DOI: 10.1016/j.watres.2019.01.004
Scopus记录号: 2-s2.0-85060894669
论文题名: Layered double hydroxides for phosphorus recovery from acidified and non-acidified dewatered sludge
作者: Lundehøj L. ; Jensen H.C. ; Wybrandt L. ; Nielsen U.G. ; Christensen M.L. ; Quist-Jensen C.A.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 208
结束页码: 216
语种: 英语
英文关键词: Ion exchange
; Layered double hydroxides (LDH)
; Phosphate recovery
; Sludge acidification
; Solid state NMR spectroscopy
; Wastewater
Scopus关键词: Acidification
; Biological water treatment
; Chemicals removal (water treatment)
; Chlorine compounds
; Ion exchange
; Negative ions
; Nitric acid
; Nuclear magnetic resonance spectroscopy
; pH
; Phosphorus
; Recovery
; Sewage pumping plants
; Sulfur compounds
; Wastewater
; Wastewater treatment
; Water treatment plants
; Zinc compounds
; Chemical phosphorus removal
; Layered double hydroxides
; MAS-NMR spectroscopy
; Orthophosphate concentration
; Phosphate recovery
; Powder X-ray diffraction (pXRD)
; Solid-state NMR spectroscopy
; Wastewater treatment plants
; Aluminum compounds
; aluminum hydroxide
; aluminum phosphate
; arsenic
; calcium ion
; chromium
; cuprous ion
; hydrochloric acid
; hydroxide
; iron
; lactate dehydrogenase
; lead
; magnesium ion
; nitric acid
; phosphate
; phosphorus
; sulfuric acid
; zinc ion
; acidification
; acidity
; carbon dioxide
; chemical compound
; hydrochloric acid
; hydroxide
; ion exchange
; nitric acid
; nuclear magnetic resonance
; phosphorus
; pollutant removal
; sludge
; spectroscopy
; wastewater
; wastewater treatment
; wastewater treatment plant
; acidification
; adsorption
; aluminum nuclear magnetic resonance
; Article
; pH
; phosphate transport
; phosphorus nuclear magnetic resonance
; priority journal
; sludge
; waste water
; waste water management
; waste water treatment plant
; X ray powder diffraction
英文摘要: Phosphate, which contains the essential element phosphorous (P), is a necessary fertilizer for agriculture, but the current phosphate deposits are running out and alternative sources are needed. Sludge obtained from wastewater treatment plants contains high concentrations of phosphorus and represents an alternative, sustainable source. In this study, sludge obtained from a wastewater treatment plant with biological and chemical phosphorus removal was acidified (pH = 3, 4, 5 and 6) to release orthophosphate followed by sequestration of the orthophosphate by a zinc aluminum layered double hydroxide (Zn 2 Al-LDH). Sulfuric acid (H 2 SO 4 ), nitric acid (HNO 3 ), and hydrochloric acid (HCl) was tested, which showed that only sulfate anions compete with phosphate and results in reduced phosphate recovery (25–35%). The orthophosphate concentration in the liquid phase increased from 20% (raw sludge) to 75% of the total phosphorus concentration at a pH of 3, which enhanced the phosphate uptake by the ZnAl-LDH from 1.7 ± 0.2% to 60.3 ± 0.6%. During acidification, the competing anion carbonate is degassed as CO 2 , which further improved the phosphate uptake. PXRD showed the intercalation of carbonate in the LDH in the raw sludge at pH = 8, whereas orthophosphate was intercalated at lower pH values. 27 Al MAS NMR spectroscopy and powder X-ray diffraction (PXRD) proved preservation of the LDH at all pH values. Furthermore, about a fourth of the Al is present as an amorphous aluminum phosphate (AlPO 4 ) upon exposure to phosphate at low pH (pH = 3 and 5) based on 27 Al MAS NMR spectroscopy. At a pH of 6 about a third of the P is present as brushite (CaHPO 4 ·2H 2 O). © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121980
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, Odense M, 5230, Denmark; Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej 7H, Aalborg East, 9220, Denmark
Recommended Citation:
Lundehøj L.,Jensen H.C.,Wybrandt L.,et al. Layered double hydroxides for phosphorus recovery from acidified and non-acidified dewatered sludge[J]. Water Research,2019-01-01