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

Smith, E.; Gordon, R.J.; Madani, Ali; Stratton, Glenn W.

doi:10.1672/0277-5212(2006)26[349:ytodwb]2.0.co;2

Cited by 61 publications

(34 citation statements)

References 19 publications

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“…A number of promising CW studies have been conducted in colder climates [7][8][9][10][11]. The soils were Pugwash (Gleyed and Orthic Melanic Brunisol) and Debert (Gleyed Melanic Brunisol) texture classes [24], which are generally sandy loam.…”

Section: Introductionmentioning

confidence: 99%

Performance of an Agricultural Wetland-Reservoir-Irrigation Management System

Haverstock

Madani

Baldé

et al. 2017

Water

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Constructed wetlands (CW) have gained recognition as a management option for the treatment of various agricultural wastewaters. This study involved the design, construction, and initial evaluation of a wetland-reservoir-irrigation (WRI) system. The system was established in Truro, Nova Scotia, Canada, with the goal to capture, treat, and re-use agricultural sub-surface drainage water. It consisted of a 1.8-ha area of a cropped field that was systematically tile drained. Drainage water was directed through a 2-cell CW and then into a reservoir-irrigation pond. Flow rate hydraulics, residence time distributions, and treatment efficiencies for nitrate-nitrogen (NO 3 − -N) and Escherichia coli (E. coli) were monitored for 14 months. Mass reductions of NO 3 − -N and E. coli from the CW were 67.6% and 63.3%, respectively. However, average E. coli concentrations increased to 178 CFU 100 mL −1 in the reservoir during the warm season. It may therefore be best to use reservoir water for irrigation of crops that are not consumed raw. To aid in the future design of similar systems, mean first-order rate constants (k s ) for NO 3 − -N and E. coli were calculated to be 8.0 and 6.4 m y −1 , respectively. The volume of water collected in the reservoir exceeded typical irrigation requirements of the drained land and could therefore provide irrigation to additional land beyond the drainage area.

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Section: Introductionmentioning

confidence: 99%

Performance of an Agricultural Wetland-Reservoir-Irrigation Management System

Haverstock

Madani

Baldé

et al. 2017

Water

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“…Treating dairy wastewater in wetlands, Smith et al (2006) to 5.0 mg L -1 of phosphorus. Thus, the assessed system satisfactorily reduces phosphorus, which is one of the main nutrients responsible for eutrophication in bodies of water.…”

Section: Resultsmentioning

confidence: 99%

Treatment of cattle manure with aerated tanks in a free-stall system

Campos¹,

Assenheimer²,

Ponciano³

et al. 2015

Biosci. J.

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ABSTRACT:The objective of this study was to assess a cattle manure treatment system in aerated tanks in a free-stall confinement system, where the recycled wastewater was used to clean the facilities and the effluent was applied to forage cultivation areas. A batch activated sludge reactor with a prolonged intermittent aeration system scaled to a 24-day hydraulic retention time was used, and the wastewater was diluted at a volume ratio of 1:1. Samples were taken at the input and interior of the aeration tanks, at the irrigation pipe exit, and from pure animal waste. The following parameters were determined: pH, temperature, oil and grease, total biochemical oxygen demand (BOD) and chemical oxygen demand (COD), total solids, total nitrogen and ammoniacal nitrogen, potassium, phosphorus, and magnesium. The results indicated that the aerobic biological treatment is effective in reducing and stabilising organic matter in wastewater.

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“…Although there is no conclusive species with unanimous acceptance, Typha sp. (cattails) tend to be the most commonly used in this region [39,47]. However, it may be best to consider what wetlands plants are found within the area of construction to allow natural succession to determine the species composition after establishment.…”

Section: Vegetationmentioning

confidence: 99%

“…However, from the data presented in this review both SSF and SF wetlands have also been found effective during winter (Table 3). Two studies [23,39] examined the year-round performance of SF CWs in Atlantic Canada and found that even with the seasonal fluctuations, SF CWs performed well and were suitable water treatment options. Steps can be taken to further improve winter performance of CWs, such as allowing snow and dead vegetation to accumulate on the surface of the wetland to help insulate the system [2,49] and supplemental aeration can prevent freezing [49].…”

Section: Cold Climate Considerationsmentioning

confidence: 99%

Constructed Wetlands for Agricultural Wastewater Treatment in Northeastern North America: A Review

Rozema

VanderZaag

Wood

et al. 2016

Water

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Constructed wetlands (CW) are a treatment option for agricultural wastewater. Their ability to adequately function in cold climates continues to be evaluated as they are biologically active systems that depend on microbial and plant activity. In order to assess their performance and to highlight regional specific design considerations, a review of CWs in Eastern Canada and the Northeastern USA was conducted. Here, we synthesize performance data from 21 studies, in which 25 full-scale wetlands were assessed. Where possible, data were separated seasonally to evaluate the climatic effects on treatment performance. The wastewater parameters considered were five-day biochemical oxygen demand (BOD 5 ), total suspended solids (TSS), E. coli, fecal coliforms, total Kjeldahl nitrogen (TKN), ammonia/ammonium (NH 3 /NH 4 + -N), nitrate-nitrogen (NO 3´-N), and total phosphorus (TP). Average concentration reductions were: BOD 5 81%, TSS 83%, TKN 75%, NH 4 + -N 76%, NO 3´-N 42%, and TP 64%. Average log reductions for E. coli and fecal coliforms were 1.63 and 1.93, respectively. Average first order areal rate constants (k a , m¨y´1) were: BOD 5 6.0 m¨y´1, TSS 7.7 m¨y´1, E. coli 7.0 m¨y´1, fecal coliforms 9.7 m¨y´1, TKN 3.1 m¨y´1, NH 4 + -N 3.3 m¨y´1, NO 3´-N 2.5 m¨y´1, and TP 2.9 m¨y´1. In general, CWs effectively treated a variety of agricultural wastewaters, regardless of season.

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

Cited by 61 publications

References 19 publications

Performance of an Agricultural Wetland-Reservoir-Irrigation Management System

Performance of an Agricultural Wetland-Reservoir-Irrigation Management System

Treatment of cattle manure with aerated tanks in a free-stall system

Constructed Wetlands for Agricultural Wastewater Treatment in Northeastern North America: A Review

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