The report gives results of a laboratory-scale program investigating several fundamental issues involved in hazardous waste incineration. The key experiment for each study was the measurement of waste destruction behavior in a subscale turbulent spray flame. Atomization quality: the performance of subscale nozzles was directly measured in terms of droplet size by laser diffraction. Secondary atomization: test results showed that, when atomization quality was the limiting process, secondary atomization markedly improved both waste destruction efficiency and overall combustion efficiency, as measured by CO and total hydrocarbon emissions. Compound concentration: test results support the hypothesis that varying secondary atomization intensity with compound concentration in the feed explains most of the variation in laboratory-scale studies. A mechanism involving mixing limited equilibrium chemistry is proposed to explain the field data. Formation of products of incomplete combustion: the broad spectrum of volatile organic compounds from a simplified flame were measured. Test results show that most of the organic compounds present were from the fuel.