globalchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2019.01.007
Scopus ID: 2-s2.0-85060354381
Highly efficient removal of phosphonates from water by a combined Fe(III)/UV/co-precipitation process
Author: Sun S.; Wang S.; Ye Y.; Pan B.
Source Publication: Water Research
ISSN: 431354
Publishing Year: 2019
pages begin: 21
pages end: 28
Language: 英语
Keyword: Advanced treatment ; Fe(III) replacement ; Phosphonates ; Photolysis
Scopus Keyword: 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
English Abstract: 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
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被引频次[WOS]:13   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候变化事实与影响

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Affiliation: 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
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