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Peer-reviewedCC BY-NC-ND 4.0Communications Engineering

In-situ enhancement of autotrophic nitrogen removal in coking wastewater using staged diatomite and pyrite strategy

  • Zhiqi Ren1
  • Jiaying Ma1
  • Pei Ding1
  • Huaqiang Chu1,2
  • Xuefei Zhou1,2
  • Yalei Zhang1,2,3
  1. 1State Key Laboratory of Water Pollution Control and Green Resource Recycling, College of Environmental Science and Engineering, Tongji University, Shanghai, China
  2. 2Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, China
  3. 3College of Environment & Safety Engineering, Fuzhou University, Fuzhou, China
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Abstract

Due to toxicity inhibition and high external carbon costs, anaerobic/anoxic/oxic technologies for coking wastewater require efficient, low-carbon alternatives. Here we develop a strategy to effectively enhance the autotrophic nitrogen removal process in coking wastewater through a phased addition of diatomite porous material and an inorganic electron donor. Under long-term operation, diatomite increased biomass by 86% and induced micro-granular sludge with an average size of 196 μm. Nitrogen removal pathway analysis showed a shift from heterotrophic to autotrophic mode. Ultimately, SCN−- and FeS2-driven autotrophic denitrification contributed 25.6% and 27.9%, respectively. Enrichment of autotrophic sulfur-oxidizing nitrate-reducing bacteria, such as Sulfuritalea and Sulfurisoma, provided strong evidence. Additional pyrite supplementation ultimately increased total nitrogen removal from 77.7% to over 94.0% without external carbon. This study enhanced the in-situ autotrophic process of conventional systems for coking wastewater, offering a cost-effective pathway for energy-saving and carbon-reduction goals.

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Cite

BibTeXRIS
BibTeX
@article{ren2026insitu,
  title = {{In-situ enhancement of autotrophic nitrogen removal in coking wastewater using staged diatomite and pyrite strategy}},
  author = {Zhiqi Ren and Jiaying Ma and Pei Ding and Huaqiang Chu and Xuefei Zhou and Yalei Zhang},
  journal = {Communications Engineering},
  year = {2026},
  month = jul,
  doi = {10.1038/s44172-026-00718-0},
  url = {https://doi.org/10.1038/s44172-026-00718-0},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - JOUR
TI  - In-situ enhancement of autotrophic nitrogen removal in coking wastewater using staged diatomite and pyrite strategy
AU  - Zhiqi Ren
AU  - Jiaying Ma
AU  - Pei Ding
AU  - Huaqiang Chu
AU  - Xuefei Zhou
AU  - Yalei Zhang
PY  - 2026
DA  - 2026/07/04
JO  - Communications Engineering
DO  - 10.1038/s44172-026-00718-0
UR  - https://doi.org/10.1038/s44172-026-00718-0
AB  - Due to toxicity inhibition and high external carbon costs, anaerobic/anoxic/oxic technologies for coking wastewater require efficient, low-carbon alternatives. Here we develop a strategy to effectively enhance the autotrophic nitrogen removal process in coking wastewater through a phased addition of diatomite porous material and an inorganic electron donor. Under long-term operation, diatomite increased biomass by 86% and induced micro-granular sludge with an average size of 196 μm. Nitrogen removal pathway analysis showed a shift from heterotrophic to autotrophic mode. Ultimately, SCN−- and FeS2-driven autotrophic denitrification contributed 25.6% and 27.9%, respectively. Enrichment of autotrophic sulfur-oxidizing nitrate-reducing bacteria, such as Sulfuritalea and Sulfurisoma, provided strong evidence. Additional pyrite supplementation ultimately increased total nitrogen removal from 77.7% to over 94.0% without external carbon. This study enhanced the in-situ autotrophic process of conventional systems for coking wastewater, offering a cost-effective pathway for energy-saving and carbon-reduction goals.
SN  - 2731-3395
ER  -