DOI: 10.1016/j.watres.2018.07.020
Scopus记录号: 2-s2.0-85050317080
论文题名: Vivianite as the main phosphate mineral in digested sewage sludge and its role for phosphate recovery
作者: Wilfert P. ; Dugulan A.I. ; Goubitz K. ; Korving L. ; Witkamp G.J. ; Van Loosdrecht M.C.M.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 312
结束页码: 321
语种: 英语
英文关键词: Mössbauer spectroscopy
; Phosphate recovery
; Sewage sludge
; Vivianite
; XRD
Scopus关键词: Anaerobic digestion
; Energy dispersive spectroscopy
; Iron compounds
; Phosphate minerals
; Recovery
; Scanning electron microscopy
; Sewage sludge
; Waste incineration
; Wastewater treatment
; X ray diffraction
; Digested sewage sludge
; Energy dispersive X ray spectroscopy
; Municipal wastewater treatment plants
; Phosphate recovery
; Phosphate removal
; Ssbauer spectroscopies
; Struvite recoveries
; Vivianite
; Sludge digestion
; ferric phosphate
; ferrous ion
; unclassified drug
; vivianite
; anaerobic digestion
; incineration
; magnetic property
; Mossbauer spectroscopy
; phosphatase
; pollutant removal
; recovery
; sewage
; sludge
; vivianite
; waste technology
; wastewater treatment plant
; X-ray diffraction
; anaerobic digestion
; Article
; energy dispersive X ray spectroscopy
; Mossbauer spectroscopy
; priority journal
; quantitative analysis
; scanning electron microscopy
; sludge digestion
; waste water management
; waste water recycling
; X ray diffraction
英文摘要: Phosphate recovery from sewage sludge is essential in a circular economy. Currently, the main focus in centralized municipal wastewater treatment plants (MWTPs) lies on struvite recovery routes, land application of sludge or on technologies that rely on sludge incineration. These routes have several disadvantages. Our study shows that the mineral vivianite, Fe2(PO4)3 × 8H2O, is present in digested sludge and can be the major form of phosphate in the sludge. Thus, we suggest vivianite can be the nucleus for alternative phosphate recovery options. Excess and digested sewage sludge was sampled from full-scale MWTPs and analysed using x-ray diffraction (XRD), conventional scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), environmental SEM-EDX (eSEM-EDX) and Mössbauer spectroscopy. Vivianite was observed in all plants where iron was used for phosphate removal. In excess sludge before the anaerobic digestion, ferrous iron dominated the iron pool (≥50%) as shown by Mössbauer spectroscopy. XRD and Mössbauer spectroscopy showed no clear correlation between vivianite bound phosphate versus the iron content in excess sludge. In digested sludge, ferrous iron was the dominant iron form (>85%). Phosphate bound in vivianite increased with the iron content of the digested sludge but levelled off at high iron levels. 70–90% of all phosphate was bound in vivianite in the sludge with the highest iron content (molar Fe:P = 2.5). The quantification of vivianite was difficult and bears some uncertainty probably because of the presence of impure vivianite as indicated by SEM-EDX. eSEM-EDX indicates that the vivianite occurs as relatively small (20–100 μm) but free particles. We envisage very efficient phosphate recovery technologies that separate these particles based on their magnetic properties from the complex sludge matrix. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112512
Appears in Collections: 气候减缓与适应
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作者单位: Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 7, Leeuwarden, MA 8911, Netherlands; Dept. Biotechnology, Delft University of Technology, Van der Maasweg 9, Delft, HZ 2629, Netherlands; Fundamental Aspects Mat & Energy Group, Delft University of Technology, Mekelweg 15, Delft, JB 2629, Netherlands; King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), Division of Biological and Environmental Science and Engineering (BESE), Thuwal, 23955-6900, Saudi Arabia
Recommended Citation:
Wilfert P.,Dugulan A.I.,Goubitz K.,et al. Vivianite as the main phosphate mineral in digested sewage sludge and its role for phosphate recovery[J]. Water Research,2018-01-01,144