Effects on the migration and speciation of heavy metals by combined capping and biochemical oxidation during sediment remediation

Lin, Jin‐Ming; Liu, Mengling; Zhuang, Sunling; Geng, Bo; Wang, Xiaodi; Ma, Jiasheng; Chen, Musong

doi:10.1016/j.scitotenv.2023.162055

Cited by 7 publications

(1 citation statement)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the oxidation of CN with the sediments was incomplete on the 8th day, and the location of CN injection and DGT placement might have caused the uneven distribution of sulfur and incomplete removal. Previous studies had shown that, after complete oxidation, the removal rate of DGT-labile sulfide flux by LMB+CN was equivalent to that of CN alone [33].…”

Section: Variations In Dgt-labile Sulfide Flux In the Sediment-water ...mentioning

confidence: 92%

Effect of Combined Application of Lanthanum-Based Capping Material and Biochemical Oxidant on Control of Internal Phosphorus

Liu,

Geng,

et al. 2024

Water

Self Cite

View full text Add to dashboard Cite

In situ capping and biochemical oxidation are two of the most commonly used methods for internal phosphorus (P) control, but there are few studies on the combined use of these two methods. In this study, two lanthanum (La)-based materials, La-modified bentonite (LMB) and the La-modified attapulgite and chitosan composite (LMA&C), were combined with calcium nitrate (CN) to investigate the effect on sediment P control. Results showed that SRP removal rates by LMB+CN and LMA&C+CN were much higher than that by LMB, LMA&C and CN alone. LMB+CN and LMA&C+CN decreased DGT-labile P flux both in overlying water and surface 65 mm sediment, while LMB and LMA&C had an effect only on overlying water and surface 10~40 mm sediment, and CN was effective only on sediments. LMB and LMA&C transformed NH4Cl-P, BD-P, NaOH-SRP and NaOH-NRP in surface 20 mm sediment to HCl-P and Residual-P on day 60. CN transformed NaOH-SRP and NaOH-NRP to BD-P, resulting in the increase in NH4Cl-P. LMB+CN and LMA&C+CN sequestered P in the surface 20 mm mainly as HCl-P and Residual-P, and mainly as BD-P in −20~−60 mm. Results indicate that the combination of capping by La-based material and oxidation by CN is a promising method for sediment P control.

show abstract

Section: Variations In Dgt-labile Sulfide Flux In the Sediment-water ...mentioning

confidence: 92%