Arsenic removal from water/wastewater using adsorbents—A critical review

As the environment preservation gradually becomes a matter of major social concern and more strict legislation is being imposed on effluent discharge, more effective processes are required to deal with non-readily biodegradable and toxic pollutants. Synthetic organic dyes in industrial effluents cannot be destroyed in conventional wastewater treatment and consequently, an urgent challenge is the development of new environmentally benign technologies able to mineralize completely these non-biodegradable compounds. This review aims to increase the knowledge on the electrochemical methods used at lab and pilot plant scale to decontaminate synthetic and real effluents containing dyes, considering the period from 2009 to 2013, as an update of our previous review up to 2008. Fundamentals and main applications of electrochemical advanced oxidation processes and the other electrochemical approaches are described. Typical methods such as electrocoagulation, electrochemical reduction, electrochemical oxidation and indirect electro-oxidation with active chlorine species are discussed. Recent advances on electrocatalysis related to the nature of anode material to generate strong heterogeneous OH as mediated oxidant of dyes in electrochemical oxidation are extensively examined. The fast destruction of dyestuffs mediated with electrogenerated active chlorine is analyzed. Electro-Fenton and photo-assisted electrochemical methods like photoelectrocatalysis and photoelectro-Fenton, which destroy dyes by heterogeneous OH and/or homogeneous OH produced in the solution bulk, are described. Current advantages of the exposition of effluents to sunlight in the emerging photo-assisted procedures of solar photoelectrocatalysis and solar photoelectro-Fenton are detailed. The characteristics of novel combined methods involving photocatalysis, adsorption, nanofiltration, microwaves and ultrasounds among others and the use of microbial fuel cells are finally discussed.

Decontamination of wastewaters containing synthetic organic dyes by electrochemical methods. An updated review

Removal of synthetic dyes from wastewaters: a review.

Combination of Advanced Oxidation Processes and biological treatments for wastewater decontamination—A review

Direct And Mediated Anodic Oxidation of Organic Pollutants

Electrochemical oxidation of textile wastewater and its reuse.

Activation of palm shells by phosphoric acid impregnation for high yielding activated carbon

Removal of arsenic from aqueous solution using electrocoagulation

In the present investigation, it is attempted to remove arsenic from smelter industrial wastewater through electrocoagulation. Experiments covering a wide range of operating conditions for removal of the arsenic present in the smelter wastewater are carried out in a batch electrochemical reactor. Mild Steel and Stainless Steel plates have been used as the anode and cathode respectively. It has been observed from the present work that arsenic can be removed effectively through electrocoagulation.

Arsenic Removal from Industrial Effluent through Electrocoagulation

Decolorization and COD reduction of paper industrial effluent using electro-coagulation

Natesan Balasubramanian

Papers

Electrochemical oxidation of textile wastewater and its reuse.

Activation of palm shells by phosphoric acid impregnation for high yielding activated carbon

Removal of arsenic from aqueous solution using electrocoagulation

Arsenic Removal from Industrial Effluent through Electrocoagulation

Decolorization and COD reduction of paper industrial effluent using electro-coagulation