Comparison of capping and mixing of calcined dolomite and zeolite for interrupting the release of nutrients from contaminated lake sediment

Alvarado, J.; Hong, Seunghee; Lee, Changgu; Park, Seong‐Jik

doi:10.1007/s11356-020-08058-y

Cited by 14 publications

(7 citation statements)

References 72 publications

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“…Although the pH of UN-CAP was maintained at pH 7.7, the pHs of overlying-water under CRCMs capping conditions were observed higher than that of UN-CAP. The pH increase under the capping condition was due to the alkaline nature of the capping materials: the dissolution of Ca 2+ from CRCMs increases the pH of the overlying water as Ca is a base cation (Alvarado et al 2020;McBride 1994). The decrease in pH under capping conditions from day 28 to day 70 indicates that the potential toxic effect associated with pH decreases over time.…”

Section: Properties Of River Water and Sedimentsmentioning

confidence: 99%

Application of Calcium-rich Clay Mineral Under Nonwoven Fabric Mats and Sand Armor as Cap Layer for Interrupting N and P Release from River Sediments

Hong

Lee

Park

2022

Preprint

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This work investigates the applicability of thermally treated calcium-rich clay minerals (CRCMs), such as sepiolite (SPL), attapulgite (ATT), and dolomite (DLM) to hinder the nitrogen (N) and phosphorus (P) release from river sediments. A non-woven fabric mat (NWFM) or a sand layer were also capped as armor layers, i.e., placed over CRCMs to investigate the capping impact on the N/P release. The capping efficiency was evaluated in a cylindrical reactor, consisting of CRCMs, armor layers, sediments, and sampled water. We monitored N/P concentrations, dissolved oxygen (DO), oxidation reduction potential, pH, and electric conductivity in overlying water over 70 days. The DO concentrations in the uncapped and capped conditions were preserved for 30 days and 70 days (until the end of experiment duration), respectively. ATT showed higher efficiency for NH4-N and T-N than the other two materials, and the capping efficiency of NH4-N was measured as 96.4%, 93.7%, and 61.6% when capped with 2 cm sand layer, 1 cm sand layer, and NWFM layer, respectively. DLM showed a superior rejection capability of PO4-P to ATT and SPL, reported as 97.2% when capped with 2 cm sand armor. The content of weakly adsorbed-P was lower in the uncapped condition than in the capping condition. It can be concluded that ATT and DLM can be used as capping agents to deactivate N and P, respectively, to reduce water contamination from sediments of the eutrophic river.

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Section: Properties Of River Water and Sedimentsmentioning

confidence: 99%

Application of Calcium-rich Clay Mineral Under Nonwoven Fabric Mats and Sand Armor as Cap Layer for Interrupting N and P Release from River Sediments

Hong

Lee

Park

2022

Preprint

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“…al., (2018) demonstrated that the efficiency of sediment capping using active thin-layer capping with natural zeolite with 2 cm thickness, resulted in the inhibition of NH4 + and PO4 3-. Zeolite was proven to be effective for interrupting the release of nitrogen (NH4-N, NO3-N) from contaminated lake sediment to the water (Alvarado et. al., 2020).…”

Section: Fig 2 Comparison Of Treatments Efficiency For Capping and Mi...mentioning

confidence: 99%

“…al., 2018;Gu et. al., 2019;Alvarado et. al., 2020) the methods for sediments contaminated remediation with NH4-N, NO3-N, PO4-P and heavy metals using bentonite and zeolite in lakes, fish farms and agricultural fields were differed in order to stabilize them and not release from sediments or soil to the water or to crops.…”

Section: Introductionmentioning

confidence: 99%

Use of Bentonite and Zeolite to Stabilize Nutrients and Heavy Metals Within Earthen Pond Sediments

