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Influence of activated carbon on performance and microbial communities in the treatment of solvent pollutant mixtures in a continuous stirred tank reactor

Abstract

The influence of the addition of granular activated carbon (GAC) to the anaerobic treatment of wastewater with a mixture of ethanol and 1-ethoxy-2-propanol (E2P), which are typical pollutants from flexographic/printing industry, was evaluated. For this purpose, reactor performance and microbial community were assessed in two continuous stirred tank reactors (CSTRs), i.e. control and GAC supplemented. Both reactors, seeded with anaerobic granular biomass, showed similar global performance (RE>93%), except after organic load shocks and after E2P addition. GAC supplementation substantially enhanced the response of the biological system to organic load shocks and reduced the acclimation period for E2P degradation. This improvement was found to be related to the effect of GAC on the microbial community which, in turn, is related to an increase in the degradation rate of intermediates (acetone and isopropanol). The microbial community was analysed through denaturing gradient gel electrophoresis and high-throughput sequencing. Both methods showed an evolution from the inoculum to the final time point and considerable enrichment in microorganisms involved in direct interspecies electron transfer, such as Geobacter species in the final biomass samples, especially in the biomass attached to GAC.

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Supplementary files

Article information


Submitted
05 Feb 2020
Accepted
15 Mar 2020
First published
16 Mar 2020

Environ. Sci.: Water Res. Technol., 2020, Accepted Manuscript
Article type
Paper

Influence of activated carbon on performance and microbial communities in the treatment of solvent pollutant mixtures in a continuous stirred tank reactor

P. Ferrero, M. Izquierdo , F. J. Álvarez-Hornos, J. M. Penya-Roja and V. Martínez-Soria, Environ. Sci.: Water Res. Technol., 2020, Accepted Manuscript , DOI: 10.1039/D0EW00096E

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