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acid rain (or acid precipitation): rain with a pH of less than 5.6; results from atmospheric moisture mixing with sulphur and nitrogen oxides emitted from burning fossil fuels or from volcanic activity; may cause damage to buildings, monuments, car finishes, crops, forests, wildlife habitats, and aquatic life.
(lluvia ácida)
activated sludge: sludge floc produced in raw or settled wastewater by the growth of zoogleal bacteria and other organisms in the presence of dissolved oxygen and accumulated in sufficient concentration by returning floc previously formed.
(Lodos activos)
aerobic: living or occurring in the presence of oxygen.
(aeróbico)
aerobic process: any process that take place with the presence of air or oxygen.
(proceso aeróbico)
aerosol: minute liquid droplets or solids of particle size up to 100 fm suspended in a gaseous flow or the atmosphere. Due to their small size, they can be readily dispersed. There are two types: condensation aerosols, formed when moisture-laden gases are cooled, and dispersion aerosols, formed from the break up of solids or atomization of liquids.
(aerosol)
ammoniacal nitrogen: a measure of the nitrogen compounds present in solution as ammonia or ammonium ion, generally derived from biological activity. Concentrations above few mg/l may indicate pollution.
(nitrógeno amoniacal)
anaerobic bacteria: any bacteria that can survive in the complete or partial absence of air.
(bacteria anaeróbica)
anaerobic digestion: controlled biological decomposition of organic material in the absence of oxygen to produce biogas and partially stabilized organic material.
(digestión anaeróbica)
atmospheric transport: the movement of air pollutants from one region to another by wind; may be hundreds of miles.
(transporte atmosférico)
autotroph: an organism that can make its own food (usually using sunlight).
(autótrofa)
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