DOI: 10.5194/hess-21-4011-2017
Scopus记录号: 2-s2.0-85027188698
论文题名: Transport and degradation of perchlorate in deep vadose zone: Implications from direct observations during bioremediation treatment
作者: Dahan O ; , Katz I ; , Avishai L ; , Ronen Z
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 8 起始页码: 4011
结束页码: 4020
语种: 英语
Scopus关键词: Biodegradation
; Bioremediation
; Biotechnology
; Chlorine compounds
; Groundwater
; Inorganic compounds
; Irrigation
; Monitoring
; Organic carbon
; Soils
; Solvents
; Chloride concentrations
; Dissolved organic carbon
; Enhanced biodegradation
; Environmental conditions
; Experimental conditions
; In-situ bioremediation
; Microbiological reduction
; Perchlorate concentration
; Infiltration
; biodegradation
; bioremediation
; bromide
; concentration (composition)
; dissolved organic carbon
; drip irrigation
; experimental study
; microbial activity
; mobilization
; monitoring system
; ozone
; perchlorate
; percolation
; pollutant transport
; tracking
; vadose zone
英文摘要: An in situ bioremediation experiment of a deep vadose zone (∼ 40 m) contaminated with a high concentration of perchlorate (> 25 000 mg Lg-1) was conducted through a full-scale field operation. Favourable environmental conditions for microbiological reduction of perchlorate were sought by infiltrating an electron donor-enriched water solution using drip irrigation underlying an airtight sealing liner. A vadose zone monitoring system (VMS) was used for real-time tracking of the percolation process, the penetration depth of dissolved organic carbon (DOC), and the variation in perchlorate concentration across the entire soil depth. The experimental conditions for each infiltration event were adjusted according to insight gained from data obtained by the VMS in previous stages. Continuous monitoring of the vadose zone indicated that in the top 13 m of the cross section, perchlorate concentration is dramatically reduced from thousands of milligrams per litre to near-detection limits with a concurrent increase in chloride concentration. Nevertheless, in the deeper parts of the vadose zone (< 17 m), perchlorate concentration increased, suggesting its mobilization down through the cross section. Breakthrough of DOC and bromide at different depths across the unsaturated zone showed limited migration capacity of biologically consumable carbon and energy sources due to their enhanced biodegradation in the upper soil layers. Nevertheless, the increased DOC concentration with concurrent reduction in perchlorate and increase in the chloride-to-perchlorate ratio in the top 13 m indicate partial degradation of perchlorate in this zone. There was no evidence of improved degradation conditions in the deeper parts where the initial concentrations of perchlorate were significantly higher. © 2017 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79090
Appears in Collections: 气候变化事实与影响
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作者单位: Zuckerberg Institute for Water Research (ZIWR), Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Israel
Recommended Citation:
Dahan O,, Katz I,, Avishai L,et al. Transport and degradation of perchlorate in deep vadose zone: Implications from direct observations during bioremediation treatment[J]. Hydrology and Earth System Sciences,2017-01-01,21(8)