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The biological denitrification coupled with chemical reduction for groundwater nitrate remediation via using SCCMs as carbon source


The biological denitrification coupled with chemical reduction for groundwater nitrate remediation via using SCCMs as carbon source



Chemosphere 234: 89-97



ISSN/ISBN: 0045-6535

PMID: 31203045

DOI: 10.1016/j.chemosphere.2019.06.005

Renewable additional carbon sources for groundwater denitrification, such as sustainable-releasing compound carbon source materials (SCCMs), are required. This work reports long-term groundwater denitrification with permeable reactive barriers filled with SCCMs; the coupling of biological denitrification and chemical reduction avoided the need for a continuous carbon source supply. Four 370-day lab-scale permeable reactive barrier experiments with four SCCMs showed that NO3- removal efficiency in zero-valent iron (ZVI) SCCMs was higher than in ZVI-free SCCMs. In the ZVI SCCMs, the NO3- removal reaction began quickly in the early stage, owing to ZVI chemical reduction, whereas biological denitrification was lower and incomplete with a NO2- concentration of 0.8 mg L-1 in the ZVI SCCM system. As the chemical reduction efficiency decreased, the biological denitrification efficiency increased, and the highest NO3- removal efficiency was 98.8%. Decreasing the Fe2+concentration decreased ZVI chemical reduction. High-throughput sequencing indicated that the proportion of denitrifying bacteria attached to the SCCMs was up to 34.4% at the family level, leading to the denitrification gene being predominant. Quantitative PCR indicated increased microbial metabolic activity, richer bacterial community diversity, and more bacteria. Long-term monitoring data for SCCMs will help realize the use of biological denitrification coupled with chemical reduction for groundwater NO3- remediation.

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Accession: 069060582

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