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Citation: L. Piirtola et al., Effect of mineral materials and cations on activated and alum sludge settling, WATER RES, 34(1), 2000, pp. 191-195

Authors: Piirtola, L Hultman, B Andersson, C Lundeberg, Y

Citation: L. Piirtola et al., Activated sludge ballasting in batch tests, WATER RES, 33(8), 1999, pp. 1799-1804

Authors: Piirtola, L Hultman, B Lowen, M

Citation: L. Piirtola et al., Activated sludge ballasting in pilot plant operation, WATER RES, 33(13), 1999, pp. 3026-3032