PROCESS FOR CONTROLLING THE SODIUM AND SULFUR BALANCE IN A PULP MILL

The present invention relates to a process for the controlling the sodium and sulfur levels in a pulp mill, comprising the steps of: a) providing a pulp mill stream comprising sulfide and having a total alkali concentration of at least 2 Molar; b) supplying a portion of the pulp mill stream to a rea...

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Bibliographische Detailangaben
Hauptverfasser: NOORDINK, Michel Paulus Maria, TIMONEN, Olli, VAN ZESSEN, Erik, KOTILAINEN, Ari, WADSBORN, Rickard, BJÖRK, Maria
Format: Patent
Sprache:eng
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Zusammenfassung:The present invention relates to a process for the controlling the sodium and sulfur levels in a pulp mill, comprising the steps of: a) providing a pulp mill stream comprising sulfide and having a total alkali concentration of at least 2 Molar; b) supplying a portion of the pulp mill stream to a reactor comprising sulfide oxidizing bacteria and removing sulfide from the pulp mill streamby subjecting said stream to sulfide oxidizing bacteria in the presence of oxygen, and at a pH in the range 8 to 11, to oxidize the sulfide to elemental sulfur, c) withdrawing from the reactor a treated pulp mill stream comprising sulfur, wherein the portion of the pulp mill stream is mixed with a portion of the sulfide oxidizing bacteria present in the reactor prior to supplying the pulp mill stream to the reactor in step b).