TRS Odor Reduction Using Green Liquor Dregs and Lime Mud in Pressed Pulp Composites

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TRS Odor Reduction Using Green Liquor Dregs and
Lime Mud in Pressed Pulp Composites

• Edgardo Santiago
• Pulping and Bleaching Lab
• Spring 2005

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Presentation Agenda

• Introduction
• Handsheet Process Selection
• Pulp Composite Handsheets
• Reactor Design
• Conclusions and Recommendations

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Introduction

• Total Reduced Sulfur (TRS) Gases
• Hydrogen Sulfide (H2S)
• Methyl Mercaptan (CH3SH)
• Dimethyl Sulfide (CH3SCH3)
• Dimethyl Disulfide (CH3S2CH3)
• EPA Regulated at 5 ppm
• Nauseous Odor

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Introduction (Cont)
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Introduction (Cont)

• Green Liquor Dregs ability to remove TRS
• Testing was done in a fluidized bed
• High pressure drop across the reactor

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Handsheet Process Selection

• Pulp description
• 500-600 freeness
• 30-35 solids
• Unbleached
• Birch hardwood
• Pulp consistency
• 1.3 consistency
• Pressure
• No pressure

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Handsheet Process Selection (cont)

• Reproducibility
• Variance
• Sheets without dregs 0.03
• Sheets with dregs 0.2
• The amount of dregs loaded can be determined by
  comparing it to dregs-free sheets
• Student t-test
• 99.9 confidence level

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Pulp Composite Handsheets

• Handsheets
• Green liquor dregs embedded in pulp
• Dregs size lt0.7 mm and 0.71-1.40 mm
• 80-90 dregs loaded
• Regeneration process determined maximum load
• 50 by weight maximum load

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Reactor Design
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Testbed
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Conclusions Recommendations

• Reproducible process
• 50 by weight dregs handsheet
• No pressure drop across the reactor
• Redesign the mold
• Reevaluate the reactor testbed

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