| Subject | English | Spanish |
| environ. | biological effluent treatment | tratamiento biológico de los efluentes |
| environ. | biological treatment Process that uses microorganisms to decompose organic wastes either into water, carbon dioxide, and simple inorganic substances, or into simpler organic substances, such as aldehydes and acids. The purpose of a biological treatment system is to control the environment for microorganisms so that their growth and activity are enhanced, and provide a means for maintaining high concentration of the microorganisms in contact with the wastes | tratamiento biológico |
| environ. | biological treatment | depuración biológica |
| oil | biological treatment | tratamiento biológico |
| water.res. | biological treatment | tratamiento secundario de aguas residuales |
| environ. | biological treatment of waste | tratamiento biológico de los residuos |
| environ. | biological treatment plant | estación de depuración biológica |
| environ. | biological waste treatment | tratamiento de residuos biologicos |
| environ. | biological waste treatment A generic term applied to processes that use microorganisms to decompose organic wastes either into water, carbon dioxide, and simple inorganic substances, such as aldehydes and acids. The purpose of biological waste treatment is to control either the environment for microorganisms so that their growth and activity are enhanced, and to provide a means for maintaining high concentrations of the microorganisms in contact with the wastes | tratamiento de residuos biologicos |
| environ. | biological wastewater treatment | tratamiento biológico de aguas residuales |
| environ. | biological wastewater treatment Types of wastewater treatment in which biochemical or bacterial action is intensified to oxidize and stabilize the unstable organic matter present. Examples of this type of treatment use intermittent sand filters, trickling filters, and activated sludge processes and sludge digestion | tratamiento biológico de aguas residuales |
| environ. | fully biological sewage treatment plant | estación depuradora totalmente biológica |
| environ. | secondary biological treatment | tratamiento intermedio |
| environ. | secondary biological treatment | tratamiento secundario |
| environ. | secondary biological treatment | tratamiento biológico secundario |
| environ. | wastes stabilized by biological treatment | Residuos estabilizados/solidificados mediante tratamiento biológico |
