This document discusses a rotary press system for dewatering sludge from municipal and industrial applications. The system uses polymers to flocculate sludge, which is then fed into channels between screens that apply pressure to extract water from the sludge, producing a dry cake. The rotary press system provides constant dewatering results for sludges with solids content from 0.1% to 18% using a continuous, flexible process with low operation and maintenance costs.

1. fagoredergarden
Sludge Dewatering Equipments
Municipal and Industrial Applications

2. 3
1
5
7
6
8
2 4
rotary press system
process
1 Preliminary analysis on the lab allow identifying the most
adequate polymers for the press and required quantity to reach
optimum results.
The polymer 2 and the sludge 3 are mixed within the
flocculator unit 4 at a pre-set speed based on sought
productivity and cake dryness.
The flocculated sludge is then fed at low pressure into the
channel for dewatering 5 . The flocculated sludge builds
up in the channel between two filtering screens made of
stainless steel chrome plate until such moment where
enough pressure is generated to open the outlet gate 7 .
The frictional force of the slow moving screens (up to 2.5 rpm),
coupled with the controlled outlet restriction, results in the
extrusion of a very dry cake 8 , and the extraction of the water 6
with a high capture rate (>95%).
polymer
sludge
washing
filtrate cake
inside the channel
floculator for polymer and sludge mixing
.. Constant dewatering results.
.. For sludge with solids content as low as
0.1% up to 18%.
.. Continuous dewatering process.
.. Flexible system for its scalability:
.. Productivity according to number of
channels.
.. Progressive investment: extend
your equipment’s capacity at any
time.
.. Independent channels.
.. Easy start-up and shut-down procedures.
.. Continuous process with little supervision
requirement.
.. Can be fully automated and remotely
controlled.
.. Low operation and maintenance costs
(O&M).
.. Savings in soundproofing and insulation
elements.
.. Totally enclosed with reduced odour, noise
and H2
S concerns.
characteristics

3. 1
B
A C
2
4
5
6
I0
I0
+O&M
0 1 2 3 4 5
COST
T I M E ( Y E A R S )
advantages
technical specifications
1. Dewatering unit
2. Gear unit
3. Motor
4. Feed inlet
5. Filtrate discharge
6. Cake outlet
A n i m p r o v e d t o t a l c o s t o f o w n e r s h i p
Channels Dimensions (mm) Weight Motor
A B C kg kW
1 1785 1830 1028 2068 4
2 1969 1830 1646 3614 5.5
3 2007 1830 2180 4594 7.5
4 2320 1915 2580 5614 11
5 2358 1915 3124 6614 15.0
6 2358 1915 3668 7564 15.0
on-site testing & mobile units
mobile unit
Power and water
usage savings
Chemicals
consumption savings
Saving in O&M
Without thickening
Rotary Press
Centrifuge
Filter Band
Filter Press
Comparative chart of dewatering technologies
for 40 m3
/h treatment capacity.

4. fagoredergarden
www.fagoredergarden.com
Avenida de Navarra 31 - P.O. Box 235
20500 Mondragon (Gipuzkoa) - Spain
Phone: +34 943 08 17 14
E-mail: info@fagoredergarden.com
our customers
Municipal WWTP
Pulp & Paper. Biological Sludge Pulp & Paper. Primary Sludge
INDUSTRIAL WWTP
MUNICIPAL WWTP
DRINKING WATER SEPTAGE
PULP & PAPER FOOD & DRINK BIOMETHANIZATION