C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/17
C02F 3/12 (2006.01)
Patent
CA 1115435
ABSTRACT A plant for biological purification of waste water The plant is a tank forming an aeration chamber in which waste water is treated with active sludge and is aerated, and which has mounted therein a plate insert defining an upwardly open secondary sedimentation chamber having inclined side walls and an overflow for purified waste water as well as a bottom opening through which precipi- tated sludge flows back to the aeration chamber. Two vertical plates define a central channel in the plate insert, said channel being in communication with the aeration chamber through tubes and causing auxiliary currents to be generated in the tubes and the lower por- tion of the plate insert, said currents contributing towards keeping the bottom opening free from accumulations of sludge.
325239
A/s Hotaco
Fetherstonhaugh & Co.
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