Wastewater subjected to the process of adjusting to environmental standards or other quality standards.

Three methods are distinguished: mechanical, chemical and biological processes or increased biogene removal (including chemical). For the purpose of calculating the total amount of treated wastewater, only the amount which was subjected to the highest of the mentioned biogene removal method is presented. Therefore, wastewater treated mechanically and biologically should be reported as wastewater treated biologically and the wastewater treated using all methods should be reported as treated using increased biogene removal method.

• Pollutants loads in wastewater discharged to wastewater treatment plant
• Biologically treated wastewater
• Chemically treated wastewater
• Mechanically purified wastewater
• Wastewater treated with increased biogene removal