| Title |
Fe(III)/Fe(II) cycle enables biological nitrate ammoniation at low C/N ratio for reactive nitrogen recovery |
| ID_Doc |
7997 |
| Authors |
Wu, Y; Jiang, XL; Wan, YX; Zhang, BC; Wang, ZY; Li, N; Wang, X |
| Title |
Fe(III)/Fe(II) cycle enables biological nitrate ammoniation at low C/N ratio for reactive nitrogen recovery |
| Year |
2024 |
| Published |
|
| DOI |
10.1016/j.resconrec.2024.107587 |
| Abstract |
The recovery of reactive nitrogen from industrial wastewater by biological ammoniation is a promising strategy of sustainable wastewater treatment. However, the low C/N ratio of pickling wastewater restricts nitrate towards ammonium, resulting in nitrogen loss. Here, we have proven the feasibility of nitrate ammoniation utilizing the Fe(III)/Fe(II) cycle at low C/N ratios, where partial organic electrons were employed to reduce Fe(III) and the regenerated Fe(II) facilitated ammoniation. It achieved the nitrate reduction efficiency of 96 +/- 2 % and ammoniation efficiency of 49 +/- 2 % for 3 cycles. Iron cycle enhanced the DNRA, demonstrated by the upregulation of nrfA and the downregulation of nirK. Electroactive Geobacter spp. with DNRA capability was sustained at high abundance (similar to 23 %) by the electron exchange process with extracellular iron. These findings provided a novel approach to recover active N using the iron cycle from wastewater, which has broader implications for sustainable circular economy and the ecology of carbon, iron and nitrogen cycle. |
| Author Keywords |
Nitrogen recovery; C/N ratio; Dissimilatory nitrate reduction to ammonium; Iron cycle; Geobacter |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001290786500001 |
| WoS Category |
Engineering, Environmental; Environmental Sciences |
| Research Area |
Engineering; Environmental Sciences & Ecology |
| PDF |
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