Inventory audit notice: TAPPI Press orders will not be processed from August 21–28 during our fiscal year-end inventory audit. Orders placed during this time will ship starting August 31, in the order received. Normal payment processing also resumes August 31.

Thanks for your patience — this helps us serve our members better.

Search

Use the search bar or filters below to find any TAPPI product or publication.

Showing 841–850 of 1,879 results (Duration : 0.01 seconds)

Filters

Industry

Topics

Content Type

Publications

Level of Knowledge

Committees

Collections

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
Kraft recovery boiler operation with splash plate and/or beer can nozzles — a case study, TAPPI Journal Octobr 2021

ABSTRACT: In this work, we study a boiler experiencing upper furnace plugging and availability issues. To improve the situation and increase boiler availability, the liquor spray system was tuned/modified by testing different combinations of splash plate and beer can nozzles. While beer cans are typically used in smaller furnaces, in this work, we considered a furnace with a large floor area for the study. The tested cases included: 1) all splash plate nozzles (original operation), 2) all beer can nozzles, and 3) splash plate nozzles on front and back wall and beer cans nozzles on side walls. We found that operating according to Case 3 resulted in improved overall boiler operation as compared to the original condition of using splash plates only. Additionally, we carried out computational fluid dynamics (CFD) modeling of the three liquor spray cases to better understand the furnace behavior in detail for the tested cases. Model predictions show details of furnace combus-tion characteristics such as temperature, turbulence, gas flow pattern, carryover, and char bed behavior. Simulation using only the beer can nozzles resulted in a clear reduction of carryover. However, at the same time, the predicted lower furnace temperatures close to the char bed were in some locations very low, indicating unstable bed burning. Compared to the first two cases, the model predictions using a mixed setup of splash plate and beer can nozzles showed lower carryover, but without the excessive lowering of gas temperatures close to the char bed.

Journal articles
Open Access
Biofiltration of a-pinene and its application to the treatment of pulp and paper air emissions, TAPPI JOURNAL, August 1998, Vol. 81(8)

Biofiltration of a-pinene and its application to the treatment of pulp and paper air emissions, TAPPI JOURNAL, August 1998, Vol. 81(8)

Journal articles
Open Access
1997 tappi salary survey, TAPPI JOURNAL, August 1998, Vol. 81(8)

1997 tappi salary survey, TAPPI JOURNAL, August 1998, Vol. 81(8)

Journal articles
Open Access
The effects of coated magazines on deinking of newsprint after pulping and flotation, TAPPI JOURNAL, December 1998, Vol. 81(12)

The effects of coated magazines on deinking of newsprint after pulping and flotation, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
Deinking with enzymes: a review, TAPPI JOURNAL, December 1998, Vol. 81(12)

Deinking with enzymes: a review, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
New technology for papermaking: biopulping economics, TAPPI JOURNAL, December 1998, Vol. 81(12)

New technology for papermaking: biopulping economics, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
Quality control of high-consistency refiners, TAPPI JOURNAL, December 1998, Vol. 81(12)

Quality control of high-consistency refiners, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
21st century pulp mills, TAPPI JOURNAL, December 1998, Vol. 81(12)

21st century pulp mills, TAPPI JOURNAL, December 1998, Vol. 81(12)

Journal articles
Open Access
Global warming and climate change: strategic positioning for the pulp and paper industry, TAPPI JOURNAL, December 1998, Vol. 81(12)

Global warming and climate change: strategic positioning for the pulp and paper industry, TAPPI JOURNAL, December 1998, Vol. 81(12)

Inside this Section