Types of plants, activated sludge plants
The same applies for the SBR-plant where the tank part of the time is without
aeration and functions as a settling tank.
For all process calculations, the calculated aeration tank volume, V'b is used. For
example for the calculation of sludge loading, removal of organic matter, etc.
For the a and b types of plants in Fig 4.7 it applies that the water volume in the tank
varies with time which complicates possible calculations.
Fig 4.8 shows a plant with integrated aeration tank and settling tank.
Fig4.8
The settling tank is not always separate. Here it is integrated in the aeration tank
(BIOLAK-Wax treatment plant). This is a low-loaded activated sludge plant with
nitrification and denitrification . Air is introduced through floating tubes with suspended diffusers.
Example4.6
130
An oxidation ditch plant as shown in Fig 4.7a holds a total volume of 1,200 m 3 just after withdrawal of settled wastewater. The plant has the following operational cycle:
2.5 h aeration
0.5 h settling
The same applies for the SBR-plant where the tank part of the time is without
aeration and functions as a settling tank.
For all process calculations, the calculated aeration tank volume, V'b is used. For
example for the calculation of sludge loading, removal of organic matter, etc.
For the a and b types of plants in Fig 4.7 it applies that the water volume in the tank
varies with time which complicates possible calculations.
Fig 4.8 shows a plant with integrated aeration tank and settling tank.
Fig4.8
The settling tank is not always separate. Here it is integrated in the aeration tank
(BIOLAK-Wax treatment plant). This is a low-loaded activated sludge plant with
nitrification and denitrification . Air is introduced through floating tubes with suspended diffusers.
Example4.6
130
An oxidation ditch plant as shown in Fig 4.7a holds a total volume of 1,200 m 3 just after withdrawal of settled wastewater. The plant has the following operational cycle:
2.5 h aeration
0.5 h settling