Waste Plastic Oil Research Articles

Influence of diethyl ether on the diesel engine diverse characteristics fuelled with waste plastic biodiesel

Scarcity of fuel was occurring in recent years throughout the world. Demand for higher fuel economy and lower exhaust emission of combustion ignition engine need to be achieved either by reducing energy loss or blending diesel with bio-fuel to reduce pollutant emission from transportation sector and meet satisfactory engine performance which is major technical challenge since the world is confronted with energy crisis. Demand for higher fuel economy and lower exhaust emission of combustion ignition engine need to be achieved by blending of the diesel with biofuel. The properties of waste plastic oil blends are determined experimentally as per ASTM standards. Base test results revealed 20% waste plastic oil (WPO 20) is shown improved engine diverse characteristics over the other blends of WPO. Later, the oxygenated fuel additive diethyl ether (DEE) is added at various levels like 5%, 10% and 15% to WPO 20 blend. Among the DEE addition to 20 WPO blend, it is found 10% DEE added 20 WPO blend shown 4.86 % increase in BTE over WPO20. Further, the engine exhausts like carbon monoxide, hydrocarbon, and smoke are drastically reduced by 52 %, 20.73% and 15.49 % respectively for the WPO 20 DEE 10 when compared to diesel.

Optimization of performance and emission characteristics of common rail direct injection diesel engine using response surface methodology

The performance and emission characteristics of a waste plastic oil biodiesel blend-fueled Common Rail Direct Diesel Injection (CRDI) engine with exhaust gas recirculation (EGR) were investigated in the current study using the Box-Behnken Design (BBD) matrix of the Response Surface Methodology (RSM). The optimisation of engine parameters like injection pressure (IP), load and EGR ratio were explored to enhance the working characteristics of CRDI diesel engine. The engine's input parameters were chosen to be IP, load and EGR ratio, and the responses were BSFC, BTE, NOx and HC. Multi-objective optimization has been used for the optimum engine responses using the desirability function. The optimum output engine responses were 21.25% BTE, 0.411 kJ/kW.hr BSFC, 20.31 ppm HC and 883.29 ppm NOx, respectively. At optimal engine running conditions yielded a composites desirability of 0.655. Optimized engine parameters received at an IP of 599.99 bar, the load of 55.04%, and the EGR ratio of 6.41. Confirmation experiments were carried out to validate optimization results by engine input parameters to optimal values. The output responses at optimum input parameters are evaluated experimentally and verified to be within the acceptable range of error (<5%). From this study, it has been concluded that the developed mathematical model can be used effectively to predict the engine characteristics.

Evaluation of Waste Plastic Pyrolysis Oil Performance with Diethyl Ether Additive on Insulated Piston Diesel Engine

Considering the amount of waste plastics has risen significantly, energy may be extracted from it. Not only is it possible to dispose of waste plastics by converting them to fuel, but it is also possible to extract energy from them. Our research is motivated by the prospect of using waste plastics as a source of energy through waste plastic pyrolysis oil (WPPO). The innovation of this research is that it will assess the efficiency of plastic pyrolysis oil derived from Low-Density Polyethylene (LDPE) on a Thermal Barrier Coated (TBC) piston engine. The incremental ratio of WPPO to pure diesel with the addition of diethyl ether (DEE) was determined and its output and exhaust emission standards were evaluated using a direct injection single cylinder low heat rejection diesel engine. The results for the WPPO blends were promising as with TBCW20DEE10 demonstrating a 5 to 15% increase in carbon monoxide under different load conditions. TBCW20DEE10 confirmed a greater reduction of hydrocarbons varying from 5 to 12 %. At half load condition, TBCW20DEE10 emits approximately 3.5 % less unit of smoke.

Improvement of performance and emission characteristic of waste plastic pyrolytic oil blended diesel fuel in variable compression diesel engine using graphene nano additive

A growing interest in extracting oil from waste plastics has converged with rising demand for petro-fuels and issues in disposing of waste plastics. The characteristics of pyrolytic oil produced from plastic wastes were compared to diesel and found to be sufficiently similar to be used as an alternative fuel. In this paper, an attempt has been taken to enhance the combustion properties of waste plastic oil blended diesel following dispersion of nanographene particles. The performance and emissions of a single-cylinder direct injection compression ignition engine with compression ratios ranging from 16:1 to 18:1 was evaluated using 50, 70, and 100 ppm by using 50, 70, and 100 ppm by mass of nanographene dispersed in 20% waste plastic oil blended diesel without any engine modification. By supercharging the engine with nanographene at various compression ratios, the performance of a 20% plastic oil blended diesel is compared to that of a neat diesel. The brake thermal efficiency of 20% plastic oil blended 100 ppm graphene dispersed diesel fuel increased by 1.16% at a compression ratio of 17:1 when compared to diesel. The CO, HC, NOx emissions also dropped significantly by adding 100 ppm nanographene to WPO as compared to the other combinations of fuels.

