DOI: 10.1016/j.watres.2019.01.007
Scopus记录号: 2-s2.0-85060354381
论文题名: Highly efficient removal of phosphonates from water by a combined Fe(III)/UV/co-precipitation process
作者: Sun S. ; Wang S. ; Ye Y. ; Pan B.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 21
结束页码: 28
语种: 英语
英文关键词: Advanced treatment
; Fe(III) replacement
; Phosphonates
; Photolysis
Scopus关键词: Activated sludge process
; Calcium compounds
; Effluents
; Irradiation
; Metal complexes
; Phosphorus
; Photolysis
; Sewage
; Water pollution
; Activated sludge treatment
; Advanced treatment
; Industrial effluent
; Intermediate product
; Operational conditions
; Phosphonate complex
; Phosphonates
; Phosphorous removal
; Iron compounds
; ferric ion
; metal complex
; phosphate
; phosphonic acid derivative
; phosphorus
; activated sludge
; effluent
; irradiation
; organic compound
; photolysis
; pollutant removal
; precipitation (chemistry)
; ultraviolet radiation
; activated sludge
; Article
; chemical bond
; complex formation
; degradation
; effluent
; precipitation
; priority journal
; reduction (chemistry)
; ultraviolet irradiation
; water treatment
英文摘要: Considerable amount of phosphorous is present as organic phosphonates (usually in the form of metal complexes, e.g., Ca(II)-phosphonate) in domestic and industrial effluents, which cannot be effectively removed by traditional processes for phosphate. Herein, we employed a proprietary process, i.e., Fe(III) displacement/UV irradiation/co-precipitation (denoted Fe(III)/UV/NaOH), to enable an efficient removal of Ca(II)-phosphonate complexes from water. The combined process includes three basic steps, i.e., Fe(III) replacement with the complexed Ca(II) to form Fe(III)-phosphonate of high photo-reactivity, UV-mediated degradation of Fe(III)-phosphonate to form phosphate and other intermediates, and the final phosphorous removal via co-precipitation at pH = 6. The operational conditions for the combined process to remove a typical phosphonate Ca(II)-NTMP (nitrilotrismethylenephosphonate) are optimized, where ∼60% NTMP is transformed to phosphate with the total phosphorous reduction from 1.81 mg/L to 0.17 mg/L. Under UV irradiation, the cleavage of NTMP is identified at the C-N and C-P bonds to form the intermediate products and phosphate in sequence. Also, the combined process is employed for treatment of two authentic effluents before and after activated sludge treatment, resulting in the phosphorous drop from 4.3 mg/L to 0.23 mg/L and from 0.90 mg/L to 0.14 mg/L respectively, which is much superior to other processes including Fenton/co-precipitation. In general, the combined process exhibits great potential for efficient removal of phosphonates from contaminated waters. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121998
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China; Research Center for Environmental Nanotechnology (ReCENT), Nanjing University, Nanjing, 210023, China
Recommended Citation:
Sun S.,Wang S.,Ye Y.,et al. Highly efficient removal of phosphonates from water by a combined Fe(III)/UV/co-precipitation process[J]. Water Research,2019-01-01