Scholarlink

<p>Removal of sulfonamides during the dewatering of sludge is critical to lighten the burden on downstream treatment processes such as anaerobic digestion. However, to this end, the preferred peroxide-based advanced oxidation processes are inadequate due to their insufficient oxidation efficiency, resulting in low removal of sulfonamides. The present study introduced a novel sludge dewatering approach, involving scrap iron combined with percarbonate (SPC) to produce high-valent iron for the removal of sulfonamide, with a focus on sulfamethoxazole (SMX) as the representative sulfonamide compound. Under optimized conditions, the treatment involving the combination of scrap iron and SPC resulted in a water content of 54.8% ± 0.3% and removed 46.9% ± 0.5% of SMX at a chemical cost of 19.6 $/t of total solids, demonstrating competitiveness to contemporary peroxides-based advanced oxidation processes. High-valent iron effectively broke down the key binding compounds and sites between extracellular polymeric substances (EPS) and SMX, leading to a shift towards hydrophobic bonding sites, smaller and more dispersed particle configurations, and reduced capacity for retaining water. This facilitated the release of SMX into liquid phases, followed by degradation by reactive oxygen species. These findings collectively demonstrate that the proposed method of using scrap iron in conjunction with SPC can remarkably reduce the volume of sludge and enhance the removal of SMX during the dewatering of sludge.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

High-valent iron-driven sulfamethoxazole removal during sludge dewatering process

  • 期刊论文

  • 发表日期：

    2026年1月5日

查看全文
  • Jialin Liang,
  • Chengjian Li,
  • Jiaqi Zhang,
  • Liang Zhang,
  • Jiewen Yang,
  • Shuiyu Sun,
  • Jonathan W. C. Wong

摘要

Removal of sulfonamides during the dewatering of sludge is critical to lighten the burden on downstream treatment processes such as anaerobic digestion. However, to this end, the preferred peroxide-based advanced oxidation processes are inadequate due to their insufficient oxidation efficiency, resulting in low removal of sulfonamides. The present study introduced a novel sludge dewatering approach, involving scrap iron combined with percarbonate (SPC) to produce high-valent iron for the removal of sulfonamide, with a focus on sulfamethoxazole (SMX) as the representative sulfonamide compound. Under optimized conditions, the treatment involving the combination of scrap iron and SPC resulted in a water content of 54.8% ± 0.3% and removed 46.9% ± 0.5% of SMX at a chemical cost of 19.6 $/t of total solids, demonstrating competitiveness to contemporary peroxides-based advanced oxidation processes. High-valent iron effectively broke down the key binding compounds and sites between extracellular polymeric substances (EPS) and SMX, leading to a shift towards hydrophobic bonding sites, smaller and more dispersed particle configurations, and reduced capacity for retaining water. This facilitated the release of SMX into liquid phases, followed by degradation by reactive oxygen species. These findings collectively demonstrate that the proposed method of using scrap iron in conjunction with SPC can remarkably reduce the volume of sludge and enhance the removal of SMX during the dewatering of sludge.