Co-fire

Co-fire: Burning of two fuels in the same combustion unit; e.g., coal and natural gas, or oil and coal.
Coagulation: Clumping of particles in wastewater to settle out impurities, often induced by chemicals such as lime, alum, and iron salts.

A dark brown, mobile liquid containing much of the energy content of the original biomass, with a heating value about half that of conventional fuel oil. Can be burned directly, either alone or co-fired with other fuels, ...

See also: Landfill, Well, Organic, Efficiency, Compounds