DRASTICALLY REDUCE ENERGY COSTS

USING THE HEAT VALUE OF SLUDGE

Thermylis™2S

BIOSOLIDS2-STAGE SLUDGE INCINERATION PROCESS

P-PPT-B-011-EN-1107

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CONTENTS

• The stakes of incineration

• The Thermylis™ 2S process

• Key points of the process

• Functional principle

• Advantages of the Thermylis™ 2S

• References of the Thermylis™ 2S

• Case study: Kielce, POLAND

Thermylis™

2S

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THE STAKES OF INCINERATION

Thermylis™

2S

� Considerably reduces the quantity of sludge to be disposed,

� Eliminates nuisances (odors, storage) and health risks,

� Avoids propagation of pollutants (including endocrine disruptors) contained

in urban wastewater,

� Completely eliminates the problem of sludge

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THE Thermylis 2S PROCESS

Thermylis™

2S

2 S («2 Stages») = 2 steps: drying + incineration

=> Based on the principle of energy recovery

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FIELD OF APPLICATION:

The Thermylis™ 2S is perfectly adapted to sludge with low volatile matter content (<60%) and low calorific value. For this reason, it is suitable for both urban and industrial wastewater sludge:

- Digested sludge,- Tertiary sludge- All weakly dehydrated sludge

MAXIMUM DRYNESS:

•The dryness of dehydrated sludge to be incinerated must be between 17 and 25% dry matter.

KEY POINTS OF THE PROCESS

Thermylis™

2S

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FUNCTIONAL PRINCIPLE:THE STAGES

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Pre-dryer

Fluidized sand bed incinerator

Smoke cooled to be treated

The energy is recovered to supply the pre-dryer for a reduced overall energy balance.

Eliminates the quantity of water in the sludge before incineration

The incineration is done at 850°C continuously for optimal elimination of organic matter and endocrine substances

Exchanger

Recovers the energy in the smoke to heat the pre-dryer

=> 0 fuel addition required

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SAVINGS:• Nearly-zero fuel consumption (fuel, gas) due to use of the

energy produced by the combustion,• Sludge volume reduction reduces transport and landfill costs.

ENVIRONMENT:• Very low environmental impact,• Near-zero primary energy consumption,• Reduction of CO2 emissions ,• Complete elimination of pathogens, germs and hormonal

molecules strengthening community health and safety.

HIGH PERFORMANCE:• Ultimate sludge volume reduction (between 7-10% of the

volume of the dehydrated sludge),• Maximum combustion yield,• Automatic, non-stop operation(24/7).

ADVANTAGES OF THE Thermylis 2S

Thermylis™

2S

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Thermylis2S REFERENCES

Project CapacityCommissioni

ng dateType

of sludgeDryness of sludge

entering unit

Valenton (94), France 1,200,000 PE 2011 Digested sludgeDried sludge fines 28%

Kielce, Poland 300,000 PE 2011 Digested sludge 20%

Gdansk, Poland 800,000 PE 2011 Digested sludge 22%

Shenzhen, China 3,000,000 PE 2013 Mixed sludgeBiological sludge 20%

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CASE STUDY:KIELCE, POLAND

CONTEXT:

• Construction of a WWTP of 300,000 PE

• Client: Wodociagi kieleckie

• Commissioning of the plant: mid-2011

SITUATION:The client needed to bring the plant up to current code compliance and thus overhauled the entire digestion step to increase its capacity. Furthermore, as sludge spreading is a subject of debate in Europe, the client seized the opportunity to include a sludge incineration unit with the digestion.

DEGREMONT provides this incineration unit in a consortium with WTE.

DESIGN:• Sludge treatment line:

Digestion, dehydration by centrifuge, incineration

• Dryness of the sludge entering the

incineration unit: 20%

• Capacity of the Thermylis™ 2S:

740 kg dry matter/day

• 3.2 T of sludge/h to be treated leaving the dehydration