| Autor: |
Chengchen Guo, Liang Qi, Ying Bai, Lin Yin, Ling Li, Wen Zhang |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Ecotoxicology and Environmental Safety, Vol 224, Iss , Pp 112649- (2021) |
| Druh dokumentu: |
article |
| ISSN: |
0147-6513 |
| DOI: |
10.1016/j.ecoenv.2021.112649 |
| Popis: |
The zero-valent iron (ZVI) modified wheat straw materials are widely used for treating groundwater by permeable reactive barrier (PRB). We report the performance of a field-scale PRB filled with ZVI modified wheat straw materials for nitrate (NO3-)-contaminated groundwater. In lab-scale PRB filled with ZVI modified wheat straw material, NO3- concentration entering the PRB was varied (27.80–59.86 mg L–1) according to the in situ NO3– contamination. A stable NO3− removal rate of 90% was achieved at a controlled hydraulic retention time of 22 days, together with a proportion of denitrifying bacteria up to 34.37%. The field-scale PRB filled with ZVI modified wheat straw material was successful at removing NO3– from groundwater (removal percentages ≥60%) at a groundwater flow rate of 0.01 m3 d–1. Monitoring of groundwater within this PRB provided evidences that the nitrogen gas (N2) selectivity increased with lower ammonia (NH4+) generated from ZVI reduction of NO3-, and few emission of NO2- present due to denitrification capacity in this PRB. The results are finally compared with the few others reported existing PRBs for nitrate-contaminated groundwater worldwide, and demonstrated that the ZVI modified wheat straw material would be an effective fillings for field PRB to remediate groundwater. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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