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Modeling and optimization of struvite recovery from wastewater and reusing for heavy metals immobilization in contaminated soil
- BACKROUND: Few studies have been carried out to connect nutrients recovery from wastewater and heavy metals immobilization in contaminated soil. To achieve the goal, ammonia nitrogen (AN) and phosphorus (P) were recovered from rare-earth wastewater by using the formation of struvite, which was used as the amendment with plant ash for copper, lead and chromium immobilization. RESULTS: AN removal efficiency and residual P reached 95.32 +/- 0.73% and 6.14 +/- 1.72mgL(-1) under optimal conditions: pH= 9.0, n(Mg): n(N): n(P)= 1.2: 1: 1.1, which were obtained using response surface methodology (RSM). The minimum available concentrations of Cu, Pb and Cr (CPC) separately reduced to 320.82 mg kg(-1), 190.77 mg kg(-1) and 121.46 mg kg(-1) with increasing immobilization time at the mass ratio of phosphate precipitate (PP)/plant ash (PA) of 1: 3. Humic acid (HA) and fulvic acid (FA) were beneficial to immobilize Cu, both of which showed no effect or even a negative effect on Pb and Cr immobilization.
Verfasserangaben: | Hao Wang, Xue-jiang Wang, Wei-shi Wang, Xiang-bo Yan, Peng Xia, Jie Chen, Jian-fu Zhao |
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DOI: | https://doi.org/10.1002/jctb.4931 |
ISSN: | 0268-2575 |
ISSN: | 1097-4660 |
Titel des übergeordneten Werks (Englisch): | Journal of chemical technology & biotechnology |
Verlag: | Wiley-Blackwell |
Verlagsort: | Hoboken |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2016 |
Erscheinungsjahr: | 2016 |
Datum der Freischaltung: | 22.03.2020 |
Freies Schlagwort / Tag: | environmental remediation; experimental design; heavy metals; immobilization; precipitation |
Band: | 91 |
Seitenanzahl: | 8 |
Erste Seite: | 3045 |
Letzte Seite: | 3052 |
Fördernde Institution: | National Natural Science Foundation of China [41571301]; International S&T Cooperation Program [2014DFA91650]; National High Technology Research and Development Program ("863" Program) of China [2012AA063608-03] |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
Peer Review: | Referiert |
Name der Einrichtung zum Zeitpunkt der Publikation: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften |