Micropollutants in Wastewater Treatment Plants. Technologies to Eliminate Organic Trace Contaminants. Today’s mechanical-biological treatment plants only inadequately remove organic micropollutants. Advanced technologies are necessary such as ozonation or adsorption on powdered active carbon (PAC) in order to increase removal capacity. These two techniques are being evaluated in various tests on the laboratory level, but also on a large scale. Both ozonation and PA C adsorption are suitable for reducing the emission of organic trace elements from settlement drainage systems into the various bodies of water. This article presents the current knowledge of both technologies for application in municipal wastewater treatment systems.