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Effect of composite additives on microwave-assisted pyrolysis of microalgae

ABSTRACT 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 (R v) and weight loss rate for the second peak (R p2) were maximum, while the final time detected as weight stabilization (t f) and the time corresponding to second peak (t p2) 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 (M t) and the weight loss rate for the first peak (R p1) were maximum and the time corresponding to first peak (t p1) was minimum. The minimum R v and M t occurred at 7.5% CaO group.