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Modeling and optimization of struvite recovery from wastewater and reusing for heavy metals immobilization in contaminated soil
Author(s) -
Wang Hao,
Wang Xuejiang,
Wang Weishi,
Yan Xiangbo,
Xia Peng,
Chen Jie,
Zhao Jianfu
Publication year - 2016
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4931
Subject(s) - struvite , wastewater , phosphorus , chemistry , amendment , phosphate , chromium , environmental chemistry , nutrient , contamination , nitrogen , resource recovery , nuclear chemistry , waste management , environmental engineering , environmental science , organic chemistry , political science , law , ecology , biology , engineering
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 ± 1.72 mg L −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. CONCLUSION Building up a suitable ‘bridge’ to connect and achieve recovery of nutrients and reuse of struvite. © 2016 Society of Chemical Industry