Definition: Secondary treatment (of waste water)

Category: Environment

Treatment of wastewater by a process generally involving biological treatment with a secondary settlement or other process, resulting in a BOD removal of at least 70% and a COD removal of at least 75% . 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
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