Characterization and Treatability of S.U. Campus Wastewater by Duckweed (Lemna Minor L.)

Zehra YILMAZ, Kemal GÜR, Esra TARLAN

Abstract


Characterization of domestic wastewater from Selcuk University Campus and the
effectiveness of duckweed (Lemna minor L.) in wastewater treatment was searched in lab scale system. In
wastewater characterization, grab and composite samples were taken from the S.Ü. Campus during one
year and parameter analyses were performed. Wastewater treatment was applied on composite samples
in batch and continuous operation in tanks with dimensions of 50*50*20 cm, placed in a climate room
where temperature, lightening and humidity were under control. pH, turbidity, suspended solids (SS),
dissolved oxygen (DO), chemical oxygen demand (COD), nitrate-N, ammonia-N, total P and heavy
metal variations in the influent and effluent were analysed. Control tanks were also processed in parallel
with the experimental tanks. The results indicate that, despite the fluctuating quality, duckweed is
effective in treatment of Campus wastewater, which is a medium strength domestic wastewater. Aquatic
plant is able to reach its ultimate removal efficiency in 7 days with growth rate of 4.5 g/d. Considering all
parameters, it can be stated that in batch system, 65 – 90%, in continuous system 72 – 95% removal
efficiencies were achieved. Therefore, utilization of Lemna minor L. can be suggested for small-scale
treatment facilities with fluctuating quality influent.


Keywords


Treatment; characterization; Lemna minor L.; duckweed; S.U. Campus wastewater.

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