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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
Online monitoring of inorganic cooking chemicals in white liquor by pulse voltammetry, TAPPI JOURNAL August 2010

Online monitoring of inorganic cooking chemicals in white liquor by pulse voltammetry, TAPPI JOURNAL August 2010

Journal articles
Open Access
CFD-Based Modeling of Kraft Char Beds â?¢ Part 2: A Study on the Effects of Droplet Size and Bed Shape on Bed Processes, TAPPI JOURNAL February 2010

CFD-Based Modeling of Kraft Char Beds • Part 2: A Study on the Effects of Droplet Size and Bed Shape on Bed Processes, TAPPI JOURNAL February 2010

Journal articles
Open Access
Study on the Chemical Modification Process of Jute Fiber, TAPPI JOURNAL February 2010

Study on the Chemical Modification Process of Jute Fiber, TAPPI JOURNAL February 2010

Journal articles
Open Access
Editor's Note: PEERS Offers Industry Perspective, TAPPI JOURNAL October 2010

Editor's Note: PEERS Offers Industry Perspective, TAPPI JOURNAL October 2010

Journal articles
Magazine articles
Open Access
Online measurement of bulk, tensile, brightness, and ovendry content of bleached chemithermomechanical pulp using visible and near infrared spectroscopy, TAPPI JOURNAL April 2018

Online measurement of bulk, tensile, brightness, and ovendry content of bleached chemithermomechanical pulp using visible and near infrared spectroscopy, TAPPI JOURNAL April 2018

Journal articles
Magazine articles
Open Access
Enzymatic treated viscose fibers functionalized by chitosan, TAPPI JOURNAL August 2018

Enzymatic treated viscose fibers functionalized by chitosan, TAPPI JOURNAL August 2018

Journal articles
Open Access
Improvement in the Fock test for determining the reactivity of dissolving pulp, TAPPI JOURNAL November 2013

Improvement in the Fock test for determining the reactivity of dissolving pulp, TAPPI JOURNAL November 2013

Journal articles
Open Access
The effect of introducing ozone in elemental chlorine free bleaching of eucalyptus kraft pulp, TAPPI JOURNAL November 2013

The effect of introducing ozone in elemental chlorine free bleaching of eucalyptus kraft pulp, TAPPI JOURNAL November 2013

Journal articles
Open Access
Elemental chlorine-free bleaching of North American hardwood kraft pulps: Evaluation of oxidant-reinforced extraction variables on overall bleaching optimization, TAPPI JOURNAL October 2013

Elemental chlorine-free bleaching of North American hardwood kraft pulps: Evaluation of oxidant-reinforced extraction variables on overall bleaching optimization, TAPPI JOURNAL October 2013

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