Microwave catalytic co-pyrolysis of chlorella vulgaris and oily sludge: Characteristics and bio-oil analysis

• Published in: Bioresource technology 2022-09, Vol.360, p.127550-127550, Article 127550
• Main Authors: Chen, Chunxiang, Ling, Hongjian, Qiu, Song, Huang, Xiaodong, Fan, Dianzhao, Zhao, Jian
• Format: Article
• Language: English
• Subjects: Additives; Bio-oil; biofuels; carbon; Chlorella vulgaris; Co-pyrolysis; furnaces; nickel oxide; Oily sludge; pyrolysis; sludge; synergism
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2022.127550

[Display omitted] •Co-pyrolysis of CV and OS with NiO, AC and N1A1 were investigated.•Co-pyrolysis increased hydrocarbons and decreased N, O compounds.•The addition of 10% AC showed the best characteristics on co-pyrolysis.•Synergistic interaction of NiO and AC was optimal at 10% N1A1 addition.•10% N1A1 effectively increased aliphatic hydrocarbons and decreased N, O compounds. Co-pyrolysis of Chlorella vulgaris (CV) and Oily sludge (OS) under different mixing ratios were investigated by microwave furnace. NiO, activated carbon (AC) and their 1:1 compound (N1A1) with different additions (5%, 10%, 15% and 20%) were selected as microwave additives to study the effects on optimum mixing ratio of co-pyrolysis. The results indicated that mixing ratio of CV/OS = 1:1 (C1O1) was optimum for co-pyrolysis. Besides, 10% AC was optimal on improving pyrolysis characteristics of the C1O1 group. The most significant synergistic interaction of NiO and AC occurred in the 10% N1A1 group. Moreover, hydrocarbons in bio-oil of the C1O1 group increased by 31.84% compared with theoretical values, while nitrogenous, oxygenated compounds decreased by 74.18% and 19.01%. Addition of 10% N1A1 in the C1O1 group increased aliphatic hydrocarbons by 22.44%, and decreased nitrogenous, oxygenated compounds by 41.79% and 36.58%. Overall, 10% N1A1 was conducive for the C1O1 group to obtain high-quality bio-oil.