acidic water
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What is COD, and what is the impact of acidic water stripping on COD?
COD stands for Chemical Oxygen Demand; it is recommended to look up information on this topic on Baidu first.
The more potassium hydroxide solution is consumed, the higher the COD of the sample. Acidic water stripping removes the acidic substances from the wastewater, thereby reducing the amount of potassium hydroxide solution required for the same volume of sample, and as a result, the COD decreases.
It involves using chemical oxidants (such as potassium permanganate) to oxidize and decompose oxidizable substances in water (such as organic matter, sulfites, ferrous salts, sulfides, etc.), and then the amount of oxygen consumed is calculated based on the remaining amount of oxidant. Similar to Biological Oxygen Demand (BOD), it is an important indicator of water pollution levels. The unit for COD is ppm or milligrams per liter; the lower this value, the less polluted the water is.
The previous speakers have explained COD very clearly; I’ll talk about the impact of acidic water stripping on COD. Firstly, the effect of the stripping tower on COD is minimal; its main function is to separate hydrogen sulfide and ammonia from acidic water. Before the stripping tower, there is usually an oil remover, which can eliminate petroleum-based substances in the acidic water, thereby effectively reducing its COD. Oil removal is also a key step affecting the operation of the stripping tower.