2011;Jacobs and Förstner, 2001;Zhang et al, 2016). However, passive capping is a more mature technology (Azcue et al, 1998), whereas, only a few pilot-scale experiments have been reported in the scientific literature with active capping (Knox et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Geopolymers as active capping materials for in situ remediation of metal(loid)-contaminated lake sediments

Kutuniva

Mäkinen

Kauppila

et al. 2019

Journal of Environmental Chemical Engineering

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Metal(loid) contamination in sediments is a widespread environmental issue. Sediments act normally as metal(loid) sinks, but if chemical conditions (such as pH or redox potential) change, they can become sources of secondary pollution. Consequently, various strategies for both in and ex situ remediation of contaminated sediments have been developed. One promising method is active capping, which involves the injection of adsorbents as a layer on the sediment surface or the mixing of adsorbents within the sediment. Adsorbents decrease the bioavailability of metal(loid)s.In the present work, the suitability of alkali-activated blast-furnace-slag, metakaolin geopolymer, and exfoliated vermiculite were evaluated for in situ stabilization of two metal(loid)-contaminated lake sediments through laboratory-scale experiments. The results indicated that adsorbent 2 amendments had metal(loid)-specific performance: alkali-activated blast-furnace slag was suitable for Al, Cu, Fe, and Ni; metakaolin geopolymer for Cu, Cr (total), and Fe; and vermiculite for Al and Zn. None of the materials could stabilize Ba, Sr, or Ti. Furthermore, the amendments performed differently in two different lake sediments, implying that the effectiveness of the amendments needs to be confirmed on a case-by-case basis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geopolymers as active capping materials for in situ remediation of metal(loid)-contaminated lake sediments

Kutuniva

Mäkinen

Kauppila

et al. 2019

Journal of Environmental Chemical Engineering

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“…Contaminants may be released under changing physicochemical conditions and pollute water, plants, and livestock. Currently, polluted dredged sediment is mainly disposed of in landfills or underwater sites (1). However, landfilling polluted sediment has several disadvantages and cannot be regarded as a longterm solution (2).…”

Section: Introductionmentioning

confidence: 99%

Bioremediation Process for Sediments Contaminated by Heavy Metals: Feasibility Study on a Pilot Scale

Seidel

Löser

Zehnsdorf

et al. 2004

Environ. Sci. Technol.

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The core stages of a sediment remediation process--the conditioning of dredged sludge by plants and the solid-bed leaching of heavy metals using microbially produced sulfuric acid--were tested on a pilot scale using a highly polluted river sediment. Conditioning was performed in 50 m3 basins at sludge depths of 1.8 m. During one vegetation period the anoxic sludge turned into a soil-like oxic material and became very permeable to water. Reed canary grass (Phalaris arundinacea) was found to be best suited for conditioning. Bioleaching was carried out in an aerated solid-bed reactor of 2000 L working volume using oxic soil-like sediment supplemented with 2% sulfur. When applying conditioned sediment, the oxidation of easily degradable organic matter by heterotrophic microbes increased the temperature up to 50 degrees C in the early leaching phase, which in turn temporarily inhibited the sulfur-oxidizing bacteria. Nevertheless, most of the metal contaminants were leached within 21 days. Zn, Cd, Mn, Co, and Ni were removed by 61-81%, Cu was reduced by 21%, while Cr and Pb were nearly immobile. A cost-effectiveness assessment of the remediation process indicates it to be a suitable treatment for restoring polluted sediments for beneficial use.

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“…The multiple sources of contamination within a water basin result in a mixture of contaminants more difficult to treat than industrial wastes (Jacobs & Förstner 2001 (Kronvang et al 2003). In addition, in some cases of sediments originating from agricultural areas, the nutrients concentration can be very high which can cause eutrophication of the waterways (Carpenter 2005), especially when the sediments are re-suspended when dredging (Lohrer & Wetz 2003).…”

Section: Constraints To the Beneficial Use Of Sediments To Reverse Lamentioning

confidence: 99%

Lift up of Lowlands : beneficial use of dredged sediments to reverse land subsidence

Oliveira¹

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Managing contaminated sediments

Cited by 23 publications

References 8 publications

Geopolymers as active capping materials for in situ remediation of metal(loid)-contaminated lake sediments

Geopolymers as active capping materials for in situ remediation of metal(loid)-contaminated lake sediments

Bioremediation Process for Sediments Contaminated by Heavy Metals: Feasibility Study on a Pilot Scale

Lift up of Lowlands : beneficial use of dredged sediments to reverse land subsidence

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