Improve safety in dewatered sludge drying while reducing your energy bill with Evaporis LT process.

1. Evaporis™
LT
LOW TEMPERATURE BIOSOLIDS
SLUDGE DRYING SYSTEM
IMPROVE SAFETY IN DEWATERED
P-PPT-B-009-EN-1107
SLUDGE DRYING WHILE REDUCING
YOUR ENERGY BILL

2. BIOSOLIDS
BIOSOLIDES
CONTENTS
Evaporis™
LT
• Evaporis™ LT on the dryness scale
• Evaporis™ LT Workshop
• Evaporis™ LT: the uses
• A technology in partnership with STC
• Key Points
• Operating Principles
• Evaporis™ LT Advantages
• Case Study: Saint Marcellin, FRANCE
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3. BIOSOLIDS
BIOSOLIDES
Evaporis LT ON THE DRYNESS SCALE
Evaporis™
LT 60 – 90 %
20 – 45 %
4–6%
0,4 %
Dryness
Process Thickening Dehydration Drying
Sludge Volume /
Extracted Water
Volume
Range Name Drainis™ Dehydris™ Evaporis™
Dehydris™ Osmo
Evaporis™ LT
Process Name Drainis™ Turbo Dehydris™ Lime
Evaporis™ LE
Dehydris™ Twist
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4. BIOSOLIDS
BIOSOLIDES
Evaporis LT WORKSHOP
Evaporis™
LT
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5. Evaporis LT – THE USES
Thermal Low-temperature belt dryer
Uses Uses Uses Uses
Cement-making Incineration or Composting Agricultural use
Co-incineration
(Household waste incinerator, thermal
power plant, etc.)
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6. BIOSOLIDS
BIOSOLIDES
STC: AN RECOGNIZED LEADER IN SLUDGE DRYING
Evaporis™
LT Evaporis™ LT uses the dryer of the Spanish company STC
(Sistemas de Transferencia de Calor) located in Castellon,
specializing in the thermal drying of sludge at low
temperatures. A partnership contract has been signed
between STC and Degrémont.
The STC company is 100% owned by AGBAR, which is part
of the Suez Environnement Group.
The STC company, founded in the 1980s, has already carried
out many projects in this field (Besós, Alicante and
Guadalhorce in Spain and Dublin South in Ireland).
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7. BIOSOLIDS
BIOSOLIDES
KEY POINTS
Evaporis™
LT FIELD OF APPLICATION:
• Urban Wastewater sludge:
– Primary or physical-chemical, fresh
– Biological with or without tertiary sludge
– Mixed fresh or digested
• Industrial wastewater sludge: biological sludge
MINIMUM DRYNESS:
• Dryness of the dehydrated sludge to be
dried> 25% dry matter
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8. OPERATING PRINCIPLES:
THE STC DRYER (1/3)
Intake of dewatered
1 sludge
Transport on
3 two dryer belts
2 Sludge extrusion Condensates
into strands 4 extraction
5 Recovery of dried sludge
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9. OPERATING PRINCIPLES:
THE STC DRYER (2/3)
Module O The sludge is then
transported along on
the two dryer belts.
Drying modules
• Dewatered sludge
strands deposit on
the upper belt
Module R
• Extraction of dried
sludge Discharge of
Drying module 1 sludge in process
of drying from
upper belt to the
lower one
Drying module 2
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10. OPERATING PRINCIPLES:
THE STC DRYER (3/3)
Main fans Condenser fans
DESCRIPTION OF THE AIR LOOP: Label1
4
1 Hot air loaded with humidity.
2 3
2 Most of this hot and humid air is sent to
heat exchangers = heating to 80°C 1
3 The other part of the hot and humid air goes
through the condensation exchangers
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(extraction of water from the hot air) = Air
that is less humid and colder.
4 Mixing of 2 air masses = overall this new
air is less humid, but is hot. This hot and less humid air then goes from
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the bottom to the top of the dryer through the
2 belts supporting the bed of sludge strands.
In passing, this hot air takes on humidity =
new cycle
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11. BIOSOLIDS
BIOSOLIDES
Evaporis LT ADVANTAGES (1/2)
Evaporis™
LT ENVIRONMENT:
• Limits greenhouse gas emissions,
• Increased control of odor problem due to the
closed-loop air circulation system, and the
low-temperature dryer.
SAVINGS:
• Decrease in energy consumption due to the
recovery of low-caloric heat used in the process
(cogeneration, heating and air conditioning
systems, residual energy, etc.),
• All-electric function option (heat pump) to make the
most relevant economic choices depending on the
requirements,
• Initial investment depending on the client’s needs
at a given time.
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12. BIOSOLIDS
BIOSOLIDES
Evaporis LT ADVANTAGES (2/2)
Evaporis™
LT EASY OPERATION:
• Quick start-up and automated process,
• Low maintenance,
• Easy access to all equipment.
SAFETY:
• Dryers not concerned by ATEX regulations,
• Dust-free,
• Low operating temperature of dryer,
• Degrémont’s experience with storage (short storage in silos
and longer storage in bins).
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13. CASE STUDY:
SAINT MARCELLIN, FRANCE
CONTEXT: DESIGN:
• Construction of a 50,000 PE WWTP • Sludge treatment line:
• Client: Syndicat Intercommunal à Vocations Thickening, digestion, dehydration and
Multiples (SYVOM) of Saint Marcellin thermal drying with double-fuel
• Commissioning of the plant: 2012 wood and biogas burner
• Dryer capacity: 560 Kg of water
SITUATION: evaporated per hour
The need for a new plant was due to two
points: keeping up with changes to local • Use of energy burner using wood and
regulations (new discharge standards) and biogas produced by sludge digestion
the handling of effluents from neighboring
municipalities.
PROBL
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14. CASE STUDY:
SAINT MARCELLIN, FRANCE
STC Dryer
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