chap 2-2 水污染詞彙表

Glossary 詞彙表
Chapter 20

cultural eutrophication 文化優養化

Near urban or agricultural areas, human activities can greatly accelerate the input of plant nutrients to a lake—a process called cultural eutrophication involving mostly nitrate- and phosphate-containing effluents from various sources.


the name given to the natural nutrient enrichment of a shallow lake, estuary, or slowmoving stream, mostly from runoff of plant nutrients such as nitrates and phosphates from surrounding land.

nonpoint sources 非點源

broad, and diffuse areas, rather than points, from which pollutants enter bodies of surface water or air.

point sources點源

discharge pollutants at specific locations through drain pipes, ditches, or sewer lines into bodies of surface water.

primary sewage treatment初級污水處理

Raw sewage reaching a treatment plant typically undergoes one or two levels of wastewater treatment. The first is primary sewage treatment—a physical process that uses screens and a grit tank to remove large floating objects and to allow solids such as sand and rock to settle out.

secondary sewage treatment二級污水處理

Raw sewage reaching a treatment plant typically undergoes one or two levels of wastewater treatment. The second level is secondary sewage treatment—a biological process in which aerobic bacteria remove as much as 90% of dissolved and biodegradable, oxygen-demanding organic wastes.

septic tank化糞池

In rural and suburban areas with suitable soils, sewage from each house usually is discharged into a septic tank with a large drainage field.

water pollution 水污染

any chemical, biological, or physical change in water quality that harms living organisms or makes water unsuitable for desired uses.
Last modified: Sunday, 1 November 2009, 9:16 PM