What are BOD and COD? An explanation of the four methods of wastewater treatment (physical, chemical, physicochemical, and biological treatment).
■What does wastewater treatment technology do? Wastewater treatment technology is a method that separates particles and dissolved substances (such as organic matter) detected as BOD and COD from water, or transforms them into harmless, stable substances (such as CO2) for removal. Treatment methods are divided into four categories: physical treatment, chemical treatment, physicochemical treatment, and biological treatment. ■What do BOD and COD represent? BOD (Biochemical Oxygen Demand) indicates the amount of oxygen consumed by microorganisms when decomposing organic matter, while COD (Chemical Oxygen Demand) indicates the amount of oxygen consumed by oxidizing agents when decomposing organic matter. Higher values mean a reduction in dissolved oxygen in the water, which can adversely affect aquatic organisms. Generally, rivers are regulated by BOD, while lakes and marine areas are regulated by COD. ■How do the four treatment methods differ? 1. Physical treatment: Separates contaminants through processes like sedimentation and filtration. 2. Chemical treatment: Neutralizes contaminants through processes like neutralization and redox reactions. 3. Physicochemical treatment: Combines processes like coagulation-sedimentation and activated carbon adsorption. 4. Biological treatment: Decomposes organic matter using the power of microorganisms. ■Which treatment method should be chosen? The appropriate treatment method or combination depends on the types and concentrations of substances contained in the wastewater. Please feel free to consult with us first.
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