Sudiartha Gede Adi Wiguna, Imai Tsuyoshi
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, 755-8611, Japan.
Environmental Engineering Study Program, Faculty of Engineering, Udayana University, Bali, 80361, Indonesia.
Sci Rep. 2025 Jul 1;15(1):21382. doi: 10.1038/s41598-025-06099-2.
Sewer corrosion, primarily driven by sulfate, sulfide, and hydrogen sulfide metabolism, accelerates pipeline deterioration and has been linked to sinkhole formation and road collapses. This study explores the use of nickel (Ni) and iron-based magnetite black (MTB) as conductive lining materials to enhance sulfide, sulfate, and hydrogen sulfide degradation. Lab-scale concrete reactors (CCRs) were constructed with three configurations: 5% Ni-lined, MTB-lined, and 100% Portland cement. The experiment was conducted in 12 cycles. Results showed that both Ni- and MTB-lined CCRs significantly improved sulfate removal efficiency, achieving complete sulfate depletion by the 10th and 11th experimental cycles, respectively. The MTB-lined CCR exhibited the highest sulfide and hydrogen sulfide removal capacity, reducing sulfide concentrations by 99% while also suppressing sulfide emission to a maximum of 100 mg/L, compared to the Ni-lined CCR (134 mg/L) and Portland (155 mg/L). This substantial performance is attributed to the synergistic activity of sulfate-oxidizing and sulfate-reducing bacteria, along with contributions from non-sulfur-metabolizing bacteria. Furthermore, methanogens actively consumed sulfide, supported by enhanced electron transfer through Ni and MTB conductive materials. These findings highlight the potential of conductive material linings to mitigate sulfide-induced sewer corrosion, offering a sustainable approach for improving sewer infrastructure durability.
下水道腐蚀主要由硫酸盐、硫化物和硫化氢的代谢驱动，加速了管道的恶化，并与污水坑形成和道路坍塌有关。本研究探索使用镍（Ni）和铁基磁铁矿黑（MTB）作为导电衬里材料，以增强硫化物、硫酸盐和硫化氢的降解。在实验室规模构建了三种配置的混凝土反应器（CCR）：衬有5%镍的、衬有MTB的和100%波特兰水泥的。实验进行了12个周期。结果表明，衬有镍和MTB的CCR均显著提高了硫酸盐去除效率，分别在第10个和第11个实验周期实现了硫酸盐的完全耗尽。衬有MTB的CCR表现出最高的硫化物和硫化氢去除能力，与衬有镍的CCR（134毫克/升）和波特兰水泥的CCR（155毫克/升）相比，将硫化物浓度降低了99%，同时还将硫化物排放抑制到最大100毫克/升。这种显著的性能归因于硫酸盐氧化菌和硫酸盐还原菌的协同活性，以及非硫代谢细菌的贡献。此外，产甲烷菌通过镍和MTB导电材料增强的电子传递，积极消耗硫化物。这些发现突出了导电材料衬里减轻硫化物引起的下水道腐蚀的潜力，为提高下水道基础设施耐久性提供了一种可持续的方法。
