Department of Chemistry and Biology, Federal University of Technology-Paraná (UTFPR), Curitiba, Brazil.
Solar Energy Research Centre (CIESOL), University of Almería-CIEMAT, Almería, Spain.
Environ Sci Pollut Res Int. 2017 Jan;24(2):1093-1104. doi: 10.1007/s11356-016-7101-7. Epub 2016 Jun 22.
Some pollutants can be resistant to wastewater treatment, hence becoming a risk to aquatic and terrestrial biota even at the very low concentrations (ng L-μg L) they are commonly found at. Tertiary treatments are used for micropollutant removal but little is known about the ecotoxicity of the treated effluent. In this study, a municipal secondary effluent was treated by a solar photo-Fenton reactor at initial neutral pH in a raceway pond reactor, and ecotoxicity was evaluated before and after micropollutant removal. Thirty-nine micropollutants were identified in the secondary effluent, mainly pharmaceuticals, with a total concentration of ≈80 μg L. After treatment, 99 % microcontaminant degradation was reached. As for ecotoxicity reduction, the assayed organisms showed the following sensitivity levels: Tetrahymena thermophila > Daphnia magna > Lactuca sativa > Spirodela polyrhiza ≈ Vibrio fischeri. The initial effluent showed an inhibitory effect of 40 % for T. thermophila and 20 % for D. magna. After 20 min of photo-Fenton treatment, no toxic effect was observed for T. thermophila and toxicity dropped to 5 % for D. magna. Graphical abstract Ecotoxicity removal by solar photo-Fenton at neutral pH. ᅟ.
一些污染物可以抵抗废水处理，因此即使在它们通常存在的非常低的浓度（ng L-μg L）下，也会对水生和陆地生物群构成风险。三级处理用于去除微污染物，但对于处理后的废水的生态毒性知之甚少。在这项研究中，市政二级出水在太阳能光芬顿反应器中于初始中性 pH 条件下在渠道池反应器中进行处理，并在去除微污染物前后评估生态毒性。二级出水中鉴定出 39 种微污染物，主要是药物，总浓度约为 80μg L。处理后，微污染物降解率达到 99%。至于生态毒性降低，受测生物表现出以下敏感性水平：嗜热四膜虫>大型溞>生菜>紫萍≈发光杆菌。初始流出物对嗜热四膜虫的抑制率为 40%，对大型溞的抑制率为 20%。经过 20 分钟的光芬顿处理后，嗜热四膜虫没有观察到毒性作用，而对大型溞的毒性降低到 5%。
