A study of thermophysical and ecological properties of highly loaded (50% mass.) coal-water slurry based on Kansk-Achinsk brown coal and distilled water (coal-water slurry fuel -CWSF) with exposure of used water to cavitation-treatment, microwave processing of coal powder, T-900 nanocarbon additions is presented. The study shows that under the conditions of this experiment the thermal physical properties of CWSF are most affected by the use of cavitation-activated water.