The document discusses various sludge drying technologies provided by Andritz Separation including drum dryers, fluid bed dryers, paddle dryers, and belt dryers. It provides details on the operating principles, features, and capacities of each system. Examples of installations worldwide are given with specifications and photos of reference drying plants in locations like Greece, Singapore, China, Switzerland, Turkey, Poland and Italy. The document aims to showcase Andritz Separation as a leading global supplier of sludge drying equipment and systems.

1. Drying of Municipal Sludge
FOCUS: Belt Drying
Thermal systems
Paddle Dryer
Fluid Bed Dryer
Belt Dryer
Drum Dryer

2. Andritz Sludge Drying Systems
2
Content
Introduction / Presentation Andritz Separation
Andritz Drying Technologies for Municipal Sludge
Focus on Andritz Belt Drying Systems
Worldwide References
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation

3. 3 Torrefaction of Biomass; CIBC; Price George; June 2012
The ANDRITZ Group
Overview
Company
 ANDRITZ AG, Graz, Austria (Group Headquarters)
 More than 180 production and service sites worldwide
 Employees: approximately 24,800 worldwide (2014)
Key figures 2014
 Order intake: 6,100 MEUR
 Sales: 5,860 MEUR
Products and services
Plants and services for hydropower stations, the pulp and paper industry, solid-
liquid separation in the municipal and industrial sectors, the steel industry, and
the production of animal feed and biomass pellets

4. 4
ANDRITZ SEPARATION
ANDRITZ SEPARATION is a leading global supplier for state-of-the-art separation technologies,
offering a wide range of high quality equipment, systems and services for specific industries.
With more than 150 years of experience in the separation business, we serve our customers
every year with:
Products
 Thickeners
 Flocculant Plants
 Drum and Belt Dryers,
 Paddle Dryers
 Fluid Bed Dryers
 Filter Presses
 Disc Filter
 Drum Filter
 Filter Centrifuges
 Decanters
 Separators
ThickenersCentrifuges and Separators
Filters and Filter Presses Thermal Systems
Screens, Drains, Screw and Belt Presses
 Belt Filters, Belt Presses
 Screens
 Screw Presses
Conveying Systems
 Belt Conveyors
 Chain Conveyors
 Screw Conveyors

5. ANDRITZ SEPARATION
 We have offices in 24 countries serving your local requirements.
5 ANDRITZ SEPARATION | August 2014
Global presence

6. 6
Sludge Drying
Dewatered Sludge Dried Granules
• 18 - 35% DS
• Sticky
• Caloric heating value
< 1 MJ/kg
• biologically active
( digestion processes )
• > 90% DS
• free flowing
• Caloric heating value
- 8 - 11 MJ/kg (digested)
- > 12 MJ/kg ( non-digested )
• pathogen free
• biologically stable
by
from Waste to Product
Transfer of the dewatered sludge
Andritz Sludge Drying Systems
Why Drying??

7. Andritz Sludge Drying Systems
7
4 Different Technologies
Fluid Bed Dryer ( FDS )
Drum Dryer ( DDS )
Belt Dryer ( BDS )
Gouda Paddle Dryer ( GPD )
Contact dryer Convective dryer
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation

8. 8
1. Drying in a triple pass drum containing
three concentric cylinders revolving
around a joint axis.
2. The pre-granulated (backmixed) sludge is
fed into the inner cylinder of the drum
and is conveyed pneumatically by the
stream of hot gases ensuring evenly
dried pasteurised granules.
3. The drum itself has internal flights that lift
the sludge and allow it to fall through the
gas stream resulting in homogeneous
dried granules.
DDS – The principle
Andritz Sludge Drying Systems
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation

9. 9
Capacity up to 14.000 kg/h Water Evaporation (~ 20 t Sludge / h) per Line
Round shaped granulate with defined particle size due to backmixing process!
Convective drying; closed air loop for high thermal efficiency
Directly heated with primary heatsources (biogas, natural gas, diesel, LPG,..)
Andritz References: > 150 dryer worldwide
DDS – The Features
Andritz Sludge Drying Systems
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation

10. 10
• characterised by movement of the granules achieved by passing of the gas
stream through the product layer
• The granules become “floating” ( free floating ) and mixed thoroughly.
FDS - The Principle
Particle in floating motion
Andritz Sludge Drying Systems
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation

11. 11
Direct sludge feeding into highly turbulent fluidized bed
Small footprint of Dryer, Minimum Offgas Quantity
Indirectly heated with heating medium such as thermal oil or steam used in heat-exchanger
Heat recovery from condenser possible
Capacity up to 10.000 kg/h Water Evaporation
FDS – The Features
Andritz Sludge Drying Systems
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation
PICTURES

12.  Contact Dryer (indirect) with heated
trough, shafts and paddles
 Closed process chamber (no air)
 Two counter rotating shafts
 Wedges shaped paddles ensure
perfect local mixing and mechanical fluidization
 No sweep gas / air intake
 Low mechanical speeds – low wear
 Overflow weir to keep filling degree inside machine
12
GPD - The Principle
Andritz Sludge Drying Systems
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation

13. 13
GPD – The Features
Andritz Sludge Drying Systems
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation
Simple drying concept; Minimum Offgas Quantity
Partial Drying possible (65-90% DS)
Indirectly heated with heating medium such as thermal oil or steam used in paddles and shaft
Heat recovery from condenser possible
Capacity up to 6000 kg/h Water Evaporation per line
PICTURES

14. BDS - The Principle
1. Designed as belt conveyor in a casing. The drying gases are flowing through the
product layer distributed evenly on top of the belt.
2. By means of a slow moving belt the drying gases are enabled to
heat up the wet granulate and evaporate the water.
3. The granulate bed acts as a filter media to prevent dust generation
inside the dryer.
Andritz Sludge Drying Systems
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation14

