Primary Sludge Excellent cutting result , twin-shaft grinder for
WWTP
A major sewage treatment plant experienced several instances of
pump faults upon their change in processes, which causes an
increase in dry matter content of the primary sludge that resulted
in agglomerated solids clogging up the pumps.
Following the successful implementation of Accuvon HAP120 twin
Shaft Grinder through various tests; for the reduction of the
primary sludge;the Accuvon HAP120 twin Shaft Grinder was installed
on the suction side of two primary sludge pumps that handle the
sludge alternately.
The excellent grinding result, interchangeable blades with
different profiles that allows different degrees of communition,
space-saving design etc… had convinced the sewage plant operators to replace all
existing shredders by our Accuvon twin Shaft Grinders.
operating principle
The dual-shaft grinder was designed using the principle of the
Accuvon Rotary Lobe Pump. Instead of the rotating lobes, this
device has interconnecting cutting blades set on the hexagonal
carrier shaft and attached with a central bolt.
The different circumferential speeds and blade configurations
ensure excellent cutting results.
Components
1 Quick-release cover
2 Axial casing protection
3 Central clamping unit
4 Spacer rings
5 Cutting blades
6 Shaft seal
7 Block casing
8 Quench and control chamber
9 Carrier gear unit and gear reducer
blade configurations
The degree to which the Accuvon Crusher cuts is determined by the
choice of blade configuration, the teeth profiles, the blade widths
and the flow speed.
Currently, a choice of nine different blade configurations can be
selected depending on the assignment. The different circumferential
speeds of the shafts create a tearing/cutting result. The use of
hardened steel ensures the blades are kept sharp for longer.
Defective cutting blades can be individually replaced.
Control technology
The Crusher generally runs in reverse for 5 seconds upon starting –
afterwards changing to the original direction of rotation
Reversing in the event of overload (blockages or clogging):
Reversing upon reaching 70% of the motor power rating (value can be
freely configured via the control unit)
Alert: when reversing five times within ten minutes due to overload
Counter which runs in the background to record the number of
load-dependent reversals
The Accuvon control technology guarantees trouble-free operation of
the Crusher.
design options
combined with a rotary lobe pump; can also be combined with other
pumps
advantages
- Reliable, powerful, robust
- Crushing of Large Solids
- Compact, low-on-space design
- Energy efficient, no internal friction
- Cutting result can be very easily adjusted
- Long service life
- Different blades available – for variable cutting results
- Cutting unit very easy to replace
- Ease of maintenance
- Pressure-resistant, up to 12 bar
- Submersible model also available
Macerating Technology data:
| Medium | Primary Sludge |
| Flow Rate | Up to 40 m³/h |
| Speed | 120rpm |
| Temperature | 20 °C |
| direction | Reversible operation |
| Solids Content | 3 – 5 % TS |
Application data of Dual-shaft grinder:
| Type | Dual-shaft grinder |
| Grinder | Crusher |
| Casing | Grey cast iron |
| Casing protection plates | Hart metal |
| O-Rings | NBR |
| Shaft sealing | SiSiC / SiSiC |
| Knife geometries | long shaft F16Z, short shaft G10Z |
| Drive | 3 kW |
Model data sheet:
| Model | Flow(max) | velocity of flow | Standard DN mm | Optional DN mm | Standard power | Optional power |
| HAP80 | 25m³/h | 3m/s | DN80 | DN100 | 3Kw | 4Kw |
| HAP100 | 40m³/h | 3m/s | DN100 | DN125 | 3Kw | 4Kw |
| HAP120 | 60m³/h | 3m/s | DN100 | DN125 | 3Kw | 4Kw/5.5Kw |
| HAP140 | 80m³/h | 3m/s | DN125 | DN150 | 3Kw | 5.5Kw |
| HAF125 | 100m³/h | 3.1m/s | DN125 | DN150 | 7.5Kw | 11Kw |
| HAF150 | 150m³/h | 3.1m/s | DN150 | DN200 | 11Kw | |
| HAF200 | 200m³/h | 3.1m/s | DN200 | DN250 | 11Kw | |
| HAX250 | 300m³/h | 2.4m/s | DN250 | DN300 | 18.5Kw | |
| HAX300 | 500m³/h | 2.4m/s | DN300 | DN350 | 18.5Kw | |
