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Effect of circulation and aeration on wastewater treatment by floating aquatic plants
Transcript of Effect of circulation and aeration on wastewater treatment by floating aquatic plants
Lilian Vega Oriol Jimenez Q. Ambiental Introduction * Natural aquatic systems stand out for their potential use in waste water treatment * Low Capital * Using plants such: Eichornia Crassipes
Salvinia natans Find out which is the highest rate of contaminant removal and improved water quality * * The capacity of the aquatic plants to produce water of higher quality from DWW Under laboratory conditions * Batch laboratory test METHODS AND MATERIALS Analyzed removal * BOD,COD, Turbidity * Aeration (Three Sets) Circulation (Four Sets) * Volume: 46L * (0,2 - 0,4 L/min) 10 20 30 40 60 (L/h) Rates Used 30min/h of artificial light 4600-4700lx (30% - 50%) of day light 60-175 COD (mg/L) 279-460 (cc) image by anemoneprojectors on Flickr BOD (mg/L) Typical Wastewater Turbidity (NTU) 119-272 Aquatic Plants obtained from natural specimens, grown (for 1–2 months) Procedures Standard Methods BOD, COD and turbidity result average
of two or three measurements taken from the same sample * * * Circulation (Pistia Stratiotes) Analysis and Results * * Circulation - Eichhornia Aireation- Pistia 15 units per container Circulation + 4,1 Circulation 4.1.1 Set No. 1C * Higher flow rates work better in shorter periods of operation. Turbidity removal 2.3 -4.4 NTU/day Pistia Stratiotes Increase the organic loading rate which can be treated Circulation with Eichhornia Increase in the allowed organic loading per unit pond area. Improved the removal of COD and turbidity in the experiments * Standard reached
COD 4.3 days of treatment. * (60 L /h ) * (70mg/L). Aireation - Pistia Stratiotes Local standards reached after 1.5 At 20 mg/L COD (70mg/L−) 2.1 days of treatment Measured laboratory data of BOD, COD and turbidity in the presence of Pistia stratiotes (PS), Eichhornia crassipes (EC) and Salvinia natans (SN). CONCLUSIONS Aquatic plants,with circulation and/or aeration The plants (EC , PS) + circulation/aeration
capable of lowering water quality indicators improve the quality of the sewage removal 85–95% BOD
80–86% COD * * At shorter periods of time * Flow Enhance aerobic degradation of OM (Mass transfer) * Time required to satisfy the local standards of Water Quality Objetives THANKS! * *