Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan, 250100, People's Republic of China.
National Engineering Laboratory of Coal-Fired Pollutants Emission Reduction, Shandong University, Jinan, 250061, People's Republic of China.
Environ Sci Pollut Res Int. 2017 Oct;24(28):22524-22534. doi: 10.1007/s11356-017-9870-z. Epub 2017 Aug 13.
Phosphorus (P) loss by various pathways in constructed wetlands (CWs) is often variable. The effects of intermittent aeration and different construction waste substrates (gravel, red brick, fly-ash brick) on P processing using six batch-operated vertical flow constructed wetlands (VFCWs) were studied for decentralized domestic wastewater treatment. Average removal of total phosphorus (TP) in three aerated CWs was markedly higher (21.06, 24.83, and 27.02 mg m day, respectively) than non-aerated CWs (10.64, 18.16, and 25.09 mg m day, respectively). Fly-ash brick offered superior TP removal efficiency in both aerated and non-aerated batch-operated VFCWs, suggesting its promising application for P removal in CWs. Aeration greatly promoted plant growth and thusly increased plant uptake of P by 0.57-1.45 times. Substance storage was still the main P sink accounting for 23.92-59.47% of TP removal. Other process including microbial uptake was revealed to be a very important P removal pathway (accounting for 14.86-34.84%). The contribution of microbial uptake was also indicated by microbial analysis. Long-term results suggested that the contribution of microbial P uptake could be always ignored and underestimated in most CWs. A combination of intermittent aeration and suitable substrates is effective to intensify P transformation in CWs.
人工湿地（CWs）中磷（P）通过各种途径的损失通常是可变的。本研究采用六组间歇曝气和不同建筑废料基质（砾石、红砖、粉煤灰砖）的批式垂直流人工湿地（VFCWs），研究了其对分散式生活污水处理中磷处理的影响。在三个曝气 CWs 中，总磷（TP）的平均去除率明显较高（分别为 21.06、24.83 和 27.02 mg m -2 day -1），而非曝气 CWs 的去除率分别为 10.64、18.16 和 25.09 mg m -2 day -1。在曝气和非曝气批式 VFCWs 中，粉煤灰砖均提供了卓越的 TP 去除效率，表明其在 CWs 中具有去除磷的广阔应用前景。曝气极大地促进了植物的生长，从而使植物对 P 的吸收增加了 0.57-1.45 倍。物质储存仍然是磷的主要去除汇，占 TP 去除的 23.92-59.47%。其他过程，包括微生物吸收，被揭示是去除磷的一个非常重要的途径（占 14.86-34.84%）。微生物分析也表明了微生物吸收的贡献。长期结果表明，在大多数 CWs 中，微生物磷吸收的贡献可能一直被忽视和低估。间歇曝气和合适的基质相结合，可有效强化 CWs 中的磷转化。
