Journal ArticleDOI
Comparison of heavy metal removals from aqueous solutions by chemical precipitation and characteristics of precipitates
TLDR
In this article, the authors compared chemical precipitation methods using lime (Ca(OH)2), soda ash (Na2CO3) and sodium sulfide (Na 2S) for removals of heavy metals from aqueous solutions.Abstract:
Typical chemical precipitation methods using lime (Ca(OH)2), soda ash (Na2CO3) and sodium sulfide (Na2S) for removals of heavy metals (i.e. Zn (II), Cu (II) and Pb (II)) from aqueous solutions were compared by jar tests. A focus was especially given to particle size differences and chemical phase conversion of precipitates. A removal of 99.99% from aqueous solutions with three precipitants was achieved for copper and zinc at an initial concentration of 100 mg/L. And lead was efficiently removed (99.75%) by sodium sulfide. In contrast, the maximal lead removals with lime or soda ash precipitation were only 76.14% and 97.78%. The mean particle size of precipitates was in the range of 55 nm–45 μm, depending on properties of precipitants and heavy metal to precipitant ratios. The settling performance of the sludge derived from precipitation was dominated by particle size and Zeta-potential of precipitates. It was observed that ultra-fine copper sulfide particles resulted from the precipitation were around 55 nm and did not settle in 12 h due to electrostatic repulsion force between particles. The main compounds in the sludge obtained from precipitation were metal hydroxides and metal sulfides. However, spontaneous dehydration of metal hydroxide, oxidation of sulfide and atmospheric carbonation were identified by means of XRD and thermal analyses, which is invaluable to the disposal and utilization of the sludge.read more
Citations
More filters
Journal ArticleDOI
Heavy metal water pollution: A fresh look about hazards, novel and conventional remediation methods
Camilo Zamora-Ledezma,Daniela Negrete-Bolagay,Freddy Figueroa,Ezequiel Zamora-Ledezma,Ming Ni,Frank Alexis,Victor H. Guerrero +6 more
TL;DR: In this article, the authors discuss some of the most recent and relevant findings related to the release of heavy metals, the possible risks for the environment and human health, the materials and technologies available for their removal.
Journal ArticleDOI
Production and applications of activated carbons as adsorbents from olive stones
TL;DR: In this paper, the authors reviewed the research undertaken on the production and application of activated carbon as an adsorbent from olive stones for wastewater treatment, and the future prospects of these materials as adsorbents were discussed.
Journal ArticleDOI
Removal of heavy metals from aqueous solution using carbon-based adsorbents: A review
TL;DR: In this article, the effect of process conditions, such as temperature, pH value, and coexisting ions, on adsorption performance are combed, and the universal guidance law is obtained.
Journal ArticleDOI
A critical review of biosorption of dyes, heavy metals and metalloids from wastewater as an efficient and green process
TL;DR: In this article, a comprehensive understanding of the biosorption capability of different biosorbents is necessary to know how they can remove inorganic and organic contaminants in wastewater, thus bridging the gap between laboratory results and industrial use.
Journal ArticleDOI
Insight on water remediation application using magnetic nanomaterials and biosorbents
M. I. A. Abdel Maksoud,Ahmed M. Elgarahy,Charlie Farrell,Charlie Farrell,Ala’a H. Al-Muhtaseb,David Rooney,Ahmed I. Osman +6 more
TL;DR: A review of the state-of-the-art of magnetic nanomaterials and biosorbents for the removal of contaminants from wastewater streams can be found in this paper.
References
More filters
Journal ArticleDOI
Removal of heavy metal ions from wastewaters: A review
Fenglian Fu,Qi Wang +1 more
TL;DR: It is evident from the literature survey articles that ion-exchange, adsorption and membrane filtration are the most frequently studied for the treatment of heavy metal wastewater.
Journal ArticleDOI
Physico-chemical treatment techniques for wastewater laden with heavy metals
TL;DR: In this article, the technical applicability of various physico-chemical treatments for the removal of heavy metals such as Cd(II), Cr(III, Cr(VI), Cu(II, Ni(II) and Zn(II).
Journal ArticleDOI
Heavy metal removal mechanism of acid mine drainage in wetlands: A critical review
A. S. Sheoran,V. Sheoran +1 more
TL;DR: In this paper, a critical review of the heavy metal removal mechanism involving various physical, chemical and biological processes, which govern wetland performance, have been made. This information is important for the siting and use of wetlands for remediation of heavy metals.
Journal ArticleDOI
Biomass-derived biosorbents for metal ions sequestration: Adsorbent modification and activation methods and adsorbent regeneration
TL;DR: In this article, the authors provide a comprehensive appraisal of the equilibrium modeling of a number of biosorption processes as well as the structural, chemical and morphological modifications and activation of biosorbents.
Journal ArticleDOI
Comparison between electrocoagulation and chemical precipitation for metals removal from acidic soil leachate.
Nathalie Meunier,Patrick Drogui,Camille Montane,Robert Hausler,Guy Mercier,Jean-François Blais +5 more
TL;DR: Electrocoagulation was more effectively removed by electrochemical treatment, whereas Ni was easily removed by chemical treatment, which was up to five times lower than that recorded using chemical precipitation.