Reducing quantities • Health safety

Applications

Reducing sludge production by up to 80%

BIOTHELYS®, thermal hydrolysis combined withbiological treatment

Thermal hydrolysis:> for thickened sludge,> at 150-180°C,> at 8-10 bar,> by steam injection, through the conver-

sion of biogas produced by digestion,> retention time = 30-60 min.

BIOTHELYS®

BIOTHELYS® is a complete solution for reducing sludge quantities.By combining thermal hydrolysis (a THELYS® process) with down-stream biological treatment, BIOTHELYS® can treat all types ofsludge, whether industrial or municipal:> during thermal hydrolysis, a part of the suspended solids is dis-

solved, producing a more readily biodegradable liquid sludge;> downstream, the biodegradable matter is usually treated using

anaerobic digestion.BIOTHELYS® fits perfectly into the wastewater treatment plantand offers the following advantages:> reduction in the quantity of surplus sludge, whilst improving

the quality;> reduction in sludge volume by improving its dewatering charac-

teristics: final dryness of 28-35% after centrifugation and 35-50%after dewatering with a filterpress, without liming;

> control of sludge removal costs;

> reduction of digester size by feeding it with more concentratedsludge (> 10% of dry solids) and reducing the retention time;

> increase in biogas production;

> multiple recycling options for the residual sludge.

Treated water

Hydrolisedsludge

Biogas

Raw water

Clarifier

Thickening

Sludge disposal Dewatering

Thermal hydrolysis

Turbo-digestion

Cogeneration

Aerated tank

Steam conversion

Process diagram

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BIOTHELYS®

References> Saumur, France (2004): 62 000 P.E.* - 1 400 t DS/year.

Using biogas to produce electricity and heattechnical buildings.

*P.E. : Population Equivalent

> Château-Gontier, France (2004): 38 000 P.E.* - 1 000 t DS/year.Using biogas to heat technical buildings.

PerformanceBIOTHELYS® reduces the quantity of sludge produ-ced by up to 80% compared to conventionalmethods. Thermal hydrolysis is used to disinfectand stabilize sludge.

Its combination with digestion ensures that thethermal hydrolysis process is self-sufficient inenergy while still producing “green energy”.

BIOTHELYS® supports multiple recycling optionsthrough composting or thermal oxidation.Disinfection ensures proper management of thehealth concerns, allowing for safe agricultural recycling and nutrient recovery.

- 01/2006 - Photos: VWS

BIOTHELYS® is a flexible solution:

> can be configured to meet your specific requirements: e.g. in combination with aerobictreatment (the plant's aeration tank),

> perfectly suited to plants with wide load swings,

> using the steam produced by an industrial facilitywithin the thermal hydrolysis process,

> effective on all types of sludge: primary, biologicalor mixed, be it of urban or industrial origin, whetherthickened or dewatered,

> able to eliminate plant grease,

> fully automated and secure, integrating perfectlyinto plant operations.

BIOTHELYS® can be combined with the other pro-cesses developed by Veolia Water Solutions &Technologies to create complete sludge treatmentsolutions:

Thermal hydrolysis + DigestionBIOTHELYS®

DewateringDRI-BELT

Hydrothermaloxidation + DewateringATHOS®

Incineration PYROFLUID®

Dewatering on filterpress and thermal drying INOS®

Thermal drying BIOCON®

www.biothelys.com

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