Pyrolysis Of Solid Waste

Pyrolysis is an alternate to incineration for volume reduction and partial disposal of solid waste. A large portion of MSW is composed of long-chain hydrocarbonaceous material such as cellulose, rubber, and plastic. This organic material represents a storehouse of organic building blocks that could be retained as organic carbon. Pyrolysis is a process that is less regressive than incineration and recovers much of the chemical energy.

Long-chain organic material disintegrates when exposed to a high-temperature thermal flux according to the following equation:

Polymeric material + Heat flux ®aA(gas)

The resulting gas includes CO2, CO, H2, CH4, and various C2 and C3 saturated and unsaturated hydrocarbons. The liquid contains a variety of chemical compounds, and the liquid ranges from a tar substance to a light water-soluble distillate. The solid is primarily a solid char.

The relative yield of each of these groups of pyroly-sis products depends on the chemical structure of the solid to be pyrolyzed, the temperature for decomposition, the heating rate, and the size and shape of the material.

If the products of pyrolysis react with oxygen, they react according to the following equations:

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