Catalyzes the NAD(+)-dependent oxidation of acetaldehyde to acetate. Is likely a component of the ethanol oxidation system that allows P.aeruginosa to grow on ethanol as the sole carbon and energy source. acetaldehyde + H2O + NAD(+) = acetate + 2 H(+) + NADH Alcohol metabolism; ethanol degradation; acetate from ethanol: step 2/2. Induced by growth on ethanol. Belongs to the aldehyde dehydrogenase family.