Ultrafiltration membranes for water treatment. The phase-out of coal as the fuel in power generation will cause an increase in the use of biomass in co-generation power plants. The flue gas from the combustion will contain some heavy metals. The EU industrial emissions directive requires power plants to invest in technologies that increase the efficiency of the plants with particular emphasis on flue gas condensation, as it enhances efficiency and reduces the emission of pollutants such as soot and heavy metals.