DOI: 10.1016/j.watres.2018.10.030
Scopus记录号: 2-s2.0-85055908596
论文题名: A pilot-scale, bi-layer bioretention system with biochar and zero-valent iron for enhanced nitrate removal from stormwater
作者: Tian J. ; Jin J. ; Chiu P.C. ; Cha D.K. ; Guo M. ; Imhoff P.T.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 378
结束页码: 387
语种: 英语
英文关键词: Internal water storage
; Nitrate removal
; Redox potential
; Tracer test
; Water retention
Scopus关键词: Biochemical oxygen demand
; Cells
; Cytology
; Denitrification
; Dissolved oxygen
; Groundwater
; Infiltration
; Iron compounds
; Nitrates
; Redox reactions
; Storms
; Nitrate removal
; Redox potentials
; Tracer tests
; Water retention
; Water storage
; Nitrogen removal
; biochar
; bromide
; charcoal
; dissolved oxygen
; iron
; nitrate
; storm water
; unclassified drug
; zero valent iron
; biochar
; bromide
; denitrification
; dissolved oxygen
; electron
; infiltration
; instrumentation
; iron nanoparticle
; nitrate
; nitrogen
; performance assessment
; pollutant removal
; redox potential
; reduction
; residence time
; saturation
; tracer
; water retention
; Article
; comparative study
; controlled study
; corrosion
; denitrification
; environmental temperature
; hydrology
; limit of detection
; moisture
; oxidation reduction potential
; porosity
; priority journal
; reduction (chemistry)
; steady state
; volumetry
; water content
; water retention
; wood
英文摘要: Nitrogen (N) removal in conventional bioretention systems is highly variable owing to the low nitrate (NO3 −) elimination efficiency. We hypothesized that amending bioretention cells with biochar and zero-valent iron (ZVI) could improve the NO3 − removal performance. A well-instrumented, bi-layer pilot-scale bioretention cell was developed to test the hypothesis by investigating its hydrologic performance and NO3 − removal efficacy as affected by biochar and ZVI amendments. The cell containing 18% (v/v) wood biochar in the vadose zone and 10% (v/v) ZVI in the saturation zone was monitored for 18 months of field infiltration tests using synthetic stormwater amended with bromide (tracer) and NO3 −. Compared to the Control cell without amendments, the Biochar/ZVI cell increased water retention by 11–27% and mean residence time by 0.7–3.8 h. The vadose zone of the Biochar/ZVI cell removed 30.6–95.7% (0.6–12.7 g) of NO3-N from the influent, as compared with −6.1–89.6% (−0.1–2.9 g) by that of the Control cell. While the performance varied with synthetic storm events and seasons, in all cases the Biochar/ZVI cell resulted in greater NO3 − removal than the Control cell. This improvement was presumably due to biochar's ability to improve water retention, facilitate anoxic conditions, increase residence time, and provide electrons for microbial denitrification. The saturation zone with ZVI amendment further promoted NO3 − removal: removal was 1.8 times greater relative to the control in the first infiltration test, but was minimal in following tests. The reduction in performance of the ZVI amendment in subsequent tests might be due to diminished NO3-N input to the saturation zone after treatment by the biochar-amended vadose zone. The redox potential and dissolved oxygen content at the vadose/saturation zone interface also indicated more favorable denitrification conditions in the Biochar/ZVI cell. Biochar amendment demonstrated significant promise for increasing nitrate removal in bioretention systems. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122194
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan 610066, China; Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19716, United States; Department of Agriculture and Natural Resources, Delaware State University, Dover, DE 19901, United States
Recommended Citation:
Tian J.,Jin J.,Chiu P.C.,et al. A pilot-scale, bi-layer bioretention system with biochar and zero-valent iron for enhanced nitrate removal from stormwater[J]. Water Research,2019-01-01