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Thermal Hydrolysis

Thermal Hydrolysis is the pre-treatment that overcomes the main limitation of existing anaerobic digestions: the hydrolysis step. This results in a more biodegradable organic waste that yields more biogas.

At the same time, it reduces sludge volumes and cuts handling costs. The resulting high-quality biosolids, instead of going to disposal, are suitable for fertilizer usage in food production.

The hydrolyzed, low-viscosity material, enables anaerobic digester loading rates to be doubled, debottlenecking existing plants and resulting in capital expenditure avoidance.

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TH4+, the Thermal Hydrolysis for +, is the technology featuring super-quick heating that allows higher hydrolysis temperatures without harmful secondary reactions. This enables higher pressures and stronger flashes, more severely breaking the organic waste´s cell structure and making it easier to digest.

Its innovative design avoids the use of pumps, with subsequent gains in process reliability and maintenance cost. TH4+ redefines thermal hydrolysis as a continuous process that overcomes the issues associated with batch processing.

Heat-integrated for greater energy efficiency and with a compact design, it is the state-of-the-art technology to help you squeeze more out of your sludge.

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Online Calculator

Input the key figures and parameters of your anaerobic digestion and check how you can benefit from TH4+, the thermal hydrolysis for +


Feed flowrate (kg/h):

Feed total solids (%):

Type of feed:

COD/VS primary sludge (kg COD/kg VS)

COD/VS secondary sludge (kg COD/kg VS)

VS/TS conversion (kg VS/kg TS)

CH4/COD (Nm3 CH4/kg COD)

% COD in sludge (%)

% VS in secondary sludge (%)

CH4 in biogas (w/o TH4+) (%v)

CH4 in biogas (w/ TH4+) (%v)

Primary sludge yield (COD elim./COD total)

Secondary sludge yield (w/o TH4+) (COD elim./COD total)

Secondary sludge yield (w/ TH4+) (COD elim./COD total)

CH4 low heating value (LHV) (kWh/Nm3)

Electric efficiency (%)

Power price (€/kWh)

Sludge disposal cost (€/t)

Biosolid sales price (€/t)

Biosolid dryness (%)

Operating time (h/year)


Without TH4+

With TH4+


Biogas production (Nm3/d)


Power generation (kW)


Biosolids production (kg TS/d)


Biosolids disposal/sale (€/year)

Benefit (€/year)


Legend: COD: Chemical Oxygen Demand / VS: Volatile Solids / TS: Total Solids / CH4: Methane