Definition: Septic tank

Category: Environment

Closed sedimentation tank in which settled sludge is in direct contact with the wastewater flowing through the tank and the organic solids are partially decomposed by anaerobic bacterial action. 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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