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Journal articles
Open Access
Investigation of the factors contributing to malodorous gases emission during secondary fiber reuse, TAPPI Journal June 2026

ABSTRACT: Malodorous gases are commonly produced during secondary fiber reuse, which is harmful to human health and causes environmental pollution. This paper investigated the influence of fiber type and concentration, temperature, and whitewater concentration on the malodorous gases. The results indicated that, in pulp prepared with fresh water, bleached hardwood kraft pulp (LBKP) did not produce malodorous gases after standing for five days. In contrast, the secondary fiber began to release substantial amounts of total volatile organic compounds (TVOC) on the third day and hydrogen sulfide (H2S) and ammonia (NH3) on the sixth day, and black substances began to appear in the pulp, which proved that the microorganisms began to proliferate. With the increase of the secondary fiber concentration, the release amounts of TVOC, H2S, and NH3 gradually rose, along with the black substances in the pulp. With increased temperature, the release of TVOC increased steadily, while the release of H2S and NH3 reached the maximum at about 45°C, and then began to decline. The decrease of the pulp freeness accelerated the generation of the malodorous gases, but the total release amounts of TVOC, H2S, and NH3 were basically the same. With the increase of white water concentration, the release of TVOC, H2S, and NH3 increased rapidly. When the white water/fresh water was 20 mL/80 mL, the slurry changed from pale yellow to aterrimus on the sixth day. Therefore, microorganisms in the secondary fiber caused pulp deterioration, while white water was the main reason for generating a large amount of malodorous gases.

Journal articles
Open Access
The effect of condebelt drying on the structure of fiber bonds, TAPPI JOURNAL, April 1993, Vol. 76(4)

The effect of condebelt drying on the structure of fiber bonds, TAPPI JOURNAL, April 1993, Vol. 76(4)

Journal articles
Open Access
Effects of pulp consistency and mixing intensity on ozone bleaching, TAPPI JOURNAL, April 1993, Vol. 76(4)

Effects of pulp consistency and mixing intensity on ozone bleaching, TAPPI JOURNAL, April 1993, Vol. 76(4)

Journal articles
Open Access
Direct barcode printing on corrugated, TAPPI JOURNAL, April 1993, Vol. 76(4)

Direct barcode printing on corrugated, TAPPI JOURNAL, April 1993, Vol. 76(4)

Journal articles
Open Access
Charge analyses: powerful tools in wet-end optimization, TAPPI JOURNAL, August 1993, Vol. 76(8)

Charge analyses: powerful tools in wet-end optimization, TAPPI JOURNAL, August 1993, Vol. 76(8)

Journal articles
Open Access
Treatment of softwood kraft pulps with peroxymonosulfate before oxygen delignification, TAPPI JOURNAL, August 1993, Vol. 76(8)

Treatment of softwood kraft pulps with peroxymonosulfate before oxygen delignification, TAPPI JOURNAL, August 1993, Vol. 76(8)

Journal articles
Open Access
The effects of alkaline leaching on pulp bleachability and physical properties, TAPPI JOURNAL, December 1993, Vol. 76(12)

The effects of alkaline leaching on pulp bleachability and physical properties, TAPPI JOURNAL, December 1993, Vol. 76(12)

Journal articles
Open Access
Potential of enzymes for wood debarking, TAPPI JOURNAL, February 1993, Vol. 76(2)

Potential of enzymes for wood debarking, TAPPI JOURNAL, February 1993, Vol. 76(2)

Journal articles
Open Access
Biobleaching of softwood kraft pulp with white-rot fungus izu-154, TAPPI JOURNAL, January 1993, Vol. 76(1)

Biobleaching of softwood kraft pulp with white-rot fungus izu-154, TAPPI JOURNAL, January 1993, Vol. 76(1)

Journal articles
Open Access
Formation of acidic sulfates in kraft recovery boilers, TAPPI JOURNAL, July 1993, Vol. 76(7)

Formation of acidic sulfates in kraft recovery boilers, TAPPI JOURNAL, July 1993, Vol. 76(7)

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