api active pharmaceutical ingredient definition
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One of the primary applications of chemical treatment systems is in wastewater treatment. Industrial facilities often generate wastewater laden with contaminants, including heavy metals, organic compounds, and pathogens. Chemical treatment can involve several processes, such as coagulation, flocculation, sedimentation, and disinfection. Coagulation is the process in which chemicals, like alum, are added to the wastewater to help particles clump together into larger aggregates, known as flocs. Once these flocs are formed, they can be removed from the water through sedimentation, where they settle to the bottom of a tank. This step is crucial for reducing suspended solids and turbidity in the water.
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The choice of antioxidant is crucial and can depend on several factors, including the type of plastic material, processing conditions, and the intended application. For instance, polyolefins, which are commonly used in various applications, often benefit from hindered phenolic antioxidants due to their thermal stability and compatibility with the substrate. Meanwhile, engineering plastics like polycarbonate may require different types of antioxidants that can provide protection at elevated temperatures.
antioxidant additives for plastics...