1. BIODISCS (RBC)
Rev

2. Plant configuration PRIMARY TREATMENTS RBC (BOD REMOVAL) FINAL
SEDIMENTATION
SEWAGE
PURIFIED
WATER
SLUDGE
(NITRIFICATION)

3. Post-Denitrification
PRIMARY
TREATMENTS
AEROBIC
RBC
ANOXIC
FINAL
SEDIMENTATION
SEWAGE
METHANOL
(BOD ADDITION)
PURIFIED
WATER
SLUDGE
Post-Denitrification
Pre-Denitrification

4. The biological process
WATER
RBC media
biological growth
oxygen
carbon dioxide
final product
sludge particles
liquid film
AIR

5. Side view
cover
shaft
gearmotor
media

6. Scheme and front view rotation RBC water media media support
about 40% is
submerged
tank 
shaft

7. Hollow shaft and radial structure

8. Hollow shaft under manufacturing process

9. made of polyethylene copolymer
Plastic media
truncated cones
made of polyethylene copolymer

10. Plastic media density Standard density Medium density High density
DISCS
CLEARANCE
19 mm
16 mm
12 mm
APPLICATION
High load
BOD5 500  600 mg/l
Medium/low load
BOD5 300  400 mg/l
Nitrification

11. Critical situations for RBC
Inlet overload  bacteria overgrowth  rotor weight increase
No water in the tank  no buoyancy (Archimedian) force applied  rotor supports overstressed
Energy black-out  unbalanced bacteria growth  unbalanced weight on the rotor

12. FEM (Finite Elements Method) analysis
Sernagiotto design
FEM (Finite Elements Method) analysis
Oversized and reinforced shaft and radial structure  heavy duty design
Qualification stress test

13. Qualification stress test
Rotation: 3 times nominal speed
Applied load: 2 times max
operating load (100% clogging)
Unbalanced rotation
TARGET: over hours test time equivalent
to hours regular operating time
RESULT: POSITIVE, no defects

14. Technical data
MEDIA (equivalent area)
Population equivalent*
*only BOD removal, medium density and municipal wastewater
MODEL
Overall diameter
Rated power
Number of sectors
Standard density
Medium density
High density
D 4000 C
4000 4 2
5650
6910
8475
D 2300 C
2300
1.1
1150
1380
1725
D 2300 M
2.2 3
2070
2587
D 3600 M
3600
6967
8360
10450
D 3600 L
5.5
9290
11150
13935
D 3600 C
4645
5575
D 4000 M
10365
12713
D 4000 L
11300
13820
16950 mm kW m2
P.E.
U.M

15. Biodisc vs Activated sludge
Sludge recirculation
Operator attendance
Space requested
Final settling tank
Energy consumption
Modular configuration
Environmental impact
Bulking
Capital costs NO
LIMITED
LIMITED (1/2 - 1/5)
LOW (1/2 - 1/3)
YES
LOW
HIGH
YES
LARGE
HIGH NO
LOW

16. Nitrification and denitrification

17. Plant assembling

18. Installation

19. Municipal application
Customer
SASSARI WWTP - Italy
Model: (4) RBC D 3600 L-S
(4) RBC D 3600 L-N2
(2) RBC D 3600 L-N
Inlet Outlet
Flow rate: m3/h
COD: mg/l COD:  160 mg/l
BOD5: mg/l BOD5:  40 mg/l
Suspended solids: 450 mgl Suspended solids:  80 mg/l

20. Municipal application
Customer
POSITANO WWTP (SA) - Italy
Model: (5) RBC D 3600 STD
Inlet Outlet
Flow rate: m3/h
COD: mg/l COD:  160 mg/l
BOD5: mg/l BOD5:  40 mg/l
Suspended solids: 450 mgl Suspended solids:  80 mg/l

21. Municipal application
Customer
E.D.A.R. AGUILAR
DE CAMPOO WWTP
- Spain
Model: (5) RBC D 4000 L-MD
Inlet Outlet
Flow rate: m3/h
BOD5: mg/l BOD5:  25 mg/l
Suspended solids: 143 mgl Suspended solids:  35 mg/l

22. Municipal application
Customer
COLLINSTOWN WWTP
- Ireland
Model: (2) RBC D 2300 M-N1
Inlet Outlet
Flow rate: m3/h
BOD5: mg/l BOD5:  25 mg/l
Suspended solids: mgl Suspended solids:  35 mg/l

23. Municipal application
Customer
LAS MATAS -
LOS PENASCALES WWTP - Spain
Model: (4) RBC D 3600 L-S
Inlet Outlet
Flow rate (average): 83 m3/h
BOD5: mg/l BOD5:  25 mg/l
Suspended solids: 400 mgl Suspended solids:  35 mg/l

24. Municipal + industrial application
Customer
CONSORZIO
VILLA BASILICA E PESCIA
Veneri WWTP (PT) - Italy
Model: (24) RBC D 3600 L-S
(8) RBC D 3600 L-N
Inlet Outlet
Flow rate: m3/h
COD: mg/l COD:  160 mg/l
BOD5: mg/l BOD5:  40 mg/l
Suspended solids: 180 mgl Suspended solids:  40 mg/l

25. Industrial application (paper mill)
Customer
MOMO PAPER MILL (NO) -
Italy
Model: (4) RBC D 4000 L-S
Inlet Outlet
Flow rate: 65 m3/h
COD: mg/l COD:  160 mg/l
BOD5: mg/l BOD5:  40 mg/l
Suspended solids: 65 mg/l Suspended solids:  80 mg/l

26. Industrial application (dairy)
Customer
3 "C"
Ghilarza (Sardinia)) - Italy
Model: (2) RBC D 3600 L-N
(4) RBC D 3600 L-S
Inlet Outlet
Flow rate: 20 m3/h
COD: mg/l COD:  160 mg/l
BOD5: mg/l BOD5:  40 mg/l
Suspended solids: mgl Suspended solids:  80 mg/l

27. Industrial application (textile)
Customer
TINTORIA FINISSAGGIO 2000
Masserano (VC) - Italy
Model: (1) RBC D 3600 L-S
Inlet Outlet
Flow rate: 60 m3/h
COD: mg/l COD:  160 mg/l
BOD5: mg/l BOD5:  40 mg/l
Suspended solids: 66 mgl Suspended solids:  80 mg/l

28. RBC D 2300 “Package”