| 单词 | biochemical oxygen demand |
| 释义 | > as lemmasbiochemical oxygen demand biochemical oxygen demand n. a standard measure of the amount of dissolved oxygen consumed by microorganisms in a water sample as they decompose organic matter, used as a measure of organic pollutant levels; a test procedure in which this is determined, typically by measuring oxygen levels in a sample before and after a period of incubation in the dark; abbreviated BOD. ΚΠ 1914 A. Lederer in Jrnl. Industr. & Engin. Chem. 6 883/1 In designating properly a test, which gives expression to the demand for oxygen such as is present in streams, one can hardly be criticized for using the expression ‘Biochemical Oxygen Demand’. 1933 Lancet 8 Apr. 758/2 The biochemical oxygen demand of sewage is dependent upon the presence of living agents to enable the ordinary chemical oxygen demand to be satisfied. 1984 K. V. Scott in C. A. Heaton Introd. Industr. Chem. vii. 252 The biochemical oxygen demand..should be reduced to 20 mg/l..before discharge to a body of water. 1996 J. Bartram & R. Ballance Water Quality Monitoring vii. 121 The biochemical oxygen demand..is an empirical test, in which standardised laboratory procedures are used to estimate the relative oxygen requirements of wastewaters, effluents and polluted waters. < as lemmas |
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