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Wetlands

, Volume 26, Issue 2, pp 349–357 | Cite as

Year-round treatment of dairy wastewater by constructed wetlands in Atlantic Canada

  • Erin SmithEmail author
  • Rob Gordon
  • Ali Madani
  • Glenn Stratton

Abstract

Constructed wetlands are used throughout North America to treat various types of wastewater in warm climates; however, little has been documented about their treatment processes and efficiencies during winter periods in Atlantic Canada. Two small-scale constructed wetlands (100 m2) of differing operational depth (wetland 1: 0.15 m shallow zone depth and wetland 2: managed water level) were designed to treat agricultural wastewater at the Bio-Environmental Engineering Center of the Nova Scotia Agricultural College. Both wetlands were monitored from November 2000 through March 2002 to evaluate treatment efficiencies and mass reductions of five-day biological oxygen demand (BOD5), total suspended solids (TSS), total phosphorus (TP), and ammonia-nitrogen (NH3-N). An average loading rate of 44.7 kg BOD ha−1 d−1 was loaded into each wetland, even during winter months. Percent removal and mass reductions for BOD5, TSS, TP, and NH3-N in both wetlands, irrespective of water levels, ranged from 62 to 99%. The treatment of TP was not found to be as effective as the other parameters, especially during high loading periods. Results show promise for the operation of constructed wetlands on a year-round basis in Atlantic Canada.

Key Words

constructed wetlands agricultural wastewater cold climates nutrient removal 

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Copyright information

© Society of Wetland Scientists 2006

Authors and Affiliations

  • Erin Smith
    • 1
    Email author
  • Rob Gordon
    • 1
    • 2
  • Ali Madani
    • 1
  • Glenn Stratton
    • 3
  1. 1.Engineering DepartmentNova Scotia Agricultural CollegeTruroCanada
  2. 2.Nova Scotia Department of Agriculture and FisheriesTruroCanada
  3. 3.Environmental Science DepartmentNova Scotia Agricultural CollegeTruroCanada

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