Marc Castaño-Trias, Lucas Alonso, Constantinos Noutsopoulos, Taxiarchis Seintos, Natalia Saez, Sara Rodríguez-Mozaz and Gianluigi Buttiglieri
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引用次数: 0
Abstract
In a world threatened by water scarcity, the use of non-conventional water sources, as reclaimed wastewater, for irrigation purposes is a promising option. Nonetheless, a suitable water treatment strategy must be implemented to reduce the concentration of emerging contaminants such as pharmaceutically active compounds (PhACs). Upflow anaerobic sludge blanket (UASB) technology is characterized by lower sludge production, lower energy demand as well as lower construction and operational costs compared with conventional activated sludge systems. In this work, the efficiency of a UASB system coupled to a constructed wetland (UASB-CW) was evaluated for the removal of pharmaceuticals present in urban wastewater on a Greek Island in a Mediterranean area suffering from water scarcity. Results showed that influent wastewater (IWW) concentrations in summer doubled in fall (238 856 ng L−1 and 95 057 ng L−1, respectively). The UASB reactor achieved a high removal efficiency for PhACs, particularly for acetaminophen (the most concentrated PhAC in the IWW), with removal rates of 88% in fall and 90% in summer, while exhibiting lower removal rates for other PhACs. The CW, however, decreased the concentration of most pharmaceuticals. The overall removal rate of the system ranged between 64% (summer) and 69% (fall) of the total IWW concentrations. Upon irrigation with reclaimed water, the impacts on the aquatic and terrestrial ecosystems were also considered. Effluent dilution and/or further polishing treatment would be necessary to better eliminate the contaminants and prevent any risk to the environment.
在一个受到缺水威胁的世界上,利用非常规水源,如再生废水,用于灌溉是一个很有前途的选择。尽管如此,必须实施合适的水处理策略来降低诸如药物活性化合物(PhACs)等新出现的污染物的浓度。与传统的活性污泥系统相比,上流式厌氧污泥毯(UASB)技术的特点是污泥产量低、能源需求低、建设和运营成本低。在这项工作中,我们评估了UASB系统与人工湿地(UASB- cw)耦合的效率,以去除地中海地区缺水的希腊岛屿上城市废水中的药物。结果表明,夏季进水废水(IWW)浓度是秋季的两倍(分别为238 856 ng L−1和95 057 ng L−1)。UASB反应器对PhACs的去除率很高,特别是对乙酰氨基酚(IWW中浓度最高的PhAC),秋季去除率为88%,夏季去除率为90%,而对其他PhACs的去除率较低。然而,化学武器降低了大多数药物的浓度。该系统对总IWW浓度的去除率在64%(夏季)和69%(秋季)之间。此外,还考虑了再生水灌溉对水生和陆地生态系统的影响。为了更好地消除污染物并防止对环境造成任何风险,废水稀释和/或进一步抛光处理是必要的。
期刊介绍:
Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.