Simultaneous microorganism inactivation and organic microcontaminant removal in municipal wastewater treatment plant (WWTP) secondary effluents by the solar photo-Fenton process mediated by Fe³⁺-NTA is studied in depth. To achieve this objective, different key aspects were addressed: (i) the effect of initial Fe³⁺-NTA concentration at 1:1 molar ratio (0.10-0.30 mM) and H₂O₂ concentration (1.47-5.88 mM), (ii) the effect of initial microorganism load (10³ and 10⁶ CFU/mL) and (iii) the impact of the disinfection target on treatment cost. The first stage of this work was carried out in simulated WWTP effluent spiked with 100 µg/L of imidacloprid (IMD) as model microcontaminant and inoculated with Escherichia coli (E. coli) K-12 as reference strain, in a pilot scale raceway pond reactor with 5-cm of liquid-depth. Secondly, the most cost-effective conditions were validated in actual WWTP effluent. The kinetic analysis revealed that increasing Fe³⁺-NTA concentration over 0.20 mM does not significantly reduce treatment time due to the limited effect caused on the volumetric rate photon absorption. Treatment cost is determined by the disinfection process, since IMD removal was always faster than E. coli inactivation. The most cost-effective strategy to achieve 10 CFU/100 mL of E. coli (Regulation EU 2020/741) was 0.20/4.41 mM Fe³⁺-NTA/H₂O₂, with a cost of 0.32 €/m³. A less restrictive disinfection target, 100 CFU/100 mL, allowed reducing reactant concentration and cost, 0.10/1.47 mM Fe³⁺-NTA/H₂O₂ and 0.15 €/m³, respectively. In both cases, no regrowth at 24 h and more than 90% of IMD removal were observed.

深入研究了Fe ³⁺ -NTA介导的太阳能光芬顿过程在城市污水处理厂(WWTP)二级出水中同时灭活微生物和去除有机微污染物。为了实现这一目标，解决了不同的关键方面：(i) 1:1 摩尔比 (0.10-0.30 mM) 和 H ₂ O ₂浓度 (1.47-5.88 mM)的初始 Fe ³⁺ -NTA 浓度的影响，( ii) 初始微生物负荷的影响（10 ³和 10 ⁶CFU/mL) 和 (iii) 消毒目标对处理成本的影响。这项工作的第一阶段是在模拟 WWTP 流出物中进行的，该污水中添加了 100 µg/L 吡虫啉 (IMD) 作为模型微污染物，并在中试规模的跑道池塘中接种了大肠杆菌 (E.coli) K-12 作为参考菌株具有 5 厘米液体深度的反应器。其次，在实际污水处理厂出水中验证了最具成本效益的条件。动力学分析表明，由于对体积速率光子吸收的影响有限，将 Fe ³⁺ -NTA 浓度增加到0.20 mM 以上不会显着减少处理时间。处理成本由消毒过程决定，因为 IMD 的去除总是比大肠杆菌快灭活。实现 10 CFU/100 mL大肠杆菌（欧盟法规 2020/741）的最具成本效益的策略是 0.20/4.41 mM Fe ³⁺ -NTA/H ₂ O ₂，成本为 0.32 €/m ³。限制较少的消毒目标，100 CFU/100 mL，允许降低反应物浓度和成本，分别为 0.10/1.47 mM Fe ³⁺ -NTA/H ₂ O ₂和 0.15 €/m ³。在这两种情况下，都没有观察到 24 小时的再生和超过 90% 的 IMD 去除。