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Biostimulation Versus Bioaugmentation for the Electro-bioremediation of 2,4-Dichlorophenoxyacetic Acid Polluted Soils by Silvia Barba; José Villaseñor; Manuel A. Rodrigo; Pablo Cañizares is a Environmental Science article available to read on EtoBox.

What is Biostimulation Versus Bioaugmentation for the Electro-bioremediation of 2,4-Dichlorophenoxyacetic Acid Polluted Soils about?

The aim of this work is to compare three biological strategies for the in situ remediation of a 2,4-dichlorophenoxyacetic acid (2,4-D) polluted clayey soil by coupling electrokinetics (EK) and bioremediation (technology named as electrobioremediation, EBR). The first option (i) is EK-biostimulation, in which the activity of microorganisms already present in soil is enhanced by EK phenomena. The second and third options are EK-bioaugmentation, which consist of addition of microorganisms to soil through the inclusion of permeable biological barriers: (ii) using a microbial fixed biofilm reactor as biobarrier (BB1), and (iii) using a mixture of clean soil and a microbial suspension as biobarrier (BB2). Thus, three batch experiments at bench scale were conducted under a constant electric field of 1 V cm, and electrode polarity was periodically reversed every 12 h (2 d). The duration of each test was 10 days. Two additional tests using only biodegradation or only EK were performed as auxiliary reference tests. A microbial consortium acclimated to 2,4-D biodegradation was employed. Results showed that EK-biostimulation strategy offered the best pollutant removal efficiency (reaching up a

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Author

Silvia Barba; José Villaseñor; Manuel A. Rodrigo; Pablo Cañizares

Publisher

Elsevier BV

Published

2020

Language

EN

Field

Environmental Science (Physical Sciences)