Synchronous N and P Removal in Carbon-Coated Nanoscale Zerovalent Iron Autotrophic Denitrification─The Synergy of the Carbon Shell and P Removal,Environmental Science & Technology

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Synchronous N and P Removal in Carbon-Coated Nanoscale Zerovalent Iron Autotrophic Denitrification─The Synergy of the Carbon Shell and P Removal
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-08-30 , DOI: 10.1021/acs.est.2c02376
Jingshu Wang ₁ , Jinhui Jeanne Huang ₁ , Yan Zhou _{2,

3} , Yuan Liao ₁ , Song Li ₁ , Beichen Zhang ₁ , Shiteng Feng ₁

Affiliation

Fe⁰ is a promising electron donor for autotrophic denitrification in the simultaneous removal of nitrate and phosphorus in low C/N wastewater. However, P removal may inevitably inhibit bio-denitrification. It has not been well recognized and led to an overdose of iron materials. This study employed carbon-coated zerovalent iron (Fe⁰@C) to support autotrophic denitrification to mitigate the inhibition effects of P removal and enhance both N and P removal. The critical role of the carbon shell in Fe⁰@C was to block the direct contact between Fe⁰ and P and NO₃^––N, to maintain the Fe⁰ activity. Besides, P inhibited the chemical reduction of NO₃^––N by competing for Fe⁰ active sites. This indirectly boosted H₂ generation and promoted bio-denitrification. P removal displayed negligible effects on microbial species but indirectly enhanced the nitrogen metabolic activities because of promoted H₂ in Fe⁰@C-based autotrophic denitrification. Bio-denitrification, in turn, strengthened Fe–P co-precipitation by promoting the formation of ferric hydroxide as a secondary adsorbent for P removal. This study demonstrated an efficient method for simultaneous N and P removal in autotrophic denitrification and revealed the synergistic interactions among N and P removal processes.

中文翻译：

碳包覆纳米零价铁自养反硝化同步脱氮除磷─碳壳与除磷的协同作用

Fe ⁰是一种很有前景的电子供体，可用于自养反硝化同时去除低碳/氮废水中的硝酸盐和磷。然而，除磷可能不可避免地抑制生物反硝化。它没有得到很好的认识并导致过量的铁材料。本研究使用碳包覆的零价铁 (Fe ⁰ @C) 来支持自养反硝化，以减轻除磷的抑制作用并增强除氮和除磷。^{Fe 0} @C中碳壳的关键作用是阻止Fe ⁰与P 和NO ₃^- -N 之间的直接接触，以维持Fe ⁰的活性。此外，P 抑制 NO _{3的化学还原}^--N 通过竞争 Fe ⁰活性位点。这间接促进了H ₂的产生并促进了生物反硝化。P去除对微生物物种的影响可以忽略不计，但由于促进了基于Fe ⁰ @C的自养反硝化中的H _{2 ，因此间接增强了氮代谢活性。}反过来，生物反硝化通过促进形成氢氧化铁作为去除 P 的辅助吸附剂来加强 Fe-P 共沉淀。本研究展示了一种在自养反硝化中同时去除 N 和 P 的有效方法，并揭示了 N 和 P 去除过程之间的协同相互作用。

更新日期：2022-08-30

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