Bolaños Picado Dayatri Vanessa, Masis Mora Mario, Duran Herrera Esteban, Pérez Mercado Luís Fernando, López Vinent Núria, Cruz Alcalde Alberto, Alvarez Caero María Mercedes, Rodríguez Rodríguez Carlos Esteban, Sans Mazón Carmen
Escuela de Ingeniería Química, Universidad de Costa Rica, San José de Costa Rica, 11501-2060, Costa Rica.
Centro de Investigación en Contaminación Ambiental, Universidad de Costa Rica, San José de Costa Rica, 11502, Costa Rica.
Open Res Eur. 2022 Sep 1;2:105. doi: 10.12688/openreseurope.14997.1. eCollection 2022.
This work studied the use of the organic fertilizers DTPA-Fe and EDDS-Fe as iron chelates for solar driven photo-Fenton process at natural pH. This process was proposed to investigate its performance on removing a mixture of agrochemicals (propiconazole, imidacloprid and diuron) from pineapple processing wastewater to obtain a suitable effluent to be reused in the agricultural sector. Experiments were carried out in a solar simulator with a stirred cylindric photoreactor, with a volume of 150 mL and controlled temperature (20°C). The first set of experiments was carried out with ultrapure water to determine optimal iron and H O concentrations. The second was performed with simulated wastewater of pineapple processing. The optimized operational conditions for both iron complexes were 10 mg L of Fe (III) and 25 mg L of H O , since more than 80% of micropollutants (MP) (at an initial concentration of 1 mg L of each compound) were removed in only 20 min with both DTPA-Fe and EDDS-Fe. The effect of organic matter and inorganic salts on radicals scavenging and chelates stability was also investigated in the experiments performed with synthetic pineapple processing wastewater. The results disclosed differences depending on the iron complex. Nitrites were the principal component influencing the tests carried out with EDDS-Fe. While carbonates at low concentration only significantly affected the experiments performed with DTPA-Fe, they were the major influence on the MPs removal efficiency decrease. In contrast, the presence of Ca and Mg only influence on this last one. Finally, the results of phytotoxicity disclosed the suitability of treated effluent to be reused in the agricultural sector. This work demonstrated that solar powered photo-Fenton catalysed by iron fertilizer EDDS is a suitable technology for depolluting water streams coming from pineapple processing plants at circumneutral pH, and its subsequent reuse for crop irrigation.
本研究考察了有机肥料DTPA-Fe和EDDS-Fe作为铁螯合物在自然pH值下用于太阳能驱动光芬顿工艺的情况。该工艺旨在研究其对菠萝加工废水中农药混合物（丙环唑、吡虫啉和敌草隆）的去除性能，以获得适合农业部门再利用的出水。实验在配有搅拌圆柱形光反应器的太阳能模拟器中进行，反应器体积为150 mL，温度控制在20℃。第一组实验使用超纯水进行，以确定最佳铁和过氧化氢浓度。第二组实验使用菠萝加工模拟废水进行。两种铁络合物的优化操作条件均为10 mg/L的Fe(III)和25 mg/L的过氧化氢，因为使用DTPA-Fe和EDDS-Fe时，仅在20分钟内就去除了超过80%的微污染物（MP）（每种化合物的初始浓度为1 mg/L）。在用合成菠萝加工废水进行的实验中，还研究了有机物和无机盐对自由基清除和螯合物稳定性的影响。结果表明，不同铁络合物存在差异。亚硝酸盐是影响EDDS-Fe测试的主要成分。低浓度的碳酸盐仅对DTPA-Fe进行的实验有显著影响，但它们是导致MP去除效率下降的主要因素。相比之下，Ca²⁺和Mg²⁺的存在仅对后者有影响。最后，植物毒性结果表明处理后的出水适合农业部门再利用。 这项工作表明，由铁肥EDDS催化的太阳能光芬顿是一种在接近中性pH值下去除菠萝加工厂废水污染物并随后将其用于作物灌溉的合适技术。
