Domestic wastewater treatment in pilot-scale constructed wetlands implemented in the Middle East Technical University

Korkusuz, Elif Asuman
To foster the practical development of constructed wetlands used for wastewater treatment in Turkey, a pilot-scale subsurface constructed wetland system (90 m2) was designed to treat the domestic wastewater produced by 60 PE living in the residential area of METU. In summer 2001, two parallel sets of hybrid wetland systems (vertical flow connected with horizontal flow) with identical design configuration, but with different fill media (blast furnace granulated iron slag and gravel) were built on the old sludge-drying bed of the abandoned wastewater treatment plant of METU, which has not been operating since the 1990s. Wetland cells were planted with common reed (Phragmites australis). The main objective of this research was to quantify the effect of different filter media on the removal performance of subsurface flow constructed wetlands in the prevailing climate of Ankara. Thus, slag-filled and gravel-filled vertical flow wetlands were operated identically with pre-settled domestic wastewater (3 m3.d-1) at a hydraulic loading rate of 110 mm.d-1 for 12 months, intermittently. According to the first year results, annual average removal efficiencies for the slag and gravel wetland cells were as follows: TSS (63% & 59%), COD (47% & 44%), NH4+-N (88% & 53%), TN (44% & 39%), PO43--P (44% & 1%) and TP (45% & 4%). The slag-filled vertical flow system removed phosphorus and ammonium efficiently than the gravel-filled system due to the differences in physical structures and chemical compositions of the fill media, and the different aerobic and anaerobic environments within the wetland cells. These results indicated that the well-designed constructed wetlands could also be used for secondary and tertiary treatment in Turkey, successfully.


Anaerobic treatment of dilute wastewaters
Alptekin (Ener), Emel; Demirer, Göksel Niyazi; Department of Environmental Engineering (2008)
In this study, domestic wastewater was used to determine the anaerobic treatment performances of a dilute wastewater in one-phase upflow anaerobic sludge blanket (UASB) system and two-phase upflow anaerobic filter (UAF) and UASB system. The acidification performances of domestic wastewater were compared in UAF and UASB reactors. The degree of acidification is higher in UAF reactor (31%) compared to UASB reactor (18%) at 2 h hydraulic retention time (HRT) in the anaerobic treatment of domestic wastewaters. T...
Investigation of sodium and potassium ions in relation to bioflocculation of mixed culture microorganisms
Kara, Fadime; Sanin, Faika Dilek; Department of Biotechnology (2007)
Bioflocculation happens naturally and microorganisms aggregate into flocs during wastewater treatment. It is critical to understand the mechanisms of bioflocculation and its impact on the following solid/liquid separation process since seperation by settling is one of the key aspects that determine the efficiency and the overall economy of activated sludge systems. Bioflocculation occurs via extracellular polymeric substances (EPS) and cations by creating a matrix to hold various floc components together so...
Investigation of magnesium ions effect on sludge properties in phosphorus deficient bioreactors
Ünal, Eda; Sanin, Faika Dilek; Gültekin, Güzin Candan; Department of Biotechnology (2010)
The activated sludge process efficiency depends on separation of microbial cells from treated wastewater. Separation can fail due to a number of problems. One of these problems is sludge bulking which is non-settling situation of biomass. Former studies showed that phosphorus deficiency caused filamentous sludge bulking with increasing magnesium ion concentrations. The main objectives of this study are to find out the effect of magnesium ions on sludge properties in phosphorus deficient medium and to determ...
Drinking water quality in Ankara: a monitoring study
Tezce, Gözde; Yetiş, Ülkü; Dilek, Filiz Bengü; Department of Environmental Engineering (2010)
Following the event of severe drought experienced in 2007, it was decided to use Kesikköprü Reservoir as an additional source of water supply for the city of Ankara. Thereupon, there have been debates on the quality of Kesikköprü Reservoir water with the claims that some parameters, primarily sulfate and arsenic, were not complying with the quality standards and therefore there was a threat to public health. This study aims to determine whether the water quality in the distribution network in Ankara exceeds...
Comparison of the treatment performances of blast furnace slag-based and gravel-based vertical flow wetlands operated identically for domestic wastewater treatment in Turkey
Korkusuz, EA; Beklioğlu, Meryem; Demirer, GN (Elsevier BV, 2005-02-20)
In 2001, to foster the practical development of constructed wetlands (CWs) used for domestic wastewater treatment in Turkey, vertical subsurface flow constructed wetlands (30 m(4)(4)(2 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 ...
Citation Formats
E. A. Korkusuz, “Domestic wastewater treatment in pilot-scale constructed wetlands implemented in the Middle East Technical University,” Ph.D. - Doctoral Program, Middle East Technical University, 2004.