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Journal articles
Magazine articles
Open Access
Control of malodorous gases emission from wet-end white water with hydrogen peroxide, TAPPI Journal October 2021

ABSTRACT: White water is highly recycled in the papermaking process so that its quality is easily deteriorated, thus producing lots of malodorous gases that are extremely harmful to human health and the environment. In this paper, the effect of hydrogen peroxide (H2O2) on the control of malodorous gases released from white water was investigated. The results showed that the released amount of total volatile organic compounds (TVOC) decreased gradually with the increase of H2O2 dosage. Specifically, the TVOC emission reached the minimum as the H2O2 dosage was 1.5 mmol/L, and meanwhile, the hydrogen sulfide (H2S) and ammonia (NH3) were almost completely removed. It was also found that pH had little effect on the release of TVOC as H2O2 was added, but it evidently affect-ed the release of H2S and NH3. When the pH value of the white water was changed to 4.0 or 9.0, the emission of TVOC decreased slightly, while both H2S and NH3 were completely removed in both cases. The ferrous ions (Fe2+) and the copper ions (Cu2+) were found to promote the generation of hydroxyl radicals (HOœ) out of H2O2, enhancing its inhibition on the release of malodorous gases from white water. The Fe2+/H2O2 system and Cu2+/H2O2 system exhibited similar efficiency in inhibiting the TVOC releasing, whereas the Cu2+/H2O2 system showed better perfor-mance in removing H2S and NH3.

Journal articles
Magazine articles
Open Access
Effects of phosphogypsum whiskers modification with calcium stearate and their impacts on properties of bleached softwood paper sheets, TAPPI Journal September 2021

ABSTRACT: By combining the structural properties and characteristics of phosphogypsum whiskers, a preliminary study on the modification of phosphogypsum whiskers and their application in papermaking was carried out. The effects of reaction temperature, reaction time, and reaction concentration on the solubility and retention of modified phosphogypsum whiskers and the effects of phosphogypsum whiskers on the physical properties of paper under different modified conditions were explored. The research results show that, after the phosphogypsum whiskers are modified with calcium stearate, a coating layer will be formed on the surface of the whiskers, which effectively reduces the solubility of the phosphogypsum whiskers. The best modification conditions are: the amount of calcium stearate relative to the absolute dry mass of the phosphogypsum whisker is 2.00%; the modification time is 30 min, and the modification temperature is 60°C. The use of modified phosphogypsum whiskers for paper filling will slightly reduce the whiteness, folding resistance, burst resistance, and tensile strength of the paper, but the tearing degree and retention of the filler will be increased to some extent.

Journal articles
Open Access
Using laser speckle to measure the roughness of paper, TAPPI JOURNAL March 2011

Using laser speckle to measure the roughness of paper, TAPPI JOURNAL March 2011

Journal articles
Open Access
Forming fabric weave-scale variations in paper filler content, TAPPI JOURNAL November 2013

Forming fabric weave-scale variations in paper filler content, TAPPI JOURNAL November 2013

Journal articles
Open Access
Editorial: Innovative oxygen delignification: Conversations with the TAPPI Journal 2012 Best Research Paper Award-winning authors, TAPPI JOURNAL June 2013

Editorial: Innovative oxygen delignification: Conversations with the TAPPI Journal 2012 Best Research Paper Award-winning authors, TAPPI JOURNAL June 2013

Journal articles
Open Access
Changes in solid particle fractions of coating color in low- and high-speed blade coating, TAPPI JOURNAL June 2013

Changes in solid particle fractions of coating color in low- and high-speed blade coating, TAPPI JOURNAL June 2013

Journal articles
Open Access
Editorial: TAPPI Fellows: A distinguished industry group, TAPPI JOURNAL May 2013

Editorial: TAPPI Fellows: A distinguished industry group, TAPPI JOURNAL May 2013

Journal articles
Open Access
Coat weight control in bent blade mode, TAPPI JOURNAL May 2013

Coat weight control in bent blade mode, TAPPI JOURNAL May 2013

Journal articles
Open Access
Evaluation of cut quality of woodfree coated papers, TAPPI JOURNAL September 2013

Evaluation of cut quality of woodfree coated papers, TAPPI JOURNAL September 2013

Journal articles
Open Access
Role of particle size and preflocculation of talc in improvement of paper properties, TAPPI JOURNAL April 2014

Role of particle size and preflocculation of talc in improvement of paper properties, TAPPI JOURNAL April 2014

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