General

General

General nature or nature terms.

Industry: Natural environment

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General

acid aerosol

Natural environment; General

Acidic liquid or solid particles small enough to become airborne. High concentrations can irritate the lungs and have been associated with respiratory diseases like asthma.

A complex chemical and atmospheric phenomenon that occurs when emissions of sulfur and nitrogen compounds and other substances are transformed by chemical processes in the atmosphere, often far from ...

acid mine drainage

Natural environment; General

Drainage of water from areas that have been mined for coal or other mineral ores. The water has a low pH because of its contact with sulfur-bearing material and is harmful to aquatic organisms.

acid neutralizing capacity

Natural environment; General

Measure of ability of a base (e.g. water or soil) to resist changes in pH.

acidic

Natural environment; General

The condition of water or soil that contains a sufficient amount of acid substances to lower the pH below 7.0.

activated carbon

Natural environment; General

A highly adsorbent form of carbon used to remove odors and toxic substances from liquid or gaseous emissions. In waste treatment, it is used to remove dissolved organic matter from waste drinking ...

activated sludge

Natural environment; General

Product that results when primary effluent is mixed with bacteria-laden sludge and then agitated and aerated to promote biological treatment, speeding the breakdown of organic matter in raw sewage ...