期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 224, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2021.112649
关键词
ZVI modified raw wheat straw; Microbiological and chemical denitrification; in-situ permeable reactive barrier (PRB); Nitrate removal; Groundwater remediation
资金
- National Natural Science Foundation Youth Project [41807187]
- Major Science and Technology Program for Water Pollution Control and Treatment [2012ZX07204-003]
The study demonstrates that the PRB filled with ZVI modified wheat straw materials shows good performance in removing nitrate-contaminated groundwater, achieving high NO3- removal rate and low NH4+ generation, making it suitable for remediation in field-scale PRBs.
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 m(3) d(-1). Monitoring of groundwater within this PRB provided evidences that the nitrogen gas (N-2) 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.
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