Evaluation of sediment capping with activated carbon and nonwoven fabric mat to interrupt nutrient release from lake sediments

Gu, Bon-Wun; Lee, Changgu; Lee, Taegu; Park, Seong‐Jik

doi:10.1016/j.scitotenv.2017.04.212

Cited by 49 publications

(26 citation statements)

References 48 publications

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“…The increase in pH with the AC/NWFM capping can be explained primarily by the formation of alkaline ash during the manufacturing process. Inorganic materials such as Ca, Na, and K in the raw AC material are altered into Ca(OH) 2 , NaOH, and KOH, respectively, by reacting with O 2 and H 2 O during the activation process 20 . Higher temperatures enhance the elution of such alkaline elements of AC into the overlying water, which results in the increase of pH with temperature for AC/NWFM capping.…”

Section: Resultsmentioning

confidence: 99%

“…Along with zeolite, active carbon has been widely used as capping material, especially for sequestrating organic contaminants. Activated carbon has many advantages as capping material, such as huge specific surface area for binding contaminants, less public concern for its application, and proof-of-concept of its use in many studies 20,21 . In our previous study 20 , the use of non-woven fabric mats with activated carbon prevented the loss of activated carbon by flotation and external forces, which proved to be more effective in sequestrating N and P than the use of activated carbon alone.…”

Section: Introductionmentioning

confidence: 99%

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Effect of temperature on capping efficiency of zeolite and activated carbon under fabric mats for interrupting nutrient release from sediments

Hong

Lee

et al. 2019

Sci Rep

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We investigated the influence of temperature on the capping efficiency to interrupt the release of nutrients from lake sediments. A 3-cm layer of Zeolite (ZL) or activated carbon (AC) was placed on the contaminated sediments, and nonwoven fabric mats (NWFM) were placed on top of these capping materials. Laboratory incubation experiments were performed under three different temperatures, namely 4, 15, and 30 °C. Under the uncapped condition at 30 °C, dissolved oxygen (DO) was depleted after 30 days, while at 4 °C and 15 °C, DO was present until the end of this experiment. DO concentration in overlying water was more dependent on the temperature than capping condition. ZL/NWFM effectively blocked the release of N from the sediments, and the capping efficiencies of ZL/NWFM for NH4-N at 4, 15, and 30 °C were 98%, 96%, and 94%, respectively. For the interruption of P release, both ZL/NWFM and AC/NWFM were not effective at 4 and 15 °C. At 30 °C, however, AC/NWFM was effective, and its capping efficiencies at 30 °C for PO4-P and T-P were 74.0% and 79.9%, respectively. In summary, nutrient release from sediments was accelerated at higher temperatures, and the effect of capping was significant at high temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of temperature on capping efficiency of zeolite and activated carbon under fabric mats for interrupting nutrient release from sediments

Hong

Lee

et al. 2019

Sci Rep

Self Cite

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“…Thin-layer capping and amendment with active materials are regarded as nondestructive and low-impact measures. Non-woven fabric mats (NWFM) were placed on top of a layer of activated carbon (laboratory column incubation experiments) to investigate the efficiency of blocking nutrients (nitrogen, phosphorous) (Gu, Lee et al 2017). The capping efficiencies for NH4-N, T-N and PO4-P with NWFM/AC capping was 66.0, 54.2 and 73.1% respectively.…”

Section: Activated Carbonmentioning

confidence: 99%

“…For T-P, capping efficiencies under all capping conditions were almost 100%. Overall, placing the NWFM above the AC can be successfully used for remediation of lake sediments with high amounts of nitrogen and phosphorous (Gu, Lee et al 2017).…”

Section: Activated Carbonmentioning

confidence: 99%

Contaminated Sediments

Olsen¹,

Petersen²,

Lehoux³

et al. 2019

TemaNord

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“…Sediment capping has been shown to be a more effective, economic, and durable in-situ 35 treatment to stabilize and remediate contaminated subaqueous sediments in lakes or rivers 36 compared to ex-situ methods such as dredging (Locate et al 2003;Reible et al 2003Reible et al , 2006Yuan 37 et al 2007Yuan 37 et al , 2009Olsta 2010;Perelo 2010;Eun et al 2012a,b;Ebrahimi et al 2014Ebrahimi et al , 2016Zhang 38 et al 2016;Gu et al 2017). From 1990 to 2006, approximately six million cubic meters of 39 contaminated sediment have been removed and disposed of through the implementation of 71 40 major environmental remediation projects in the United States (Zeller and Cushing 2006).…”

Section: Introductionmentioning

confidence: 99%

Assessment of approaches to obtain ebullition pressures for organophilic clay blankets

Eun

McCartney

Znidarčić

2019

Geosynthetics International

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The objective of this study is to compare two experimental approaches to characterize the ebullition pressure (or air-entry suction) of initially water-saturated organophilic clay blankets. The first is an indirect approach using the water-retention curve (WRC) and the second is a direct approach using ebullition experiments. The WRC along with the hydraulic conductivity of organophilic clay blankets in saturated and unsaturated conditions were measured using a flexiblewall permeameter with suction-saturation control. This device was also adapted to measure the ebullition pressure and the air permeability. The comparison of the experimental approaches was performed on organophilic clay blanket specimens in different initial conditions (unrinsed and rinsed to remove loose fines) under high and low effective confining stresses (20 and 5 kPa). The indirect estimates of air-entry suction from the WRC were similar to those obtained from the ebullition tests. This good agreement between the two approaches may add flexibility to the development of design specifications for capping systems. The hydraulic properties were found to be sensitive to rinsing and effective stress, with greater hydraulic conductivity and air permeability for the rinsed specimen due to the removal of fines, and greater air-entry suctions for specimens under higher effective stress.

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Evaluation of sediment capping with activated carbon and nonwoven fabric mat to interrupt nutrient release from lake sediments

Cited by 49 publications

References 48 publications

Effect of temperature on capping efficiency of zeolite and activated carbon under fabric mats for interrupting nutrient release from sediments

Effect of temperature on capping efficiency of zeolite and activated carbon under fabric mats for interrupting nutrient release from sediments

Contaminated Sediments

Assessment of approaches to obtain ebullition pressures for organophilic clay blankets

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