Hazardous contaminants in water and biomass fly ash spillage are causes for environmental and health concern. We selected five fly ashes generated from olive-mill (O,P, G and H) and greenhouse vegetable (I) waste used as biomass fuel in order to quantify their capacity to remove diuron and 3,4-dichloroaniline (DCA) from water. To understand the sorption processes involved, four kinetic models and two adsorption isotherms were assayed. The pseudo second-order kinetic showed the best fit (R>0.99). The initial adsorption rate constant was found to be faster for DCA than for diuron. The Freundlich adsorption constants of ashes O, P, G and H for diuron were more than 2-fold higher than for DCA (Kf=109-16μggmL). The alkaline pH of these fly ashes plays an important role in the adsorption process. Sorption/desorption processes were significantly affected by iron oxide content. DCA sorption was also influenced by particle size and carbon content. Low hysteresis coefficient values (H=0.01-0.26) revealed an irreversible sorption process. The study presents novel information on the immobilization of hazardous chemicals in water by biomass fly ashes generated from olive-oil industry and greenhouse crop waste.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jhazmat.2017.02.047 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Degradation of dioxins in chelated municipal solid waste incineration fly ash by low-temperature pyrolysis.
Chemosphere
November 2024
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China; Qingshanhu Energy Research Center Zhejiang University, Hangzhou, 311305, China.
In this study, low-temperature pyrolysis is applied to raw and chelated municipal solid waste incinerator fly ash to degrade and remove PCDD/F (polychlorinated dibenzo-p-dioxins, and dibenzofurans) and corresponding I-TEQs (international toxic equivalents), respectively. Additionally, PCDD/F degradation pathways are identified based on PCDD/F signatures. From the analysis of the average signal intensity of dioxin isomers in thermally treated fly ashes, the PCDD/F degradation rate was between 89.
View Article and Find Full Text PDFSystematic characterization of selenium speciation in coal fly ash.
Environ Sci Process Impacts
December 2024
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Dr, Atlanta, Georgia 30332, USA.
Millions of tons of coal fly ashes (CFAs) are produced annually during coal combustion in the U.S., which are commonly beneficially used in the concrete industry or disposed of in ash ponds.
View Article and Find Full Text PDFEffects of alkaline extraction on behavior of rare earth elements in coal ashes.
Environ Sci Pollut Res Int
November 2024
Mineral Processing & Metallurgy Research Center, Resources Utilization Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahak-Ro, Yuesong-Gu, Daejeon, 34132, Republic of Korea.
The effects of alkaline extraction on the behavior of rare earth elements in coal ashes were investigated in the present study. Independent variables are the concentration of extractant and particle size of coal ashes. Sodium hydroxide was used as an extractant, and the molarity of the solvents varied from 1.
View Article and Find Full Text PDFOptimizing phosphorus precipitation from acidic sewage sludge ash leachate: Use of Mg-rich mining by-products for enhanced nutrient recovery.
J Environ Manage
November 2024
Politecnico di Milano, Department of Civil and Environmental Engineering (DICA) - Environmental Section, Piazza Leonardo da Vinci 32, 20133, Milano, Italy. Electronic address:
Phosphorus recovery from Sewage Sludge Ashes (SSA) by wet chemical extraction followed by selective precipitation has gained great attention in recent years, attempting to reduce the anthropic pressure on natural reserves. This study investigates the selective precipitation process at lab- and small pilot-scales by means of two conventional and one innovative precipitating agents, the latter derived from a low-grade magnesium oxide mining by-product (LG-MgO named PC8), assessing the role of the most relevant operating parameters. Lab-scale experiments were performed on leachates obtained from bottom and fly ashes, in which several operating conditions were tested, differing in the type of precipitating agent, target pH and nutrient molar ratio.
View Article and Find Full Text PDFSynchrotron-aided exploration of REE recovery from coal fly ashes within a Canadian context.
Chemosphere
November 2024
Canadian Light Source, Saskatoon, Saskatchewan, S7N 2 V3, Canada.
Coal ashes in Canada have gained attention as a potential source for recovering rare earth elements (REE) from industrial waste. However, the complex chemical properties of coal ashes have made it difficult to determine the desirability, feasibility, and viability of REE recovery. To address this issue, this study systematically investigated distribution and structural information, speciation and chemical-binding state, and purity and extraction capacity of REE in multiple Canadian coal ashes (i.
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!