Sand filters devised with iron-rich adsorbents are extensively promoted and deployed in the arsenic-prone south and south-east Asian countries (e.g., Bangladesh). The approach offers superior performance in removing arsenic while the spent sludge from the sand filters is an issue of concern due to the possibility of toxic releases after being discarded. In this work, a new technique is proposed for the treatment of spent iron-oxide coated sand (IOCS) from filters used in arsenic removal. Chelant-washing of the arsenic-loaded IOCS is combined with the solid phase extraction treatment to accomplish the objective. The unique point of the proposed process is the cost-effective scheme, which includes the option of recycling of the washing solvent beside the decontamination of the spent arsenic-rich sludge.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.chemosphere.2013.03.024 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Regulating gypsum scaling-induced wetting in membrane distillation by heterogeneous crystallization: Role of filter media.
Water Res
January 2025
Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA.
Mineral scaling and scaling-induced wetting are critical issues in membrane distillation (MD) during treatment of saline wastewaters. Gypsum scaling and scaling-induced wetting in MD were successfully regulated by heterogeneous crystallization with in-line granular filtration in this study. Stable water recovery increased from 32.
View Article and Find Full Text PDFSlow sand filters with variable filtration rates for rainwater purification: Microecological differences between biofilm and water phases.
J Environ Manage
January 2025
China Architecture Design and Research Group, Beijing, 100044, PR China; Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, PR China.
Slow sand filters (SSFs) have been increasingly applied to rainwater purification in recent years, but the response of SSFs to fluctuating rainfall, as well as the biofilm- and water-phase microecology in SSFs are still poorly understood. This study systematically evaluated the rainwater purification performance of SSFs and compared the bacterial community structure, assembly processes and molecular ecological interactions between the biofilm and water phases. The activated carbon and activated alumina filters exhibited the best performance for NH-N (18.
View Article and Find Full Text PDFAdsorption adaptive response exposed to algal organic matter: correlation to the characteristics of granular activated carbon.
Environ Technol
January 2025
College of Architecture & Civil Engineering, Beijing University of Technology, Beijing, People's Republic of China.
The release of algal organic matter (AOM) during seasonal algal blooms increases the complexity and heterogeneity of natural organic matter (NOM) in water sources, altering its hydrophilic-hydrophobic balance and posing significant challenges to conventional water treatment processes. This study aims to verify whether the (Granular activated carbon) GAC selected for the adsorption of NOM in sand filtration effluent can adapt to water quality fluctuations caused by AOM release, and identify the criteria influencing GAC adsorption performance. Results indicated that external surface area, mesopore volume, pore size and surface functional groups were key indicators of GAC adsorption performance.
View Article and Find Full Text PDF[Solid-phase extraction coupled with high performance liquid chromatography-triple quadrupole mass spectrometry for simultaneous determination of seven coumarins in water samples from drinking water treatment plants].
Se Pu
January 2025
School of Public Health, Nanjing Medical University, Nanjing 211166, China.
Chlorinated coumarins, which are as cytotoxic as highly toxic halobenzoquinones toward CHO-K1 cells, have recently been identified as disinfection byproducts in drinking water disinfection processes. Therefore, detecting coumarins in water samples collected at various stages from drinking water treatment plants helps assess the formation of chlorinated coumarins in drinking water. Hence, a simple, rapid, accurate, and sensitive method for quantifying coumarins in water samples is required.
View Article and Find Full Text PDFInfluence of Surface Wettability of Nonhomogeneous Proppant on Hydraulic Fracture Inflow Performance.
Langmuir
December 2024
School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, China.
Quartz sand proppant is widely used in hydraulic fracturing and the extraction of low-permeability reservoirs to prevent fracture closure and enhance reservoir recovery effectively. The influence of proppant size and type on well productivity has been widely studied, but the mechanism of proppant surface wettability on the hydraulic fracture inflow performance has not been thoroughly investigated. To further understand the influence of proppant wettability on fracture inflow performance, in this work, a hydrophobic quartz sand proppant was prepared by a simple dip-coating method using silane solution with a static water contact angle of 136.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!