What is it about?
Selenium is a vital mineral-nutrient required in low amounts by the body, and happens to be found in Earth's crust very unevenly. There is a very thin margin between selenium's vitality and toxicity. Selenium is toxic at levels of 0.7–7 milligrams (mg) per day. Selenium is nowadays an emerging water contaminant. The maximum contaminant level goal (MCLG) and MCL for selenium has been set at 0.05 parts per million (ppm) by EPA.
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Why is it important?
Selenium can cause acute health effects such as hair and fingernail changes, damage to the peripheral nervous system, fatigue, and irritability. The long-term effects include kidney and liver failure and damage to nervous system. Hence removal of selenium from water is a matter of emergent concern. Recent techniques utilized for Selenium removal include reduction, phytoremediation, coagulation and flocculation, electrochemical methods, adsorption, co-precipitation, electro-kinetics, membrane technology, photocatalysis and chemical precipitation. These techniques are discussed at length in this work.
Perspectives
This chapter indicates the different chemical methods and techniques for selenium removal and treatment, the required selection of process parameters, and discusses the the advantages and disadvantages of the selenium removal techniques. This work will be highly useful to the water professionals and chemical/environmental engineers.
Dr. Surinder Singh
Panjab University, Chandigarh
Read the Original
This page is a summary of: Chemical Methods for Removal and Treatment of Selenium from Water, May 2021, Wiley,
DOI: 10.1002/9781119693567.ch11.
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