European plants use pumps to reduce foamProblem: Two wastewater treatment plants in Brussels, Belgium, faced issues with sludge circulation in the decanting basins. Previously installed pumps were creating too much foam, leading to sludge particles floating near and on the surface. Because the sludge was not settling into the basins as expected, the extraction process was not effective and the pumps were using more energy than anticipated.Solution: Six Cornell 18NHFL self-priming pumps were installed to pump sludge from lower to higher tanks. They are driven by 90 kW electric motors and are controlled by variable-frequency drives that operate between 400
