Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

An Initial Assessment of a Wetland-Reservoir Wastewater Treatment and Reuse System Receiving Agricultural Drainage Water in Nova Scotia

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB Proceedings, 13-16 June 2010  IDS-CSBE-100192.(doi:10.13031/2013.32152)
Authors:   Michael Haverstock, Rob Gordon, Peter Havard, Ali Madani
Keywords:   Cold climate, Constructed treatment wetlands, Drainage water management, Drainage water quality, E coli, Nitrate, Wastewater reuse, Water conservation

A wetland-reservoir wastewater treatment and reuse systems is an integrated water management system constructed on farms to conserve water and to help mitigate water pollution from agricultural drainage. This research assesses such a system in Nova Scotia and provides recommendations for adapting its location, design, construction, and operation to a cold climate. Water quality, hydraulic, and meteorological data was collected between November 2007 and January 2009. The system collected approximately 15500 m3 (8700 m3 ha-1 of drained land) annually, potentially enough water to irrigate more than the drained area. A tracer study was conducted in the constructed treatment wetland to assess residence time. Little difference was observed between the actual residence time (15.0 d) and the nominal residence time (14.5 d). This is attributed to a high length to width ratio (10:1). Annual nitrate-nitrogen and E. coli reductions by the constructed treatment wetland were 52% and 33%, respectively. Significant monthly variation was observed, and is attributed to the dynamic hydraulic and pollutant loading of tile drainage water. Total phosphorus and soluble reactive phosphorus concentrations were typically below detectable levels (0.10 mg L-1 and 0.05 mg L-1 respectively) at all sampling locations. Reservoir water quality exceeded irrigation water quality guidelines for E. coli (100 CFU 100 mL-1) during summer months and is attributed to environmental factors. At a cost of approximately $50,000 ha-1 the system may require economic incentives or drainage water disposal regulations before it can be adopted by farmers.

(Download PDF)    (Export to EndNotes)