4.3 Article

Effect of the biogenic precipitation of calcium carbonate on bacterial transport in sand columns

期刊

ECOHYDROLOGY & HYDROBIOLOGY
卷 21, 期 2, 页码 280-291

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EUROPEAN REGIONAL CENTRE ECOHYDROLOGY POLISH ACAD SCIENCES
DOI: 10.1016/j.ecohyd.2021.01.001

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Bacteria filtration; Hydraulic conductivity; MICCP; Sporosarcina pasteurii

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The study investigated the effectiveness of microbially induced calcium carbonate precipitation (MICCP) in reducing bacteria transport to riparian shallow groundwater, showing that MICCP treatment can reduce bacteria leaching and increase bacteria straining. The MICCP process increased filtration coefficient and relative adsorption index, while decreasing the maximum depth of bacteria transport.
Prediction of bacteria transport to riparian shallow groundwater is very important to prevent the pollution of water resources by coliform bacteria. The objective of this study was to investigate the effectiveness of microbially induced calcium carbonate precipitation (MICCP) in reducing bacteria (Escherichia coli and Pseudomonas fluorescens) transport. To perform the MICCP process, air-dried sterile sand was poured into polyvinyl chloride (PVC) cylinders (4.8 x14.92 cm) and incubated for 3 days in the presence of Sporosarcina pasteurii (similar to 10(8) Cell g(-1) sand), urea and CaCl2 (1.5 M). A pulse (0.1 pore volume (PV)) of bacteria suspension (10(8) CFU mL(-1)) was added on top of the sand columns (MICCP treated and control) and leaching experiments were followed at steady-state, saturated flow condition. Culturable bacteria were determined in the leachate and the sand extracts (resident bacteria) by colony count method. The MICCP treatment reduced saturated hydraulic conductivity (K-s) value 3.9 times compared to the control and thereby reduced bacteria leaching. Bioprecipitated calcium carbonate in MICCP columns increased bacteria straining compared to control columns especially in surface layer (0-3 cm). MICCP process increased filtration coefficient (lambda(f)), and relative adsorption index (S-R), and decreased maximum depth of bacteria transport (Z(max)). The average (C-av) and cumulative cell density (C-cum) of both bacteria passed from the MICCP column decreased around 3.9-fold compared to the control. Overall, the MICCP process has potential in bacteria filtration in the porous media reducing the risk of groundwater pollution. (C) 2021 Published by Elsevier B.V. on behalf of European Regional Centre for Ecohydrology of the Polish Academy of Sciences.

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