Journal ArticleDOI
Recent Advancement of Coagulation–Flocculation and Its Application in Wastewater Treatment
TLDR
In this article, a critical review on recent studies of coagulation-flocculation treatment processes of various industrial wastewaters is presented, where the limitations and challenges for the coagulated-fluctuation process such as toxicity and health hazard posed by inorganic coagulants, production of large amount of toxic sludge, ineffectiveness in removing heavy metals and emerging contaminants, increase in effluent color, inefficient pollutant removal using natural coagULants, and complexity of scaling up procedure are presented.Abstract:
Increasing environmental awareness coupled with more stringent regulation standards has triggered various industries to challenge themselves in seeking appropriate wastewater treatment technologies. Coagulation–flocculation process is regarded as one of the most important and widely used treatment processes of industrial wastewaters due to its simplicity and effectiveness. This paper provides a critical review on recent studies of coagulation–flocculation treatment processes of various industrial wastewaters. The limitations and challenges for the coagulation–flocculation process such as the toxicity and health hazard posed by inorganic coagulants, production of large amount of toxic sludge, ineffectiveness in removing heavy metals and emerging contaminants, increase in effluent color, inefficient pollutant removal using natural coagulants, and complexity of scaling up procedure are presented. In addition, an overview on the influence of process parameters on treatment efficiency is included in this revie...read more
Citations
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Journal ArticleDOI
A review on heavy metal pollution, toxicity and remedial measures: Current trends and future perspectives
TL;DR: In this article, a review of different treatment methods for removing heavy metals from the aquatic environment with a different degree of success has been presented, and the distinctive sorts of treatment strategies for the removal of the toxic metals from wastewater had been explained.
Journal ArticleDOI
Industrial water pollution, water environment treatment, and health risks in China
Qing Wang,Zhiming Yang +1 more
TL;DR: Water pollution was negatively associated with health outcomes, and the common pollutants in industrial wastewater had differential impacts on health outcomes.
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
Removal of heavy metal ions from wastewater: a comprehensive and critical review
TL;DR: In this paper, the authors comprehensively and critically review and discuss these methods in terms of used agents/adsorbents, removal efficiency, operating conditions, and the pros and cons of each method.
Journal ArticleDOI
Clay-supported nanoscale zero-valent iron composite materials for the remediation of contaminated aqueous solutions: A review
Naeim Ezzatahmadi,Godwin A. Ayoko,Graeme J. Millar,Robert Speight,Cheng Yan,Jihong Li,Shizhong Li,Jianxi Zhu,Yunfei Xi +8 more
TL;DR: A review of contaminants removed by clay-nZVI composite materials from aqueous solutions is made in this paper, where reaction mechanisms of the materials with contaminants are discussed and the removal efficiency of contaminants by composite materials is reported.
References
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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
Landfill leachate treatment: Review and opportunity
TL;DR: Today, the use of membrane technologies, more especially reverse osmosis (RO), either as a main step in a landfill leachate treatment chain or as single post-treatment step has shown to be an indispensable means of achieving purification.
Journal ArticleDOI
A review of imperative technologies for wastewater treatment I: oxidation technologies at ambient conditions
TL;DR: In this article, the authors highlight five different oxidation processes operating at ambient conditions viz. cavitation, photocatalytic oxidation, Fenton's chemistry, ozonation, and use of hydrogen peroxide.
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
Coagulation by hydrolysing metal salts
Jinming Duan,John Gregory +1 more
TL;DR: In this paper, a detailed understanding of the sweep flocculation mechanism is provided, especially with regard to the role of charge neutralization and hydroxide precipitation. But the results can be reasonably well explained in terms of established ideas, and there are also some uncertainties regarding the action of pre-hydrolysed coagulants.