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The mention of 55%, 80%, and 10% in relation to oil seals might reflect various metrics or considerations concerning their performance and application. For example, in many mechanical systems, seals can be categorized based on their efficiency, effectiveness in preventing leakage, and their material composition. A 55% rating might refer to a baseline performance measure for standard oil seals, whereas an 80% rating could indicate high-performance seals designed for rigorous applications. On the other hand, a 10% figure could relate to the failure rate or the operating conditions under which these seals can be compromised.
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Chemical treatment processes involve the addition of chemicals to water or wastewater to facilitate the removal of contaminants. One of the most widely used chemical treatments is chlorination, which involves adding chlorine or chlorine-based compounds to disinfect water by killing pathogens. However, this method must be carefully managed, as excessive chlorine can lead to the formation of harmful by-products.
physical chemical treatment of water and wastewater pdf
