Abstract
AbstractGalloping rate of environmental pollution and primary fuel growth has engendered engineers to devise alternative renewable energy-based processes for sustainable fuel supply of power plants. Anaerobic digestion (AD) process can be regarded as one of the main solutions to surmount this problem. With this regard, AD method is considered in this study for power generation and its main advantages in terms of CO2 emission reduction and primary fuel savings are discussed versus two conventional waste management methods of incineration and landfill as well as different fossil fuel-based power plants. The comparison is carried out at two different scenarios of constant input waste and constant input electrical power under minimum and maximum capacities. It is found that the highest CO2 emission reduction is calculated 14,739 tons per year when AD is used instead of gas oil in the diesel power plants (DPPs) under maximum power generation of 39.51 million kWh per year, and hence AD method is highly commendable for this scenario. Also, although using AD method instead of fossil fuel in the combined power plants (CPPs) increased CO2 emission (which is not appealing), it saved equivalent primary fuel around 6.5 million m3 under minimum power capacity of 29.63 million kWh per year and 8.6 million m3 under maximum power capacity of 39.51 million kWh per year. Finally, fuel savings cost and payback time for different scenarios are estimated and the main advantages of using AD method instead of the conventional primary fuels in the screened power plants are pinpointed from economic vantage point. Also, under maximum power capacity of 39.51 million kWh/yr employing AD method instead of gas oil in the DPPs can save 8.22 million dollars in October with payback time of 1 year and 7.69 million dollars in November with payback time of 1.1 year.KeywordsAnaerobic digestion (AD)Municipal waste treatmentFuel savingsCO2 emission reductionCost savings
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