DOI: 10.1016/j.watres.2018.12.005
Scopus记录号: 2-s2.0-85058649395
论文题名: Sulfur and iron cycles promoted nitrogen and phosphorus removal in electrochemically assisted vertical flow constructed wetland treating wastewater treatment plant effluent with high S/N ratio
作者: Wang Y. ; Lin Z. ; Wang Y. ; Huang W. ; Wang J. ; Zhou J. ; He Q.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 20
结束页码: 30
语种: 英语
英文关键词: Autotrophic denitrification
; Constructed wetlands
; Electrochemical systems
; Electrons distribution
; Sulfur cycle
; Tertiary wastewater treatment
Scopus关键词: Anodes
; Bacteria
; Cathodes
; Chemicals removal (water treatment)
; Effluent treatment
; Effluents
; Eutrophication
; Iron
; Nitrogen
; Pyrites
; Reclamation
; Reduction
; Sewage pumping plants
; Wastewater treatment
; Water treatment plants
; Wetlands
; Autotrophic denitrification
; Constructed wetlands
; Electrochemical systems
; Sulfur cycles
; Tertiary wastewater treatment
; Nitrogen removal
; iron
; nitrogen
; phosphorus
; sulfur
; autotrophy
; constructed wetland
; denitrification
; effluent
; electrochemical method
; electrode
; electron
; iron
; isotopic ratio
; nitrogen
; phosphorus
; pollutant removal
; sulfur cycle
; wastewater treatment plant
; adsorption
; aquatic environment
; Article
; constructed wetland
; controlled study
; current density
; Gallionellaceae
; melting temperature
; microbial consortium
; precipitation
; priority journal
; pyrosequencing
; reverse transcription polymerase chain reaction
; waste water treatment plant
; X ray photoemission spectroscopy
英文摘要: Phosphate (PO 4 3- -P) and nitrate (NO 3 − -N) in the effluent of wastewater treatment plants are the predominant sources of eutrophication. In this study, a bench-scale electrochemically assisted vertical flow constructed wetland (E-VFCW) was developed, which exhibited favorable PO 4 3- -P (89.7–99.4%), NO 3 − -N (82.7–99.6%), and TN (51.9–93.7%) removal efficiency in tertiary wastewater treatment. In addition, little N 2 O accumulation (0.32–2.19% of △NO 3 − -N) was observed. The study further elucidated that PO 4 3- -P was removed mainly in the anode chamber by co-precipitation (Fe (n+) OH-PO 4 ) and adsorption (FeOOH-PO 4 ) pathways. Multi-pathway of NO 3 − -N reduction was proposed, with 13.9–30.2% of NO 3 − -N predominantly eliminated in the anode chamber by ferrous-dependent NO 3 − -N reduction bacteria. In the cathode chamber, electrons storage and resupply modes during S cycle exerted crucial roles in NO 3 − -N reduction, which enhanced the resilience capabilities of the E-VFCW to shock loadings. Stoichiometric analysis revealed that 3.3–6.6 mmol e − /cycle were stored in the form of S 0 , FeS, and FeS 2 in the E-VFCW under longer HRT or higher current density. However, the deposited S resupplied 19.6% and 28.3% of electrons for NO 3 − -N reduction under shorter HRT (1 h) or lower current density (0.01 mA cm −2 ). Moreover, ferrous-driven NO 3 − -N-reducing or DNRA bacteria also promoted NO 3 − -N elimination in the cathode chamber. These findings provide new insight into the coupling interactions among S, Fe and H cycles, as well as N and P transformations in electrochemically assisted NO 3 − -N reduction systems. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122072
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
Recommended Citation:
Wang Y.,Lin Z.,Wang Y.,et al. Sulfur and iron cycles promoted nitrogen and phosphorus removal in electrochemically assisted vertical flow constructed wetland treating wastewater treatment plant effluent with high S/N ratio[J]. Water Research,2019-01-01