ABSTRACT
The current study aims to investigate and compare the effects of waste plastic oil blended with n-butanol on the characteristics of diesel engines and exhaust gas emissions. Waste plastic oil produced by the pyrolysis process was blended with n-butanol at 5%, 10%, and 15% by volume. Experiments were conducted on a four-stroke, four-cylinder, water-cooled, direct injection diesel engine with a variation of five engine loads, while the engine's speed was fixed at 2500 rpm. The experimental results showed that the main hydrocarbons present in WPO were within the range of diesel fuel (C13–C18, approximately 74.39%), while its specific gravity and flash point were out of the limit prescribed by the diesel fuel specification. The addition of n-butanol to WPO was found to reduce the engine's thermal efficiency and increase HC and CO emissions, especially when the engine operated at low-load conditions. In order to find the suitable ratio of n-butanol blends when the engine operated at the tested engine load, the optimization process was carried out by considering the engine's load and ratio of the n-butanol blend as input factors and the engine's performance and emissions as output factors. It was found that the multi-objective function produced by the general regression neural network (GRNN) can be modeled as the multi-objective function with high predictive performances. The coefficient of determination (R2), mean absolute percentage error (MAPE), and root mean square error (RSME) of the optimization model proposed in the study were 0.999, 2.606%, and 0.663, respectively, when brake thermal efficiency was considered, while nitrogen oxide values were 0.998, 6.915%, and 0.600, respectively. As for the results of the optimization using NSGA-II, a single optimum value may not be attained as with the other methods, but the optimization's boundary was obtained, which was established by making a trade-off between brake thermal efficiency and nitrogen oxide emissions. According to the Pareto frontier, the engine load and ratio of the n-butanol blend that caused the trade-off between maximum brake thermal efficiency and minimum nitrogen oxides are within the approximate range of 37 N.m to 104 N.m and 9% to 14%, respectively.
ABSTRACT
This paper aims to critically review the production of alternative fuels through medical plastic waste. In the recent past, medical plastic waste has been disposed of and incinerated in the dumping yards, which is the main cause of the threat of infection and environmental hazards. Adopting proper waste management and the appropriate technology like the 5R's (refuse, reduce, reuse, repurpose, and recycle) may significantly improve the ecosystem. Moreover, the 5R's is a comprehensive approach that can be applied, either awareness of stakeholders or enforcement mandate and regulation by the government. The current review suggested the possible route for converting medical-plastic waste into drop-in fuel and value-added products to minimize the waste through suitable technology. In this, the pyrolysis technique plays an important role which is more ecologically friendly, effective and produces minimal pollutants. It has been observed that using COVID medical waste management (CMWM) technology, 70–80 % plastic pyrolysis oil (PPO), 10–15% bio-char, and gaseous fuel can be extracted. As per the ASTM, the extracted PPO is a potential feedstock for the CI engine fuel. This review work provides a suitable solution for CMWM and improves the quality of medical infrastructure for sanitation in a sustainable mode. © 2022 Elsevier Ltd
ABSTRACT
This paper aims to critically review the production of alternative fuels through medical plastic waste. In the recent past, medical plastic waste has been disposed of and incinerated in the dumping yards, which is the main cause of the threat of infection and environmental hazards.Adopting proper waste management and the appropriate technology like the 5R’s (refuse, reduce, reuse, repurpose, and recycle) may significantly improve the ecosystem. Moreover, the 5R’s is a comprehensive approach that can be applied, either awareness of stakeholders or enforcement mandate and regulation by the government. The current review suggested the possible route for converting medical-plastic waste into drop-in fuel and value-added products to minimize the waste through suitable technology. In this, the pyrolysis technique plays an important role which is more ecologically friendly, effective and produces minimal pollutants. It has been observed that using COVID medical waste management (CMWM) technology, 70–80 % plastic pyrolysis oil (PPO), 10–15% bio-char, and gaseous fuel can be extracted. As per the ASTM, the extracted PPO is a potential feedstock for the CI engine fuel. This review work provides a suitable solution for CMWM and improves the quality of medical infrastructure for sanitation in a sustainable mode.
ABSTRACT
Covid 19 is a highly infectious disease caused by SARS-CoV-2 that can spread from an infected person’s nose, mouth during coughing & sneezing. One of the warriors against Covid-19 is personal protection equipment (PPE), which is indispensable for everyone working closely with Covid-19 patients. The kits are made of different types of plastics and their disposal is going to be a serious menace, if not taken care of properly. The sustainable alternative to handle cast-off PPE kit is to convert them into pyrolysis oil using a thermochemical process. In the present paper, pyrolysis of PPE kit is done in a lab scale reactor to get the pyrolysis oil that has the potential to be used as alternate fuel in the neat or in blended form with conventional fuels. GC-MS of the obtained oil shows the presence of (C-7 to C-32) hydrocarbon fraction. FTIR analysis of the oil is also done for functional group composition. The results obtained also support the application of pyrolyisis oil as an alternate fuel. Physico-chemical characteristics of the pyrolysis oil sample are also comparable to the commercially available fuel with exception of viscosity as the fuel obtained has not been fractionated and has both light and heavy naphtha. © 2022 Informa UK Limited, trading as Taylor & Francis Group.