Clarifier 2 : In waste-water treatment, a settling tank and/or centrifugal acceleration device which mechanically removes settleable solids from wastes. (Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}