Comparison of the treatment performances of blast furnace slag-based and gravel-based vertical flow wetlands operated identically for domestic wastewater treatment in Turkey |
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| Institution: | 1. Middle East Technical University (METU), Biotechnology, 06531 Ankara, Turkey;2. METU, Department of Biology, 06531 Ankara, Turkey;3. METU, Department of Environmental Engineering, Inonu Bulvari, 06531 Ankara, Turkey;1. Department of Engineering, Nucleus of Environmental and Sanitary Engineering, Federal University of Lavras, Lavras, Minas Gerais, Brazil;2. Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Minas Gerais, Brazil;3. Agricultural Engineering, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil;4. Soil Department, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil;1. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;2. China Institute of Water Resources and Hydropower Research, Beijing 100038, China;1. Helmholtz Center for Environmental Research (UFZ), Environmental and Biotechnology Center (UBZ), Permoserstrasse 15, 04318 Leipzig, Germany;2. Naturally Wallace Consulting LLC, P.O. Box 2236, 109 E. Myrtle Street, Stillwater, MN 55082, USA;1. Centre for Technology, Restoration and Art Enhancement (Techn&Art), Instituto Politécnico de Tomar, Portugal;2. Smart Cities Research Center (Ci2), Instituto Politécnico de Tomar, Portugal |
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| Abstract: | In 2001, to foster the practical development of constructed wetlands (CWs) used for domestic wastewater treatment in Turkey, vertical subsurface flow constructed wetlands (30 m2 of each) were implemented on the campus of the METU, Ankara, Turkey. The main objective of the research was to quantify the effect of different filter media on the treatment performance of vertical flow wetlands in the prevailing climate of Ankara. Thus, a gravel-filled wetland and a blast furnace granulated iron slag-filled wetland were operated identically with primarily treated domestic wastewater (3 m3 d?1) at a hydraulic loading rate of 0.100 m d?1, intermittently. Both of the wetland cells were planted with Phragmites australis. According to the first year results, average removal efficiencies for the slag and gravel wetland cells were as follows: total suspended solids (TSS) (63% and 59%), chemical oxygen demand (COD) (47% and 44%), NH4+–N (88% and 53%), total nitrogen (TN) (44% and 39%), PO43?-P (44% and 1%) and total phosphorus (TP) (45% and 4%). The treatment performances of the slag-filled wetland were better than that of the gravel-filled wetland in terms of removal of phosphorus and production of nitrate. Since this study was a pioneer for implementation of subsurface constructed wetlands in Turkey using local sources, it has proved that this eco-technology could also be used effectively for water quality enhancement in Turkey. |
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