In-situ and ex-situ co-pyrolysis studies of waste biomass with spent motor oil: Elucidating the role of physical inhibition and mixing ratio to enhance fuel quality. (August 2022)

• Record Type: Journal Article
• Authors: Siddiqi, Hammad; Mishra, Asmita; Maiti, Payal; Dipamitra Behera, Ipsita; Meikap, B.C.
• Is Part Of: Bioresource technology. Volume 358(2022)
• Publication Date: 2022-08
• Subjects: Waste-to-Energy -- Co-pyrolysis -- Hazardous Waste Management -- Bio-oil -- Reaction Mechanism; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127364
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Sustainable hazardous waste management and simultaneous bio-oil up-gradation. HHV increased to 41.40 MJ kg −1 and 62.70% water content reduction after co-pyrolysis. Iso-paraffin index of 0.285 for the in-situ mode of operation. Oxygenated groups decreased by 56% indicating improved bio-oil stability. In-situ mode produced a balanced composition of aromatic and aliphatic hydrocarbon. Abstract: Simultaneous renewable energy generation is an imperative part of sustainable hazardous waste management. Therefore, the present work explicates the co-pyrolysis of rice stubble (RS) waste biomass and spent motor oil (SMO) to upgrade the obtained bio-oil. Moreover, two different modes, namely, in-situ and ex-situ, were implemented to analyze the effect of physical inhibition. Monothetic analysis approach was followed to determine optimum process conditions. A substantial increment of ∼ 85% was observed in bio-oil yield for RS: SMO (1:1) in-situ operation whilst the only RS biomass pyrolysis. Moreover, the HHV increased by ∼ 2.15 times after co-pyrolysis with a considerable reduction (62.70%) in water content. Consequently, the paraffin content increased to 79.14 vol% with an iso -paraffin index of 0.285. Subsequently, a possible reaction mechanism is also proposed to evaluate results comprehensively. Altogether, the co-pyrolysis of these feedstocks resulted in improved aliphatic content and reduced oxygenates, encouraging its adequacy as an alternate fuel.