Study on the performance and emission characteristics of pyrolytic waste plastic oil operated CI engine using response surface methodology

Depletion of fossil fuels, strict pollution rules, and potential generation of waste plastics strive to focus another facet of value addition by conversion of plastic wastes into alternate fuel for a diesel engine. The current study is intended to optimize the combined influences of engine load, fuel blend, and compression ratio on the performance and emission of a normal diesel engine fueled with waste plastic oil diesel (WPO) blend by using response surface methodology (RSM). Optimum engine performance i.e.maximum brake thermal efficiency and minimum NOx emissions are established using the technique of response surface methodology concerning three different engine input parameters engine load, compression ratios, and fuel blend ratio. The compression ratio of 17, 10% of WPO-diesel blending at full load conditions are found to be optimum input parameters. And accordingly, the brake thermal efficiency of 28.8% and NOx emission of 162.45 ppm are obtained under multi-response optimization techniques. A sensitivity analysis has also been accomplished to clarify the significant contribution of different parameters and their orders of importance. The compression ratio has resulted as the most significant factor followed by load and % fuel blend.

Effective utilization and optimization of waste plastic oil with ethanol additive in diesel engine using full factorial design

Hydrocarbons, which are found in plastic, are an excellent energy source due to their high energy density. The disposal of plastic waste presents significant energy saving and recovery opportunities. The purpose of this study is to determine how much energy can be recovered from waste plastics as a possible alternative fuel source for cars. This research aims to assess the performance of waste plastic pyrolysis oil (WPO) generated by polyethylene pyrolysis. Ethanol is an appealing alternative fuel since it is made from renewable bio-resources and works as an oxygenated fuel in diesel engines, allowing for emission reductions. Three different percentages of WPO were combined with ethanol to create a tertiary fuel blend. This research examines the performance and emission requirements of a single-cylinder direct injection diesel engine. With diesel, D70W20E10′s specific fuel consumption reduces by about 7.5 %. Carbon monoxide emissions from D70W20E10 were about 6.5 % lower than diesel and 13.5 % lower than hydrocarbon at various loadings. The most optimum running condition was further examined using the Full Factorial Design method.

Pyrolysis of disposed plastic food containers and its potential in diesel engine by doping with nano particle at optimum injection timing

The excess consumption of plastics and improper waste management leads us to remove the plastic leftovers collected in landfills is basic from the ecological point of view. The conversion of waste into energy is an attempt that was made to assess the energy exemplified from waste plastic food containers could be recuperated as waste plastic oil (WPO) through pyrolysis. In order to maximise the potential of WPO as a fuel for diesel motors, Titanium dioxide (TiO2) nanoparticle was doped at three levels. This article focuses on the effect of nanoparticle doped WPO on diesel engine characteristics at three different fuel injection timings 25°BTDC (Before Top Dead Center), 23°BTDC, 21°BTDC. The test results displayed a greater improvement in brake specific fuel consumption and brake thermal efficiency for TiO2 nanoparticles blended test fuels when compared to other test blends by advancing the injection timing by two degrees. The significant reduction in pollutants such as carbon monoxide, hydrocarbons and smoke were recorded due to improved oxidation rate by TiO2 nanoparticle, however punished with little NOx. The study led to the decision that adding 150 ppm of TiO2 with WPO would be the decent substitute for diesel for the engines that are operated under 25°BTDC.

Effect of Addition of Palm Oil Biodiesel in Waste Plastic Oil on Diesel Engine Performance, Emission, and Lubricity.

