Phosphorus Competition in Bioinduced Vivianite Recovery from Wastewater
Phosphorus Competition in Bioinduced Vivianite Recovery from Wastewater
复制标题
从废水中生物诱导的紫铁矿回收中的磷竞争
DOI：
10.1021/acs.est.8b03022
复制
发表时间：
2018
影响因子：
11.4
通讯作者：
Li Nan
中科院分区：
文献类型：
--
作者：
Wang Shu;An Jingkun;Wan Yuxuan;Du Qing;Wang Xin;Cheng Xiang;Li Nan
Phosphorus undergoes a one-way flow from minerals to soil to water, which creates a phosphorus crisis as well as aquatic eutrophication. Dissimilatory metal reduction bacterial (DMRB)-induced vivianite recovery from wastewater is a promising route to solve these problems synthetically. In this study, phosphorus competition between biomass growth and bioinduced vivianite mineralization was investigated at the batch scale. Biomass growth leads to phosphorus utilization over vivianite mineralization.Geobacterwas selected as the main functional microorganism and presented higher vivianite recovery rates (20–48%) than sewage biomass (7–33%). An optimal Fe/P stoichiometric ratio of 1:1 was observed for both sewage biomass andGeobacter-inoculated batches. The highest vivianite yield of 4.3 mM was obtained inGeobacter-inoculated batches at a Fe:P of 1:1, with values 59% higher than those at a Fe:P of 1:0.67 (equal to the Fe/P molar ratio in vivianite). Sufficient PO43–stimulated cell growth and yielded a higher Fe3+reduction rate and vivianite yield. Nevertheless, excessive PO43–facilitated the precipitation of KFe3(PO4)2(OH)·8H2O and Fe7(PO4)6, which inhibited vivianite synthesis. In the optimalGeobacterbatch, the μ–Scurve indicated a mixed order reaction (0 <x< 1) for both vivianite formation and biomass growth. The vivianite growth series proceeded as follows: tiny blue particles, plain pieces, dark blue nodules, and large spherical crystals.
