@article{WangWangWangetal.2020,
  author    = {Wang, Hao and Wang, Xuejiang and Wang, Weishi and Su, Yinglong and Zhao, Jianfu},
  title     = {Reuse of a phosphorus recovery product (struvite/palygorskite) from nutrient wastewater for copper remediation in aqueous solution and soil},
  series = {Geoderma : an international journal of soil science},
  volume    = {357},
  journal   = {Geoderma : an international journal of soil science},
  publisher = {Elsevier Science},
  address   = {Amsterdam [u.a.]},
  issn      = {0016-7061},
  doi       = {10.1016/j.geoderma.2019.113955},
  pages     = {10},
  year      = {2020},
  abstract  = {In this study, a phosphorus recovery product, struvite palygorskite (S-PAL), obtained from nutrient-rich wastewater by using MgO modified palygorskite was applied for copper remediation in aqueous solution and contaminated soil to achieve waste recycling. The effects of contact time, initial pH, initial Cu(II) concentration and reaction temperature on Cu(II) adsorption in aqueous solution were intensively testified. Pseudo-second-order model was able to properly describe Cu(II) adsorption kinetics by using palygorskite (PAL) and S-PAL, and S-PAL exhibited higher adsorption amount (106.27 mg/g) than PAL (8.46 mg/g) at pH of 4. Cu(II) adsorption on PAL and S-PAL could be well fitted by Freundlich isotherm and Langmuir isotherm, respectively. The calculated thermodynamic parameters indicated that Cu(II) adsorption onto PAL and S-PAL were spontaneous and endothermic. A 28-day soil incubation experiment was conducted to evaluate the effects of PAL and S-PAL with three different rates (1\%, 5\% and 10\% w/w) on Cu immobilization in contaminated soil. In the immobilization test, Cu extracted by 0.01 mol/L CaCl2 after seven days incubation significantly decreased with increasing rate of PAL and S-PAL. BCR sequential extraction results showed the significant decrease of acid soluble Cu and a concomitant increase of the residual fraction of Cu after S-PAL and PAL addition. XRD patterns of soil samples after treatment by PAL and S-PAL showed the formation of Cu0.6Mg1.3Si2O6 and Cu-3.04(PO4)(2)OH0.08 center dot 2H(2)O, which indicated that silanol groups and phosphate exhibited affinity for Cu in the soil.},
  language  = {en}
}
@article{WangWangWangetal.2016,
  author    = {Wang, Hao and Wang, Xue-jiang and Wang, Wei-shi and Yan, Xiang-bo and Xia, Peng and Chen, Jie and Zhao, Jian-fu},
  title     = {Modeling and optimization of struvite recovery from wastewater and reusing for heavy metals immobilization in contaminated soil},
  series = {Journal of chemical technology \& biotechnology},
  volume    = {91},
  journal   = {Journal of chemical technology \& biotechnology},
  publisher = {Wiley-Blackwell},
  address   = {Hoboken},
  issn      = {0268-2575},
  doi       = {10.1002/jctb.4931},
  pages     = {3045 -- 3052},
  year      = {2016},
  abstract  = {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.},
  language  = {en}
}