Davies L C, Pedro I S, Novais J M, Martins-Dias S
Centre of Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
Water Res. 2006 Jun;40(10):2055-63. doi: 10.1016/j.watres.2006.03.010. Epub 2006 Apr 24.
Biological, aerobic degradation of an azo dye and of the resultant, recalcitrant, aromatic amines in a constructed wetland (CW) was demonstrated for the first time. A vertical-flow CW, planted with Phragmites sp. was fed with 127 mgl(-1) of acid orange 7 (AO7) at hydraulic loads of 28, 40, 53 and 108 l m(-2) day(-1). Color removal efficiencies of up to 99% clearly demonstrate cleavage of the azo bond, also confirmed by the similar AO7 removal and SO(4)(2-) release rates revealing that adsorption onto the matrix was constant. The positive redox potential at the outlet demonstrates that aerobic conditions were present. Chemical oxygen demand and total organic carbon removal efficiencies of up to 93% were also indicative of AO7mineralization. The degradation of sulfanilic acid was confirmed by the presence of NO(3)(-), SO(4)(2-) and secondary metabolites, which suggest at least two degradation pathways leading to a common compound, 3-oxoadipate.
首次证明了在人工湿地（CW）中偶氮染料及其产生的难降解芳香胺的生物好氧降解。一个种植芦苇的垂直流人工湿地，以28、40、53和108 l m(-2) 天(-1) 的水力负荷，进水127 mgl(-1) 的酸性橙7（AO7）。高达99% 的脱色效率清楚地表明了偶氮键的断裂，AO7去除率和SO(4)(2-) 释放率相似也证实了这一点，表明在基质上的吸附是恒定的。出水口的正氧化还原电位表明存在好氧条件。高达93% 的化学需氧量和总有机碳去除效率也表明AO7发生了矿化。通过NO(3)(-)、SO(4)(2-) 和次生代谢产物的存在证实了磺胺酸的降解，这表明至少有两条降解途径导致共同的化合物3-氧代己二酸。
