The amount of dissolved oxygen consumed by the organic matter in the water under the action of microorganisms is called the biochemical oxygen demand. The more organic matter in the donkey drinking water, the greater the biochemical oxygen demand, but related to the temperature, within a certain range. The higher the temperature, the greater the bio-oxidation and the shorter the time required to complete the entire process. In actual work, often at 20 °C, after 5 days of cultivation. The amount of dissolved oxygen (mg/L) reduced in 1 L of water is expressed as 5 days of biochemical oxygen demand (BOD). In an uncontaminated natural body of water, BoD' should be between 1 and 2 m9 gL. Under normal circumstances, when the BOD of water is less than 3 mg/L, the water quality is good; when the water quality is 6 mg/L, the water quality is not good; when it is more than 10 mg/L, the water quality is already very poor, and the dissolved oxygen in the water is very little or even completely No.
Can relatively reflect the content of organic matter in water, it is an important indicator to evaluate the meat donkey drinking water pollution. However, if the water contains nitrates, nitrites and other reducing inorganic substances. It will increase the biochemical oxygen demand of water. At this time, it must be comprehensively analyzed.
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