This research was aimed to examine the diesel engine’s performance and emission of secondary fuels (SFs), comprising waste plastic oil (WPO) and palm oil biodiesel (POB), and to analyze their tribological properties. Their compositions were analyzed by gas chromatography–mass spectrometry (GC–MS). Five SFs (10–50% POB in WPO) were prepared by mechanical stirring. The results were compared to blank WPO (WPO100) and Malaysian commercial diesel (B10). WPO90 showed the maximum brake power (BP) and brake torque (BT) among the SFs, and their values were 0.52 and 0.59% higher compared to B10, respectively. The increase in POB ratio (20–50%) showed a negligible difference in BP and BT. WPO70 showed the lowest brake-specific fuel consumption among the SFs. The brake thermal efficiency (BTE) increased with POB composition. The maximum reductions in emission of hydrocarbon (HC, 37.21%) and carbon monoxide (CO, 27.10%) were achieved by WPO50 among the SFs. WPO90 showed the maximum reduction in CO2 emission (6.78%). Increasing the POB composition reduced the CO emissions and increased the CO2 emissions. All SFs showed a higher coefficient of friction (COF) than WPO100. WPO50 showed the minimal increase in COF of 2.45%. WPO90 showed the maximum reduction in wear scar diameter (WSD), by 10.34%, compared to B10. Among the secondary contaminated samples, SAE40-WPO90 showed the lowest COF, with 5.98% reduction compared to SAE40-WPO100. However, with increasing POB content in the secondary contaminated samples, the COF increased. The same trend was also observed in their WSD. Overall, WPO90 is the optimal SF with excellent potential for diesel engines.

Influence of WPO (Waste Plastic Oil) - gasoline mixtures for emission characteristics on working spark-ignition engine

The utilization of liquid products as transportation fuel derived from the thermal decomposition of different plastic waste mixtures was investigated. The production of pyrolysis oils was performed in a laboratory-scale batch reactor utilizing polystyrene (PS), polypropylene (PP), and high-density polyethylene (HDPE) waste blends. Two different mixtures (10% PS – 60% PP – 30% HDPE; 10% PS – 30% PP – 60% HDPE) were prepared, and the influence of reflux was also studied. The pyrolysis oils were blended to commercial gasoline in the 0-100% range. It was found that each blend could be successfully used as an alternative fuel in a traditional spark-ignition engine without any prior modifications or fuel additive. However, based on the engine tests, the presence of the reflux is vital as the composition of the pyrolysis oil is closer to the commercial gasoline. The emission measurements showed increasing NOx emissions compared to neat gasoline, but, on the other side, a decrease in CO was noticed. These changes were much smaller in cases when reflux was used during oil production. Based on the obtained results, the utilization of reflux-cooling is an effective method to enhance the gasoline range hydrocarbons in the plastic waste pyrolysis oils, and therefore blending these oils to commercial gasoline might be viable.

Performance and Emissions Characteristics of a Direct Injection C.I Engine Fuelled with Waste Plastic Oil and Diesel Concoction

The oils extracted from the waste plastic can be an admirable alternate for the compression ignition engines nevertheless they capitulate upper smoke emissions along with deprived performance when compared with diesel. The extraction of waste plastic oil (WPO) is attained through pyrolysis. The impact of accumulating a constituent hexanol (H), a biologically available biofuel is assessed. Three ternary mixtures, DE50-WPO40-H10, DE50-WPO30-H20 and DE50-WPO20-H30 has been deliberately primed for utilizing mutually a cast-off element (WPO maximum of 40 percent) along with a non-conventional part (hexanol maximum of 30 percent). The performance characteristics and emission factors of C.I engine fuelled with the above mix were assessed. The output specifies that hexanol inclusion makes significant reduction in smoke emission in addition to privileged HC emission in contrast to diesel. Inclusion of 10 percent hexanol in volume with WPO and diesel mixture retards the NOx emission considerably whilst match up to WPO as well as diesel individually. In spite of this, NOx emission is superior than the subsequent WPO with increased degree of hexanol converges. Brake thermal efficiency of the engine increases by way of escalating the hexanol portion in the blend while comparing with WPO. The fuel spending of concoction has been established to be reduced while compared to WPO. DE50-WPO40-H10 concoction showed a reduced amount of NOx as well as smoke emission.

