The feasibility of using bentonite, illite, and zeolite as capping materials to stabilize nutrients and interrupt their release from contaminated lake sediments

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

doi:10.1016/j.chemosphere.2018.12.021

Cited by 55 publications

(18 citation statements)

References 37 publications

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“…DO concentrations in the case of ZL/NWFM capping at same temperature were higher than those in uncapped and AC/NWFM capping conditions, indicating that ZL/NWFM capping delayed the consumption of DO in the overlying water. This result can be explained by that organic matter and NH 4 + , which consume DO in overlying water through nitrification, was effectively captured by ZL 22 . The ORP (Eh) decreased during the early stage of the experiment, and thereupon continuously increased to ~−4.2 mV or ~−45.9 mV, depending on the capping condition.…”

Section: Resultsmentioning

confidence: 92%

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: 92%

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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“…They found that the biochar in the cap adsorbed nitrogen from the porewater, chemically blocked nitrogen diffusion from the impacted sediments and led to increased redox potential. Gu, Hong, Lee, and Park (2019) evaluated the use of illite, bentonite, and zeolite in sediment caps. Results indicated that zeolite and illite were promising cap amendments to address nitrogen‐ and P‐based chemicals, respectively.…”

Section: Remediationmentioning

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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“…However, some efforts to control inputs of external nutrients (e.g., by controlling the direct discharge of domestic sewage, industrial wastewater and agricultural sewage) do not fundamentally solve the problem. Because sediment plays the role of a nutrient sink and source, it releases nutrients to the water column when relevant environmental factors change (Søndergaard et al 2003;Gu et al 2019;Lee et al 2019). For example, the release of P is affected by temperature and levels of dissolved oxygen (Jiang et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and risks of joint control of nitrogen and phosphorus through sediment capping technology in a pilot-scale study

et al. 2021

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Purpose Nitrogen (N) and phosphorus (P) are the key elements leading to eutrophication, and it is important to jointly control N and P release from sediments into the water column. Methods Different mixed materials including P sorbent, natural organic carbon (C), and an oxidizing agent were applied in a 1-year pilot-scale experiment. Results The addition of iron-rich (IR) clay and Phoslock agent promoted the formation of iron bound P (Fe(OOH)~P) and calcium bound P (CaCO 3~P ) in sediments, respectively. IR clay offered more advantages in immobilization of phosphorus as refractory P, and the Phoslock agent more effectively reduced the risk of P release into water, which was expressed as a low equilibrium P concentration (EPC 0 ). Mixtures of sugarcane (SU) detritus and IR clay exhibited high carbohydrate (CHO) contents, which further fuelled both denitrification and dissimilatory nitrate reduction to ammonium (DNRA). This indicated that the SU dosage should be controlled to avoid DNRA over denitrification. Attention should be given to the fact that SU introduction significantly promoted the generation of an anaerobic state, leading to the desorption and release of Fe(OOH)~P, which could be alleviated by using Oxone. Multienzyme activity analysis showed that P and N transformation shifted from P desorption to organic P hydrolysis and from ammonification to denitrification and DNRA, respectively. Conclusion We recommend the use of P sorbent and organic C combined with oxidizing agents as effective mixed materials for sediment remediation, which could enhance P adsorption and provide electron donors for denitrification, while also avoiding the generation of anoxia.

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The feasibility of using bentonite, illite, and zeolite as capping materials to stabilize nutrients and interrupt their release from contaminated lake sediments

Cited by 55 publications

References 37 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 aquatic sediments

Mechanisms and risks of joint control of nitrogen and phosphorus through sediment capping technology in a pilot-scale study

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