NEW!

Four 44 m diameter final clarifiers added to existing eight clarifiers (see below).

Side wall depth 4.1 m, uniform bottom slope 8%. Peripheral drive. One-and-a quarter spiral scrapers (at least two full arms would be more appropriate), variable speed control. Maximum peripheral velocity 0.085 m/s.

Flocculation well 10 m dia. Energy Dissipation inlet.

Single weir effluent launder mounted on the inner side of the wall. Stamford baffle.

Maximum operational overflow rate 1,65 m/h, design overflow rate 2 m/h, MLSS around 3 g/l.

Weir loading rate was not considered to be a valid parameter for design.

Stamford baffle mounted on launder.

OLD!

Eight final clarifiers built in the sixties. 43 m dia, side wall depth 2.3 m.

Note the light cage-type bridges! 

Inboard double weir launders placed at 2/3 of clarifier radius. Outer, wall mounted launders, were blinded to combat the density current lifting suspended solids over the outer weir.

Traditional small size inlet well, later modified to deep inlet. Plow type, single arm scraper.