Zero-Valent Iron (ZVI) as Permeable Reactive Barrier: Chromium (VI) removal by fixed bed column of ZVI

Shivam Singh
Dept. of Civil Engineering, Motilal Nehru National Institute of Technology, Prayagraj, India , IN

Pratibha Vishwakarma
Dept. of Civil Engineering, Motilal Nehru National Institute of Technology, Prayagraj, India , IN

R. C. Vaishya
Dept. of Civil Engineering, Motilal Nehru National Institute of Technology, Prayagraj, India , IN

Keywords: Adsorption, wastewater, chromium

Abstract

Recent industrial and urban activities have led to elevated concentrations of a wide range of contaminants in
groundwater and wastewater, which affect the health of millions of people worldwide. Zero-valent Iron was the first
material to be used in permeable reactive barriers (PRBs) for groundwater remediation.This report aims to provide an
overview of fulfillment of all the requirements of permeable reactive barrier by zero valent iron. To support this aim, a
fixed bed column was studied in which chromium (VI) was removed. A column was prepared by filling 4 cm thick
layer of ZVI-Sand media (ZVI: Sand is 1:1 v/v), sandwiched between 1 cm thick layer of sand. Chromium feed was
given in downward direction. The Adams–Bohart, Thomas and Yoon–Nelson models were applied to the adsorption to
predict the breakthrough curves. Kinetic models were also applied and best curve fit model was determined.

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