Less environmental impact
Reduced or eliminated AOX production reducing environmental impact
At Nippon Gases we are called “The Gas Professionals” for a reason, and it’s because we’ll be able to solve any doubt.
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.
Come funziona la delignificazione con ossigeno
Il processo di rimozione della lignina utilizza l'ossigeno per ridurre il fabbisogno di cloro attivo nell'impianto di sbiancamento.
Questo processo è un passo importante verso l'assenza di cloro totale (TCF) e di cloro elementare (ECF) nella produzione della pasta di cellulosa.
Lower cost
Lower overall bleaching chemical costs
Lower BOD/COD
Lower BOD/COD production and less colour in the effluent
Important bleaching
Important bleaching step towards TCF or ECF pulp production and mill closure
Reduced wastewater
Reduced wastewater treatment costs (COD and colour removal)
Better yield
Better yield than extended cooking
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
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