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| Warranty: | 3-5year |
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Wastewater with high COD content includes food COD wastewater, papermaking COD wastewater, refinery COD wastewater, garbage leachate COD wastewater, emulsion COD wastewater, chemical COD wastewater, pharmaceutical COD wastewater, semi-coke COD wastewater, coking COD wastewater, coal tar COD wastewater, etc.
There are many ways to treat wastewater with high COD content. First, the wastewater should be pre-treated. The large particles of organic COD suspended matter should be removed through physical grids or separators. Then, most of the organic COD should be removed by chemical flocculation or oxidation. Finally, the wastewater COD should be discharged up to the standard through biological treatment.
In addition, for extremely high COD wastewater, COD reaches hundreds of thousands of wastewater, this kind of wastewater can be thoroughly treated by evaporation or incineration.
1. Chemical treatment
Chemical treatment can effectively remove organic substances in sewage with high COD. It is simple to operate and effective, and has been widely used. Chemical treatment methods mainly include oxidation, reduction, precipitation and ion exchange. Among them, the oxidation method is the most widely used, and currently there are two main methods: chlorine oxidation and ozone oxidation.
However, chemical treatment has shortcomings such as high cost and difficulty in treating the remaining sludge. At the same time, the treatment effect for high-concentration sewage is limited.
2. Biological treatment
Biological treatment can convert organic matter into harmless substances and has the advantages of low cost and low energy consumption. Biological treatment is mainly divided into two methods: aerobic treatment and anaerobic treatment. It is more common to use aerobic treatment for sewage with high COD.
The disadvantages of biological treatment are that it requires high stability of incoming water quality and has a greater impact on environmental factors such as water temperature and water quality. At the same time, the treatment efficiency is greatly affected, and it is difficult to deal with the sludge generated during the treatment process.
3. Physical processing
Physical treatment methods are often used in pretreatment processes or in combination with other treatments. Physical treatment mainly adopts precipitation, filtration, adsorption and other methods, which are simple to operate, fast in processing speed and stable in treatment effect.
However, physical treatment methods have certain limitations for sewage with high COD. They can only play a preliminary role in separation and filtration, and it is difficult to completely remove pollutants.
Summary: Different treatment methods have their own advantages and disadvantages, and the appropriate treatment method should be selected according to the specific situation. A variety of treatment methods can be combined to achieve better treatment effects. At the same time, more economical and effective solutions need to be explored for the treatment of remaining sludge.
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