CircleToZero is the global ANDRITZ initiative to achieve zero emissions and zero waste while creating sustainable financial growth for our customers. For pulp and paper customers it means eliminating unused industry side streams, turning them into new value-added products and achieving zero waste and zero emission production.


Opportunities for elimination, reduction, and re-use in and outside the mill:

Gaseous side streams

CircleToZero opportunities 

Nitrogen oxides

NOx reduction technologies  

Sulfur dioxide 

SO2 removal technologies 

Odorous gases 

Odorous gas handling and treatment  

Carbon dioxide 

BioCO2 utilization with hydrogen to produce biomethanol 

Solid side streams 

CircleToZero opportunities 

Dregs and Grits 

Source of alkali 

Conversion into fertilizers by removing hazardous components 


Conversion into pellets 

New product development 

Ash and Gasifier bottom ash 

Purification and re-use outside the mill 

Gasifier bottom ash as new raw material 

Lime mud  

Purification and re-use 

Source of alkali 

Liquid side streams 

CircleToZero opportunities 


New strategies to handle filtrates  

Recirculation of purified filtrates  

Reduced fresh water usage that is aiming towards Zero liquid discharge mill 

Raw methanol 

Purification and re-use in and outside the mill 

New revenue generation 


Re-use of condensates 

Fresh water usage reduction  

Sulfate rich streams 

Extraction of sulfate to reduce the fresh water usage  

Crude Sulfate turpentine

Purification and re-use outside the mill 

New revenue generation 

For a better tomorrow. FOR THE CHANGE.


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