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vanex@vanex.sk
The fundamental element of the sludge dewatering lines from the production portfolio of VANEX is the belt press. Dewatering is continuous with the following products:
· solid element – sludge cake, that can be transported by common transportation devices
· liquid element – filtrate with the possibility of further processing
The requirements for the operation of the belt press are:
· pressurized air circa 1m3/hr; 0,60 MPa;
· pressurized water for splashing of filter belts circa 4 ÷ 10 m3/hr (VX-GORO 6 ÷ 12, VX - 6 ÷ 12) a 12 - 16 m3/hr (VX-15 a 20), pressure 0,6–0,8 MPa;
· power supply 3/N/PE/AC 400/230 V 50 Hz TN-S, installation input power of the belt press 2,25 kW (VX-GORO), 2,25 kW (VX-6, 6A, 8 a 10) and 3,00 kW (VX-15 and 20) including flocculation plant VX-FZ;
· flocculant solution for increasing of separation efficiency of the belt press.
The sizes and informative outputs of the belt presses manufactured by VANEX are given in the table.
The belt presses process sludge in four main interlocking technological zones:
Sludge is mixed with flocculant solution, spewed and the part of the filtrate is released.
This process is running in the flocculation plant VX-FZ and partially in the input hopper of the belt press on the upper filter belt.
In this zone sludge is gravitationally dewatered after its intake onto the filter belt.
The gravity zone on the upper filter sieve of VX belt presses is prolonged approximately up to 6m (except for the smallest belt presses).
Sludge is upset from the upper sieve on to the clean bottom filter belt of the continuing gravity zone.
In this zone the biggest volume of the filtrate flows out with the lowest pollution.
In this low-pressure zone there is the upper belt continuously pushed to sludge resulting in further filtrate drainage.
The sludge, which is closed between the filter belts, is lead hrough the roller system. As the pressure continuously increases, further filtrate continuously drains.
The final pressed out sludge is after passing through the press scrapped from the filter belts by plastic scrapping laths.
The expected dry matter output of the sludge cake is 18–35% (municipal sludge).
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Another possibility of dry matter output increase is a use of high-pressure VT press, which is mainly used when processing industrial sludge. The output dry matter of sludge cake from this type of the belt press is higher by 5–20%, depending on the type of pressed medium.
The output and quality parameters of the belt press are dependent mainly on physical properties of sludge, type of applied flocculants and the sieve as well as the quality of attendance.
Within our delivery we optimize individual parameters including selection of appropriate flocculants.
The construction of belt presses is backed by the long-time knowledge and skills from construction, production and usage of belt presses for pressing of different kinds of sludge.
The main construction parts of the belt presses are:
· frame
· air system
· rollers, gutters,
· electricity system
· hoppers
· filter sieves (2 pcs),
· filtrate lead-in
· propulsion unit.
One of the main characteristics of VX belt presses is that corrodible material such as gutters, hoppers, covers etc. are made of polypropylene.
The surface treatment of the press is metallized with 100micrometers of zinc. This is coated with 2 layers of two-component epoxide coating composition indurated with polyamide with high content of solid particles and low water permeability.
The speed of filtrate sieves is regulated with the frequency converter.
Regulation and tension of the filtrate sieves of the belt press is ensured through the air system.
VX Belt presses have individual propulsion for bottom and upper sieve without chain gearing. This solves the problems with unequal filter belt movement and incipient "bags" of the filtrate belts, which often result in their damage.
If required the whole belt press can be made in stainless version.
|
Type of Belt Press
|
The Belt Press size
(l x w x h) (m) |
Weight
(kg)
|
Filter belt width
(m)
|
Informative output of the Belt Press |
|
|
kg D.S./h |
m3/h |
||||
|
VX – GORO 6V |
3,20 x 1,40 x 1,85 |
950
|
0,60
|
20 – 120
|
0,5 – 3,0
|
|
VX – GORO 8V
|
3,20 x 1,60 x 1,85 |
1 100
|
0,80
|
30 – 200
|
0,8 – 5,0
|
|
VX – GORO 10V
|
3,20 x 1,80 x 1,85 |
1 250
|
1,00
|
40 – 280
|
1,0 – 7,0
|
|
VX – GORO 12V
|
3,20 x 2,00 x 1,85 |
1 350
|
1,20
|
50 – 344
|
1,2 – 8,6
|
|
VX – 6A
|
3,35 x 1,61 x 1,80 |
1 150
|
0,60
|
60 – 200
|
1,5 – 5,0
|
|
VX – 6N
|
4,62 x 1,75 x 1,85 |
2 220
|
0,60
|
80 – 240
|
2,0 – 6,0
|
|
VX – 8N
|
4,62 x 1,95 x 1,85 |
2 580
|
0,80
|
160 – 400
|
4,0 – 10,0
|
|
VX – 10N
|
4,62 x 2,15 x 1,85 |
2 940
|
1,00
|
220 – 520
|
5,5 – 13,0
|
|
VX – 12N
|
4,62 x 2,35 x 1,85 |
3 300
|
1,20
|
280 – 600
|
7,0 – 15,0
|
|
VX – 15N
|
4,98 x 2,39 x 2,36 |
5 580
|
1,50
|
360 – 800
|
9,0 – 20,0
|
|
VX – 20N
|
4,98 x 2,89 x 2,36
|
6 580
|
2,00
|
500 – 1 120
|
12,5 – 28,0
|
