Journal ArticleDOI
Extraction kinetics of heavy metal-containing sludge.
TLDR
Nitric acid was found to be more effective than citric acid to extract the heavy metals from the sludge and the extraction activation energies obtained in this study suggested that both a physical diffusion process and a chemical reaction process might play important roles in the overall extraction process.About:
This article is published in Journal of Hazardous Materials.The article was published on 2005-08-31. It has received 72 citations till now. The article focuses on the topics: Nitric acid & Citric acid.read more
Citations
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Journal ArticleDOI
The migration and transformation behavior of heavy metals during the liquefaction process of sewage sludge.
TL;DR: The results showed that the liquefaction solvent and temperature significantly affected the redistribution of HMs, and it was suggested that the bio-oil should be pretreated before utilization to promote a higher HM content in bio-oils.
Journal ArticleDOI
Hydrometallurgical extraction of zinc from Jordanian electric arc furnace dust
TL;DR: The highest zinc extraction was obtained at low acid concentration of less than 1 ǫmol/L in the order of H 2 SO 4 followed by HNO 3 and then HCl as discussed by the authors.
Journal ArticleDOI
Process investigation of the acid leaching of rare earth elements from phosphogypsum using HCl, HNO3, and H2SO4
TL;DR: In this article, the feasibility of acid leaching of rare earth elements (REEs) from phosphogypsum from both theoretical and practical standpoints was investigated from both practical and theoretical point of view.
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Factorial experimental design for recovering heavy metals from sludge with ion-exchange resin
TL;DR: Experimental results and statistical analysis show that a stronger leaching acid and a higher temperature both favor lower heavy metal residues in the sludge.
Journal ArticleDOI
Selective Leaching of Steelmaking Slag for Indirect CO2 Mineral Sequestration
Weijun Bao,Huiquan Li,Yi Zhang +2 more
TL;DR: In this paper, the acid-to-slag ratio of steelmaking slag was investigated using a novel leaching medium, which involves organic solvent tributyl phosphate (TBP), acetic acid, and ultrapure water.
References
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Book
Chemical Reaction Engineering
TL;DR: An overview of Chemical Reaction Engineering is presented, followed by an introduction to Reactor Design, and a discussion of the Dispersion Model.
Journal ArticleDOI
Advanced sludge treatment affects extracellular polymeric substances to improve activated sludge dewatering
TL;DR: From the experiments, it is concluded that AST methods enhance cake dewaterability in two ways: they degrade EPS proteins and polysaccharides reducing the EPS water retention properties; and they promote flocculation which reduces the amount of fine flocs.
Journal ArticleDOI
Heavy metal speciation and leaching behaviors in cement based solidified/stabilized waste materials.
TL;DR: The leaching of heavy metals in the S/S materials can be considered as a pH dependent and corresponding metal hydroxide solubility controlled process.
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Removal of heavy metals from sewage sludge by extraction with organic acids.
TL;DR: In this article, the authors studied the feasibility of heavy metal extraction from activated sludge plants and found that heavy metals can be extracted for 60-70% and Zn for 90-100% by citric acid at pH 3-4.
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Heavy metal adsorption by humic umbrisols: selectivity sequences and competitive sorption kinetics
TL;DR: This work examines sorption kinetics of Cd, Cr, Cu, Ni, Pb, and Zn adsorbed simultaneously by four humic umbrisols, as well as the influence of the soil components on the adsorption rate.