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Definition: Tertiary treatment (of waste water)
Category: Environment
Treatment (additional to secondary treatment) of nitrogen and/or phosphorous and/or any other pollutant affecting the quality or a specific use of water: microbiological pollution, colour etc . For the purpose of this questionnaire, the following minimum treatment efficiencies define a tertiary treatment: organic pollution removal of at least 95% for BOD and 85% for COD, and at least one of the following: - nitrogen removal of at least 70% - phosphorus removal of at least 80% - microbiological removal achieving a faecal coliform density less then 1000 in 100 m. https://ec.europa.eu/eurostat/ramon/statmanuals/files/OECD_ESTAT_JQ_Manual_version_4_2018.pdf
Source:
Eurostat, "Data Collection Manual for the OECD/Eurostat Joint Questionnaire on Inland Waters and Eurostat regional water questionnaire", version 4 (2018), Luxembourg, 2018
Eurostat, "Data Collection Manual for the OECD/Eurostat Joint Questionnaire on Inland Waters and Eurostat regional water questionnaire", version 4 (2018), Luxembourg, 2018
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