Synthesis and Performance Evaluation of Fuel from Waste Plastics

Plastics are an integral part of our lives and the production of plastics has drastically increased over the years, because of its vast range of applications and usage. Due to this the accumulation of waste plastics has also increased in time. The waste plastic generated in India is 15000 tons per day (as per survey). The breakdown of plastics requires around 500 years in the earth and these waste plastics affect the humans, animals, birds, earth and environment. The demand for conventional fuel has also increased lately and the quantity of this fuel reserve has decreased simultaneously. The extensive usage of the conventional fuels has paved the path for alternative ways for energy sources and alternate fuels. The extraction of waste plastic oil is obtained by the process of pyrolysis which is nothing but the thermochemical decomposition of organic matter without oxygen. The extracted plastic pyrolysis oil is then blended with diesel which helps in reducing the consumption of diesel fuel. Different blend ratios are prepared consisting of the extracted waste plastic pyrolysis oil and diesel fuel. These fuels are tested in the engine to understand the variation in the engine performance and emissions with the help of a gas analyser. By this way, the suitable blend ratio is selected for further works. This blend of fuel can exhibit high thermal efficiency and increases machine efficiency. The fuel does not emit sulphur dioxide (SO2) and the residue obtained is only 5 percent which is said to be carbon.

Overview of Feedstocks for Sustainable Biodiesel Production and Implementation of the Biodiesel Program in Pakistan.

The energy demand of the world is skyrocketing due to the exponential economic growth and population expansion. To meet the energy requirement, the use of fossil fuels is not a good decision, causing environmental pollution such as CO2 emissions. Therefore, the use of renewable energy sources like biofuels can meet the energy crisis especially for countries facing oil shortages such as Pakistan. This review describes the comparative study of biodiesel synthesis for various edible oils, non-edible oils, and wastes such as waste plastic oil, biomass pyrolysis oil, and tyre pyrolysis oil in terms of their oil content and extraction, cetane number, and energy content. The present study also described the importance of biodiesel synthesis via catalytic transesterification and its implementation in Pakistan. Pakistan is importing an extensive quantity of cooking oil that is used in the food processing industries, and as a result, a huge quantity of waste cooking oil (WCO) is generated. The potential waste oils for biodiesel synthesis are chicken fat, dairy scum, WCO, and tallow oil that can be used as potential substrates of biodiesel. The implementation of a biodiesel program as a replacement of conventional diesel will help to minimize the oil imports and uplift the country’s economy. Biodiesel production via homogeneous and heterogeneous catalyzed transesterification is more feasible among all transesterification processes due to a lesser energy requirement and low cost. Therefore, biodiesel synthesis and implementation could minimize the imports of diesel by significantly contributing to the overall Gross Domestic Product (GDP). Although, waste oil can meet the energy needs, more available cultivation land should be used for substrate cultivation. In addition, research is still needed to explore innovative solvents and catalysts so that overall biodiesel production cost can be minimized. This would result in successful biodiesel implementation in Pakistan.

Fuel property improvement and exhaust emission reduction, including noise emissions, using an oxygenated additive to waste plastic oil in a diesel engine

AbstractThis work reports on an extensive investigation of the physicochemical properties, engine performance, exhaust emissions, and fundamental energy and exergy parameters of waste‐plastic oils blended with an additive, diethyl ether and diesel. A four‐stroke single‐cylinder diesel engine was used for the engine experiments. The seven fuels in this study include a neat diesel, a neat waste plastic oil, two binary blends of diesel‐waste plastic oil, and three ternary blends of diesel with waste plastic oil and diethyl ether. The justification for selecting diethyl ether was to augment fuel properties in the blend and to further reduce emissions. The reasons for choosing waste plastic are not only to harness energy from waste plastic but also to offer an effective solution to the plastic waste management issue. The choice of diesel was to use it as a reference fuel for comparison with other fuels. Fuel properties were observed to be similar, and in some cases better, with the blends. Notable reductions in emissions with identical engine performance and energy and exergy parameters were observed with the five oxygenated blends (plastic oil blends) than with a reference diesel fuel. © 2021 Society of Chemical Industry and John Wiley &amp; Sons, Ltd

Critical insights into the effects of plastic pyrolysis oil on emission and performance characteristics of CI engine.

