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Gunns: getting the facts straight ... : Comments
By Alan Ashbarry, published 14/9/2007'Click and send' campaigns encourage ill-informed comment when it comes to the proposed Gunn's pulp mill in Tasmania.
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The following is from their Q&A re pulp mills
Q14: What about odour from kraft pulp mills – I’ve heard that kraft mills always smell bad?
A14: Many older kraft mills do smell bad. This is because the process of pulping uses a compound of sulphur, called sodium sulphide. In the process of removing the lignin polymer and retaining the strength of the fibres a small amount of the sulphur is converted into malodorous gases, including hydrogen sulphide (rotten egg gas), methyl mercaptan (smells of rotten cabbage) and dimethyl sulphide (smells of burning rubber).
Collectively these gases are called Total Reduced Sulphur, or TRS. In modern kraft mills, these by-products of pulping are collected in sophisticated pollution control systems and burnt to remove the odour.
The only time that these gases escape to the atmosphere are during periods of process upset. In a mill using Accepted Modern Technology odour should only be detected beyond the mill boundary for 2 – 3 days per year at most, during the time the mill is being started up or being shut down for its annual maintenance program.
The emission limit guidelines for odour established by the Tasmanian Government are the most stringent in the world