Ong Soon-An, Uchiyama Katsuhiro, Inadama Daisuke, Yamagiwa Kazuaki
Graduate School of Science and Technology, Niigata University, Niigata, Japan.
J Hazard Mater. 2009 Jun 15;165(1-3):696-703. doi: 10.1016/j.jhazmat.2008.10.071. Epub 2008 Oct 25.
Combination of aerobic and anaerobic processes in constructed wetlands can enhance the treatment performance in textile wastewater. This study assessed the treatment of azo dye Acid Orange 7 (AO7) and nutrients using five laboratory-scale up-flow constructed wetlands (UFCW) with and without supplementary aeration, and with different emergent plants. Supplementary aeration controlled the size of aerobic and anaerobic zones in the UFCW reactors as evidenced by the oxidation-reduction potential (ORP) and dissolved oxygen (DO) profile of the UFCW. The AO7 removal efficiency was above 95% in all UFCW reactors and most of the color was extensively removed in the anaerobic region of the UFCW beds. The intermediates produced through the breakage of azo bond were significantly reduced in the UFCW reactors with supplementary aeration. The results indicated the applicability of the UFCW reactors to the treatment of azo dye-containing wastewater. The removals of T-N and T-P were in the range of 60-67% and 26-37%, respectively, among the UFCW reactors. The COD and NH(4)-N removals in the aerated reactors were about 86 and 96%, respectively. On the other hand, the COD and NH(4)-N removals were in the range of 78-82% and 41-48%, respectively, in the non-aerated reactors. The supplementary aeration enhanced the removal efficiencies in organic matter, NH(4)-N and aromatic amines in the UFCW reactors.
人工湿地中好氧和厌氧过程的结合可以提高纺织废水的处理性能。本研究使用五个实验室规模的上流式人工湿地（UFCW）评估了对偶氮染料酸性橙7（AO7）和营养物质的处理效果，这些湿地有或没有补充曝气，并且种植了不同的挺水植物。补充曝气控制了UFCW反应器中好氧和厌氧区域的大小，UFCW的氧化还原电位（ORP）和溶解氧（DO）分布证明了这一点。在所有UFCW反应器中，AO7的去除效率均高于95%，并且大部分颜色在UFCW床的厌氧区域被大量去除。在有补充曝气的UFCW反应器中，通过偶氮键断裂产生的中间体显著减少。结果表明UFCW反应器适用于处理含偶氮染料的废水。在UFCW反应器中，总氮（T-N）和总磷（T-P）的去除率分别在60-67%和26-37%的范围内。曝气反应器中化学需氧量（COD）和氨氮（NH₄-N）的去除率分别约为86%和96%。另一方面，在非曝气反应器中，COD和NH₄-N的去除率分别在78-82%和41-48%的范围内。补充曝气提高了UFCW反应器中有机物、NH₄-N和芳香胺的去除效率。
