Significance of online BOD monitor to control water pollution

On-line bod monitoring instrument Oxygen demand or biochemical oxygen demand refers to the dissolved oxygen consumed by microorganisms to decompose certain oxidizable substances in water under specified conditions, especially the biochemical process of decomposing organic matter. Generally, microorganisms are cultivated at a certain temperature within a specified period of time, and the consumption of dissolved oxygen in water is measured. Usually, five days are used, which is called five-day biochemical oxygen demand, and recorded as BOD5. BOD is a comprehensive indication of the content of aerobic pollutants such as organic matter in water. Among all kinds of pollutants in the water environment, oxygen-consuming pollutants are still an important factor affecting the water quality of the water body. The main hazard is the consumption of dissolved oxygen in the water, which leads to the deterioration of the water quality and affects the self-purification ability of the water body. The self-purification ability of water mainly depends on the biological reaction system and dissolved oxygen. Anaerobic organisms cannot exist in large quantities in nature, and mainly exist at the bottom of water bodies, and the anaerobic reaction generally proceeds with denitrification (release nitrogen), while most aerobic organisms are difficult to obtain nitrogen nutrition, and must carry out nitrogen fixation, that is, nitrification reaction . Oxygen dissolves in water to form dissolved oxygen. A large number of aerobic microorganisms in water consume dissolved oxygen to synthesize organic pollution into their own life components, that is, to degrade pollutants. This is the self-purification characteristic of water. Excessive BOD in the water body will cause a large number of aerobic bacteria, aerobic protozoa and plants to multiply, and quickly consume the oxygen in the water body, resulting in the death of fish and shrimp, followed by a large number of anaerobic bacteria. The anaerobic biological reaction in the water body will release toxins, and the water body will smell bad, causing algal blooms and red tides. This situation has exceeded the limit of the self-purification ability of the water body and can only be recovered through technical means. The online BOD monitor can indicate the dissolved oxygen consumed by the decomposition of organic matter in water, which is in line with the actual situation of water body self-purification and most of the technical process routes of sewage treatment. Therefore, the measurement of BOD has more important significance for the control of water body pollution.
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