15. 15
BDS – The Features
Andritz Sludge Drying Systems
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation
Low temperature heat-source possible (if cheap waste energy is available)
Stable and easy operation: low speed, low temperatures
Direct or indirect heated (primary energy sources or heating medium thermal oil, hot water,..)
Good product quality due to back-mixing process
Capacity up to 6000 kg/h Water Evaporation per line with standard sizes

16. 16
Natural gas/
Biogas
Sludge Cake
Waste heat
Thermal oil
Steam, etc.
Belt dryer
CondenserCirculation
Air fan
Mixing screw /
Mixer
To exhaust air treatment
Exhaust air fan
Wet sludge silo Belt cooler (Option)
Fresh air fan
Potable water
Final effluent
Waste water
Principle flowsheet of an Andritz BDS
Heat-
exchan
ger
Duct-
Burner
Heat-
exchan
ger
OPTION: Hot Water =
low Temp. heat recovery
Heat-
exchan
ger
Andritz Belt Drying System BDS
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation

17. 17
Backmixing technology
• Formation of granules which result in a high quality and easy to handle product
• Homogenously dry product: drying process starts with a particle which already has a dry
core so DS is homogenouse and e.g. hygenisation can easily be guaranteed
• Excellent circumstances for drying: the mixture fed to the belt consists of numerous
granules therefore huge specific surface which enables an optimum saturation of drying
air, which results in an efficient drying process. Wet sludge is applied in a thin layer on
each particle which makes water vapor “transport” easy and not limiting.
• Flexibility in feed DS-content: fluctuations in cake DS are levelled out by the mixing
process.
• Even distribution of feed on belt: free flowing mixture ensures a even distribution and
best possible use of belt area
• No problem with sticky phase: dewatered sludge cake has problematic properties in the
range of approx. 40-60% DS. This can be overcome with backmixing.
Advantages:
90% DS Partially dry (backmixed)
Andritz Belt Drying System BDS
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation

18. 18
Reference: Psyttalia, Greece
• Water evaporation: 4 x 8.625 kg/h
• Heat source: thermal oil
• Operation per week : 24 h / day, 7 days
• Final product: granulates > 90% DS
• Commissioning: 2007
Andritz Drum Drying System (DDS)

19. 19
Reference: Changi ( Singapore )
Andritz Drum Drying System (DDS )
Technical Data:
• Water evaporation capacity: 5x 11.000 kg/h
• Sludge input: 25 – 28%DS
• Heat source: diesel / bio gas
• Operation: 24 h / day, 7 days per week
• Final product: dried granulate > 90% DS
• Commissioning: 2008

20. 20
Andritz Fluid Bed Drying Plant
• Water evaporation: 3 x 2.830 kg/hr
• Heat source: bio gas
• Operation per week: 24 h / day, 7 days
• Final product: granules 70 - 90% DS
• Commissioning: 2010
Dryer workshop
Dryer building
Reference - Shanghai Bailonggang / China

21. 21
Andritz Fluid Bed Drying Plant
Reference: Bern2 / Switzerland
• Water evaporation: 3,430 kg/h
• Heat source: heating steam
• Operation per week: 24 h/day, 7 days/week
• Final product: granules >90% DS
• Commissioning: 2015
During erection ( sludge silos )
Dryer building

22. References: Ambarli, Istanbul / Turkey
22
ANDRITZ Paddle Drying System – GPD
Technical Data:
• Water evaporation capacity: 6x 3000 kg/h
• Sludge input: digested 25 %DS
• Heat source: flue gas
• Operation: 24 h / day, 7 days per week
• Final product: dried product > 90% DS
• Commissioning: 2012

23. Reference SMAT, Torino / Italy
23
Technical Data:
• Water evaporation capacity: 2x 3500 kg/h
• Heat source: flue gas
• Operation: 24 h / day, 7 days per week
• Final product: dried product > 90% DS
• Commissioning: 2007/2012
ANDRITZ Paddle Drying System – GPD

24. Reference - Hereke, Turkey
Technical Data:
• Water evaporation capacity: 8.150 kg/h
• Sludge input: 250 t/d ( 20%DS )
• Heat source: Waste heat from the cement kiln
• Operation: 24 h / day, 7 days per week
• Final product: dried granulate > 90% DS
• Commissioning: 2009
Andritz Belt Drying Systems

25. Reference – Koszalin, Poland
Andritz Belt Drying Systems
Technical Data:
• Water evaporation capacity: 1500 kg/h
• Input dewatered sludge
• Heat source: natural gas
• Operation: 24 h / day, 5 days per week
• Final product: dried granulate > 90% DS
• Commissioning: 2011

26. Thank you
26
for your attention!
Klaus Trattner, MSc
SEPARATION
ANDRITZ AG
Stattegger Strasse 18
8045 Graz, Austria
Phone: +43 (316) 6902 2990, Fax: +43 (316) 6902 453
www.andritz.com
LEGAL DISCLAIMER
All data, information, statements, photographs, and graphic illustrations contained in this presentation are without any obligation to the publisher
and raise no liabilities to ANDRITZ AG or any affiliated companies, nor shall the contents in this presentation form part of any sales contracts,
which may be concluded between ANDRITZ GROUP companies and purchasers of equipment and/or systems referred to herein.
© ANDRITZ AG 2014. All rights reserved. No part of this copyrighted work may be reproduced, modified or distributed in any form or by any
means, or stored in any database or retrieval system, without the prior written permission of ANDRITZ AG or its affiliates. Any such unauthorized
use for any purpose is a violation of the relevant copyright laws.
LVIV, Sludge Conference; 11 2015; ANDRITZ Separation