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.
Author details: | 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 |
Title of parent work (English): | Journal of chemical technology & biotechnology |
Publisher: | Wiley-Blackwell |
Place of publishing: | Hoboken |
Publication type: | Article |
Language: | English |
Year of first publication: | 2016 |
Publication year: | 2016 |
Release date: | 2020/03/22 |
Tag: | environmental remediation; experimental design; heavy metals; immobilization; precipitation |
Volume: | 91 |
Number of pages: | 8 |
First page: | 3045 |
Last Page: | 3052 |
Funding 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] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
Peer review: | Referiert |
Institution name at the time of the publication: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften |