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Phosphorous removal and high -purity struvite recovery from hydrolyzed urine with spontaneous electricity production in Mg -air fuel cell
Liao, Meiling1,2,3; Liu, Yuan1,2; Tian, Enling1,2; Ma, Weiqi1,2,3; Liu, Hong1,2
2020-07-01
摘要In this study, a single-chamber Mg-air fuel cell (MAFC) is used to remove phosphorous (P) and to simultaneously recover struvite and electricity from synthetic hydrolyzed urine. The Mg 2+ generated from the anodic oxidation of Mg alloy provides a source of Mg for struvite precipitation. Meanwhile, the cathodic oxygen reduction re- action through a four-electron pathway produces OH- to maintain suitable pH for struvite precipitation and the avoid the addition of exogenous chemical reagents. The P concentration in the e ffluent is lower than 0.5 mg L-1 after a 15-min treatment and meets the sewage grade A discharge standard in China. The P removal e fficiency of urine reaches 99.48% with an e ffluent P concentration of 0.28 mg L-1 after a 25-min operation of MAFC, and the removed P can be completely recovered as high-purity struvite precipitation. The rate constant for P removal is calculated to be 0.46 min(-1) by fitting a first-order kinetic model. The recovered precipitation is identi fied as struvite, and the chemical analysis reveals a struvite purity of 98.26%. The maximum power density of MAFC with P-containing urine as electrolyte reaches 552.32 mW m(-3) , which is 47.39% higher than that of MAFC with P-free electrolyte. The struvite precipitation reaction can promote the electricity production of MAFC. This work provides not only a novel method for purifying and recovering resources from urine but also a new perspective for enhancing the electrochemical performance of MAFC in the future.
关键词Urine Phosphorous removal Struvite recovery Electricity production Mg-air fuel cell
DOI10.1016/j.cej.2019.123517
发表期刊CHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
卷号391页码:11
通讯作者Liu, Yuan(liuyuan@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000544679100007
语种英语