Gaois

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  1. SCIENCE|natural and applied sciences|physical sciences|chemistry|analytical chemistry · ENVIRONMENT|natural environment|physical environment|aquatic environment|water

    #628142

    IATE #1427092
    éileamh bithchemiceach ar ocsaigin Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    biochemical oxygen demand | biological oxygen demand | BOD
    en
    Definition amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic (oxygen is present) conditions at a specified temperature Reference "USGS. Water Science School. 'Biological Oxygen Demand (BOD) and Water' (23.5.2023)"
    Comment There are two stages of decomposition in the BOD test: a carbonaceous stage and a nitrogenous stage (fig. 7.0-1). - The carbonaceous stage, or first stage, represents that portion of oxygen demand involved in the conversion of organic carbon to carbon dioxide. - The nitrogenous stage, or second stage, represents a combined carbonaceous plus nitrogeneous demand, when organic nitrogen, ammonia, and nitrite are converted to nitrate. Nitrogenous oxygen demand generally begins after about 6 days. For some sewage, especially discharge from wastewater treatment plants utilizing biological treatment processes, nitrification can occur in less than 5 days if ammonia, nitrite, and nitrifying bacteria are present. In this case, a chemical compound that prevents nitrification should be added to the sample if the intent is to measure only the carbonaceous demand. The results are reported as carbonaceous BOD (CBOD), or as CBOD5 when a nitrification inhibitor is used.The standard oxidation (or incubation) test period for BOD is 5 days at 20 degrees Celsius (°C) (BOD5).
    BOD
    mul