Definition of biochemical oxygen demand in English:

biochemical oxygen demand

(also BOD)

Pronunciation /ˌbīōˌkeməkəl ˈäksəjən diˌmand/ /ˌbaɪoʊˌkɛməkəl ˈɑksədʒən dɪˌmænd/


  • 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.

    ‘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.’
    • ‘Maintaining the biochemical oxygen demand, nitrogen and organic matter content of wastewater outside the limits that are favourable for mosquito breeding is very helpful.’
    • ‘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.’
    • ‘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.’
    • ‘Treatment plants are expected to meet lower discharge requirements for carbonaceous biochemical oxygen demand, total suspended solids, and nutrients.’
    • ‘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.’
    • ‘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.’
    • ‘Sand bioreactor effluent is typically very clear with low biochemical oxygen demand and ammonia levels.’
    • ‘The results are expressed in terms of oxygen so that they can be compared directly to the results of biochemical oxygen demand testing.’