Selective removal of sulfur from the kraft pulping process using a biochemical method, TAPPICon25

This paper discusses and introduces a new, more selective removal method for sulfur, applicable for the kraft pulping process. The process is based on a technique previously utilized in removing sulfide from biogas and industrial gases, but not previously utilized within the kraft pulping process. Basically, the technique consists of a bacterial treatment of a small part of the green liquor flow, which produces elemental sulfur as the main product and returning the sodium counterion as sodium(bi)carbonate.

Background information of the technique combined with piloting experiences performed on-site at a softwood kraft pulp mill in Scandinavia during an experimental period of two years is discussed. The aim is that by introducing this technique, a more selective purge of sulfur from the kraft process is obtained, thus paving the way for the introduction of additional biorefinery concepts (e.g. lignine recovery) into the kraft pulp mill system with smaller impact upon the process economy.

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