Separation Technologies for the Industries of the Future (1998) / Chapter Skim
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9 Forest Products Industry
9 Forest Products Industry
Pages 79-86
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From page 79... ...
Fundamental research on the physico-chemical properties of the materials and waste streams of the forest products industry could improve existing processes with significantly less capital investment than would be required for the development of new separation processes. The multicomponent nature of all streams and materials in pulping and papermaking must be kept in mind when concepts for separation are investigated.
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From page 80... ...
These alternatives, which involve adding incremental black liquor processing capacity to existing operations, may ultimately replace the kraft recovery furnace with more efficient technology. A major challenge for some of these alternative
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From page 81... ...
Bleaching Some types of wood pulp undergo bleaching processes to remove additional lignin and brighten the pulp. These bleaching processes produce effluent that can be detrimental to the environment.
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From page 82... ...
If the organics in the effluent could be concentrated, they could be incinerated in the kraft recovery furnace and the remaining effluent could be treated and discharged directly to the environment. Hazardous Air Pollutants The forest products industry would benefit from separation technologies to decrease emissions of methanol and other VOCs from pulping and bleaching
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From page 83... ...
If environmental regulations regarding gaseous and vapor emissions are significantly tightened in the future, hazardous air pollutants will have to be separated from the pulp before it reaches the paper machine to avoid releasing them in dilute form via gaseous or aqueous streams, from which they will be much more difficult to remove. Research is therefore needed on the basic behavior of VOCs in process equipment and on separation methods that can be combined with modifications to existing pulping and bleaching processes (Rezac, et al., 1996~.
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From page 84... ...
Gas separation membranes and absorption or adsorption technologies are promising methods for removing sulfur and other compounds from black liquor gasification effluent gases intended for use in gas turbines. Bleach Effluent Potential technologies for separating organics from bleach effluent streams include recent advances in membrane materials, which may be able to separate and
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From page 85... ...
Filtration, membrane filtration, electrodialysis, and precipitation could be developed for the continuous removal of dissolved organics and inorganics from paper machine process water. Removal of Contaminants from Recycled Fiber Streams Research into flotation mechanisms, surface chemistry, and custom chemistries for specific contaminants may improve the removal efficiency for suspended and dissolved contaminants in the recycled fiber stream.
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From page 86... ...
· separation processes to remove dissolved organics and inorganics continuously from closed-cycle paper machine process water · separation concepts for VOCs that may combine separation processes with modifications of existing pulping and bleaching processes · optimization of the removal efficiency for suspended and dissolved contaminants from the recycled fiber stream · cost-effective capture and disposal or use of organics from lumber drying processes or drying strategies that minimize release or generate concentrated streams
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