Sulzer Nopon disc diffuser system KKI 215
Membrane disc diffusers for reliable and energy-efficient fine-bubble aeration of tanks in wastewater treatment plants. Suitable for normal continuous aeration systems as well as where intermittent aeration is required, e.g. biological nutrient removal and SBR processes.
Features
- Self-cleaning EPDM membrane with slits;
- Membrane is fixed by a threaded screw-on ring;
- Elastic non-return valve;
- Sulzer Nopon wedge piece fixing to the pipe means that no glue, solvent or welding is needed in assembly;
- Thread based fixing available as an option;
- Wedge piece fixing makes it easy to increase, decrease or relocate diffusers when process requirements change;
- Applicable to various pipe materials and dimensions;
- Option for deep basins;
- Possibility for future increase of aeration capacity by installing 300 mm PRF retrofit discs on existing KKI bodies;
- Inlet air temperature is up to 80°C.
Working principle
The membrane bulges and slits open during aeration by the pressure of compressed air. The support plate distributes the air evenly over the entire surface of the membrane. Air is spread into small bubbles, when released through the membrane. When the air flow is turned off, the pressure of the water above presses the membrane disc tightly to the support plate closing the small slits on the membrane. The non-return valve closes and makes sure that no water enters the pipeline.
Components and materials
| |
Description |
Material |
| 1 |
Main body |
uPVC |
| 2 |
Wedge piece |
uPVC |
| 3 |
Support plate |
Glassfiber reinforced polypropylene |
| 4 |
Screw-on ring |
uPVC |
| 5 |
Support part |
uPVC |
| 6 |
Membrane disc |
EPDM |
| 7 |
Non-return valve |
EPDM |
| 8 |
O-Ring |
NBR |
Model range (wedge attachment)
| |
KKI 215 D90 |
KKI 215D D90 |
KKI 215 D88,9 |
KKI 215 4” |
| Pipe |
90mm PVC |
90mm PVC |
88,9mm SS |
NS4” PVC |
| Main body |
HSA 215 |
HSA 215 |
HSA 215 |
HSA 4 |
| Wedge piece |
HSK 215 |
HSK 215 |
HSK 215 |
HSK 4 |
| Support plate |
HTL 215 |
HTL 215 |
HTL 215 |
HTL 215 |
| Screw-on ring |
HKR 215 |
HKR 215 |
HKR 215 |
HKR 215 |
| Support part |
- |
HTO 215 |
- |
- |
| Membrane disc |
HIK 215 |
HIK 215 |
HIK 215 |
HIK 215 |
| Non-return valve |
HVK 215 |
HVK 215 |
HVK 215 |
HVK 215 |
| O-Ring |
HOR 19 |
HOR 19 |
HOR 18 |
HOR 19 |
Model range (thread attachment)
| |
KKI 215 R½ |
KKI 215 R½K |
KKI 215 BSF½ |
| Fitting |
R½ cylindrical thread (ISO 228/1) |
R½ taper thread (ISO 7/1) |
BSF½ thread (½”-16 BSF) |
| Main body |
HSA 215 R½ |
HSA 215 R½K |
HSA 215 BSF½ |
| Support plate |
HTL 215 |
HTL 215 |
HTL 215 |
| Screw-on ring |
HKR 215 |
HKR 215 |
HKR 215 |
| Membrane disc |
HIK 215 |
HIK 215 |
HIK 215 |
| Non-return valve |
HVK 215 |
HVK 215 |
HVK 215 |
| O-Ring |
HOR 19 |
HOR 19 |
HOR 19 |
Diffuser data
| Design air flow range |
0,5-4,0 m3/h/diffuser (x(+20 °C; 1 013 mbar) |
| Diffuser level |
250 mm (xx |
| Air temperature, max |
+ 80°C |
| Max/min assembly depth |
3 - 8 m (optimal) (xxx |
| Diffuser diameter |
215 mm |
| Disc surface area |
0,025 m2 |
| Size of bubbles |
1 - 3 mm |
| Diffuser weight |
0,770 kg |
| Max/min interval, c/c |
1,0 / 0,35 m |
x) When wastewater contains chemicals harmful to EPDM or when water temperature is > 30°C or air temperature is close to 80°C, a lower maximum air flow should be used. A peak value of 5 m3/h can be used for max. of 15 min only e.g. for cleaning the membrane.
xx) Recommended measure from basin bottom to diffuser top
xxx) Model KKI 215D D90 is suited for deeper basins. Consult Sulzer on depths outside the range
