BOD (abbreviation of Biochemical Oxygen Demand): Biochemical oxygen demand or biochemical oxygen demand (generally referred to as five-day chemical oxygen demand), a comprehensive indicator of the content of aerobic pollutants such as organic matter in water.
Explain the total amount of dissolved oxygen in the water consumed by the organic matter in the water due to the biochemical action of microorganisms, which is inorganicized or gasified. Usually, the water sample is filled in a completely closed dissolved oxygen bottle and cultured in the dark at 20 ° C for 5 days.
The mass concentration of dissolved oxygen in the water sample before and after the culture was measured, and the difference in the mass concentration of dissolved oxygen before and after the culture was determined.
The amount of dissolved oxygen consumed per liter of sample was calculated and expressed in the form of BOD5. BOD rapid tester measurement principle: microbial membrane electrode method
Its unit is ppm or mg/L. The higher the value, the more organic pollutants in the water and the more serious the pollution.
In order to make the test data comparable, a time period is generally specified.
During this time, the microorganisms are cultured with water at a certain temperature, and the dissolved oxygen consumption in the water is measured. Generally, five days is used, which is called the five-day biochemical oxygen demand, which is recorded as BOD5. The larger the value, the more organic matter is contained in the water, so the pollution is more serious.
BOD, Biochemical Oxygen Demand (BOD) is an environmental monitoring indicator used to monitor the pollution of organic matter in water. Generally, organic matter can be decomposed by microorganisms, but microorganisms need to consume oxygen when decomposing organic compounds in water. If dissolved oxygen in water is insufficient to supply microorganisms,
The water body is in a state of pollution. BOD is an indicator of environmental protection.
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