Struvite recovery shows significant potential for simultaneously recovering nitrogen (N) and phosphorus (P) from swine wastewater but is challenged by the occurrence and transformation of antibiotic residuals. Electrochemically mediated struvite precipitation with sacrificial magnesium anode (EMSP-Mg) is promising due to its automation and chemical-free merits. However, the fate of antibiotics remains underexplored. We investigated the behavior of sulfadiazine (SD), an antibiotic frequently detected but less studied than others within the EMSP-Mg system. Significantly less SD (≤ 5%) was co-precipitated with recovered struvite in EMSP-Mg than conventional chemical struvite precipitation (CSP) processes (15.0 to 50.0%). The reduced SD accumulation in struvite recovered via EMSP was associated with increased pH and electric potential differences, which likely enhanced the electrostatic repulsion between SD and struvite. In contrast, the typical strategies used in enhancing P removal in the EMSP-Mg system, including increasing the Mg/P ratio or the Mg-release rates, have shown negligible effects on SD adsorption. Furthermore, typical coexisting ions (Ca, Cl, and HCO) inhibited SD adsorption onto recovered products. These results provide new insights into the interactions between antibiotics and struvite within the EMSP-Mg system, enhancing our understanding of antibiotic migration pathways and aiding the development of novel EMSP processes for cleaner struvite recovery.

中文翻译：

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牺牲镁阳极从养猪废水生产鸟粪石过程中微污染物的去向


鸟粪石回收显示出从养猪废水中同时回收氮 (N) 和磷 (P) 的巨大潜力，但面临抗生素残留的出现和转化的挑战。牺牲镁阳极电化学介导的鸟粪石沉淀（EMSP-Mg）由于其自动化和无化学物质的优点而前景广阔。然而，抗生素的命运仍未得到充分探索。我们研究了磺胺嘧啶 (SD) 的行为，这是一种经常被检测到的抗生素，但与 EMSP-Mg 系统中的其他抗生素相比，研究较少。与传统的化学鸟粪石沉淀 (CSP) 工艺（15.0 至 50.0%）相比，在 EMSP-Mg 中与回收的鸟粪石共沉淀的 SD（≤ 5%）显着减少。通过 EMSP 回收的鸟粪石中 SD 积累的减少与 pH 值和电位差的增加有关，这可能增强了 SD 和鸟粪石之间的静电排斥。相比之下，用于增强 EMSP-Mg 系统中 P 去除的典型策略，包括增加 Mg/P 比或 Mg 释放速率，对 SD 吸附的影响可以忽略不计。此外，典型的共存离子（Ca、Cl 和 HCO）会抑制 SD 对回收产物的吸附。这些结果为 EMSP-Mg 系统内抗生素和鸟粪石之间的相互作用提供了新的见解，增强了我们对抗生素迁移途径的理解，并有助于开发新的 EMSP 工艺，以实现更清洁的鸟粪石回收。