Search

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

Showing 31–40 of 1,995 results (Duration : 0.012 seconds)
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
Synthesis of filtrate reducer from biogas residue and its application in drilling fluid, TAPPI Journal March 2020

ABSTRACT: Biogas residues (BR) containing cellulose and lignin are produced with the rapid development of biogas engineering. BR can be used to prepare the filtrate reducer of water-based drilling fluid in oilfields by chemical modification. BR from anaerobically fermenting grain stillage was alkalized and etherified by caustic soda and chloroacetic acid to prepare filtrate reducer, which was named as FBR. The long-chain crystalline polysaccharides were selected as dispersing agents (DA), and the water-soluble silicate was used as the cross-linking agent. After the hot rolling of FBR in saturated saltwater base mud for 16 h at 120°C, the filtration loss was increased from 7.20 mL/30 min before aging to 8.80 mL/30 min after aging. Compared with the commercial filtrate reducers, FBR had better tolerance to high temperature and salt, and lower cost.

Journal articles
Open Access
Assessment of pulp machine white water quality at market kraft pulp mills, TAPPI JOURNAL March 2012

Assessment of pulp machine white water quality at market kraft pulp mills, TAPPI JOURNAL March 2012

Journal articles
Open Access
Scaling risk assessment in a closed circuit recycled board mill by speciation methods, TAPPI JOURNAL May 2012

Scaling risk assessment in a closed circuit recycled board mill by speciation methods, TAPPI JOURNAL May 2012

Journal articles
Magazine articles
Open Access
Recovery boiler back-end heat recovery, TAPPI Journal March 2023

ABSTRACT: Sustainability and efficient use of resources are becoming increasingly important aspects in the operation of all industries. Recently, some biomass-fired boilers have been equipped with increasingly complex condensing back-end heat recovery solutions, sometimes also using heat pumps to upgrade the low-grade heat. In kraft recovery boilers, however, scrubbers are still mainly for gas cleaning, with only simple heat recovery solutions. In this paper, we use process simulation software to study the potential to improve the power generation and energy efficiency by applying condensing back-end heat recovery on a recovery boiler. Different configurations are considered, including heat pumps. Potential streams to serve as heat sinks are considered and evaluated. Lowering the recovery boiler flue gas temperature to approximately 65°C significantly decreases the flue gas losses. The heat can be recovered as hot water, which is used to partially replace low-pressure (LP) steam, making more steam available for the condensing steam turbine portion for increased power generation. The results indicate that in a simple condensing plant, some 1%•4% additional electricity could be generated. In a Nordic mill that provides district heating, even more additional electricity generation, up to 6%, could be achieved. Provided the availability of sufficient low-temperature heat sinks to use the recovered heat, as well as sufficient condensing turbine swallowing capacity to utilize the LP steam, the use of scrubbing and possibly upgrading the heat using heat pumps appears potentially useful.

Journal articles
Open Access
NIRS determination of carbohydrates from hydrothermal-treated rice straw, TAPPI JOURNAL April 2012

NIRS determination of carbohydrates from hydrothermal-treated rice straw, TAPPI JOURNAL April 2012

Journal articles
Open Access
Alkaline xylan extraction of bleached kraft pulp â?¢ effect of extraction time on pulp chemical composition and physical properties, TAPPI JOURNAL April 2012

Alkaline xylan extraction of bleached kraft pulp • effect of extraction time on pulp chemical composition and physical properties, TAPPI JOURNAL April 2012

Journal articles
Open Access
Fiber interaction with a forming fabric, TAPPI JOURNAL August 2012

Fiber interaction with a forming fabric, TAPPI JOURNAL August 2012

Journal articles
Open Access
Conference review: Recycling sessions at TAPPI PEERS, TAPPI JOURNAL February 2012

Conference review: Recycling sessions at TAPPI PEERS, TAPPI JOURNAL February 2012

Journal articles
Open Access
The hyperbolic theory of light scattering, tensile strength, and density in paper, TAPPI JOURNAL November 2011

The hyperbolic theory of light scattering, tensile strength, and density in paper, TAPPI JOURNAL November 2011