| 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 | |
| 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. |
No similar articles found.