Decanter Centrifuge Specially For Paper Mill Sewage Treatment
Types Of Decanters
There are several types of decanter centrifuges currently utilized
in the industry, the most widely recognized are vertical,
horizontal and conveyor centrifuges. The principle behind a
decanter centrifuge is based on the theory of gravitational
separation. For example, if you fill a vessel with a mixture of mud
and water, over time the weight of the mud will cause it to settle
down at the base of the vessel. With the mud congealed at the
bottom, the water will be forced upwards, creating a clear
separation between the two.
Description
In a sewage plant, what is the process of using a spiral settling
centrifuge for desliming?
In sewage treatment plant, in the treatment of activated sludge,
the whole process of using spiral settling centrifuge is: through
the high-speed rotating drum, to drive the high-speed rotation of
sludge, and then generate centrifugal force, so that the solid
particles in the sludge settlement is accelerated, and concentrated
on the drum wall. Then, through the spiral, the mud cake is scraped
to the small end of the drum, so that it can be discharged, thus
completing the mud removal work.
What is the advantage of decanter centrifuge to treat the waste
water?
The horizontal screw discharging and settling centrifuge (referred
to as horizontal screw centrifuge) with a fully closed and
continuous operation with a large length-diameter ratio is used as
the main machine of the sewage treatment centrifuge, which has the
following advantages:
1. Fully closed operation, clean and pollution-free site.
2. The amount of flocculant and cleaning water is small, and the
daily operation cost is low.
3. The equipment layout is compact, covers a small area, can
significantly reduce the land acquisition and infrastructure
investment.
Working principle :
Detailed Product Description
| Diameter | 430mm | Voltage : | 220V, 380V,440V,460V |
| Speed | Inverter Control | Electrical Components: | World Famous Brand |
| Operation | Continuous | Separation : | Three phase |
| Bearing | SKF | Material : | SS304, SS316L, SS2205 |
| Control | PLC | Motor : | 2 |
Other Applications :
The 3-phase decanter separates which contains oil into an oil
phase, solids and virtually oilfree waste water. Because of its
high dry matter, the solids can be recycled relatively easily.
In addition, the solids concentration in the waste water is lower
than would be the case if nozzle separators are used in
conventional process.
Advantages :
1. Lower cake transportation costs due to very dry solids
2. Better recovery of nutrients due to very high separation
efficiency
3. Lower fresh water consumption compared to other processes
4. Continuous and fully automatic operation
5. 24 h operating reliability
6. Optimum wear protection
7. Energy saving design
8. Easy to operate
9. Easy to maintain
10. Simple assembly/dismantling
Features :
- All parts coming into contact with the product are made of
stainless steel.
- 3-phase AC motor for controlled torque starting via frequency
converter
- Approximately 80 to 90 % of the oil is recovered.
- Low personnel costs due to continuous and automatic operation.
- Highest g-force for higher solids output
- Adjustable bowl speed via VFD
- Automatic adjustment of differential speed via VFD
- Two motor drive
- Belts for both primary motor and secondary motor
Technological Data :
| Model | Drum diameter mm | Inlet liquid capacity㎥/h | Power of main/auxiliary motor Kw | Weight Kg | Dimension (max) mm |
| LW250 | 250 | 1-4 | 11/4 | 1200 | 2650*720*900 |
| LW(F)250 | 250 | 1-4 | 11/4 | 1200 | 2650*720*900 |
| LW250(W) | 250 | 1~5 | 11/4 | 1300 | 2750*720*900 |
| LW350 | 350 | 5~15 | 22/5.5 | 2000 | 3585*980*1238 |
| LW(F)350 | 350 | 5~15 | 22/5.5 | 2000 | 3585*980*1238 |
| LW350(W) | 350 | 5~18 | 15/5.5 | 2200 | 3412*1090*950 |
| LW(S)350 | 350 | 2~10 | 22/5.5 | 2000 | 3676*980*1238 |
| LW450 | 450 | 5~20 | 30/11 | 3000 | 4380*1080*1360 |
| LW(F)450 | 450 | 5~20 | 30/11 | 3000 | 4380*1080*1360 |
| LW450(W) | 450 | 5~28 | 30/11 | 3200 | 4380*1080*1360 |
| LW(S)450 | 450 | 5~15 | 37/11 | 3200 | 4195*1080*1360 |
| LW520 | 520 | 10~26 | 45/15 | 5000 | 4840*1160*1465 |
| LW(F)520 | 520 | 10~26 | 45/15 | 5000 | 4840*1160*1465 |
| LW520(W) | 520 | 10~35 | 45/11 | 5000 | 4840*1160*1465 |
| LW550W | 550 | 10-45 | 55/11 | 6500 | 5038*1388*1578 |
*** F: Ex-proof, W:Waste water, S: Three phase FS:Ex-- proof and
three phase
FAQ :
Q:The paper mill sewage is treated with a horizontal screw
centrifuge. It is found that there is a little bit more slag and
blockage. How to deal with it?
A:How to judge that the horizontal spiral centrifuge has a little
more slag? Is it compared with the same technical parameters
before? Or did you change another decanter centrifuge or add too
much medicine? Increasing the precision of machine parameters or
the dosage of reagents both can bring about more slag discharging.
In short, the smaller suspended solids that were previously hidden
in the sewage are also separated by centrifugation. If the
pretreatment is not done well, it can also increase the solid
content of the fluid.
We have 2 solutions to solve the condition of more slag. One is to
do a good job of pretreatment to reduce the solid content of the
fluid, and the other is to adjust the differential speed of the
spiral sweeping paddle of the horizontal screw centrifuge to make
the pushing more smooth. We use the juneng horizontal spiral
centrifuge, which is very stable in performance. After more than
two years of use, there is no sudden change in performance.
