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The effect of composite additives on the pyrolysis characteristics of microalgae ( Dunaliella salina ) was studied by microwave-assisted pyrolysis system. The composite additive was blended by SiC and CaO. The three cases, i.e. different kinds of additives (single additive and composite additive), different addition amounts (5%, 10%, 15%, 20%, and 25%) of composite additives, and different blending ratios (SiC/CaO = 0:10, 3:7, 5:5, and 7:3) were investigated. The results show that when the composite additive was 15% and the blending ratio of SiC/CaO = 5:5, the average weight loss rate ( Rv ) and weight loss rate for the second peak ( Rp2 ) were maximum, while the final time detected as weight stabilization ( tf ) and the time corresponding to second peak ( tp2 ) were minimum. Besides, SiC and CaO had a synergistic effect in this experimental condition. When the additive was 7.5% SiC, the total weight loss ( Mt ) and the weight loss rate for the first peak ( Rp1 ) were maximum and the time corresponding to first peak ( tp1 ) was minimum. The minimum  Rv  and  Mt  occurred at 7.5% CaO group.

Effect of composite additives on microwave-assisted pyrolysis of microalgae