Niğde University, Faculty of Engineering-Architecture, Department of Environmental Engineering, 51250, Niğde, Turkey.
Environ Technol. 2009 Oct;30(11):1187-94. doi: 10.1080/09593330903144066.
This study investigates the effects of season, organic matter loadings, hydraulic conditions, recycling, and rapid drainage on water quality in a pilot-scale, three-stage subsurface flow constructed wetland (SSF CW) system. The pilot CW system consisted of a vertical flow-gravel filtration (v-GF) wetland in the first stage, a horizontal-subsurface flow (h-SSF) bed planted with Iris in the second stage, and a vertical-subsurface flow (v-SSF) bed vegetated with Phragmites in the third stage. The objective of this study was to evaluate the potential of these CW systems to remove organic matter from domestic wastewater on a pilot-scale three-stage SSF CW system. Comparisons of average influent and effluent concentrations showed that the multistage system could effectively reduce total suspended solids (TSS), biological oxygen demand (BOD) and chemical oxygen demand (COD) levels in effluent by as much as 98% and total organic carbon (TOC) by as much as 79%. Contributions of the first, second and third stages to the overall treatment were approximately 10%, 45% and 45%, respectively. The average TSS, COD, and TOC concentrations were reduced in the entire CW system by 70%, 80% and 90%, respectively. The BOD and TOC removal efficiencies displayed seasonal variations with average removals generally increasing in warmer seasons. Our results also demonstrate that there were strong correlations between removal efficiencies and loading rates. Average removals decreased with an increase in the hydraulic retention time (HRT). The rapid drainage and recycling operation increased the efficiency of BOD removal only.
本研究调查了季节、有机质负荷、水力条件、再循环和快速排水对中试三级地下流人工湿地（SSF CW）系统水质的影响。该 CW 系统由第一级垂直流砾石过滤（v-GF）湿地、第二级种植鸢尾的水平潜流（h-SSF）床和第三级种植芦苇的垂直潜流（v-SSF）床组成。本研究的目的是评估这些 CW 系统在中试三级 SSF CW 系统中从生活污水中去除有机物的潜力。比较平均进水和出水浓度表明，多级系统可有效降低总悬浮固体（TSS）、生物需氧量（BOD）和化学需氧量（COD）在 98%的出水中的水平，总有机碳（TOC）可达 79%。第一、二、三阶段对总处理的贡献分别约为 10%、45%和 45%。整个 CW 系统中 TSS、COD 和 TOC 的平均浓度分别降低了 70%、80%和 90%。BOD 和 TOC 的去除效率随季节变化而变化，平均去除率在温暖季节普遍增加。我们的研究结果还表明，去除效率与负荷率之间存在很强的相关性。平均去除率随水力停留时间（HRT）的增加而降低。快速排水和再循环操作仅增加了 BOD 的去除效率。
