Table 1: Best available technology (BAT) requirements for bleached kraft mills. 100% substitution of chlorine dioxide for elemental chlorine Adequate chip thickness control Closed brownstock pulp screen room operation Use of dioxin and furan precursor-free defoamers Effective brownstock washing Elimination of hypochlorite Oxygen- and peroxide-enhanced extraction Use of strategies to minimize kappa factor and dioxin and furan precursors in brownstock pulp High shear mixing during bleaching Efficient biological wastewater treatment