Department of Chemical Engineering and Environmental Technology, School of Industrial Engineerings, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain; Institute of Sustainable Processes (ISP), Dr. Mergelina, s/n, 47011 Valladolid, Spain.
Department of Chemical Engineering and Environmental Technology, School of Industrial Engineerings, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain; Institute of Sustainable Processes (ISP), Dr. Mergelina, s/n, 47011 Valladolid, Spain; Centro para la Investigación en Recursos Acuáticos de Nicaragua, CIRA/UNAN, Managua 4598, Nicaragua.
Sci Total Environ. 2019 Nov 20;692:259-266. doi: 10.1016/j.scitotenv.2019.07.126. Epub 2019 Jul 9.
Traditional swine manure treatments are not fully effective in the removal of veterinary drugs. Moreover, they are costly and entail a significant carbon footprint in many cases. Innovative biological approaches based on phototrophic microorganisms have recently emerged as promising alternatives to overcome those limitations. This work evaluated the removal of 19 veterinary drugs (i.e., 16 antibiotics, 1 analgesic, 1 anti-parasitic and 1 hormone) from piggery wastewater (PWW) in two open photobioreactors (PBR) operated with a consortium of microalgae-bacteria (AB-PBR) and purple photosynthetic bacteria (PPB-PBR). Multiple hydraulic retention times (HRT), in particular 11, 8 and 4 days, were tested during stage I, II and III, respectively. Ten out of 19 target compounds were detected with inlet drug concentrations ranging from 'non-detected' (n.d.) to almost 23,000 ng L for the antibiotic oxytetracycline. Moreover, three of the antibiotics (i.e., enrofloxacin, sulfadiazine and oxytetracycline) were found at concentrations above the analytical linearity range in some or all of the samples under study. AB-PBR supported higher removal efficiencies (REs) than PPB-PBR, except for danofloxacin. Overall, REs progressively decreased when decreasing the HRT. The highest REs (>90%) were observed for doxycycline (95 ± 3%) and oxytetracycline (93 ± 3%) in AB-PBR during stage I. The other drugs, except sulfadimidine that was the most recalcitrant, showed REs above 70% during stage I in the same photobioreactor. In contrast, no removal was observed for danofloxacin in AB-PBR during stage III, sulfadimidine in PPB-PBR during stage III or marbofloxacin in PPB-PBR during the entire experiment.
传统的猪粪处理方法在去除兽药方面效果并不完全理想。此外，在许多情况下，这些方法成本高昂，碳足迹巨大。最近，基于光养微生物的创新生物方法已经出现，成为克服这些限制的有前途的替代方法。本工作评估了两种开放式光生物反应器（PBR）中基于微藻-细菌（AB-PBR）和紫色光合细菌（PPB-PBR）的共生体从猪场废水中去除 19 种兽药（16 种抗生素、1 种镇痛药、1 种抗寄生虫药和 1 种激素）的效果。在第一阶段、第二阶段和第三阶段分别测试了多个水力停留时间（HRT），特别是 11、8 和 4 天。在研究中，进水药物浓度从“未检出”（n.d.）到接近 23000ng/L 的抗生素土霉素不等，共检测到 19 种目标化合物中的 10 种。此外，在一些或所有研究样本中，三种抗生素（恩诺沙星、磺胺嘧啶和土霉素）的浓度超过了分析线性范围。AB-PBR 的去除效率（RE）高于 PPB-PBR，除了达氟沙星。总体而言，随着 HRT 的降低，RE 逐渐降低。在第一阶段，AB-PBR 中多西环素（95±3%）和土霉素（93±3%）的 RE 最高。其他药物，除了磺胺嘧啶，在第一阶段的光生物反应器中 RE 均高于 70%。相比之下，在第三阶段 AB-PBR 中未观察到达氟沙星的去除，在第三阶段 PPB-PBR 中未观察到磺胺嘧啶的去除，在整个实验中 PPB-PBR 中未观察到马波沙星的去除。