Pyrolysis is an encouraging solution considering the facts of energy demand and waste plastic management as it produces liquid fuel for compression ignition engine application. This study provides critical insights into the effects of waste plastic oil on the emission and performance characteristics of compression ignition engines. Though most of the studies have shown a negative influence, promising outcomes have been noticed in a few specific cases. A maximum of 71%, 80%, 76%, 71%, 21%, and 13% decrease in nitrogen oxide emission, carbon monoxide emission, unburnt hydrocarbon emission, smoke emission, exhaust gas temperature, and brake-specific fuel consumption, respectively, have been noticed with waste plastic oil or its blends at certain operating conditions. Nevertheless, the presence of long carbon chains, higher aromatic content, and non-homogeneous air-fuel mixture owing to the wide product distribution in plastic oil are the few reasons which affected the emission and performance characteristics of the engines. More rigorous investigations are needed to improve the quality of the fuel and to establish correlations between the fuel properties and pyrolysis parameters. In addition, the effects of incorporating exhaust gas recirculation, emulsification process, and use of additives with waste plastic oil need to be explored more for reducing the emissions with satisfactory engine performance, and in this regard, the use of bio-additives with waste plastic oil can provide a new direction to this research field. Further, studies on the economic feasibility and the impact of waste plastic oil on engine materials are also required.

Effect of EGR on Performances and Emissions of DI Diesel Engine Fueled with Waste Plastic Oil: CDF Approach

Recently, there is an increasing interest in the pyrolysis of waste plastic into usable fuel as a friendly environment method for waste plastic disposal. The existing literature from various studies stated that the major problem related to the use of WPO in diesel engines is the high NOx emissions level. This paper aims to remedy this problem by suggesting the best EGR percentage with the advanced optimum injection timing. Primary, 5 EGR percentage fractions are considered: 0%, 5%, 15%, 20% and 25% percent. The results showed that 25% is the best percentage regarding emissions. However, a significant reduction in mean in-cylinder pressure, temperature, and heat release rate was depicted with the EGR fraction increase. Injection timing is advanced to recoup the decrease in performance. The results showed that 25% of EGR and advanced injection timing by 5 degrees would be better for performances and emissions of DI diesel engine while running with waste plastic oil as an alternative fuel.

Thermal balancing and exergetic performance evaluation of a compression ignition engine fuelled with waste plastic pyrolytic oil and different fuel additives

This study aims at evaluating the heat energy and exergy values of waste plastic oil (WPO) blended diesel mixed with different fractions of fuel additives (ethanol as oxygenated fuel additive and nano graphene as nano additive) with a view to establish the thermal balancing of a diesel engine analytically taking experimental data and comparing with neat diesel oil. The research engine used was a four stroke, constant speed, stationary, direct injected, single cylinder, water-cooled compression ignition engine tested at different loading conditions. The thermal balance was prepared in respect of work output, heat loss in cooling, heat loss in exhaust gas, heat loss in lubrication and additional unaccounted heat losses in order to measure the efficiency of the engine in agreement with thermodynamics energy principles. Three test fuels with same plastic oil and different fuel additives concentration (comprising of 80% Diesel+20%WPO, 60% Diesel + 20%WPO+20% Ethanol and 80%Diesel +20% WPO+100 ppm nano graphene) are prepared for the engine test. The addition of ethanol in WPO blended diesel fuel mixture contributes marginal increase in brake thermal efficiency, decrease in brake specific fuel consumption, higher exhaust gas temperature and lower exergetic efficiency as compared to that of diesel. Nano graphene added to WPO blended diesel enhanced its energy along with exergy efficiency values as compared to other fuel mixtures under higher operating load condition. Fuel exergy for this fuel was increased by 18.57% in comparison to diesel at highest load. However, Exergy destruction and exhaust exergy were decreased by 34.97% and 14.03% respectively in comparison to diesel at highest load. Moreover, exergetic efficiency was enhanced by 18.9% than diesel at maximum load condition.

Characterization and Impact of Waste Plastic Oil in a Variable Compression Ratio Diesel Engine

The characterization of pyrolysis oil obtained from mixed waste plastics and its utilization in a compression ignition engine were investigated. The chemical compositions and physicochemical properties of distilled waste plastic oil (WPO) and crude waste plastic oil (CWPO) were analyzed. The experiment was conducted with a variable compression ratio diesel engine at various loads and compression ratios to evaluate combustion characteristics, exhaust emissions, and engine performance. The experimental results show that CWPO contains the highest percentage of carbon atoms in the C4–C11 group, while WPO contains the highest percentage of carbon atoms in the C12–C20 group, similar to the main compositions of diesel fuel. According to the preliminary study in chemical compositions and physicochemical properties, WPO and diesel fuel were selected for the engine test at different compression ratios of 16, 17, and 18 and different engine operating loads of 25%, 50%, and 75% of maximum engine torque at an engine speed of 1500 rpm. It was found that increasing the engine operating load and the compression ratio tends to increase the brake thermal efficiency. Increasing the compression ratio results in a significantly shorter delay time in a combustion state. A lower cetane index and a higher percentage of long chain carbon compounds (C12–C20) could be the main factors affecting higher NOx, CO, and HC emissions with the combustion characteristics of WPO, compared to diesel fuel. The disadvantage of emissions by the use of WPO can be alleviated when the engine is running at maximum load and a high compression ratio.

