|
Simulations of Secondary Clarifiers
 |
Videos available (Microsoft Media Video) |
|
Dry Weather and Stormwater Load
|
Computation of G-value
|
Simulation of a Blade Scraper
|
|
|
|
|
|
Simulation of a Flight Scraper
|
Simulation of a Suction Collector
|
Inlet Construction
|
|
|
|
|
Example No. 1: Transient Simulation at Dry Weather and Stormwater Load
- istribution of the sludge concentration in a circular secondary settling tank
- upper picture: conventional inlet, lower picture: optimised adaptive inlet hydrograv adapt
|
| |
dry weather
sludge concentration
|
classification into concentration zones
blue: clear water zone
green: diluted sludge XAT > X > XCW sludge concentration does not contribute to sedimentation
red: settling zone X > XAT
|
| |
|
|
|
(Please click on the picture to play the animation)
|
|
Stormwater
|
 |
(Please click on the picture to play the animation)
|
Example No. 2: 3D-Simulation of a Distribution Construction prior to Secondary Settling Tanks
- flow velocities in a distribution construction prior to secondary settling tanks
- determination of G-value by hydrograv
- the animation shows sequentially the three zones to classify G-value G < 15 s -1 (not relevant), 15 < G < 50 s -1 (non-critical), and G > 50 s -1 (critical, disintegration of flocks)
|
Example No. 3: Simulation of a Blade Scraper
- distribution of the sludge concentration in a rectangular secondary settling tank equipped with blade scrapers as sludge removal system
- comparison of two different blade heights
- optimisation of the blade height by hydrograv
(Please click on the picture to play the animation)
|
Example No. 4: Simulation of a Flight Scraper
- distribution of the sludge concentration in a rectangular secondary settling tank equipped with a flight scraper as sludge removal system
- additional placement of perforated plates
- optimisation of the sludge removal system by hydrograv
(Please click on the picture to play the animation)
|
Example No. 5: Simulation of a Suction Collector
- distribution of the sludge concentration in a rectangular secondary settling tank equipped with a suction collector as sludge removal system
- enlarged detail of the inlet area
- chart in lower part: progression in time of the internal loads
- automatic determination of the optimal inlet geometry by hydrograv
(Please click on the picture to play the animation)
|
Example No. 6: 3D-Simulation of an inlet construction
- streamlines and flow velocities in the inlet construction of a circular secondary settling tank
- optimisation of the inlet geometry by hydrograv
(Please click on the picture to play the animation)
|
|
