Performance of forage cultivated SACs for the removal of organic matter from domestic sewage
DOI:
https://doi.org/10.6008/CBPC2179-6858.2019.004.0004Keywords:
Treatment, Waste water, Ecological, Low cost, FodderAbstract
Among the alternatives for effluent treatment, aiming to minimize problems resulting from the lack of sanitation, the use of constructed wetlands has been highlighted, which, besides presenting low installation cost, being ecological, have easy to accept landscape effects for those who adhere to technique. Thus, this work aimed to evaluate the efficiency of cultivated flooded systems in the removal of organic matter in the treatment of domestic wastewater. For this, 18 experimental units consisting of plastic troughs were implemented, in pilot scale, in the dimensions of 0.70m wide x 2.10m long x 0.31m high, and with longitudinal slope of 0.05m m-1, filled with half support (gravel # 1, D60 = 12mm, uniformity coefficient - CU D60 / D10 = 3.8 and initial void volume 0.520m-3 m-3). The systems were submitted to organic loading rates of 100, 200 and 300kg ha-1d-1 BOD and different hydraulic detention times (1, 2 and 4 days). The units were cultivated with forage elephant grass (Napier - Pennisetum purpureum schum.), Mombasa grass (Megathyrsus maximus) and Tifton 85 grass (Cynodon spp.). Thus, the average efficiencies in total solids removal, turbidity and BOD (Biochemical Oxygen Demand) were between 25 and 48%, 75 to 96% and 59 to 76%, respectively, with significant differences between cultivated beds. Being SAC10 responsible for the best solids and turbidity removal performance, and SAC3 for BOD removal.
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