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<p>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<sup>−</sup>- and FeS<sub>2</sub>-driven autotrophic denitrification contributed 25.6% and 27.9%, respectively. Enrichment of autotrophic sulfur-oxidizing nitrate-reducing bacteria, such as <i>Sulfuritalea</i> and <i>Sulfurisoma</i>, 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.</p>

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

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月4日

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  • Zhiqi Ren,
  • Jiaying Ma,
  • Pei Ding,
  • Huaqiang Chu,
  • Xuefei Zhou,
  • Yalei Zhang

摘要

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.