<br>硫基人工湿地磷化氢产生特征及机制,Water Research

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硫基人工湿地磷化氢产生特征及机制
Water Research ( IF 11.4 ) Pub Date : 2024-04-18 , DOI: 10.1016/j.watres.2024.121639
Shuo Wang ₁ , Haodong Hu ₁ , Muhammad Tanveer ₁ , Mingde Ji ₁ , Weiqiang Chai ₂ , Haiming Wu ₁ , Huijun Xie ₃ , Zhen Hu ₁

Affiliation

磷化氢（PH3）是磷循环的重要贡献者，广泛存在于各种环境中。然而，关于人工湿地（CWs）中PH3的研究很少。本研究通过实验室规模的化武和批量实验来探索硫基化武中 PH3 生成的特征和机制。结果表明，硫基水的PH3释放通量在0.86±0.04 ng·m−2·h−1到1.88±0.09 ng·m−2·h−1之间变化。溶解的PH3是CW中的主要PH3形式，变化范围为2.73 μg·L−1至4.08 μg·L−1。基质结合的 PH3 是 PH3 的分级储存库，并随着基质深度的增加而增加。此外，硫基基质对 PH3 产量有显着改善。单质硫比黄铁矿更有利于PH3的生成。此外，PH3的产生、dsrB基因和烟酰胺腺嘌呤二核苷酸(NADH)之间存在显着的正相关性，NADH可能催化磷酸盐还原过程。 dsrB基因驱动的异化硫酸盐还原途径的最后阶段也可能为磷酸盐还原提供能量。 PH3的迁移和转化使硫基CW中有效磷（Resin-P和NaHCO3-P）从35%增加到56%，磷吸附能力提高12%。有效磷比例较高，植物对磷的吸收率提高了 17%。这项研究提高了对硫基化学武器中磷循环的认识，并为化学武器的长期稳定运行提供了新的见解。

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Characteristics and mechanisms of phosphine production in sulfur-based constructed wetlands

Phosphine (PH3) is an important contributor to the phosphorus cycle and is widespread in various environments. However, there are few studies on PH3 in constructed wetlands (CWs). In this study, lab-scale CWs and batch experiments were conducted to explore the characteristics and mechanisms of PH3 production in sulfur-based CWs. The results showed that the PH3 release flux of sulfur-based CWs varied from 0.86±0.04 ng·m−2·h−1 to 1.88±0.09 ng·m−2·h−1. The dissolved PH3 was the main PH3 form in CWs and varied from 2.73 μg·L−1 to 4.08 μg·L−1. The matrix-bound PH3 was a staging reservoir for PH3 and increased with substrate depth. In addition, the sulfur-based substrates had a significant improvement on PH3 production. Elemental sulfur is more conducive to PH3 production than pyrite. Moreover, there was a significant positive correlation between PH3 production, the dsrB gene, and nicotinamide adenine dinucleotide (NADH). NADH might catalyze the phosphate reduction process. And the final stage of the dissimilatory sulfate reduction pathway driven by the dsrB gene might also provide energy for phosphate reduction. The migration and transformation of PH3 increased the available P (Resin-P and NaHCO3-P) from 35 % to 56 % in sulfur-based CW, and the P adsorption capacity was improved by 12 %. The higher proportion of available P increased the plant uptake rate of P by 17 %. This study improves the understanding of the phosphorus cycle in sulfur-based CW and provides new insight into the long-term stable operation of CWs.

更新日期：2024-04-18

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