A device used to separate solids and liquids in sludge or slurry through pressure.

Stationary sources of pollution, such as factories or power plants.

A process of separating substances by causing some to float in a liquid medium.

A mass of bubbles formed in or on a liquid, often used in firefighting or pollution control.

Water that has low concentrations of dissolved salts, suitable for drinking and irrigation.

The composition and chemical characteristics of a fuel, designed to meet specific performance or environmental standards.

Emissions of gases or vapors from pressurized equipment due to leaks or other unintended releases.