One of the mysteries of the English language finally explained.
The amount of dissolved oxygen that must be present in water in order for microorganisms to decompose the organic matter in the water, used as a measure of the degree of pollution.Also called biological oxygen demand
- ‘This could be caused either by natural factors, such as tidal influences and nocturnal algae respiration, or by high biochemical oxygen demand as a result of eutrophication or even high organic input by industries.’
- ‘Gives easy to understand and clear instructions for testing dissolved oxygen, fecal coliforms, pH, biochemical oxygen demand, temperature, total phosphate, nitrates, turbidity, and total solids.’
- ‘Sand bioreactor effluent is typically very clear with low biochemical oxygen demand and ammonia levels.’
- ‘Another body, the U.S. Council on Environmental Quality established five measures for judging water quality: biochemical oxygen demand, nitrogen, phosphorus, dissolved oxygen, and fecal coliform bacteria.’
- ‘It said: ‘While work is carried out a temporary variation… is sought to relax the limits for biochemical oxygen demand, ammonia and solids on the treated sewage effluent.’’
- ‘Originally, the biochemical oxygen demand and total suspended solids received most of the attention.’
- ‘Treatment plants are expected to meet lower discharge requirements for carbonaceous biochemical oxygen demand, total suspended solids, and nutrients.’
- ‘Maintaining the biochemical oxygen demand, nitrogen and organic matter content of wastewater outside the limits that are favourable for mosquito breeding is very helpful.’
- ‘The results are expressed in terms of oxygen so that they can be compared directly to the results of biochemical oxygen demand testing.’
- ‘The company are accused of nine offences over an 18-month period between October 2002 and April 2004 on the basis that samples of effluent discharge were above the permitted biochemical oxygen demand limit.’
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