Zero-valent iron (Fe0)-based permeable reactive barrier treatment has been generating great interest for passive groundwater remediation, yet few studies have paid particular attention to the microbial activity and characteristics within and in the vicinity of the Fe0-barrier matrix. The present study was undertaken to evaluate the microbial population and community composition in the reducing ...

The (110) facets of hematite have excellent adsorption performance for chromium. We aim to obtain with a large specific surface area and exposed by using natural needle-like goethite as the precursor. derived shows significant increment in removal capacity chromium six times compared under same experimental conditions. Structural model fitting extended X-ray absorption fine structure (EXAFS) sp...

The development of low-operational-cost and low-operational-complexity active sulphate (SO4) reducing bioremediation for Acid Mine Drainage (AMD) is an ongoing pursuit towards sustainable mining. This study introduces a fixed bed pervious concrete anaerobic bioreactor as second stage AMD remediation process. investigated the pH self-regulation capabilities, SO4 capabilities rate limiting parame...

Abstract In this study, the purification effect of red mud–loess mixture (RM–L) as a reactive medium in permeable barrier (PRB) for groundwater contaminated by acidic wastewater (AW) containing Mn(II) was explored considering removal capacity and pH value, safety on RM–L after evaluated. The breakthrough parameters were determined purifying performances toward AW evaluated fixed-bed column test...

[continued on page 2] The South Carolina Department of Health and Environmental Control (SCDHEC) recently completed a field-scale pilot study on the use of an in-situ sulfate-reducing bioreactor/ permeable reactive barrier (SRBR/PRB) to address metals contamination in ground water at the Stoller Chemical Site in Jericho, SC. The SRBR/PRB contains common biomaterial such as coastal hay, woodchip...

Plant cell growth and stress signaling require Ca²⁺ influx through plasma membrane transport proteins that are regulated by reactive oxygen species. In root cell growth, adaptation to salinity stress, and stomatal closure, such proteins operate downstream of the plasma membrane NADPH oxidases that produce extracellular superoxide anion, a reactive oxygen species that is readily converted to ext...

At the Hanford Site, an extensive In Situ Redox Manipulation (ISRM) permeable reactive barrier was installed to prevent chromate from reaching the Columbia River. However, chromium has been detected in several wells, indicating a premature loss of the reductive capacity in the aquifer. Laboratory experiments have been conducted to investigate whether barrier reductive capacity can be enhanced b...

Laboratory and modeling studies were conducted to assess the potential performance of a permeable reactive barrier constructed of a natural zeolite material at the West Valley Demonstration Project in western New York State. The results of laboratory column tests indicated that the barrier material would be effective at removing strontium from groundwater under natural gradient conditions. Two ...

By performing density functional theory (DFT)-based calculations, the performance of α-silicene as oxidation-resistant coating on Ag(111) surface is investigated. First of all, it is shown that the Ag(111) surface is quite reactive against O atoms and O2 molecules. It is known that when single-layer silicene is formed on the Ag(111) surface, the 3 × 3-reconstructed phase, α-silicene, is the gro...