Ali

2021

Journal of Soil Sciences and Agricultural Engineering

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Leaving out the sediments of earthen ponds for several years without disinfection or treatment leads to high concentrations of nitrogen and phosphate compounds, heavy metals and increasing sediment pollutants which release into the water. Therefore, this study aimed to evaluate the effectiveness of capping or mixing of bentonite and zeolite in different percentages for the stabilizing of nutrients and heavy metals in earthen pond sediments for interrupt their release to the water. The pH and electrical conductivity (EC), NH4-N, NO3-N, PO4-P and heavy metals (Cd, Cu, Fe, Mn, Ni, Pb and Zn) in the sediments were measured by 45-day laboratory incubation experiments. The results showed that the highest stabilization efficiency of NH4-N, NO3-N, Cd, Cu, Pb and Zn in the sediments was recorded with zeolite capping of 6% of the sediment weight (ZC 6%) by 65.4%, 41.8%, 66.0 %, 63.9 %, 54.2 % and 57.3 %, respectively, while, the highest stabilization efficiency of PO4-P, Fe, Mn and Ni was with bentonite capping of 6% of the sediment weight (BC 6%) by 61.9%, 42.7 %, 57.0 % and 52.6 %, respectively. Therefore, it is recommended to use bentonite or zeolite as capping material for sediment at a rate of 6% at the bottom of the pond can be effective for the control of nutrients and heavy metals when they are increased in earthen pond sediments for interrupt their release into water.

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“…To minimize the risk of metal(loid) re-dissolution, in situ remediation by active capping or sediment augmentation with adsorbents has been studied as a less disruptive and lower-cost option for dredging and off-site treatment (Zhang et al 2016). In augmentation, adsorbent material is mixed in the sediment (Alvarado et al 2020), while in active capping, adsorbent is applied on the sediment surface as a thin, normally few centimeter-thick layer with the aid of geotextiles (Viana et al 2008;Zhang et al 2016). In addition to adsorption and other sequestration mechanisms, active capping also provides physical and chemical isolation for the sediment and reduces the flux of dissolved contaminants into the overlying water column (Zhang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

In situ remediation of metal(loid)-contaminated lake sediments with alkali-activated blast furnace slag granule amendment: A field experiment

et al. 2022

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Purpose Adsorbent amendment to contaminated sediments is one in situ remediation method to decrease the bioaccessibility of pollutants from the sediments. In this work, alkali-activated blast furnace slag (BFS) granules were used in a field experiment at Lake Kivijärvi (Finland). The lake was heavily affected by a mining accident in 2012, which released a significant peak load of metals and sulfate. The purpose of this work was to evaluate the performance of the novel amendment material for in situ remediation in real conditions with a preliminary cost estimation. Methods Alkali-activated BFS granules were prepared and characterized for composition, microstructure, and surface properties. Two mesocosms were placed in the lake: one with granule dosing and another without. Sediment and pore water samples were collected after a two-week period. Similar small-scale experiment was performed in laboratory with a three-month duration. Bioaccessibility of metals from sediments was assessed with a three-stage leaching procedure. Results The granules were effective in decreasing the mobility of Fe, Zn, Ni, and Cr in all leaching stages by approximately 50–90% in comparison with unamended sediment in the mesocosm experiment. Laboratory-scale incubation experiments also indicated decreased release of Ba, Co, Ni, Al, Fe, Mg, Mn and S. The estimated material costs were lower than the removal of the contaminated sediments with dredging and off-site treatment. Conclusion The results showed preliminarily the effectiveness of alkaline-activated BFS in the remediation of metal-contaminated sediments in a field experiment. However, topics requiring further study are the leaching of trace elements from the material and impact on the sediment pH.

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Comparison of capping and mixing of calcined dolomite and zeolite for interrupting the release of nutrients from contaminated lake sediment

Cited by 14 publications

References 72 publications

Application of Calcium-rich Clay Mineral Under Nonwoven Fabric Mats and Sand Armor as Cap Layer for Interrupting N and P Release from River Sediments

Application of Calcium-rich Clay Mineral Under Nonwoven Fabric Mats and Sand Armor as Cap Layer for Interrupting N and P Release from River Sediments

Use of Bentonite and Zeolite to Stabilize Nutrients and Heavy Metals Within Earthen Pond Sediments

In situ remediation of metal(loid)-contaminated lake sediments with alkali-activated blast furnace slag granule amendment: A field experiment

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