Removal of heavy metal ions from wastewaters: A review

Recent developments of zinc oxide based photocatalyst in water treatment technology: A review

The controversy related to the environment pollution is increasing in human life and in the eco-system. Especially, the water pollution is growing rapidly due to the wastewater discharge from the industries. The only way to find the new water resource is the reuse of treated wastewater. Several remediation technologies are available which provides a convenience to reuse the reclaimed wastewater. Heavy metals like Zn, Cu, Pb, Ni, Cd, Hg, etc. contributes various environmental problems based on their toxicity. These toxic metals are exposed to human and environment, the accumulation of ions takes place which causes serious health and environmental hazards. Hence, it is a major concern in the environment. Due to this concern, the significance of developing technology for removing heavy metals has been increased. This paper contributes the outline of new literature with two objectives. First, it provides the sketch about treatment technologies followed by their heavy metal capture capacity from industrial effluent. The treatment performance, their remediation capacity and probable environmental and health impacts were deliberated in this review article. Conclusively, this review paper furnishes the information about the important methods incorporated in lab scale studies which are required to identify the feasible and convenient wastewater treatment. Moreover, attempts have been made to confer the emphasis on sequestration of heavy metals from industrial effluent and establish the scientific background for reducing the discharge of heavy metals into the environment.

Efficient techniques for the removal of toxic heavy metals from aquatic environment: A review

Wastewater treatment by means of advanced oxidation processes at basic pH conditions: a review.

Heavy metals like arsenic, copper, cadmium, chromium, nickel, zinc, lead, and mercury are major pollutants of fresh water reservoirs because of their toxic, non-biodegradable, and persistent nature. The industrial growth is the major source of heavy metals introducing such pollutants into different segments of the environment including air, water, soil, and biosphere. Heavy metals are easily absorbed by fishes and vegetables due to their high solubility in the aquatic environments. Hence, they may accumulate in the human body by means of the food chain. Various methods have been developed and used for water and wastewater treatment to decrease heavy metal concentrations. These technologies include membrane filtration, ion-exchange, adsorption, chemical precipitation, nanotechnology treatments, electrochemical and advanced oxidation processes. In this review, the methods as well as their mechanisms and efficiency are discussed.

Removal of Heavy Metals from Industrial Wastewaters: A Review

Equilibrium studies of the sorption of Hg(II) ions onto chitosan

Photocatalytic degradation of terephthalic acid using titania and zinc oxide photocatalysts: Comparative study

Removal of Mn2+ ions from synthetic wastewater by electrocoagulation process.

Removal of Co (II) from aqueous solution by electrocoagulation process using aluminum electrodes

In this paper, removal of Manganese (Mn 2+ ) and Cobalt (Co 2+ ) ions from aqueous solutions are studied using electrocoagulation (EC) with aluminium electrodes. The effect of operational parameters such as initial metal concentration, applied current density, charge loading and the presence of other metal ions on the performance of the EC process were investigated. The experimental results revealed that the removal rate of Mn 2+ and Co 2+ decreased by increasing the initial metal concentration. Increasing the current density accelerated the pollutant removal rate. Also, it was found that Cobalt ions were removed twice faster than Manganese ions under the same conditions. The optimum EC-post contact time was 15 min and about 10% additional removal of Mn 2+ and Co 2+ was observed. In addition, the obtained results showed that Mn 2+ and Co 2+ were effectively removed from an industrial wastewater at optimal operating conditions.

Ashraf Shafaei

Papers

Equilibrium studies of the sorption of Hg(II) ions onto chitosan

Photocatalytic degradation of terephthalic acid using titania and zinc oxide photocatalysts: Comparative study

Removal of Mn2+ ions from synthetic wastewater by electrocoagulation process.

Removal of Co (II) from aqueous solution by electrocoagulation process using aluminum electrodes

Evaluation of Mn2+ and Co2+ removal by electrocoagulation: A case study