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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
Applying pilot coater results to mill practice, TAPPI JOURNAL May 1988 88MAY61

Applying pilot coater results to mill practice, TAPPI JOURNAL May 1988

Journal articles
Open Access
Meeting the needs of the fast-growing, fast-changing pressure-sensitive label industry, TAPPI JOURNAL May 1988 88MAY78

Meeting the needs of the fast-growing, fast-changing pressure-sensitive label industry, TAPPI JOURNAL May 1988

Journal articles
Open Access
A case study of an axial shell edge crack in a Yankee dryer, September 1988, TAPPI Journal 88SEP77

A case study of an axial shell edge crack in a Yankee dryer, TAPPI JOURNAL September 1988

Journal articles
Open Access
Recovery Boiler thermal performance, September 1988, TAPPI Journal 88SEP81

Recovery boiler thermal performance, TAPPI JOURNAL September 1988

Journal articles
Open Access
Wet-end pressure pulsations: case histories, September 1988, TAPPI Journal 88SEP93

Wet-end pressure pulsations: case histories, TAPPI JOURNAL September 1988

Journal articles
Open Access
89APR59

Alkaline papermaking experience at Simpson Plainwell Paper Co., TAPPI JOURNAL April 1989

Journal articles
Open Access
Statistical process control based on function analysis, TAPPI JOURNAL April 1989

Statistical process control based on function analysis, TAPPI JOURNAL April 1989

Journal articles
Open Access
89APR81

Predicting the potential print quality of newsprint, TAPPI JOURNAL April 1989

Journal articles
Open Access
Benefits of SPC in nonmanufacturing areas, TAPPI JOURNAL December 1989 89DEC133

Benefits of SPC in nonmanufacturing areas, TAPPI JOURNAL December 1989

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