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Decreased water usage in a softwood ECF bleaching sequence: full mill simulations
Akzo Nobel Pulp and Performance Chemicals, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
Akzo Nobel Pulp and Performance Chemicals, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
2018 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 17, no 6, p. 353-360Article in journal (Refereed) Published
Abstract [en]

In this study, an elemental chlorine free (ECF) bleach plant with a D0(EOP)D1(EP)D2 sequence was studied with the aim of identifying options for significantly decreasing (fresh) water usage in the bleach plant and decreasing the effluent volume. A base-case simulation model for a softwood kraft market pulp mill was made based on a reference model representing the best available techniques as well as data produced in an extensive  laboratory pulp bleaching study. This model was used to evaluate increased closure within the bleach plant and the recirculation of bleach plant effluent to the brownstock system and their effects on both the bleach plant and the recovery cycle. The results indicate that it is possible to reduce the fresh water consumption from 15 metric tons/a.d. metric ton in the base case to about 2 metric tons/a.d. metric ton, without increasing the carryover of chemical  oxygen demand (COD) to the pulp machine. Nonprocess elements in wood contribute to the levels of metals found in the bleach plant and thus to the risk of  precipitates such as calcium oxalate, barium sulfate, and calcium carbonate. The risk of precipitates forming is a key factor determining the possible degree of closure. In addition, chloride concentration in the black liquor is another important factor that is affected by recirculating bleach plant filtrate to the brownstock washer and by the grade of the sodium hydroxide used in the mill.

Place, publisher, year, edition, pages
2018. Vol. 17, no 6, p. 353-360
Keywords [en]
simulation, elemental chlorine free pulp, bleach plant, water consumption, effluent
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-39733OAI: oai:DiVA.org:ri-39733DiVA, id: diva2:1342363
Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-15Bibliographically approved

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https://imisrise.tappi.org/TAPPI/Products/18/JUN/18JUN353.aspx
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