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2. Simulation studies on the co-production of syngas and activated carbon from waste tyre gasification using different reactor configurations

Author

Lanrewaju I. Fajimi, Bilainu O. Oboirien, and Thomas A. Adams, II

Subjects
Tyre gasification, Activated carbon, Fluidized bed, Fixed bed, Rotary kiln, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Gasification is one of the most efficient thermo-chemical conversion processes for transforming waste tyres into syngas and high-valued solid carbon products such as activated carbon (AC). This study evaluated the co-production of syngas and AC in three reactor configurations: fluidized bed, fixed bed, and rotary kiln at the systems level. A single-stage steam gasification and char activation process was simulated using Aspen Plus V10 software. The effects of gasification parameters such as equivalence ratio (ER) and steam-to-fuel ratio (SFR) were investigated and compared. The best conditions for the co-production of syngas and AC in the reactors were evaluated and compared. Brunauer-Emmett-Teller (BET) computational analysis was used to predict the surface area of the AC. The fluidized bed gasifier has the potential to produce syngas with a low heating value (LHV) of 6.67 MJ/Nm3, cold gas efficiency (CGE) of 82.4%LHV, AC with BET surface area of 698.63 m2/g and a carbon conversion ratio (CCR) of 92.5%, the fixed bed gasifier has a syngas LHV of 6.25 MJ/Nm3, CGE of 85.9%LHV, AC with BET surface area of 432.51 m2/g and CCR of 97.3% and the rotary kiln gasifier has a syngas LHV of 5.96 MJ/Nm3, CGE of 74%LHV, AC with BET surface area of 661.73 m2/g and CCR of 93%.

Published
2021
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5. Bioremediation of Organic Pollutants in a Radioactive Wastewater

Author

Pulane E. Molokwane, Bilainu O. Oboirien, and Evans M.N. Chirwa

Subjects
Pollutant, Materials science, biology, Waste management, business.industry, Sewage, Biodegradation, biology.organism_classification, Pseudomonas putida, chemistry.chemical_compound, Bioremediation, chemistry, Wastewater, Environmental chemistry, Phenol, business, Effluent
Abstract

Bioremediation holds the promise as a cost effective treatment technology for a wide variety of hazardous pollutants. In this study, the biodegradation of organic compounds discharged together with radioactive wastes is investigated. Nuclear process wastewater was simulated by a mixture of phenol and strontium, which is a major radionuclide found in radioactive wastewater. Phenol was used in the study as a model compound due to its simplicity of molecular structure. Moreover, the biodegradation pathway of phenol is well known. Biodegradation studies were conducted using pure cultures of Pseudomonas aeruginosa and Pseudomonas putida. The rate of phenol degradation by both species was found to be higher in the test without strontium. This suggests some degree of inhibition in the degradation of phenol by strontium. There was no phenol degradation in the sterile controls. The results indicate the feasibility of the biodegradation of organic pollutants discharged in radioactive effluents by specialised microbial cultures.Copyright © 2007 by ASME

Published
2007
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