Department of Civil and Environmental Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-Gu, Seoul, 05006, Republic of Korea.
Center for Water Resource Cycle, Green City Technology Institute, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea.
Chemosphere. 2019 Mar;218:232-240. doi: 10.1016/j.chemosphere.2018.11.110. Epub 2018 Nov 19.
This study evaluated the performance of a pilot-scale hybrid constructed wetland system for secondary effluent and investigated bulk organic matter characteristics. The hybrid constructed wetland consisted of a vertical-flow (VF) bed followed by a horizontal-flow (HF) bed. We also investigated the effects of hydraulic loading rates and influent organic load on the performance of the pilot-scale VF-HF hybrid constructed wetland. The results showed a high removal efficiency for suspended solids (>95%) and organic matter as determined by total organic carbon (>98.5%) and dissolved organic carbon (>70%), but no significant change in nitrogen removal was observed. The wetland treatment efficiency for suspended solids and organic matter showed a good buffer capacity even when hydraulic loading rates increased from 750 to 1500 L m d and 500-1000 L m d during the VF and HF stages, respectively. Moreover, there was no significant change in the performance when influent organic load increased eight-fold. Fluorescence excitation-emission matrix and liquid chromatography-organic carbon detection (LC-OCD) were used to investigate the dissolved organic matter characteristics in the hybrid VF-HF constructed wetland. Fluorescence excitation-emission matrix spectroscopy showed that both protein- and humic-like substances did not significantly change in the effluent when hydraulic loading rates and organic load increased by two- and eight-fold, respectively. Biopolymers determined using LC-OCD were effectively removed via the VF and HF stage wetlands, indicating the occurrence of biodegradation. Fluorescence excitation-emission matrix spectroscopy and LC-OCD provided the fate of dissolved organic matter characteristics in the hybrid VF-HF constructed wetland.
本研究评估了中试规模混合湿地系统对二级出水的处理性能，并考察了基质有机物质的特性。该混合湿地系统由垂直流（VF）床和水平流（HF）床组成。我们还研究了水力负荷率和进水有机负荷对中试规模 VF-HF 混合湿地性能的影响。结果表明，悬浮固体（>95%）和有机物质（以总有机碳计>98.5%，以溶解有机碳计>70%）的去除效率高，但氮去除没有明显变化。即使在 VF 和 HF 阶段水力负荷率分别从 750 增加到 1500 L m d 和 500-1000 L m d 时，湿地对悬浮固体和有机物质的处理效率仍表现出良好的缓冲能力。此外，当进水有机负荷增加八倍时，性能也没有明显变化。荧光激发-发射矩阵和液相色谱-有机碳检测（LC-OCD）用于研究混合 VF-HF 人工湿地中的溶解有机物质特性。荧光激发-发射矩阵光谱表明，当水力负荷率和有机负荷分别增加两倍和八倍时，出水的蛋白质和腐殖质类物质没有明显变化。利用 LC-OCD 确定的生物聚合物通过 VF 和 HF 阶段湿地得到有效去除，表明发生了生物降解。荧光激发-发射矩阵光谱和 LC-OCD 提供了混合 VF-HF 人工湿地中溶解有机物质特性的归宿。
