Treatment of urban waste water; process data wastewater treatment

This table provides information on the functioning of the treatment process of urban wastewater treatment plants: the supply and disposal of contaminants, the purification efficiency achieved and the average values of a number of specific process parameters (= variable with which the purification process can be controlled and optimised). The data is available for the following selections: — type of treatment plant — type and management form of surface water discharged. Data can also be displayed by river basin district. As of 2017, data on heavy metals and process parameters will only be collected in the same years. Data available from: 1981. Status of the figures: The figures in this table are final. Changes as of 12 May 2022: The table is supplemented by figures for 2020. Due to new information about 2019, the total influent freight COD and the amount of pollution units in the fluent both increased by 4 % in 2019 compared to the previous version. This also leads to minor changes in underlying breakdowns in these two parameters. When are new figures coming? The new figures for 2021 will be published in March 2023.