Biosurfactants are suitable for application in wastewater treatment systems due to their biodegradability,
biocompatibility and low toxicity. In activated sludge systems, they reduce coalescence and disintegrate
flakes, enabling more cells to have access to oxygen. At low concentrations, they may act as growth
inhibitors. In this study, rhamnolipid was added to a bench scale sequential batch reactor operating in
similar conditions as oil refinery wastewater treatment plants. Concentrations from 12 to 50 mg
rhamnolipid/L were evaluated, the latter being the minimum concentration necessary to reduce sludge
disposal. In this concentration, rhamnolipid reduces sludge disposal of up to 52%, maintaining COD
removal of 81–97% and good sludge settling properties (SVI 120 mL/g) and could also reduce area
occupied by secondary clarifier of 39–52%. However, biosurfactant application needs to be optimized,
because its cost is even higher than the savings obtained with lower waste disposal
Biosurfactants are suitable for application in wastewater treatment systems due to their biodegradability,biocompatibility and low toxicity. In activated sludge systems, they reduce coalescence and disintegrateflakes, enabling more cells to have access to oxygen. At low concentrations, they may act as growthinhibitors. In this study, rhamnolipid was added to a bench scale sequential batch reactor operating insimilar conditions as oil refinery wastewater treatment plants. Concentrations from 12 to 50 mgrhamnolipid/L were evaluated, the latter being the minimum concentration necessary to reduce sludgedisposal. In this concentration, rhamnolipid reduces sludge disposal of up to 52%, maintaining CODremoval of 81–97% and good sludge settling properties (SVI 120 mL/g) and could also reduce areaoccupied by secondary clarifier of 39–52%. However, biosurfactant application needs to be optimized,because its cost is even higher than the savings obtained with lower waste disposal
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