Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
J Hazard Mater. 2024 Oct 5;478:135505. doi: 10.1016/j.jhazmat.2024.135505. Epub 2024 Aug 13.
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.
从猪废水中同时回收氮（N）和磷（P）方面，鸟粪石回收具有很大的潜力，但抗生素残留的出现和转化对其构成了挑战。电化学介导的牺牲镁阳极鸟粪石沉淀（EMSP-Mg）具有自动化和无化学物质的优点，因此很有前景。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，磺胺嘧啶是一种在 EMSP-Mg 系统中经常检测到但研究不如其他抗生素多的抗生素。与传统的化学鸟粪石沉淀（CSP）工艺（15.0 至 50.0%）相比，在 EMPS-Mg 中与回收的鸟粪石共沉淀的 SD 明显较少（≤5%）。通过 EMPS 回收的鸟粪石中 SD 积累减少与 pH 值和电势差增加有关，这可能增强了 SD 和鸟粪石之间的静电排斥。相比之下，在 EMSP-Mg 系统中用于增强 P 去除的典型策略，包括增加 Mg/P 比或 Mg 释放率，对 SD 吸附几乎没有影响。此外，典型的共存离子（Ca、Cl 和 HCO）抑制了 SD 吸附到回收产物上。这些结果为了解抗生素与 EMPS-Mg 系统中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，并有助于开发新型 EMPS 工艺，以实现更清洁的鸟粪石回收。
