Coupled Sulfur and Iron(II) Carbonate-Driven Autotrophic Denitrification for Significantly Enhanced Nitrate Removal,Environmental Science & Technology

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Coupled Sulfur and Iron(II) Carbonate-Driven Autotrophic Denitrification for Significantly Enhanced Nitrate Removal
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-01-22 , DOI: 10.1021/acs.est.8b06865
Ting-ting Zhu ₁ , Hao-yi Cheng ₁ , Li-hui Yang _{1,

2} , Shi-gang Su _{1,

2} , Hong-cheng Wang _{1,

2} , Shu-sen Wang _{1,

2} , Ai-jie Wang _{1,

2}

Affiliation

Sulfur-based denitrification process has attracted increasing attentions because it does not rely on the external addition of organics and avoids the risk of COD exceeding the limit. Traditionally, limestone is commonly employed to maintain a neutral condition (SLAD process), but it may reduce the efficiency as the occupied zone by limestone cannot directly contribute to the denitrification. In this study, we propose a novel sulfur-based denitrification process by coupling with iron(II) carbonate ore (SICAD system). The ore was demonstrated to play roles as the buffer agent and additional electron donor. Moreover, the acid produced through sulfur driven denitrification was found to promote the Fe(II) leaching from the ore and likely extend the reaction zone from the surface to the liquid. As a result, more biomass was accumulated in the SICAD system compared with the controls (sulfur, iron(II) carbonate ore and SLAD systems). Owing to these synergistic effects of sulfur and iron(II) carbonate on denitrification, SICAD system showed much higher denitrification rate (up to 720.35 g·N/m³·d) and less accumulation of intermediates (NO₂^– and N₂O) than the controls. Additionally, sulfate production in SICAD system was reduced. These findings offer great potential of SICAD system for practical use as a highly efficient postdenitrification process.

中文翻译：

硫和铁（II）碳酸盐驱动的自养反硝化耦合，显着提高了硝酸盐的去除率

硫基反硝化工艺由于不依赖于外部有机物的添加，并且避免了COD超过限值的风险，因此引起了越来越多的关注。传统上，通常使用石灰石来保持中性状态（SLAD工艺），但是由于石灰石所占的区域不能直接促进反硝化作用，因此它可能会降低效率。在这项研究中，我们提出了一种新的基于硫的反硝化方法，该方法与碳酸亚铁（II）矿石耦合（SICAD系统）。矿石被证明充当缓冲剂和额外的电子给体。此外，发现通过硫驱动的反硝化过程产生的酸可促进Fe（II）从矿石中浸出，并可能将反应区从表面扩展到液体。因此，与对照（硫磺，碳酸亚铁矿和SLAD系统）相比，SICAD系统中积累了更多的生物质。由于硫和碳酸铁（II）对反硝化的协同作用，SICAD系统显示出更高的反硝化率（高达720.35 g·N / m³ ·d）和中间体（NO ₂^–和N ₂ O）的积累少于对照。此外，减少了SICAD系统中的硫酸盐生产。这些发现为SICAD系统作为一种高效的后反硝化过程提供了巨大的潜力。

更新日期：2019-01-23

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