Delignification with oxygen reduces active chlorine requirements, environmental impact and water treatment operational costs
Oxygen delignification enhances yield in bleached pulp production and offers relevant operating cost advantages over the use of bleaching agents. Not less important is the environmental benefits it leads to, mainly the minimisation of Adsorbable Organic Halides (AOX). Also, oxygen application leads to lower wastewater treatment oxygen requirements and less color in effluent.
Lower cost
Lower overall bleaching chemical costs.
Less environmental impact
Reduced or eliminated AOX production reducing environmental impact.
Lower BOD/COD
Lower BOD (Biochemical Oxygen Requirement)/COD (Chemical Oxygen Requirement) production and less colour in the effluent.
Reduced wastewater
Reduced wastewater treatment costs (COD and colour removal).
Better yield
Better yield than extended cooking.
Important bleaching
Important bleaching step towards TCF or ECF pulp production and mill closure.
Oxygen in delignification
We can find different types of delignification processes:
-HCOD, High Consistency Oxygen Delignification.
-MCOD, Medium Consistency Oxygen Delignification
(following bullets within MCOD).
Double stage.
Single stage.
Mini.
-Pre, bleaching cellulose HCOD and MCOD
applications are well stablished technologies, adapted
to the concept of a modern plant.
Do you still have questions?
At Nippon Gases we are called “The Gas Professionals” for a reason, and it’s because we’ll be able to solve any doubt.