Production of fuel-blends from waste tyre and plastic by catalytic and integrated pyrolysis for use in compression ignition (CI) engines

The increase in energy demand and depletion of oil reserves has prompted researchers to seek alternative fuels for compression ignition engines. In this study, the characteristics of the fuels obtained from waste tyres/plastics were determined and compared with those of diesel fuel. The waste plastic oil was obtained from polyethylene terephthalate, polypropylene, high-density polyethylene, polystyrene, low-density polyethylene, and poly (vinyl chloride), thereafter, they were each blended with distilled waste tyre oil from used Dunlop tyres, in different ratios, for use as substitute fuels in a CI engine. The engine (Kirloskar, TAF 1 model) performance was studied based on its combustion, brake thermal efficiency (BTE) and emission characteristics when run on the fuels obtained from the waste-tyres/plastics. The test results showed the engine gave a higher performance in terms of BTE for E (33.9%) and F (36.9%) whereas, others gave lower performance (A- (31.9%), B (30%), C (29.7%), D (32.4%) with respect to diesel fuel. The pyrolyzed Polystyrene/tyre blends gave the highest BTE of 36.9%, with low emission. Although lower emissions were recorded for the blended fuels relative to the diesel fuel, the resulting peak emissions for the blends are in the following increasing order: unburnt HC (B (30.1) < D (30.1) < F (30.2) < A(30.4) < E (30.7) < C(31 ppm), NOx (F (1001) < B (1100) < D (1107) < C (1107) < E (1108) < 1150 ppm) and CO (F (0.003) < E (0.004) < B (0.005) < A(0.006) < C(0.007) < D (0.008) ppm.

Role of non metallic Nano additive in the behavior of a diesel engine fueled with blends of Waste plastic oil

This study analyze about the efficiency improvement and emission reduction of a 4 stroke mono cylinder diesel engine fueled by 20 % by volume mixture of Waste Plastic Oil (WPO) blended with 80 % diesel and different proportion of non metallic nano additive. WPO was extracted through the pyrolysis process using plastic wastes collected from near by areas. Nano additives made from rice husk was blended @ 25ppm, 50ppm, 75ppm and 100ppm. The fuel mixture was tested for its stability and later used in diesel engine for performance, emission and combustion characters. Result indicate that for W20 mixture without additives revealed 3.5 % drop in brake thermal efficiency (BTE) and Brake specific fuel consumption (BSFC) increased by 5.7 % at a full load condition when equated with diesel. With the blending of Non metallic Nano additives (NA), the BTE increased by 2.6 % and fuel consumption reduces by 3.1% for the W20NA75 blend when compared to other blends. Emissions parameters like hydrocarbon (HC), carbonmonoxide (CO) and smoke opacity reduced by 15.3%, 7%, and 20.4% respectively with rise in oxides of nitrogen (NOx) emission by 14.1% when equated to diesel at maximum load condition. It can be concluded that 75ppm rice husk nanoparticles added with W20 blend helped to rise the efficiency characters and reduces engine out pollutants of a CI engine.

Effect of EGR on a diesel engine fueled with waste plastic oil blend

With the increasing global demand for fuels, there is a need to reduce vehicular emissions which are one of the major causes of air pollution around the globe. NOx emissions leads to health issues, acid rain, global warming, etc. Diesel engines are the major sources for NOx emissions. Hence there is a need to reduce the emissions from the engines by means of alternate fuels and emission control technologies. This investigation deals with the effect of exhaust gas recirculation (EGR) on single cylinder, direct injection diesel engine using plastic oil and diesel blend (10% plastic oil + 90% diesel) at EGR rates of 5%, 10% and 15%. Plastic oil blends were able to operate in diesel engines without any modifications and based on the results, EGR decreases the NOx emissions with a minimum increase in specific fuel consumption. The engine with the EGR rate of 15% and at the full load condition, the emission level of NOx has been decreased from 1327 to 661 ppm. Hence it was concluded that the low emission level of NOx can be obtained using EGR for the plastic oil blend. The results showed that DPB+EGR15 blend had the least NOx emission.