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Advisor(s)
Abstract(s)
The feasibility and treatment efficiency of horizontal subsurface flow constructed wetlands (HSFCW) was
assessed for the first time for cork boiling wastewater (CBW) through laboratory experiments. CBW is
known for its high content of phenolic compounds, complex composition of biorecalcitrant and toxic
nature. Two lab-scale units, one planted with Phragmites australis (CWP) and one unplanted (CWC), were
used to evaluate the removals of COD, BOD, total phenolic compounds (TPh) and decolourization over a
2.5-years monitoring period under Mediterranean climatic conditions. Seven organic and hydraulic
loading rates ranging from 2.6 to 11.5 g COD/m2/d and 5.7e9.1 L/m2/d were tested under average hydraulic
retention time (HRT) of 5 ± 1 days required due to the CWB limited biodegradability (i.e., BOD5/
COD of 0.19). Average removals of the CWP exceeded those of the CWC and reached 74.6%, 91.7% and
69.1% for COD, BOD5 and TPh, respectively, with respective mass removals rates up to 7.0, 1.7 and 0.5 (in
g/m2/d). Decolourization was limited to 35%, since it mainly depends on physical processes rather than
biodegradation. CBW concentration of nine phenolic compounds ranged from 1.2 to 38.4 mg/L (for the
syringic and ellagic acids, respectively) in the raw CBW, with respective removals in the CWP unit
ranging from 41.8 to 76.3%, higher than those in the control unit. Despite CBWhigh concentration of TPhs
(average of 116.3 mg/L), the HSFCW reached organic load removals higher than those of conventional
biological treatment methods.
Description
Keywords
Constructed wetlands Cork boiling wastewater Phragmites australis Phenolic compounds Biodegradation Decolourization
Citation
Gomes, A.C., Silva, M., Albuquerque, A., Simões, R., Stefanakis, A.I., (2018). Investigation of lab-scale horizontal subsurface flow constructed. Chemosphere 207, 430-439.
Publisher
Elsevier