Vivaldi Gaetano Alessandro, Camposeo Salvatore, Caponio Gabriele, Lopriore Giuseppe, Discipio Francesco, Apollonio Francesca, Triggiano Francesco, De Giglio Osvalda, Montagna Maria Teresa
Department of Agricultural and Environmental Science, University of Bari Aldo Moro, Via Amendola 165/A, 70126 Bari, Italy.
Department of Science of Agriculture, Food and Environment, University of Foggia, Via Napoli 25, 71122 Foggia, Italy.
Pathogens. 2022 Apr 20;11(5):488. doi: 10.3390/pathogens11050488.
This study aimed to evaluate pathogenic bacterial contamination of the water-soil-plant system in potted olive trees irrigated with reclaimed wastewater. Desalinated water (DW) obtained by treating municipal wastewater (SW) and reclaimed water (RW) obtained by mixing SW with the brine (BR) produced by DESERT technology (tertiary treatment by ultrafiltration, active carbon and reverse osmosis) were used. Two different irrigation regimes were compared: full irrigation (FI) and regulated deficit irrigation (RDI). During two irrigation seasons the concentrations of , enterococci, spores of sulfite-reducing Clostridia (SRC) and spp. were monitored in water, soil and fruit samples. Microbial concentrations in DW were always below the threshold for reuse in agriculture, while RW showed the highest level of contamination for all observed parameters. RDI management appeared to increase the soil content of SRC spores with respect to FI. Sporadically low SRC spore contamination was recorded in some fruits only in 2018, regardless of the irrigation source, probably because of accidental contamination during sampling or post-harvest handling. This study encourages the creation of a better regulatory framework reference, with specific guidelines for the use of RW as part of integrated environmental systems for the management of sustainable agriculture.
本研究旨在评估用再生废水灌溉的盆栽橄榄树水-土-植物系统中的致病细菌污染情况。使用了通过处理城市污水（SW）获得的淡化水（DW）以及通过将SW与DESERT技术（通过超滤、活性炭和反渗透进行三级处理）产生的盐水（BR）混合而得到的再生水（RW）。比较了两种不同的灌溉制度：充分灌溉（FI）和调亏灌溉（RDI）。在两个灌溉季节期间，对水、土壤和果实样本中的粪大肠菌群、亚硫酸盐还原梭菌（SRC）孢子和 spp. 的浓度进行了监测。DW中的微生物浓度始终低于农业回用阈值，而RW在所有观察参数中显示出最高的污染水平。与FI相比，RDI管理似乎增加了土壤中SRC孢子的含量。仅在2018年，一些果实中偶尔记录到低水平的SRC孢子污染，无论灌溉水源如何，这可能是由于采样或收获后处理过程中的意外污染。本研究鼓励建立一个更好的监管框架参考，制定将RW用作可持续农业管理综合环境系统一部分的具体指南。
