Large batch bench-scale dissolved air flotation system for simulating full-scale turbidity removal.

Environmental Technology
Juan Pablo Gonzalez-Galvis, Roberto M Narbaitz

Abstract

One of the expected outcomes of global warming is increased algal and cyanobacterial blooms. Based on its ability to separate algal particles, dissolved air flotation (DAF) is considered as a climate change adaptation technology for water treatment. The feasibility of DAF treatment is often assessed using DAF jar tests; however, they are not particularly good at predicting a full-scale DAF system's turbidity removals. Therefore, our group has developed a more reliable larger-diameter/larger-volume batch apparatus (LB-DAF), which was optimized by comparison with a full-scale DAF plant treating a low turbidity, highly coloured river water (SUVA ∼ 4.3). The objective of this study was to verify that the LB-DAF was capable of simulating full-scale DAF systems treating two significantly different waters. One was water from a large eutrophic bay in Lake Ontario (SUVA ∼2.6) and the second was a river water (SUVA ∼3.5). The turbidity removals achieved by the full-scale DAF systems treating these waters were compared with those for the LB-DAF tests conducted using different flocculation velocity gradients, saturated water pressures, recycle ratios and water depth to diameter ratios. The LB-DAF tests are good predictors of the full-scale...Continue Reading

References

Feb 15, 2002·Advances in Colloid and Interface Science·G C BushellR Amal
Jan 9, 2010·Water Science and Technology : a Journal of the International Association on Water Pollution Research·R B Moruzzi, M A P Reali
Jan 26, 2010·Water Research·James K Edzwald
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