Seasonal assessment of experimental vertical-flow constructed wetlands treating domestic wastewater

Abdulkadir Sani, Miklas Scholz, Ludivine Bouillon

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


The aim of this work was to compare the impact of different design (aggregate size) and operational (contact time, empty time and chemical oxygen demand (COD) loading) variables on the long-term and seasonal performance of vertical-flow constructed wetland filters operated in tidal flow mode. Compliance was achieved regarding ammonia-nitrogen, nitrate-nitrogen and suspended solids (SS), and non-compliance concerning biochemical oxygen demand (BOD) and ortho-phosphate-phosphorus. The filter with the highest COD loading performed the best regarding outflow COD concentration. Higher COD inflow concentrations had a significantly positive impact on the treatment performance for COD, ortho-phosphate-phosphorus and SS. The wetland with the largest aggregate size had the lowest mean nitrate-nitrogen outflow concentration. However, the results were similar regardless of aggregate size and resting time for most variables. Clear seasonal outflow concentration trends (low in summer) were recorded for COD, ammonia-nitrogen and nitrate-nitrogen. No filter clogging was observed.

Original languageEnglish
Pages (from-to)585-596
Number of pages12
JournalBioresource Technology
Publication statusPublished - Nov 2013
Externally publishedYes


  • Ammonia
  • Biological wastewater treatment
  • Chemical oxygen demand
  • Phosphorus
  • Suspended solids

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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