In the Advanced Oxidation Process (AOP), we see that these technologies use hydroxyl radicals, the ultimate oxidant for the remediation of organic contaminants in wastewater. As shown below, four types of concept maps are commonly used to visually represent any information: Spider Concept Map, Chronological Concept Map, Flow Chart, and System Maps. EdrawMax Online lets you create all types of concept maps with the help of free templates. With EdrawMax Online, you can fully customize these free concept map templates that can later be exported into multiple formats as required by your project. As you can see in the AOP Concept Map below, Non-thermal plasma can directly generate -OH while maintaining a low temperature, and O3, H2O2, and UV light are also generated; these are necessary for AOP.