Abstract: A composite panel includes a sheet having layers. At least two of the layers are kraft paper. The layers re stacked on each other and adhered together with a resin. The sheet is corrugated with alternating peaks and valleys disposed sequentially along an axis of the sheet. Each peak has a plateau and each valley has a base. Each of the plateaus and the bases lies in a plane being substantially parallel to the axis of the one sheet.

Abstract: The prefabricated floor panel can include at least two planar panel members being spaced apart by and sandwiching a core, the core having at least one undulated inner support extending along a longitudinal axis and having summit portions, valley portions, and intermediate portions each extending between corresponding summit and valley portions, each of the summit, valley, and intermediate portions having opposed side edges, a span of the at least one inner support being defined between the opposed side edges, each side edge abutting against a corresponding one of the panel members, the undulated inner support having at least one sheet of wood material, fibres of said sheet of wood material being oriented normal to the panel members and parallel to the span, the at least one undulated inner support being laterally sandwiched between inner ribs with the summits being disposed adjacent a first one of the inner ribs and the valleys being disposed adjacent a second, opposite one of the inner ribs, the inner ribs b

Abstract: Methods for treating aqueous effluent, which include reducing sludge formation during the biological treatment of an aqueous effluent. The sludge formation is reduced by injecting an ozone containing gas into an aeration tank which contains the effluent. The affluent is in contact with microorganisms in the tank at least once during the method. The ozone containing gas contains at least 2.5 mg of ozone per liter of the gas.

Abstract: Methods for treating aqueous effluent, which include reducing sludge formation during the biological treatment of an aqueous effluent. The sludge formation is reduced by injecting an ozone containing gas into an aeration tank which contains the effluent. The affluent is in contact with microorganisms in the tank at least once during the method. The ozone containing gas contains at least 2.5 mg of ozone per liter of the gas.