I. Domestic waste collection volume
From the consideration of the economic feasibility of the construction of waste-to-energy projects, the scale of domestic waste treatment for a single project must reach at least 500 tons per day. Therefore, the amount of domestic waste collected and centrally processed in the area where the waste-to-energy project is currently proposed must be more than 500 tons per day, at least when the project starts operation (the construction period of the project is usually 1.5 to 2 years). If accurate data on the amount of garbage collected is not available, the following two conditions must be met.
1. Local population
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Currently, each person in China's cities and towns produces about 1 kilogram of garbage per day. Considering that the actual garbage that can be collected is 80% of the actual garbage produced, the resident urban population in the area of the proposed waste-to-energy project must be more than 600,000 (note that the rural population is not included here, which generally lives in a more dispersed manner, making it inconvenient for garbage to be collected, and at the same time, due to the different habits of living in rural areas, the calorific value of the garbage generally fails to meet the incineration requirements).
2. Garbage collection and transportation system
If the local population conditions are met, the amount of garbage generated will be sufficient, but if there is no garbage collection and transportation system, the amount of garbage will have no way to be centrally collected and processed. Therefore, the area of the proposed waste-to-energy project must have a better garbage collection and transportation system, including garbage transferring battle, garbage transportation trucks, etc., and the garbage collection and transportation system must cover all the urban areas.
Second, the calorific value of domestic waste
Domestic waste without auxiliary fuels can be incinerated for power generation requires that the calorific value of the waste generally need to reach 4187kJ/kg (1000kcal/kg) or more. This requires that the gasification rate of urban residents in the area of the proposed waste-to-energy
project must reach more than 80% (not more than 20% of the residents burning coal). If there are too many domestic coal-burning residents, the proportion of ash in the domestic waste will be very large, which will lead to insufficient calorific value of the waste.
Third, the local financial ability to pay
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The garbage power generation project investment is large, the operating costs are high, relying on electricity revenue alone can not meet the daily operation of the garbage power plant, the local government must pay a certain amount of subsidies for garbage disposal. Calculated on the basis of a project with a waste treatment scale of 500 tons per day, the subsidy fee for each ton of domestic waste cannot be less than $55. Therefore, the region where the waste-to-energy project is proposed will need to pay about $10 million per year in waste treatment subsidy fees.